1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KEXEC_H
3 #define _ASM_X86_KEXEC_H
6 # define PA_CONTROL_PAGE 0
7 # define VA_CONTROL_PAGE 1
9 # define PA_SWAP_PAGE 3
12 # define PA_CONTROL_PAGE 0
13 # define VA_CONTROL_PAGE 1
14 # define PA_TABLE_PAGE 2
15 # define PA_SWAP_PAGE 3
19 # define KEXEC_CONTROL_CODE_MAX_SIZE 2048
23 #include <linux/string.h>
26 #include <asm/ptrace.h>
27 #include <asm/bootparam.h>
32 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
33 * I.e. Maximum page that is mapped directly into kernel memory,
34 * and kmap is not required.
36 * So far x86_64 is limited to 40 physical address bits.
39 /* Maximum physical address we can use pages from */
40 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
41 /* Maximum address we can reach in physical address mode */
42 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
43 /* Maximum address we can use for the control code buffer */
44 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
46 # define KEXEC_CONTROL_PAGE_SIZE 4096
48 /* The native architecture */
49 # define KEXEC_ARCH KEXEC_ARCH_386
51 /* We can also handle crash dumps from 64 bit kernel. */
52 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
54 /* Maximum physical address we can use pages from */
55 # define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1)
56 /* Maximum address we can reach in physical address mode */
57 # define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
58 /* Maximum address we can use for the control pages */
59 # define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1)
61 /* Allocate one page for the pdp and the second for the code */
62 # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
64 /* The native architecture */
65 # define KEXEC_ARCH KEXEC_ARCH_X86_64
68 /* Memory to backup during crash kdump */
69 #define KEXEC_BACKUP_SRC_START (0UL)
70 #define KEXEC_BACKUP_SRC_END (640 * 1024UL) /* 640K */
73 * CPU does not save ss and sp on stack if execution is already
74 * running in kernel mode at the time of NMI occurrence. This code
77 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
78 struct pt_regs *oldregs)
81 newregs->sp = (unsigned long)&(oldregs->sp);
82 asm volatile("xorl %%eax, %%eax\n\t"
89 * This function is responsible for capturing register states if coming
90 * via panic otherwise just fix up the ss and sp if coming via kernel
93 static inline void crash_setup_regs(struct pt_regs *newregs,
94 struct pt_regs *oldregs)
97 memcpy(newregs, oldregs, sizeof(*newregs));
98 crash_fixup_ss_esp(newregs, oldregs);
101 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
102 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
103 asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
104 asm volatile("movl %%esi,%0" : "=m"(newregs->si));
105 asm volatile("movl %%edi,%0" : "=m"(newregs->di));
106 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
107 asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
108 asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
109 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
110 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
111 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
112 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
113 asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
115 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
116 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
117 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
118 asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
119 asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
120 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
121 asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
122 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
123 asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
124 asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
125 asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
126 asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
127 asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
128 asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
129 asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
130 asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
131 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
132 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
133 asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
135 newregs->ip = (unsigned long)current_text_addr();
140 asmlinkage unsigned long
141 relocate_kernel(unsigned long indirection_page,
142 unsigned long control_page,
143 unsigned long start_address,
144 unsigned int has_pae,
145 unsigned int preserve_context);
148 relocate_kernel(unsigned long indirection_page,
149 unsigned long page_list,
150 unsigned long start_address,
151 unsigned int preserve_context,
152 unsigned int sme_active);
155 #define ARCH_HAS_KIMAGE_ARCH
160 #ifdef CONFIG_X86_PAE
173 /* Details of backup region */
174 unsigned long backup_src_start;
175 unsigned long backup_src_sz;
177 /* Physical address of backup segment */
178 unsigned long backup_load_addr;
180 /* Core ELF header buffer */
182 unsigned long elf_headers_sz;
183 unsigned long elf_load_addr;
185 #endif /* CONFIG_X86_32 */
189 * Number of elements and order of elements in this structure should match
190 * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
191 * make an appropriate change in purgatory too.
193 struct kexec_entry64_regs {
213 extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
215 #define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
217 extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
218 #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
222 typedef void crash_vmclear_fn(void);
223 extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
224 extern void kdump_nmi_shootdown_cpus(void);
226 #endif /* __ASSEMBLY__ */
228 #endif /* _ASM_X86_KEXEC_H */