;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2020. All rights reserved. ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; $Revision$ 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 MEM_BLOCK_RESERVED = 0x02 ; Will be allocated on first access (lazy allocation) MEM_BLOCK_FREE = 0x04 MEM_BLOCK_USED = 0x08 MEM_BLOCK_DONT_FREE = 0x10 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 + MEM_BLOCK.base] mov ebx, [esi + MEM_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 + MEM_BLOCK.flags], MEM_BLOCK_USED mov eax, [esi + MEM_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 + MEM_BLOCK.list.next] cmp esi, ebx je .fail cmp eax, [esi + MEM_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 + MEM_BLOCK.flags], MEM_BLOCK_USED 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 MEM_BLOCK_USED ; + 4096*MEM_BLOCK.sizeof free space MEM_BLOCK_FREE ;HEAP_BASE heap_descriptors MEM_BLOCK_USED ; 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_SWR 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 + MEM_BLOCK.next_block], ebx mov [edi + MEM_BLOCK.prev_block], eax mov [edi + MEM_BLOCK.list.next], eax mov [edi + MEM_BLOCK.list.prev], eax mov [edi + MEM_BLOCK.base], HEAP_BASE mov [edi + MEM_BLOCK.size], 4096*sizeof.MEM_BLOCK mov [edi + MEM_BLOCK.flags], MEM_BLOCK_USED mov [ecx + MEM_BLOCK.next_block], eax mov [ecx + MEM_BLOCK.prev_block], ebx mov [ecx + MEM_BLOCK.list.next], eax mov [ecx + MEM_BLOCK.list.prev], eax mov [ecx + MEM_BLOCK.base], eax mov [ecx + MEM_BLOCK.size], eax mov [ecx + MEM_BLOCK.flags], MEM_BLOCK_USED mov [ebx + MEM_BLOCK.next_block], ecx mov [ebx + MEM_BLOCK.prev_block], edi mov [ebx + MEM_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 + MEM_BLOCK.size], ecx mov [ebx + MEM_BLOCK.flags], MEM_BLOCK_FREE 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 dword[eax-sizeof.MEM_BLOCK], 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 + MEM_BLOCK.list.next] cmp edi, ecx je .err cmp eax, [edi + MEM_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 + MEM_BLOCK.flags], MEM_BLOCK_FREE jne .error_unlock mov [block_ind], ebx ;index of allocated block mov eax, [edi + MEM_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 + MEM_BLOCK.next_block], edi mov eax, [edi + MEM_BLOCK.prev_block] mov [esi + MEM_BLOCK.prev_block], eax mov [edi + MEM_BLOCK.prev_block], esi mov [esi + MEM_BLOCK.list.next], 0 mov [esi + MEM_BLOCK.list.prev], 0 mov [eax + MEM_BLOCK.next_block], esi mov ebx, [edi + MEM_BLOCK.base] mov [esi + MEM_BLOCK.base], ebx mov edx, [size] mov [esi + MEM_BLOCK.size], edx add [edi + MEM_BLOCK.base], edx sub [edi + MEM_BLOCK.size], edx mov eax, [edi + MEM_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 + MEM_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 + MEM_BLOCK.size] add [heap_free], eax mov edi, [esi + MEM_BLOCK.next_block] cmp [edi + MEM_BLOCK.flags], MEM_BLOCK_FREE jne .prev list_del edi mov edx, [edi + MEM_BLOCK.next_block] mov [esi + MEM_BLOCK.next_block], edx mov [edx + MEM_BLOCK.prev_block], esi mov ecx, [edi + MEM_BLOCK.size] add [esi + MEM_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 + MEM_BLOCK.prev_block] cmp [edi + MEM_BLOCK.flags], MEM_BLOCK_FREE jne .insert mov edx, [esi + MEM_BLOCK.next_block] mov [edi + MEM_BLOCK.next_block], edx mov [edx + MEM_BLOCK.prev_block], edi mov eax, esi call free_mem_block mov ecx, [edi + MEM_BLOCK.size] mov eax, [esi + MEM_BLOCK.size] add eax, ecx mov [edi + MEM_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 + MEM_BLOCK.flags], MEM_BLOCK_FREE mov eax, [esi + MEM_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_GLOBAL + PG_SWR 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_GLOBAL + PG_SWR) 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 + MEM_BLOCK.flags], MEM_BLOCK_USED jne .fail spin_unlock_irqrestore heap_mutex mov eax, [esi + MEM_BLOCK.base] mov ecx, [esi + MEM_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 ;;;;;;;;;;;;;; USER HEAP ;;;;;;;;;;;;;;;;; HEAP_TOP = 0x80000000 align 4 proc init_heap mov ebx, [current_process] mov eax, [ebx + PROC.heap_top] test eax, eax jz @F sub eax, [ebx + PROC.heap_base] sub eax, PAGE_SIZE ret @@: lea ecx, [ebx + PROC.heap_lock] call mutex_init 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, MEM_BLOCK_FREE mov [page_tabs + esi], ecx ret endp align 4 proc user_alloc stdcall, alloc_size:dword push ebx esi edi mov ebx, [current_process] lea ecx, [ebx + PROC.heap_lock] call mutex_lock mov ecx, [alloc_size] add ecx, (4095 + PAGE_SIZE) and ecx, not 4095 mov esi, [ebx + PROC.heap_base] mov edi, [ebx + PROC.heap_top] .scan: cmp esi, edi jae .m_exit mov ebx, esi shr ebx, 12 mov eax, [page_tabs + ebx*4] test al, MEM_BLOCK_FREE 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, MEM_BLOCK_FREE shr edx, 12 mov [page_tabs + edx*4], eax @@: or ecx, MEM_BLOCK_USED mov [page_tabs + ebx*4], ecx shr ecx, 12 inc ebx dec ecx jz .no @@: mov dword [page_tabs + ebx*4], MEM_BLOCK_RESERVED inc ebx dec ecx jnz @B .no: mov edx, [current_process] mov ebx, [alloc_size] add ebx, 0xFFF and ebx, not 0xFFF add [edx + PROC.mem_used], ebx lea ecx, [edx + PROC.heap_lock] call mutex_unlock lea eax, [esi + 4096] pop edi pop esi pop ebx ret .test_used: test al, MEM_BLOCK_USED jz .m_exit and eax, 0xFFFFF000 ; not PAGESIZE .m_next: add esi, eax jmp .scan .m_exit: mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock 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_process] lea ecx, [ebx + PROC.heap_lock] call mutex_lock 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: mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock xor eax, eax pop edi pop esi pop ebx ret .found: test al, MEM_BLOCK_FREE 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, MEM_BLOCK_FREE 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, MEM_BLOCK_USED mov [page_tabs + ebx*4], eax shr eax, 12 dec eax jz .second_nofill inc ebx .fill: mov dword [page_tabs + ebx*4], MEM_BLOCK_RESERVED inc ebx dec eax jnz .fill .second_nofill: sub ecx, edx jz .nothird or cl, MEM_BLOCK_FREE mov [page_tabs + ebx*4], ecx .nothird: mov edx, [current_process] mov ebx, [alloc_size] add ebx, 0xFFF and ebx, not 0xFFF add [edx + PROC.mem_used], ebx lea ecx, [edx + PROC.heap_lock] call mutex_unlock 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 .fail push ebx mov ebx, [current_process] lea ecx, [ebx + PROC.heap_lock] call mutex_lock xor ebx, ebx shr esi, 12 mov eax, [page_tabs + (esi-1)*4] test al, MEM_BLOCK_USED jz .cantfree test al, MEM_BLOCK_DONT_FREE jnz .cantfree and eax, not 4095 mov ecx, eax or al, MEM_BLOCK_FREE 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_process] lea ecx, [edx + PROC.heap_lock] 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 .exit: call mutex_unlock xor eax, eax inc eax pop ebx pop esi ret .cantfree: mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] jmp .exit .fail: xor eax, eax 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, MEM_BLOCK_USED jz .error test al, MEM_BLOCK_DONT_FREE 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 dword[edx], MEM_BLOCK_RESERVED ; mark page as reserved invlpg [ebx] ; when we start using call free_page ; empty c-o-w page instead this ? @@: add ebx, 4096 ; PAGESIZE? 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, MEM_BLOCK_USED jz .test_free shr eax, 12 add esi, eax jmp @B .test_free: test al, MEM_BLOCK_FREE jz .err mov edx, eax shr edx, 12 add edx, esi cmp edx, edi jae .exit mov ebx, [page_tabs + edx*4] test bl, MEM_BLOCK_USED jz .next_free shr ebx, 12 add edx, ebx mov esi, edx jmp @B .next_free: test bl, MEM_BLOCK_FREE jz .err and dword[page_tabs + edx*4], 0 add eax, ebx and eax, not 4095 ; not (PAGESIZE - 1) ? or eax, MEM_BLOCK_FREE 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 push eax mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_lock pop eax lea ecx, [eax - 0x1000] shr ecx, 12 mov edx, [page_tabs + ecx*4] test dl, MEM_BLOCK_USED jnz @f ; attempt to realloc invalid pointer .ret0: mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock pop edx ecx xor eax, eax ret @@: test dl, MEM_BLOCK_DONT_FREE 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_process] mov ebx, [edx + PROC.mem_used] sub ebx, eax add ebx, 0x1000 or al, MEM_BLOCK_FREE 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, MEM_BLOCK_USED xchg [page_tabs + ecx*4], ebx shr ebx, 12 sub ebx, edx push ebx ecx edx mov edx, [current_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_process] mov esi, [esi + PROC.heap_top] shr esi, 12 @@: cmp edx, esi jae .merge_done mov eax, [page_tabs + edx*4] test al, MEM_BLOCK_USED 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, MEM_BLOCK_FREE mov [page_tabs + ecx*4], ebx .ret: mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock pop eax edx ecx ret .realloc_add: ; get some additional memory mov eax, [current_process] mov eax, [eax + PROC.heap_top] shr eax, 12 cmp edx, eax jae .cant_inplace mov eax, [page_tabs + edx*4] test al, MEM_BLOCK_FREE jz .cant_inplace shr eax, 12 add eax, edx sub eax, ebx jb .cant_inplace jz @f shl eax, 12 or al, MEM_BLOCK_FREE mov [page_tabs + ebx*4], eax @@: mov eax, ebx sub eax, ecx shl eax, 12 or al, MEM_BLOCK_USED 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_process] shl ebx, 12 add [edx + PROC.mem_used], ebx mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock pop eax edx ecx ret .cant_inplace: push esi edi mov eax, [current_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, MEM_BLOCK_FREE 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, MEM_BLOCK_FREE mov [page_tabs + esi*4], eax pop esi @@: mov eax, ebx shl eax, 12 or al, MEM_BLOCK_USED 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, MEM_BLOCK_FREE 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_process] shl ebx, 12 add [edx + PROC.mem_used], ebx pop ebx @@: mov dword [page_tabs + esi*4], MEM_BLOCK_RESERVED inc esi dec ebx jnz @b mov ecx, [current_process] lea ecx, [ecx + PROC.heap_lock] call mutex_unlock 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 = 5 E_ACCESS = 10 E_NOMEM = 30 E_PARAM = 33 SHM_READ = 0 SHM_WRITE = 1 SHM_ACCESS_MASK = 3 SHM_OPEN = 0 shl 2 SHM_OPEN_ALWAYS = 1 shl 2 SHM_CREATE = 2 shl 2 SHM_OPEN_MASK = 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_SHARED + PG_UR @@: 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 proc user_ring stdcall, size:dword locals virt_ptr dd ? phys_ptr dd ? num_pages dd ? endl ; Size must be an exact multiple of pagesize mov eax, [size] test eax, PAGE_SIZE-1 jnz .exit ; We must have at least one complete page shr eax, 12 jz .exit mov [num_pages], eax ; Allocate double the virtual memory mov eax, [size] shl eax, 1 jz .exit stdcall user_alloc, eax test eax, eax jz .exit mov [virt_ptr], eax ; Now allocate physical memory stdcall alloc_pages, [num_pages] test eax, eax jz .exit_free_virt mov [phys_ptr], eax ; Map first half of virtual memory to physical memory push ecx esi edi mov ecx, [num_pages] mov esi, [virt_ptr] mov edi, [phys_ptr] .loop1: stdcall map_page, esi, edi, PG_UWR add esi, PAGE_SIZE add edi, PAGE_SIZE dec ecx jnz .loop1 ; Map second half of virtual memory to same physical memory mov ecx, [num_pages] mov edi, [phys_ptr] .loop2: stdcall map_page, esi, edi, PG_UWR add esi, PAGE_SIZE add edi, PAGE_SIZE dec ecx jnz .loop2 pop edi esi ecx mov eax, [virt_ptr] ret .exit_free_virt: stdcall user_free, [virt_ptr] .exit: xor eax, eax ret endp