diff options
Diffstat (limited to 'arch/s390/boot/ipl_parm.c')
| -rw-r--r-- | arch/s390/boot/ipl_parm.c | 66 |
1 files changed, 64 insertions, 2 deletions
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c index 9dab596be98e..36beb56de021 100644 --- a/arch/s390/boot/ipl_parm.c +++ b/arch/s390/boot/ipl_parm.c @@ -1,10 +1,12 @@ // SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> #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 <asm/facility.h> #include "boot.h" char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; @@ -143,8 +145,66 @@ void setup_boot_command_line(void) append_ipl_block_parm(); } +static void modify_facility(unsigned long nr, bool clear) +{ + if (clear) + __clear_facility(nr, S390_lowcore.stfle_fac_list); + else + __set_facility(nr, S390_lowcore.stfle_fac_list); +} + +static void check_cleared_facilities(void) +{ + unsigned long als[] = { FACILITIES_ALS }; + int i; + + for (i = 0; i < ARRAY_SIZE(als); i++) { + if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) { + sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); + print_missing_facilities(); + break; + } + } +} + +static void modify_fac_list(char *str) +{ + unsigned long val, endval; + char *endp; + bool clear; + + while (*str) { + clear = false; + if (*str == '!') { + clear = true; + str++; + } + val = simple_strtoull(str, &endp, 0); + if (str == endp) + break; + str = endp; + if (*str == '-') { + str++; + endval = simple_strtoull(str, &endp, 0); + if (str == endp) + break; + str = endp; + while (val <= endval) { + modify_facility(val, clear); + val++; + } + } else { + modify_facility(val, clear); + } + if (*str != ',') + break; + str++; + } + check_cleared_facilities(); +} + static char command_line_buf[COMMAND_LINE_SIZE] __section(.data); -static void parse_mem_opt(void) +void parse_boot_command_line(void) { char *param, *val; bool enabled; @@ -165,12 +225,14 @@ static void parse_mem_opt(void) if (!rc && !enabled) noexec_disabled = 1; } + + if (!strcmp(param, "facilities")) + modify_fac_list(val); } } 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 && |