1#ifndef _I386_KEXEC_H 2#define _I386_KEXEC_H 3 4#define PA_CONTROL_PAGE 0 5#define VA_CONTROL_PAGE 1 6#define PA_PGD 2 7#define VA_PGD 3 8#define PA_PTE_0 4 9#define VA_PTE_0 5 10#define PA_PTE_1 6 11#define VA_PTE_1 7 12#ifdef CONFIG_X86_PAE 13#define PA_PMD_0 8 14#define VA_PMD_0 9 15#define PA_PMD_1 10 16#define VA_PMD_1 11 17#define PAGES_NR 12 18#else 19#define PAGES_NR 8 20#endif 21 22#ifndef __ASSEMBLY__ 23 24#include <asm/ptrace.h> 25#include <asm/string.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 33/* Maximum physical address we can use pages from */ 34#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) 35/* Maximum address we can reach in physical address mode */ 36#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) 37/* Maximum address we can use for the control code buffer */ 38#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE 39 40#define KEXEC_CONTROL_CODE_SIZE 4096 41 42/* The native architecture */ 43#define KEXEC_ARCH KEXEC_ARCH_386 44 45/* We can also handle crash dumps from 64 bit kernel. */ 46#define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64) 47 48/* CPU does not save ss and esp on stack if execution is already 49 * running in kernel mode at the time of NMI occurrence. This code 50 * fixes it. 51 */ 52static inline void crash_fixup_ss_esp(struct pt_regs *newregs, 53 struct pt_regs *oldregs) 54{ 55 memcpy(newregs, oldregs, sizeof(*newregs)); 56 newregs->esp = (unsigned long)&(oldregs->esp); 57 __asm__ __volatile__( 58 "xorl %%eax, %%eax\n\t" 59 "movw %%ss, %%ax\n\t" 60 :"=a"(newregs->xss)); 61} 62 63/* 64 * This function is responsible for capturing register states if coming 65 * via panic otherwise just fix up the ss and esp if coming via kernel 66 * mode exception. 67 */ 68static inline void crash_setup_regs(struct pt_regs *newregs, 69 struct pt_regs *oldregs) 70{ 71 if (oldregs) 72 crash_fixup_ss_esp(newregs, oldregs); 73 else { 74 __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx)); 75 __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx)); 76 __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx)); 77 __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi)); 78 __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi)); 79 __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp)); 80 __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax)); 81 __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp)); 82 __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss)); 83 __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs)); 84 __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds)); 85 __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes)); 86 __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags)); 87 88 newregs->eip = (unsigned long)current_text_addr(); 89 } 90} 91asmlinkage NORET_TYPE void 92relocate_kernel(unsigned long indirection_page, 93 unsigned long control_page, 94 unsigned long start_address, 95 unsigned int has_pae) ATTRIB_NORET; 96 97#endif /* __ASSEMBLY__ */ 98 99#endif /* _I386_KEXEC_H */ 100