diff options
Diffstat (limited to 'arch/s390/boot/ipl_parm.c')
| -rw-r--r-- | arch/s390/boot/ipl_parm.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c new file mode 100644 index 000000000000..9dab596be98e --- /dev/null +++ b/arch/s390/boot/ipl_parm.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/ctype.h> +#include <asm/ebcdic.h> +#include <asm/sclp.h> +#include <asm/sections.h> +#include <asm/boot_data.h> +#include "boot.h" + +char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; +struct ipl_parameter_block __bootdata(early_ipl_block); +int __bootdata(early_ipl_block_valid); + +unsigned long __bootdata(memory_end); +int __bootdata(memory_end_set); +int __bootdata(noexec_disabled); + +static inline int __diag308(unsigned long subcode, void *addr) +{ + register unsigned long _addr asm("0") = (unsigned long)addr; + register unsigned long _rc asm("1") = 0; + unsigned long reg1, reg2; + psw_t old = S390_lowcore.program_new_psw; + + asm volatile( + " epsw %0,%1\n" + " st %0,%[psw_pgm]\n" + " st %1,%[psw_pgm]+4\n" + " larl %0,1f\n" + " stg %0,%[psw_pgm]+8\n" + " diag %[addr],%[subcode],0x308\n" + "1: nopr %%r7\n" + : "=&d" (reg1), "=&a" (reg2), + [psw_pgm] "=Q" (S390_lowcore.program_new_psw), + [addr] "+d" (_addr), "+d" (_rc) + : [subcode] "d" (subcode) + : "cc", "memory"); + S390_lowcore.program_new_psw = old; + return _rc; +} + +void store_ipl_parmblock(void) +{ + int rc; + + rc = __diag308(DIAG308_STORE, &early_ipl_block); + if (rc == DIAG308_RC_OK && + early_ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) + early_ipl_block_valid = 1; +} + +static size_t scpdata_length(const char *buf, size_t count) +{ + while (count) { + if (buf[count - 1] != '\0' && buf[count - 1] != ' ') + break; + count--; + } + return count; +} + +static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, + const struct ipl_parameter_block *ipb) +{ + size_t count; + size_t i; + int has_lowercase; + + count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data, + ipb->ipl_info.fcp.scp_data_len)); + if (!count) + goto out; + + has_lowercase = 0; + for (i = 0; i < count; i++) { + if (!isascii(ipb->ipl_info.fcp.scp_data[i])) { + count = 0; + goto out; + } + if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i])) + has_lowercase = 1; + } + + if (has_lowercase) + memcpy(dest, ipb->ipl_info.fcp.scp_data, count); + else + for (i = 0; i < count; i++) + dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]); +out: + dest[count] = '\0'; + return count; +} + +static void append_ipl_block_parm(void) +{ + char *parm, *delim; + size_t len, rc = 0; + + len = strlen(early_command_line); + + delim = early_command_line + len; /* '\0' character position */ + parm = early_command_line + len + 1; /* append right after '\0' */ + + switch (early_ipl_block.hdr.pbt) { + case DIAG308_IPL_TYPE_CCW: + rc = ipl_block_get_ascii_vmparm( + parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block); + break; + case DIAG308_IPL_TYPE_FCP: + rc = ipl_block_get_ascii_scpdata( + parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block); + break; + } + if (rc) { + if (*parm == '=') + memmove(early_command_line, parm + 1, rc); + else + *delim = ' '; /* replace '\0' with space */ + } +} + +static inline int has_ebcdic_char(const char *str) +{ + int i; + + for (i = 0; str[i]; i++) + if (str[i] & 0x80) + return 1; + return 0; +} + +void setup_boot_command_line(void) +{ + COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; + /* convert arch command line to ascii if necessary */ + if (has_ebcdic_char(COMMAND_LINE)) + EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); + /* copy arch command line */ + strcpy(early_command_line, strim(COMMAND_LINE)); + + /* append IPL PARM data to the boot command line */ + if (early_ipl_block_valid) + append_ipl_block_parm(); +} + +static char command_line_buf[COMMAND_LINE_SIZE] __section(.data); +static void parse_mem_opt(void) +{ + char *param, *val; + bool enabled; + char *args; + int rc; + + args = strcpy(command_line_buf, early_command_line); + while (*args) { + args = next_arg(args, ¶m, &val); + + if (!strcmp(param, "mem")) { + memory_end = memparse(val, NULL); + memory_end_set = 1; + } + + if (!strcmp(param, "noexec")) { + rc = kstrtobool(val, &enabled); + if (!rc && !enabled) + noexec_disabled = 1; + } + } +} + +void setup_memory_end(void) +{ + parse_mem_opt(); +#ifdef CONFIG_CRASH_DUMP + if (!OLDMEM_BASE && early_ipl_block_valid && + early_ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP && + early_ipl_block.ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP) { + if (!sclp_early_get_hsa_size(&memory_end) && memory_end) + memory_end_set = 1; + } +#endif +} |