diff options
Diffstat (limited to 'drivers/s390/char/sclp_info.c')
-rw-r--r-- | drivers/s390/char/sclp_info.c | 108 |
1 files changed, 79 insertions, 29 deletions
diff --git a/drivers/s390/char/sclp_info.c b/drivers/s390/char/sclp_info.c index 7bcbe643b08..7d21dbb12fc 100644 --- a/drivers/s390/char/sclp_info.c +++ b/drivers/s390/char/sclp_info.c @@ -11,47 +11,97 @@ #include <asm/sclp.h> #include "sclp.h" -struct sclp_readinfo_sccb s390_readinfo_sccb; +struct sclp_readinfo_sccb { + struct sccb_header header; /* 0-7 */ + u16 rnmax; /* 8-9 */ + u8 rnsize; /* 10 */ + u8 _reserved0[24 - 11]; /* 11-23 */ + u8 loadparm[8]; /* 24-31 */ + u8 _reserved1[48 - 32]; /* 32-47 */ + u64 facilities; /* 48-55 */ + u8 _reserved2[91 - 56]; /* 56-90 */ + u8 flags; /* 91 */ + u8 _reserved3[100 - 92]; /* 92-99 */ + u32 rnsize2; /* 100-103 */ + u64 rnmax2; /* 104-111 */ + u8 _reserved4[4096 - 112]; /* 112-4095 */ +} __attribute__((packed, aligned(4096))); + +static struct sclp_readinfo_sccb __initdata early_readinfo_sccb; +static int __initdata early_readinfo_sccb_valid; void __init sclp_readinfo_early(void) { - sclp_cmdw_t command; - struct sccb_header *sccb; int ret; + int i; + struct sclp_readinfo_sccb *sccb; + sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, + SCLP_CMDW_READ_SCP_INFO}; - __ctl_set_bit(0, 9); /* enable service signal subclass mask */ - - sccb = &s390_readinfo_sccb.header; - command = SCLP_CMDW_READ_SCP_INFO_FORCED; - while (1) { - u16 response; - - memset(&s390_readinfo_sccb, 0, sizeof(s390_readinfo_sccb)); - sccb->length = sizeof(s390_readinfo_sccb); - sccb->control_mask[2] = 0x80; - - ret = sclp_service_call(command, &s390_readinfo_sccb); - - if (ret == -EIO) - goto out; - if (ret == -EBUSY) - continue; + /* Enable service signal subclass mask. */ + __ctl_set_bit(0, 9); + sccb = &early_readinfo_sccb; + for (i = 0; i < ARRAY_SIZE(commands); i++) { + do { + memset(sccb, 0, sizeof(*sccb)); + sccb->header.length = sizeof(*sccb); + sccb->header.control_mask[2] = 0x80; + ret = sclp_service_call(commands[i], sccb); + } while (ret == -EBUSY); + if (ret) + break; __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT | PSW_MASK_WAIT | PSW_DEFAULT_KEY); local_irq_disable(); + /* + * Contents of the sccb might have changed + * therefore a barrier is needed. + */ barrier(); + if (sccb->header.response_code == 0x10) { + early_readinfo_sccb_valid = 1; + break; + } + if (sccb->header.response_code != 0x1f0) + break; + } + /* Disable service signal subclass mask again. */ + __ctl_clear_bit(0, 9); +} - response = sccb->response_code; +unsigned long long __init sclp_memory_detect(void) +{ + unsigned long long memsize; + struct sclp_readinfo_sccb *sccb; - if (response == 0x10) - break; + if (!early_readinfo_sccb_valid) + return 0; + sccb = &early_readinfo_sccb; + if (sccb->rnsize) + memsize = sccb->rnsize << 20; + else + memsize = sccb->rnsize2 << 20; + if (sccb->rnmax) + memsize *= sccb->rnmax; + else + memsize *= sccb->rnmax2; + return memsize; +} - if (response != 0x1f0 || command == SCLP_CMDW_READ_SCP_INFO) - break; +/* + * This function will be called after sclp_memory_detect(), which gets called + * early from early.c code. Therefore the sccb should have valid contents. + */ +void __init sclp_get_ipl_info(struct sclp_ipl_info *info) +{ + struct sclp_readinfo_sccb *sccb; - command = SCLP_CMDW_READ_SCP_INFO; - } -out: - __ctl_clear_bit(0, 9); /* disable service signal subclass mask */ + if (!early_readinfo_sccb_valid) + return; + sccb = &early_readinfo_sccb; + info->is_valid = 1; + if (sccb->flags & 0x2) + info->has_dump = 1; + memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); } |