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 PA_TABLE_PAGE 1
17 # define KEXEC_CONTROL_CODE_MAX_SIZE 2048
22 #include <linux/string.h>
25 #include <asm/ptrace.h>
28 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
29 * I.e. Maximum page that is mapped directly into kernel memory,
30 * and kmap is not required.
32 * So far x86_64 is limited to 40 physical address bits.
35 /* Maximum physical address we can use pages from */
36 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
37 /* Maximum address we can reach in physical address mode */
38 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
39 /* Maximum address we can use for the control code buffer */
40 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
42 # define KEXEC_CONTROL_PAGE_SIZE 4096
44 /* The native architecture */
45 # define KEXEC_ARCH KEXEC_ARCH_386
47 /* We can also handle crash dumps from 64 bit kernel. */
48 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
50 /* Maximum physical address we can use pages from */
51 # define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL)
52 /* Maximum address we can reach in physical address mode */
53 # define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
54 /* Maximum address we can use for the control pages */
55 # define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL)
57 /* Allocate one page for the pdp and the second for the code */
58 # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
60 /* The native architecture */
61 # define KEXEC_ARCH KEXEC_ARCH_X86_64
65 * CPU does not save ss and sp on stack if execution is already
66 * running in kernel mode at the time of NMI occurrence. This code
69 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
70 struct pt_regs *oldregs)
73 newregs->sp = (unsigned long)&(oldregs->sp);
74 asm volatile("xorl %%eax, %%eax\n\t"
81 * This function is responsible for capturing register states if coming
82 * via panic otherwise just fix up the ss and sp if coming via kernel
85 static inline void crash_setup_regs(struct pt_regs *newregs,
86 struct pt_regs *oldregs)
89 memcpy(newregs, oldregs, sizeof(*newregs));
90 crash_fixup_ss_esp(newregs, oldregs);
93 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
94 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
95 asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
96 asm volatile("movl %%esi,%0" : "=m"(newregs->si));
97 asm volatile("movl %%edi,%0" : "=m"(newregs->di));
98 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
99 asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
100 asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
101 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
102 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
103 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
104 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
105 asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
107 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
108 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
109 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
110 asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
111 asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
112 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
113 asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
114 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
115 asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
116 asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
117 asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
118 asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
119 asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
120 asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
121 asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
122 asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
123 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
124 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
125 asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
127 newregs->ip = (unsigned long)current_text_addr();
132 asmlinkage unsigned long
133 relocate_kernel(unsigned long indirection_page,
134 unsigned long control_page,
135 unsigned long start_address,
136 unsigned int has_pae,
137 unsigned int preserve_context);
140 relocate_kernel(unsigned long indirection_page,
141 unsigned long page_list,
142 unsigned long start_address) ATTRIB_NORET;
145 #define ARCH_HAS_KIMAGE_ARCH
150 #ifdef CONFIG_X86_PAE
165 #endif /* __ASSEMBLY__ */
167 #endif /* _ASM_X86_KEXEC_H */