| // System Management Mode support (on emulators) |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // Copyright (C) 2006 Fabrice Bellard |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "pci.h" // pci_config_writel |
| #include "util.h" // wbinvd |
| #include "config.h" // CONFIG_* |
| #include "ioport.h" // outb |
| #include "pci_ids.h" // PCI_VENDOR_ID_INTEL |
| #include "dev-i440fx.h" |
| |
| ASM32FLAT( |
| ".global smm_relocation_start\n" |
| ".global smm_relocation_end\n" |
| ".global smm_code_start\n" |
| ".global smm_code_end\n" |
| " .code16\n" |
| |
| /* code to relocate SMBASE to 0xa0000 */ |
| "smm_relocation_start:\n" |
| " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7efc, %ebx\n" |
| " addr32 mov (%ebx), %al\n" /* revision ID to see if x86_64 or x86 */ |
| " cmp $0x64, %al\n" |
| " je 1f\n" |
| " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7ef8, %ebx\n" |
| " jmp 2f\n" |
| "1:\n" |
| " mov $" __stringify(BUILD_SMM_INIT_ADDR) " + 0x7f00, %ebx\n" |
| "2:\n" |
| " movl $" __stringify(BUILD_SMM_ADDR) " - 0x8000, %eax\n" |
| " addr32 movl %eax, (%ebx)\n" |
| /* indicate to the BIOS that the SMM code was executed */ |
| " mov $0x00, %al\n" |
| " movw $" __stringify(PORT_SMI_STATUS) ", %dx\n" |
| " outb %al, %dx\n" |
| " rsm\n" |
| "smm_relocation_end:\n" |
| |
| /* minimal SMM code to enable or disable ACPI */ |
| "smm_code_start:\n" |
| " movw $" __stringify(PORT_SMI_CMD) ", %dx\n" |
| " inb %dx, %al\n" |
| " cmp $0xf0, %al\n" |
| " jne 1f\n" |
| |
| /* ACPI disable */ |
| " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */ |
| " inw %dx, %ax\n" |
| " andw $~1, %ax\n" |
| " outw %ax, %dx\n" |
| |
| " jmp 2f\n" |
| |
| "1:\n" |
| " cmp $0xf1, %al\n" |
| " jne 2f\n" |
| |
| /* ACPI enable */ |
| " mov $" __stringify(PORT_ACPI_PM_BASE) " + 0x04, %dx\n" /* PMCNTRL */ |
| " inw %dx, %ax\n" |
| " orw $1, %ax\n" |
| " outw %ax, %dx\n" |
| |
| "2:\n" |
| " rsm\n" |
| "smm_code_end:\n" |
| " .code32\n" |
| ); |
| |
| extern u8 smm_relocation_start, smm_relocation_end; |
| extern u8 smm_code_start, smm_code_end; |
| |
| void |
| smm_save_and_copy(void) |
| { |
| /* 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); |
| } |
| |
| void |
| smm_relocate_and_restore(void) |
| { |
| /* init APM status port */ |
| outb(0x01, PORT_SMI_STATUS); |
| |
| /* raise an SMI interrupt */ |
| outb(0x00, PORT_SMI_CMD); |
| |
| /* wait until SMM code executed */ |
| while (inb(PORT_SMI_STATUS) != 0x00) |
| ; |
| |
| /* restore original memory content */ |
| memcpy((void *)BUILD_SMM_INIT_ADDR, (void *)BUILD_SMM_ADDR, BUILD_SMM_SIZE); |
| |
| /* copy the SMM code */ |
| memcpy((void *)BUILD_SMM_ADDR, &smm_code_start |
| , &smm_code_end - &smm_code_start); |
| wbinvd(); |
| } |
| |
| 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); |
| } |