diff options
Diffstat (limited to 'util/e6400-flash-unlock/e6400_flash_unlock.c')
| -rw-r--r-- | util/e6400-flash-unlock/e6400_flash_unlock.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/util/e6400-flash-unlock/e6400_flash_unlock.c b/util/e6400-flash-unlock/e6400_flash_unlock.c new file mode 100644 index 00000000..88ba2e98 --- /dev/null +++ b/util/e6400-flash-unlock/e6400_flash_unlock.c @@ -0,0 +1,169 @@ +/* + * Copyright (c) 2023 Nicholas Chin + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include <sys/io.h> +#include <sys/mman.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> + +enum +EC_FDO_CMD { + QUERY = 0, + SET_OVERRIDE = 2, + UNSET_OVERRIDE = 3 +}; + +int get_fdo_status(void); +uint8_t ec_fdo_command(enum EC_FDO_CMD arg); +void write_ec_reg(uint8_t index, uint8_t data); +void send_ec_cmd(uint8_t cmd); +void wait_ec(void); +int get_gbl_smi_en(void); +int set_gbl_smi_en(int enable); +/* uint8_t read_ec_reg(uint8_t index); */ + +#define EC_INDEX 0x910 +#define EC_DATA 0x911 +#define PMBASE 0x1000 +#define SMI_EN_REG (PMBASE + 0x30) + +/* Assume this is the same on all vendor BIOS versions */ +#define RCBA 0xfed18000 + +#define RCBA_MMIO_LEN 0x4000 +#define SPIBAR 0x3800 +#define HSFS_REG 0x04 + +volatile uint8_t *rcba_mmio; + +int +main(int argc, char *argv[]) +{ + int devmemfd; + (void)argc; + (void)argv; + + if ((ioperm(EC_INDEX, 2, 1) == -1) || (ioperm(SMI_EN_REG, 4, 1) == -1)) + err(errno, "Could not access IO ports"); + if ((devmemfd = open("/dev/mem", O_RDONLY)) == -1) + err(errno, "/dev/mem"); + + /* FDO pin-strap status bit is in RCBA mmio space */ + rcba_mmio = mmap(0, RCBA_MMIO_LEN, PROT_READ, MAP_SHARED, devmemfd, + RCBA); + if (rcba_mmio == MAP_FAILED) + err(errno, "Could not map RCBA"); + + if (get_fdo_status() == 1) { + ec_fdo_command(SET_OVERRIDE); + printf("Flash Descriptor Override enabled. Shut down now. The " + "EC will auto-boot the system and set the override.\n" + "Upon boot, re-run this utility to unlock flash.\n"); + } else if (get_gbl_smi_en()){ + set_gbl_smi_en(0); + printf("SMIs disabled. Internal flashing should work now.\n" + "After flashing, re-run this utility to enable SMIs.\n" + "(shutdown is buggy when SMIs are disabled)\n"); + } else { + set_gbl_smi_en(1); + printf("SMIs enabled, you can now shutdown the system.\n"); + } + return errno; +} + +int +get_fdo_status(void) +{ + return (*(uint16_t*)(rcba_mmio + SPIBAR + HSFS_REG) >> 13) & 1; +} + +/* + * arg: + * 0 = Query EC FDO status - TODO + * 2 = Enable FDO for next boot + * 3 = Disable FDO for next boot - TODO + */ +uint8_t +ec_fdo_command(enum EC_FDO_CMD arg) +{ + write_ec_reg(0x12, arg); + send_ec_cmd(0xb8); + return 1; +} + +void +write_ec_reg(uint8_t index, uint8_t data) +{ + outb(index, EC_INDEX); + outb(data, EC_DATA); +} + +void +send_ec_cmd(uint8_t cmd) +{ + outb(0, EC_INDEX); + outb(cmd, EC_DATA); + wait_ec(); +} + +void +wait_ec(void) +{ + uint8_t busy; + do { + outb(0, EC_INDEX); + busy = inb(EC_DATA); + } while (busy); +} + +int +get_gbl_smi_en(void) +{ + return inl(SMI_EN_REG) & 1; +} + +int +set_gbl_smi_en(int enable) +{ + uint32_t smi_en = inl(SMI_EN_REG); + if (enable) { + smi_en |= 1; + } else { + smi_en &= ~1; + } + outl(smi_en, SMI_EN_REG); + return (get_gbl_smi_en() == enable); +} + +/* +uint8_t +read_ec_reg(uint8_t index) +{ + outb(index, EC_INDEX); + return inb(EC_DATA); +} +*/ |