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Ralf Baechlee01402b2005-07-14 15:57:16 +00001/*
2 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
3 *
4 * This program is free software; you can distribute it and/or modify it
5 * under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
Ralf Baechlee01402b2005-07-14 15:57:16 +000016 */
17
18/*
19 * VPE support module
20 *
21 * Provides support for loading a MIPS SP program on VPE1.
Lucas De Marchi25985ed2011-03-30 22:57:33 -030022 * The SP environment is rather simple, no tlb's. It needs to be relocatable
Ralf Baechlee01402b2005-07-14 15:57:16 +000023 * (or partially linked). You should initialise your stack in the startup
24 * code. This loader looks for the symbol __start and sets up
25 * execution to resume from there. The MIPS SDE kit contains suitable examples.
26 *
27 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
28 * i.e cat spapp >/dev/vpe1.
Ralf Baechlee01402b2005-07-14 15:57:16 +000029 */
Ralf Baechlee01402b2005-07-14 15:57:16 +000030#include <linux/kernel.h>
Ralf Baechle27a3bba2007-02-07 13:48:59 +000031#include <linux/device.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000032#include <linux/fs.h>
33#include <linux/init.h>
34#include <asm/uaccess.h>
35#include <linux/slab.h>
36#include <linux/list.h>
37#include <linux/vmalloc.h>
38#include <linux/elf.h>
39#include <linux/seq_file.h>
40#include <linux/syscalls.h>
41#include <linux/moduleloader.h>
42#include <linux/interrupt.h>
43#include <linux/poll.h>
44#include <linux/bootmem.h>
45#include <asm/mipsregs.h>
Ralf Baechle340ee4b2005-08-17 17:44:08 +000046#include <asm/mipsmtregs.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000047#include <asm/cacheflush.h>
Arun Sharma600634972011-07-26 16:09:06 -070048#include <linux/atomic.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000049#include <asm/cpu.h>
Ralf Baechle27a3bba2007-02-07 13:48:59 +000050#include <asm/mips_mt.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000051#include <asm/processor.h>
52#include <asm/system.h>
Ralf Baechle26009902006-04-05 09:45:45 +010053#include <asm/vpe.h>
54#include <asm/kspd.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000055
56typedef void *vpe_handle;
57
Ralf Baechlee01402b2005-07-14 15:57:16 +000058#ifndef ARCH_SHF_SMALL
59#define ARCH_SHF_SMALL 0
60#endif
61
62/* If this is set, the section belongs in the init part of the module */
63#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
64
Ralf Baechle41790e02007-07-27 19:33:18 +010065/*
66 * The number of TCs and VPEs physically available on the core
67 */
68static int hw_tcs, hw_vpes;
Ralf Baechlee01402b2005-07-14 15:57:16 +000069static char module_name[] = "vpe";
Ralf Baechle307bd282005-10-31 23:34:52 +000070static int major;
Ralf Baechle27a3bba2007-02-07 13:48:59 +000071static const int minor = 1; /* fixed for now */
Ralf Baechlee01402b2005-07-14 15:57:16 +000072
Ralf Baechle26009902006-04-05 09:45:45 +010073#ifdef CONFIG_MIPS_APSP_KSPD
Ralf Baechle349c4222009-08-03 12:56:39 +010074static struct kspd_notifications kspd_events;
Ralf Baechle982f6ff2009-09-17 02:25:07 +020075static int kspd_events_reqd;
Ralf Baechle26009902006-04-05 09:45:45 +010076#endif
77
Ralf Baechlee01402b2005-07-14 15:57:16 +000078/* grab the likely amount of memory we will need. */
79#ifdef CONFIG_MIPS_VPE_LOADER_TOM
80#define P_SIZE (2 * 1024 * 1024)
81#else
82/* add an overhead to the max kmalloc size for non-striped symbols/etc */
83#define P_SIZE (256 * 1024)
84#endif
85
Ralf Baechle26009902006-04-05 09:45:45 +010086extern unsigned long physical_memsize;
87
Ralf Baechlee01402b2005-07-14 15:57:16 +000088#define MAX_VPES 16
Ralf Baechle26009902006-04-05 09:45:45 +010089#define VPE_PATH_MAX 256
Ralf Baechlee01402b2005-07-14 15:57:16 +000090
91enum vpe_state {
92 VPE_STATE_UNUSED = 0,
93 VPE_STATE_INUSE,
94 VPE_STATE_RUNNING
95};
96
97enum tc_state {
98 TC_STATE_UNUSED = 0,
99 TC_STATE_INUSE,
100 TC_STATE_RUNNING,
101 TC_STATE_DYNAMIC
102};
103
Ralf Baechle307bd282005-10-31 23:34:52 +0000104struct vpe {
Ralf Baechlee01402b2005-07-14 15:57:16 +0000105 enum vpe_state state;
106
107 /* (device) minor associated with this vpe */
108 int minor;
109
110 /* elfloader stuff */
111 void *load_addr;
Ralf Baechle571e0be2005-12-08 00:32:23 +0000112 unsigned long len;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000113 char *pbuffer;
Ralf Baechle571e0be2005-12-08 00:32:23 +0000114 unsigned long plen;
Ralf Baechle26009902006-04-05 09:45:45 +0100115 unsigned int uid, gid;
116 char cwd[VPE_PATH_MAX];
Ralf Baechlee01402b2005-07-14 15:57:16 +0000117
118 unsigned long __start;
119
120 /* tc's associated with this vpe */
121 struct list_head tc;
122
123 /* The list of vpe's */
124 struct list_head list;
125
126 /* shared symbol address */
127 void *shared_ptr;
Ralf Baechle26009902006-04-05 09:45:45 +0100128
129 /* the list of who wants to know when something major happens */
130 struct list_head notify;
Ralf Baechle41790e02007-07-27 19:33:18 +0100131
132 unsigned int ntcs;
Ralf Baechle307bd282005-10-31 23:34:52 +0000133};
134
135struct tc {
136 enum tc_state state;
137 int index;
138
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100139 struct vpe *pvpe; /* parent VPE */
140 struct list_head tc; /* The list of TC's with this VPE */
141 struct list_head list; /* The global list of tc's */
Ralf Baechle307bd282005-10-31 23:34:52 +0000142};
Ralf Baechlee01402b2005-07-14 15:57:16 +0000143
Ralf Baechle9cfdf6f2007-01-24 19:13:08 +0000144struct {
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100145 spinlock_t vpe_list_lock;
146 struct list_head vpe_list; /* Virtual processing elements */
147 spinlock_t tc_list_lock;
148 struct list_head tc_list; /* Thread contexts */
Ralf Baechle9cfdf6f2007-01-24 19:13:08 +0000149} vpecontrol = {
Thomas Gleixner52bd0802011-01-23 15:17:00 +0000150 .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock),
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100151 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
Thomas Gleixner52bd0802011-01-23 15:17:00 +0000152 .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock),
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100153 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
Ralf Baechle9cfdf6f2007-01-24 19:13:08 +0000154};
Ralf Baechlee01402b2005-07-14 15:57:16 +0000155
156static void release_progmem(void *ptr);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000157
158/* get the vpe associated with this minor */
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100159static struct vpe *get_vpe(int minor)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000160{
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100161 struct vpe *res, *v;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000162
Ralf Baechle26009902006-04-05 09:45:45 +0100163 if (!cpu_has_mipsmt)
164 return NULL;
165
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100166 res = NULL;
167 spin_lock(&vpecontrol.vpe_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000168 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100169 if (v->minor == minor) {
170 res = v;
171 break;
172 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000173 }
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100174 spin_unlock(&vpecontrol.vpe_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000175
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100176 return res;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000177}
178
179/* get the vpe associated with this minor */
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100180static struct tc *get_tc(int index)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000181{
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100182 struct tc *res, *t;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000183
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100184 res = NULL;
185 spin_lock(&vpecontrol.tc_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000186 list_for_each_entry(t, &vpecontrol.tc_list, list) {
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100187 if (t->index == index) {
188 res = t;
189 break;
190 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000191 }
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100192 spin_unlock(&vpecontrol.tc_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000193
Hillf Danton9fbcbd72011-08-04 22:38:31 +0800194 return res;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000195}
196
Ralf Baechlee01402b2005-07-14 15:57:16 +0000197/* allocate a vpe and associate it with this minor (or index) */
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100198static struct vpe *alloc_vpe(int minor)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000199{
200 struct vpe *v;
201
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100202 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000203 return NULL;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000204
Ralf Baechlee01402b2005-07-14 15:57:16 +0000205 INIT_LIST_HEAD(&v->tc);
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100206 spin_lock(&vpecontrol.vpe_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000207 list_add_tail(&v->list, &vpecontrol.vpe_list);
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100208 spin_unlock(&vpecontrol.vpe_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000209
Ralf Baechle26009902006-04-05 09:45:45 +0100210 INIT_LIST_HEAD(&v->notify);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000211 v->minor = minor;
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100212
Ralf Baechlee01402b2005-07-14 15:57:16 +0000213 return v;
214}
215
216/* allocate a tc. At startup only tc0 is running, all other can be halted. */
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100217static struct tc *alloc_tc(int index)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000218{
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100219 struct tc *tc;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000220
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100221 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
222 goto out;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000223
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100224 INIT_LIST_HEAD(&tc->tc);
225 tc->index = index;
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100226
227 spin_lock(&vpecontrol.tc_list_lock);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100228 list_add_tail(&tc->list, &vpecontrol.tc_list);
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100229 spin_unlock(&vpecontrol.tc_list_lock);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000230
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100231out:
232 return tc;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000233}
234
235/* clean up and free everything */
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100236static void release_vpe(struct vpe *v)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000237{
238 list_del(&v->list);
239 if (v->load_addr)
240 release_progmem(v);
241 kfree(v);
242}
243
Ralf Baechle1bbfc202009-09-29 00:52:27 +0100244static void __maybe_unused dump_mtregs(void)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000245{
246 unsigned long val;
247
248 val = read_c0_config3();
249 printk("config3 0x%lx MT %ld\n", val,
250 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
251
Ralf Baechlee01402b2005-07-14 15:57:16 +0000252 val = read_c0_mvpcontrol();
253 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
254 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
255 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
256 (val & MVPCONTROL_EVP));
257
Ralf Baechle26009902006-04-05 09:45:45 +0100258 val = read_c0_mvpconf0();
259 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
260 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
261 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000262}
263
264/* Find some VPE program space */
Ralf Baechle571e0be2005-12-08 00:32:23 +0000265static void *alloc_progmem(unsigned long len)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000266{
Ralf Baechle5408c492008-03-13 15:16:53 +0000267 void *addr;
268
Ralf Baechlee01402b2005-07-14 15:57:16 +0000269#ifdef CONFIG_MIPS_VPE_LOADER_TOM
Ralf Baechle5408c492008-03-13 15:16:53 +0000270 /*
271 * This means you must tell Linux to use less memory than you
272 * physically have, for example by passing a mem= boot argument.
273 */
Ralf Baechle9f2546a2008-04-17 13:42:50 +0100274 addr = pfn_to_kaddr(max_low_pfn);
Ralf Baechle5408c492008-03-13 15:16:53 +0000275 memset(addr, 0, len);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000276#else
Ralf Baechle5408c492008-03-13 15:16:53 +0000277 /* simple grab some mem for now */
278 addr = kzalloc(len, GFP_KERNEL);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000279#endif
Ralf Baechle5408c492008-03-13 15:16:53 +0000280
281 return addr;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000282}
283
284static void release_progmem(void *ptr)
285{
286#ifndef CONFIG_MIPS_VPE_LOADER_TOM
287 kfree(ptr);
288#endif
289}
290
291/* Update size with this section: return offset. */
292static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
293{
294 long ret;
295
296 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
297 *size = ret + sechdr->sh_size;
298 return ret;
299}
300
301/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
302 might -- code, read-only data, read-write data, small data. Tally
303 sizes, and place the offsets into sh_entsize fields: high bit means it
304 belongs in init. */
305static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
306 Elf_Shdr * sechdrs, const char *secstrings)
307{
308 static unsigned long const masks[][2] = {
309 /* NOTE: all executable code must be the first section
310 * in this array; otherwise modify the text_size
311 * finder in the two loops below */
312 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
313 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
314 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
315 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
316 };
317 unsigned int m, i;
318
319 for (i = 0; i < hdr->e_shnum; i++)
320 sechdrs[i].sh_entsize = ~0UL;
321
322 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
323 for (i = 0; i < hdr->e_shnum; ++i) {
324 Elf_Shdr *s = &sechdrs[i];
325
326 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
327 if ((s->sh_flags & masks[m][0]) != masks[m][0]
328 || (s->sh_flags & masks[m][1])
329 || s->sh_entsize != ~0UL)
330 continue;
Raghu Gandhame2a9cf92009-07-10 02:01:32 -0700331 s->sh_entsize =
332 get_offset((unsigned long *)&mod->core_size, s);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000333 }
334
335 if (m == 0)
336 mod->core_text_size = mod->core_size;
337
338 }
339}
340
341
342/* from module-elf32.c, but subverted a little */
343
344struct mips_hi16 {
345 struct mips_hi16 *next;
346 Elf32_Addr *addr;
347 Elf32_Addr value;
348};
349
350static struct mips_hi16 *mips_hi16_list;
351static unsigned int gp_offs, gp_addr;
352
353static int apply_r_mips_none(struct module *me, uint32_t *location,
354 Elf32_Addr v)
355{
356 return 0;
357}
358
359static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
360 Elf32_Addr v)
361{
362 int rel;
363
364 if( !(*location & 0xffff) ) {
365 rel = (int)v - gp_addr;
366 }
367 else {
368 /* .sbss + gp(relative) + offset */
369 /* kludge! */
370 rel = (int)(short)((int)v + gp_offs +
371 (int)(short)(*location & 0xffff) - gp_addr);
372 }
373
374 if( (rel > 32768) || (rel < -32768) ) {
Ralf Baechle26009902006-04-05 09:45:45 +0100375 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
376 "relative address 0x%x out of range of gp register\n",
377 rel);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000378 return -ENOEXEC;
379 }
380
381 *location = (*location & 0xffff0000) | (rel & 0xffff);
382
383 return 0;
384}
385
386static int apply_r_mips_pc16(struct module *me, uint32_t *location,
387 Elf32_Addr v)
388{
389 int rel;
390 rel = (((unsigned int)v - (unsigned int)location));
391 rel >>= 2; // because the offset is in _instructions_ not bytes.
392 rel -= 1; // and one instruction less due to the branch delay slot.
393
394 if( (rel > 32768) || (rel < -32768) ) {
Ralf Baechle26009902006-04-05 09:45:45 +0100395 printk(KERN_DEBUG "VPE loader: "
396 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000397 return -ENOEXEC;
398 }
399
400 *location = (*location & 0xffff0000) | (rel & 0xffff);
401
402 return 0;
403}
404
405static int apply_r_mips_32(struct module *me, uint32_t *location,
406 Elf32_Addr v)
407{
408 *location += v;
409
410 return 0;
411}
412
413static int apply_r_mips_26(struct module *me, uint32_t *location,
414 Elf32_Addr v)
415{
416 if (v % 4) {
Ralf Baechle26009902006-04-05 09:45:45 +0100417 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
418 " unaligned relocation\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +0000419 return -ENOEXEC;
420 }
421
Ralf Baechle307bd282005-10-31 23:34:52 +0000422/*
423 * Not desperately convinced this is a good check of an overflow condition
424 * anyway. But it gets in the way of handling undefined weak symbols which
425 * we want to set to zero.
426 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
427 * printk(KERN_ERR
428 * "module %s: relocation overflow\n",
429 * me->name);
430 * return -ENOEXEC;
431 * }
432 */
Ralf Baechlee01402b2005-07-14 15:57:16 +0000433
434 *location = (*location & ~0x03ffffff) |
435 ((*location + (v >> 2)) & 0x03ffffff);
436 return 0;
437}
438
439static int apply_r_mips_hi16(struct module *me, uint32_t *location,
440 Elf32_Addr v)
441{
442 struct mips_hi16 *n;
443
444 /*
445 * We cannot relocate this one now because we don't know the value of
446 * the carry we need to add. Save the information, and let LO16 do the
447 * actual relocation.
448 */
449 n = kmalloc(sizeof *n, GFP_KERNEL);
450 if (!n)
451 return -ENOMEM;
452
453 n->addr = location;
454 n->value = v;
455 n->next = mips_hi16_list;
456 mips_hi16_list = n;
457
458 return 0;
459}
460
461static int apply_r_mips_lo16(struct module *me, uint32_t *location,
462 Elf32_Addr v)
463{
464 unsigned long insnlo = *location;
465 Elf32_Addr val, vallo;
Ralf Baechle477c4b02009-08-03 12:26:40 +0100466 struct mips_hi16 *l, *next;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000467
468 /* Sign extend the addend we extract from the lo insn. */
469 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
470
471 if (mips_hi16_list != NULL) {
Ralf Baechlee01402b2005-07-14 15:57:16 +0000472
473 l = mips_hi16_list;
474 while (l != NULL) {
Ralf Baechlee01402b2005-07-14 15:57:16 +0000475 unsigned long insn;
476
477 /*
478 * The value for the HI16 had best be the same.
479 */
Ralf Baechle26009902006-04-05 09:45:45 +0100480 if (v != l->value) {
481 printk(KERN_DEBUG "VPE loader: "
Joe Perchesb1e3afa2007-11-19 17:47:54 -0800482 "apply_r_mips_lo16/hi16: \t"
Ralf Baechle26009902006-04-05 09:45:45 +0100483 "inconsistent value information\n");
Ralf Baechle477c4b02009-08-03 12:26:40 +0100484 goto out_free;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000485 }
486
Ralf Baechlee01402b2005-07-14 15:57:16 +0000487 /*
488 * Do the HI16 relocation. Note that we actually don't
489 * need to know anything about the LO16 itself, except
490 * where to find the low 16 bits of the addend needed
491 * by the LO16.
492 */
493 insn = *l->addr;
494 val = ((insn & 0xffff) << 16) + vallo;
495 val += v;
496
497 /*
498 * Account for the sign extension that will happen in
499 * the low bits.
500 */
501 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
502
503 insn = (insn & ~0xffff) | val;
504 *l->addr = insn;
505
506 next = l->next;
507 kfree(l);
508 l = next;
509 }
510
511 mips_hi16_list = NULL;
512 }
513
514 /*
515 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
516 */
517 val = v + vallo;
518 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
519 *location = insnlo;
520
521 return 0;
Ralf Baechle477c4b02009-08-03 12:26:40 +0100522
523out_free:
524 while (l != NULL) {
525 next = l->next;
526 kfree(l);
527 l = next;
528 }
529 mips_hi16_list = NULL;
530
531 return -ENOEXEC;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000532}
533
534static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
535 Elf32_Addr v) = {
536 [R_MIPS_NONE] = apply_r_mips_none,
537 [R_MIPS_32] = apply_r_mips_32,
538 [R_MIPS_26] = apply_r_mips_26,
539 [R_MIPS_HI16] = apply_r_mips_hi16,
540 [R_MIPS_LO16] = apply_r_mips_lo16,
541 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
542 [R_MIPS_PC16] = apply_r_mips_pc16
543};
544
Ralf Baechle26009902006-04-05 09:45:45 +0100545static char *rstrs[] = {
Ralf Baechlee0daad42007-02-05 00:10:11 +0000546 [R_MIPS_NONE] = "MIPS_NONE",
Ralf Baechle26009902006-04-05 09:45:45 +0100547 [R_MIPS_32] = "MIPS_32",
548 [R_MIPS_26] = "MIPS_26",
549 [R_MIPS_HI16] = "MIPS_HI16",
550 [R_MIPS_LO16] = "MIPS_LO16",
551 [R_MIPS_GPREL16] = "MIPS_GPREL16",
552 [R_MIPS_PC16] = "MIPS_PC16"
553};
Ralf Baechlee01402b2005-07-14 15:57:16 +0000554
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100555static int apply_relocations(Elf32_Shdr *sechdrs,
Ralf Baechlee01402b2005-07-14 15:57:16 +0000556 const char *strtab,
557 unsigned int symindex,
558 unsigned int relsec,
559 struct module *me)
560{
561 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
562 Elf32_Sym *sym;
563 uint32_t *location;
564 unsigned int i;
565 Elf32_Addr v;
566 int res;
567
568 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
569 Elf32_Word r_info = rel[i].r_info;
570
571 /* This is where to make the change */
572 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
573 + rel[i].r_offset;
574 /* This is the symbol it is referring to */
575 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
576 + ELF32_R_SYM(r_info);
577
578 if (!sym->st_value) {
579 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
580 me->name, strtab + sym->st_name);
581 /* just print the warning, dont barf */
582 }
583
584 v = sym->st_value;
585
586 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
587 if( res ) {
Ralf Baechle26009902006-04-05 09:45:45 +0100588 char *r = rstrs[ELF32_R_TYPE(r_info)];
589 printk(KERN_WARNING "VPE loader: .text+0x%x "
590 "relocation type %s for symbol \"%s\" failed\n",
591 rel[i].r_offset, r ? r : "UNKNOWN",
592 strtab + sym->st_name);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000593 return res;
Ralf Baechle26009902006-04-05 09:45:45 +0100594 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000595 }
596
597 return 0;
598}
599
Ralf Baechlef18b51c2009-08-03 12:54:35 +0100600static inline void save_gp_address(unsigned int secbase, unsigned int rel)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000601{
602 gp_addr = secbase + rel;
603 gp_offs = gp_addr - (secbase & 0xffff0000);
604}
605/* end module-elf32.c */
606
607
608
609/* Change all symbols so that sh_value encodes the pointer directly. */
Ralf Baechle26009902006-04-05 09:45:45 +0100610static void simplify_symbols(Elf_Shdr * sechdrs,
Ralf Baechlee01402b2005-07-14 15:57:16 +0000611 unsigned int symindex,
612 const char *strtab,
613 const char *secstrings,
614 unsigned int nsecs, struct module *mod)
615{
616 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
617 unsigned long secbase, bssbase = 0;
618 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
Ralf Baechle26009902006-04-05 09:45:45 +0100619 int size;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000620
621 /* find the .bss section for COMMON symbols */
622 for (i = 0; i < nsecs; i++) {
Ralf Baechle26009902006-04-05 09:45:45 +0100623 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
Ralf Baechlee01402b2005-07-14 15:57:16 +0000624 bssbase = sechdrs[i].sh_addr;
Ralf Baechle26009902006-04-05 09:45:45 +0100625 break;
626 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000627 }
628
629 for (i = 1; i < n; i++) {
630 switch (sym[i].st_shndx) {
631 case SHN_COMMON:
Ralf Baechle26009902006-04-05 09:45:45 +0100632 /* Allocate space for the symbol in the .bss section.
633 st_value is currently size.
Ralf Baechlee01402b2005-07-14 15:57:16 +0000634 We want it to have the address of the symbol. */
635
636 size = sym[i].st_value;
637 sym[i].st_value = bssbase;
638
639 bssbase += size;
640 break;
641
642 case SHN_ABS:
643 /* Don't need to do anything */
644 break;
645
646 case SHN_UNDEF:
647 /* ret = -ENOENT; */
648 break;
649
650 case SHN_MIPS_SCOMMON:
Joe Perchesb1e3afa2007-11-19 17:47:54 -0800651 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
Ralf Baechle26009902006-04-05 09:45:45 +0100652 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
653 sym[i].st_shndx);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000654 // .sbss section
655 break;
656
657 default:
658 secbase = sechdrs[sym[i].st_shndx].sh_addr;
659
660 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
661 save_gp_address(secbase, sym[i].st_value);
662 }
663
664 sym[i].st_value += secbase;
665 break;
666 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000667 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000668}
669
670#ifdef DEBUG_ELFLOADER
671static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
672 const char *strtab, struct module *mod)
673{
674 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
675 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
676
677 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
678 for (i = 1; i < n; i++) {
679 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
680 strtab + sym[i].st_name, sym[i].st_value);
681 }
682}
683#endif
684
Ralf Baechlee01402b2005-07-14 15:57:16 +0000685/* We are prepared so configure and start the VPE... */
Ralf Baechlebe6e1432007-02-06 16:53:17 +0000686static int vpe_run(struct vpe * v)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000687{
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100688 unsigned long flags, val, dmt_flag;
Ralf Baechle26009902006-04-05 09:45:45 +0100689 struct vpe_notifications *n;
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100690 unsigned int vpeflags;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000691 struct tc *t;
692
693 /* check we are the Master VPE */
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100694 local_irq_save(flags);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000695 val = read_c0_vpeconf0();
696 if (!(val & VPECONF0_MVP)) {
697 printk(KERN_WARNING
Ralf Baechle26009902006-04-05 09:45:45 +0100698 "VPE loader: only Master VPE's are allowed to configure MT\n");
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100699 local_irq_restore(flags);
700
Ralf Baechlee01402b2005-07-14 15:57:16 +0000701 return -1;
702 }
703
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100704 dmt_flag = dmt();
705 vpeflags = dvpe();
Ralf Baechlee01402b2005-07-14 15:57:16 +0000706
Ralf Baechle26009902006-04-05 09:45:45 +0100707 if (!list_empty(&v->tc)) {
Ralf Baechlee0daad42007-02-05 00:10:11 +0000708 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100709 evpe(vpeflags);
710 emt(dmt_flag);
711 local_irq_restore(flags);
712
713 printk(KERN_WARNING
714 "VPE loader: TC %d is already in use.\n",
715 t->index);
Ralf Baechlee0daad42007-02-05 00:10:11 +0000716 return -ENOEXEC;
717 }
718 } else {
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100719 evpe(vpeflags);
720 emt(dmt_flag);
721 local_irq_restore(flags);
722
723 printk(KERN_WARNING
724 "VPE loader: No TC's associated with VPE %d\n",
Ralf Baechlee0daad42007-02-05 00:10:11 +0000725 v->minor);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100726
Ralf Baechlee0daad42007-02-05 00:10:11 +0000727 return -ENOEXEC;
728 }
Ralf Baechle26009902006-04-05 09:45:45 +0100729
Ralf Baechlee01402b2005-07-14 15:57:16 +0000730 /* Put MVPE's into 'configuration state' */
Ralf Baechle340ee4b2005-08-17 17:44:08 +0000731 set_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000732
Ralf Baechlee01402b2005-07-14 15:57:16 +0000733 settc(t->index);
734
Ralf Baechlee01402b2005-07-14 15:57:16 +0000735 /* should check it is halted, and not activated */
736 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100737 evpe(vpeflags);
738 emt(dmt_flag);
739 local_irq_restore(flags);
740
741 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
Ralf Baechlee01402b2005-07-14 15:57:16 +0000742 t->index);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100743
Ralf Baechlee01402b2005-07-14 15:57:16 +0000744 return -ENOEXEC;
745 }
746
747 /* Write the address we want it to start running from in the TCPC register. */
748 write_tc_c0_tcrestart((unsigned long)v->__start);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000749 write_tc_c0_tccontext((unsigned long)0);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100750
Ralf Baechle26009902006-04-05 09:45:45 +0100751 /*
752 * Mark the TC as activated, not interrupt exempt and not dynamically
753 * allocatable
754 */
Ralf Baechlee01402b2005-07-14 15:57:16 +0000755 val = read_tc_c0_tcstatus();
756 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
757 write_tc_c0_tcstatus(val);
758
759 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
760
Ralf Baechlee01402b2005-07-14 15:57:16 +0000761 /*
762 * The sde-kit passes 'memsize' to __start in $a3, so set something
Ralf Baechle26009902006-04-05 09:45:45 +0100763 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
Ralf Baechlee01402b2005-07-14 15:57:16 +0000764 * DFLT_HEAP_SIZE when you compile your program
765 */
Ralf Baechle41790e02007-07-27 19:33:18 +0100766 mttgpr(6, v->ntcs);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100767 mttgpr(7, physical_memsize);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000768
Ralf Baechle26009902006-04-05 09:45:45 +0100769 /* set up VPE1 */
770 /*
771 * bind the TC to VPE 1 as late as possible so we only have the final
772 * VPE registers to set up, and so an EJTAG probe can trigger on it
773 */
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100774 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
Ralf Baechle26009902006-04-05 09:45:45 +0100775
Elizabeth Oldhama94d7022006-08-17 12:39:21 +0100776 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
777
778 back_to_back_c0_hazard();
779
Ralf Baechlee0daad42007-02-05 00:10:11 +0000780 /* Set up the XTC bit in vpeconf0 to point at our tc */
781 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
782 | (t->index << VPECONF0_XTC_SHIFT));
Ralf Baechle26009902006-04-05 09:45:45 +0100783
Elizabeth Oldhama94d7022006-08-17 12:39:21 +0100784 back_to_back_c0_hazard();
785
Ralf Baechlee0daad42007-02-05 00:10:11 +0000786 /* enable this VPE */
787 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000788
789 /* clear out any left overs from a previous program */
Ralf Baechle26009902006-04-05 09:45:45 +0100790 write_vpe_c0_status(0);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000791 write_vpe_c0_cause(0);
792
793 /* take system out of configuration state */
Ralf Baechle340ee4b2005-08-17 17:44:08 +0000794 clear_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000795
Kevin D. Kissellb6183362008-04-16 15:32:22 +0200796 /*
797 * SMTC/SMVP kernels manage VPE enable independently,
798 * but uniprocessor kernels need to turn it on, even
799 * if that wasn't the pre-dvpe() state.
800 */
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100801#ifdef CONFIG_SMP
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100802 evpe(vpeflags);
Kevin D. Kissellb6183362008-04-16 15:32:22 +0200803#else
804 evpe(EVPE_ENABLE);
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100805#endif
806 emt(dmt_flag);
807 local_irq_restore(flags);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000808
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100809 list_for_each_entry(n, &v->notify, list)
810 n->start(minor);
Ralf Baechle26009902006-04-05 09:45:45 +0100811
Ralf Baechlee01402b2005-07-14 15:57:16 +0000812 return 0;
813}
814
Ralf Baechle26009902006-04-05 09:45:45 +0100815static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
Ralf Baechlee01402b2005-07-14 15:57:16 +0000816 unsigned int symindex, const char *strtab,
817 struct module *mod)
818{
819 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
820 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
821
822 for (i = 1; i < n; i++) {
823 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
824 v->__start = sym[i].st_value;
825 }
826
827 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
828 v->shared_ptr = (void *)sym[i].st_value;
829 }
830 }
831
Ralf Baechle26009902006-04-05 09:45:45 +0100832 if ( (v->__start == 0) || (v->shared_ptr == NULL))
833 return -1;
834
Ralf Baechlee01402b2005-07-14 15:57:16 +0000835 return 0;
836}
837
Ralf Baechle307bd282005-10-31 23:34:52 +0000838/*
Ralf Baechle26009902006-04-05 09:45:45 +0100839 * Allocates a VPE with some program code space(the load address), copies the
840 * contents of the program (p)buffer performing relocatations/etc, free's it
841 * when finished.
842 */
Ralf Baechlebe6e1432007-02-06 16:53:17 +0000843static int vpe_elfload(struct vpe * v)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000844{
845 Elf_Ehdr *hdr;
846 Elf_Shdr *sechdrs;
847 long err = 0;
848 char *secstrings, *strtab = NULL;
Ralf Baechle26009902006-04-05 09:45:45 +0100849 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000850 struct module mod; // so we can re-use the relocations code
851
852 memset(&mod, 0, sizeof(struct module));
Ralf Baechle26009902006-04-05 09:45:45 +0100853 strcpy(mod.name, "VPE loader");
Ralf Baechlee01402b2005-07-14 15:57:16 +0000854
855 hdr = (Elf_Ehdr *) v->pbuffer;
856 len = v->plen;
857
858 /* Sanity checks against insmoding binaries or wrong arch,
859 weird elf version */
Cyrill Gorcunovd303f4a2008-05-04 17:50:02 +0100860 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
Ralf Baechle26009902006-04-05 09:45:45 +0100861 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
862 || !elf_check_arch(hdr)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000863 || hdr->e_shentsize != sizeof(*sechdrs)) {
864 printk(KERN_WARNING
Ralf Baechle26009902006-04-05 09:45:45 +0100865 "VPE loader: program wrong arch or weird elf version\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +0000866
867 return -ENOEXEC;
868 }
869
Ralf Baechle26009902006-04-05 09:45:45 +0100870 if (hdr->e_type == ET_REL)
871 relocate = 1;
872
Ralf Baechlee01402b2005-07-14 15:57:16 +0000873 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
Ralf Baechle26009902006-04-05 09:45:45 +0100874 printk(KERN_ERR "VPE loader: program length %u truncated\n",
875 len);
876
Ralf Baechlee01402b2005-07-14 15:57:16 +0000877 return -ENOEXEC;
878 }
879
880 /* Convenience variables */
881 sechdrs = (void *)hdr + hdr->e_shoff;
882 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
883 sechdrs[0].sh_addr = 0;
884
885 /* And these should exist, but gcc whinges if we don't init them */
886 symindex = strindex = 0;
887
Ralf Baechle26009902006-04-05 09:45:45 +0100888 if (relocate) {
889 for (i = 1; i < hdr->e_shnum; i++) {
890 if (sechdrs[i].sh_type != SHT_NOBITS
891 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
892 printk(KERN_ERR "VPE program length %u truncated\n",
893 len);
894 return -ENOEXEC;
895 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000896
Ralf Baechle26009902006-04-05 09:45:45 +0100897 /* Mark all sections sh_addr with their address in the
898 temporary image. */
899 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
900
901 /* Internal symbols and strings. */
902 if (sechdrs[i].sh_type == SHT_SYMTAB) {
903 symindex = i;
904 strindex = sechdrs[i].sh_link;
905 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
906 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000907 }
Ralf Baechle26009902006-04-05 09:45:45 +0100908 layout_sections(&mod, hdr, sechdrs, secstrings);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000909 }
910
Ralf Baechlee01402b2005-07-14 15:57:16 +0000911 v->load_addr = alloc_progmem(mod.core_size);
Ralf Baechle5408c492008-03-13 15:16:53 +0000912 if (!v->load_addr)
913 return -ENOMEM;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000914
Ralf Baechle5408c492008-03-13 15:16:53 +0000915 pr_info("VPE loader: loading to %p\n", v->load_addr);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000916
Ralf Baechle26009902006-04-05 09:45:45 +0100917 if (relocate) {
918 for (i = 0; i < hdr->e_shnum; i++) {
919 void *dest;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000920
Ralf Baechle26009902006-04-05 09:45:45 +0100921 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
922 continue;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000923
Ralf Baechle26009902006-04-05 09:45:45 +0100924 dest = v->load_addr + sechdrs[i].sh_entsize;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000925
Ralf Baechle26009902006-04-05 09:45:45 +0100926 if (sechdrs[i].sh_type != SHT_NOBITS)
927 memcpy(dest, (void *)sechdrs[i].sh_addr,
928 sechdrs[i].sh_size);
929 /* Update sh_addr to point to copy in image. */
930 sechdrs[i].sh_addr = (unsigned long)dest;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000931
Ralf Baechle26009902006-04-05 09:45:45 +0100932 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
933 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
934 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000935
Ralf Baechle26009902006-04-05 09:45:45 +0100936 /* Fix up syms, so that st_value is a pointer to location. */
937 simplify_symbols(sechdrs, symindex, strtab, secstrings,
938 hdr->e_shnum, &mod);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000939
Ralf Baechle26009902006-04-05 09:45:45 +0100940 /* Now do relocations. */
941 for (i = 1; i < hdr->e_shnum; i++) {
942 const char *strtab = (char *)sechdrs[strindex].sh_addr;
943 unsigned int info = sechdrs[i].sh_info;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000944
Ralf Baechle26009902006-04-05 09:45:45 +0100945 /* Not a valid relocation section? */
946 if (info >= hdr->e_shnum)
947 continue;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000948
Ralf Baechle26009902006-04-05 09:45:45 +0100949 /* Don't bother with non-allocated sections */
950 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
951 continue;
952
953 if (sechdrs[i].sh_type == SHT_REL)
954 err = apply_relocations(sechdrs, strtab, symindex, i,
955 &mod);
956 else if (sechdrs[i].sh_type == SHT_RELA)
957 err = apply_relocate_add(sechdrs, strtab, symindex, i,
958 &mod);
959 if (err < 0)
960 return err;
961
962 }
963 } else {
Ralf Baechlebdf5d422007-10-10 13:33:03 +0100964 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
Ralf Baechle26009902006-04-05 09:45:45 +0100965
Ralf Baechlebdf5d422007-10-10 13:33:03 +0100966 for (i = 0; i < hdr->e_phnum; i++) {
Kevin D. Kissellb6183362008-04-16 15:32:22 +0200967 if (phdr->p_type == PT_LOAD) {
968 memcpy((void *)phdr->p_paddr,
969 (char *)hdr + phdr->p_offset,
970 phdr->p_filesz);
971 memset((void *)phdr->p_paddr + phdr->p_filesz,
972 0, phdr->p_memsz - phdr->p_filesz);
973 }
974 phdr++;
Ralf Baechlebdf5d422007-10-10 13:33:03 +0100975 }
976
977 for (i = 0; i < hdr->e_shnum; i++) {
Ralf Baechle26009902006-04-05 09:45:45 +0100978 /* Internal symbols and strings. */
979 if (sechdrs[i].sh_type == SHT_SYMTAB) {
980 symindex = i;
981 strindex = sechdrs[i].sh_link;
982 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
983
984 /* mark the symtab's address for when we try to find the
985 magic symbols */
986 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
987 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000988 }
989 }
990
991 /* make sure it's physically written out */
992 flush_icache_range((unsigned long)v->load_addr,
993 (unsigned long)v->load_addr + v->len);
994
995 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
Ralf Baechle26009902006-04-05 09:45:45 +0100996 if (v->__start == 0) {
997 printk(KERN_WARNING "VPE loader: program does not contain "
998 "a __start symbol\n");
999 return -ENOEXEC;
1000 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001001
Ralf Baechle26009902006-04-05 09:45:45 +01001002 if (v->shared_ptr == NULL)
1003 printk(KERN_WARNING "VPE loader: "
1004 "program does not contain vpe_shared symbol.\n"
1005 " Unable to use AMVP (AP/SP) facilities.\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +00001006 }
1007
1008 printk(" elf loaded\n");
Ralf Baechle26009902006-04-05 09:45:45 +01001009 return 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001010}
1011
Ralf Baechle26009902006-04-05 09:45:45 +01001012static void cleanup_tc(struct tc *tc)
1013{
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001014 unsigned long flags;
1015 unsigned int mtflags, vpflags;
Ralf Baechle26009902006-04-05 09:45:45 +01001016 int tmp;
1017
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001018 local_irq_save(flags);
1019 mtflags = dmt();
1020 vpflags = dvpe();
Ralf Baechle26009902006-04-05 09:45:45 +01001021 /* Put MVPE's into 'configuration state' */
1022 set_c0_mvpcontrol(MVPCONTROL_VPC);
1023
1024 settc(tc->index);
1025 tmp = read_tc_c0_tcstatus();
1026
1027 /* mark not allocated and not dynamically allocatable */
1028 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1029 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1030 write_tc_c0_tcstatus(tmp);
1031
1032 write_tc_c0_tchalt(TCHALT_H);
Nigel Stephens7c3a6222007-11-08 13:25:51 +00001033 mips_ihb();
Ralf Baechle26009902006-04-05 09:45:45 +01001034
1035 /* bind it to anything other than VPE1 */
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001036// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
Ralf Baechle26009902006-04-05 09:45:45 +01001037
1038 clear_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001039 evpe(vpflags);
1040 emt(mtflags);
1041 local_irq_restore(flags);
Ralf Baechle26009902006-04-05 09:45:45 +01001042}
1043
1044static int getcwd(char *buff, int size)
1045{
1046 mm_segment_t old_fs;
1047 int ret;
1048
1049 old_fs = get_fs();
1050 set_fs(KERNEL_DS);
1051
Ralf Baechle21a151d2007-10-11 23:46:15 +01001052 ret = sys_getcwd(buff, size);
Ralf Baechle26009902006-04-05 09:45:45 +01001053
1054 set_fs(old_fs);
1055
1056 return ret;
1057}
1058
1059/* checks VPE is unused and gets ready to load program */
Ralf Baechlee01402b2005-07-14 15:57:16 +00001060static int vpe_open(struct inode *inode, struct file *filp)
1061{
Ralf Baechlec4c40182007-02-23 13:40:45 +00001062 enum vpe_state state;
Ralf Baechle26009902006-04-05 09:45:45 +01001063 struct vpe_notifications *not;
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001064 struct vpe *v;
Ralf Baechle1bbfc202009-09-29 00:52:27 +01001065 int ret;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001066
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001067 if (minor != iminor(inode)) {
1068 /* assume only 1 device at the moment. */
Ralf Baechle1bbfc202009-09-29 00:52:27 +01001069 pr_warning("VPE loader: only vpe1 is supported\n");
1070
1071 return -ENODEV;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001072 }
1073
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001074 if ((v = get_vpe(tclimit)) == NULL) {
Ralf Baechle1bbfc202009-09-29 00:52:27 +01001075 pr_warning("VPE loader: unable to get vpe\n");
1076
1077 return -ENODEV;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001078 }
1079
Ralf Baechlec4c40182007-02-23 13:40:45 +00001080 state = xchg(&v->state, VPE_STATE_INUSE);
1081 if (state != VPE_STATE_UNUSED) {
Ralf Baechle26009902006-04-05 09:45:45 +01001082 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1083
Ralf Baechle26009902006-04-05 09:45:45 +01001084 list_for_each_entry(not, &v->notify, list) {
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001085 not->stop(tclimit);
Ralf Baechle26009902006-04-05 09:45:45 +01001086 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001087
1088 release_progmem(v->load_addr);
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001089 cleanup_tc(get_tc(tclimit));
Ralf Baechlee01402b2005-07-14 15:57:16 +00001090 }
1091
Ralf Baechlee01402b2005-07-14 15:57:16 +00001092 /* this of-course trashes what was there before... */
1093 v->pbuffer = vmalloc(P_SIZE);
Jesper Juhl863abad2010-10-30 18:37:16 +02001094 if (!v->pbuffer) {
1095 pr_warning("VPE loader: unable to allocate memory\n");
1096 return -ENOMEM;
1097 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001098 v->plen = P_SIZE;
1099 v->load_addr = NULL;
1100 v->len = 0;
1101
David Howellsd76b0d92008-11-14 10:39:25 +11001102 v->uid = filp->f_cred->fsuid;
1103 v->gid = filp->f_cred->fsgid;
Ralf Baechle26009902006-04-05 09:45:45 +01001104
1105#ifdef CONFIG_MIPS_APSP_KSPD
1106 /* get kspd to tell us when a syscall_exit happens */
1107 if (!kspd_events_reqd) {
1108 kspd_notify(&kspd_events);
1109 kspd_events_reqd++;
1110 }
1111#endif
1112
1113 v->cwd[0] = 0;
1114 ret = getcwd(v->cwd, VPE_PATH_MAX);
1115 if (ret < 0)
1116 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1117
1118 v->shared_ptr = NULL;
1119 v->__start = 0;
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001120
Ralf Baechlee01402b2005-07-14 15:57:16 +00001121 return 0;
1122}
1123
1124static int vpe_release(struct inode *inode, struct file *filp)
1125{
Ralf Baechle307bd282005-10-31 23:34:52 +00001126 struct vpe *v;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001127 Elf_Ehdr *hdr;
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001128 int ret = 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001129
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001130 v = get_vpe(tclimit);
1131 if (v == NULL)
Ralf Baechlee01402b2005-07-14 15:57:16 +00001132 return -ENODEV;
1133
Ralf Baechlee01402b2005-07-14 15:57:16 +00001134 hdr = (Elf_Ehdr *) v->pbuffer;
Cyrill Gorcunovd303f4a2008-05-04 17:50:02 +01001135 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001136 if (vpe_elfload(v) >= 0) {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001137 vpe_run(v);
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001138 } else {
Ralf Baechle26009902006-04-05 09:45:45 +01001139 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +00001140 ret = -ENOEXEC;
1141 }
1142 } else {
Ralf Baechle26009902006-04-05 09:45:45 +01001143 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +00001144 ret = -ENOEXEC;
1145 }
1146
Ralf Baechle26009902006-04-05 09:45:45 +01001147 /* It's good to be able to run the SP and if it chokes have a look at
1148 the /dev/rt?. But if we reset the pointer to the shared struct we
Nick Andrew8ebcfc82008-12-05 11:36:54 +11001149 lose what has happened. So perhaps if garbage is sent to the vpe
Ralf Baechle26009902006-04-05 09:45:45 +01001150 device, use it as a trigger for the reset. Hopefully a nice
1151 executable will be along shortly. */
1152 if (ret < 0)
1153 v->shared_ptr = NULL;
1154
Jesper Juhl863abad2010-10-30 18:37:16 +02001155 vfree(v->pbuffer);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001156 v->plen = 0;
Jesper Juhl863abad2010-10-30 18:37:16 +02001157
Ralf Baechlee01402b2005-07-14 15:57:16 +00001158 return ret;
1159}
1160
1161static ssize_t vpe_write(struct file *file, const char __user * buffer,
1162 size_t count, loff_t * ppos)
1163{
Ralf Baechlee01402b2005-07-14 15:57:16 +00001164 size_t ret = count;
Ralf Baechle307bd282005-10-31 23:34:52 +00001165 struct vpe *v;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001166
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001167 if (iminor(file->f_path.dentry->d_inode) != minor)
1168 return -ENODEV;
1169
1170 v = get_vpe(tclimit);
1171 if (v == NULL)
Ralf Baechlee01402b2005-07-14 15:57:16 +00001172 return -ENODEV;
1173
Ralf Baechlee01402b2005-07-14 15:57:16 +00001174 if ((count + v->len) > v->plen) {
1175 printk(KERN_WARNING
Ralf Baechle26009902006-04-05 09:45:45 +01001176 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
Ralf Baechlee01402b2005-07-14 15:57:16 +00001177 return -ENOMEM;
1178 }
1179
1180 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
Ralf Baechle26009902006-04-05 09:45:45 +01001181 if (!count)
Ralf Baechlee01402b2005-07-14 15:57:16 +00001182 return -EFAULT;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001183
1184 v->len += count;
1185 return ret;
1186}
1187
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -08001188static const struct file_operations vpe_fops = {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001189 .owner = THIS_MODULE,
1190 .open = vpe_open,
1191 .release = vpe_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001192 .write = vpe_write,
1193 .llseek = noop_llseek,
Ralf Baechlee01402b2005-07-14 15:57:16 +00001194};
1195
1196/* module wrapper entry points */
1197/* give me a vpe */
1198vpe_handle vpe_alloc(void)
1199{
1200 int i;
1201 struct vpe *v;
1202
1203 /* find a vpe */
1204 for (i = 1; i < MAX_VPES; i++) {
1205 if ((v = get_vpe(i)) != NULL) {
1206 v->state = VPE_STATE_INUSE;
1207 return v;
1208 }
1209 }
1210 return NULL;
1211}
1212
1213EXPORT_SYMBOL(vpe_alloc);
1214
1215/* start running from here */
1216int vpe_start(vpe_handle vpe, unsigned long start)
1217{
1218 struct vpe *v = vpe;
1219
1220 v->__start = start;
1221 return vpe_run(v);
1222}
1223
1224EXPORT_SYMBOL(vpe_start);
1225
1226/* halt it for now */
1227int vpe_stop(vpe_handle vpe)
1228{
1229 struct vpe *v = vpe;
1230 struct tc *t;
1231 unsigned int evpe_flags;
1232
1233 evpe_flags = dvpe();
1234
1235 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1236
1237 settc(t->index);
1238 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1239 }
1240
1241 evpe(evpe_flags);
1242
1243 return 0;
1244}
1245
1246EXPORT_SYMBOL(vpe_stop);
1247
1248/* I've done with it thank you */
1249int vpe_free(vpe_handle vpe)
1250{
1251 struct vpe *v = vpe;
1252 struct tc *t;
1253 unsigned int evpe_flags;
1254
1255 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1256 return -ENOEXEC;
1257 }
1258
1259 evpe_flags = dvpe();
1260
1261 /* Put MVPE's into 'configuration state' */
Ralf Baechle340ee4b2005-08-17 17:44:08 +00001262 set_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001263
1264 settc(t->index);
1265 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1266
Nigel Stephens7c3a6222007-11-08 13:25:51 +00001267 /* halt the TC */
Ralf Baechlee01402b2005-07-14 15:57:16 +00001268 write_tc_c0_tchalt(TCHALT_H);
Nigel Stephens7c3a6222007-11-08 13:25:51 +00001269 mips_ihb();
1270
1271 /* mark the TC unallocated */
1272 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001273
1274 v->state = VPE_STATE_UNUSED;
1275
Ralf Baechle340ee4b2005-08-17 17:44:08 +00001276 clear_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001277 evpe(evpe_flags);
1278
1279 return 0;
1280}
1281
1282EXPORT_SYMBOL(vpe_free);
1283
1284void *vpe_get_shared(int index)
1285{
1286 struct vpe *v;
1287
Ralf Baechle26009902006-04-05 09:45:45 +01001288 if ((v = get_vpe(index)) == NULL)
Ralf Baechlee01402b2005-07-14 15:57:16 +00001289 return NULL;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001290
1291 return v->shared_ptr;
1292}
1293
1294EXPORT_SYMBOL(vpe_get_shared);
1295
Ralf Baechle26009902006-04-05 09:45:45 +01001296int vpe_getuid(int index)
1297{
1298 struct vpe *v;
1299
1300 if ((v = get_vpe(index)) == NULL)
1301 return -1;
1302
1303 return v->uid;
1304}
1305
1306EXPORT_SYMBOL(vpe_getuid);
1307
1308int vpe_getgid(int index)
1309{
1310 struct vpe *v;
1311
1312 if ((v = get_vpe(index)) == NULL)
1313 return -1;
1314
1315 return v->gid;
1316}
1317
1318EXPORT_SYMBOL(vpe_getgid);
1319
1320int vpe_notify(int index, struct vpe_notifications *notify)
1321{
1322 struct vpe *v;
1323
1324 if ((v = get_vpe(index)) == NULL)
1325 return -1;
1326
1327 list_add(&notify->list, &v->notify);
1328 return 0;
1329}
1330
1331EXPORT_SYMBOL(vpe_notify);
1332
1333char *vpe_getcwd(int index)
1334{
1335 struct vpe *v;
1336
1337 if ((v = get_vpe(index)) == NULL)
1338 return NULL;
1339
1340 return v->cwd;
1341}
1342
1343EXPORT_SYMBOL(vpe_getcwd);
1344
1345#ifdef CONFIG_MIPS_APSP_KSPD
1346static void kspd_sp_exit( int sp_id)
1347{
1348 cleanup_tc(get_tc(sp_id));
1349}
1350#endif
1351
Kay Sievers736fad12007-10-15 13:42:35 +02001352static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1353 const char *buf, size_t len)
Ralf Baechle0f5d0df2007-07-27 19:37:51 +01001354{
1355 struct vpe *vpe = get_vpe(tclimit);
1356 struct vpe_notifications *not;
1357
1358 list_for_each_entry(not, &vpe->notify, list) {
1359 not->stop(tclimit);
1360 }
1361
1362 release_progmem(vpe->load_addr);
1363 cleanup_tc(get_tc(tclimit));
1364 vpe_stop(vpe);
1365 vpe_free(vpe);
1366
1367 return len;
1368}
1369
Kay Sievers736fad12007-10-15 13:42:35 +02001370static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1371 char *buf)
Ralf Baechle41790e02007-07-27 19:33:18 +01001372{
1373 struct vpe *vpe = get_vpe(tclimit);
1374
1375 return sprintf(buf, "%d\n", vpe->ntcs);
1376}
1377
Kay Sievers736fad12007-10-15 13:42:35 +02001378static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1379 const char *buf, size_t len)
Ralf Baechle41790e02007-07-27 19:33:18 +01001380{
1381 struct vpe *vpe = get_vpe(tclimit);
1382 unsigned long new;
1383 char *endp;
1384
1385 new = simple_strtoul(buf, &endp, 0);
1386 if (endp == buf)
1387 goto out_einval;
1388
1389 if (new == 0 || new > (hw_tcs - tclimit))
1390 goto out_einval;
1391
1392 vpe->ntcs = new;
1393
1394 return len;
1395
1396out_einval:
Joe Perches52a7a272009-06-28 09:26:09 -07001397 return -EINVAL;
Ralf Baechle41790e02007-07-27 19:33:18 +01001398}
1399
Kay Sievers736fad12007-10-15 13:42:35 +02001400static struct device_attribute vpe_class_attributes[] = {
Ralf Baechle0f5d0df2007-07-27 19:37:51 +01001401 __ATTR(kill, S_IWUSR, NULL, store_kill),
Ralf Baechle41790e02007-07-27 19:33:18 +01001402 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1403 {}
1404};
1405
Kay Sievers736fad12007-10-15 13:42:35 +02001406static void vpe_device_release(struct device *cd)
Ralf Baechle41790e02007-07-27 19:33:18 +01001407{
1408 kfree(cd);
1409}
1410
1411struct class vpe_class = {
1412 .name = "vpe",
1413 .owner = THIS_MODULE,
Kay Sievers736fad12007-10-15 13:42:35 +02001414 .dev_release = vpe_device_release,
1415 .dev_attrs = vpe_class_attributes,
Ralf Baechle41790e02007-07-27 19:33:18 +01001416};
1417
Kay Sievers736fad12007-10-15 13:42:35 +02001418struct device vpe_device;
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001419
Ralf Baechlee01402b2005-07-14 15:57:16 +00001420static int __init vpe_module_init(void)
1421{
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001422 unsigned int mtflags, vpflags;
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001423 unsigned long flags, val;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001424 struct vpe *v = NULL;
1425 struct tc *t;
Ralf Baechle41790e02007-07-27 19:33:18 +01001426 int tc, err;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001427
1428 if (!cpu_has_mipsmt) {
1429 printk("VPE loader: not a MIPS MT capable processor\n");
1430 return -ENODEV;
1431 }
1432
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001433 if (vpelimit == 0) {
1434 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1435 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1436 "kernel argument\n");
1437
1438 return -ENODEV;
1439 }
1440
1441 if (tclimit == 0) {
1442 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1443 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1444 "kernel argument\n");
1445
1446 return -ENODEV;
1447 }
1448
Alexey Dobriyan682e8522006-01-10 00:09:16 +03001449 major = register_chrdev(0, module_name, &vpe_fops);
1450 if (major < 0) {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001451 printk("VPE loader: unable to register character device\n");
Ralf Baechle307bd282005-10-31 23:34:52 +00001452 return major;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001453 }
1454
Ralf Baechle41790e02007-07-27 19:33:18 +01001455 err = class_register(&vpe_class);
1456 if (err) {
1457 printk(KERN_ERR "vpe_class registration failed\n");
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001458 goto out_chrdev;
1459 }
Ralf Baechle41790e02007-07-27 19:33:18 +01001460
Kay Sievers736fad12007-10-15 13:42:35 +02001461 device_initialize(&vpe_device);
Ralf Baechle41790e02007-07-27 19:33:18 +01001462 vpe_device.class = &vpe_class,
1463 vpe_device.parent = NULL,
Kay Sievers1bb5beb2009-01-06 10:44:38 -08001464 dev_set_name(&vpe_device, "vpe1");
Ralf Baechle41790e02007-07-27 19:33:18 +01001465 vpe_device.devt = MKDEV(major, minor);
Kay Sievers736fad12007-10-15 13:42:35 +02001466 err = device_add(&vpe_device);
Ralf Baechle41790e02007-07-27 19:33:18 +01001467 if (err) {
1468 printk(KERN_ERR "Adding vpe_device failed\n");
1469 goto out_class;
1470 }
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001471
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001472 local_irq_save(flags);
1473 mtflags = dmt();
1474 vpflags = dvpe();
Ralf Baechlee01402b2005-07-14 15:57:16 +00001475
1476 /* Put MVPE's into 'configuration state' */
Ralf Baechle340ee4b2005-08-17 17:44:08 +00001477 set_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001478
1479 /* dump_mtregs(); */
1480
Ralf Baechlee01402b2005-07-14 15:57:16 +00001481 val = read_c0_mvpconf0();
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001482 hw_tcs = (val & MVPCONF0_PTC) + 1;
1483 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1484
1485 for (tc = tclimit; tc < hw_tcs; tc++) {
1486 /*
1487 * Must re-enable multithreading temporarily or in case we
1488 * reschedule send IPIs or similar we might hang.
1489 */
1490 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1491 evpe(vpflags);
1492 emt(mtflags);
1493 local_irq_restore(flags);
1494 t = alloc_tc(tc);
1495 if (!t) {
1496 err = -ENOMEM;
1497 goto out;
1498 }
1499
1500 local_irq_save(flags);
1501 mtflags = dmt();
1502 vpflags = dvpe();
1503 set_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001504
1505 /* VPE's */
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001506 if (tc < hw_tcs) {
1507 settc(tc);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001508
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001509 if ((v = alloc_vpe(tc)) == NULL) {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001510 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001511
1512 goto out_reenable;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001513 }
1514
Ralf Baechle41790e02007-07-27 19:33:18 +01001515 v->ntcs = hw_tcs - tclimit;
1516
Ralf Baechle26009902006-04-05 09:45:45 +01001517 /* add the tc to the list of this vpe's tc's. */
1518 list_add(&t->tc, &v->tc);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001519
1520 /* deactivate all but vpe0 */
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001521 if (tc >= tclimit) {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001522 unsigned long tmp = read_vpe_c0_vpeconf0();
1523
1524 tmp &= ~VPECONF0_VPA;
1525
1526 /* master VPE */
1527 tmp |= VPECONF0_MVP;
1528 write_vpe_c0_vpeconf0(tmp);
1529 }
1530
1531 /* disable multi-threading with TC's */
1532 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1533
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001534 if (tc >= vpelimit) {
Ralf Baechle26009902006-04-05 09:45:45 +01001535 /*
1536 * Set config to be the same as vpe0,
1537 * particularly kseg0 coherency alg
1538 */
Ralf Baechlee01402b2005-07-14 15:57:16 +00001539 write_vpe_c0_config(read_c0_config());
1540 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001541 }
1542
1543 /* TC's */
1544 t->pvpe = v; /* set the parent vpe */
1545
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001546 if (tc >= tclimit) {
Ralf Baechlee01402b2005-07-14 15:57:16 +00001547 unsigned long tmp;
1548
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001549 settc(tc);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001550
Ralf Baechle26009902006-04-05 09:45:45 +01001551 /* Any TC that is bound to VPE0 gets left as is - in case
1552 we are running SMTC on VPE0. A TC that is bound to any
1553 other VPE gets bound to VPE0, ideally I'd like to make
1554 it homeless but it doesn't appear to let me bind a TC
1555 to a non-existent VPE. Which is perfectly reasonable.
1556
1557 The (un)bound state is visible to an EJTAG probe so may
1558 notify GDB...
1559 */
1560
1561 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1562 /* tc is bound >vpe0 */
1563 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1564
1565 t->pvpe = get_vpe(0); /* set the parent vpe */
1566 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001567
Nigel Stephens7c3a6222007-11-08 13:25:51 +00001568 /* halt the TC */
1569 write_tc_c0_tchalt(TCHALT_H);
1570 mips_ihb();
1571
Ralf Baechlee01402b2005-07-14 15:57:16 +00001572 tmp = read_tc_c0_tcstatus();
1573
Ralf Baechle26009902006-04-05 09:45:45 +01001574 /* mark not activated and not dynamically allocatable */
Ralf Baechlee01402b2005-07-14 15:57:16 +00001575 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1576 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1577 write_tc_c0_tcstatus(tmp);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001578 }
1579 }
1580
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001581out_reenable:
Ralf Baechlee01402b2005-07-14 15:57:16 +00001582 /* release config state */
Ralf Baechle340ee4b2005-08-17 17:44:08 +00001583 clear_c0_mvpcontrol(MVPCONTROL_VPC);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001584
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001585 evpe(vpflags);
1586 emt(mtflags);
1587 local_irq_restore(flags);
1588
Ralf Baechle26009902006-04-05 09:45:45 +01001589#ifdef CONFIG_MIPS_APSP_KSPD
1590 kspd_events.kspd_sp_exit = kspd_sp_exit;
1591#endif
Ralf Baechlee01402b2005-07-14 15:57:16 +00001592 return 0;
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001593
Ralf Baechle41790e02007-07-27 19:33:18 +01001594out_class:
1595 class_unregister(&vpe_class);
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001596out_chrdev:
1597 unregister_chrdev(major, module_name);
1598
Ralf Baechle07cc0c92007-07-27 19:31:10 +01001599out:
Ralf Baechle27a3bba2007-02-07 13:48:59 +00001600 return err;
Ralf Baechlee01402b2005-07-14 15:57:16 +00001601}
1602
1603static void __exit vpe_module_exit(void)
1604{
1605 struct vpe *v, *n;
1606
Kay Sievers736fad12007-10-15 13:42:35 +02001607 device_del(&vpe_device);
Ralf Baechlee01402b2005-07-14 15:57:16 +00001608 unregister_chrdev(major, module_name);
Ralf Baechle1bbfc202009-09-29 00:52:27 +01001609
1610 /* No locking needed here */
1611 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1612 if (v->state != VPE_STATE_UNUSED)
1613 release_vpe(v);
1614 }
Ralf Baechlee01402b2005-07-14 15:57:16 +00001615}
1616
1617module_init(vpe_module_init);
1618module_exit(vpe_module_exit);
1619MODULE_DESCRIPTION("MIPS VPE Loader");
Ralf Baechle26009902006-04-05 09:45:45 +01001620MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
Ralf Baechlee01402b2005-07-14 15:57:16 +00001621MODULE_LICENSE("GPL");