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1.1 root 1: // System Management Mode support (on emulators)
2: //
3: // Copyright (C) 2008 Kevin O'Connor <[email protected]>
4: // Copyright (C) 2006 Fabrice Bellard
5: //
6: // This file may be distributed under the terms of the GNU LGPLv3 license.
7:
8: #include "pci.h" // pci_config_writel
9: #include "util.h" // wbinvd
10: #include "config.h" // CONFIG_*
11: #include "ioport.h" // outb
12: #include "pci_ids.h" // PCI_VENDOR_ID_INTEL
13:
1.1.1.2 root 14: ASM32FLAT(
1.1 root 15: ".global smm_relocation_start\n"
16: ".global smm_relocation_end\n"
17: ".global smm_code_start\n"
18: ".global smm_code_end\n"
19: " .code16\n"
20:
21: /* code to relocate SMBASE to 0xa0000 */
22: "smm_relocation_start:\n"
23: " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7efc, %ebx\n"
24: " addr32 mov (%ebx), %al\n" /* revision ID to see if x86_64 or x86 */
25: " cmp $0x64, %al\n"
26: " je 1f\n"
27: " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7ef8, %ebx\n"
28: " jmp 2f\n"
29: "1:\n"
30: " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7f00, %ebx\n"
31: "2:\n"
32: " movl $" __stringify(BUILD_SMM_ADDR) " - 0x8000, %eax\n"
33: " addr32 movl %eax, (%ebx)\n"
34: /* indicate to the BIOS that the SMM code was executed */
35: " mov $0x00, %al\n"
36: " movw $" __stringify(PORT_SMI_STATUS) ", %dx\n"
37: " outb %al, %dx\n"
38: " rsm\n"
39: "smm_relocation_end:\n"
40:
41: /* minimal SMM code to enable or disable ACPI */
42: "smm_code_start:\n"
43: " movw $" __stringify(PORT_SMI_CMD) ", %dx\n"
44: " inb %dx, %al\n"
45: " cmp $0xf0, %al\n"
46: " jne 1f\n"
47:
48: /* ACPI disable */
49: " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */
50: " inw %dx, %ax\n"
51: " andw $~1, %ax\n"
52: " outw %ax, %dx\n"
53:
54: " jmp 2f\n"
55:
56: "1:\n"
57: " cmp $0xf1, %al\n"
58: " jne 2f\n"
59:
60: /* ACPI enable */
61: " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */
62: " inw %dx, %ax\n"
63: " orw $1, %ax\n"
64: " outw %ax, %dx\n"
65:
66: "2:\n"
67: " rsm\n"
68: "smm_code_end:\n"
69: " .code32\n"
70: );
71:
72: extern u8 smm_relocation_start, smm_relocation_end;
73: extern u8 smm_code_start, smm_code_end;
74:
1.1.1.4 ! root 75: static void
1.1.1.3 root 76: smm_save_and_copy(void)
1.1 root 77: {
78: /* save original memory content */
79: memcpy((void *)BUILD_SMM_ADDR, (void *)BUILD_SMM_INIT_ADDR, BUILD_SMM_SIZE);
80:
81: /* copy the SMM relocation code */
82: memcpy((void *)BUILD_SMM_INIT_ADDR, &smm_relocation_start,
83: &smm_relocation_end - &smm_relocation_start);
1.1.1.3 root 84: }
1.1 root 85:
1.1.1.4 ! root 86: static void
1.1.1.3 root 87: smm_relocate_and_restore(void)
88: {
1.1 root 89: /* init APM status port */
90: outb(0x01, PORT_SMI_STATUS);
91:
92: /* raise an SMI interrupt */
93: outb(0x00, PORT_SMI_CMD);
94:
95: /* wait until SMM code executed */
96: while (inb(PORT_SMI_STATUS) != 0x00)
97: ;
98:
99: /* restore original memory content */
100: memcpy((void *)BUILD_SMM_INIT_ADDR, (void *)BUILD_SMM_ADDR, BUILD_SMM_SIZE);
101:
102: /* copy the SMM code */
103: memcpy((void *)BUILD_SMM_ADDR, &smm_code_start
104: , &smm_code_end - &smm_code_start);
105: wbinvd();
1.1.1.3 root 106: }
107:
1.1.1.4 ! root 108: #define I440FX_SMRAM 0x72
! 109: #define PIIX_DEVACTB 0x58
! 110: #define PIIX_APMC_EN (1 << 25)
! 111:
! 112: // This code is hardcoded for PIIX4 Power Management device.
! 113: static void piix4_apmc_smm_init(struct pci_device *pci, void *arg)
! 114: {
! 115: struct pci_device *i440_pci = pci_find_device(PCI_VENDOR_ID_INTEL
! 116: , PCI_DEVICE_ID_INTEL_82441);
! 117: if (!i440_pci)
! 118: return;
! 119:
! 120: /* check if SMM init is already done */
! 121: u32 value = pci_config_readl(pci->bdf, PIIX_DEVACTB);
! 122: if (value & PIIX_APMC_EN)
! 123: return;
! 124:
! 125: /* enable the SMM memory window */
! 126: pci_config_writeb(i440_pci->bdf, I440FX_SMRAM, 0x02 | 0x48);
! 127:
! 128: smm_save_and_copy();
! 129:
! 130: /* enable SMI generation when writing to the APMC register */
! 131: pci_config_writel(pci->bdf, PIIX_DEVACTB, value | PIIX_APMC_EN);
! 132:
! 133: smm_relocate_and_restore();
! 134:
! 135: /* close the SMM memory window and enable normal SMM */
! 136: pci_config_writeb(i440_pci->bdf, I440FX_SMRAM, 0x02 | 0x08);
! 137: }
! 138:
1.1.1.3 root 139: static const struct pci_device_id smm_init_tbl[] = {
140: PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
141: piix4_apmc_smm_init),
142:
143: PCI_DEVICE_END,
144: };
145:
146: void
147: smm_init(void)
148: {
149: if (CONFIG_COREBOOT)
150: // SMM only supported on emulators.
151: return;
152: if (!CONFIG_USE_SMM)
153: return;
1.1 root 154:
1.1.1.3 root 155: dprintf(3, "init smm\n");
156: pci_find_init_device(smm_init_tbl, NULL);
1.1 root 157: }
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