WebSVN – HelenOS – Blame – /trunk/kernel/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>
195	vana	34	#include <print.h>
33	jermar	35
32	jermar	36	#define RSDP_SIGNATURE "RSD PTR "
		37	#define RSDP_REVISION_OFFS 15
		38
29	jermar	39	struct acpi_rsdp *acpi_rsdp = NULL;
33	jermar	40	struct acpi_rsdt *acpi_rsdt = NULL;
		41	struct acpi_xsdt *acpi_xsdt = NULL;
29	jermar	42
33	jermar	43	struct acpi_signature_map signature_map[] = {
		44	{ "APIC", (struct acpi_sdt_header **) &acpi_madt, "Multiple APIC Description Table" }
		45	};
		46
32	jermar	47	int rsdp_check(__u8 *rsdp) {
		48	struct acpi_rsdp r = (struct acpi_rsdp ) rsdp;
		49	__u8 sum = 0;
		50	int i;
		51
		52	for (i=0; i<20; i++)
		53	sum += rsdp[i];
		54
		55	if (sum)
		56	return 0; /* bad checksum */
		57
		58	if (r->revision == 0)
		59	return 1; /* ACPI 1.0 */
		60
		61	for (; i<r->length; i++)
		62	sum += rsdp[i];
		63
		64	return !sum;
		65
		66	}
		67
33	jermar	68	int acpi_sdt_check(__u8 *sdt)
		69	{
		70	struct acpi_sdt_header h = (struct acpi_sdt_header ) sdt;
		71	__u8 sum = 0;
		72	int i;
		73
		74	for (i=0; i<h->length; i++)
		75	sum += sdt[i];
		76
		77	return !sum;
		78	}
		79
		80	void map_sdt(struct acpi_sdt_header *sdt)
		81	{
		82	map_page_to_frame((__address) sdt, (__address) sdt, PAGE_NOT_CACHEABLE, 0);
116	jermar	83	map_structure((__address) sdt, sdt->length);
33	jermar	84	}
		85
29	jermar	86	void acpi_init(void)
		87	{
125	jermar	88	__u8 addr[2] = { NULL, (__u8 ) 0xe0000 };
		89	int i, j, length[2] = { 1024, 128*1024 };
32	jermar	90	__u64 sig = (__u64 ) RSDP_SIGNATURE;
		91
125	jermar	92	/*
32	jermar	93	* Find Root System Description Pointer
125	jermar	94	* 1. search first 1K of EBDA
		95	* 2. search 128K starting at 0xe0000
		96	*/
32	jermar	97
		98	addr[0] = (__u8 *) ebda;
		99	for (i = (ebda ? 0 : 1); i < 2; i++) {
125	jermar	100	for (j = 0; j < length[i]; j += 16) {
		101	if (((__u64 ) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
		102	acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
		103	goto rsdp_found;
		104	}
		105	}
		106	}
32	jermar	107
125	jermar	108	return;
32	jermar	109
		110	rsdp_found:
125	jermar	111	printf("%L: ACPI Root System Description Pointer\n", acpi_rsdp);
		112
33	jermar	113	acpi_rsdt = (struct acpi_rsdt *) acpi_rsdp->rsdt_address;
		114	if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((__address) acpi_rsdp->xsdt_address);
		115
		116	if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
		117	if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);
		118
		119	if (acpi_rsdt && !acpi_sdt_check((__u8 *) acpi_rsdt)) {
		120	printf("RSDT: %s\n", "bad checksum");
		121	return;
		122	}
		123	if (acpi_xsdt && !acpi_sdt_check((__u8 *) acpi_xsdt)) {
		124	printf("XSDT: %s\n", "bad checksum");
		125	return;
		126	}
		127
		128	if (acpi_xsdt) configure_via_xsdt();
		129	else if (acpi_rsdt) configure_via_rsdt();
		130
29	jermar	131	}
33	jermar	132
		133	void configure_via_rsdt(void)
		134	{
		135	int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u32);
		136
		137	for (i=0; i<cnt; i++) {
		138	for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
		139	struct acpi_sdt_header h = (struct acpi_sdt_header ) acpi_rsdt->entry[i];
		140
125	jermar	141	map_sdt(h);
33	jermar	142	if (((__u32 ) &h->signature[0])==((__u32 ) &signature_map[j].signature[0])) {
		143	if (!acpi_sdt_check((__u8 *) h))
		144	goto next;
		145	*signature_map[j].sdt_ptr = h;
		146	printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
		147	}
		148	}
		149	next:
		150	;
		151	}
		152	}
		153
		154	void configure_via_xsdt(void)
		155	{
		156	int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u64);
		157
		158	for (i=0; i<cnt; i++) {
		159	for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
		160	struct acpi_sdt_header h = (struct acpi_sdt_header ) ((__address) acpi_rsdt->entry[i]);
		161
		162	map_sdt(h);
		163	if (((__u32 ) &h->signature[0])==((__u32 ) &signature_map[j].signature[0])) {
		164	if (!acpi_sdt_check((__u8 *) h))
		165	goto next;
		166	*signature_map[j].sdt_ptr = h;
		167	printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
		168	}
		169	}
		170	next:
		171	;
		172	}
		173
		174	}

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(root)/trunk/kernel/genarch/src/acpi/acpi.c @ 4093 – Rev 195