os-k/kaleid/kernel/io/acpi.c

92 lines
3.4 KiB
C

//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: ACPI, Hardware detection related functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <init/boot.h>
#include <io/vga.h>
#include <io/acpi.h>
void IoTestAcpi(void)
{
if (BtFirmwareInfo.romValid)
KernLog("\tRom Table is valid at %p\n", BtFirmwareInfo.romTable);
if (BtFirmwareInfo.apmValid)
KernLog("\tApm Table is valid at %p\n", BtFirmwareInfo.apmTable);
RSDPDescriptor *rsdp = IoFindRSDP();
if (!rsdp)
return;
KernLog("\tFound ACPI RSDP (%s) version %d at %p\n",
rsdp->OEMID, (uint)rsdp->revision, rsdp
);
return;
}
RSDPDescriptor *IoFindRSDP()
{
char *rsdp = NULL;
// Search in EBDA
for (rsdp = (char *)0x00080000; // EBDA address
(ulong)rsdp < (ulong)0x0009FFFF; // EBDA end
rsdp++) {
if (rsdp[0] == 'R' &&
rsdp[1] == 'S' &&
rsdp[2] == 'D' &&
rsdp[3] == ' ' &&
rsdp[4] == 'P' &&
rsdp[5] == 'T' &&
rsdp[6] == 'R' &&
rsdp[7] == ' '
) {
return (RSDPDescriptor *)rsdp;
}
}
// Search in BDA
for (rsdp = (char *)0x000E0000; // BDA address
(ulong)rsdp < (ulong)0x000FFFFF; // BDA end
rsdp++) {
if (rsdp[0] == 'R' &&
rsdp[1] == 'S' &&
rsdp[2] == 'D' &&
rsdp[3] == ' ' &&
rsdp[4] == 'P' &&
rsdp[5] == 'T' &&
rsdp[6] == 'R' &&
rsdp[7] == ' '
) {
return (RSDPDescriptor *)rsdp;
}
}
return NULL;
}