215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#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 <linux/kernel.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
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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));
|
||
|
|
} 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 = _THIS_IP_;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#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,
|
||
|
|
unsigned int host_mem_enc_active);
|
||
|
|
#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 {
|
||
|
|
p4d_t *p4d;
|
||
|
|
pud_t *pud;
|
||
|
|
pmd_t *pmd;
|
||
|
|
pte_t *pte;
|
||
|
|
};
|
||
|
|
#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;
|
||
|
|
};
|
||
|
|
|
||
|
|
extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
|
||
|
|
gfp_t gfp);
|
||
|
|
#define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
|
||
|
|
|
||
|
|
extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
|
||
|
|
#define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
|
||
|
|
|
||
|
|
void arch_kexec_protect_crashkres(void);
|
||
|
|
#define arch_kexec_protect_crashkres arch_kexec_protect_crashkres
|
||
|
|
|
||
|
|
void arch_kexec_unprotect_crashkres(void);
|
||
|
|
#define arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres
|
||
|
|
|
||
|
|
#ifdef CONFIG_KEXEC_FILE
|
||
|
|
struct purgatory_info;
|
||
|
|
int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
|
||
|
|
Elf_Shdr *section,
|
||
|
|
const Elf_Shdr *relsec,
|
||
|
|
const Elf_Shdr *symtab);
|
||
|
|
#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
|
||
|
|
|
||
|
|
int arch_kimage_file_post_load_cleanup(struct kimage *image);
|
||
|
|
#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef void crash_vmclear_fn(void);
|
||
|
|
extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
|
||
|
|
extern void kdump_nmi_shootdown_cpus(void);
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLY__ */
|
||
|
|
|
||
|
|
#endif /* _ASM_X86_KEXEC_H */
|