WebSVN – HelenOS-historic – Blame – /kernel/trunk/genarch/src/acpi/acpi.c

Rev	Author	Line No.	Line
29	jermar	1	/*
		2	* Copyright (C) 2005 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	#include <arch/acpi/acpi.h>
33	jermar	30	#include <arch/acpi/madt.h>
32	jermar	31	#include <arch/bios/bios.h>
29	jermar	32
33	jermar	33	#include <mm/page.h>
		34
32	jermar	35	#define RSDP_SIGNATURE "RSD PTR "
		36	#define RSDP_REVISION_OFFS 15
		37
29	jermar	38	struct acpi_rsdp *acpi_rsdp = NULL;
33	jermar	39	struct acpi_rsdt *acpi_rsdt = NULL;
		40	struct acpi_xsdt *acpi_xsdt = NULL;
29	jermar	41
33	jermar	42	struct acpi_signature_map signature_map[] = {
		43	{ "APIC", (struct acpi_sdt_header **) &acpi_madt, "Multiple APIC Description Table" }
		44	};
		45
32	jermar	46	int rsdp_check(__u8 *rsdp) {
		47	struct acpi_rsdp r = (struct acpi_rsdp ) rsdp;
		48	__u8 sum = 0;
		49	int i;
		50
		51	for (i=0; i<20; i++)
		52	sum += rsdp[i];
		53
		54	if (sum)
		55	return 0; /* bad checksum */
		56
		57	if (r->revision == 0)
		58	return 1; /* ACPI 1.0 */
		59
		60	for (; i<r->length; i++)
		61	sum += rsdp[i];
		62
		63	return !sum;
		64
		65	}
		66
33	jermar	67	int acpi_sdt_check(__u8 *sdt)
		68	{
		69	struct acpi_sdt_header h = (struct acpi_sdt_header ) sdt;
		70	__u8 sum = 0;
		71	int i;
		72
		73	for (i=0; i<h->length; i++)
		74	sum += sdt[i];
		75
		76	return !sum;
		77	}
		78
		79	void map_sdt(struct acpi_sdt_header *sdt)
		80	{
		81	map_page_to_frame((__address) sdt, (__address) sdt, PAGE_NOT_CACHEABLE, 0);
		82	}
		83
29	jermar	84	void acpi_init(void)
		85	{
32	jermar	86	__u8 addr[2] = { NULL, (__u8 ) 0xe0000 };
		87	int i, j, length[2] = { 1024, 128*1024 };
		88	__u64 sig = (__u64 ) RSDP_SIGNATURE;
		89
		90	/*
		91	* Find Root System Description Pointer
		92	* 1. search first 1K of EBDA
		93	* 2. search 128K starting at 0xe0000
		94	*/
		95
		96	addr[0] = (__u8 *) ebda;
		97	for (i = (ebda ? 0 : 1); i < 2; i++) {
		98	for (j = 0; j < length[i]; j += 16) {
		99	if (((__u64 ) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
		100	acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
		101	goto rsdp_found;
		102	}
		103	}
		104	}
		105
		106	return;
		107
		108	rsdp_found:
33	jermar	109	printf("%L: ACPI Root System Description Pointer\n", acpi_rsdp);
		110
		111	acpi_rsdt = (struct acpi_rsdt *) acpi_rsdp->rsdt_address;
		112	if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((__address) acpi_rsdp->xsdt_address);
		113
		114	if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
		115	if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);
		116
		117	if (acpi_rsdt && !acpi_sdt_check((__u8 *) acpi_rsdt)) {
		118	printf("RSDT: %s\n", "bad checksum");
		119	return;
		120	}
		121	if (acpi_xsdt && !acpi_sdt_check((__u8 *) acpi_xsdt)) {
		122	printf("XSDT: %s\n", "bad checksum");
		123	return;
		124	}
		125
		126	if (acpi_xsdt) configure_via_xsdt();
		127	else if (acpi_rsdt) configure_via_rsdt();
		128
29	jermar	129	}
33	jermar	130
		131	void configure_via_rsdt(void)
		132	{
		133	int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u32);
		134
		135	for (i=0; i<cnt; i++) {
		136	for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
		137	struct acpi_sdt_header h = (struct acpi_sdt_header ) acpi_rsdt->entry[i];
		138
		139	map_sdt(h);
		140	if (((__u32 ) &h->signature[0])==((__u32 ) &signature_map[j].signature[0])) {
		141	if (!acpi_sdt_check((__u8 *) h))
		142	goto next;
		143	*signature_map[j].sdt_ptr = h;
		144	printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
		145	}
		146	}
		147	next:
		148	;
		149	}
		150	}
		151
		152	void configure_via_xsdt(void)
		153	{
		154	int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u64);
		155
		156	for (i=0; i<cnt; i++) {
		157	for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
		158	struct acpi_sdt_header h = (struct acpi_sdt_header ) ((__address) acpi_rsdt->entry[i]);
		159
		160	map_sdt(h);
		161	if (((__u32 ) &h->signature[0])==((__u32 ) &signature_map[j].signature[0])) {
		162	if (!acpi_sdt_check((__u8 *) h))
		163	goto next;
		164	*signature_map[j].sdt_ptr = h;
		165	printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
		166	}
		167	}
		168	next:
		169	;
		170	}
		171
		172	}

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(root)/kernel/trunk/genarch/src/acpi/acpi.c @ 1780 – Rev 33