411ed32257
s390 machines provide hardware support for creating Linux dumps on SCSI disks. For creating a dump a special purpose dump Linux is used. The first 32 MB of memory are saved by the hardware before the dump Linux is booted. Via an SCLP interface, the saved memory can be accessed from Linux. This patch exports memory and registers of the crashed Linux to userspace via a debugfs file. For more information refer to Documentation/s390/zfcpdump.txt, which is included in this patch. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* include/asm-s390/sclp.h
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*
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* Copyright IBM Corp. 2007
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#ifndef _ASM_S390_SCLP_H
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#define _ASM_S390_SCLP_H
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#include <linux/types.h>
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#include <asm/chpid.h>
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struct sccb_header {
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u16 length;
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u8 function_code;
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u8 control_mask[3];
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u16 response_code;
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} __attribute__((packed));
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#define LOADPARM_LEN 8
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struct sclp_readinfo_sccb {
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struct sccb_header header; /* 0-7 */
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u16 rnmax; /* 8-9 */
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u8 rnsize; /* 10 */
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u8 _reserved0[24 - 11]; /* 11-23 */
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u8 loadparm[LOADPARM_LEN]; /* 24-31 */
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u8 _reserved1[91 - 32]; /* 32-90 */
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u8 flags; /* 91 */
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u8 _reserved2[100 - 92]; /* 92-99 */
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u32 rnsize2; /* 100-103 */
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u64 rnmax2; /* 104-111 */
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u8 _reserved3[4096 - 112]; /* 112-4095 */
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} __attribute__((packed, aligned(4096)));
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#define SCLP_CHP_INFO_MASK_SIZE 32
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struct sclp_chp_info {
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u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
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u8 standby[SCLP_CHP_INFO_MASK_SIZE];
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u8 configured[SCLP_CHP_INFO_MASK_SIZE];
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};
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extern struct sclp_readinfo_sccb s390_readinfo_sccb;
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extern void sclp_readinfo_early(void);
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extern int sclp_sdias_blk_count(void);
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extern int sclp_sdias_copy(void *dest, int blk_num, int nr_blks);
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extern int sclp_chp_configure(struct chp_id chpid);
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extern int sclp_chp_deconfigure(struct chp_id chpid);
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extern int sclp_chp_read_info(struct sclp_chp_info *info);
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#endif /* _ASM_S390_SCLP_H */
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