#define STACK_BASE_PAGE (STACKLOW / PAGE_SIZE)
#define FREELDR_BASE_PAGE (FREELDR_BASE / PAGE_SIZE)
#define DISKBUF_BASE_PAGE (DISKREADBUFFER / PAGE_SIZE)
-#define BIOSBUF_BASE_PAGE (BIOSCALLBUFFER / PAGE_SIZE)
#define STACK_PAGE_COUNT (FREELDR_BASE_PAGE - STACK_BASE_PAGE)
#define FREELDR_PAGE_COUNT (DISKBUF_BASE_PAGE - FREELDR_BASE_PAGE)
FREELDR_MEMORY_DESCRIPTOR PcMemoryMap[MAX_BIOS_DESCRIPTORS + 1] =
{
{ LoaderFirmwarePermanent, 0x00, 1 }, // realmode int vectors
- { LoaderFirmwareTemporary, 0x01, STACK_BASE_PAGE - 1 }, // freeldr stack + cmdline
+ { 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
- { LoaderFirmwareTemporary, BIOSBUF_BASE_PAGE, BIOSBUF_PAGE_COUNT }, // BIOSCALLBUFFER
{ LoaderFirmwarePermanent, 0x9F, 0x1 }, // EBDA
{ LoaderFirmwarePermanent, 0xA0, 0x50 }, // ROM / Video
{ LoaderSpecialMemory, 0xF0, 0x10 }, // ROM / Video
bit value at address 0x413 inside the BDA, which gives us the usable size
in KB */
Size = (*(PUSHORT)(ULONG_PTR)0x413) * 1024;
- if (Size < 0x9F000)
+ 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",
+ "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);
}
{
/* Check if this is high enough */
ULONG EbdaBase = (ULONG)Regs.w.es << 4;
- if (EbdaBase < 0x9F000)
+ if (EbdaBase < MEMORY_MARGIN)
{
FrLdrBugCheckWithMessage(
MEMORY_INIT_FAILURE,
__FILE__,
__LINE__,
- "The location of your EBDA is 0x%lx, which is too low!\n"
+ "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);
}
#define PDP_ADDRESS HEX(2000) /* One page PDP page table */
#define PD_ADDRESS HEX(3000) /* One page PD page table */
//#endif
+#define BIOSCALLBUFFER HEX(4000) /* Buffer to store temporary data for any Int386() call */
#define STACK16ADDR HEX(6F00) /* The 16-bit stack top will be at 0000:6F00 */
#define BSS_START HEX(6F00)
#define STACKLOW HEX(7000)
#define FREELDR_BASE HEX(F800)
#define FREELDR_PE_BASE HEX(10000)
#define DISKREADBUFFER HEX(8E000) /* Buffer to store data read in from the disk via the BIOS */
-#define BIOSCALLBUFFER HEX(9E000) /* Buffer to store temporary data for any Int386() call */
+#define MEMORY_MARGIN HEX(9E000) /* Highest usable address */
/* 9F000- 9FFFF is reserved for the EBDA */
#define DISKREADBUFFER_SIZE HEX(10000)