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* Copyright (c) 2005 Jakub Jermar
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup genarch
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* @brief Advanced Configuration and Power Interface (ACPI) initialization.
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#include <genarch/acpi/acpi.h>
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#include <genarch/acpi/madt.h>
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#include <arch/bios/bios.h>
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#define RSDP_SIGNATURE "RSD PTR "
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#define RSDP_REVISION_OFFS 15
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struct acpi_rsdp *acpi_rsdp = NULL;
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struct acpi_rsdt *acpi_rsdt = NULL;
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struct acpi_xsdt *acpi_xsdt = NULL;
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struct acpi_signature_map signature_map[] = {
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"Multiple APIC Description Table"
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static int rsdp_check(uint8_t *rsdp) {
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struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
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for (i = 0; i < 20; i++)
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sum = (uint8_t) (sum + rsdp[i]);
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return 0; /* bad checksum */
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return 1; /* ACPI 1.0 */
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for (; i < r->length; i++)
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sum = (uint8_t) (sum + rsdp[i]);
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int acpi_sdt_check(uint8_t *sdt)
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struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
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for (i = 0; i < h->length; i++)
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sum = (uint8_t) (sum + sdt[i]);
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static void map_sdt(struct acpi_sdt_header *sdt)
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page_mapping_insert(AS_KERNEL, (uintptr_t) sdt, (uintptr_t) sdt, PAGE_NOT_CACHEABLE | PAGE_WRITE);
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map_structure((uintptr_t) sdt, sdt->length);
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static void configure_via_rsdt(void)
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unsigned int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint32_t);
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for (i = 0; i < cnt; i++) {
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for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
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struct acpi_sdt_header *h = (struct acpi_sdt_header *) (unative_t) acpi_rsdt->entry[i];
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if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
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if (!acpi_sdt_check((uint8_t *) h))
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*signature_map[j].sdt_ptr = h;
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LOG("%p: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
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static void configure_via_xsdt(void)
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unsigned int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint64_t);
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for (i = 0; i < cnt; i++) {
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for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
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struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((uintptr_t) acpi_rsdt->entry[i]);
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if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
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if (!acpi_sdt_check((uint8_t *) h))
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*signature_map[j].sdt_ptr = h;
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LOG("%p: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
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uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xe0000) };
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int i, j, length[2] = { 1024, 128*1024 };
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uint64_t *sig = (uint64_t *) RSDP_SIGNATURE;
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* Find Root System Description Pointer
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* 1. search first 1K of EBDA
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* 2. search 128K starting at 0xe0000
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addr[0] = (uint8_t *) PA2KA(ebda);
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for (i = (ebda ? 0 : 1); i < 2; i++) {
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for (j = 0; j < length[i]; j += 16) {
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if (*((uint64_t *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
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acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
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LOG("%p: ACPI Root System Description Pointer\n", acpi_rsdp);
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acpi_rsdt = (struct acpi_rsdt *) (unative_t) acpi_rsdp->rsdt_address;
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if (acpi_rsdp->revision)
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acpi_xsdt = (struct acpi_xsdt *) ((uintptr_t) acpi_rsdp->xsdt_address);
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map_sdt((struct acpi_sdt_header *) acpi_rsdt);
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map_sdt((struct acpi_sdt_header *) acpi_xsdt);
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if (acpi_rsdt && !acpi_sdt_check((uint8_t *) acpi_rsdt)) {
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printf("RSDT: bad checksum\n");
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if (acpi_xsdt && !acpi_sdt_check((uint8_t *) acpi_xsdt)) {
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printf("XSDT: bad checksum\n");
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configure_via_xsdt();
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configure_via_rsdt();