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29 jermar 1
/*
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#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>
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32 jermar 35
#define RSDP_SIGNATURE      "RSD PTR "
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#define RSDP_REVISION_OFFS  15
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29 jermar 38
struct acpi_rsdp *acpi_rsdp = NULL;
33 jermar 39
struct acpi_rsdt *acpi_rsdt = NULL;
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struct acpi_xsdt *acpi_xsdt = NULL;
29 jermar 41
 
33 jermar 42
struct acpi_signature_map signature_map[] = {
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    { "APIC", (struct acpi_sdt_header **) &acpi_madt, "Multiple APIC Description Table" }
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};
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32 jermar 46
int rsdp_check(__u8 *rsdp) {
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    struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
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    __u8 sum = 0;
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    int i;
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    for (i=0; i<20; i++)
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        sum += rsdp[i];
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    if (sum)   
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        return 0; /* bad checksum */
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    if (r->revision == 0)
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        return 1; /* ACPI 1.0 */
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    for (; i<r->length; i++)
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        sum += rsdp[i];
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    return !sum;
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}
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33 jermar 67
int acpi_sdt_check(__u8 *sdt)
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{
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    struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
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    __u8 sum = 0;
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    int i;
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    for (i=0; i<h->length; i++)
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        sum += sdt[i];
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    return !sum;
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}
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void map_sdt(struct acpi_sdt_header *sdt)
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{
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    map_page_to_frame((__address) sdt, (__address) sdt, PAGE_NOT_CACHEABLE, 0);
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}
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29 jermar 84
void acpi_init(void)
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{
32 jermar 86
        __u8 *addr[2] = { NULL, (__u8 *) 0xe0000 };
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        int i, j, length[2] = { 1024, 128*1024 };
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    __u64 *sig = (__u64 *) RSDP_SIGNATURE;
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        /*
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     * Find Root System Description Pointer
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         * 1. search first 1K of EBDA
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         * 2. search 128K starting at 0xe0000
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         */
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    addr[0] = (__u8 *) ebda;
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    for (i = (ebda ? 0 : 1); i < 2; i++) {
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                for (j = 0; j < length[i]; j += 16) {
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                        if (*((__u64 *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
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                                acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
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                                goto rsdp_found;
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                        }
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                }
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        }
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        return;
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rsdp_found:
33 jermar 109
        printf("%L: ACPI Root System Description Pointer\n", acpi_rsdp);
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    acpi_rsdt = (struct acpi_rsdt *) acpi_rsdp->rsdt_address;
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    if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((__address) acpi_rsdp->xsdt_address);
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    if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
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    if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);  
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    if (acpi_rsdt && !acpi_sdt_check((__u8 *) acpi_rsdt)) {
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        printf("RSDT: %s\n", "bad checksum");
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        return;
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    }
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    if (acpi_xsdt && !acpi_sdt_check((__u8 *) acpi_xsdt)) {
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        printf("XSDT: %s\n", "bad checksum");
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        return;
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    }
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    if (acpi_xsdt) configure_via_xsdt();
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    else if (acpi_rsdt) configure_via_rsdt();
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29 jermar 129
}
33 jermar 130
 
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void configure_via_rsdt(void)
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{
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    int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u32);
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    for (i=0; i<cnt; i++) {
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        for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
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            struct acpi_sdt_header *h = (struct acpi_sdt_header *) acpi_rsdt->entry[i];
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                map_sdt(h);
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            if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
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                if (!acpi_sdt_check((__u8 *) h))
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                    goto next;
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                *signature_map[j].sdt_ptr = h;
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                printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
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            }
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        }
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next:
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        ;
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    }
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}
151
 
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void configure_via_xsdt(void)
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{
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    int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u64);
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    for (i=0; i<cnt; i++) {
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        for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
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            struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((__address) acpi_rsdt->entry[i]);
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            map_sdt(h);
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            if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
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                if (!acpi_sdt_check((__u8 *) h))
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                    goto next;
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                *signature_map[j].sdt_ptr = h;
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                printf("%L: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
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            }
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        }
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next:
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        ;
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    }
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}