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[NTVDM]

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Implement BIOS INT 15h functions AX = E820 (Get Memory Map) and AX = E801
(Get Memory Size for >64M Configurations).


svn path=/trunk/; revision=67609
This commit is contained in:
Aleksandar Andrejevic 2015-05-09 23:48:09 +00:00
parent 88f12ca109
commit 18f771e535
4 changed files with 102 additions and 0 deletions
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63
reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
View file

@ -27,6 +27,7 @@
#include "vidbios32.h"
#include "moubios32.h"
#include "memory.h"
#include "io.h"
#include "hardware/cmos.h"
#include "hardware/pic.h"
@ -291,6 +292,68 @@ static VOID WINAPI BiosMiscService(LPWORD Stack)
break;
}
/* Get System Memory Map */
case 0xE8:
{
if (getAL() == 0x01)
{
/* The amount of memory between 1M and 16M, in kilobytes */
ULONG Above1M = (min(MAX_ADDRESS, 0x01000000) - 0x00100000) >> 10;
/* The amount of memory above 16M, in 64K blocks */
ULONG Above16M = (MAX_ADDRESS > 0x01000000) ? (MAX_ADDRESS - 0x01000000) >> 16: 0;
setCF(0);
setAX(Above1M);
setBX(Above16M);
setCX(Above1M);
setDX(Above16M);
}
else if (getAL() == 0x20 && getEDX() == 'PAMS')
{
ULONG Offset = getEBX();
ULONG Length;
ULONG BytesWritten = 0;
BOOLEAN Hooked;
PBIOS_MEMORY_MAP Map = (PBIOS_MEMORY_MAP)SEG_OFF_TO_PTR(getES(), getDI());
/* Assume the buffer won't be large enough */
setCF(0);
while (BytesWritten < getECX() && (ULONG_PTR)Map < (MAX_ADDRESS - sizeof(BIOS_MEMORY_MAP)))
{
/* Let's ask our memory controller */
if (!MemQueryMemoryZone(Offset, &Length, &Hooked))
{
/* No more memory blocks */
setCF(1);
break;
}
Map->BaseAddress = (ULONGLONG)Offset;
Map->Length = (ULONGLONG)Length;
Map->Type = Hooked ? BIOS_MEMORY_RESERVED : BIOS_MEMORY_AVAILABLE;
/* Go to the next record */
Map++;
Offset += Length;
BytesWritten += sizeof(BIOS_MEMORY_MAP);
}
setEAX('PAMS');
setEBX(Offset);
setECX(BytesWritten);
}
else
{
DPRINT1("BIOS Function INT 15h, AH = 0xE8 - unexpected AL = %02X, EDX = %08X\n",
getAL(),
getEDX());
}
break;
}
default:
{
DPRINT1("BIOS Function INT 15h, AH = 0x%02X NOT IMPLEMENTED\n",

15
reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.h
View file

@ -15,6 +15,21 @@
/* DEFINES ********************************************************************/
enum
{
BIOS_MEMORY_AVAILABLE = 1,
BIOS_MEMORY_RESERVED = 2,
BIOS_MEMORY_ACPI_RECLAIMABLE = 3,
BIOS_MEMORY_ACPI_NVS = 4
};
typedef struct
{
ULONGLONG BaseAddress;
ULONGLONG Length;
ULONG Type;
} BIOS_MEMORY_MAP, *PBIOS_MEMORY_MAP;
// #define BIOS_EQUIPMENT_INTERRUPT 0x11
// #define BIOS_MEMORY_SIZE 0x12
// #define BIOS_MISC_INTERRUPT 0x15

16
reactos/subsystems/mvdm/ntvdm/memory.c
View file

@ -283,7 +283,23 @@ MemRemoveFastMemoryHook(PVOID Address, ULONG Size)
return TRUE;
}
BOOLEAN
MemQueryMemoryZone(ULONG StartAddress, PULONG Length, PBOOLEAN Hooked)
{
ULONG Page = StartAddress >> 12;
if (Page >= TOTAL_PAGES) return FALSE;
*Length = 0;
*Hooked = PageTable[Page] != NULL;
while (Page < TOTAL_PAGES && (PageTable[Page] != NULL) == *Hooked)
{
*Length += PAGE_SIZE;
Page++;
}
return TRUE;
}
PBYTE
WINAPI

8
reactos/subsystems/mvdm/ntvdm/memory.h
View file

@ -67,6 +67,14 @@ MemRemoveFastMemoryHook
ULONG Size
);
BOOLEAN
MemQueryMemoryZone
(
ULONG StartAddress,
PULONG Length,
PBOOLEAN Hooked
);
#endif // _MEMORY_H_
/* EOF */