diff options
Diffstat (limited to 'src/cpu/x86/smm/smihandler.c')
| -rw-r--r-- | src/cpu/x86/smm/smihandler.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/cpu/x86/smm/smihandler.c b/src/cpu/x86/smm/smihandler.c index 3dddf6c8ae..bdaedf8dbc 100644 --- a/src/cpu/x86/smm/smihandler.c +++ b/src/cpu/x86/smm/smihandler.c @@ -87,6 +87,24 @@ static void smi_set_eos(void) southbridge_smi_set_eos(); } +static u32 pci_orig; + +/** + * @brief Backup PCI address to make sure we do not mess up the OS + */ +static void smi_backup_pci_address(void) +{ + pci_orig = inl(0xcf8); +} + +/** + * @brief Restore PCI address previously backed up + */ +static void smi_restore_pci_address(void) +{ + outl(pci_orig, 0xcf8); +} + /** * @brief Interrupt handler for SMI# * @@ -107,6 +125,8 @@ void smi_handler(u32 smm_revision) return; } + smi_backup_pci_address(); + node=nodeid(); console_init(); @@ -147,6 +167,8 @@ void smi_handler(u32 smm_revision) if (southbridge_smi_handler) southbridge_smi_handler(node, &state_save); + smi_restore_pci_address(); + smi_release_lock(); /* De-assert SMI# signal to allow another SMI */ |