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Rev 25 Rev 103
Line 23... Line 23...
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    mov   ebx,general_page_table ;write address to [general_page_table]
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    mov   ebx,general_page_table ;write address to [general_page_table]
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    call  MEM_Alloc_Pages        ;allocate page directory
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    call  MEM_Alloc_Pages        ;allocate page directory
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    mov   eax,[general_page_table]
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    mov   eax,[general_page_table]
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    call  MEM_Get_Linear_Address ;eax - linear address of page directory
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    call  MEM_Get_Linear_Address ;eax - linear address of page directory
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    mov   edi,eax
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    mov   edi,eax
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    mov   ebx,eax
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    mov   ebx,eax                ;copy address of page directory to safe place
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    xor   eax,eax
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    xor   eax,eax
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    mov   ecx,4096/4
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    mov   ecx,4096/4
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    cld
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    cld
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    rep   stosd                  ;clear page directory
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    rep   stosd                  ;clear page directory
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    call  MEM_Get_Linear_Address
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    call  MEM_Get_Linear_Address
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;eax - linear address of page table
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;eax - linear address of page table
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    mov   ecx,4096/4
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    mov   ecx,4096/4
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;ecx (counter) - number of pages in page table
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;ecx (counter) - number of pages in page table
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;current address=4Mb*esi
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;current address=4Mb*esi
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    cmp   esi,2
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    jz    .start_lfb_map         ;lfb map begin at 0x800000
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    cmp   esi,3
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    jz    .end_lfb_map           ;lfb map end at 0xC00000
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    jmp   .loop1
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.start_lfb_map:
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;current address=lfb address
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    mov   ebp,[0x2f0000+0x9018]
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    add   ebp,7                  ;add flags
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    jmp   .loop1
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.end_lfb_map:
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;current address=linear address
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    mov   ebp,12*0x100000+7
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.loop1:
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.loop1:
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    mov   [eax],ebp              ;write page address (with flags) in page table
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    mov   [eax],ebp              ;write page address (with flags) in page table
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    add   eax,4
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    add   eax,4
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    inc   esi                    ;next page directory entry
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    inc   esi                    ;next page directory entry
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    cmp   esi,edx
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    cmp   esi,edx
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    jnz   .loop
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    jnz   .loop
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;map region 0x80000000-0x803fffff to 0x800000-0xcfffff
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;map region 0x80000000-0x807fffff to LFB
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    mov   eax,1                  ;size of the region is 4Mb so only 1 page table needed
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    mov   eax,2                  ;size of the region is 4Mb so only 1 page table needed
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    mov   edx,ebx                ;ebx still contains linear address of the page directory
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    mov   edx,ebx                ;ebx still contains linear address of the page directory
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    add   ebx,0x800
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    add   ebx,0x800
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    call  MEM_Alloc_Pages        ;alloc page table for the region
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    call  MEM_Alloc_Pages        ;alloc page table for the region
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    mov   eax,[ebx]
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    mov   eax,[ebx]
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    add   dword [ebx],7          ;add flags
 - 
 
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    call  MEM_Get_Linear_Address ;get linear address of the page table
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    add   dword [ebx],7          ;add flags
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    mov   ebx,eax
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    call  MEM_Get_Linear_Address ;get linear address of the page table
- 
 
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    mov   ecx,4096/4             ;number of pages in page table
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    mov   ecx,4096/4             ;number of pages in page table
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    mov   edi,[0xfe80]
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    mov   eax,8*0x100000+7
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    add   edi,7
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.loop3:
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.loop3:
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;ebx - linear address of page table
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;eax - linear address of page table
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;eax - current linear address with flags
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;edi - current linear address with flags
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    mov   [ebx],eax
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    mov   [eax],edi
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    add   ebx,4
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    add   eax,4
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    add   edi,4096
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    loop  .loop3
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    mov   eax,[ebx+4]
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    call  MEM_Get_Linear_Address
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    add   dword [ebx+4],7
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    mov   ecx,4096/4
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.loop31:
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    mov   [eax],edi
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    add   eax,4
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    add   eax,4096
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    add   edi,4096
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    loop  .loop3
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    loop  .loop31
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;map region 0xC0000000-* to 0x0-*
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;map region 0xC0000000-* to 0x0-*