#include <arch/pc/x86common.h>
#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 80ul
-
BIOS_MEMORY_MAP PcBiosMemoryMap[MAX_BIOS_DESCRIPTORS];
ULONG 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;
}
/* 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=0x%p, DiskReadBufferSize=0x%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;
}