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2811d2f990
Memory map array should be large enough to fit additional descriptors. CORE-16216 CORE-16267
142 lines
4 KiB
C
142 lines
4 KiB
C
/*
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* FreeLoader
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Note: much of this code was based on knowledge and/or code developed
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* by the Xbox Linux group: http://www.xbox-linux.org
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*/
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#include <freeldr.h>
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#include <debug.h>
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DBG_DEFAULT_CHANNEL(MEMORY);
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static ULONG InstalledMemoryMb = 0;
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static ULONG AvailableMemoryMb = 0;
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#define TEST_SIZE 0x200
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#define TEST_PATTERN1 0xAA
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#define TEST_PATTERN2 0x55
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extern VOID
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SetMemory(
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PFREELDR_MEMORY_DESCRIPTOR MemoryMap,
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ULONG_PTR BaseAddress,
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SIZE_T Size,
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TYPE_OF_MEMORY MemoryType);
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extern ULONG
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PcMemFinalizeMemoryMap(
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PFREELDR_MEMORY_DESCRIPTOR MemoryMap);
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VOID
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XboxMemInit(VOID)
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{
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UCHAR ControlRegion[TEST_SIZE];
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PVOID MembaseTop = (PVOID)(64 * 1024 * 1024);
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PVOID MembaseLow = (PVOID)0;
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(*(PULONG)(0xfd000000 + 0x100200)) = 0x03070103;
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(*(PULONG)(0xfd000000 + 0x100204)) = 0x11448000;
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WRITE_PORT_ULONG((ULONG*) 0xcf8, CONFIG_CMD(0, 0, 0x84));
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WRITE_PORT_ULONG((ULONG*) 0xcfc, 0x7ffffff); /* Prep hardware for 128 Mb */
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InstalledMemoryMb = 64;
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memset(ControlRegion, TEST_PATTERN1, TEST_SIZE);
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memset(MembaseTop, TEST_PATTERN1, TEST_SIZE);
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__wbinvd();
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if (memcmp(MembaseTop, ControlRegion, TEST_SIZE) == 0)
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{
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/* Looks like there is memory .. maybe a 128MB box */
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memset(ControlRegion, TEST_PATTERN2, TEST_SIZE);
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memset(MembaseTop, TEST_PATTERN2, TEST_SIZE);
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__wbinvd();
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if (memcmp(MembaseTop, ControlRegion, TEST_SIZE) == 0)
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{
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/* Definitely looks like there is memory */
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if (memcmp(MembaseLow, ControlRegion, TEST_SIZE) == 0)
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{
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/* Hell, we find the Test-string at 0x0 too! */
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InstalledMemoryMb = 64;
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}
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else
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{
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InstalledMemoryMb = 128;
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}
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}
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}
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/* Set hardware for amount of memory detected */
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WRITE_PORT_ULONG((ULONG*) 0xcf8, CONFIG_CMD(0, 0, 0x84));
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WRITE_PORT_ULONG((ULONG*) 0xcfc, InstalledMemoryMb * 1024 * 1024 - 1);
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/* 4 MB video framebuffer is reserved later using XboxMemReserveMemory() */
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AvailableMemoryMb = InstalledMemoryMb;
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}
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FREELDR_MEMORY_DESCRIPTOR XboxMemoryMap[MAX_BIOS_DESCRIPTORS + 1];
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PFREELDR_MEMORY_DESCRIPTOR
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XboxMemGetMemoryMap(ULONG *MemoryMapSize)
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{
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TRACE("XboxMemGetMemoryMap()\n");
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/* FIXME: Obtain memory map via multiboot spec */
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/* Synthesize memory map */
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/* Available RAM block */
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SetMemory(XboxMemoryMap,
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0,
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AvailableMemoryMb * 1024 * 1024,
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LoaderFree);
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/* Video memory */
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SetMemory(XboxMemoryMap,
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AvailableMemoryMb * 1024 * 1024,
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(InstalledMemoryMb - AvailableMemoryMb) * 1024 * 1024,
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LoaderFirmwarePermanent);
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*MemoryMapSize = PcMemFinalizeMemoryMap(XboxMemoryMap);
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return XboxMemoryMap;
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}
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PVOID
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XboxMemReserveMemory(ULONG MbToReserve)
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{
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/* This function is used to reserve video framebuffer in XboxVideoInit() */
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if (InstalledMemoryMb == 0)
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{
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/* Hmm, seems we're not initialized yet */
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XboxMemInit();
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}
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if (MbToReserve > AvailableMemoryMb)
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{
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/* Can't satisfy the request */
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return NULL;
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}
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AvailableMemoryMb -= MbToReserve;
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/* Top of available memory points to the space just reserved */
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return (PVOID)(AvailableMemoryMb * 1024 * 1024);
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}
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/* EOF */
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