Rijn/TempleOS-Rijn
1
1 Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

TempleOSCDV4.06.ISO

Browse Source
This commit is contained in:
Terry A. Davis authored and minexew committed 2018-09-08 21:47:19 +02:00
1 parent 6fe38d2d9d
commit b632ab9a4f
261 files changed
+6282 -5801
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

Kernel/Mem/PageTables.CPP
+6 -53
View File
@@ -2,54 +2,18 @@ asm {
// $LK,"::/Doc/MemOverview.TXT"$
USE32
SYS_INIT_MEM::
SYS_INIT_PAGE_TABLES::
//Set page tables to identity map everything.
MOV EDI,SYS_FIXED_AREA
XOR EAX,EAX
MOV ECX,sizeof(CSysFixedArea)/4
REP_STOSD //Init entire SYS_FIXED_AREA to zero
//PML1
MOV EAX,0x107
XOR EDX,EDX
MOV EDI,SYS_FIXED_AREA+CSysFixedArea.pml1
MOV ECX,MEM_NUM_PML1*0x200
@@05: MOV U32 [EDI],EAX
ADD EDI,4
MOV U32 [EDI],EDX
ADD EDI,4
ADD EAX,0x1000
ADC EDX,0
LOOP @@05
//0xA0000-0xBFFFF: video ram=write thru
MOV EAX,0xF
XOR EDX,EDX
MOV EDI,SYS_FIXED_AREA+CSysFixedArea.pml1+0xA0*8
MOV ECX,0xC0-0xA0
@@10: OR U32 [EDI],EAX
ADD EDI,4
OR U32 [EDI],EDX
ADD EDI,4
LOOP @@10
//PML2
MOV EAX,SYS_FIXED_AREA+CSysFixedArea.pml1+7
MOV EAX,0x87 //bit 7 is page size (1==2Meg)
XOR EDX,EDX
MOV EDI,SYS_FIXED_AREA+CSysFixedArea.pml2
MOV ECX,MEM_NUM_PML1
@@15: MOV U32 [EDI],EAX
ADD EDI,4
MOV U32 [EDI],EDX
ADD EDI,4
ADD EAX,0x1000
ADC EDX,0
LOOP @@15
MOV EAX,MEM_NUM_PML1*0x200000+0x87 //bit 7 is page size (1==2Meg)
XOR EDX,EDX
MOV EDI,SYS_FIXED_AREA+CSysFixedArea.pml2+8*MEM_NUM_PML1
MOV ECX,MEM_NUM_PML2*0x200-MEM_NUM_PML1
MOV ECX,MEM_NUM_PML2*0x200
@@20: MOV U32 [EDI],EAX
ADD EDI,4
MOV U32 [EDI],EDX
@@ -151,31 +115,20 @@ pain without MAlloc up-and-running.
RET
}
I64 MemPageSize(U8 *a)
{//Size of page table at addr.Either 4K or 2Meg.
if (a<MEM_NUM_PML1*0x1000*0x200)
return 0x1000;
else
return 0x200000;
}
I64 *MemPageTable(U8 *a)
{//Point to page table entry for addr.
if (a<MEM_NUM_PML1*0x1000*0x200)
return SYS_FIXED_AREA+offset(CSysFixedArea.pml1)+a>>12*8;
else
return SYS_FIXED_AREA+offset(CSysFixedArea.pml2)+a>>21*8;
return SYS_FIXED_AREA+offset(CSysFixedArea.pml2)+a>>21*8;
}
Bool MemPagePresentMark(U8 *a,Bool val)
{//Mark an addr's page present or not-present.
I64 *pte=MemPageTable(a);
Bool result=*pte&1;
Bool res=*pte&1;
if (val)
*pte=*pte|1; //Mark present
else
*pte=*pte&~1; //Mark not present
InvlPg(a);
return result;
return res;
}