Following patch implements ACPI resume support for coreboot. The hardware main
hook will come in separate patch perhaps. Signed-off-by: Rudolf Marek <r.marek@assembler.cz> Acked-by: Peter Stuge <peter@stuge.se> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4101 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Rudolf Marek
parent
497c8effce
commit
33cafe5bfb
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@ -14,4 +14,7 @@ end
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if HAVE_ACPI_TABLES
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object acpi.o
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object acpigen.o
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if HAVE_ACPI_RESUME
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object wakeup.S
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end
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end
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@ -27,6 +27,11 @@
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#include <arch/acpigen.h>
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#include <device/pci.h>
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#if HAVE_ACPI_RESUME == 1
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/* this is to be filled by SB code - startup value what was found */
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u8 acpi_slp_type;
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#endif
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u8 acpi_checksum(u8 *table, u32 length)
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{
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u8 ret=0;
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@ -323,12 +328,12 @@ void acpi_create_hpet(acpi_hpet_t *hpet)
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header->checksum = acpi_checksum((void *)hpet, sizeof(acpi_hpet_t));
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}
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void acpi_create_facs(acpi_facs_t *facs)
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{
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memset( (void *)facs,0, sizeof(acpi_facs_t));
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memcpy(facs->signature,"FACS",4);
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memcpy(facs->signature, FACS_NAME, 4);
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facs->length = sizeof(acpi_facs_t);
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facs->hardware_signature = 0;
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facs->firmware_waking_vector = 0;
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@ -365,11 +370,114 @@ void acpi_write_rsdp(acpi_rsdp_t *rsdp, acpi_rsdt_t *rsdt)
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{
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memcpy(rsdp->signature, RSDP_SIG, 8);
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memcpy(rsdp->oem_id, OEM_ID, 6);
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rsdp->length = sizeof(acpi_rsdp_t);
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rsdp->rsdt_address = (u32)rsdt;
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rsdp->revision = 2;
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rsdp->checksum = acpi_checksum((void *)rsdp, 20);
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rsdp->ext_checksum = acpi_checksum((void *)rsdp, sizeof(acpi_rsdp_t));
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}
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#if HAVE_ACPI_RESUME == 1
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int acpi_get_sleep_type(void)
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{
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return acpi_slp_type;
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}
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int acpi_is_wakeup(void)
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{
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return (acpi_slp_type == 3);
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}
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static acpi_rsdp_t *valid_rsdp(acpi_rsdp_t *rsdp)
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{
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if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
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return NULL;
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printk_debug("Looking on %p for valid checksum\n", rsdp);
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if (acpi_checksum((void *)rsdp, 20) != 0)
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return NULL;
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printk_debug("Checksum 1 passed\n");
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if ((rsdp->revision > 1) && (acpi_checksum((void *)rsdp,
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rsdp->length) != 0))
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return NULL;
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printk_debug("Checksum 2 passed all OK\n");
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return rsdp;
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}
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static acpi_rsdp_t *rsdp;
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void *acpi_get_wakeup_rsdp(void)
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{
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return rsdp;
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}
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void *acpi_find_wakeup_vector(void)
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{
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char *p, *end;
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acpi_rsdt_t *rsdt;
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acpi_facs_t *facs;
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acpi_fadt_t *fadt;
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void *wake_vec;
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int i;
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rsdp = NULL;
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if (!acpi_is_wakeup())
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return NULL;
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printk_debug("Trying to find the wakeup vector ...\n");
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/* find RSDP */
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for (p = (char *) 0xe0000; p < (char *) 0xfffff; p+=16) {
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if ((rsdp = valid_rsdp((acpi_rsdp_t *) p)))
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break;
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}
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if (rsdp == NULL)
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return NULL;
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printk_debug("RSDP found at %p\n", rsdp);
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rsdt = (acpi_rsdt_t *) rsdp->rsdt_address;
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end = (char *) rsdt + rsdt->header.length;
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printk_debug("RSDT found at %p ends at %p\n", rsdt, end);
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for (i = 0; ((char *) &rsdt->entry[i]) < end; i++) {
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fadt = (acpi_fadt_t *) rsdt->entry[i];
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if (strncmp((char *)fadt, FADT_NAME, sizeof(FADT_NAME) - 1) == 0)
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break;
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fadt = NULL;
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}
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if (fadt == NULL)
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return NULL;
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printk_debug("FADT found at %p\n", fadt);
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facs = fadt->firmware_ctrl;
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if (facs == NULL)
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return NULL;
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printk_debug("FACS found at %p\n", facs);
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wake_vec = (void *) facs->firmware_waking_vector;
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printk_debug("OS waking vector is %p\n", wake_vec);
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return wake_vec;
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}
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extern char *lowmem_backup;
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extern char *lowmem_backup_ptr;
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extern int lowmem_backup_size;
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void acpi_jump_to_wakeup(void *vector)
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{
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/* just restore the SMP trampoline and continue with wakeup on assembly level */
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memcpy(lowmem_backup_ptr, lowmem_backup, lowmem_backup_size);
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acpi_jmp_to_realm_wakeup((u32) vector);
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}
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#endif
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@ -0,0 +1,89 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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.text
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.code32
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.globl acpi_jmp_to_realm_wakeup
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/* This function does the PM -> RM switch, but
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it can run >1MB even in real mode */
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acpi_jmp_to_realm_wakeup:
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mov 0x4(%esp), %eax
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/* last 4 bits of linear addr are taken as offset */
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andw $0x0f, %ax
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movw %ax, (jmp_off)
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mov 0x4(%esp), %eax
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/* the rest is taken as segment */
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shr $4, %eax
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movw %ax, (jmp_seg)
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lgdt gdtaddr_wakeup
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movl $0x008,%eax
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mov %eax,%ds
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movl %eax,%es
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movl %eax,%ss
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movl %eax,%fs
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movl %eax,%gs
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ljmp $0x0010,$reload_cs
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.code16gcc
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reload_cs:
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/* switch off PE */
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movl %cr0, %eax
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andb $0xfe,%al
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movl %eax, %cr0
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movw $0x0, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw %ax, %fs
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movw %ax, %gs
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/* far jump to OS waking vector. The linear addr is changed to SEG and OFFSET
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check ACPI specs or above code for details */
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.byte 0xea
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jmp_off:
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.word 0
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jmp_seg:
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.word 0
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.code32
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gdt_wakeup_limit = gdt_wakeup_end - gdt_wakeup - 1 /* compute the table limit */
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gdtaddr_wakeup:
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.word gdt_wakeup_limit /* the table limit */
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.long gdt_wakeup /* we know the offset */
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.data
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/* This is the gdt for GCC part of coreboot.
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* It is different from the gdt in ROMCC/ASM part of coreboot
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* which is defined in entry32.inc */
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gdt_wakeup:
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/* selgdt 0, unused */
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.word 0x0000, 0x0000 /* dummy */
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.byte 0x00, 0x00, 0x00, 0x00
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/* selgdt 8, flat data segment 16bit */
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.word 0x0000, 0x0000 /* dummy */
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.byte 0x00, 0x93, 0x8f, 0x00 /* G=1 and 0x0f, So we get 4Gbytes for limit */
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/* selgdt 0x10, flat code segment 16bit */
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.word 0xffff, 0x0000
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.byte 0x00, 0x9b, 0x8f, 0x00 /* G=1 and 0x0f, So we get 4Gbytes for limit */
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gdt_wakeup_end:
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.previous
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.code32
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@ -16,6 +16,9 @@
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#if HAVE_ACPI_TABLES==1
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#include <stdint.h>
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/* 0 = S0, 1 = S1 ...*/
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extern u8 acpi_slp_type;
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#define RSDP_SIG "RSD PTR " /* RSDT Pointer signature */
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#define RSDP_NAME "RSDP"
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@ -27,6 +30,8 @@
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#define SRAT_NAME "SRAT"
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#define SLIT_NAME "SLIT"
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#define SSDT_NAME "SSDT"
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#define FACS_NAME "FACS"
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#define FADT_NAME "FACP"
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#define RSDT_TABLE "RSDT "
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#define HPET_TABLE "AMD64 "
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@ -328,6 +333,10 @@ void acpi_create_facs(acpi_facs_t *facs);
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void acpi_write_rsdt(acpi_rsdt_t *rsdt);
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void acpi_write_rsdp(acpi_rsdp_t *rsdp, acpi_rsdt_t *rsdt);
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void *acpi_find_wakeup_vector(void);
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void *acpi_get_wakeup_rsdp(void);
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extern void acpi_jmp_to_realm_wakeup(u32 linear_addr);
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void acpi_jump_to_wakeup(void *wakeup_addr);
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unsigned long acpi_add_ssdt_pstates(acpi_rsdt_t *rsdt, unsigned long current);
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