e6cd6caf31
This change provides hooks for the SoC so it can perform any initialization and cleanup in the SMM handler. For example, if we have a UART enabled firmware with DEBUG_SMI, the UART controller could have been powered off by the OS. In this case we need to power on the UART when entering SMM, and then power it off before we exit. If the OS had the UART enabled when entering SMM, we should snapshot the UART register state, and restore it on exit. Otherwise we risk clearing some interrupt enable bits. BUG=b:221231786, b:217968734 TEST=Build test guybrush Signed-off-by: Raul E Rangel <rrangel@chromium.org> Change-Id: I946619cd62a974a98c575a92943b43ea639fc329 Reviewed-on: https://review.coreboot.org/c/coreboot/+/62500 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Karthik Ramasubramanian <kramasub@google.com> |
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|---|---|---|
| .. | ||
| 64bit | ||
| lapic | ||
| mtrr | ||
| name | ||
| pae | ||
| smm | ||
| tsc | ||
| backup_default_smm.c | ||
| cpu_info.S.inc | ||
| early_reset.S | ||
| entry16.S | ||
| entry32.S | ||
| fpu_enable.inc | ||
| Kconfig | ||
| Kconfig.debug_cpu | ||
| Makefile.inc | ||
| mp_init.c | ||
| reset16.S | ||
| sipi_vector.S | ||
| smi_trigger.c | ||
| sse_enable.inc | ||