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