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While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with UAPI headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is mostly a mechanical patch (done with a simple "sed -i" statement), with some manual tweaks in <asm/frame.h>, <asm/hw_irq.h> and <asm/setup.h> that mentioned this macro in comments with some missing underscores. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250314071013.1575167-38-thuth@redhat.com
223 lines
6.5 KiB
C
223 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_KEXEC_H
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#define _ASM_X86_KEXEC_H
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#ifdef CONFIG_X86_32
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# define PA_CONTROL_PAGE 0
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# define VA_CONTROL_PAGE 1
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# define PA_PGD 2
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# define PA_SWAP_PAGE 3
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# define PAGES_NR 4
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#endif
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# define KEXEC_CONTROL_PAGE_SIZE 4096
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# define KEXEC_CONTROL_CODE_MAX_SIZE 2048
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#ifndef __ASSEMBLER__
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/asm.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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struct kimage;
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/*
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* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
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* I.e. Maximum page that is mapped directly into kernel memory,
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* and kmap is not required.
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*
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* So far x86_64 is limited to 40 physical address bits.
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*/
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#ifdef CONFIG_X86_32
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/* Maximum physical address we can use pages from */
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# define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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# define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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# define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
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/* The native architecture */
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# define KEXEC_ARCH KEXEC_ARCH_386
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/* We can also handle crash dumps from 64 bit kernel. */
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# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
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#else
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/* Maximum physical address we can use pages from */
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# define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1)
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/* Maximum address we can reach in physical address mode */
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# define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
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/* Maximum address we can use for the control pages */
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# define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1)
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/* The native architecture */
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# define KEXEC_ARCH KEXEC_ARCH_X86_64
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extern unsigned long kexec_va_control_page;
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extern unsigned long kexec_pa_table_page;
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extern unsigned long kexec_pa_swap_page;
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#endif
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/*
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* This function is responsible for capturing register states if coming
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* via panic otherwise just fix up the ss and sp if coming via kernel
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* mode exception.
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*/
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs) {
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memcpy(newregs, oldregs, sizeof(*newregs));
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} else {
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asm volatile("mov %%" _ASM_BX ",%0" : "=m"(newregs->bx));
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asm volatile("mov %%" _ASM_CX ",%0" : "=m"(newregs->cx));
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asm volatile("mov %%" _ASM_DX ",%0" : "=m"(newregs->dx));
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asm volatile("mov %%" _ASM_SI ",%0" : "=m"(newregs->si));
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asm volatile("mov %%" _ASM_DI ",%0" : "=m"(newregs->di));
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asm volatile("mov %%" _ASM_BP ",%0" : "=m"(newregs->bp));
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asm volatile("mov %%" _ASM_AX ",%0" : "=m"(newregs->ax));
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asm volatile("mov %%" _ASM_SP ",%0" : "=m"(newregs->sp));
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#ifdef CONFIG_X86_64
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asm volatile("mov %%r8,%0" : "=m"(newregs->r8));
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asm volatile("mov %%r9,%0" : "=m"(newregs->r9));
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asm volatile("mov %%r10,%0" : "=m"(newregs->r10));
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asm volatile("mov %%r11,%0" : "=m"(newregs->r11));
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asm volatile("mov %%r12,%0" : "=m"(newregs->r12));
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asm volatile("mov %%r13,%0" : "=m"(newregs->r13));
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asm volatile("mov %%r14,%0" : "=m"(newregs->r14));
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asm volatile("mov %%r15,%0" : "=m"(newregs->r15));
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#endif
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asm volatile("mov %%ss,%k0" : "=a"(newregs->ss));
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asm volatile("mov %%cs,%k0" : "=a"(newregs->cs));
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#ifdef CONFIG_X86_32
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asm volatile("mov %%ds,%k0" : "=a"(newregs->ds));
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asm volatile("mov %%es,%k0" : "=a"(newregs->es));
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#endif
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asm volatile("pushf\n\t"
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"pop %0" : "=m"(newregs->flags));
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newregs->ip = _THIS_IP_;
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}
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}
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#ifdef CONFIG_X86_32
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typedef asmlinkage unsigned long
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relocate_kernel_fn(unsigned long indirection_page,
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unsigned long control_page,
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unsigned long start_address,
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unsigned int has_pae,
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unsigned int preserve_context);
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#else
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typedef unsigned long
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relocate_kernel_fn(unsigned long indirection_page,
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unsigned long pa_control_page,
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unsigned long start_address,
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unsigned int preserve_context,
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unsigned int host_mem_enc_active);
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#endif
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extern relocate_kernel_fn relocate_kernel;
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#define ARCH_HAS_KIMAGE_ARCH
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#ifdef CONFIG_X86_32
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struct kimage_arch {
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pgd_t *pgd;
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#ifdef CONFIG_X86_PAE
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pmd_t *pmd0;
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pmd_t *pmd1;
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#endif
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pte_t *pte0;
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pte_t *pte1;
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};
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#else
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struct kimage_arch {
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/*
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* This is a kimage control page, as it must not overlap with either
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* source or destination address ranges.
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*/
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pgd_t *pgd;
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/*
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* The virtual mapping of the control code page itself is used only
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* during the transition, while the current kernel's pages are all
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* in place. Thus the intermediate page table pages used to map it
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* are not control pages, but instead just normal pages obtained
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* with get_zeroed_page(). And have to be tracked (below) so that
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* they can be freed.
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*/
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p4d_t *p4d;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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};
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#endif /* CONFIG_X86_32 */
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#ifdef CONFIG_X86_64
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/*
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* Number of elements and order of elements in this structure should match
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* with the ones in arch/x86/purgatory/entry64.S. If you make a change here
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* make an appropriate change in purgatory too.
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*/
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struct kexec_entry64_regs {
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uint64_t rax;
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uint64_t rcx;
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uint64_t rdx;
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uint64_t rbx;
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uint64_t rsp;
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uint64_t rbp;
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uint64_t rsi;
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uint64_t rdi;
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uint64_t r8;
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uint64_t r9;
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uint64_t r10;
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uint64_t r11;
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uint64_t r12;
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uint64_t r13;
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uint64_t r14;
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uint64_t r15;
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uint64_t rip;
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};
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extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
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gfp_t gfp);
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#define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
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extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
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#define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
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void arch_kexec_protect_crashkres(void);
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#define arch_kexec_protect_crashkres arch_kexec_protect_crashkres
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void arch_kexec_unprotect_crashkres(void);
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#define arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres
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#ifdef CONFIG_KEXEC_FILE
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struct purgatory_info;
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int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
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Elf_Shdr *section,
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const Elf_Shdr *relsec,
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const Elf_Shdr *symtab);
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#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
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int arch_kimage_file_post_load_cleanup(struct kimage *image);
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#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
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#endif
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#endif
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extern void kdump_nmi_shootdown_cpus(void);
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#ifdef CONFIG_CRASH_HOTPLUG
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void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
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#define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
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int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
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#define arch_crash_hotplug_support arch_crash_hotplug_support
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unsigned int arch_crash_get_elfcorehdr_size(void);
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#define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
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#endif
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_X86_KEXEC_H */
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