diff options
| -rw-r--r-- | src/soc/amd/common/block/psp/psp_smm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/psp/psp_smm.c b/src/soc/amd/common/block/psp/psp_smm.c index 114cf12add..eecdf02be7 100644 --- a/src/soc/amd/common/block/psp/psp_smm.c +++ b/src/soc/amd/common/block/psp/psp_smm.c @@ -47,6 +47,13 @@ static void clear_smm_flag(void) smm_flag = 0; } +/* + * The MBOX_BIOS_CMD_SMM_INFO PSP mailbox command doesn't necessarily need be sent from SMM, + * but doing so allows the linker to sort out the addresses of c2p_buffer, p2c_buffer and + * smm_flag without us needing to pass this info between ramstage and smm. In the PSP gen2 case + * this will also make sure that the PSP MMIO base will be cached in SMM before the OS takes + * over so no SMN accesses will be needed during OS runtime. + */ int psp_notify_smm(void) { msr_t msr; |