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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2012-03-11 16:59:34 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-03-11 16:59:29 +0100
commit4857d4bbe9821c8d732cb84455e18e12b3d79add (patch)
tree54583e3ef5c84c04f92b7b15ea6aad8224781d9b /arch/s390/include/asm/os_info.h
parent[S390] Use block_sigmask() (diff)
downloadlinux-4857d4bbe9821c8d732cb84455e18e12b3d79add.tar.xz
linux-4857d4bbe9821c8d732cb84455e18e12b3d79add.zip
[S390] kernel: Add OS info memory interface
In order to allow kdump based stand-alone dump, some information has to be passed from the old kernel to the new dump kernel. This is done via a the struct "os_info" that contains the following fields: * crashkernel base and size * reipl block * vmcoreinfo * init function A pointer to os_info is stored at a well known storage location and the whole structure as well as all fields are secured with checksums. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/os_info.h')
-rw-r--r--arch/s390/include/asm/os_info.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/s390/include/asm/os_info.h b/arch/s390/include/asm/os_info.h
new file mode 100644
index 000000000000..d07518af09ea
--- /dev/null
+++ b/arch/s390/include/asm/os_info.h
@@ -0,0 +1,50 @@
+/*
+ * OS info memory interface
+ *
+ * Copyright IBM Corp. 2012
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+#ifndef _ASM_S390_OS_INFO_H
+#define _ASM_S390_OS_INFO_H
+
+#define OS_INFO_VERSION_MAJOR 1
+#define OS_INFO_VERSION_MINOR 1
+#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
+
+#define OS_INFO_VMCOREINFO 0
+#define OS_INFO_REIPL_BLOCK 1
+#define OS_INFO_INIT_FN 2
+
+struct os_info_entry {
+ u64 addr;
+ u64 size;
+ u32 csum;
+} __packed;
+
+struct os_info {
+ u64 magic;
+ u32 csum;
+ u16 version_major;
+ u16 version_minor;
+ u64 crashkernel_addr;
+ u64 crashkernel_size;
+ struct os_info_entry entry[3];
+ u8 reserved[4004];
+} __packed;
+
+void os_info_init(void);
+void os_info_entry_add(int nr, void *ptr, u64 len);
+void os_info_crashkernel_add(unsigned long base, unsigned long size);
+u32 os_info_csum(struct os_info *os_info);
+
+#ifdef CONFIG_CRASH_DUMP
+void *os_info_old_entry(int nr, unsigned long *size);
+int copy_from_oldmem(void *dest, void *src, size_t count);
+#else
+static inline void *os_info_old_entry(int nr, unsigned long *size)
+{
+ return NULL;
+}
+#endif
+
+#endif /* _ASM_S390_OS_INFO_H */