1#ifndef _ASM_X86_KEXEC_H 2#define _ASM_X86_KEXEC_H 3 4#ifdef CONFIG_X86_32 5# define PA_CONTROL_PAGE 0 6# define VA_CONTROL_PAGE 1 7# define PA_PGD 2 8# define PA_SWAP_PAGE 3 9# define PAGES_NR 4 10#else 11# define PA_CONTROL_PAGE 0 12# define VA_CONTROL_PAGE 1 13# define PA_TABLE_PAGE 2 14# define PA_SWAP_PAGE 3 15# define PAGES_NR 4 16#endif 17 18# define KEXEC_CONTROL_CODE_MAX_SIZE 2048 19 20#ifndef __ASSEMBLY__ 21 22#include <linux/string.h> 23 24#include <asm/page.h> 25#include <asm/ptrace.h> 26 27/* 28 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. 29 * I.e. Maximum page that is mapped directly into kernel memory, 30 * and kmap is not required. 31 * 32 * So far x86_64 is limited to 40 physical address bits. 33 */ 34#ifdef CONFIG_X86_32 35/* Maximum physical address we can use pages from */ 36# define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) 37/* Maximum address we can reach in physical address mode */ 38# define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) 39/* Maximum address we can use for the control code buffer */ 40# define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE 41 42# define KEXEC_CONTROL_PAGE_SIZE 4096 43 44/* The native architecture */ 45# define KEXEC_ARCH KEXEC_ARCH_386 46 47/* We can also handle crash dumps from 64 bit kernel. */ 48# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64) 49#else 50/* Maximum physical address we can use pages from */ 51# define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL) 52/* Maximum address we can reach in physical address mode */ 53# define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL) 54/* Maximum address we can use for the control pages */ 55# define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL) 56 57/* Allocate one page for the pdp and the second for the code */ 58# define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL) 59 60/* The native architecture */ 61# define KEXEC_ARCH KEXEC_ARCH_X86_64 62#endif 63 64/* 65 * CPU does not save ss and sp on stack if execution is already 66 * running in kernel mode at the time of NMI occurrence. This code 67 * fixes it. 68 */ 69static inline void crash_fixup_ss_esp(struct pt_regs *newregs, 70 struct pt_regs *oldregs) 71{ 72#ifdef CONFIG_X86_32 73 newregs->sp = (unsigned long)&(oldregs->sp); 74 asm volatile("xorl %%eax, %%eax\n\t" 75 "movw %%ss, %%ax\n\t" 76 :"=a"(newregs->ss)); 77#endif 78} 79 80/* 81 * This function is responsible for capturing register states if coming 82 * via panic otherwise just fix up the ss and sp if coming via kernel 83 * mode exception. 84 */ 85static inline void crash_setup_regs(struct pt_regs *newregs, 86 struct pt_regs *oldregs) 87{ 88 if (oldregs) { 89 memcpy(newregs, oldregs, sizeof(*newregs)); 90 crash_fixup_ss_esp(newregs, oldregs); 91 } else { 92#ifdef CONFIG_X86_32 93 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx)); 94 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx)); 95 asm volatile("movl %%edx,%0" : "=m"(newregs->dx)); 96 asm volatile("movl %%esi,%0" : "=m"(newregs->si)); 97 asm volatile("movl %%edi,%0" : "=m"(newregs->di)); 98 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp)); 99 asm volatile("movl %%eax,%0" : "=m"(newregs->ax)); 100 asm volatile("movl %%esp,%0" : "=m"(newregs->sp)); 101 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); 102 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); 103 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds)); 104 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es)); 105 asm volatile("pushfl; popl %0" :"=m"(newregs->flags)); 106#else 107 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx)); 108 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx)); 109 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx)); 110 asm volatile("movq %%rsi,%0" : "=m"(newregs->si)); 111 asm volatile("movq %%rdi,%0" : "=m"(newregs->di)); 112 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp)); 113 asm volatile("movq %%rax,%0" : "=m"(newregs->ax)); 114 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp)); 115 asm volatile("movq %%r8,%0" : "=m"(newregs->r8)); 116 asm volatile("movq %%r9,%0" : "=m"(newregs->r9)); 117 asm volatile("movq %%r10,%0" : "=m"(newregs->r10)); 118 asm volatile("movq %%r11,%0" : "=m"(newregs->r11)); 119 asm volatile("movq %%r12,%0" : "=m"(newregs->r12)); 120 asm volatile("movq %%r13,%0" : "=m"(newregs->r13)); 121 asm volatile("movq %%r14,%0" : "=m"(newregs->r14)); 122 asm volatile("movq %%r15,%0" : "=m"(newregs->r15)); 123 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); 124 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); 125 asm volatile("pushfq; popq %0" :"=m"(newregs->flags)); 126#endif 127 newregs->ip = (unsigned long)current_text_addr(); 128 } 129} 130 131#ifdef CONFIG_X86_32 132asmlinkage unsigned long 133relocate_kernel(unsigned long indirection_page, 134 unsigned long control_page, 135 unsigned long start_address, 136 unsigned int has_pae, 137 unsigned int preserve_context); 138#else 139unsigned long 140relocate_kernel(unsigned long indirection_page, 141 unsigned long page_list, 142 unsigned long start_address, 143 unsigned int preserve_context); 144#endif 145 146#define ARCH_HAS_KIMAGE_ARCH 147 148#ifdef CONFIG_X86_32 149struct kimage_arch { 150 pgd_t *pgd; 151#ifdef CONFIG_X86_PAE 152 pmd_t *pmd0; 153 pmd_t *pmd1; 154#endif 155 pte_t *pte0; 156 pte_t *pte1; 157}; 158#else 159struct kimage_arch { 160 pud_t *pud; 161 pmd_t *pmd; 162 pte_t *pte; 163}; 164#endif 165 166#endif /* __ASSEMBLY__ */ 167 168#endif /* _ASM_X86_KEXEC_H */ 169