311 lines
8.7 KiB
C
311 lines
8.7 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: ACPI, Hardware detection related functions //
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// //
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// //
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// Copyright © 2018-2020 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <init/boot.h>
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#include <io/vga.h>
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#include <io/acpi.h>
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#include <mm/paging.h>
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#include <mm/map.h>
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char IoACPIVersion = 1;
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int tableCount = 1;
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extern MemoryMap_t memoryMap;
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// ACPI reverse strings
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static char *SDTChar[N_SDT_TYPES] = {
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"APIC",
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"BERT",
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"CPEP",
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"DSDT",
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"ECDT",
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"EINJ",
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"ERST",
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"FACP",
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"FACS",
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"HEST",
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"MSCT",
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"MPST",
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"OEMx",
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"PMTT",
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"PSDT",
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"RASF",
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"RSDT",
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"SBST",
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"SLIT",
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"SRAT",
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"SSDT",
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"XSDT",
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"HPET",
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"MCFG"
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};
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// ACPI Tables Directory
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static SDTHeader_t *SDTDirectory[N_SDT_TYPES] = {0};
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//
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// Returns the checksum of the given structure
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//
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static char DoChecksum(const void *ptr, const size_t size,
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size_t intermediateSize, ulong reason)
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{
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char checksum = 0;
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for (ulong i=0; i < (ulong)size; i++) {
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if (reason && i > (ulong)intermediateSize)
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break;
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checksum += (uchar)((char*)ptr)[i];
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}
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return checksum;
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}
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//
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// Returns the address of the RSDP
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//
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static inline RSDPDescriptor_t *IoFindRSDP()
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{
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char *rsdp = NULL;
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// Search in EBDA
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for (rsdp = (char *)0x00080000; // EBDA address
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(ulong)rsdp < (ulong)0x0009FFFF; // EBDA end
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rsdp++) {
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if (!strncmp(rsdp, "RSD PTR", 6)) {
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return (RSDPDescriptor_t *)rsdp;
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}
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}
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// Search in BDA
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for (rsdp = (char *)0x000E0000; // BDA address
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(ulong)rsdp < (ulong)0x000FFFFF; // BDA end
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rsdp++) {
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if (!strncmp(rsdp, "RSD PTR", 6)) {
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return (RSDPDescriptor_t *)rsdp;
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}
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}
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return NULL;
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}
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//
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// RSDP Exploration
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//
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static inline void IoInitRSDP(void)
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{
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char checksum = 1;
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RSDPDescriptor_t *rsdp = IoFindRSDP();
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if (!rsdp)
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KeStartPanic("ACPI RSDP not found in memory");
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// Checksum calculation
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checksum = DoChecksum(rsdp, (size_t)sizeof(RSDPDescriptor_t),
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(size_t)sizeof(struct RSDPLegacy),
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!rsdp->legacy.revision
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);
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if (checksum)
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KeStartPanic("Invalid RSDP checksum : %d vs 0", checksum);
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if (rsdp->legacy.revision == 1 || rsdp->legacy.revision >= 3)
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KeStartPanic("Invalid ACPI Revision : %d", rsdp->legacy.revision);
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DebugLog("ACPI Revision %d (OEM %s)\n",
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(uint)rsdp->legacy.revision,
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rsdp->legacy.OEMID
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);
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SDTDirectory[SDT_RSDT] = (void *)(ulong)rsdp->legacy.rsdtAddress;
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if (rsdp->legacy.revision) {
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SDTDirectory[SDT_XSDT] = (void *)rsdp->xsdtAddress;
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IoACPIVersion = 2;
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}
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}
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//
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// R/XSDT Exploration
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//
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static inline void IoInitRXSDT(void)
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{
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char checksum = 1;
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SDTHeader_t *rxsdt = SDTDirectory[SDT_RSDT];
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if (IoACPIVersion == 2) {
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rxsdt = SDTDirectory[SDT_XSDT];
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}
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/* // Checksum calculation */
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checksum = DoChecksum(rxsdt, (size_t)rxsdt->length,
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0,
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0
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);
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if (checksum)
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KeStartPanic("Invalid RSDT checksum : %d vs 0", checksum);
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if (IoACPIVersion == 1) {
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DebugLog("ACPI Root System Table %s (%s) length %d [%p]\n",
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rxsdt->signature,
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rxsdt->OEMID,
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rxsdt->length,
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rxsdt
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);
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} else {
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DebugLog("ACPI Extended System Table %s (%s) length %d [%p]\n",
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rxsdt->signature,
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rxsdt->OEMID,
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rxsdt->length,
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rxsdt
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);
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}
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}
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//
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// Explore all ACPI Tables
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//
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static inline void IoSearchAcpiTables(void)
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{
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SDTHeader_t *xrsdt = SDTDirectory[SDT_RSDT];
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SDTHeader_t *table = NULL;
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uint *curInt = NULL;
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ulong *curLong = NULL;
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register char checksum;
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int entries;
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if (IoACPIVersion == 1) {
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entries = (xrsdt->length - sizeof(xrsdt)) / 4;
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} else {
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xrsdt = SDTDirectory[SDT_XSDT];
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entries = (xrsdt->length - sizeof(xrsdt)) / 8;
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}
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DebugLog("ACPI detected %d entries\n", entries);
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curInt = (uint*)&(xrsdt->sdtEntry);
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curLong = (ulong*)&(xrsdt->sdtEntry);
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// Parsing R/XSDT
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for (int i = 0; i < entries; i++) {
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if (IoACPIVersion == 1)
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table = (SDTHeader_t *)(ulong)curInt[i];
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else
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table = (SDTHeader_t *)(ulong)curLong[i];
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if (MmIsBusyZone(table)) {
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checksum = DoChecksum(table, (size_t)table->length, 0, 0);
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if (!checksum) {
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for (ulong i=0; i < N_SDT_TYPES; i++) {
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if (!strncmp(table->signature, SDTChar[i], 3)) {
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DebugLog("ACPI System Table %s (OEM %s) length %d [%p]\n",
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SDTChar[i],
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table->OEMID,
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table->length,
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table
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);
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SDTDirectory[i] = table;
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}
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}
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}
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}
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}
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// Parsing FADT
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FADT_t *fadt = (FADT_t *)IoGetAcpiTable(SDT_FADT);
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SDTHeader_t *dsdt;
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if (IoACPIVersion == 1) {
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dsdt = (SDTHeader_t *)(ulong)fadt->dsdtAddress;
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} else {
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dsdt = (SDTHeader_t *)(ulong)fadt->xDsdtAddress;
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}
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checksum = DoChecksum(dsdt, (size_t)dsdt->length, 0, 0);
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if (!checksum) {
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if (!strncmp(dsdt->signature, SDTChar[SDT_DSDT], 3)) {
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DebugLog("ACPI System Table %s (OEM %s) length %d [%p]\n",
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SDTChar[SDT_DSDT],
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dsdt->OEMID,
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dsdt->length,
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dsdt
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);
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SDTDirectory[SDT_DSDT] = dsdt;
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}
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}
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}
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// -------------------------------------------------------------------------- //
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//
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// Initialise the ACPI by finding tables
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//
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void IoInitAcpi(void)
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{
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// MAP ACPI PAGES
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for (uint i = 0; i < memoryMap.length; i++) {
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if (memoryMap.entry[i].type != AVAILABLE_ZONE) {
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// Map each page that is in the busy zone
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for (uint j = 0;
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j < (memoryMap.entry[i].length
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+ ((ulong)memoryMap.entry[i].addr)
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- ((ulong)memoryMap.entry[i].addr
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& 0xFFFFFFFFFFFFF000))
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/ KPAGESIZE;
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j++) {
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MmMapPage(memoryMap.entry[i].addr + KPAGESIZE*j,
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memoryMap.entry[i].addr + KPAGESIZE*j,
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PRESENT);
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//KernLog("ACPI %d ID MAP %p\n", i,
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// memoryMap.entry[i].addr + KPAGESIZE*j);
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}
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}
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}
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// FIND RSDP
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IoInitRSDP();
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IoInitRXSDT();
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IoSearchAcpiTables();
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}
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// -------------------------------------------------------------------------- //
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//
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// Returns the addr of the submitted SDT
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//
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// Arg must be a member of the enum in acpi.h
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//
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SDTHeader_t *IoGetAcpiTable(ulong id)
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{
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return SDTDirectory[id];
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}
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