/*
* FreeLoader
*
+ * Copyright ... ... (See below.)
+ * Copyright 2017 Serge Gautherie <reactos-git_serge_171003@gautherie.fr>
+ *
* This program 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 2 of the License, or
#include <freeldr.h>
#include <arch/pc/x86common.h>
-#define NDEBUG
#include <debug.h>
-
DBG_DEFAULT_CHANNEL(MEMORY);
-#define MAX_BIOS_DESCRIPTORS 32
-
-#define STACK_BASE_PAGE (STACKLOW / PAGE_SIZE)
-#define FREELDR_BASE_PAGE (FREELDR_BASE / PAGE_SIZE)
-#define DISKBUF_BASE_PAGE (DISKREADBUFFER / PAGE_SIZE)
+#define ULONGLONG_ALIGN_DOWN_BY(size, align) \
+ ((ULONGLONG)(size) & ~((ULONGLONG)(align) - 1))
-#define STACK_PAGE_COUNT (FREELDR_BASE_PAGE - STACK_BASE_PAGE)
-#define FREELDR_PAGE_COUNT (DISKBUF_BASE_PAGE - FREELDR_BASE_PAGE)
-#define DISKBUF_PAGE_COUNT (0x10)
-#define BIOSBUF_PAGE_COUNT (1)
+#define ULONGLONG_ALIGN_UP_BY(size, align) \
+ (ULONGLONG_ALIGN_DOWN_BY(((ULONGLONG)(size) + align - 1), align))
BIOS_MEMORY_MAP PcBiosMemoryMap[MAX_BIOS_DESCRIPTORS];
ULONG PcBiosMapCount;
-FREELDR_MEMORY_DESCRIPTOR PcMemoryMap[MAX_BIOS_DESCRIPTORS + 1] =
-{
- { LoaderFirmwarePermanent, 0x00, 1 }, // realmode int vectors
- { LoaderFirmwareTemporary, 0x01, STACK_BASE_PAGE - 1 }, // freeldr stack, cmdline, BIOS call buffer
- { LoaderOsloaderStack, STACK_BASE_PAGE, FREELDR_BASE_PAGE - STACK_BASE_PAGE }, // prot mode stack.
- { LoaderLoadedProgram, FREELDR_BASE_PAGE, FREELDR_PAGE_COUNT }, // freeldr image
- { LoaderFirmwareTemporary, DISKBUF_BASE_PAGE, DISKBUF_PAGE_COUNT }, // Disk read buffer for int 13h. DISKREADBUFFER
- { LoaderFirmwarePermanent, 0x9F, 0x1 }, // EBDA
- { LoaderFirmwarePermanent, 0xA0, 0x50 }, // ROM / Video
- { LoaderSpecialMemory, 0xF0, 0x10 }, // ROM / Video
- { LoaderSpecialMemory, 0xFFF, 1 }, // unusable memory
- { 0, 0, 0 }, // end of map
-};
+FREELDR_MEMORY_DESCRIPTOR PcMemoryMap[MAX_BIOS_DESCRIPTORS + 1];
+ULONG PcMapCount;
ULONG
AddMemoryDescriptor(
TRACE("BX = 0x%x\n", RegsOut.w.bx);
TRACE("CX = 0x%x\n", RegsOut.w.cx);
TRACE("DX = 0x%x\n", RegsOut.w.dx);
- TRACE("CF set = %s\n\n", (RegsOut.x.eflags & EFLAGS_CF) ? "TRUE" : "FALSE");
+ TRACE("CF set = %s\n", (RegsOut.x.eflags & EFLAGS_CF) ? "TRUE" : "FALSE");
if (INT386_SUCCESS(RegsOut))
{
TRACE("Int15h AH=88h\n");
TRACE("AX = 0x%x\n", RegsOut.w.ax);
- TRACE("CF set = %s\n\n", (RegsOut.x.eflags & EFLAGS_CF) ? "TRUE" : "FALSE");
+ TRACE("CF set = %s\n", (RegsOut.x.eflags & EFLAGS_CF) ? "TRUE" : "FALSE");
if (INT386_SUCCESS(RegsOut) && RegsOut.w.ax != 0)
{
*pMemoryAtOneMB = (*pMemoryAtOneMB << 8);
TRACE("Int15h Failed\n");
- TRACE("CMOS reports: 0x%x\n", *pMemoryAtOneMB);
+ TRACE("CMOS reports: 0x%lx\n", *pMemoryAtOneMB);
if (*pMemoryAtOneMB != 0)
{
return FALSE;
}
-static ULONG
+static
+ULONG
PcMemGetConventionalMemorySize(VOID)
{
REGS Regs;
- TRACE("GetConventionalMemorySize()\n");
+ TRACE("PcMemGetConventionalMemorySize()\n");
/* Int 12h
* BIOS - GET MEMORY SIZE
Int386(0x12, &Regs, &Regs);
TRACE("Int12h\n");
- TRACE("AX = 0x%x\n\n", Regs.w.ax);
+ TRACE("AX = 0x%x\n", Regs.w.ax);
return (ULONG)Regs.w.ax;
}
static
-ULONG
-PcMemGetBiosMemoryMap(PFREELDR_MEMORY_DESCRIPTOR MemoryMap, ULONG MaxMemoryMapSize)
+BOOLEAN
+GetEbdaLocation(
+ PULONG BaseAddress,
+ PULONG Size)
{
REGS Regs;
- ULONG MapCount = 0;
- ULONGLONG RealBaseAddress, RealSize;
- TYPE_OF_MEMORY MemoryType;
- ULONG Size;
- ASSERT(PcBiosMapCount == 0);
- TRACE("GetBiosMemoryMap()\n");
-
- /* Make sure the usable memory is large enough. To do this we check the 16
- bit value at address 0x413 inside the BDA, which gives us the usable size
- in KB */
- Size = (*(PUSHORT)(ULONG_PTR)0x413) * 1024;
- if (Size < MEMORY_MARGIN)
- {
- FrLdrBugCheckWithMessage(
- MEMORY_INIT_FAILURE,
- __FILE__,
- __LINE__,
- "The BIOS reported a usable memory range up to 0x%x, which is too small!\n\n"
- "If you see this, please report to the ReactOS team!",
- Size);
- }
+ TRACE("GetEbdaLocation()\n");
/* Get the address of the Extended BIOS Data Area (EBDA).
* Int 15h, AH=C1h
Int386(0x15, &Regs, &Regs);
/* If the function fails, there is no EBDA */
- if (INT386_SUCCESS(Regs))
+ if (!INT386_SUCCESS(Regs))
{
- /* Check if this is high enough */
- ULONG EbdaBase = (ULONG)Regs.w.es << 4;
- if (EbdaBase < MEMORY_MARGIN)
- {
- FrLdrBugCheckWithMessage(
- MEMORY_INIT_FAILURE,
- __FILE__,
- __LINE__,
- "The location of your EBDA is 0x%lx, which is too low!\n\n"
- "If you see this, please report to the ReactOS team!",
- EbdaBase);
- }
+ return FALSE;
+ }
+
+ /* Get Base address and (maximum) size */
+ *BaseAddress = (ULONG)Regs.w.es << 4;
+ *Size = 0xA0000 - *BaseAddress;
+ return TRUE;
+}
+
+static
+VOID
+PcMemCheckUsableMemorySize(VOID)
+{
+ ULONG Size, RequiredSize;
- /* Calculate the (max) size of the EBDA */
- Size = 0xA0000 - EbdaBase;
+ TRACE("PcMemCheckUsableMemorySize()\n");
- /* Add the descriptor */
- MapCount = AddMemoryDescriptor(PcMemoryMap,
- MAX_BIOS_DESCRIPTORS,
- (EbdaBase / MM_PAGE_SIZE),
- (Size / MM_PAGE_SIZE),
- LoaderFirmwarePermanent);
+ /* Make sure the usable memory is large enough. To do this we check the 16
+ bit value at address 0x413 inside the BDA, which gives us the usable size
+ in KB */
+ Size = (*(PUSHORT)(ULONG_PTR)0x413) * 1024;
+ RequiredSize = FREELDR_BASE + FrLdrImageSize + PAGE_SIZE;
+ if (Size < RequiredSize)
+ {
+ FrLdrBugCheckWithMessage(
+ MEMORY_INIT_FAILURE,
+ __FILE__,
+ __LINE__,
+ "The BIOS reported a usable memory range up to 0x%lx, which is too small!\n"
+ "Required size is 0x%lx\n\n"
+ "If you see this, please report to the ReactOS team!",
+ Size, RequiredSize);
}
+}
+
+static
+ULONG
+PcMemGetBiosMemoryMap(PFREELDR_MEMORY_DESCRIPTOR MemoryMap, ULONG MaxMemoryMapSize)
+{
+ REGS Regs;
+ ULONGLONG RealBaseAddress, EndAddress, RealSize;
+ TYPE_OF_MEMORY MemoryType;
+
+ ASSERT(PcBiosMapCount == 0);
+
+ TRACE("PcMemGetBiosMemoryMap()\n");
/* Int 15h AX=E820h
* Newer BIOSes - GET SYSTEM MEMORY MAP
while (PcBiosMapCount < MAX_BIOS_DESCRIPTORS)
{
+ /* ACPI 3.0/4.0: Set Extended Attributes to enabled/valid by default, in case entry has no E.A.. */
+ ((PBIOS_MEMORY_MAP)BIOSCALLBUFFER)->ExtendedAttributesAsULONG = 0;
+ ((PBIOS_MEMORY_MAP)BIOSCALLBUFFER)->ExtendedAttributes.Enabled_Reserved = 1;
+
/* Setup the registers for the BIOS call */
Regs.x.eax = 0x0000E820;
Regs.x.edx = 0x534D4150; /* ('SMAP') */
Regs.w.di = BIOSCALLBUFOFFSET;
Int386(0x15, &Regs, &Regs);
- TRACE("Memory Map Entry %d\n", PcBiosMapCount);
+ TRACE("Memory Map Entry %lu\n", PcBiosMapCount);
TRACE("Int15h AX=E820h\n");
- TRACE("EAX = 0x%x\n", Regs.x.eax);
- TRACE("EBX = 0x%x\n", Regs.x.ebx);
- TRACE("ECX = 0x%x\n", Regs.x.ecx);
+ TRACE("EAX = 0x%lx\n", Regs.x.eax);
+ TRACE("EBX = 0x%lx\n", Regs.x.ebx);
+ TRACE("ECX = %lu\n", Regs.x.ecx);
TRACE("CF set = %s\n", (Regs.x.eflags & EFLAGS_CF) ? "TRUE" : "FALSE");
/* If the BIOS didn't return 'SMAP' in EAX then
- * it doesn't support this call. If CF is set, we're done */
- if (Regs.x.eax != 0x534D4150 || !INT386_SUCCESS(Regs))
+ * it doesn't support this call. */
+ if (Regs.x.eax != 0x534D4150)
+ {
+ WARN("BIOS doesn't support Int15h AX=E820h!\n");
+ break;
+ }
+
+ /* If the carry flag is set,
+ * then this call was past the last entry, so we're done. */
+ if (!INT386_SUCCESS(Regs))
{
+ TRACE("End of System Memory Map! (Past last)\n");
break;
}
+ if (Regs.x.ecx == 0)
+ {
+ TRACE("Discard empty entry. (would-be-PcBiosMapCount = %lu)\n",
+ PcBiosMapCount);
+ goto nextRange;
+ }
+
+ /* Extra safety: unexpected entry length.
+ * All in-between values are valid too, as x86 is little-indian
+ * and only lower byte is used per ACPI 6.2-A.
+ */
+ if (Regs.x.ecx < RTL_SIZEOF_THROUGH_FIELD(BIOS_MEMORY_MAP, Type) ||
+ Regs.x.ecx > sizeof(BIOS_MEMORY_MAP))
+ {
+ ERR("Int 15h AX=E820h returned an invalid entry length! (would-be-PcBiosMapCount = %lu, Entry length = (%Iu <=) %lu (<= %Iu))\n",
+ PcBiosMapCount, RTL_SIZEOF_THROUGH_FIELD(BIOS_MEMORY_MAP, Type), Regs.x.ecx, sizeof(BIOS_MEMORY_MAP));
+ /* Warn user, unless wrong case is "first and not too big entry", which is otherwise harmless. */
+ if (PcBiosMapCount > 0 || Regs.x.ecx > sizeof(BIOS_MEMORY_MAP))
+ {
+ ASSERTMSG("Int 15h AX=E820h returned an invalid entry length!\n", FALSE);
+ }
+ /* We keep previous entries (if any), but do not dare trying next entries.
+ * We assume these entries are good to use as is. If they are not, we are in trouble...
+ * (And don't ask what happens if BIOS actually overflowed our entry buffer...)
+ *
+ * FIXME: Safer = revert previous entries, Safest = blacklist this BIOS.
+ */
+ break;
+ }
+
+ if (((PBIOS_MEMORY_MAP)BIOSCALLBUFFER)->ExtendedAttributes.Enabled_Reserved == 0)
+ {
+ WARN("Discard disabled/invalid entry. (would-be-PcBiosMapCount = %lu)\n",
+ PcBiosMapCount);
+ /* This unlikely case was correct between ACPI 3.0 and 4.0, so assume all is fine.
+ * Unless we would be ready to drop ACPI 3.0 compatibility.
+ */
+ goto nextRange;
+ }
+
/* Copy data to global buffer */
- RtlCopyMemory(&PcBiosMemoryMap[PcBiosMapCount], (PVOID)BIOSCALLBUFFER, Regs.x.ecx);
+ RtlCopyMemory(&PcBiosMemoryMap[PcBiosMapCount], (PVOID)BIOSCALLBUFFER, sizeof(BIOS_MEMORY_MAP));
TRACE("BaseAddress: 0x%llx\n", PcBiosMemoryMap[PcBiosMapCount].BaseAddress);
TRACE("Length: 0x%llx\n", PcBiosMemoryMap[PcBiosMapCount].Length);
TRACE("Type: 0x%lx\n", PcBiosMemoryMap[PcBiosMapCount].Type);
- TRACE("Reserved: 0x%lx\n", PcBiosMemoryMap[PcBiosMapCount].Reserved);
- TRACE("\n");
+ TRACE("ExtendedAttributesAsULONG: 0x%08lx\n", PcBiosMemoryMap[PcBiosMapCount].ExtendedAttributesAsULONG);
+
+ if (PcBiosMemoryMap[PcBiosMapCount].ExtendedAttributes.ErrorLog == 1)
+ {
+ FIXME("EA.ErrorLog = 1. Please report this to CORE-14150. "
+ "(PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0x%llx, Type = 0x%lx, ExtendedAttributesAsULONG = 0x%08lx)\n",
+ PcBiosMapCount,
+ PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
+ PcBiosMemoryMap[PcBiosMapCount].Length,
+ PcBiosMemoryMap[PcBiosMapCount].Type,
+ PcBiosMemoryMap[PcBiosMapCount].ExtendedAttributesAsULONG);
+ // NotWantedForPublicBuilds: ASSERTMSG("EA.ErrorLog = 1. Check/Report then CONTinue.\n", FALSE);
+ }
+
+ if (PcBiosMemoryMap[PcBiosMapCount].Length == 0)
+ {
+ TRACE("Discard empty range. (would-be-PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0)\n",
+ PcBiosMapCount, PcBiosMemoryMap[PcBiosMapCount].BaseAddress);
+ goto nextRange;
+ }
/* Check if this is free memory */
if (PcBiosMemoryMap[PcBiosMapCount].Type == BiosMemoryUsable)
{
MemoryType = LoaderFree;
- /* Align up base of memory area */
- RealBaseAddress = PcBiosMemoryMap[PcBiosMapCount].BaseAddress & ~(MM_PAGE_SIZE - 1ULL);
-
- /* Calculate the length after aligning the base */
- RealSize = PcBiosMemoryMap[PcBiosMapCount].BaseAddress +
- PcBiosMemoryMap[PcBiosMapCount].Length - RealBaseAddress;
- RealSize = (RealSize + MM_PAGE_SIZE - 1) & ~(MM_PAGE_SIZE - 1ULL);
+ /* Align up base of memory range */
+ RealBaseAddress = ULONGLONG_ALIGN_UP_BY(
+ PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
+ PAGE_SIZE);
+
+ /* Calculate aligned EndAddress */
+ EndAddress = PcBiosMemoryMap[PcBiosMapCount].BaseAddress +
+ PcBiosMemoryMap[PcBiosMapCount].Length;
+ EndAddress = ULONGLONG_ALIGN_DOWN_BY(EndAddress, PAGE_SIZE);
+
+ /* Check if there is anything left */
+ if (EndAddress <= RealBaseAddress)
+ {
+ /* This doesn't span any page, so continue with next range */
+ TRACE("Skipping aligned range < PAGE_SIZE. (would-be-PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0x%llx)\n",
+ PcBiosMapCount,
+ PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
+ PcBiosMemoryMap[PcBiosMapCount].Length);
+ goto nextRange;
+ }
+
+ /* Calculate the length of the aligned range */
+ RealSize = EndAddress - RealBaseAddress;
}
else
{
if (PcBiosMemoryMap[PcBiosMapCount].Type == BiosMemoryReserved)
+ {
MemoryType = LoaderFirmwarePermanent;
+ }
else
+ {
MemoryType = LoaderSpecialMemory;
+ }
/* Align down base of memory area */
- RealBaseAddress = PcBiosMemoryMap[PcBiosMapCount].BaseAddress & ~(MM_PAGE_SIZE - 1ULL);
+ RealBaseAddress = ULONGLONG_ALIGN_DOWN_BY(
+ PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
+ PAGE_SIZE);
+
/* Calculate the length after aligning the base */
RealSize = PcBiosMemoryMap[PcBiosMapCount].BaseAddress +
PcBiosMemoryMap[PcBiosMapCount].Length - RealBaseAddress;
- RealSize = (RealSize + MM_PAGE_SIZE - 1) & ~(MM_PAGE_SIZE - 1ULL);
+ RealSize = ULONGLONG_ALIGN_UP_BY(RealSize, PAGE_SIZE);
}
/* Check if we can add this descriptor */
- if ((RealSize >= MM_PAGE_SIZE) && (MapCount < MaxMemoryMapSize))
+ if (RealSize < MM_PAGE_SIZE)
+ {
+ TRACE("Skipping aligned range < MM_PAGE_SIZE. (PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0x%llx)\n",
+ PcBiosMapCount,
+ PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
+ PcBiosMemoryMap[PcBiosMapCount].Length);
+ }
+ else if (PcMapCount >= MaxMemoryMapSize)
+ {
+ ERR("PcMemoryMap is already full! (PcBiosMapCount = %lu, PcMapCount = %lu (>= %lu))\n",
+ PcBiosMapCount, PcMapCount, MaxMemoryMapSize);
+ // NotWantedForPublicBuilds: ASSERTMSG("PcMemoryMap is already full!\n", FALSE);
+ /* We keep previous entries, and half-retrieve current/next entries.
+ * We assume all these entries are good to use as is. If they are not, we are in trouble...
+ *
+ * FIXME: Safer = revert (half-)retrieved entries, Safest = increase MaxMemoryMapSize.
+ */
+ }
+ else
{
/* Add the descriptor */
- MapCount = AddMemoryDescriptor(PcMemoryMap,
+ PcMapCount = AddMemoryDescriptor(PcMemoryMap,
MAX_BIOS_DESCRIPTORS,
(PFN_NUMBER)(RealBaseAddress / MM_PAGE_SIZE),
(PFN_NUMBER)(RealSize / MM_PAGE_SIZE),
PcBiosMapCount++;
- /* If the continuation value is zero or the
- * carry flag is set then this was
- * the last entry so we're done */
+nextRange:
+ /* If the continuation value is zero,
+ * then this was the last entry, so we're done. */
if (Regs.x.ebx == 0x00000000)
{
- TRACE("End Of System Memory Map!\n\n");
+ TRACE("End of System Memory Map! (Reset)\n");
break;
}
+ }
+ /* Check whether there would be more entries to process. */
+ if (PcBiosMapCount >= MAX_BIOS_DESCRIPTORS && Regs.x.ebx != 0x00000000)
+ {
+ ERR("PcBiosMemoryMap is already full! (PcBiosMapCount = %lu (>= %lu), PcMapCount = %lu)\n",
+ PcBiosMapCount, MAX_BIOS_DESCRIPTORS, PcMapCount);
+ // NotWantedForPublicBuilds: ASSERTMSG("PcBiosMemoryMap is already full!\n", FALSE);
+ /* We keep retrieved entries, but ignore next entries.
+ * We assume these entries are good to use as is. If they are not, we are in trouble...
+ *
+ * FIXME: Safer = revert retrieved entries, Safest = increase MAX_BIOS_DESCRIPTORS.
+ */
+ }
+
+ TRACE("PcMemGetBiosMemoryMap end: PcBiosMapCount = %lu\n", PcBiosMapCount);
+ return PcBiosMapCount;
+}
+
+VOID
+ReserveMemory(
+ PFREELDR_MEMORY_DESCRIPTOR MemoryMap,
+ ULONG_PTR BaseAddress,
+ SIZE_T Size,
+ TYPE_OF_MEMORY MemoryType,
+ PCHAR Usage)
+{
+ ULONG_PTR BasePage, PageCount;
+ ULONG i;
+
+ BasePage = BaseAddress / PAGE_SIZE;
+ PageCount = ADDRESS_AND_SIZE_TO_SPAN_PAGES(BaseAddress, Size);
+ for (i = 0; i < PcMapCount; i++)
+ {
+ /* Check for conflicting descriptor */
+ if ((MemoryMap[i].BasePage < BasePage + PageCount) &&
+ (MemoryMap[i].BasePage + MemoryMap[i].PageCount > BasePage))
+ {
+ /* Check if the memory is free */
+ if (MemoryMap[i].MemoryType != LoaderFree)
+ {
+ FrLdrBugCheckWithMessage(
+ MEMORY_INIT_FAILURE,
+ __FILE__,
+ __LINE__,
+ "Failed to reserve memory in the range 0x%Ix - 0x%Ix for %s",
+ BaseAddress,
+ Size,
+ Usage);
+ }
+ }
}
- return MapCount;
+ /* Add the memory descriptor */
+ PcMapCount = AddMemoryDescriptor(MemoryMap,
+ MAX_BIOS_DESCRIPTORS,
+ BasePage,
+ PageCount,
+ MemoryType);
+}
+
+VOID
+SetMemory(
+ PFREELDR_MEMORY_DESCRIPTOR MemoryMap,
+ ULONG_PTR BaseAddress,
+ SIZE_T Size,
+ TYPE_OF_MEMORY MemoryType)
+{
+ ULONG_PTR BasePage, PageCount;
+
+ BasePage = BaseAddress / PAGE_SIZE;
+ PageCount = ADDRESS_AND_SIZE_TO_SPAN_PAGES(BaseAddress, Size);
+
+ /* Add the memory descriptor */
+ PcMapCount = AddMemoryDescriptor(MemoryMap,
+ MAX_BIOS_DESCRIPTORS,
+ BasePage,
+ PageCount,
+ MemoryType);
}
+ULONG
+PcMemFinalizeMemoryMap(
+ PFREELDR_MEMORY_DESCRIPTOR MemoryMap)
+{
+ ULONG i;
+
+ /* Reserve some static ranges for freeldr */
+ ReserveMemory(MemoryMap, 0x1000, STACKLOW - 0x1000, LoaderFirmwareTemporary, "BIOS area");
+ ReserveMemory(MemoryMap, STACKLOW, STACKADDR - STACKLOW, LoaderOsloaderStack, "FreeLdr stack");
+ ReserveMemory(MemoryMap, FREELDR_BASE, FrLdrImageSize, LoaderLoadedProgram, "FreeLdr image");
+
+ /* Default to 1 page above freeldr for the disk read buffer */
+ DiskReadBuffer = (PUCHAR)ALIGN_UP_BY(FREELDR_BASE + FrLdrImageSize, PAGE_SIZE);
+ DiskReadBufferSize = PAGE_SIZE;
+
+ /* Scan for free range above freeldr image */
+ for (i = 0; i < PcMapCount; i++)
+ {
+ if ((MemoryMap[i].BasePage > (FREELDR_BASE / PAGE_SIZE)) &&
+ (MemoryMap[i].MemoryType == LoaderFree))
+ {
+ /* Use this range for the disk read buffer */
+ DiskReadBuffer = (PVOID)(MemoryMap[i].BasePage * PAGE_SIZE);
+ DiskReadBufferSize = min(MemoryMap[i].PageCount * PAGE_SIZE,
+ MAX_DISKREADBUFFER_SIZE);
+ break;
+ }
+ }
+
+ TRACE("DiskReadBuffer=0x%p, DiskReadBufferSize=0x%lx\n",
+ DiskReadBuffer, DiskReadBufferSize);
+
+ ASSERT(DiskReadBufferSize > 0);
+
+ /* Now reserve the range for the disk read buffer */
+ ReserveMemory(MemoryMap,
+ (ULONG_PTR)DiskReadBuffer,
+ DiskReadBufferSize,
+ LoaderFirmwareTemporary,
+ "Disk read buffer");
+
+ TRACE("Dumping resulting memory map:\n");
+ for (i = 0; i < PcMapCount; i++)
+ {
+ TRACE("BasePage=0x%lx, PageCount=0x%lx, Type=%s\n",
+ MemoryMap[i].BasePage,
+ MemoryMap[i].PageCount,
+ MmGetSystemMemoryMapTypeString(MemoryMap[i].MemoryType));
+ }
+ return PcMapCount;
+}
PFREELDR_MEMORY_DESCRIPTOR
PcMemGetMemoryMap(ULONG *MemoryMapSize)
{
- ULONG i, EntryCount;
+ ULONG EntryCount;
ULONG ExtendedMemorySizeAtOneMB;
ULONG ExtendedMemorySizeAtSixteenMB;
+ ULONG EbdaBase, EbdaSize;
+
+ TRACE("PcMemGetMemoryMap()\n");
+
+ PcMemCheckUsableMemorySize();
EntryCount = PcMemGetBiosMemoryMap(PcMemoryMap, MAX_BIOS_DESCRIPTORS);
/* If the BIOS didn't provide a memory map, synthesize one */
- if (0 == EntryCount)
+ if (EntryCount == 0)
{
- GetExtendedMemoryConfiguration(&ExtendedMemorySizeAtOneMB, &ExtendedMemorySizeAtSixteenMB);
+ GetExtendedMemoryConfiguration(&ExtendedMemorySizeAtOneMB,
+ &ExtendedMemorySizeAtSixteenMB);
/* Conventional memory */
AddMemoryDescriptor(PcMemoryMap,
LoaderFree);
/* Extended memory */
- EntryCount = AddMemoryDescriptor(PcMemoryMap,
+ PcMapCount = AddMemoryDescriptor(PcMemoryMap,
MAX_BIOS_DESCRIPTORS,
1024 * 1024 / PAGE_SIZE,
ExtendedMemorySizeAtOneMB * 1024 / PAGE_SIZE,
if (ExtendedMemorySizeAtSixteenMB != 0)
{
/* Extended memory at 16MB */
- EntryCount = AddMemoryDescriptor(PcMemoryMap,
+ PcMapCount = AddMemoryDescriptor(PcMemoryMap,
MAX_BIOS_DESCRIPTORS,
0x1000000 / PAGE_SIZE,
ExtendedMemorySizeAtSixteenMB * 64 * 1024 / PAGE_SIZE,
LoaderFree);
}
- }
- TRACE("Dumping resulting memory map:\n");
- for (i = 0; i < EntryCount; i++)
- {
- TRACE("BasePage=0x%lx, PageCount=0x%lx, Type=%s\n",
- PcMemoryMap[i].BasePage,
- PcMemoryMap[i].PageCount,
- MmGetSystemMemoryMapTypeString(PcMemoryMap[i].MemoryType));
+ /* Check if we have an EBDA and get it's location */
+ if (GetEbdaLocation(&EbdaBase, &EbdaSize))
+ {
+ /* Add the descriptor */
+ PcMapCount = AddMemoryDescriptor(PcMemoryMap,
+ MAX_BIOS_DESCRIPTORS,
+ (EbdaBase / PAGE_SIZE),
+ ADDRESS_AND_SIZE_TO_SPAN_PAGES(EbdaBase, EbdaSize),
+ LoaderFirmwarePermanent);
+ }
}
- *MemoryMapSize = EntryCount;
+ /* Setup some protected ranges */
+ SetMemory(PcMemoryMap, 0x000000, 0x01000, LoaderFirmwarePermanent); // Realmode IVT / BDA
+ SetMemory(PcMemoryMap, 0x0A0000, 0x50000, LoaderFirmwarePermanent); // Video memory
+ SetMemory(PcMemoryMap, 0x0F0000, 0x10000, LoaderSpecialMemory); // ROM
+ SetMemory(PcMemoryMap, 0xFFF000, 0x01000, LoaderSpecialMemory); // unusable memory (do we really need this?)
+ *MemoryMapSize = PcMemFinalizeMemoryMap(PcMemoryMap);
return PcMemoryMap;
}
+
/* EOF */
projects / reactos.git / blobdiff