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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>
151 lines
2.6 KiB
C
151 lines
2.6 KiB
C
/*
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* s390 (re)ipl support
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*
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* Copyright IBM Corp. 2007
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*/
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#ifndef _ASM_S390_IPL_H
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#define _ASM_S390_IPL_H
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#include <asm/types.h>
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#include <asm/cio.h>
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#include <asm/setup.h>
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#define IPL_PARMBLOCK_ORIGIN 0x2000
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#define IPL_PARM_BLK_FCP_LEN (sizeof(struct ipl_list_hdr) + \
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sizeof(struct ipl_block_fcp))
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#define IPL_PARM_BLK0_FCP_LEN (sizeof(struct ipl_block_fcp) + 8)
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#define IPL_PARM_BLK_CCW_LEN (sizeof(struct ipl_list_hdr) + \
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sizeof(struct ipl_block_ccw))
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#define IPL_PARM_BLK0_CCW_LEN (sizeof(struct ipl_block_ccw) + 8)
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#define IPL_MAX_SUPPORTED_VERSION (0)
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#define IPL_PARMBLOCK_START ((struct ipl_parameter_block *) \
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IPL_PARMBLOCK_ORIGIN)
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#define IPL_PARMBLOCK_SIZE (IPL_PARMBLOCK_START->hdr.len)
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struct ipl_list_hdr {
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u32 len;
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u8 reserved1[3];
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u8 version;
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u32 blk0_len;
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u8 pbt;
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u8 flags;
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u16 reserved2;
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} __attribute__((packed));
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struct ipl_block_fcp {
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u8 reserved1[313-1];
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u8 opt;
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u8 reserved2[3];
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u16 reserved3;
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u16 devno;
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u8 reserved4[4];
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u64 wwpn;
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u64 lun;
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u32 bootprog;
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u8 reserved5[12];
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u64 br_lba;
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u32 scp_data_len;
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u8 reserved6[260];
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u8 scp_data[];
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} __attribute__((packed));
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struct ipl_block_ccw {
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u8 load_param[8];
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u8 reserved1[84];
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u8 reserved2[2];
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u16 devno;
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u8 vm_flags;
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u8 reserved3[3];
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u32 vm_parm_len;
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u8 reserved4[80];
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} __attribute__((packed));
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struct ipl_parameter_block {
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struct ipl_list_hdr hdr;
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union {
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struct ipl_block_fcp fcp;
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struct ipl_block_ccw ccw;
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} ipl_info;
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} __attribute__((packed));
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/*
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* IPL validity flags
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*/
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extern u32 ipl_flags;
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extern u32 dump_prefix_page;
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extern void do_reipl(void);
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extern void ipl_save_parameters(void);
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enum {
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IPL_DEVNO_VALID = 1,
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IPL_PARMBLOCK_VALID = 2,
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IPL_NSS_VALID = 4,
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};
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enum ipl_type {
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IPL_TYPE_UNKNOWN = 1,
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IPL_TYPE_CCW = 2,
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IPL_TYPE_FCP = 4,
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IPL_TYPE_FCP_DUMP = 8,
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IPL_TYPE_NSS = 16,
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};
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struct ipl_info
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{
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enum ipl_type type;
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union {
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struct {
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struct ccw_dev_id dev_id;
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} ccw;
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struct {
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struct ccw_dev_id dev_id;
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u64 wwpn;
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u64 lun;
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} fcp;
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struct {
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char name[NSS_NAME_SIZE + 1];
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} nss;
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} data;
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};
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extern struct ipl_info ipl_info;
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extern void setup_ipl_info(void);
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/*
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* DIAG 308 support
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*/
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enum diag308_subcode {
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DIAG308_REL_HSA = 2,
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DIAG308_IPL = 3,
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DIAG308_DUMP = 4,
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DIAG308_SET = 5,
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DIAG308_STORE = 6,
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};
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enum diag308_ipl_type {
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DIAG308_IPL_TYPE_FCP = 0,
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DIAG308_IPL_TYPE_CCW = 2,
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};
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enum diag308_opt {
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DIAG308_IPL_OPT_IPL = 0x10,
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DIAG308_IPL_OPT_DUMP = 0x20,
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};
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enum diag308_rc {
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DIAG308_RC_OK = 1,
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};
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extern int diag308(unsigned long subcode, void *addr);
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#endif /* _ASM_S390_IPL_H */
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