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DEFINITIONS
This source file includes following definitions.
- crash_fixup_ss_esp
- crash_setup_regs
#ifndef ASM_X86__KEXEC_H
#define ASM_X86__KEXEC_H
#ifdef CONFIG_X86_32
# define PA_CONTROL_PAGE 0
# define VA_CONTROL_PAGE 1
# define PA_PGD 2
# define VA_PGD 3
# define PA_PTE_0 4
# define VA_PTE_0 5
# define PA_PTE_1 6
# define VA_PTE_1 7
# define PA_SWAP_PAGE 8
# ifdef CONFIG_X86_PAE
# define PA_PMD_0 9
# define VA_PMD_0 10
# define PA_PMD_1 11
# define VA_PMD_1 12
# define PAGES_NR 13
# else
# define PAGES_NR 9
# endif
#else
# define PA_CONTROL_PAGE 0
# define VA_CONTROL_PAGE 1
# define PA_PGD 2
# define VA_PGD 3
# define PA_PUD_0 4
# define VA_PUD_0 5
# define PA_PMD_0 6
# define VA_PMD_0 7
# define PA_PTE_0 8
# define VA_PTE_0 9
# define PA_PUD_1 10
# define VA_PUD_1 11
# define PA_PMD_1 12
# define VA_PMD_1 13
# define PA_PTE_1 14
# define VA_PTE_1 15
# define PA_TABLE_PAGE 16
# define PAGES_NR 17
#endif
#ifdef CONFIG_X86_32
# define KEXEC_CONTROL_CODE_MAX_SIZE 2048
#endif
#ifndef __ASSEMBLY__
#include <linux/string.h>
#include <asm/page.h>
#include <asm/ptrace.h>
/*
* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
* I.e. Maximum page that is mapped directly into kernel memory,
* and kmap is not required.
*
* So far x86_64 is limited to 40 physical address bits.
*/
#ifdef CONFIG_X86_32
/* Maximum physical address we can use pages from */
# define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
/* Maximum address we can reach in physical address mode */
# define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
/* Maximum address we can use for the control code buffer */
# define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
# define KEXEC_CONTROL_PAGE_SIZE 4096
/* The native architecture */
# define KEXEC_ARCH KEXEC_ARCH_386
/* We can also handle crash dumps from 64 bit kernel. */
# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
#else
/* Maximum physical address we can use pages from */
# define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL)
/* Maximum address we can reach in physical address mode */
# define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
/* Maximum address we can use for the control pages */
# define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL)
/* Allocate one page for the pdp and the second for the code */
# define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
/* The native architecture */
# define KEXEC_ARCH KEXEC_ARCH_X86_64
#endif
/*
* CPU does not save ss and sp on stack if execution is already
* running in kernel mode at the time of NMI occurrence. This code
* fixes it.
*/
static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
#ifdef CONFIG_X86_32
newregs->sp = (unsigned long)&(oldregs->sp);
asm volatile("xorl %%eax, %%eax\n\t"
"movw %%ss, %%ax\n\t"
:"=a"(newregs->ss));
#endif
}
/*
* This function is responsible for capturing register states if coming
* via panic otherwise just fix up the ss and sp if coming via kernel
* mode exception.
*/
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
if (oldregs) {
memcpy(newregs, oldregs, sizeof(*newregs));
crash_fixup_ss_esp(newregs, oldregs);
} else {
#ifdef CONFIG_X86_32
asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
asm volatile("movl %%esi,%0" : "=m"(newregs->si));
asm volatile("movl %%edi,%0" : "=m"(newregs->di));
asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
#else
asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
#endif
newregs->ip = (unsigned long)current_text_addr();
}
}
#ifdef CONFIG_X86_32
asmlinkage unsigned long
relocate_kernel(unsigned long indirection_page,
unsigned long control_page,
unsigned long start_address,
unsigned int has_pae,
unsigned int preserve_context);
#else
NORET_TYPE void
relocate_kernel(unsigned long indirection_page,
unsigned long page_list,
unsigned long start_address) ATTRIB_NORET;
#endif
#endif /* __ASSEMBLY__ */
#endif /* ASM_X86__KEXEC_H */