;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 4424 $
struct MEM_BLOCK
list LHEAD
next_block dd ? ;+8
prev_block dd ? ;+4
base dd ? ;+16
size dd ? ;+20
flags dd ? ;+24
handle dd ? ;+28
ends
FREE_BLOCK equ 4
USED_BLOCK equ 8
DONT_FREE_BLOCK equ 10h
block_next equ MEM_BLOCK.next_block
block_prev equ MEM_BLOCK.prev_block
list_fd equ MEM_BLOCK.list.next
list_bk equ MEM_BLOCK.list.prev
block_base equ MEM_BLOCK.base
block_size equ MEM_BLOCK.size
block_flags equ MEM_BLOCK.flags
macro calc_index op
{ shr op, 12
dec op
cmp op, 63
jna @f
mov op, 63
@@:
}
align 4
md:
.add_to_used:
mov eax, [esi+block_base]
mov ebx, [esi+block_base]
shr ebx, 6
add eax, ebx
shr ebx, 6
add eax, ebx
shr eax, 12
and eax, 63
inc [mem_hash_cnt+eax*4]
lea ecx, [mem_used_list+eax*8]
list_add esi, ecx
mov [esi+block_flags], USED_BLOCK
mov eax, [esi+block_size]
sub [heap_free], eax
ret
align 4
.find_used:
mov ecx, eax
mov ebx, eax
shr ebx, 6
add ecx, ebx
shr ebx, 6
add ecx, ebx
shr ecx, 12
and ecx, 63
lea ebx, [mem_used_list+ecx*8]
mov esi, ebx
.next:
mov esi, [esi+list_fd]
cmp esi, ebx
je .fail
cmp eax, [esi+block_base]
jne .next
ret
.fail:
xor esi, esi
ret
align 4
.del_from_used:
call .find_used
test esi, esi
jz .done
cmp [esi+block_flags], USED_BLOCK
jne .fatal
dec [mem_hash_cnt+ecx*4]
list_del esi
.done:
ret
.fatal: ;FIXME panic here
xor esi, esi
ret
;Initial heap state
;
;+heap_size terminator USED_BLOCK
;+4096*MEM_BLOCK.sizeof free space FREE_BLOCK
;HEAP_BASE heap_descriptors USED_BLOCK
;
align 4
proc init_kernel_heap
mov ecx, 64
mov edi, mem_block_list
@@:
mov eax, edi
stosd
stosd
loop @B
mov ecx, 64
mov edi, mem_used_list
@@:
mov eax, edi
stosd
stosd
loop @B
stdcall alloc_pages, dword 32
or eax, PG_SW
mov ebx, HEAP_BASE
mov ecx, 32
call commit_pages
mov edi, HEAP_BASE ;descriptors
mov ebx, HEAP_BASE+sizeof.MEM_BLOCK ;free space
mov ecx, HEAP_BASE+sizeof.MEM_BLOCK*2 ;terminator
xor eax, eax
mov [edi+block_next], ebx
mov [edi+block_prev], eax
mov [edi+list_fd], eax
mov [edi+list_bk], eax
mov [edi+block_base], HEAP_BASE
mov [edi+block_size], 4096*sizeof.MEM_BLOCK
mov [edi+block_flags], USED_BLOCK
mov [ecx+block_next], eax
mov [ecx+block_prev], ebx
mov [ecx+list_fd], eax
mov [ecx+list_bk], eax
mov [ecx+block_base], eax
mov [ecx+block_size], eax
mov [ecx+block_flags], USED_BLOCK
mov [ebx+block_next], ecx
mov [ebx+block_prev], edi
mov [ebx+block_base], HEAP_BASE+4096*sizeof.MEM_BLOCK
mov ecx, [pg_data.kernel_pages]
shl ecx, 12
sub ecx, HEAP_BASE-OS_BASE+4096*sizeof.MEM_BLOCK
mov [heap_size], ecx
mov [heap_free], ecx
mov [ebx+block_size], ecx
mov [ebx+block_flags], FREE_BLOCK
mov [mem_block_mask], eax
mov [mem_block_mask+4], 0x80000000
mov ecx, mem_block_list+63*8
list_add ebx, ecx
mov ecx, 4096-3-1
mov eax, HEAP_BASE+sizeof.MEM_BLOCK*4
mov [next_memblock], HEAP_BASE+sizeof.MEM_BLOCK *3
@@:
mov [eax-sizeof.MEM_BLOCK], eax
add eax, sizeof.MEM_BLOCK
loop @B
mov [eax-sizeof.MEM_BLOCK], dword 0
mov ecx, heap_mutex
call mutex_init
mov [heap_blocks], 4094
mov [free_blocks], 4093
ret
endp
; param
; eax= required size
;
; retval
; edi= memory block descriptor
; ebx= descriptor index
align 4
get_small_block:
mov ecx, eax
shr ecx, 12
dec ecx
cmp ecx, 63
jle .get_index
mov ecx, 63
.get_index:
lea esi, [mem_block_mask]
xor ebx, ebx
or edx, -1
cmp ecx, 32
jb .bit_test
sub ecx, 32
add ebx, 32
add esi, 4
.bit_test:
shl edx, cl
and edx, [esi]
.find:
bsf edi, edx
jz .high_mask
add ebx, edi
lea ecx, [mem_block_list+ebx*8]
mov edi, ecx
.next:
mov edi, [edi+list_fd]
cmp edi, ecx
je .err
cmp eax, [edi+block_size]
ja .next
ret
.err:
xor edi, edi
ret
.high_mask:
add esi, 4
cmp esi, mem_block_mask+8
jae .err
add ebx, 32
mov edx, [esi]
jmp .find
align 4
free_mem_block:
mov ebx, [next_memblock]
mov [eax], ebx
mov [next_memblock], eax
xor ebx, ebx
mov dword [eax+4], ebx
mov dword [eax+8], ebx
mov dword [eax+12], ebx
mov dword [eax+16], ebx
; mov dword [eax+20], 0 ;don't clear block size
mov dword [eax+24], ebx
mov dword [eax+28], ebx
inc [free_blocks]
ret
align 4
proc alloc_kernel_space stdcall, size:dword
local block_ind:DWORD
push ebx
push esi
push edi
mov eax, [size]
add eax, 4095
and eax, not 4095
mov [size], eax
cmp eax, [heap_free]
ja .error
spin_lock_irqsave heap_mutex
mov eax, [size]
call get_small_block ; eax
test edi, edi
jz .error_unlock
cmp [edi+block_flags], FREE_BLOCK
jne .error_unlock
mov [block_ind], ebx ;index of allocated block
mov eax, [edi+block_size]
cmp eax, [size]
je .m_eq_size
mov esi, [next_memblock] ;new memory block
test esi, esi
jz .error_unlock
dec [free_blocks]
mov eax, [esi]
mov [next_memblock], eax
mov [esi+block_next], edi
mov eax, [edi+block_prev]
mov [esi+block_prev], eax
mov [edi+block_prev], esi
mov [esi+list_fd], 0
mov [esi+list_bk], 0
mov [eax+block_next], esi
mov ebx, [edi+block_base]
mov [esi+block_base], ebx
mov edx, [size]
mov [esi+block_size], edx
add [edi+block_base], edx
sub [edi+block_size], edx
mov eax, [edi+block_size]
calc_index eax
cmp eax, [block_ind]
je .add_used
list_del edi
mov ecx, [block_ind]
lea edx, [mem_block_list+ecx*8]
cmp edx, [edx]
jnz @f
btr [mem_block_mask], ecx
@@:
bts [mem_block_mask], eax
lea edx, [mem_block_list+eax*8] ;edx= list head
list_add edi, edx
.add_used:
call md.add_to_used
spin_unlock_irqrestore heap_mutex
mov eax, [esi+block_base]
pop edi
pop esi
pop ebx
ret
.m_eq_size:
list_del edi
lea edx, [mem_block_list+ebx*8]
cmp edx, [edx]
jnz @f
btr [mem_block_mask], ebx
@@:
mov esi, edi
jmp .add_used
.error_unlock:
spin_unlock_irqrestore heap_mutex
.error:
xor eax, eax
pop edi
pop esi
pop ebx
ret
endp
align 4
proc free_kernel_space stdcall uses ebx ecx edx esi edi, base:dword
spin_lock_irqsave heap_mutex
mov eax, [base]
call md.del_from_used
test esi, esi
jz .fail
mov eax, [esi+block_size]
add [heap_free], eax
mov edi, [esi+block_next]
cmp [edi+block_flags], FREE_BLOCK
jne .prev
list_del edi
mov edx, [edi+block_next]
mov [esi+block_next], edx
mov [edx+block_prev], esi
mov ecx, [edi+block_size]
add [esi+block_size], ecx
calc_index ecx
lea edx, [mem_block_list+ecx*8]
cmp edx, [edx]
jne @F
btr [mem_block_mask], ecx
@@:
mov eax, edi
call free_mem_block
.prev:
mov edi, [esi+block_prev]
cmp [edi+block_flags], FREE_BLOCK
jne .insert
mov edx, [esi+block_next]
mov [edi+block_next], edx
mov [edx+block_prev], edi
mov eax, esi
call free_mem_block
mov ecx, [edi+block_size]
mov eax, [esi+block_size]
add eax, ecx
mov [edi+block_size], eax
calc_index eax ;new index
calc_index ecx ;old index
cmp eax, ecx
je .m_eq
push ecx
list_del edi
pop ecx
lea edx, [mem_block_list+ecx*8]
cmp edx, [edx]
jne .add_block
btr [mem_block_mask], ecx
.add_block:
bts [mem_block_mask], eax
lea edx, [mem_block_list+eax*8]
list_add edi, edx
.m_eq:
spin_unlock_irqrestore heap_mutex
xor eax, eax
not eax
ret
.insert:
mov [esi+block_flags], FREE_BLOCK
mov eax, [esi+block_size]
calc_index eax
mov edi, esi
jmp .add_block
.fail:
spin_unlock_irqrestore heap_mutex
xor eax, eax
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
and eax, eax
jz .err
mov ebx, eax
shr ebx, 12
mov [pages_count], ebx
stdcall alloc_kernel_space, eax
mov [lin_addr], eax
mov ebx, [pages_count]
test eax, eax
jz .err
mov edx, eax
shr ebx, 3
jz .tail
shl ebx, 3
stdcall alloc_pages, ebx
test eax, eax
jz .err
mov ecx, ebx
or eax, PG_SW
mov ebx, [lin_addr]
call commit_pages
mov edx, ebx ; this dirty hack
.tail:
mov ebx, [pages_count]
and ebx, 7
jz .end
@@:
call alloc_page
test eax, eax
jz .err
stdcall map_page, edx, eax, dword PG_SW
add edx, 0x1000
dec ebx
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
push ebx esi
spin_lock_irqsave heap_mutex
mov eax, [base]
call md.find_used
cmp [esi+block_flags], USED_BLOCK
jne .fail
spin_unlock_irqrestore heap_mutex
mov eax, [esi+block_base]
mov ecx, [esi+block_size]
shr ecx, 12
call release_pages ;eax, ecx
stdcall free_kernel_space, [base]
pop esi ebx
ret
.fail:
spin_unlock_irqrestore heap_mutex
xor eax, eax
pop esi ebx
ret
endp
restore block_next
restore block_prev
restore block_list
restore block_base
restore block_size
restore block_flags
;;;;;;;;;;;;;; USER ;;;;;;;;;;;;;;;;;
HEAP_TOP equ 0x80000000
align 4
proc init_heap
mov ebx, [current_slot]
mov ebx, [ebx+APPDATA.process]
mov eax, [ebx+PROC.heap_top]
test eax, eax
jz @F
sub eax, [ebx+PROC.heap_base]
sub eax, PAGE_SIZE
ret
@@:
mov esi, [ebx+PROC.mem_used]
add esi, 4095
and esi, not 4095
mov [ebx+PROC.mem_used], esi
mov eax, HEAP_TOP
mov [ebx+PROC.heap_base], esi
mov [ebx+PROC.heap_top], eax
sub eax, esi
shr esi, 10
mov ecx, eax
sub eax, PAGE_SIZE
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+PAGE_SIZE)
and ecx, not 4095
mov ebx, [current_slot]
mov ebx, [ebx+APPDATA.process]
mov esi, dword [ebx+PROC.heap_base] ; heap_base
mov edi, dword [ebx+PROC.heap_top] ; heap_top
.scan:
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 edx, [edx+APPDATA.process]
mov ebx, [alloc_size]
add ebx, 0xFFF
and ebx, not 0xFFF
add [edx+PROC.mem_used], ebx
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 .scan
.m_exit:
xor eax, eax
pop edi
pop esi
pop ebx
ret
endp
align 4
proc user_alloc_at stdcall, address:dword, alloc_size:dword
push ebx
push esi
push edi
mov ebx, [current_slot]
mov ebx, [ebx+APPDATA.process]
mov edx, [address]
and edx, not 0xFFF
mov [address], edx
sub edx, 0x1000
jb .error
mov esi, [ebx+PROC.heap_base]
mov edi, [ebx+PROC.heap_top]
cmp edx, esi
jb .error
.scan:
cmp esi, edi
jae .error
mov ebx, esi
shr ebx, 12
mov eax, [page_tabs+ebx*4]
mov ecx, eax
and ecx, 0xFFFFF000
add ecx, esi
cmp edx, ecx
jb .found
mov esi, ecx
jmp .scan
.error:
xor eax, eax
pop edi
pop esi
pop ebx
ret
.found:
test al, FREE_BLOCK
jz .error
mov eax, ecx
sub eax, edx
sub eax, 0x1000
cmp eax, [alloc_size]
jb .error
; Here we have 1 big free block which includes requested area.
; In general, 3 other blocks must be created instead:
; free at [esi, edx);
; busy at [edx, edx+0x1000+ALIGN_UP(alloc_size,0x1000));
; free at [edx+0x1000+ALIGN_UP(alloc_size,0x1000), ecx)
; First or third block (or both) may be absent.
mov eax, edx
sub eax, esi
jz .nofirst
or al, FREE_BLOCK
mov [page_tabs+ebx*4], eax
.nofirst:
mov eax, [alloc_size]
add eax, 0x1FFF
and eax, not 0xFFF
mov ebx, edx
add edx, eax
shr ebx, 12
or al, USED_BLOCK
mov [page_tabs+ebx*4], eax
shr eax, 12
dec eax
jz .second_nofill
inc ebx
.fill:
mov dword [page_tabs+ebx*4], 2
inc ebx
dec eax
jnz .fill
.second_nofill:
sub ecx, edx
jz .nothird
or cl, FREE_BLOCK
mov [page_tabs+ebx*4], ecx
.nothird:
mov edx, [current_slot]
mov edx, [edx+APPDATA.process]
mov ebx, [alloc_size]
add ebx, 0xFFF
and ebx, not 0xFFF
add [edx+PROC.mem_used], ebx
mov eax, [address]
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
test eax, PG_SHARED
jnz @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 edx, [edx+APPDATA.process]
mov esi, dword [edx+PROC.heap_base]
mov edi, dword [edx+PROC.heap_top]
sub ebx, [edx+PROC.mem_used]
neg ebx
mov [edx+PROC.mem_used], ebx
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
align 4
proc user_unmap stdcall, base:dword, offset:dword, size:dword
push ebx
mov ebx, [base] ; must be valid pointer
test ebx, ebx
jz .error
mov edx, [offset] ; check offset
add edx, ebx ; must be below 2Gb app limit
js .error
shr ebx, 12 ; chek block attributes
lea ebx, [page_tabs+ebx*4]
mov eax, [ebx-4] ; block attributes
test al, USED_BLOCK
jz .error
test al, DONT_FREE_BLOCK
jnz .error
shr edx, 12
lea edx, [page_tabs+edx*4] ; unmap offset
mov ecx, [size]
add ecx, 4095
shr ecx, 12 ; unmap size in pages
shr eax, 12 ; block size + 1 page
lea ebx, [ebx+eax*4-4] ; block end ptr
lea eax, [edx+ecx*4] ; unmap end ptr
cmp eax, ebx ; check for overflow
ja .error
mov ebx, [offset]
and ebx, not 4095 ; is it required ?
add ebx, [base]
.unmap:
mov eax, [edx] ; get page addres
test al, 1 ; page mapped ?
jz @F
test eax, PG_SHARED ; page shared ?
jnz @F
mov [edx], dword 2
; mark page as reserved
invlpg [ebx] ; when we start using
call free_page ; empty c-o-w page instead this ?
@@:
add ebx, 4096
add edx, 4
dec ecx
jnz .unmap
pop ebx
or al, 1 ; return non zero on success
ret
.error:
pop ebx
xor eax, eax ; something wrong
ret
endp
align 4
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 edx, [edx+APPDATA.process]
mov ebx, [edx+PROC.mem_used]
sub ebx, eax
add ebx, 0x1000
or al, FREE_BLOCK
mov [page_tabs+ecx*4], eax
push esi edi
mov esi, [edx+PROC.heap_base]
mov edi, [edx+PROC.heap_top]
mov [edx+PROC.mem_used], ebx
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]
mov edx, [edx+APPDATA.process]
shl ebx, 12
sub ebx, [edx+PROC.mem_used]
neg ebx
mov [edx+PROC.mem_used], ebx
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, [esi+APPDATA.process]
mov esi, [esi+PROC.heap_top]
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, [eax+APPDATA.process]
mov eax, [eax+PROC.heap_top]
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]
mov edx, [edx+APPDATA.process]
shl ebx, 12
add [edx+PROC.mem_used], ebx
pop eax edx ecx
ret
.cant_inplace:
push esi edi
mov eax, [current_slot]
mov eax, [eax+APPDATA.process]
mov esi, [eax+PROC.heap_base]
mov edi, [eax+PROC.heap_top]
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]
mov edx, [eax+APPDATA.process]
shl ebx, 12
add [edx+PROC.mem_used], ebx
pop ebx
@@:
mov dword [page_tabs+esi*4], 2
inc esi
dec ebx
jnz @b
pop eax edi esi edx ecx
ret
;;;;;;;;;;;;;; SHARED MEMORY ;;;;;;;;;;;;;;;;;
; param
; eax= shm_map object
align 4
destroy_smap:
pushfd
cli
push esi
push edi
mov edi, eax
mov esi, [eax+SMAP.parent]
test esi, esi
jz .done
lock dec [esi+SMEM.refcount]
jnz .done
mov ecx, [esi+SMEM.bk]
mov edx, [esi+SMEM.fd]
mov [ecx+SMEM.fd], edx
mov [edx+SMEM.bk], ecx
stdcall kernel_free, [esi+SMEM.base]
mov eax, esi
call free
.done:
mov eax, edi
call destroy_kernel_object
pop edi
pop esi
popfd
ret
E_NOTFOUND equ 5
E_ACCESS equ 10
E_NOMEM equ 30
E_PARAM equ 33
SHM_READ equ 0
SHM_WRITE equ 1
SHM_ACCESS_MASK equ 3
SHM_OPEN equ (0 shl 2)
SHM_OPEN_ALWAYS equ (1 shl 2)
SHM_CREATE equ (2 shl 2)
SHM_OPEN_MASK equ (3 shl 2)
align 4
proc shmem_open stdcall name:dword, size:dword, access:dword
locals
action dd ?
owner_access dd ?
mapped dd ?
endl
push ebx
push esi
push edi
mov [mapped], 0
mov [owner_access], 0
pushfd ;mutex required
cli
mov eax, [access]
and eax, SHM_OPEN_MASK
mov [action], eax
mov ebx, [name]
test ebx, ebx
mov edx, E_PARAM
jz .fail
mov esi, [shmem_list.fd]
align 4
@@:
cmp esi, shmem_list
je .not_found
lea edx, [esi+SMEM.name]; link , base, size
stdcall strncmp, edx, ebx, 32
test eax, eax
je .found
mov esi, [esi+SMEM.fd]
jmp @B
.not_found:
mov eax, [action]
cmp eax, SHM_OPEN
mov edx, E_NOTFOUND
je .fail
cmp eax, SHM_CREATE
mov edx, E_PARAM
je .create_shm
cmp eax, SHM_OPEN_ALWAYS
jne .fail
.create_shm:
mov ecx, [size]
test ecx, ecx
jz .fail
add ecx, 4095
and ecx, -4096
mov [size], ecx
mov eax, sizeof.SMEM
call malloc
test eax, eax
mov esi, eax
mov edx, E_NOMEM
jz .fail
stdcall kernel_alloc, [size]
test eax, eax
mov [mapped], eax
mov edx, E_NOMEM
jz .cleanup
mov ecx, [size]
mov edx, [access]
and edx, SHM_ACCESS_MASK
mov [esi+SMEM.base], eax
mov [esi+SMEM.size], ecx
mov [esi+SMEM.access], edx
mov [esi+SMEM.refcount], 0
mov [esi+SMEM.name+28], 0
lea eax, [esi+SMEM.name]
stdcall strncpy, eax, [name], 31
mov eax, [shmem_list.fd]
mov [esi+SMEM.bk], shmem_list
mov [esi+SMEM.fd], eax
mov [eax+SMEM.bk], esi
mov [shmem_list.fd], esi
mov [action], SHM_OPEN
mov [owner_access], SHM_WRITE
.found:
mov eax, [action]
cmp eax, SHM_CREATE
mov edx, E_ACCESS
je .exit
cmp eax, SHM_OPEN
mov edx, E_PARAM
je .create_map
cmp eax, SHM_OPEN_ALWAYS
jne .fail
.create_map:
mov eax, [access]
and eax, SHM_ACCESS_MASK
cmp eax, [esi+SMEM.access]
mov [access], eax
mov edx, E_ACCESS
ja .fail
mov ebx, [CURRENT_TASK]
shl ebx, 5
mov ebx, [CURRENT_TASK+ebx+4]
mov eax, sizeof.SMAP
call create_kernel_object
test eax, eax
mov edi, eax
mov edx, E_NOMEM
jz .fail
inc [esi+SMEM.refcount]
mov [edi+SMAP.magic], 'SMAP'
mov [edi+SMAP.destroy], destroy_smap
mov [edi+SMAP.parent], esi
mov [edi+SMAP.base], 0
stdcall user_alloc, [esi+SMEM.size]
test eax, eax
mov [mapped], eax
mov edx, E_NOMEM
jz .cleanup2
mov [edi+SMAP.base], eax
mov ecx, [esi+SMEM.size]
mov [size], ecx
shr ecx, 12
shr eax, 10
mov esi, [esi+SMEM.base]
shr esi, 10
lea edi, [page_tabs+eax]
add esi, page_tabs
mov edx, [access]
or edx, [owner_access]
shl edx, 1
or edx, PG_USER+PG_SHARED
@@:
lodsd
and eax, 0xFFFFF000
or eax, edx
stosd
loop @B
xor edx, edx
cmp [owner_access], 0
jne .fail
.exit:
mov edx, [size]
.fail:
mov eax, [mapped]
popfd
pop edi
pop esi
pop ebx
ret
.cleanup:
mov [size], edx
mov eax, esi
call free
jmp .exit
.cleanup2:
mov [size], edx
mov eax, edi
call destroy_smap
jmp .exit
endp
align 4
proc shmem_close stdcall, name:dword
mov eax, [name]
test eax, eax
jz .fail
push esi
push edi
pushfd
cli
mov esi, [current_slot]
add esi, APP_OBJ_OFFSET
.next:
mov eax, [esi+APPOBJ.fd]
test eax, eax
jz @F
cmp eax, esi
mov esi, eax
je @F
cmp [eax+SMAP.magic], 'SMAP'
jne .next
mov edi, [eax+SMAP.parent]
test edi, edi
jz .next
lea edi, [edi+SMEM.name]
stdcall strncmp, [name], edi, 32
test eax, eax
jne .next
stdcall user_free, [esi+SMAP.base]
mov eax, esi
call [esi+APPOBJ.destroy]
@@:
popfd
pop edi
pop esi
.fail:
ret
endp