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
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
macro calc_index op
{ shr op, 12
dec op
cmp op, 63
jna @f
mov op, 63
@@:
}
macro remove_from_list op
{ mov edx, [op+list_fd]
mov ecx, [op+list_bk]
test edx, edx
jz @f
mov [edx+list_bk], ecx
@@:
test ecx, ecx
jz @f
mov [ecx+list_fd], edx
@@:
mov [op+list_fd],0
mov [op+list_bk],0
}
macro remove_from_free op
{
remove_from_list op
mov eax, [op+block_size]
calc_index eax
cmp [mem_block_list+eax*4], op
jne @f
mov [mem_block_list+eax*4], edx
@@:
cmp [mem_block_list+eax*4], 0
jne @f
btr [mem_block_mask], eax
@@:
}
macro remove_from_used op
{
mov edx, [op+list_fd]
mov ecx, [op+list_bk]
mov [edx+list_bk], ecx
mov [ecx+list_fd], edx
mov [op+list_fd], 0
mov [op+list_bk], 0
}
align 4
proc init_kernel_heap
mov ecx, 64/4
mov edi, mem_block_list
xor eax, eax
cld
rep stosd
mov ecx, 512/4
mov edi, mem_block_map
not eax
rep stosd
mov [mem_block_start], mem_block_map
mov [mem_block_end], mem_block_map+512
mov [mem_block_arr], HEAP_BASE
mov eax, mem_used.fd-MEM_LIST_OFFSET
mov [mem_used.fd], eax
mov [mem_used.bk], eax
stdcall alloc_pages, dword 32
mov ecx, 32
mov edx, eax
mov edi, HEAP_BASE
.l1:
stdcall map_page,edi,edx,PG_SW
add edi, 0x1000
add edx, 0x1000
dec ecx
jnz .l1
mov edi, HEAP_BASE
mov ebx, HEAP_BASE+MEM_BLOCK_SIZE
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*MEM_BLOCK_SIZE
mov [edi+block_flags], USED_BLOCK
mov [ebx+block_next], eax
mov [ebx+block_prev], eax
mov [ebx+list_fd], eax
mov [ebx+list_bk], eax
mov [ebx+block_base], HEAP_BASE+4096*MEM_BLOCK_SIZE
mov ecx, [MEM_AMOUNT]
sub ecx, HEAP_BASE + 4096*MEM_BLOCK_SIZE
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 [mem_block_list+63*4], ebx
mov byte [mem_block_map], 0xFC
and [heap_mutex], 0
mov [heap_blocks], 4095
mov [free_blocks], 4095
ret
endp
; param
; eax= required size
;
; retval
; edi= memory block descriptor
; ebx= descriptor index
align 4
get_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
mov edi, [mem_block_list+ebx*4]
.check_size:
cmp eax, [edi+block_size]
ja .next
ret
.high_mask:
add esi, 4
cmp esi, mem_block_mask+8
jae .err
add ebx, 32
mov edx, [esi]
jmp .find
.next:
mov edi, [edi+list_fd]
test edi, edi
jnz .check_size
.err:
xor edi, edi
ret
align 4
proc alloc_mem_block
mov ebx, [mem_block_start]
mov ecx, [mem_block_end]
.l1:
bsf eax,[ebx];
jnz found
add ebx,4
cmp ebx, ecx
jb .l1
xor eax,eax
ret
found:
btr [ebx], eax
mov [mem_block_start],ebx
sub ebx, mem_block_map
lea eax,[eax+ebx*8]
shl eax, 5
add eax, [mem_block_arr]
dec [free_blocks]
ret
endp
proc free_mem_block
mov dword [eax], 0
mov dword [eax+4], 0
mov dword [eax+8], 0
mov dword [eax+12], 0
mov dword [eax+16], 0
; mov dword [eax+20], 0
mov dword [eax+24], 0
mov dword [eax+28], 0
sub eax, [mem_block_arr]
shr eax, 5
mov ebx, mem_block_map
bts [ebx], eax
inc [free_blocks]
shr eax, 3
and eax, not 3
add eax, ebx
cmp [mem_block_start], eax
ja @f
ret
@@:
mov [mem_block_start], eax
ret
.err:
xor eax, eax
ret
endp
align 4
proc alloc_kernel_space stdcall, size:dword
local block_ind:DWORD
mov eax, [size]
add eax, 4095
and eax, not 4095
mov [size], eax
mov ebx, heap_mutex
call wait_mutex ;ebx
cmp eax, [heap_free]
ja .error
call get_block ; eax
test edi, edi
jz .error
cmp [edi+block_flags], FREE_BLOCK
jne .error
mov [block_ind], ebx ;index of allocated block
mov eax, [edi+block_size]
cmp eax, [size]
je .m_eq_size
call alloc_mem_block
and eax, eax
jz .error
mov esi, eax ;esi - splitted block
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
and eax, eax
jz @f
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]
shr eax, 12
sub eax, 1
cmp eax, 63
jna @f
mov eax, 63
@@:
cmp eax, [block_ind]
je .m_eq_ind
remove_from_list edi
mov ecx, [block_ind]
mov [mem_block_list+ecx*4], edx
test edx, edx
jnz @f
btr [mem_block_mask], ecx
@@:
mov edx, [mem_block_list+eax*4]
mov [edi+list_fd], edx
test edx, edx
jz @f
mov [edx+list_bk], edi
@@:
mov [mem_block_list+eax*4], edi
bts [mem_block_mask], eax
.m_eq_ind:
mov ecx, mem_used.fd-MEM_LIST_OFFSET
mov edx, [ecx+list_fd]
mov [esi+list_fd], edx
mov [esi+list_bk], ecx
mov [ecx+list_fd], esi
mov [edx+list_bk], esi
mov [esi+block_flags], USED_BLOCK
mov eax, [esi+block_base]
mov ebx, [size]
sub [heap_free], ebx
and [heap_mutex], 0
ret
.m_eq_size:
remove_from_list edi
mov [mem_block_list+ebx*4], edx
and edx, edx
jnz @f
btr [mem_block_mask], ebx
@@:
mov ecx, mem_used.fd-MEM_LIST_OFFSET
mov edx, [ecx+list_fd]
mov [edi+list_fd], edx
mov [edi+list_bk], ecx
mov [ecx+list_fd], edi
mov [edx+list_bk], edi
mov [edi+block_flags], USED_BLOCK
mov eax, [edi+block_base]
mov ebx, [size]
sub [heap_free], ebx
and [heap_mutex], 0
ret
.error:
xor eax, eax
mov [heap_mutex], eax
ret
endp
align 4
proc free_kernel_space stdcall uses ebx ecx edx esi edi, base:dword
mov ebx, heap_mutex
call wait_mutex ;ebx
mov eax, [base]
mov esi, [mem_used.fd]
@@:
cmp esi, mem_used.fd-MEM_LIST_OFFSET
je .fail
cmp [esi+block_base], eax
je .found
mov esi, [esi+list_fd]
jmp @b
.found:
cmp [esi+block_flags], USED_BLOCK
jne .fail
mov eax, [esi+block_size]
add [heap_free], eax
mov edi, [esi+block_next]
test edi, edi
jz .prev
cmp [edi+block_flags], FREE_BLOCK
jne .prev
remove_from_free edi
mov edx, [edi+block_next]
mov [esi+block_next], edx
test edx, edx
jz @f
mov [edx+block_prev], esi
@@:
mov ecx, [edi+block_size]
add [esi+block_size], ecx
mov eax, edi
call free_mem_block
.prev:
mov edi, [esi+block_prev]
test edi, edi
jz .insert
cmp [edi+block_flags], FREE_BLOCK
jne .insert
remove_from_used esi
mov edx, [esi+block_next]
mov [edi+block_next], edx
test edx, edx
jz @f
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
calc_index ecx
cmp eax, ecx
je .m_eq
push ecx
remove_from_list edi
pop ecx
cmp [mem_block_list+ecx*4], edi
jne @f
mov [mem_block_list+ecx*4], edx
@@:
cmp [mem_block_list+ecx*4], 0
jne @f
btr [mem_block_mask], ecx
@@:
mov esi, [mem_block_list+eax*4]
mov [mem_block_list+eax*4], edi
mov [edi+list_fd], esi
test esi, esi
jz @f
mov [esi+list_bk], edi
@@:
bts [mem_block_mask], eax
.m_eq:
xor eax, eax
mov [heap_mutex], eax
dec eax
ret
.insert:
remove_from_used esi
mov eax, [esi+block_size]
calc_index eax
mov edi, [mem_block_list+eax*4]
mov [mem_block_list+eax*4], esi
mov [esi+list_fd], edi
test edi, edi
jz @f
mov [edi+list_bk], esi
@@:
bts [mem_block_mask], eax
mov [esi+block_flags],FREE_BLOCK
xor eax, eax
mov [heap_mutex], eax
dec eax
ret
.fail:
xor eax, eax
mov [heap_mutex], eax
ret
endp
align 4
proc kernel_alloc stdcall, size:dword
locals
lin_addr dd ?
pages_count dd ?
endl
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
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!!!
and 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]
ret
.err:
xor eax, eax
ret
endp
align 4
proc kernel_free stdcall, base:dword
push ebx esi
mov ebx, heap_mutex
call wait_mutex ;ebx
mov eax, [base]
mov esi, [mem_used.fd]
@@:
cmp esi, mem_used.fd-MEM_LIST_OFFSET
je .fail
cmp [esi+block_base], eax
je .found
mov esi, [esi+list_fd]
jmp @b
.found:
cmp [esi+block_flags], USED_BLOCK
jne .fail
and [heap_mutex], 0
push ecx
mov ecx, [esi+block_size];
shr ecx, 12
call release_pages ;eax, ecx
pop ecx
stdcall free_kernel_space, [base]
pop esi ebx
ret
.fail:
and [heap_mutex], 0
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 0x5FC00000
align 4
proc init_heap
mov ebx,[CURRENT_TASK]
shl ebx,8
mov eax, [SLOT_BASE+APPDATA.heap_top+ebx]
test eax, eax
jz @F
sub eax,[SLOT_BASE+APPDATA.heap_base+ebx]
sub eax, 4096
ret
@@:
mov esi, [SLOT_BASE+APPDATA.mem_size+ebx]
add esi, 4095
and esi, not 4095
mov [SLOT_BASE+APPDATA.mem_size+ebx], esi
mov eax, HEAP_TOP
mov [SLOT_BASE+APPDATA.heap_base+ebx], esi
mov [SLOT_BASE+APPDATA.heap_top+ebx], eax
sub eax, esi
add esi, new_app_base
shr esi, 10
mov ecx, eax
sub eax, 4096
or ecx, FREE_BLOCK
mov [page_tabs+esi], ecx
ret
.exit:
xor eax, eax
ret
endp
align 4
proc user_alloc stdcall, alloc_size:dword
mov ecx, [alloc_size]
add ecx, (4095+4096)
and ecx, not 4095
mov ebx, [CURRENT_TASK]
shl ebx, 8
mov esi, dword [ebx+SLOT_BASE+APPDATA.heap_base]; heap_base
mov edi, dword [ebx+SLOT_BASE+APPDATA.heap_top]; heap_top
add esi, new_app_base
add edi, new_app_base
l_0:
cmp esi, edi
jae m_exit
mov ebx, esi
shr ebx, 12
mov eax, [page_tabs+ebx*4]
test eax, FREE_BLOCK
jz test_used
and eax, 0xFFFFF000
cmp eax, ecx ;alloc_size
jb m_next
jz @f
mov edx, esi
add edx, ecx
sub eax, ecx;
or eax, FREE_BLOCK
shr edx, 12
mov [page_tabs+edx*4], eax
@@:
or ecx, USED_BLOCK
mov [page_tabs+ebx*4], ecx
shr ecx, 12
dec ecx
inc ebx
@@:
mov dword [page_tabs+ebx*4], 2
inc ebx
dec ecx
jnz @B
mov edx, [CURRENT_TASK]
shl edx, 8
mov ebx, [alloc_size]
add ebx, 0xFFF
and ebx, not 0xFFF
add ebx, [SLOT_BASE+APPDATA.mem_size+edx]
call update_mem_size
mov eax, esi
add eax, 4096
sub eax, new_app_base
ret
m_next:
add esi, eax
jmp l_0
test_used:
test eax, USED_BLOCK
jz m_exit
and eax, 0xFFFFF000
add esi, eax
jmp l_0
m_exit:
xor eax, eax
ret
endp
align 4
proc user_free stdcall, base:dword
mov esi, [base]
test esi, esi
jz .exit
xor ebx, ebx
sub esi, 4096
shr esi, 12
mov eax, [page_tabs+esi*4]
test eax, USED_BLOCK
jz .not_used
and eax, not 4095
mov ecx, eax
or eax, FREE_BLOCK
mov [page_tabs+esi*4], eax
inc esi
sub ecx, 4096
shr ecx, 12
mov ebx, ecx
.release:
xor eax, eax
xchg eax, [page_tabs+esi*4]
test eax, 1
jz @F
call free_page
@@:
inc esi
dec ecx
jnz .release
.not_used:
mov edx, [CURRENT_TASK]
shl edx, 8
mov esi, dword [edx+SLOT_BASE+APPDATA.heap_base]; heap_base
mov edi, dword [edx+SLOT_BASE+APPDATA.heap_top]; heap_top
sub ebx, [edx+SLOT_BASE+APPDATA.mem_size]
neg ebx
call update_mem_size
add esi, new_app_base
add edi, new_app_base
shr esi, 12
shr edi, 12
@@:
mov eax, [page_tabs+esi*4]
test eax, USED_BLOCK
jz .test_free
shr eax, 12
add esi, eax
jmp @B
.test_free:
test eax, 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 ebx, USED_BLOCK
jz .next_free
shr ebx, 12
add edx, ebx
mov esi, edx
jmp @B
.next_free:
test ebx, 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
endp
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