extern u8 smm_relocation_start, smm_relocation_end;
extern u8 smm_code_start, smm_code_end;
-void
-smm_init()
+static void
+smm_save_and_copy(void)
{
- if (CONFIG_COREBOOT)
- // SMM only supported on emulators.
- return;
- if (!CONFIG_USE_SMM)
- return;
-
- dprintf(3, "init smm\n");
-
- // This code is hardcoded for PIIX4 Power Management device.
- int bdf = pci_find_device(PCI_VENDOR_ID_INTEL
- , PCI_DEVICE_ID_INTEL_82371AB_3);
- if (bdf < 0)
- // Device not found
- return;
- int i440_bdf = pci_find_device(PCI_VENDOR_ID_INTEL
- , PCI_DEVICE_ID_INTEL_82441);
- if (i440_bdf < 0)
- return;
-
- /* check if SMM init is already done */
- u32 value = pci_config_readl(bdf, 0x58);
- if (value & (1 << 25))
- return;
-
- /* enable the SMM memory window */
- pci_config_writeb(i440_bdf, 0x72, 0x02 | 0x48);
-
/* save original memory content */
memcpy((void *)BUILD_SMM_ADDR, (void *)BUILD_SMM_INIT_ADDR, BUILD_SMM_SIZE);
/* copy the SMM relocation code */
memcpy((void *)BUILD_SMM_INIT_ADDR, &smm_relocation_start,
&smm_relocation_end - &smm_relocation_start);
+}
- /* enable SMI generation when writing to the APMC register */
- pci_config_writel(bdf, 0x58, value | (1 << 25));
-
+static void
+smm_relocate_and_restore(void)
+{
/* init APM status port */
outb(0x01, PORT_SMI_STATUS);
memcpy((void *)BUILD_SMM_ADDR, &smm_code_start
, &smm_code_end - &smm_code_start);
wbinvd();
+}
+
+#define I440FX_SMRAM 0x72
+#define PIIX_DEVACTB 0x58
+#define PIIX_APMC_EN (1 << 25)
+
+// This code is hardcoded for PIIX4 Power Management device.
+static void piix4_apmc_smm_init(struct pci_device *pci, void *arg)
+{
+ struct pci_device *i440_pci = pci_find_device(PCI_VENDOR_ID_INTEL
+ , PCI_DEVICE_ID_INTEL_82441);
+ if (!i440_pci)
+ return;
+
+ /* check if SMM init is already done */
+ u32 value = pci_config_readl(pci->bdf, PIIX_DEVACTB);
+ if (value & PIIX_APMC_EN)
+ return;
+
+ /* enable the SMM memory window */
+ pci_config_writeb(i440_pci->bdf, I440FX_SMRAM, 0x02 | 0x48);
+
+ smm_save_and_copy();
+
+ /* enable SMI generation when writing to the APMC register */
+ pci_config_writel(pci->bdf, PIIX_DEVACTB, value | PIIX_APMC_EN);
+
+ smm_relocate_and_restore();
/* close the SMM memory window and enable normal SMM */
- pci_config_writeb(i440_bdf, 0x72, 0x02 | 0x08);
+ pci_config_writeb(i440_pci->bdf, I440FX_SMRAM, 0x02 | 0x08);
+}
+
+static const struct pci_device_id smm_init_tbl[] = {
+ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
+ piix4_apmc_smm_init),
+
+ PCI_DEVICE_END,
+};
+
+void
+smm_init(void)
+{
+ if (CONFIG_COREBOOT)
+ // SMM only supported on emulators.
+ return;
+ if (!CONFIG_USE_SMM)
+ return;
+
+ dprintf(3, "init smm\n");
+ pci_find_init_device(smm_init_tbl, NULL);
}