diff options
| author | Subrata Banik <subratabanik@google.com> | 2022-06-15 21:24:13 +0530 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-06-22 12:35:53 +0000 |
| commit | bd0aef0f2a9a9cee1258aa22e026f1b6054c3d64 (patch) | |
| tree | f5cdd186d540ff8ef63c7ce58816d5e1544825dc /src/cpu | |
| parent | d36aca5e22d3c5410c953af7a8e9db9ec86082bb (diff) | |
cpu/intel/microcode: Have API to re-load microcode patch
This patch introduces a newer API to reload the microcode patch when
SoC selects RELOAD_MICROCODE_PATCH config.
Expected to call this API being independent of CPU MP Init regular
flow hence, doesn't regress the boot time.
BUG=b:233199592
TEST=Build and boot google/kano to ChromeOS.
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: If480e44b88d04e5cb25d7104961b70f7be041a23
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65156
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/microcode/microcode.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c index 469bd25496..5ed6190e26 100644 --- a/src/cpu/intel/microcode/microcode.c +++ b/src/cpu/intel/microcode/microcode.c @@ -250,6 +250,38 @@ void intel_update_microcode_from_cbfs(void) spin_unlock(µcode_lock); } +void intel_reload_microcode(void) +{ + if (!CONFIG(RELOAD_MICROCODE_PATCH)) + return; + + u32 current_rev; + msr_t msr; + const struct microcode *m = intel_microcode_find(); + + if (!m) { + printk(BIOS_ERR, "microcode: failed because no ucode was found\n"); + return; + } + + printk(BIOS_INFO, "microcode: Re-load microcode patch\n"); + + msr.lo = (unsigned long)m + sizeof(struct microcode); + msr.hi = 0; + wrmsr(IA32_BIOS_UPDT_TRIG, msr); + + current_rev = read_microcode_rev(); + if (current_rev == m->rev) { + printk(BIOS_INFO, "microcode: updated to revision " + "0x%x date=%04x-%02x-%02x\n", read_microcode_rev(), + m->date & 0xffff, (m->date >> 24) & 0xff, + (m->date >> 16) & 0xff); + return; + } + + printk(BIOS_ERR, "microcode: Re-load failed\n"); +} + #if ENV_RAMSTAGE __weak int soc_skip_ucode_update(u32 current_patch_id, u32 new_patch_id) |