/*
* 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 ULONGLONG_ALIGN_DOWN_BY(size, align) \
#define ULONGLONG_ALIGN_UP_BY(size, align) \
(ULONGLONG_ALIGN_DOWN_BY(((ULONGLONG)(size) + align - 1), align))
-#define MAX_BIOS_DESCRIPTORS 80
-
BIOS_MEMORY_MAP PcBiosMemoryMap[MAX_BIOS_DESCRIPTORS];
ULONG PcBiosMapCount;
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)
{
return FALSE;
}
-static ULONG
+static
+ULONG
PcMemGetConventionalMemorySize(VOID)
{
REGS Regs;
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;
}
{
REGS Regs;
+ TRACE("GetEbdaLocation()\n");
+
/* Get the address of the Extended BIOS Data Area (EBDA).
* Int 15h, AH=C1h
* SYSTEM - RETURN EXTENDED-BIOS DATA-AREA SEGMENT ADDRESS (PS)
}
static
-ULONG
-PcMemGetBiosMemoryMap(PFREELDR_MEMORY_DESCRIPTOR MemoryMap, ULONG MaxMemoryMapSize)
+VOID
+PcMemCheckUsableMemorySize(VOID)
{
- REGS Regs;
- ULONGLONG RealBaseAddress, EndAddress, RealSize;
- TYPE_OF_MEMORY MemoryType;
ULONG Size, RequiredSize;
- ASSERT(PcBiosMapCount == 0);
-
- TRACE("PcMemGetBiosMemoryMap()\n");
+ TRACE("PcMemCheckUsableMemorySize()\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
"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') */
TRACE("Int15h AX=E820h\n");
TRACE("EAX = 0x%lx\n", Regs.x.eax);
TRACE("EBX = 0x%lx\n", Regs.x.ebx);
- TRACE("ECX = 0x%lx\n", Regs.x.ecx);
+ 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 (Regs.x.eax != 0x534D4150)
{
- WARN("BIOS doesn't support Int15h AX=E820h!\n\n");
+ WARN("BIOS doesn't support Int15h AX=E820h!\n");
break;
}
* 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\n");
+ 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)
if (EndAddress <= RealBaseAddress)
{
/* This doesn't span any page, so continue with next range */
- TRACE("Skipping aligned range < PAGE_SIZE. (PcBiosMapCount = %lu, BaseAddress = %lu, Length = %lu)\n",
+ TRACE("Skipping aligned range < PAGE_SIZE. (would-be-PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0x%llx)\n",
PcBiosMapCount,
PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
PcBiosMemoryMap[PcBiosMapCount].Length);
else
{
if (PcBiosMemoryMap[PcBiosMapCount].Type == BiosMemoryReserved)
+ {
MemoryType = LoaderFirmwarePermanent;
+ }
else
+ {
MemoryType = LoaderSpecialMemory;
+ }
/* Align down base of memory area */
RealBaseAddress = ULONGLONG_ALIGN_DOWN_BY(
/* Check if we can add this descriptor */
if (RealSize < MM_PAGE_SIZE)
{
- TRACE("Skipping aligned range < MM_PAGE_SIZE. (PcBiosMapCount = %lu, BaseAddress = %lu, Length = %lu)\n",
+ TRACE("Skipping aligned range < MM_PAGE_SIZE. (PcBiosMapCount = %lu, BaseAddress = 0x%llx, Length = 0x%llx)\n",
PcBiosMapCount,
PcBiosMemoryMap[PcBiosMapCount].BaseAddress,
PcBiosMemoryMap[PcBiosMapCount].Length);
{
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
{
* then this was the last entry, so we're done. */
if (Regs.x.ebx == 0x00000000)
{
- TRACE("End of System Memory Map! (Reset)\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,
for (i = 0; i < PcMapCount; i++)
{
/* Check for conflicting descriptor */
- if ((PcMemoryMap[i].BasePage < BasePage + PageCount) &&
- (PcMemoryMap[i].BasePage + PcMemoryMap[i].PageCount > BasePage))
+ if ((MemoryMap[i].BasePage < BasePage + PageCount) &&
+ (MemoryMap[i].BasePage + MemoryMap[i].PageCount > BasePage))
{
/* Check if the memory is free */
- if (PcMemoryMap[i].MemoryType != LoaderFree)
+ if (MemoryMap[i].MemoryType != LoaderFree)
{
FrLdrBugCheckWithMessage(
MEMORY_INIT_FAILURE,
}
/* Add the memory descriptor */
- PcMapCount = AddMemoryDescriptor(PcMemoryMap,
+ PcMapCount = AddMemoryDescriptor(MemoryMap,
MAX_BIOS_DESCRIPTORS,
BasePage,
PageCount,
VOID
SetMemory(
+ PFREELDR_MEMORY_DESCRIPTOR MemoryMap,
ULONG_PTR BaseAddress,
SIZE_T Size,
TYPE_OF_MEMORY MemoryType)
PageCount = ADDRESS_AND_SIZE_TO_SPAN_PAGES(BaseAddress, Size);
/* Add the memory descriptor */
- PcMapCount = AddMemoryDescriptor(PcMemoryMap,
+ 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 */
}
/* Setup some protected ranges */
- SetMemory(0x000000, 0x01000, LoaderFirmwarePermanent); // Realmode IVT / BDA
- SetMemory(0x0A0000, 0x50000, LoaderFirmwarePermanent); // Video memory
- SetMemory(0x0F0000, 0x10000, LoaderSpecialMemory); // ROM
- SetMemory(0xFFF000, 0x01000, LoaderSpecialMemory); // unusable memory (do we really need this?)
-
- /* Reserve some static ranges for freeldr */
- ReserveMemory(0x1000, STACKLOW - 0x1000, LoaderFirmwareTemporary, "BIOS area");
- ReserveMemory(STACKLOW, STACKADDR - STACKLOW, LoaderOsloaderStack, "FreeLdr stack");
- ReserveMemory(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 ((PcMemoryMap[i].BasePage > (FREELDR_BASE / PAGE_SIZE)) &&
- (PcMemoryMap[i].MemoryType == LoaderFree))
- {
- /* Use this range for the disk read buffer */
- DiskReadBuffer = (PVOID)(PcMemoryMap[i].BasePage * PAGE_SIZE);
- DiskReadBufferSize = min(PcMemoryMap[i].PageCount * PAGE_SIZE,
- MAX_DISKREADBUFFER_SIZE);
- break;
- }
- }
-
- TRACE("DiskReadBuffer=%p, DiskReadBufferSize=%lx\n",
- DiskReadBuffer, DiskReadBufferSize);
-
- /* Now reserve the range for the disk read buffer */
- ReserveMemory((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",
- PcMemoryMap[i].BasePage,
- PcMemoryMap[i].PageCount,
- MmGetSystemMemoryMapTypeString(PcMemoryMap[i].MemoryType));
- }
+ 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 = PcMapCount;
+ *MemoryMapSize = PcMemFinalizeMemoryMap(PcMemoryMap);
return PcMemoryMap;
}
projects / reactos.git / blobdiff