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Diffstat (limited to 'include/linux/kexec.h')
-rw-r--r--include/linux/kexec.h104
1 files changed, 102 insertions, 2 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index a75641930049..4b2a0e11cc5b 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -10,6 +10,7 @@
#include <linux/ioport.h>
#include <linux/elfcore.h>
#include <linux/elf.h>
+#include <linux/module.h>
#include <asm/kexec.h>
/* Verify architecture specific macros are defined */
@@ -69,7 +70,18 @@ typedef unsigned long kimage_entry_t;
#define IND_SOURCE 0x8
struct kexec_segment {
- void __user *buf;
+ /*
+ * This pointer can point to user memory if kexec_load() system
+ * call is used or will point to kernel memory if
+ * kexec_file_load() system call is used.
+ *
+ * Use ->buf when expecting to deal with user memory and use ->kbuf
+ * when expecting to deal with kernel memory.
+ */
+ union {
+ void __user *buf;
+ void *kbuf;
+ };
size_t bufsz;
unsigned long mem;
size_t memsz;
@@ -84,6 +96,27 @@ struct compat_kexec_segment {
};
#endif
+struct kexec_sha_region {
+ unsigned long start;
+ unsigned long len;
+};
+
+struct purgatory_info {
+ /* Pointer to elf header of read only purgatory */
+ Elf_Ehdr *ehdr;
+
+ /* Pointer to purgatory sechdrs which are modifiable */
+ Elf_Shdr *sechdrs;
+ /*
+ * Temporary buffer location where purgatory is loaded and relocated
+ * This memory can be freed post image load
+ */
+ void *purgatory_buf;
+
+ /* Address where purgatory is finally loaded and is executed from */
+ unsigned long purgatory_load_addr;
+};
+
struct kimage {
kimage_entry_t head;
kimage_entry_t *entry;
@@ -100,7 +133,7 @@ struct kimage {
struct list_head control_pages;
struct list_head dest_pages;
- struct list_head unuseable_pages;
+ struct list_head unusable_pages;
/* Address of next control page to allocate for crash kernels. */
unsigned long control_page;
@@ -110,13 +143,63 @@ struct kimage {
#define KEXEC_TYPE_DEFAULT 0
#define KEXEC_TYPE_CRASH 1
unsigned int preserve_context : 1;
+ /* If set, we are using file mode kexec syscall */
+ unsigned int file_mode:1;
#ifdef ARCH_HAS_KIMAGE_ARCH
struct kimage_arch arch;
#endif
+
+ /* Additional fields for file based kexec syscall */
+ void *kernel_buf;
+ unsigned long kernel_buf_len;
+
+ void *initrd_buf;
+ unsigned long initrd_buf_len;
+
+ char *cmdline_buf;
+ unsigned long cmdline_buf_len;
+
+ /* File operations provided by image loader */
+ struct kexec_file_ops *fops;
+
+ /* Image loader handling the kernel can store a pointer here */
+ void *image_loader_data;
+
+ /* Information for loading purgatory */
+ struct purgatory_info purgatory_info;
};
+/*
+ * Keeps track of buffer parameters as provided by caller for requesting
+ * memory placement of buffer.
+ */
+struct kexec_buf {
+ struct kimage *image;
+ char *buffer;
+ unsigned long bufsz;
+ unsigned long memsz;
+ unsigned long buf_align;
+ unsigned long buf_min;
+ unsigned long buf_max;
+ bool top_down; /* allocate from top of memory hole */
+};
+typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
+typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
+ unsigned long kernel_len, char *initrd,
+ unsigned long initrd_len, char *cmdline,
+ unsigned long cmdline_len);
+typedef int (kexec_cleanup_t)(void *loader_data);
+typedef int (kexec_verify_sig_t)(const char *kernel_buf,
+ unsigned long kernel_len);
+
+struct kexec_file_ops {
+ kexec_probe_t *probe;
+ kexec_load_t *load;
+ kexec_cleanup_t *cleanup;
+ kexec_verify_sig_t *verify_sig;
+};
/* kexec interface functions */
extern void machine_kexec(struct kimage *image);
@@ -127,8 +210,21 @@ extern asmlinkage long sys_kexec_load(unsigned long entry,
struct kexec_segment __user *segments,
unsigned long flags);
extern int kernel_kexec(void);
+extern int kexec_add_buffer(struct kimage *image, char *buffer,
+ unsigned long bufsz, unsigned long memsz,
+ unsigned long buf_align, unsigned long buf_min,
+ unsigned long buf_max, bool top_down,
+ unsigned long *load_addr);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
unsigned int order);
+extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
+ unsigned long max, int top_down,
+ unsigned long *load_addr);
+extern int kexec_purgatory_get_set_symbol(struct kimage *image,
+ const char *name, void *buf,
+ unsigned int size, bool get_value);
+extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
+ const char *name);
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
@@ -177,6 +273,10 @@ extern int kexec_load_disabled;
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
#endif
+/* List of defined/legal kexec file flags */
+#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
+ KEXEC_FILE_NO_INITRAMFS)
+
#define VMCOREINFO_BYTES (4096)
#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)