1 // System Management Mode support (on emulators)
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2006 Fabrice Bellard
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
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 #include "dev-i440fx.h"
16 ".global smm_relocation_start\n"
17 ".global smm_relocation_end\n"
18 ".global smm_code_start\n"
19 ".global smm_code_end\n"
22 /* code to relocate SMBASE to 0xa0000 */
23 "smm_relocation_start:\n"
24 " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7efc, %ebx\n"
25 " addr32 mov (%ebx), %al\n" /* revision ID to see if x86_64 or x86 */
28 " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7ef8, %ebx\n"
31 " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7f00, %ebx\n"
33 " movl $" __stringify(BUILD_SMM_ADDR) " - 0x8000, %eax\n"
34 " addr32 movl %eax, (%ebx)\n"
35 /* indicate to the BIOS that the SMM code was executed */
37 " movw $" __stringify(PORT_SMI_STATUS) ", %dx\n"
40 "smm_relocation_end:\n"
42 /* minimal SMM code to enable or disable ACPI */
44 " movw $" __stringify(PORT_SMI_CMD) ", %dx\n"
50 " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */
62 " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */
73 extern u8 smm_relocation_start, smm_relocation_end;
74 extern u8 smm_code_start, smm_code_end;
77 smm_save_and_copy(void)
79 /* save original memory content */
80 memcpy((void *)BUILD_SMM_ADDR, (void *)BUILD_SMM_INIT_ADDR, BUILD_SMM_SIZE);
82 /* copy the SMM relocation code */
83 memcpy((void *)BUILD_SMM_INIT_ADDR, &smm_relocation_start,
84 &smm_relocation_end - &smm_relocation_start);
88 smm_relocate_and_restore(void)
90 /* init APM status port */
91 outb(0x01, PORT_SMI_STATUS);
93 /* raise an SMI interrupt */
94 outb(0x00, PORT_SMI_CMD);
96 /* wait until SMM code executed */
97 while (inb(PORT_SMI_STATUS) != 0x00)
100 /* restore original memory content */
101 memcpy((void *)BUILD_SMM_INIT_ADDR, (void *)BUILD_SMM_ADDR, BUILD_SMM_SIZE);
103 /* copy the SMM code */
104 memcpy((void *)BUILD_SMM_ADDR, &smm_code_start
105 , &smm_code_end - &smm_code_start);
109 static const struct pci_device_id smm_init_tbl[] = {
110 PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
111 piix4_apmc_smm_init),
120 // SMM only supported on emulators.
125 dprintf(3, "init smm\n");
126 pci_find_init_device(smm_init_tbl, NULL);