diff options
Diffstat (limited to 'cmd/x86')
| -rw-r--r-- | cmd/x86/Makefile | 1 | ||||
| -rw-r--r-- | cmd/x86/cbcmos.c | 139 | ||||
| -rw-r--r-- | cmd/x86/cbsysinfo.c | 73 |
3 files changed, 212 insertions, 1 deletions
diff --git a/cmd/x86/Makefile b/cmd/x86/Makefile index 925215235d3..5f3f5be2882 100644 --- a/cmd/x86/Makefile +++ b/cmd/x86/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_CMD_CBSYSINFO) += cbsysinfo.o obj-y += cpuid.o msr.o mtrr.o +obj-$(CONFIG_CMD_CBCMOS) += cbcmos.o obj-$(CONFIG_CMD_EXCEPTION) += exception.o obj-$(CONFIG_USE_HOB) += hob.o obj-$(CONFIG_HAVE_FSP) += fsp.o diff --git a/cmd/x86/cbcmos.c b/cmd/x86/cbcmos.c new file mode 100644 index 00000000000..fe5582fbf51 --- /dev/null +++ b/cmd/x86/cbcmos.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Support for booting from coreboot + * + * Copyright 2021 Google LLC + */ + +#define LOG_CATEGORY UCLASS_RTC + +#include <command.h> +#include <dm.h> +#include <rtc.h> +#include <asm/cb_sysinfo.h> +#include <asm/global_data.h> + +DECLARE_GLOBAL_DATA_PTR; + +const struct sysinfo_t *get_table(void) +{ + if (!gd->arch.coreboot_table) { + printf("No coreboot sysinfo table found\n"); + return NULL; + } + + return &lib_sysinfo; +} + +static int calc_sum(struct udevice *dev, uint start_bit, uint bit_count) +{ + uint start_byte = start_bit / 8; + uint byte_count = bit_count / 8; + int ret, i; + uint sum; + + log_debug("Calc sum from %x: %x bytes\n", start_byte, byte_count); + sum = 0; + for (i = 0; i < bit_count / 8; i++) { + ret = rtc_read8(dev, start_bit / 8 + i); + if (ret < 0) + return ret; + sum += ret; + } + + return (sum & 0xff) << 8 | (sum & 0xff00) >> 8; +} + +/** + * prep_cbcmos() - Prepare for a CMOS-RAM command + * + * @tab: coreboot table + * @devnum: RTC device name to use, or NULL for the first one + * @dep: Returns RTC device on success + * Return: calculated checksum for CMOS RAM or -ve on error + */ +static int prep_cbcmos(const struct sysinfo_t *tab, const char *devname, + struct udevice **devp) +{ + struct udevice *dev; + int ret; + + if (!tab) + return CMD_RET_FAILURE; + if (devname) + ret = uclass_get_device_by_name(UCLASS_RTC, devname, &dev); + else + ret = uclass_first_device_err(UCLASS_RTC, &dev); + if (ret) { + printf("Failed to get RTC device: %dE\n", ret); + return ret; + } + + ret = calc_sum(dev, tab->cmos_range_start, + tab->cmos_range_end + 1 - tab->cmos_range_start); + if (ret < 0) { + printf("Failed to read RTC device: %dE\n", ret); + return ret; + } + *devp = dev; + + return ret; +} + +static int do_cbcmos_check(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + const struct sysinfo_t *tab = get_table(); + struct udevice *dev; + u16 cur, sum; + int ret; + + ret = prep_cbcmos(tab, argv[1], &dev); + if (ret < 0) + return CMD_RET_FAILURE; + sum = ret; + + ret = rtc_read16(dev, tab->cmos_checksum_location / 8, &cur); + if (ret < 0) { + printf("Failed to read RTC device: %dE\n", ret); + return CMD_RET_FAILURE; + } + if (sum != cur) { + printf("Checksum %04x error: calculated %04x\n", cur, sum); + return CMD_RET_FAILURE; + } + + return 0; +} + +static int do_cbcmos_update(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + const struct sysinfo_t *tab = get_table(); + struct udevice *dev; + u16 sum; + int ret; + + ret = prep_cbcmos(tab, argv[1], &dev); + if (ret < 0) + return CMD_RET_FAILURE; + sum = ret; + + ret = rtc_write16(dev, tab->cmos_checksum_location / 8, sum); + if (ret < 0) { + printf("Failed to read RTC device: %dE\n", ret); + return CMD_RET_FAILURE; + } + printf("Checksum %04x written\n", sum); + + return 0; +} + +U_BOOT_LONGHELP(cbcmos, + "check - check CMOS RAM\n" + "cbcmos update - Update CMOS-RAM checksum"; +); + +U_BOOT_CMD_WITH_SUBCMDS(cbcmos, "coreboot CMOS RAM", cbcmos_help_text, + U_BOOT_SUBCMD_MKENT(check, 2, 1, do_cbcmos_check), + U_BOOT_SUBCMD_MKENT(update, 2, 1, do_cbcmos_update)); diff --git a/cmd/x86/cbsysinfo.c b/cmd/x86/cbsysinfo.c index 7ca2e13ae2f..ea4d89616f6 100644 --- a/cmd/x86/cbsysinfo.c +++ b/cmd/x86/cbsysinfo.c @@ -184,6 +184,77 @@ static const char *timestamp_name(uint32_t id) return "<unknown>"; } +static void show_option_vals(const struct cb_cmos_option_table *tab, + uint id) +{ + const void *ptr, *end; + bool found = false; + + end = (void *)tab + tab->size; + for (ptr = (void *)tab + tab->header_length; ptr < end;) { + const struct cb_record *rec = ptr; + + switch (rec->tag) { + case CB_TAG_OPTION_ENUM: { + const struct cb_cmos_enums *enums = ptr; + + if (enums->config_id == id) { + if (!found) + printf(" "); + printf(" %d:%s", enums->value, enums->text); + found = true; + } + break; + } + break; + case CB_TAG_OPTION_DEFAULTS: + case CB_TAG_OPTION_CHECKSUM: + case CB_TAG_OPTION: + break; + default: + printf("tag %x\n", rec->tag); + break; + } + ptr += rec->size; + } +} + +static void show_option_table(const struct cb_cmos_option_table *tab) +{ + const void *ptr, *end; + + print_ptr("option_table", tab); + if (!tab->size) + return; + + printf(" Bit Len Cfg ID Name\n"); + end = (void *)tab + tab->size; + for (ptr = (void *)tab + tab->header_length; ptr < end;) { + const struct cb_record *rec = ptr; + + switch (rec->tag) { + case CB_TAG_OPTION: { + const struct cb_cmos_entries *entry = ptr; + + printf("%4x %4x %3c %3x %-20s", entry->bit, + entry->length, entry->config, entry->config_id, + entry->name); + show_option_vals(tab, entry->config_id); + printf("\n"); + break; + } + case CB_TAG_OPTION_ENUM: + case CB_TAG_OPTION_DEFAULTS: + case CB_TAG_OPTION_CHECKSUM: + break; + default: + printf("tag %x\n", rec->tag); + break; + } + ptr += rec->size; + } +} + static void show_table(struct sysinfo_t *info, bool verbose) { struct cb_serial *ser = info->serial; @@ -218,7 +289,7 @@ static void show_table(struct sysinfo_t *info, bool verbose) printf("%12d: %02x:%-8s %016llx %016llx\n", i, mr->type, get_mem_name(mr->type), mr->base, mr->size); } - print_ptr("option_table", info->option_table); + show_option_table(info->option_table); print_hex("CMOS start", info->cmos_range_start); if (info->cmos_range_start) { |