1 #ifndef _ASM_X86_KEXEC_H
2 #define _ASM_X86_KEXEC_H
5 # define PA_CONTROL_PAGE 0
6 # define VA_CONTROL_PAGE 1
8 # define PA_SWAP_PAGE 3
11 # define PA_CONTROL_PAGE 0
12 # define VA_CONTROL_PAGE 1
13 # define PA_TABLE_PAGE 2
14 # define PA_SWAP_PAGE 3
18 # define KEXEC_CONTROL_CODE_MAX_SIZE 2048
22 #include <linux/string.h>
25 #include <asm/ptrace.h>
26 #include <asm/bootparam.h>
31 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
32 * I.e. Maximum page that is mapped directly into kernel memory,
33 * and kmap is not required.
35 * So far x86_64 is limited to 40 physical address bits.
38 /* Maximum physical address we can use pages from */
39 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
40 /* Maximum address we can reach in physical address mode */
41 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
42 /* Maximum address we can use for the control code buffer */
43 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
45 # define KEXEC_CONTROL_PAGE_SIZE 4096
47 /* The native architecture */
48 # define KEXEC_ARCH KEXEC_ARCH_386
50 /* We can also handle crash dumps from 64 bit kernel. */
51 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
53 /* Maximum physical address we can use pages from */
54 # define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1)
55 /* Maximum address we can reach in physical address mode */
56 # define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
57 /* Maximum address we can use for the control pages */
58 # define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1)
60 /* Allocate one page for the pdp and the second for the code */
61 # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
63 /* The native architecture */
64 # define KEXEC_ARCH KEXEC_ARCH_X86_64
67 /* Memory to backup during crash kdump */
68 #define KEXEC_BACKUP_SRC_START (0UL)
69 #define KEXEC_BACKUP_SRC_END (640 * 1024UL) /* 640K */
72 * CPU does not save ss and sp on stack if execution is already
73 * running in kernel mode at the time of NMI occurrence. This code
76 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
77 struct pt_regs *oldregs)
80 newregs->sp = (unsigned long)&(oldregs->sp);
81 asm volatile("xorl %%eax, %%eax\n\t"
88 * This function is responsible for capturing register states if coming
89 * via panic otherwise just fix up the ss and sp if coming via kernel
92 static inline void crash_setup_regs(struct pt_regs *newregs,
93 struct pt_regs *oldregs)
96 memcpy(newregs, oldregs, sizeof(*newregs));
97 crash_fixup_ss_esp(newregs, oldregs);
100 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
101 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
102 asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
103 asm volatile("movl %%esi,%0" : "=m"(newregs->si));
104 asm volatile("movl %%edi,%0" : "=m"(newregs->di));
105 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
106 asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
107 asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
108 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
109 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
110 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
111 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
112 asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
114 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
115 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
116 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
117 asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
118 asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
119 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
120 asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
121 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
122 asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
123 asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
124 asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
125 asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
126 asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
127 asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
128 asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
129 asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
130 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
131 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
132 asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
134 newregs->ip = (unsigned long)current_text_addr();
139 asmlinkage unsigned long
140 relocate_kernel(unsigned long indirection_page,
141 unsigned long control_page,
142 unsigned long start_address,
143 unsigned int has_pae,
144 unsigned int preserve_context);
147 relocate_kernel(unsigned long indirection_page,
148 unsigned long page_list,
149 unsigned long start_address,
150 unsigned int preserve_context);
153 #define ARCH_HAS_KIMAGE_ARCH
158 #ifdef CONFIG_X86_PAE
170 /* Details of backup region */
171 unsigned long backup_src_start;
172 unsigned long backup_src_sz;
174 /* Physical address of backup segment */
175 unsigned long backup_load_addr;
177 /* Core ELF header buffer */
179 unsigned long elf_headers_sz;
180 unsigned long elf_load_addr;
182 #endif /* CONFIG_X86_32 */
186 * Number of elements and order of elements in this structure should match
187 * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
188 * make an appropriate change in purgatory too.
190 struct kexec_entry64_regs {
211 typedef void crash_vmclear_fn(void);
212 extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
214 #endif /* __ASSEMBLY__ */
216 #endif /* _ASM_X86_KEXEC_H */