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700 lines
18 KiB
700 lines
18 KiB
TITLE GMOREMEM - More Global Memory Manager procedures
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.xlist
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include kernel.inc
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include tdb.inc
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include newexe.inc
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.list
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include protect.inc
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.386p
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DataBegin
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externB Kernel_Flags
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externW pGlobalHeap
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externW curTDB
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externW headTDB
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externW Win_PDB
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externW MaxCodeSwapArea
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DataEnd
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sBegin CODE
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assumes CS,CODE
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assumes DS,NOTHING
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assumes ES,NOTHING
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if SDEBUG
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externNP DebugMovedSegment
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endif
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externNP gcompact
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externNP get_physical_address
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externNP GrowHeap
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externNP guncompact
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;-----------------------------------------------------------------------;
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; genter ;
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; ;
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; Enters a critical region for the global heap. ;
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; ;
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; Arguments: ;
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; none ;
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; ;
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; Returns: ;
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; DS:DI = address of GlobalInfo for global heap ;
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; FS = Kernel Data segment ;
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; ;
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; Error Returns: ;
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; ;
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; Registers Preserved: ;
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; All ;
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; ;
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; Registers Destroyed: ;
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; ;
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; Calls: ;
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; ;
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; History: ;
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; ;
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; Mon Sep 29, 1986 03:05:33p -by- David N. Weise [davidw] ;
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; Added this nifty comment block. ;
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;-----------------------------------------------------------------------;
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cProc genter,<PUBLIC,NEAR>
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cBegin nogen
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SetKernelDS FS
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mov ds,pGlobalHeap
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xor edi,edi
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inc [di].gi_lrulock
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ret
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UnSetKernelDS FS
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cEnd nogen
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;-----------------------------------------------------------------------;
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; gleave ;
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; ;
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; Leaves a critical region for the global heap. ;
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; ;
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; Arguments: ;
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; DS:DI = address of GlobalInfo for global heap ;
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; ;
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; Returns: ;
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; ;
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; Error Returns: ;
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; ;
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; Registers Preserved: ;
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; ;
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; Registers Destroyed: ;
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; ;
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; Calls: ;
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; ;
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; History: ;
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; ;
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; Mon Sep 29, 1986 03:07:53p -by- David N. Weise [davidw] ;
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; Added this nifty comment block. ;
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;-----------------------------------------------------------------------;
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cProc gleave,<PUBLIC,NEAR>
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cBegin nogen
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dec ds:[gi_lrulock]
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jnz short gl_ret
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test ds:[gi_flags],GIF_INT2
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jz short gl_ret
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and ds:[gi_flags],NOT GIF_INT2
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int 02h
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gl_ret: ret
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cEnd nogen
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;-----------------------------------------------------------------------;
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; gavail ;
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; ;
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; Gets the available memory. ;
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; ;
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; Arguments: ;
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; DX = number of paragraphs wanted ;
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; DS:DI = master object ;
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; Returns: ;
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; AX = #paragraphs available for the biggest block ;
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; DX = 0 ;
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; ;
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; Error Returns: ;
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; none ;
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; ;
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; Registers Preserved: ;
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; DI,DS ;
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; Registers Destroyed: ;
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; BX,CX,SI,ES ;
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; Calls: ;
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; gcompact ;
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; ;
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; History: ;
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; Thu Apr 06, 1988 08:00:00a -by- Tim Halvorsen [iris] ;
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; Fix bug in computation of space available when GA_NOT_THERE object ;
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; resides above discard fence. ;
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; ;
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; Wed Oct 15, 1986 05:09:27p -by- David N. Weise [davidw] ;
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; Moved he_count to ga_count. ;
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; ;
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; Sat Sep 27, 1986 09:37:27a -by- David N. Weise [davidw] ;
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; Reworked it. ;
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;-----------------------------------------------------------------------;
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cProc gavail,<PUBLIC,NEAR>
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cBegin nogen
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push esi
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push ecx
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mov byte ptr [di].gi_cmpflags,0
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call gcompact
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mov cx,word ptr [di].gi_disfence_hi ; ECX has address of fence
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shl ecx, 16
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mov cx,word ptr [di].gi_disfence_lo
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mov esi,[di].phi_first
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xor edx,edx
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loop_for_beginning:
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xor eax,eax
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mov esi,ds:[esi].pga_next ; Next block
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cmp ds:[esi].pga_sig,GA_ENDSIG ; End of arena?
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je all_done
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mov ebx, ds:[esi].pga_address
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add ebx, ds:[esi].pga_size ; End of block
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sub ebx, ecx ; Below fence?
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jbe short include_it ; yes, use it
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cmp ebx, ds:[di].gi_reserve ; Difference > reserve?
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jb all_done ; no, can't use it
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include_it:
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cmp ds:[esi].pga_owner,di ; Free?
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jz short how_big_is_it ; Yes calculate length
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cmp ds:[esi].pga_owner,GA_NOT_THERE ; Marker arena?
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jz short loop_for_beginning ; Yes, next block
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mov bx,ds:[esi].pga_handle
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test bl, GA_FIXED ; Fixed?
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jnz short loop_for_beginning ; Yes, next block
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cmp ds:[esi].pga_count,0 ; Locked?
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jne short loop_for_beginning ; Yes, next block
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lar ebx, ebx ; See lar docs and protect.inc
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test ebx, DSC_DISCARDABLE SHL 16 ; bit is in third byte of EBX
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jz short loop_for_beginning ; Not discardable, next block
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how_big_is_it:
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mov eax,ds:[esi].pga_size ; Use this size
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loop_for_bigness:
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mov esi,ds:[esi].pga_next ; Next block
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cmp ds:[esi].pga_owner,di ; Free?
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jz short include_his_size ; Yes, include size
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cmp ds:[esi].pga_owner,GA_NOT_THERE ; Marker arena?
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jz short end_of_bigness ; Yes
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cmp ds:[esi].pga_sig,GA_ENDSIG ; End of arena?
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jz short end_of_bigness
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mov bx,ds:[esi].pga_handle
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test bx,GA_FIXED ; Fixed?
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jnz short end_of_bigness ; Yes, stop looking
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cmp ds:[esi].pga_count,0 ; Locked?
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jne short end_of_bigness ; Yes, stop looking
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lar ebx, ebx ; See lar docs and protect.inc
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test ebx, DSC_DISCARDABLE SHL 16 ; bit is in third byte of EBX
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jz short loop_for_bigness ; No, dont include in count then
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include_his_size: ; Free or Discardable
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add eax,ds:[esi].pga_size ; Increase available space
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jmp loop_for_bigness
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end_of_bigness:
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mov esi, ds:[esi].pga_prev ; Get end of useable block
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mov ebx, ds:[esi].pga_address
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add ebx, ds:[esi].pga_size
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mov esi, ds:[esi].pga_next
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sub ebx, ecx ; Subtract fence
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jbe short all_below_fence
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cmp ebx, ds:[di].gi_reserve
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jae short all_below_fence
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sub eax,ebx ; We are above the fence, subtract
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; that above the fence and say goodbye
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all_below_fence:
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cmp eax,edx ; Did we find a bigger block?
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jbe short blech_o_rama ; No, then look again
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mov edx,eax ; Yes, remember size
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blech_o_rama:
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jmp loop_for_beginning
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all_done:
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mov eax,edx
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sub eax, 20h ; Dont be too exact
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or eax,eax ; See if negative
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jns short gcfinal
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xor eax, eax ; Disallow negative returns
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gcfinal:
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and al,NOT 1Fh ; round down to nearest alignment
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xor dx,dx
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pop ecx
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pop esi
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ret
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cEnd nogen
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;-----------------------------------------------------------------------;
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; greserve ;
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; ;
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; Sets the size of the discardable code reserve area. ;
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; If the new size is larger than the old size, it checks to see ;
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; if there is enough room to support the new size. ;
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; ;
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; Arguments: ;
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; AX = new greserve size ;
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; ;
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; Returns: ;
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; CX = the largest greserve we can get ;
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; AX != 0 success ;
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; AX = 0 failure ;
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; ;
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; Error Returns: ;
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; ;
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; Registers Preserved: ;
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; DI,SI,DS ;
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; ;
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; Registers Destroyed: ;
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; BX,DX,ES ;
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; ;
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; Calls: ;
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; genter ;
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; gcompact ;
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; will_gi_reserve_fit ;
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; gleave ;
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; ;
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; History: ;
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; Fri Jun 14, 1991 -by- Craig A. Critchley [craigc] ;
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; Lots has happened since 1987 - undo change to get 128K always in ;
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; enhanced mode ;
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; ;
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; Tue May 19, 1987 00:03:08p -by- David N. Weise [davidw] ;
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; Made it far. ;
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; ;
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; Sat Sep 27, 1986 01:03:08p -by- David N. Weise [davidw] ;
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; Made it perform according to spec and added this nifty comment block. ;
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc greserve,<PUBLIC,FAR> ; FAR because of the gcompact below
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localD new_size
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cBegin
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GENTER32
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ReSetKernelDS FS
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movzx eax, ax
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shl eax, 4 ; convert to bytes
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mov ebx, eax
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shl eax, 1 ; double it
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add eax, ebx ; triple it!
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; hold 3 64k segs for rep move case
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cmp eax, 030000h ; if >= 192K, THAT'S ENOUGH!
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jb short no_extra ; So there, Mr EXCEL!
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krDebugOut <DEB_TRACE OR DEB_KrMemMan>, "greserve: Who wants > 192K?"
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mov eax, 030000h
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no_extra:
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add eax,GA_ALIGN_BYTES
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and al,byte ptr GA_MASK_BYTES
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mov new_size,eax
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mov ebx,eax
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mov eax, ds:[di].phi_last
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mov eax, ds:[eax].pga_address
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sub eax,ebx ; Address of new gi_reserve
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cmp ebx, [di].gi_reserve ; New value <= old?
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ja short @F
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;jmp new_okay
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; never reduce the reserve to less than 192K!!!
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cmp ebx, 30000h
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jae new_okay
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;krDebugOut <DEB_TRACE OR DEB_KrMemMan>, "greserve: Ignoring reduction of reserve area."
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or ax, 1 ; success code
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jmp gr_exit
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@@:
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if KDEBUG
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mov ecx, ebx
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shr ecx, 16
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krDebugOut <DEB_TRACE OR DEB_KrMemMan>, "greserve: #cx#BX bytes"
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endif
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call will_gi_reserve_fit
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jnc short new_okay
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push eax ; Must be junk in the way!
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push edx
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; removed a compact here
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mov ecx, new_size
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call guncompact ; slide stuff down
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pop edx
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pop eax
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call will_gi_reserve_fit
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jnc short new_okay
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mov edx, new_size
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;win95 has; or byte ptr fs:[Heap_Insert_Position], 1 ; insert at end
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call GrowHeap ; Assume this will insert new blk at end
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jc short will_not_fit
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mov eax, ds:[di].phi_last
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mov eax, ds:[eax].pga_address
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sub eax, new_size
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call will_gi_reserve_fit
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jnc short new_okay
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will_not_fit:
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if KDEBUG
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krDebugOut DEB_ERROR, "greserve doesn't fit"
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INT3_NEVER ; fixed at 192k, see ldboot.asm
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endif
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xor ax,ax
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jmps gr_exit
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new_okay:
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mov word ptr [di].gi_disfence_lo,ax
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shr eax, 16
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mov word ptr [di].gi_disfence_hi,ax
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mov edx,new_size
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mov [di].gi_reserve,edx
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or ax, 1 ; success code
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gr_exit:
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GLEAVE32
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UnSetKernelDS FS
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cEnd
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;-----------------------------------------------------------------------;
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; will_gi_reserve_fit ;
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; ;
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; See if new size okay by scanning arena backwards. If not under EMS ;
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; this is trivial. With EMS we take into consideration the disjoint ;
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; areas and the WRAITHS. ;
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; ;
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; Arguments: ;
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; EAX = gi_disfence ;
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; DS:DI = master object ;
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; ;
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; Returns: ;
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; CF = 0 new size ok ;
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; CF = 1 new size NOT ok ;
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; ;
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; Error Returns: ;
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; ;
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; Registers Preserved: ;
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; AX,DX,DI,SI,DS ;
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; ;
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; Registers Destroyed: ;
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; none ;
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; ;
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; Calls: ;
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; nothing ;
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; ;
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; History: ;
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; ;
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; Sun Jul 12, 1987 08:13:23p -by- David N. Weise [davidw] ;
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; Added EMS support. ;
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; ;
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; Sat Sep 27, 1986 01:03:57p -by- David N. Weise [davidw] ;
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; Rewrote it. ;
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;-----------------------------------------------------------------------;
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assumes ds, nothing
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assumes es, nothing
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cProc will_gi_reserve_fit,<PUBLIC,NEAR>
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cBegin nogen
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push esi
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mov esi, [di].phi_last
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mov esi, [esi].pga_prev ; skip sentinal
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does_it_fit:
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mov esi, [esi].pga_prev ; do first to skip nothere
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cmp [esi].pga_owner, di ; is it free?
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je short ok_thisll_fit
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test [esi].pga_flags, GA_DISCCODE ; is it code?
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jz short nope_wont_fit
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ok_thisll_fit:
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cmp eax, [esi].pga_address ; do we have enough
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jb short does_it_fit
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it_all_fits:
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clc ; return excellent!
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pop esi
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ret
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nope_wont_fit:
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stc ; return heinous!
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pop esi
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ret
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cEnd nogen
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;-----------------------------------------------------------------------;
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; gnotify ;
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; ;
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; This is where the hard job of updating the stacks and thunks happens. ;
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; We only walk stacks and thunks for code and data (defined by being ;
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; LocalInit'ed), not for resources or task allocated segments. ;
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; ;
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; Arguments: ;
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; AL = message code ;
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; BX = handle ;
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; CX = optional argument ;
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; ESI = address of arena header ;
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; ;
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; Returns: ;
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; AX = return value from notify proc or AL ;
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; DS = current DS (i.e. if DATA SEG was moved then DS is updated. ;
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; ZF = 1 if AX = 0 ;
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; ;
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; Error Returns: ;
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; ;
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; Registers Preserved: ;
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; DI,SI ;
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; ;
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; Registers Destroyed: ;
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; BX,CX,DX,ES ;
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; ;
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; Calls: ;
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; ;
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; History: ;
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; ;
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; Wed Jun 24, 1987 03:08:39a -by- David N. Weise [davidw] ;
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; Adding support for Global Notify. ;
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; ;
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; Wed Dec 03, 1986 01:59:27p -by- David N. Weise [davidw] ;
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; Added this nifty comment block. ;
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;-----------------------------------------------------------------------;
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cProc gnotify,<PUBLIC,NEAR>
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cBegin nogen
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push si
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push di
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xor ah,ah
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mov di,cx
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mov cx,ax
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loop notify_discard
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errnz <GN_MOVE - 1>
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mov cx,ds
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cmp cx,bx ; Did we move DS?
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jne short notify_exit_0 ; No, continue
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notify_exit_0:
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jmp notify_exit
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notify_discard:
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loop notify_exit_0
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errnz <GN_DISCARD - 2>
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;-----------------------------------------------------------------------;
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; Here for a segment discarded. ;
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;-----------------------------------------------------------------------;
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xor ax,ax
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test bl,1
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jnz short notify_exit_0 ; SDK is wrong, can't free fixed.
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push ebx
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lar ebx, ebx ; See lar docs and protect.inc
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test ebx, DSC_DISCARDABLE SHL 16 ; bit is in third byte of EBX
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pop ebx
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jz short notify_exit_0
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test ds:[esi].pga_flags,GAH_NOTIFY
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jnz @F
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jmp dont_bother_asking
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@@:
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push bx
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push cx
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push dx
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mov ax,1
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mov es,ds:[esi].pga_owner
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cmp es:[ne_magic],NEMAGIC
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jz short dont_ask ; doesn't belong to a particular task
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mov ax,es
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SetKernelDS es
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push HeadTDB ; Look for TDB that owns this block.
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UnSetKernelDS es
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find_TDB:
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pop cx
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jcxz dont_ask
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mov es,cx
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push es:[TDB_next]
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cmp ax,es:[TDB_PDB]
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jnz short find_TDB
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pop cx ; clear stack in 1 byte
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mov cx,word ptr es:[TDB_GNotifyProc][0] ; paranoia
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or cx,word ptr es:[TDB_GNotifyProc][2]
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jz short dont_ask
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push ds
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SetKernelDS
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or Kernel_Flags[1],kf1_GLOBALNOTIFY
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push Win_PDB ; Save current PDB
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mov Win_PDB, ax ; Ensure it is the task's
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push fs
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push dword ptr es:[TDB_GNotifyProc]
|
|
|
|
push bx ; push arg for notify proc
|
|
|
|
mov ax,ss ; Zap segment regs so DS
|
|
mov ds,ax ; doesn't get diddled by callee
|
|
mov es,ax
|
|
|
|
mov bx,sp
|
|
call dword ptr ss:[bx]+2
|
|
add sp,4 ; clean up stack.
|
|
|
|
SetKernelDS
|
|
and Kernel_Flags[1],not kf1_GLOBALNOTIFY
|
|
|
|
pop fs
|
|
pop Win_PDB ; Restore PDB
|
|
|
|
pop ds
|
|
UnSetKernelDS
|
|
dont_ask:
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
or ax,ax ; Well, can we?
|
|
jz short notify_exit
|
|
dont_bother_asking:
|
|
|
|
mov es,ds:[esi].pga_owner
|
|
cmp es:[ne_magic],NEMAGIC
|
|
jnz short not_in_exe
|
|
mov di,es:[ne_segtab]
|
|
mov cx,es:[ne_cseg]
|
|
jcxz not_in_exe
|
|
pt0a:
|
|
cmp bx,es:[di].ns_handle
|
|
jz short pt0b
|
|
add di,SIZE NEW_SEG1
|
|
loop pt0a
|
|
jmps not_in_exe
|
|
pt0b:
|
|
and byte ptr es:[di].ns_flags,not NSLOADED ; Mark as not loaded.
|
|
not_in_exe:
|
|
|
|
why_bother_again:
|
|
xor di,di
|
|
if SDEBUG
|
|
cCall DebugMovedSegment,<si,di>
|
|
endif
|
|
mov ax,1
|
|
notify_exit:
|
|
or ax,ax
|
|
pop di
|
|
pop si
|
|
ret
|
|
|
|
gn_error:
|
|
kerror 0FFh,<gnotify - cant discard segment>,si,si
|
|
xor ax,ax
|
|
jmp notify_exit
|
|
|
|
cEnd nogen
|
|
|
|
;-----------------------------------------------------------------------;
|
|
; MemoryFreed ;
|
|
; ;
|
|
; This call is apps that have a GlobalNotify procedure. Some apps ;
|
|
; may shrink the segment instead of allowing it to be discarded, or ;
|
|
; they may free other blocks. This call tells the memory manager ;
|
|
; that some memory was freed somewhere. ;
|
|
; ;
|
|
; Arguments: ;
|
|
; WORD = # paragraphs freed ;
|
|
; ;
|
|
; Returns: ;
|
|
; DX:AX = amount of memory that still needs freeing ;
|
|
; ;
|
|
; Error Returns: ;
|
|
; ;
|
|
; Registers Preserved: ;
|
|
; ;
|
|
; Registers Destroyed: ;
|
|
; ;
|
|
; Calls: ;
|
|
; ;
|
|
; History: ;
|
|
; ;
|
|
; Fri 08-Apr-1988 10:25:55 -by- David N. Weise [davidw] ;
|
|
; Wrote it! ;
|
|
;-----------------------------------------------------------------------;
|
|
|
|
cProc MemoryFreed,<PUBLIC,FAR>
|
|
|
|
parmW memory_freed
|
|
cBegin
|
|
xor ax,ax
|
|
SetKernelDS
|
|
test Kernel_Flags[1],kf1_GLOBALNOTIFY
|
|
jz short mf_done
|
|
mov ds,pGlobalHeap
|
|
UnSetKernelDS
|
|
mov ax,memory_freed
|
|
or ax,ax
|
|
jz short mf_inquire
|
|
or ds:[hi_ncompact],1 ; Remember we discarded something
|
|
sub ds:[hi_distotal],ax ; Have we discarded enough yet?
|
|
ja short mf_inquire
|
|
or ds:[hi_ncompact],10h ; To tell gdiscard that we're done.
|
|
mf_inquire:
|
|
mov ax,ds:[hi_distotal] ; Have we discarded enough yet?
|
|
mf_done:
|
|
xor dx,dx
|
|
|
|
cEnd
|
|
|
|
|
|
;-----------------------------------------------------------------------;
|
|
; SetSwapAreaSize ;
|
|
; ;
|
|
; Sets the current task's code swap area size. ;
|
|
; ;
|
|
; Arguments: ;
|
|
; WORD == 0 then current size is just returned ;
|
|
; != 0 number paragraphs wanted for swap area ;
|
|
; Returns: ;
|
|
; AX = Size actually set ;
|
|
; DX = Max size you can get ;
|
|
; ;
|
|
; Error Returns: ;
|
|
; ;
|
|
; Registers Preserved: ;
|
|
; ;
|
|
; Registers Destroyed: ;
|
|
; ;
|
|
; Calls: ;
|
|
; ;
|
|
; History: ;
|
|
; This API is history!!!! ;
|
|
; swap area is now fixed at 192k we don't grow or shrink it ;
|
|
; ;
|
|
;-----------------------------------------------------------------------;
|
|
|
|
|
|
cProc SetSwapAreaSize,<PUBLIC,FAR>
|
|
parmW nParas
|
|
cBegin
|
|
SetKernelDS
|
|
mov dx,MaxCodeSwapArea
|
|
mov ax,dx
|
|
cEnd
|
|
|
|
sEnd CODE
|
|
|
|
end
|