kexec: support for kexec on panic using new system call

[linux.git] / arch / x86 / include / asm / kexec.h

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 0dfccced4edf4629137a99f3bb09ba2666e2db5d..d2434c1cad0558e2664d8f7587ed4701d049edd5 100644 (file)
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h
@@ -25,6 +25,8 @@
 #include <asm/ptrace.h>
 #include <asm/bootparam.h>
 
+struct kimage;
+
 /*
  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  * I.e. Maximum page that is mapped directly into kernel memory,
@@ -62,6 +64,10 @@
 # define KEXEC_ARCH KEXEC_ARCH_X86_64
 #endif
 
+/* Memory to backup during crash kdump */
+#define KEXEC_BACKUP_SRC_START (0UL)
+#define KEXEC_BACKUP_SRC_END   (640 * 1024UL)  /* 640K */
+
 /*
  * 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
@@ -161,17 +167,35 @@ struct kimage_arch {
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
+       /* Details of backup region */
+       unsigned long backup_src_start;
+       unsigned long backup_src_sz;
+
+       /* Physical address of backup segment */
+       unsigned long backup_load_addr;
+
+       /* Core ELF header buffer */
+       void *elf_headers;
+       unsigned long elf_headers_sz;
+       unsigned long elf_load_addr;
 };
+#endif /* CONFIG_X86_32 */
 
+#ifdef CONFIG_X86_64
+/*
+ * Number of elements and order of elements in this structure should match
+ * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
+ * make an appropriate change in purgatory too.
+ */
 struct kexec_entry64_regs {
        uint64_t rax;
-       uint64_t rbx;
        uint64_t rcx;
        uint64_t rdx;
-       uint64_t rsi;
-       uint64_t rdi;
+       uint64_t rbx;
        uint64_t rsp;
        uint64_t rbp;
+       uint64_t rsi;
+       uint64_t rdi;
        uint64_t r8;
        uint64_t r9;
        uint64_t r10;