351 lines
8.2 KiB
C
351 lines
8.2 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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All rights reserved
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Module Name:
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acpisetd.c
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Abstract:
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This module detects an ACPI system. It
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is included into setup so that setup
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can figure out which HAL to load
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Author:
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Jake Oshins (jakeo) - Feb. 7, 1997.
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Environment:
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Textmode setup.
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Revision History:
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--*/
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#include "bootx86.h"
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#include "stdlib.h"
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#include "string.h"
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VOID
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BlPrint(
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PCHAR cp,
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...
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);
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#ifdef DEBUG
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#undef DEBUG_PRINT
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#define DEBUG_PRINT BlPrint
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#else
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#define DEBUG_PRINT
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#endif
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typedef struct _ACPI_BIOS_INSTALLATION_CHECK {
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UCHAR Signature[8]; // "RSD PTR" (ascii)
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UCHAR Checksum;
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UCHAR OemId[6]; // An OEM-supplied string
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UCHAR reserved; // must be 0
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ULONG RsdtAddress; // 32-bit physical address of RSDT
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} ACPI_BIOS_INSTALLATION_CHECK, *PACPI_BIOS_INSTALLATION_CHECK;
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#include "acpitabl.h"
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PRSDP BlRsdp;
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PRSDT BlRsdt;
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PXSDT BlXsdt;
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BOOLEAN BlLegacyFree = FALSE;
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PDESCRIPTION_HEADER
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BlFindACPITable(
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IN PCHAR TableName,
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IN ULONG TableLength
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);
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// from boot\detect\i386\acpibios.h
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//
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// Acpi BIOS Installation check
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//
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#define ACPI_BIOS_START 0xE0000
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#define ACPI_BIOS_END 0xFFFFF
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#define ACPI_BIOS_HEADER_INCREMENT 16
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VOID
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BlFindRsdp (
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VOID
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)
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#define EBDA_SEGMENT_PTR 0x40e
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{
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ULONG romAddr, romEnd;
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PACPI_BIOS_INSTALLATION_CHECK header;
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UCHAR sum, node = 0;
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USHORT i, nodeSize;
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ULONG EbdaSegmentPtr;
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ULONG EbdaPhysicalAdd = 0;
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PUCHAR EbdaVirtualAdd = 0;
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PHYSICAL_ADDRESS paddr;
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enum PASS { PASS1 = 0, PASS2, MAX_PASSES } pass;
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USHORT count = 0;
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//
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// Search on 16 byte boundaries for the signature of the
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// Root System Description Table structure.
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//
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for (pass = PASS1; pass < MAX_PASSES; pass++) {
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if (pass == PASS1) {
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//
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// On the first pass, we search the first 1K of the
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// Extended BIOS data area. The EBDA segment address
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// is available at physical address 40:0E.
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//
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paddr.QuadPart = 0;
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EbdaSegmentPtr = (ULONG) MmMapIoSpace( paddr,
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PAGE_SIZE,
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TRUE);
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EbdaSegmentPtr += EBDA_SEGMENT_PTR;
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EbdaPhysicalAdd = *((PUSHORT)EbdaSegmentPtr);
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EbdaPhysicalAdd = EbdaPhysicalAdd << 4;
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if (EbdaPhysicalAdd) {
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paddr.HighPart = 0;
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paddr.LowPart = EbdaPhysicalAdd;
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EbdaVirtualAdd = MmMapIoSpace( paddr,
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2 * PAGE_SIZE,
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TRUE);
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}
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if (!EbdaVirtualAdd) {
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continue;
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}
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romAddr = (ULONG)EbdaVirtualAdd;
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romEnd = romAddr + 1024;
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} else {
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//
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// On the second pass, we search (physical) memory 0xE0000
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// to 0xF0000.
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paddr.LowPart = ACPI_BIOS_START;
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romAddr = (ULONG)MmMapIoSpace(paddr,
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ACPI_BIOS_END - ACPI_BIOS_START,
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TRUE);
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romEnd = romAddr + (ACPI_BIOS_END - ACPI_BIOS_START);
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}
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while (romAddr < romEnd) {
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header = (PACPI_BIOS_INSTALLATION_CHECK)romAddr;
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//
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// Signature to match is the string "RSD PTR ".
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//
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if (header->Signature[0] == 'R' && header->Signature[1] == 'S' &&
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header->Signature[2] == 'D' && header->Signature[3] == ' ' &&
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header->Signature[4] == 'P' && header->Signature[5] == 'T' &&
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header->Signature[6] == 'R' && header->Signature[7] == ' ' ) {
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sum = 0;
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for (i = 0; i < sizeof(ACPI_BIOS_INSTALLATION_CHECK); i++) {
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sum += ((PUCHAR)romAddr)[i];
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}
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if (sum == 0) {
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pass = MAX_PASSES; // leave 'for' loop
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break; // leave 'while' loop
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}
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}
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romAddr += ACPI_BIOS_HEADER_INCREMENT;
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}
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}
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if (romAddr >= romEnd) {
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BlRsdp = NULL;
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BlRsdt = NULL;
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return;
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}
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BlRsdp = (PRSDP)romAddr;
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paddr.LowPart = BlRsdp->RsdtAddress;
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BlRsdt = MmMapIoSpace(paddr, sizeof(RSDT), TRUE);
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BlRsdt = MmMapIoSpace(paddr, BlRsdt->Header.Length, TRUE);
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#ifdef ACPI_20_COMPLIANT
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if (BlRsdp->Revision > 1) {
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//
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// ACPI 2.0 BIOS
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//
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BlXsdt = MmMapIoSpace(paddr, sizeof(XSDT), TRUE);
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BlXsdt = MmMapIoSpace(paddr, BlXsdt->Header.Length, TRUE);
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}
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#endif
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return;
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}
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BOOLEAN
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BlDetectLegacyFreeBios(
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VOID
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)
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{
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PFADT fadt;
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if (BlLegacyFree) {
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return TRUE;
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}
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BlFindRsdp();
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if (BlRsdt) {
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fadt = (PFADT)BlFindACPITable("FACP", sizeof(FADT));
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if (fadt == NULL) {
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return FALSE;
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}
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if ((fadt->Header.Revision < 2) ||
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(fadt->Header.Length <= 116)) {
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//
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// The BIOS is earlier than the legacy-free
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// additions.
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//
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return FALSE;
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}
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if (!(fadt->boot_arch & I8042)) {
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BlLegacyFree = TRUE;
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return TRUE;
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}
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}
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return FALSE;
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}
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PDESCRIPTION_HEADER
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BlFindACPITable(
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IN PCHAR TableName,
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IN ULONG TableLength
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)
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/*++
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Routine Description:
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Given a table name, finds that table in the ACPI BIOS
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Arguments:
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TableName - Supplies the table name
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TableLength - Supplies the length of the table to map
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Return Value:
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Pointer to the table if found
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NULL if the table is not found
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--*/
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{
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ULONG Signature;
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PFADT Fadt;
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PDESCRIPTION_HEADER Header;
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ULONG TableCount;
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ULONG i;
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PHYSICAL_ADDRESS paddr = {0};
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Signature = *((ULONG UNALIGNED *)TableName);
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if (Signature == RSDT_SIGNATURE) {
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return(&BlRsdt->Header);
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} else if (Signature == XSDT_SIGNATURE) {
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return(&BlXsdt->Header);
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} else if (Signature == DSDT_SIGNATURE) {
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Fadt = (PFADT)BlFindACPITable("FACP", sizeof(PFADT));
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if (Fadt == NULL) {
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return(NULL);
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}
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if (BlXsdt) {
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paddr = Fadt->x_dsdt;
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} else {
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#if defined(_X86_)
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paddr.LowPart = Fadt->dsdt;
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#else
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paddr.QuadPart = Fadt->dsdt;
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#endif
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}
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Header = MmMapIoSpace(paddr, TableLength, TRUE);
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return(Header);
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} else {
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//
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// Make sure...
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//
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if( !BlRsdt ) {
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BlFindRsdp();
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}
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if( BlRsdt ) {
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TableCount = BlXsdt ?
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NumTableEntriesFromXSDTPointer(BlXsdt) :
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NumTableEntriesFromRSDTPointer(BlRsdt);
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//
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// Sanity check.
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//
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if( TableCount > 0x100 ) {
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return(NULL);
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}
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for (i=0;i<TableCount;i++) {
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if (BlXsdt) {
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paddr = BlXsdt->Tables[i];
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} else {
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#if defined(_X86_)
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paddr.HighPart = 0;
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paddr.LowPart = BlRsdt->Tables[i];
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#else
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paddr.QuadPart = BlRsdt->Tables[i];
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#endif
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}
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Header = MmMapIoSpace(paddr, sizeof(DESCRIPTION_HEADER), TRUE);
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if (Header == NULL) {
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return(NULL);
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}
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if (Header->Signature == Signature) {
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//
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// if we need to map more than just the DESCRIPTION_HEADER, do that before
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// returning. Check to see if the end of the table lies past the page
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// boundary the header lies on. If so, we will have to map it.
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//
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if ( ((paddr.LowPart + TableLength) & ~(PAGE_SIZE - 1)) >
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((paddr.LowPart + sizeof(DESCRIPTION_HEADER)) & ~(PAGE_SIZE - 1)) ) {
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Header = MmMapIoSpace(paddr, TableLength, TRUE);
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}
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return(Header);
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}
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}
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}
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}
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return(NULL);
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}
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