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/* SPDX-License-Identifier: MIT */
/* SPDX-FileCopyrightText: 2023 Nicholas Chin */
#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);
void 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);
#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
*/
void
ec_fdo_command(enum EC_FDO_CMD arg)
{
write_ec_reg(0x12, arg);
send_ec_cmd(0xb8);
}
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);
}
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