| #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 { |
| p4d_t *p4d; |
| 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; |
| extern void kdump_nmi_shootdown_cpus(void); |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* _ASM_X86_KEXEC_H */ |