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one old and stupid bug fixed

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git-svn-id: svn://kolibrios.org@2350 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Artem Jerdev (art_zh) 2012-02-15 22:56:09 +00:00
parent 84726c7e7b
commit db3a775207
1 changed files with 5 additions and 56 deletions
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61
kernel/branches/Kolibri-A/trunk/init.inc
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@ -78,24 +78,21 @@ proc init_mem
mov [pg_data.mem_amount-OS_BASE], eax ; the true MEMTOP
mov [UserDMAaddr-OS_BASE], eax
mov edx, esi ; edx will hold maximum allocatable address
shr esi, 12
mov [pg_data.pages_count-OS_BASE], esi ; max number of PTEs ?
shr edx, 12
add edx, 31
and edx, not 31
mov edx, esi ; edx will hold maximum allocatable address
shr edx, 3
mov [pg_data.pagemap_size-OS_BASE], edx ; size of sys_pgmap structure
add edx, (sys_pgmap-OS_BASE)+4095
and edx, not 4095
mov [tmp_page_tabs], edx ; free zone to build PTEs
mov [tmp_page_tabs], edx ; free zone to build PTEs for all available memory
mov edx, (HEAP_BASE-OS_BASE+HEAP_MIN_SIZE)/4096
mov [pg_data.kernel_pages -OS_BASE], edx
shr edx, 10
mov [pg_data.kernel_tables-OS_BASE], edx
mov [pg_data.kernel_tables-OS_BASE], edx ; number of Kernel PDEs needed
mov edx, (sys_pgdir-OS_BASE)+ 0x800 ; (0x800 = OS_BASE shr 20)
@ -136,62 +133,14 @@ endp
align 4
proc init_page_map
; mark all memory as unavailable
; mark all memory as available
mov edi, sys_pgmap-OS_BASE
mov ecx, [pg_data.pagemap_size-OS_BASE]
shr ecx, 2
xor eax, eax
mov eax, -1
cld
rep stosd
; scan through memory map and mark free areas as available
mov ebx, BOOT_VAR-OS_BASE + 0x9104
mov edx, [ebx-4]
.scanmap:
mov ecx, [ebx+8]
shr ecx, 12 ; ecx = number of pages
jz .next
mov edi, [ebx]
shr edi, 12 ; edi = first page
mov eax, edi
shr edi, 5
shl edi, 2
add edi, sys_pgmap-OS_BASE
and eax, 31
jz .startok
add ecx, eax
sub ecx, 32
jbe .onedword
push ecx
mov ecx, eax
or eax, -1
shl eax, cl
or [edi], eax
add edi, 4
pop ecx
.startok:
push ecx
shr ecx, 5
or eax, -1
rep stosd
pop ecx
and ecx, 31
neg eax
shl eax, cl
dec eax
or [edi], eax
jmp .next
.onedword:
add ecx, 32
sub ecx, eax
@@:
bts [edi], eax
inc eax
loop @b
.next:
add ebx, 20
dec edx
jnz .scanmap
; mark kernel memory as allocated (unavailable)
mov ecx, [tmp_page_tabs]