;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 859 $
struc MEM_BLOCK
{ .next_block dd ?
.prev_block dd ? ;+4
.list_fd dd ? ;+8
.list_bk dd ? ;+12
.base dd ? ;+16
.size dd ? ;+20
.flags dd ? ;+24
.handle dd ? ;+28
}
MEM_LIST_OFFSET equ 8
FREE_BLOCK equ 4
USED_BLOCK equ 8
DONT_FREE_BLOCK equ 10h
virtual at 0
MEM_BLOCK MEM_BLOCK
end virtual
MEM_BLOCK_SIZE equ 8*4
block_next equ MEM_BLOCK.next_block
block_prev equ MEM_BLOCK.prev_block
list_fd equ MEM_BLOCK.list_fd
list_bk equ MEM_BLOCK.list_bk
block_base equ MEM_BLOCK.base
block_size equ MEM_BLOCK.size
block_flags equ MEM_BLOCK.flags
align 4
proc free_kernel_space stdcall uses ebx ecx edx esi edi, base:dword
ret
endp
align 4
proc kernel_alloc stdcall, size:dword
locals
lin_addr dd ?
pages_count dd ?
endl
push ebx
push edi
mov eax, [size]
add eax, 4095
and eax, not 4095;
mov [size], eax
test eax, eax
jz .err
mov ebx, eax
shr ebx, 12
mov [pages_count], ebx
stdcall alloc_kernel_space, eax
test eax, eax
jz .err
mov [lin_addr], eax
mov ecx, [pages_count]
mov edx, eax
mov ebx, ecx
shr ecx, 3
jz .next
and ebx, not 7
push ebx
stdcall _alloc_pages, ebx
pop ecx ; yes ecx!!!
test eax, eax
jz .err
mov edi, eax
mov edx, [lin_addr]
@@:
stdcall map_page,edx,edi,dword PG_SW
add edx, 0x1000
add edi, 0x1000
dec ecx
jnz @B
.next:
mov ecx, [pages_count]
and ecx, 7
jz .end
@@:
push ecx
call _alloc_page
pop ecx
test eax, eax
jz .err
stdcall map_page,edx,eax,dword PG_SW
add edx, 0x1000
dec ecx
jnz @B
.end:
mov eax, [lin_addr]
pop edi
pop ebx
ret
.err:
xor eax, eax
pop edi
pop ebx
ret
endp
align 4
proc kernel_free stdcall, base:dword
ret
endp
restore block_next
restore block_prev
restore block_list
restore block_base
restore block_size
restore block_flags
;;;;;;;;;;;;;; USER ;;;;;;;;;;;;;;;;;
HEAP_TOP equ 0x5FC00000
align 4
proc init_heap
mov ebx,[current_slot]
mov eax, [ebx+APPDATA.heap_top]
test eax, eax
jz @F
sub eax,[ebx+APPDATA.heap_base]
sub eax, 4096
ret
@@:
mov esi, [ebx+APPDATA.mem_size]
add esi, 4095
and esi, not 4095
mov [ebx+APPDATA.mem_size], esi
mov eax, HEAP_TOP
mov [ebx+APPDATA.heap_base], esi
mov [ebx+APPDATA.heap_top], eax
sub eax, esi
shr esi, 10
mov ecx, eax
sub eax, 4096
or ecx, FREE_BLOCK
mov [page_tabs+esi], ecx
ret
endp
align 4
proc user_alloc stdcall, alloc_size:dword
push ebx
push esi
push edi
mov ecx, [alloc_size]
add ecx, (4095+4096)
and ecx, not 4095
mov ebx, [current_slot]
mov esi, dword [ebx+APPDATA.heap_base] ; heap_base
mov edi, dword [ebx+APPDATA.heap_top] ; heap_top
l_0:
cmp esi, edi
jae m_exit
mov ebx, esi
shr ebx, 12
mov eax, [page_tabs+ebx*4]
test al, FREE_BLOCK
jz test_used
and eax, 0xFFFFF000
cmp eax, ecx ;alloc_size
jb m_next
jz @f
lea edx, [esi+ecx]
sub eax, ecx
or al, FREE_BLOCK
shr edx, 12
mov [page_tabs+edx*4], eax
@@:
or ecx, USED_BLOCK
mov [page_tabs+ebx*4], ecx
shr ecx, 12
inc ebx
dec ecx
jz .no
@@:
mov dword [page_tabs+ebx*4], 2
inc ebx
dec ecx
jnz @B
.no:
mov edx, [current_slot]
mov ebx, [alloc_size]
add ebx, 0xFFF
and ebx, not 0xFFF
add ebx, [edx+APPDATA.mem_size]
call update_mem_size
lea eax, [esi+4096]
pop edi
pop esi
pop ebx
ret
test_used:
test al, USED_BLOCK
jz m_exit
and eax, 0xFFFFF000
m_next:
add esi, eax
jmp l_0
m_exit:
xor eax, eax
pop edi
pop esi
pop ebx
ret
endp
align 4
proc user_free stdcall, base:dword
push esi
mov esi, [base]
test esi, esi
jz .exit
push ebx
xor ebx, ebx
shr esi, 12
mov eax, [page_tabs+(esi-1)*4]
test al, USED_BLOCK
jz .cantfree
test al, DONT_FREE_BLOCK
jnz .cantfree
and eax, not 4095
mov ecx, eax
or al, FREE_BLOCK
mov [page_tabs+(esi-1)*4], eax
sub ecx, 4096
mov ebx, ecx
shr ecx, 12
jz .released
.release:
xor eax, eax
xchg eax, [page_tabs+esi*4]
test al, 1
jz @F
call free_page
mov eax, esi
shl eax, 12
invlpg [eax]
@@:
inc esi
dec ecx
jnz .release
.released:
push edi
mov edx, [current_slot]
mov esi, dword [edx+APPDATA.heap_base]
mov edi, dword [edx+APPDATA.heap_top]
sub ebx, [edx+APPDATA.mem_size]
neg ebx
call update_mem_size
call user_normalize
pop edi
pop ebx
pop esi
ret
.exit:
xor eax, eax
inc eax
pop esi
ret
.cantfree:
xor eax, eax
pop ebx
pop esi
ret
endp
user_normalize:
; in: esi=heap_base, edi=heap_top
; out: eax=0 <=> OK
; destroys: ebx,edx,esi,edi
shr esi, 12
shr edi, 12
@@:
mov eax, [page_tabs+esi*4]
test al, USED_BLOCK
jz .test_free
shr eax, 12
add esi, eax
jmp @B
.test_free:
test al, FREE_BLOCK
jz .err
mov edx, eax
shr edx, 12
add edx, esi
cmp edx, edi
jae .exit
mov ebx, [page_tabs+edx*4]
test bl, USED_BLOCK
jz .next_free
shr ebx, 12
add edx, ebx
mov esi, edx
jmp @B
.next_free:
test bl, FREE_BLOCK
jz .err
and dword [page_tabs+edx*4], 0
add eax, ebx
and eax, not 4095
or eax, FREE_BLOCK
mov [page_tabs+esi*4], eax
jmp @B
.exit:
xor eax, eax
inc eax
ret
.err:
xor eax, eax
ret
user_realloc:
; in: eax = pointer, ebx = new size
; out: eax = new pointer or NULL
test eax, eax
jnz @f
; realloc(NULL,sz) - same as malloc(sz)
push ebx
call user_alloc
ret
@@:
push ecx edx
lea ecx, [eax - 0x1000]
shr ecx, 12
mov edx, [page_tabs+ecx*4]
test dl, USED_BLOCK
jnz @f
; attempt to realloc invalid pointer
.ret0:
pop edx ecx
xor eax, eax
ret
@@:
test dl, DONT_FREE_BLOCK
jnz .ret0
add ebx, 0x1FFF
shr edx, 12
shr ebx, 12
; edx = allocated size, ebx = new size
add edx, ecx
add ebx, ecx
cmp edx, ebx
jb .realloc_add
; release part of allocated memory
.loop:
cmp edx, ebx
jz .release_done
dec edx
xor eax, eax
xchg eax, [page_tabs+edx*4]
test al, 1
jz .loop
call free_page
mov eax, edx
shl eax, 12
invlpg [eax]
jmp .loop
.release_done:
sub ebx, ecx
cmp ebx, 1
jnz .nofreeall
mov eax, [page_tabs+ecx*4]
and eax, not 0xFFF
mov edx, [current_slot]
mov ebx, [APPDATA.mem_size+edx]
sub ebx, eax
add ebx, 0x1000
or al, FREE_BLOCK
mov [page_tabs+ecx*4], eax
push esi edi
mov esi, [APPDATA.heap_base+edx]
mov edi, [APPDATA.heap_top+edx]
call update_mem_size
call user_normalize
pop edi esi
jmp .ret0 ; all freed
.nofreeall:
sub edx, ecx
shl ebx, 12
or ebx, USED_BLOCK
xchg [page_tabs+ecx*4], ebx
shr ebx, 12
sub ebx, edx
push ebx ecx edx
mov edx, [current_slot]
shl ebx, 12
sub ebx, [APPDATA.mem_size+edx]
neg ebx
call update_mem_size
pop edx ecx ebx
lea eax, [ecx+1]
shl eax, 12
push eax
add ecx, edx
lea edx, [ecx+ebx]
shl ebx, 12
jz .ret
push esi
mov esi, [current_slot]
mov esi, [APPDATA.heap_top+esi]
shr esi, 12
@@:
cmp edx, esi
jae .merge_done
mov eax, [page_tabs+edx*4]
test al, USED_BLOCK
jnz .merge_done
and dword [page_tabs+edx*4], 0
shr eax, 12
add edx, eax
shl eax, 12
add ebx, eax
jmp @b
.merge_done:
pop esi
or ebx, FREE_BLOCK
mov [page_tabs+ecx*4], ebx
.ret:
pop eax edx ecx
ret
.realloc_add:
; get some additional memory
mov eax, [current_slot]
mov eax, [APPDATA.heap_top+eax]
shr eax, 12
cmp edx, eax
jae .cant_inplace
mov eax, [page_tabs+edx*4]
test al, FREE_BLOCK
jz .cant_inplace
shr eax, 12
add eax, edx
sub eax, ebx
jb .cant_inplace
jz @f
shl eax, 12
or al, FREE_BLOCK
mov [page_tabs+ebx*4], eax
@@:
mov eax, ebx
sub eax, ecx
shl eax, 12
or al, USED_BLOCK
mov [page_tabs+ecx*4], eax
lea eax, [ecx+1]
shl eax, 12
push eax
push edi
lea edi, [page_tabs+edx*4]
mov eax, 2
sub ebx, edx
mov ecx, ebx
cld
rep stosd
pop edi
mov edx, [current_slot]
shl ebx, 12
add ebx, [APPDATA.mem_size+edx]
call update_mem_size
pop eax edx ecx
ret
.cant_inplace:
push esi edi
mov eax, [current_slot]
mov esi, [APPDATA.heap_base+eax]
mov edi, [APPDATA.heap_top+eax]
shr esi, 12
shr edi, 12
sub ebx, ecx
.find_place:
cmp esi, edi
jae .place_not_found
mov eax, [page_tabs+esi*4]
test al, FREE_BLOCK
jz .next_place
shr eax, 12
cmp eax, ebx
jae .place_found
add esi, eax
jmp .find_place
.next_place:
shr eax, 12
add esi, eax
jmp .find_place
.place_not_found:
pop edi esi
jmp .ret0
.place_found:
sub eax, ebx
jz @f
push esi
add esi, ebx
shl eax, 12
or al, FREE_BLOCK
mov [page_tabs+esi*4], eax
pop esi
@@:
mov eax, ebx
shl eax, 12
or al, USED_BLOCK
mov [page_tabs+esi*4], eax
inc esi
mov eax, esi
shl eax, 12
push eax
mov eax, [page_tabs+ecx*4]
and eax, not 0xFFF
or al, FREE_BLOCK
sub edx, ecx
mov [page_tabs+ecx*4], eax
inc ecx
dec ebx
dec edx
jz .no
@@:
xor eax, eax
xchg eax, [page_tabs+ecx*4]
mov [page_tabs+esi*4], eax
mov eax, ecx
shl eax, 12
invlpg [eax]
inc esi
inc ecx
dec ebx
dec edx
jnz @b
.no:
push ebx
mov edx, [current_slot]
shl ebx, 12
add ebx, [APPDATA.mem_size+edx]
call update_mem_size
pop ebx
@@:
mov dword [page_tabs+esi*4], 2
inc esi
dec ebx
jnz @b
pop eax edi esi edx ecx
ret
if 0
align 4
proc alloc_dll
pushf
cli
bsf eax, [dll_map]
jnz .find
popf
xor eax, eax
ret
.find:
btr [dll_map], eax
popf
shl eax, 5
add eax, dll_tab
ret
endp
align 4
proc alloc_service
pushf
cli
bsf eax, [srv_map]
jnz .find
popf
xor eax, eax
ret
.find:
btr [srv_map], eax
popf
shl eax,0x02
lea eax,[srv_tab+eax+eax*8] ;srv_tab+eax*36
ret
endp
end if