Subversion Repositories Kolibri OS

$Revision: 838 $

MEM_WC     equ 1               ;write combined memory

MEM_UC     equ 0               ;uncached memory

align 4

proc init_mem

           mov ecx, [0x2F0000 + 0x9100]

           mov esi, 0x2F0000 + 0x9104

           xor eax, eax

@@:

           cmp dword [esi+16], 1

           jne .next

           mov edx, [esi+8]

           cmp eax, [esi+8]

           ja .next

           mov eax, [esi+8]

.next:

           add esi, 20

           loop @B

           and eax, -4096

           mov [MEM_AMOUNT-OS_BASE], eax

           mov [pg_data.mem_amount-OS_BASE], eax

           shr eax, 12

           mov edx, eax

           mov [pg_data.pages_count-OS_BASE], eax

           shr eax, 3

           mov [pg_data.pagemap_size-OS_BASE], eax

           add eax, (sys_pgmap-OS_BASE)+4095

           and eax, not 4095

           mov [tmp_page_tabs], eax

           cmp edx, (OS_BASE/4096)

           jbe @F

           mov edx, (OS_BASE/4096)

           jmp .set

@@:

           cmp edx, (HEAP_MIN_SIZE/4096)

           jae .set

           mov edx, (HEAP_MIN_SIZE/4096)

.set:

           mov [pg_data.kernel_pages-OS_BASE], edx

           shr edx, 10

           mov [pg_data.kernel_tables-OS_BASE], edx

           xor eax, eax

           mov edi, sys_pgdir-OS_BASE

           mov ecx, 4096/4

           cld

           rep stosd

           mov edx, (sys_pgdir-OS_BASE)+ (OS_BASE shr 20)

           bt [cpu_caps-OS_BASE], CAPS_PSE

           jnc .no_PSE

           mov ebx, cr4

           or ebx, CR4_PSE

           mov eax, PG_LARGE+PG_SW

           mov cr4, ebx

           dec [pg_data.kernel_tables-OS_BASE]

           mov [edx], eax

           add eax, 0x00400000

           add edx, 4

           mov eax, 0x400000+PG_SW

           mov ecx, [tmp_page_tabs]

           sub ecx, 0x400000

           shr ecx, 12          ;ecx/=4096

           jmp .map_low

.no_PSE:

           mov eax, PG_SW

           mov ecx, [tmp_page_tabs]

           shr ecx, 12

.map_low:

           mov edi, [tmp_page_tabs]

@@:                                   ;

           stosd

           add eax, 0x1000

           dec ecx

           jnz @B

           mov ecx, [pg_data.kernel_tables-OS_BASE]

           shl ecx, 10

           xor eax, eax

           rep stosd

           mov ecx, [pg_data.kernel_tables-OS_BASE]

           mov eax, [tmp_page_tabs]

           or eax, PG_SW

           mov edi, edx

.map_kernel_tabs:

           stosd

           add eax, 0x1000

           dec ecx

           jnz .map_kernel_tabs

           mov dword [sys_pgdir-OS_BASE+(page_tabs shr 20)], sys_pgdir+PG_SW-OS_BASE

           mov edi, (sys_pgdir-OS_BASE)

           lea esi, [edi+(OS_BASE shr 20)]

           movsd

           movsd

           ret

endp

align 4

proc init_page_map

           mov edi, sys_pgmap-OS_BASE

           mov ecx, [pg_data.pagemap_size-OS_BASE]

           shr ecx, 2

           or eax, -1

           cld

           rep stosd

           mov ecx, [tmp_page_tabs]

           mov edx, [pg_data.pages_count-OS_BASE]

           shr ecx, 12

           add ecx, [pg_data.kernel_tables-OS_BASE]

           sub edx, ecx

           mov [pg_data.pages_free-OS_BASE], edx

           mov edi, sys_pgmap-OS_BASE

           mov ebx, ecx

           shr ecx, 5

           xor eax, eax

           rep stosd

           not eax

           mov ecx, ebx

           and ecx, 31

           shl eax, cl

           mov [edi], eax

           add edi, OS_BASE

           mov [page_start-OS_BASE], edi;

           mov ebx, sys_pgmap

           add ebx, [pg_data.pagemap_size-OS_BASE]

           mov [page_end-OS_BASE], ebx