arch/x86/include/asm/kexec.h

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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 PA_SWAP_PAGE           3
# define PAGES_NR               4
#else
# define PA_CONTROL_PAGE        0
# define VA_CONTROL_PAGE        1
# define PA_TABLE_PAGE          2
# define PA_SWAP_PAGE           3
# define PAGES_NR               4
#endif

# define KEXEC_CONTROL_CODE_MAX_SIZE    2048

#ifndef __ASSEMBLY__

#include <linux/string.h>

#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/bootparam.h>

struct kimage;

/*
 * 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      (MAXMEM-1)
/* Maximum address we can reach in physical address mode */
# define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
/* Maximum address we can use for the control pages */
# define KEXEC_CONTROL_MEMORY_LIMIT     (MAXMEM-1)

/* 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

/* Memory to backup during crash kdump */
#define KEXEC_BACKUP_SRC_START  (0UL)
#define KEXEC_BACKUP_SRC_END    (640 * 1024UL)  /* 640K */

/*
 * 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
unsigned long
relocate_kernel(unsigned long indirection_page,
                unsigned long page_list,
                unsigned long start_address,
                unsigned int preserve_context);
#endif

#define ARCH_HAS_KIMAGE_ARCH

#ifdef CONFIG_X86_32
struct kimage_arch {
        pgd_t *pgd;
#ifdef CONFIG_X86_PAE
        pmd_t *pmd0;
        pmd_t *pmd1;
#endif
        pte_t *pte0;
        pte_t *pte1;
};
#else
struct kimage_arch {
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
        /* Details of backup region */
        unsigned long backup_src_start;
        unsigned long backup_src_sz;

        /* Physical address of backup segment */
        unsigned long backup_load_addr;

        /* Core ELF header buffer */
        void *elf_headers;
        unsigned long elf_headers_sz;
        unsigned long elf_load_addr;
};
#endif /* CONFIG_X86_32 */

#ifdef CONFIG_X86_64
/*
 * Number of elements and order of elements in this structure should match
 * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
 * make an appropriate change in purgatory too.
 */
struct kexec_entry64_regs {
        uint64_t rax;
        uint64_t rcx;
        uint64_t rdx;
        uint64_t rbx;
        uint64_t rsp;
        uint64_t rbp;
        uint64_t rsi;
        uint64_t rdi;
        uint64_t r8;
        uint64_t r9;
        uint64_t r10;
        uint64_t r11;
        uint64_t r12;
        uint64_t r13;
        uint64_t r14;
        uint64_t r15;
        uint64_t rip;
};
#endif

typedef void crash_vmclear_fn(void);
extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_KEXEC_H */
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root/arch/x86/include/asm/kexec.h

INCLUDED FROM

DEFINITIONS
