Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 1 | #ifndef _KEXEC_H |
| 2 | #define _KEXEC_H |
| 3 | |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 4 | #ifdef CONFIG_X86_32 |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 5 | # define PA_CONTROL_PAGE 0 |
| 6 | # define VA_CONTROL_PAGE 1 |
| 7 | # define PA_PGD 2 |
| 8 | # define VA_PGD 3 |
| 9 | # define PA_PTE_0 4 |
| 10 | # define VA_PTE_0 5 |
| 11 | # define PA_PTE_1 6 |
| 12 | # define VA_PTE_1 7 |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 13 | # define PA_SWAP_PAGE 8 |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 14 | # ifdef CONFIG_X86_PAE |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 15 | # define PA_PMD_0 9 |
| 16 | # define VA_PMD_0 10 |
| 17 | # define PA_PMD_1 11 |
| 18 | # define VA_PMD_1 12 |
| 19 | # define PAGES_NR 13 |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 20 | # else |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 21 | # define PAGES_NR 9 |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 22 | # endif |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 23 | #else |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 24 | # define PA_CONTROL_PAGE 0 |
| 25 | # define VA_CONTROL_PAGE 1 |
| 26 | # define PA_PGD 2 |
| 27 | # define VA_PGD 3 |
| 28 | # define PA_PUD_0 4 |
| 29 | # define VA_PUD_0 5 |
| 30 | # define PA_PMD_0 6 |
| 31 | # define VA_PMD_0 7 |
| 32 | # define PA_PTE_0 8 |
| 33 | # define VA_PTE_0 9 |
| 34 | # define PA_PUD_1 10 |
| 35 | # define VA_PUD_1 11 |
| 36 | # define PA_PMD_1 12 |
| 37 | # define VA_PMD_1 13 |
| 38 | # define PA_PTE_1 14 |
| 39 | # define VA_PTE_1 15 |
| 40 | # define PA_TABLE_PAGE 16 |
| 41 | # define PAGES_NR 17 |
Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 42 | #endif |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 43 | |
Huang Ying | fb45daa | 2008-08-15 00:40:23 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_X86_32 |
| 45 | # define KEXEC_CONTROL_CODE_MAX_SIZE 2048 |
| 46 | #endif |
| 47 | |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 48 | #ifndef __ASSEMBLY__ |
| 49 | |
| 50 | #include <linux/string.h> |
| 51 | |
| 52 | #include <asm/page.h> |
| 53 | #include <asm/ptrace.h> |
| 54 | |
| 55 | /* |
| 56 | * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. |
| 57 | * I.e. Maximum page that is mapped directly into kernel memory, |
| 58 | * and kmap is not required. |
| 59 | * |
| 60 | * So far x86_64 is limited to 40 physical address bits. |
| 61 | */ |
| 62 | #ifdef CONFIG_X86_32 |
| 63 | /* Maximum physical address we can use pages from */ |
| 64 | # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) |
| 65 | /* Maximum address we can reach in physical address mode */ |
| 66 | # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) |
| 67 | /* Maximum address we can use for the control code buffer */ |
| 68 | # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE |
| 69 | |
Huang Ying | 163f687 | 2008-08-15 00:40:22 -0700 | [diff] [blame] | 70 | # define KEXEC_CONTROL_PAGE_SIZE 4096 |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 71 | |
| 72 | /* The native architecture */ |
| 73 | # define KEXEC_ARCH KEXEC_ARCH_386 |
| 74 | |
| 75 | /* We can also handle crash dumps from 64 bit kernel. */ |
| 76 | # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64) |
| 77 | #else |
| 78 | /* Maximum physical address we can use pages from */ |
| 79 | # define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL) |
| 80 | /* Maximum address we can reach in physical address mode */ |
| 81 | # define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL) |
| 82 | /* Maximum address we can use for the control pages */ |
| 83 | # define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL) |
| 84 | |
| 85 | /* Allocate one page for the pdp and the second for the code */ |
Huang Ying | 163f687 | 2008-08-15 00:40:22 -0700 | [diff] [blame] | 86 | # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL) |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 87 | |
| 88 | /* The native architecture */ |
| 89 | # define KEXEC_ARCH KEXEC_ARCH_X86_64 |
| 90 | #endif |
| 91 | |
| 92 | /* |
| 93 | * CPU does not save ss and sp on stack if execution is already |
| 94 | * running in kernel mode at the time of NMI occurrence. This code |
| 95 | * fixes it. |
| 96 | */ |
| 97 | static inline void crash_fixup_ss_esp(struct pt_regs *newregs, |
| 98 | struct pt_regs *oldregs) |
| 99 | { |
| 100 | #ifdef CONFIG_X86_32 |
| 101 | newregs->sp = (unsigned long)&(oldregs->sp); |
Joe Perches | b69a3f9 | 2008-03-23 01:02:32 -0700 | [diff] [blame] | 102 | asm volatile("xorl %%eax, %%eax\n\t" |
| 103 | "movw %%ss, %%ax\n\t" |
| 104 | :"=a"(newregs->ss)); |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 105 | #endif |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * This function is responsible for capturing register states if coming |
| 110 | * via panic otherwise just fix up the ss and sp if coming via kernel |
| 111 | * mode exception. |
| 112 | */ |
| 113 | static inline void crash_setup_regs(struct pt_regs *newregs, |
| 114 | struct pt_regs *oldregs) |
| 115 | { |
| 116 | if (oldregs) { |
| 117 | memcpy(newregs, oldregs, sizeof(*newregs)); |
| 118 | crash_fixup_ss_esp(newregs, oldregs); |
| 119 | } else { |
| 120 | #ifdef CONFIG_X86_32 |
Joe Perches | b69a3f9 | 2008-03-23 01:02:32 -0700 | [diff] [blame] | 121 | asm volatile("movl %%ebx,%0" : "=m"(newregs->bx)); |
| 122 | asm volatile("movl %%ecx,%0" : "=m"(newregs->cx)); |
| 123 | asm volatile("movl %%edx,%0" : "=m"(newregs->dx)); |
| 124 | asm volatile("movl %%esi,%0" : "=m"(newregs->si)); |
| 125 | asm volatile("movl %%edi,%0" : "=m"(newregs->di)); |
| 126 | asm volatile("movl %%ebp,%0" : "=m"(newregs->bp)); |
| 127 | asm volatile("movl %%eax,%0" : "=m"(newregs->ax)); |
| 128 | asm volatile("movl %%esp,%0" : "=m"(newregs->sp)); |
| 129 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); |
| 130 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); |
| 131 | asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds)); |
| 132 | asm volatile("movl %%es, %%eax;" :"=a"(newregs->es)); |
| 133 | asm volatile("pushfl; popl %0" :"=m"(newregs->flags)); |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 134 | #else |
Joe Perches | b69a3f9 | 2008-03-23 01:02:32 -0700 | [diff] [blame] | 135 | asm volatile("movq %%rbx,%0" : "=m"(newregs->bx)); |
| 136 | asm volatile("movq %%rcx,%0" : "=m"(newregs->cx)); |
| 137 | asm volatile("movq %%rdx,%0" : "=m"(newregs->dx)); |
| 138 | asm volatile("movq %%rsi,%0" : "=m"(newregs->si)); |
| 139 | asm volatile("movq %%rdi,%0" : "=m"(newregs->di)); |
| 140 | asm volatile("movq %%rbp,%0" : "=m"(newregs->bp)); |
| 141 | asm volatile("movq %%rax,%0" : "=m"(newregs->ax)); |
| 142 | asm volatile("movq %%rsp,%0" : "=m"(newregs->sp)); |
| 143 | asm volatile("movq %%r8,%0" : "=m"(newregs->r8)); |
| 144 | asm volatile("movq %%r9,%0" : "=m"(newregs->r9)); |
| 145 | asm volatile("movq %%r10,%0" : "=m"(newregs->r10)); |
| 146 | asm volatile("movq %%r11,%0" : "=m"(newregs->r11)); |
| 147 | asm volatile("movq %%r12,%0" : "=m"(newregs->r12)); |
| 148 | asm volatile("movq %%r13,%0" : "=m"(newregs->r13)); |
| 149 | asm volatile("movq %%r14,%0" : "=m"(newregs->r14)); |
| 150 | asm volatile("movq %%r15,%0" : "=m"(newregs->r15)); |
| 151 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); |
| 152 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); |
| 153 | asm volatile("pushfq; popq %0" :"=m"(newregs->flags)); |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 154 | #endif |
| 155 | newregs->ip = (unsigned long)current_text_addr(); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | #ifdef CONFIG_X86_32 |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 160 | asmlinkage unsigned long |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 161 | relocate_kernel(unsigned long indirection_page, |
| 162 | unsigned long control_page, |
| 163 | unsigned long start_address, |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 164 | unsigned int has_pae, |
| 165 | unsigned int preserve_context); |
Harvey Harrison | 3c233d1 | 2008-01-30 13:31:26 +0100 | [diff] [blame] | 166 | #else |
| 167 | NORET_TYPE void |
| 168 | relocate_kernel(unsigned long indirection_page, |
| 169 | unsigned long page_list, |
| 170 | unsigned long start_address) ATTRIB_NORET; |
| 171 | #endif |
| 172 | |
| 173 | #endif /* __ASSEMBLY__ */ |
| 174 | |
| 175 | #endif /* _KEXEC_H */ |