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/* 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 <linux/module.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 - 1) /* 640K / / * 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 sme_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; / 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; }; 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 #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 #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 */

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