1 files changed, 175 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
new file mode 100644
index 000000000000..ea09600d6129
--- /dev/null
+++ b/arch/x86/include/asm/kexec.h
@@ -0,0 +1,175 @@
+#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 VA_PGD                 3
+# define PA_PTE_0               4
+# define VA_PTE_0               5
+# define PA_PTE_1               6
+# define VA_PTE_1               7
+# define PA_SWAP_PAGE           8
+# ifdef CONFIG_X86_PAE
+#  define PA_PMD_0              9
+#  define VA_PMD_0              10
+#  define PA_PMD_1              11
+#  define VA_PMD_1              12
+#  define PAGES_NR              13
+# else
+#  define PAGES_NR              9
+# endif
+#else
+# define PA_CONTROL_PAGE        0
+# define VA_CONTROL_PAGE        1
+# define PA_PGD                 2
+# define VA_PGD                 3
+# define PA_PUD_0               4
+# define VA_PUD_0               5
+# define PA_PMD_0               6
+# define VA_PMD_0               7
+# define PA_PTE_0               8
+# define VA_PTE_0               9
+# define PA_PUD_1               10
+# define VA_PUD_1               11
+# define PA_PMD_1               12
+# define VA_PMD_1               13
+# define PA_PTE_1               14
+# define VA_PTE_1               15
+# define PA_TABLE_PAGE          16
+# define PAGES_NR               17
+#endif
+#ifdef CONFIG_X86_32
+# define KEXEC_CONTROL_CODE_MAX_SIZE    2048
+#endif
+#ifndef __ASSEMBLY__
+#include <linux/string.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+/*
+ * 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      (0xFFFFFFFFFFUL)
+/* Maximum address we can reach in physical address mode */
+# define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
+/* Maximum address we can use for the control pages */
+# define KEXEC_CONTROL_MEMORY_LIMIT     (0xFFFFFFFFFFUL)
+/* 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
+/*
+ * CPU does not save ss and sp on stack if execution is already
+ * running in kernel mode at the time of NMI occurrence. This code
+ * fixes it.
+ */
+static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
+                                      struct pt_regs *oldregs)
+{
+#ifdef CONFIG_X86_32
+        newregs->sp = (unsigned long)&(oldregs->sp);
+        asm volatile("xorl %%eax, %%eax\n\t"
+                     "movw %%ss, %%ax\n\t"
+                     :"=a"(newregs->ss));
+#endif
+}
+/*
+ * 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));
+                crash_fixup_ss_esp(newregs, oldregs);
+        } 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 = (unsigned long)current_text_addr();
+        }
+}
+#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
+NORET_TYPE void
+relocate_kernel(unsigned long indirection_page,
+                unsigned long page_list,
+                unsigned long start_address) ATTRIB_NORET;
+#endif
+#endif /* __ASSEMBLY__ */
+#endif /* ASM_X86__KEXEC_H */

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h new file mode 100644 index 000000000000..ea09600d6129 --- /dev/null +++ b/arch/x86/include/asm/kexec.h
@@ -0,0 +1,175 @@
	1	#ifndef ASM_X86__KEXEC_H
	2	#define ASM_X86__KEXEC_H
	3
	4	#ifdef CONFIG_X86_32
	5	# define PA_CONTROL_PAGE 0
	6	# define VA_CONTROL_PAGE 1
	7	# define PA_PGD 2
	8	# define VA_PGD 3
	9	# define PA_PTE_0 4
	10	# define VA_PTE_0 5
	11	# define PA_PTE_1 6
	12	# define VA_PTE_1 7
	13	# define PA_SWAP_PAGE 8
	14	# ifdef CONFIG_X86_PAE
	15	# define PA_PMD_0 9
	16	# define VA_PMD_0 10
	17	# define PA_PMD_1 11
	18	# define VA_PMD_1 12
	19	# define PAGES_NR 13
	20	# else
	21	# define PAGES_NR 9
	22	# endif
	23	#else
	24	# define PA_CONTROL_PAGE 0
	25	# define VA_CONTROL_PAGE 1
	26	# define PA_PGD 2
	27	# define VA_PGD 3
	28	# define PA_PUD_0 4
	29	# define VA_PUD_0 5
	30	# define PA_PMD_0 6
	31	# define VA_PMD_0 7
	32	# define PA_PTE_0 8
	33	# define VA_PTE_0 9
	34	# define PA_PUD_1 10
	35	# define VA_PUD_1 11
	36	# define PA_PMD_1 12
	37	# define VA_PMD_1 13
	38	# define PA_PTE_1 14
	39	# define VA_PTE_1 15
	40	# define PA_TABLE_PAGE 16
	41	# define PAGES_NR 17
	42	#endif
	43
	44	#ifdef CONFIG_X86_32
	45	# define KEXEC_CONTROL_CODE_MAX_SIZE 2048
	46	#endif
	47
	48	#ifndef __ASSEMBLY__
	49
	50	#include <linux/string.h>
	51
	52	#include <asm/page.h>
	53	#include <asm/ptrace.h>
	54
	55	/*
	56	* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
	57	* I.e. Maximum page that is mapped directly into kernel memory,
	58	* and kmap is not required.
	59	*
	60	* So far x86_64 is limited to 40 physical address bits.
	61	*/
	62	#ifdef CONFIG_X86_32
	63	/* Maximum physical address we can use pages from */
	64	# define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
	65	/* Maximum address we can reach in physical address mode */
	66	# define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
	67	/* Maximum address we can use for the control code buffer */
	68	# define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
	69
	70	# define KEXEC_CONTROL_PAGE_SIZE 4096
	71
	72	/* The native architecture */
	73	# define KEXEC_ARCH KEXEC_ARCH_386
	74
	75	/* We can also handle crash dumps from 64 bit kernel. */
	76	# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
	77	#else
	78	/* Maximum physical address we can use pages from */
	79	# define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL)
	80	/* Maximum address we can reach in physical address mode */
	81	# define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
	82	/* Maximum address we can use for the control pages */
	83	# define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL)
	84
	85	/* Allocate one page for the pdp and the second for the code */
	86	# define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
	87
	88	/* The native architecture */
	89	# define KEXEC_ARCH KEXEC_ARCH_X86_64
	90	#endif
	91
	92	/*
	93	* CPU does not save ss and sp on stack if execution is already
	94	* running in kernel mode at the time of NMI occurrence. This code
	95	* fixes it.
	96	*/
	97	static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
	98	struct pt_regs *oldregs)
	99	{
	100	#ifdef CONFIG_X86_32
	101	newregs->sp = (unsigned long)&(oldregs->sp);
	102	asm volatile("xorl %%eax, %%eax\n\t"
	103	"movw %%ss, %%ax\n\t"
	104	:"=a"(newregs->ss));
	105	#endif
	106	}
	107
	108	/*
	109	* This function is responsible for capturing register states if coming
	110	* via panic otherwise just fix up the ss and sp if coming via kernel
	111	* mode exception.
	112	*/
	113	static inline void crash_setup_regs(struct pt_regs *newregs,
	114	struct pt_regs *oldregs)
	115	{
	116	if (oldregs) {
	117	memcpy(newregs, oldregs, sizeof(*newregs));
	118	crash_fixup_ss_esp(newregs, oldregs);
	119	} else {
	120	#ifdef CONFIG_X86_32
	121	asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
	122	asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
	123	asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
	124	asm volatile("movl %%esi,%0" : "=m"(newregs->si));
	125	asm volatile("movl %%edi,%0" : "=m"(newregs->di));
	126	asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
	127	asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
	128	asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
	129	asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
	130	asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
	131	asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
	132	asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
	133	asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
	134	#else
	135	asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
	136	asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
	137	asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
	138	asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
	139	asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
	140	asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
	141	asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
	142	asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
	143	asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
	144	asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
	145	asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
	146	asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
	147	asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
	148	asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
	149	asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
	150	asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
	151	asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
	152	asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
	153	asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
	154	#endif
	155	newregs->ip = (unsigned long)current_text_addr();
	156	}
	157	}
	158
	159	#ifdef CONFIG_X86_32
	160	asmlinkage unsigned long
	161	relocate_kernel(unsigned long indirection_page,
	162	unsigned long control_page,
	163	unsigned long start_address,
	164	unsigned int has_pae,
	165	unsigned int preserve_context);
	166	#else
	167	NORET_TYPE void
	168	relocate_kernel(unsigned long indirection_page,
	169	unsigned long page_list,
	170	unsigned long start_address) ATTRIB_NORET;
	171	#endif
	172
	173	#endif /* __ASSEMBLY__ */
	174
	175	#endif /* ASM_X86__KEXEC_H */