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begin implementation of memory detection

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svn path=/trunk/; revision=1471
This commit is contained in:
jean 2000-12-20 18:44:20 +00:00
parent c6010e401e
commit 90beca63cb
3 changed files with 64 additions and 3 deletions
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46
reactos/loaders/dos/loadros.asm
View file

@ -269,6 +269,52 @@ entry:
mov [_multiboot_mods_addr], eax
add dword [_multiboot_mods_addr], _multiboot_modules
;;
;; get extended memory size in KB
;;
push ebx
xor ebx,ebx
mov [_multiboot_mem_lower],ebx
mov ax, 0xe801
int 015h
cmp ebx,ebx
jz .oldstylemem
and ebx, 0xffff
shl ebx,6
mov [_multiboot_mem_lower],ebx
and eax,0xffff
add dword [_multiboot_mem_lower],eax
jmp .done_mem
.oldstylemem:
;; int 15h opt e801 don't work , try int 15h, option 88h
mov ah, 088h
int 015h
cmp ax,ax
jz .cmosmem
mov [_multiboot_mem_lower],ax
jmp .done_mem
.cmosmem:
;; int 15h opt 88h don't work , try read cmos
xor eax,eax
mov al, 0x31
out 0x70, al
in al, 0x71
and eax, 0xffff ; clear carry
shl eax,8
mov [_multiboot_mem_lower],eax
;; xor eax,eax
;; mov al, 0x30
;; out 0x70, al
;; in al, 0x71
;; and eax, 0xffff ; clear carry
;; add [_multiboot_mem_lower],eax
.done_mem:
pop ebx
;;
;; Begin the pmode initalization
;;

8
reactos/ntoskrnl/ke/main.c
View file

@ -1,4 +1,4 @@
/* $Id: main.c,v 1.66 2000/10/22 16:36:50 ekohl Exp $
/* $Id: main.c,v 1.67 2000/12/20 18:43:13 jean Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -410,6 +410,12 @@ void _main (ULONG MultiBootMagic, PLOADER_PARAMETER_BLOCK _LoaderBlock)
KeInit1();
KeLowerIrql(DISPATCH_LEVEL);
{
char tmpbuf[80];
sprintf(tmpbuf,"system with %d MB extended memory\n"
,(unsigned int)(KeLoaderBlock.MemLower)/1024);
HalDisplayString(tmpbuf);
}
/*
* Display version number and copyright/warranty message
*/

13
reactos/ntoskrnl/mm/mminit.c
View file

@ -1,4 +1,4 @@
/* $Id: mminit.c,v 1.10 2000/10/22 16:36:52 ekohl Exp $
/* $Id: mminit.c,v 1.11 2000/12/20 18:44:20 jean Exp $
*
* COPYRIGHT: See COPYING in the top directory
* PROJECT: ReactOS kernel
@ -217,10 +217,19 @@ VOID MmInit1(ULONG FirstKrnlPhysAddr,
/*
* Free physical memory not used by the kernel
*/
MmStats.NrTotalPages = KeLoaderBlock.MemLower/4;
if ( !MmStats.NrTotalPages )
{
DbgPrint("Memory not detected, default to 8 MB\n");
MmStats.NrTotalPages = 2048;
}
else
MmStats.NrTotalPages += 256;// add 1MB for standard memory (not extended)
LastKernelAddress = (ULONG)MmInitializePageList(
(PVOID)FirstKrnlPhysAddr,
(PVOID)LastKrnlPhysAddr,
1024,
// 1024,
MmStats.NrTotalPages ,
PAGE_ROUND_UP(LastKernelAddress));
kernel_len = LastKrnlPhysAddr - FirstKrnlPhysAddr;