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/*
* LinuxBIOS ACPI Table support
* written by Stefan Reinauer <stepan@openbios.org>
* (C) 2004 SUSE LINUX AG
*/
#include <console/console.h>
#include <string.h>
#include <arch/acpi.h>
#define RSDP_SIG "RSD PTR " /* RSDT Pointer signature */
#define RSDP_NAME "RSDP"
#define RSDT_NAME "RSDT"
#define HPET_NAME "HPET"
#define RSDT_TABLE " RSDT "
#define HPET_TABLE "AMD64 "
#define OEM_ID "LXBIOS"
#define ASLC "NONE"
static u8 acpi_checksum(u8 *table, u32 length)
{
u8 ret=0;
while (length--) {
ret += *table;
table++;
}
return ret;
}
static void acpi_add_table(acpi_rsdt_t *rsdt, void *table)
{
int i;
for (i=0; i<8; i++) {
if(rsdt->entry[i]==0) {
rsdt->entry[i]=(u32)table;
/* fix checksum */
/* hope this won't get optimized away */
rsdt->header.checksum=0;
rsdt->header.checksum=acpi_checksum((u8 *)rsdt,
rsdt->header.length);
printk_debug("ACPI: added table %d/8\n",i);
return;
}
}
printk_warning("ACPI: could not ACPI table. failed.\n");
}
static void acpi_create_hpet(acpi_hpet_t *hpet)
{
#define HPET_ADDR 0xfed00000ULL
acpi_header_t *header=&(hpet->header);
acpi_addr_t *addr=&(hpet->addr);
/* fill out header fields */
memcpy(header->signature, HPET_NAME, 4);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, HPET_TABLE, 8);
memcpy(header->asl_compiler_id, ASLC, 4);
header->length = sizeof(acpi_hpet_t);
header->revision = 1;
/* fill out HPET address */
addr->space_id = 0; /* Memory */
addr->bit_width = 64;
addr->bit_offset = 0;
addr->addrl = HPET_ADDR & 0xffffffff;
addr->addrh = HPET_ADDR >> 32;
hpet->id = 0x102282a0; /* AMD ? */
hpet->number = 0;
hpet->min_tick = 4096;
}
static void acpi_write_rsdt(acpi_rsdt_t *rsdt)
{
acpi_header_t *header=&(rsdt->header);
/* fill out header fields */
memcpy(header->signature, RSDT_NAME, 4);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, RSDT_TABLE, 8);
memcpy(header->asl_compiler_id, ASLC, 4);
header->length = sizeof(acpi_rsdt_t);
header->revision = 1;
/* fill out entries */
// entries are filled in later, we come with an empty set.
/* fix checksum */
header->checksum = acpi_checksum((void *)rsdt, sizeof(acpi_rsdt_t));
}
static void acpi_write_rsdp(acpi_rsdp_t *rsdp, acpi_rsdt_t *rsdt)
{
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
rsdp->length = sizeof(acpi_rsdp_t);
rsdp->rsdt_address = (u32)rsdt;
rsdp->checksum = acpi_checksum((void *)rsdp, sizeof(acpi_rsdp_t));
}
unsigned long write_acpi_tables(unsigned long start)
{
unsigned long current = start;
acpi_rsdp_t *rsdp;
acpi_rsdt_t *rsdt;
acpi_hpet_t *hpet;
printk_info("ACPI: Writing ACPI tables at %lx...\n", start);
/* We need at least an RSDP and an RSDT Table */
rsdp = (acpi_rsdp_t *) current;
current += sizeof(acpi_rsdp_t);
rsdt = (acpi_rsdt_t *) current;
current += sizeof(acpi_rsdt_t);
/* clear all table memory */
memset((void *)start, 0, current - start);
acpi_write_rsdp(rsdp, rsdt);
acpi_write_rsdt(rsdt);
/*
* We explicitly add these tables later on:
*/
#define HAVE_ACPI_HPET
#ifdef HAVE_ACPI_HPET
printk_debug("ACPI: * HPET\n");
hpet = (acpi_hpet_t *) current;
current += sizeof(acpi_hpet_t);
acpi_create_hpet(hpet);
acpi_add_table(rsdt,hpet);
#endif
printk_info("ACPI: done.\n");
return current;
}
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