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mb/emulation/qemu-q35: Split smm_close() and smm_lock() 

Change-Id: I6d8efe783e6cc5413c3fd0583574a075a2c3876b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69667
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Kyösti Mälkki 2022-11-11 19:46:05 +02:00
parent 20861b5ad3
commit 2e19aa153a
3 changed files with 27 additions and 12 deletions
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3
src/include/cpu/intel/smm_reloc.h
View File

@ -36,7 +36,8 @@ struct ied_header {
/* These helpers are for performing SMM relocation. */
void northbridge_write_smram(u8 smram);
void smm_open_aseg(void);
void smm_close(void);
void smm_open(void);
void smm_lock(void);
void smm_relocate(void);

6
src/mainboard/emulation/qemu-q35/cpu.c
View File

@ -18,8 +18,7 @@ static void get_smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
smm_subregion(SMM_SUBREGION_HANDLER, perm_smbase, perm_smsize);
if (CONFIG(SMM_ASEG))
smm_open_aseg();
smm_open();
/* FIXME: on X86_64 the save state size is smaller than the size of the SMM stub */
*smm_save_state_size = sizeof(amd64_smm_state_save_area_t);
@ -77,6 +76,9 @@ static void relocation_handler(int cpu, uintptr_t curr_smbase,
static void post_mp_init(void)
{
/* Limit access to SMRAM to SMM module. */
smm_close();
/* Now that all APs have been relocated as well as the BSP let SMIs start flowing. */
global_smi_enable();

30
src/mainboard/emulation/qemu-q35/memmap.c
View File

@ -78,6 +78,26 @@ void smm_region(uintptr_t *start, size_t *size)
printk(BIOS_SPEW, "SMM_BASE: 0x%08lx, SMM_SIZE: %zu MiB\n", *start, *size / MiB);
}
void smm_open(void)
{
/* Set D_OPEN */
if (CONFIG(SMM_ASEG))
pci_write_config8(HOST_BRIDGE, SMRAMC, D_OPEN | G_SMRAME | C_BASE_SEG);
if (CONFIG(SMM_TSEG))
pci_and_config8(HOST_BRIDGE, ESMRAMC, ~T_EN);
}
void smm_close(void)
{
/* Clear D_OPEN */
if (CONFIG(SMM_ASEG))
pci_write_config8(HOST_BRIDGE, SMRAMC, G_SMRAME | C_BASE_SEG);
if (CONFIG(SMM_TSEG))
pci_or_config8(HOST_BRIDGE, ESMRAMC, T_EN);
}
void smm_lock(void)
{
/*
@ -87,13 +107,5 @@ void smm_lock(void)
*/
printk(BIOS_DEBUG, "Locking SMM.\n");
if (CONFIG(SMM_TSEG))
pci_or_config8(HOST_BRIDGE, ESMRAMC, T_EN);
pci_write_config8(PCI_DEV(0, 0, 0), SMRAMC, D_LCK | G_SMRAME | C_BASE_SEG);
}
void smm_open_aseg(void)
{
pci_write_config8(PCI_DEV(0, 0, 0), SMRAMC, G_SMRAME | C_BASE_SEG | D_OPEN);
pci_write_config8(HOST_BRIDGE, SMRAMC, D_LCK | G_SMRAME | C_BASE_SEG);
}