please forgive me... ;)

 * initial acpi support code
 * fix header


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1358 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 151 insertions, 0 deletions

diff --git a/src/arch/i386/boot/acpi.c b/src/arch/i386/boot/acpi.c
new file mode 100644
index 0000000000..6afcd9c276
--- /dev/null
+++ b/src/arch/i386/boot/acpi.c
@@ -0,0 +1,151 @@
+/*
+ * 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;
+}
+