Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 1 | #ifndef _I386_KEXEC_H |
| 2 | #define _I386_KEXEC_H |
| 3 | |
| 4 | #include <asm/fixmap.h> |
Vivek Goyal | e996e58 | 2006-01-09 20:51:44 -0800 | [diff] [blame] | 5 | #include <asm/ptrace.h> |
Vivek Goyal | f05b690 | 2006-01-09 20:51:44 -0800 | [diff] [blame^] | 6 | #include <asm/string.h> |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 7 | |
| 8 | /* |
| 9 | * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. |
| 10 | * I.e. Maximum page that is mapped directly into kernel memory, |
| 11 | * and kmap is not required. |
| 12 | * |
| 13 | * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct |
| 14 | * calculation for the amount of memory directly mappable into the |
| 15 | * kernel memory space. |
| 16 | */ |
| 17 | |
| 18 | /* Maximum physical address we can use pages from */ |
| 19 | #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) |
| 20 | /* Maximum address we can reach in physical address mode */ |
| 21 | #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) |
| 22 | /* Maximum address we can use for the control code buffer */ |
| 23 | #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE |
| 24 | |
| 25 | #define KEXEC_CONTROL_CODE_SIZE 4096 |
| 26 | |
| 27 | /* The native architecture */ |
| 28 | #define KEXEC_ARCH KEXEC_ARCH_386 |
| 29 | |
Vivek Goyal | 625f1c82 | 2005-06-25 14:58:12 -0700 | [diff] [blame] | 30 | #define MAX_NOTE_BYTES 1024 |
Vivek Goyal | 625f1c82 | 2005-06-25 14:58:12 -0700 | [diff] [blame] | 31 | |
Vivek Goyal | e996e58 | 2006-01-09 20:51:44 -0800 | [diff] [blame] | 32 | /* CPU does not save ss and esp on stack if execution is already |
| 33 | * running in kernel mode at the time of NMI occurrence. This code |
| 34 | * fixes it. |
| 35 | */ |
| 36 | static inline void crash_fixup_ss_esp(struct pt_regs *newregs, |
| 37 | struct pt_regs *oldregs) |
| 38 | { |
| 39 | memcpy(newregs, oldregs, sizeof(*newregs)); |
| 40 | newregs->esp = (unsigned long)&(oldregs->esp); |
| 41 | __asm__ __volatile__( |
| 42 | "xorl %%eax, %%eax\n\t" |
| 43 | "movw %%ss, %%ax\n\t" |
| 44 | :"=a"(newregs->xss)); |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * This function is responsible for capturing register states if coming |
| 49 | * via panic otherwise just fix up the ss and esp if coming via kernel |
| 50 | * mode exception. |
| 51 | */ |
| 52 | static inline void crash_setup_regs(struct pt_regs *newregs, |
| 53 | struct pt_regs *oldregs) |
| 54 | { |
| 55 | if (oldregs) |
| 56 | crash_fixup_ss_esp(newregs, oldregs); |
| 57 | else { |
| 58 | __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx)); |
| 59 | __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx)); |
| 60 | __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx)); |
| 61 | __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi)); |
| 62 | __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi)); |
| 63 | __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp)); |
| 64 | __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax)); |
| 65 | __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp)); |
| 66 | __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss)); |
| 67 | __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs)); |
| 68 | __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds)); |
| 69 | __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes)); |
| 70 | __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags)); |
| 71 | |
| 72 | newregs->eip = (unsigned long)current_text_addr(); |
| 73 | } |
| 74 | } |
| 75 | |
Eric W. Biederman | 5033cba | 2005-06-25 14:57:56 -0700 | [diff] [blame] | 76 | #endif /* _I386_KEXEC_H */ |