diff options
| author |   Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2012-03-11 11:59:34 -0400 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-03-11 11:59:29 -0400 |
| commit | 4857d4bbe9821c8d732cb84455e18e12b3d79add (patch) | |
| tree | 54583e3ef5c84c04f92b7b15ea6aad8224781d9b /arch/s390/include | |
| parent | [S390] Use block_sigmask() (diff) | |
| download | linux-dev-4857d4bbe9821c8d732cb84455e18e12b3d79add.tar.xz linux-dev-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')
| -rw-r--r-- | arch/s390/include/asm/lowcore.h | 8 | ||||
| -rw-r--r-- | arch/s390/include/asm/os_info.h | 50 |
2 files changed, 56 insertions, 2 deletions
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 4e69563bc956..a47c6e221a95 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -154,7 +154,9 @@ struct _lowcore { __u32 ipib; /* 0x0e00 */ __u32 ipib_checksum; /* 0x0e04 */ __u32 vmcore_info; /* 0x0e08 */ - __u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */ + __u8 pad_0x0e0c[0x0e18-0x0e0c]; /* 0x0e0c */ + __u32 os_info; /* 0x0e18 */ + __u8 pad_0x0e1c[0x0f00-0x0e1c]; /* 0x0e1c */ /* Extended facility list */ __u64 stfle_fac_list[32]; /* 0x0f00 */ @@ -301,7 +303,9 @@ struct _lowcore { __u64 ipib; /* 0x0e00 */ __u32 ipib_checksum; /* 0x0e08 */ __u64 vmcore_info; /* 0x0e0c */ - __u8 pad_0x0e14[0x0f00-0x0e14]; /* 0x0e14 */ + __u8 pad_0x0e14[0x0e18-0x0e14]; /* 0x0e14 */ + __u64 os_info; /* 0x0e18 */ + __u8 pad_0x0e20[0x0f00-0x0e20]; /* 0x0e20 */ /* Extended facility list */ __u64 stfle_fac_list[32]; /* 0x0f00 */ 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 */ |