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Diffstat (limited to 'util/e6400-flash-unlock/e6400_flash_unlock.c')
-rw-r--r--util/e6400-flash-unlock/e6400_flash_unlock.c169
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);
+}
+*/