4 #include <asm/fixmap.h>
5 #include <asm/ptrace.h>
8 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
9 * I.e. Maximum page that is mapped directly into kernel memory,
10 * and kmap is not required.
12 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
13 * calculation for the amount of memory directly mappable into the
14 * kernel memory space.
17 /* Maximum physical address we can use pages from */
18 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
19 /* Maximum address we can reach in physical address mode */
20 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
21 /* Maximum address we can use for the control code buffer */
22 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
24 #define KEXEC_CONTROL_CODE_SIZE 4096
26 /* The native architecture */
27 #define KEXEC_ARCH KEXEC_ARCH_386
29 #define MAX_NOTE_BYTES 1024
31 /* CPU does not save ss and esp on stack if execution is already
32 * running in kernel mode at the time of NMI occurrence. This code
35 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
36 struct pt_regs *oldregs)
38 memcpy(newregs, oldregs, sizeof(*newregs));
39 newregs->esp = (unsigned long)&(oldregs->esp);
41 "xorl %%eax, %%eax\n\t"
47 * This function is responsible for capturing register states if coming
48 * via panic otherwise just fix up the ss and esp if coming via kernel
51 static inline void crash_setup_regs(struct pt_regs *newregs,
52 struct pt_regs *oldregs)
55 crash_fixup_ss_esp(newregs, oldregs);
57 __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
58 __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
59 __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
60 __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
61 __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
62 __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
63 __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
64 __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
65 __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
66 __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
67 __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
68 __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
69 __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
71 newregs->eip = (unsigned long)current_text_addr();
75 #endif /* _I386_KEXEC_H */