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review.evervolv.com / android_kernel_htc_msm8960 / bef986502fa398b1785a3979b1aa17cd902d3527 / . / arch / ia64 / kernel / machine_kexec.c
blob: 468233fa2ceede63938c5df28649dc4dd504fb3d [file] [log] [blame]
Zou Nan haia7956112006-12-07 09:51:35 -0800[diff] [blame]1/*
2 * arch/ia64/kernel/machine_kexec.c
3 *
4 * Handle transition of Linux booting another kernel
5 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
6 * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
7 * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
8 *
9 * This source code is licensed under the GNU General Public License,
10 * Version 2. See the file COPYING for more details.
11 */
12
13#include <linux/mm.h>
14#include <linux/kexec.h>
15#include <linux/cpu.h>
16#include <linux/irq.h>
17#include <asm/mmu_context.h>
18#include <asm/setup.h>
19#include <asm/delay.h>
20#include <asm/meminit.h>
21
22typedef void (*relocate_new_kernel_t)(unsigned long, unsigned long,
23 struct ia64_boot_param *, unsigned long);
24
25struct kimage *ia64_kimage;
26
27struct resource efi_memmap_res = {
28 .name = "EFI Memory Map",
29 .start = 0,
30 .end = 0,
31 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
32};
33
34struct resource boot_param_res = {
35 .name = "Boot parameter",
36 .start = 0,
37 .end = 0,
38 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
39};
40
41
42/*
43 * Do what every setup is needed on image and the
44 * reboot code buffer to allow us to avoid allocations
45 * later.
46 */
47int machine_kexec_prepare(struct kimage *image)
48{
49 void *control_code_buffer;
50 const unsigned long *func;
51
52 func = (unsigned long *)&relocate_new_kernel;
53 /* Pre-load control code buffer to minimize work in kexec path */
54 control_code_buffer = page_address(image->control_code_page);
55 memcpy((void *)control_code_buffer, (const void *)func[0],
56 relocate_new_kernel_size);
57 flush_icache_range((unsigned long)control_code_buffer,
58 (unsigned long)control_code_buffer + relocate_new_kernel_size);
59 ia64_kimage = image;
60
61 return 0;
62}
63
64void machine_kexec_cleanup(struct kimage *image)
65{
66}
67
68void machine_shutdown(void)
69{
70 int cpu;
71
72 for_each_online_cpu(cpu) {
73 if (cpu != smp_processor_id())
74 cpu_down(cpu);
75 }
76 kexec_disable_iosapic();
77}
78
79/*
80 * Do not allocate memory (or fail in any way) in machine_kexec().
81 * We are past the point of no return, committed to rebooting now.
82 */
83extern void *efi_get_pal_addr(void);
84static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
85{
86 struct kimage *image = arg;
87 relocate_new_kernel_t rnk;
88 void *pal_addr = efi_get_pal_addr();
89 unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
90 unsigned long vector;
91 int ii;
92
93 if (image->type == KEXEC_TYPE_CRASH) {
94 crash_save_this_cpu();
95 current->thread.ksp = (__u64)info->sw - 16;
96 }
97
98 /* Interrupts aren't acceptable while we reboot */
99 local_irq_disable();
100
101 /* Mask CMC and Performance Monitor interrupts */
102 ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
103 ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
104
105 /* Mask ITV and Local Redirect Registers */
106 ia64_set_itv(1 << 16);
107 ia64_set_lrr0(1 << 16);
108 ia64_set_lrr1(1 << 16);
109
110 /* terminate possible nested in-service interrupts */
111 for (ii = 0; ii < 16; ii++)
112 ia64_eoi();
113
114 /* unmask TPR and clear any pending interrupts */
115 ia64_setreg(_IA64_REG_CR_TPR, 0);
116 ia64_srlz_d();
117 vector = ia64_get_ivr();
118 while (vector != IA64_SPURIOUS_INT_VECTOR) {
119 ia64_eoi();
120 vector = ia64_get_ivr();
121 }
122 platform_kernel_launch_event();
123 rnk = (relocate_new_kernel_t)&code_addr;
124 (*rnk)(image->head, image->start, ia64_boot_param,
125 GRANULEROUNDDOWN((unsigned long) pal_addr));
126 BUG();
127}
128
129void machine_kexec(struct kimage *image)
130{
131 unw_init_running(ia64_machine_kexec, image);
132 for(;;);
133}