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Heiko Carstensab14de62007-02-05 21:18:37 +01001/*
2 * arch/s390/kernel/early.c
3 *
4 * Copyright IBM Corp. 2007
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
7 */
8
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +01009#include <linux/compiler.h>
Heiko Carstensab14de62007-02-05 21:18:37 +010010#include <linux/init.h>
11#include <linux/errno.h>
12#include <linux/string.h>
13#include <linux/ctype.h>
14#include <linux/lockdep.h>
15#include <linux/module.h>
16#include <linux/pfn.h>
17#include <linux/uaccess.h>
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020018#include <asm/ebcdic.h>
Michael Holzheu46b05d22007-02-21 10:55:21 +010019#include <asm/ipl.h>
Heiko Carstensab14de62007-02-05 21:18:37 +010020#include <asm/lowcore.h>
21#include <asm/processor.h>
22#include <asm/sections.h>
23#include <asm/setup.h>
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +010024#include <asm/sysinfo.h>
Heiko Carstensab14de62007-02-05 21:18:37 +010025#include <asm/cpcmd.h>
26#include <asm/sclp.h>
Heiko Carstensa8061702008-04-17 07:46:26 +020027#include "entry.h"
Heiko Carstensab14de62007-02-05 21:18:37 +010028
29/*
30 * Create a Kernel NSS if the SAVESYS= parameter is defined
31 */
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020032#define DEFSYS_CMD_SIZE 128
Heiko Carstensab14de62007-02-05 21:18:37 +010033#define SAVESYS_CMD_SIZE 32
34
Heiko Carstensab14de62007-02-05 21:18:37 +010035char kernel_nss_name[NSS_NAME_SIZE + 1];
36
Christian Ehrhardt25097bf2009-04-14 15:36:16 +020037static unsigned long machine_flags;
38
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020039static void __init setup_boot_command_line(void);
40
41
Heiko Carstensab14de62007-02-05 21:18:37 +010042#ifdef CONFIG_SHARED_KERNEL
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020043int __init savesys_ipl_nss(char *cmd, const int cmdlen);
44
45asm(
46 " .section .init.text,\"ax\",@progbits\n"
47 " .align 4\n"
48 " .type savesys_ipl_nss, @function\n"
49 "savesys_ipl_nss:\n"
50#ifdef CONFIG_64BIT
51 " stmg 6,15,48(15)\n"
52 " lgr 14,3\n"
53 " sam31\n"
54 " diag 2,14,0x8\n"
55 " sam64\n"
56 " lgr 2,14\n"
57 " lmg 6,15,48(15)\n"
58#else
59 " stm 6,15,24(15)\n"
60 " lr 14,3\n"
61 " diag 2,14,0x8\n"
62 " lr 2,14\n"
63 " lm 6,15,24(15)\n"
64#endif
65 " br 14\n"
66 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
67
Heiko Carstensab14de62007-02-05 21:18:37 +010068static noinline __init void create_kernel_nss(void)
69{
70 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
71#ifdef CONFIG_BLK_DEV_INITRD
72 unsigned int sinitrd_pfn, einitrd_pfn;
73#endif
74 int response;
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020075 size_t len;
Heiko Carstensab14de62007-02-05 21:18:37 +010076 char *savesys_ptr;
77 char upper_command_line[COMMAND_LINE_SIZE];
78 char defsys_cmd[DEFSYS_CMD_SIZE];
79 char savesys_cmd[SAVESYS_CMD_SIZE];
80
81 /* Do nothing if we are not running under VM */
82 if (!MACHINE_IS_VM)
83 return;
84
85 /* Convert COMMAND_LINE to upper case */
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +020086 for (i = 0; i < strlen(boot_command_line); i++)
87 upper_command_line[i] = toupper(boot_command_line[i]);
Heiko Carstensab14de62007-02-05 21:18:37 +010088
89 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
90
91 if (!savesys_ptr)
92 return;
93
94 savesys_ptr += 8; /* Point to the beginning of the NSS name */
95 for (i = 0; i < NSS_NAME_SIZE; i++) {
96 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
97 break;
98 kernel_nss_name[i] = savesys_ptr[i];
99 }
100
101 stext_pfn = PFN_DOWN(__pa(&_stext));
102 eshared_pfn = PFN_DOWN(__pa(&_eshared));
103 end_pfn = PFN_UP(__pa(&_end));
104 min_size = end_pfn << 2;
105
106 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
107 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
108 eshared_pfn, end_pfn);
109
110#ifdef CONFIG_BLK_DEV_INITRD
111 if (INITRD_START && INITRD_SIZE) {
112 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
113 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
114 min_size = einitrd_pfn << 2;
115 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
116 sinitrd_pfn, einitrd_pfn);
117 }
118#endif
119
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200120 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
121 defsys_cmd, min_size);
Heiko Carstensab14de62007-02-05 21:18:37 +0100122 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
123 kernel_nss_name, kernel_nss_name);
124
125 __cpcmd(defsys_cmd, NULL, 0, &response);
126
Hongjie Yang583b33b2008-03-05 12:37:16 +0100127 if (response != 0) {
128 kernel_nss_name[0] = '\0';
Heiko Carstensab14de62007-02-05 21:18:37 +0100129 return;
Hongjie Yang583b33b2008-03-05 12:37:16 +0100130 }
Heiko Carstensab14de62007-02-05 21:18:37 +0100131
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200132 len = strlen(savesys_cmd);
133 ASCEBC(savesys_cmd, len);
134 response = savesys_ipl_nss(savesys_cmd, len);
Heiko Carstensab14de62007-02-05 21:18:37 +0100135
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200136 /* On success: response is equal to the command size,
137 * max SAVESYS_CMD_SIZE
138 * On error: response contains the numeric portion of cp error message.
139 * for SAVESYS it will be >= 263
140 */
141 if (response > SAVESYS_CMD_SIZE) {
Hongjie Yang583b33b2008-03-05 12:37:16 +0100142 kernel_nss_name[0] = '\0';
Heiko Carstensab14de62007-02-05 21:18:37 +0100143 return;
Hongjie Yang583b33b2008-03-05 12:37:16 +0100144 }
Heiko Carstensab14de62007-02-05 21:18:37 +0100145
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200146 /* re-setup boot command line with new ipl vm parms */
147 ipl_update_parameters();
148 setup_boot_command_line();
149
Heiko Carstensab14de62007-02-05 21:18:37 +0100150 ipl_flags = IPL_NSS_VALID;
151}
152
153#else /* CONFIG_SHARED_KERNEL */
154
155static inline void create_kernel_nss(void) { }
156
157#endif /* CONFIG_SHARED_KERNEL */
158
159/*
160 * Clear bss memory
161 */
162static noinline __init void clear_bss_section(void)
163{
Heiko Carstens229d9c62007-02-21 10:55:29 +0100164 memset(__bss_start, 0, __bss_stop - __bss_start);
Heiko Carstensab14de62007-02-05 21:18:37 +0100165}
166
167/*
168 * Initialize storage key for kernel pages
169 */
170static noinline __init void init_kernel_storage_key(void)
171{
172 unsigned long end_pfn, init_pfn;
173
174 end_pfn = PFN_UP(__pa(&_end));
175
176 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
177 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
178}
179
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +0100180static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
181
Heiko Carstensab14de62007-02-05 21:18:37 +0100182static noinline __init void detect_machine_type(void)
183{
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +0100184 /* No VM information? Looks like LPAR */
185 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
186 return;
187 if (!vmms.count)
188 return;
Heiko Carstensab14de62007-02-05 21:18:37 +0100189
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +0100190 /* Running under KVM? If not we assume z/VM */
191 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
Heiko Carstens2e5061e2008-04-30 13:38:45 +0200192 machine_flags |= MACHINE_FLAG_KVM;
Christian Borntraeger92e6ecf2009-03-26 15:23:58 +0100193 else
194 machine_flags |= MACHINE_FLAG_VM;
Heiko Carstensab14de62007-02-05 21:18:37 +0100195}
196
Heiko Carstensab14de62007-02-05 21:18:37 +0100197static __init void early_pgm_check_handler(void)
198{
199 unsigned long addr;
200 const struct exception_table_entry *fixup;
201
202 addr = S390_lowcore.program_old_psw.addr;
203 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
204 if (!fixup)
205 disabled_wait(0);
206 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
207}
208
209static noinline __init void setup_lowcore_early(void)
210{
211 psw_t psw;
212
213 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
214 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
215 S390_lowcore.external_new_psw = psw;
216 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
217 S390_lowcore.program_new_psw = psw;
218 s390_base_pgm_handler_fn = early_pgm_check_handler;
219}
220
Gerald Schaefer53492b12008-04-30 13:38:46 +0200221static noinline __init void setup_hpage(void)
222{
223#ifndef CONFIG_DEBUG_PAGEALLOC
224 unsigned int facilities;
225
226 facilities = stfl();
227 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
228 return;
229 machine_flags |= MACHINE_FLAG_HPAGE;
230 __ctl_set_bit(0, 23);
231#endif
232}
233
Heiko Carstens2e5061e2008-04-30 13:38:45 +0200234static __init void detect_mvpg(void)
235{
236#ifndef CONFIG_64BIT
237 int rc;
238
239 asm volatile(
240 " la 0,0\n"
241 " mvpg %2,%2\n"
242 "0: la %0,0\n"
243 "1:\n"
244 EX_TABLE(0b,1b)
245 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
246 if (!rc)
247 machine_flags |= MACHINE_FLAG_MVPG;
248#endif
249}
250
251static __init void detect_ieee(void)
252{
253#ifndef CONFIG_64BIT
254 int rc, tmp;
255
256 asm volatile(
257 " efpc %1,0\n"
258 "0: la %0,0\n"
259 "1:\n"
260 EX_TABLE(0b,1b)
261 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
262 if (!rc)
263 machine_flags |= MACHINE_FLAG_IEEE;
264#endif
265}
266
267static __init void detect_csp(void)
268{
269#ifndef CONFIG_64BIT
270 int rc;
271
272 asm volatile(
273 " la 0,0\n"
274 " la 1,0\n"
275 " la 2,4\n"
276 " csp 0,2\n"
277 "0: la %0,0\n"
278 "1:\n"
279 EX_TABLE(0b,1b)
280 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
281 if (!rc)
282 machine_flags |= MACHINE_FLAG_CSP;
283#endif
284}
285
286static __init void detect_diag9c(void)
287{
288 unsigned int cpu_address;
289 int rc;
290
291 cpu_address = stap();
292 asm volatile(
293 " diag %2,0,0x9c\n"
294 "0: la %0,0\n"
295 "1:\n"
296 EX_TABLE(0b,1b)
297 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
298 if (!rc)
299 machine_flags |= MACHINE_FLAG_DIAG9C;
300}
301
302static __init void detect_diag44(void)
303{
304#ifdef CONFIG_64BIT
305 int rc;
306
307 asm volatile(
308 " diag 0,0,0x44\n"
309 "0: la %0,0\n"
310 "1:\n"
311 EX_TABLE(0b,1b)
312 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
313 if (!rc)
314 machine_flags |= MACHINE_FLAG_DIAG44;
315#endif
316}
317
318static __init void detect_machine_facilities(void)
319{
320#ifdef CONFIG_64BIT
321 unsigned int facilities;
322
323 facilities = stfl();
324 if (facilities & (1 << 28))
325 machine_flags |= MACHINE_FLAG_IDTE;
Gerald Schaefer53492b12008-04-30 13:38:46 +0200326 if (facilities & (1 << 23))
327 machine_flags |= MACHINE_FLAG_PFMF;
Heiko Carstens2e5061e2008-04-30 13:38:45 +0200328 if (facilities & (1 << 4))
329 machine_flags |= MACHINE_FLAG_MVCOS;
330#endif
331}
332
Heiko Carstens761cdf62008-07-14 09:58:55 +0200333static __init void rescue_initrd(void)
334{
335#ifdef CONFIG_BLK_DEV_INITRD
336 /*
337 * Move the initrd right behind the bss section in case it starts
338 * within the bss section. So we don't overwrite it when the bss
339 * section gets cleared.
340 */
341 if (!INITRD_START || !INITRD_SIZE)
342 return;
343 if (INITRD_START >= (unsigned long) __bss_stop)
344 return;
345 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
346 INITRD_START = (unsigned long) __bss_stop;
347#endif
348}
349
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200350/* Set up boot command line */
351static void __init setup_boot_command_line(void)
352{
353 char *parm = NULL;
354
355 /* copy arch command line */
356 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200357
358 /* append IPL PARM data to the boot command line */
359 if (MACHINE_IS_VM) {
360 parm = boot_command_line + strlen(boot_command_line);
361 *parm++ = ' ';
362 get_ipl_vmparm(parm);
363 if (parm[0] == '=')
364 memmove(boot_command_line, parm + 1, strlen(parm));
365 }
366}
367
368
Heiko Carstensab14de62007-02-05 21:18:37 +0100369/*
370 * Save ipl parameters, clear bss memory, initialize storage keys
371 * and create a kernel NSS at startup if the SAVESYS= parm is defined
372 */
373void __init startup_init(void)
374{
Heiko Carstensab14de62007-02-05 21:18:37 +0100375 ipl_save_parameters();
Heiko Carstens761cdf62008-07-14 09:58:55 +0200376 rescue_initrd();
Heiko Carstensab14de62007-02-05 21:18:37 +0100377 clear_bss_section();
378 init_kernel_storage_key();
379 lockdep_init();
380 lockdep_off();
Heiko Carstensab14de62007-02-05 21:18:37 +0100381 sort_main_extable();
382 setup_lowcore_early();
Hendrik Bruecknera0443fb2008-07-14 09:59:09 +0200383 detect_machine_type();
384 ipl_update_parameters();
385 setup_boot_command_line();
386 create_kernel_nss();
Heiko Carstens2e5061e2008-04-30 13:38:45 +0200387 detect_mvpg();
388 detect_ieee();
389 detect_csp();
390 detect_diag9c();
391 detect_diag44();
392 detect_machine_facilities();
Gerald Schaefer53492b12008-04-30 13:38:46 +0200393 setup_hpage();
Heiko Carstens83119ad2007-07-10 11:24:10 +0200394 sclp_facilities_detect();
Heiko Carstens23d17422008-07-14 09:59:21 +0200395 detect_memory_layout(memory_chunk);
Christian Ehrhardt25097bf2009-04-14 15:36:16 +0200396 S390_lowcore.machine_flags = machine_flags;
Heiko Carstensab14de62007-02-05 21:18:37 +0100397 lockdep_on();
398}