200 lines
4 KiB
NASM
200 lines
4 KiB
NASM
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.xlist
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include kernel.inc
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include protect.inc
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.list
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.386p
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DataBegin
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externB fBooting
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externW pGlobalHeap
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DataEnd
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sBegin CODE
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assumes CS,CODE
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if KDEBUG
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externNP check_lru_list
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externNP check_free_list
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externFP ValidateFreeSpaces
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;-----------------------------------------------------------------------;
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; CheckGlobalHeap ;
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; ;
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; The Global Heap is checked for consistency. First the forward links ;
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; are examined to make sure they lead from the hi_first to the hi_last. ;
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; Then the backward links are checked to make sure they lead from the ;
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; hi_last to the hi_first. Then the arenas are sequentially checked ;
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; to see that the moveable entries point to allocated handles and that ;
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; said handles point back. The handle table is then checked to see ;
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; that the number of used handles match the number of referenced ;
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; handles, and that the number of total handles matches the sum of the ;
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; free, discarded, and used handles. Finally the free list of handles ;
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; is checked. ;
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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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; CF = 0 everything is just fine ;
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; all registers preserved ;
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; ;
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; Error Returns: ;
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; CF = 1 ;
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; DX = offending arena header ;
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; AX = 01h Forward links invalid ;
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; 02h Backward links invalid ;
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; 04h ga_handle points to free handle ;
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; 08h arena points to handle but not vice versa ;
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; 80h ga_sig is bad ;
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; DX = 0 ;
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; AX = 10h allocated handles don't match used handles ;
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; 20h total number of handles don't match up ;
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; 40h total number of free handles don't match up ;
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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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; Sat Nov 01, 1986 02:16:46p -by- David N. Weise [davidw] ;
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; Rewrote it from C into assembly. ;
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc CheckGlobalHeap,<PUBLIC,NEAR>
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cBegin nogen
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push eax
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push edx
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push ebx
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push ecx
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push edi
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push esi
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push ds
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push es
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push fs
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push gs
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xor eax,eax
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xor edx,edx
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xor edi,edi
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SetKernelDS es
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cmp pGlobalHeap,di
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jnz short there_is_a_GlobalHeap
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jmp all_done
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there_is_a_GlobalHeap:
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;;; test fBooting, 1
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;;; jnz no_check
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mov ds,pGlobalHeap
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;;; UnSetKernelDS
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cmp [di].hi_check,di
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jnz short checking_enabled
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no_check:
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;;; jmp all_done
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checking_enabled:
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mov cx,[di].hi_count
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mov esi,[di].phi_first
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;;; mov es, dx
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forward_ho:
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push cx
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mov eax, ds:[esi].pga_address
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mov ecx, ds:[esi].pga_size
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cmp ds:[esi].pga_owner, GA_NOT_THERE
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je short no_limit_check
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cmp ds:[esi].pga_owner, GA_BURGERMASTER
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je short no_limit_check
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cmp ds:[esi].pga_owner, di
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je short no_limit_check
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cmp ds:[esi].pga_handle, di
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je short no_limit_check
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test fBooting, 1
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jnz short no_limit_check
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mov bx, ds:[esi].pga_handle
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dec ecx
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Handle_To_Sel bl
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lsl ebx, ebx
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jnz short bad_limit
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cmp ecx, ebx
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je short ok_limit
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bad_limit:
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int 3
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ok_limit:
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no_limit_check:
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add eax, ds:[esi].pga_size
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mov ebx, ds:[esi].pga_next
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mov edx, ds:[ebx].pga_address
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cmp eax, edx
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pop cx
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xchg esi, ebx
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jne short forward_size_mismatch
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cmp ebx, ds:[esi].pga_prev
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jz short size_and_next_match
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forward_size_mismatch:
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cmp ds:[esi].pga_owner, GA_NOT_THERE
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je short size_and_next_match
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cmp cx,1
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jnz short forward_links_invalid
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size_and_next_match:
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loop xxxx
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cmp ebx,[di].phi_last
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jz short forward_links_okay
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forward_links_invalid:
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int 3
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mov edx,ebx
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mov ax,1
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jmps all_done
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xxxx:
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jmp forward_ho
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UnSetKernelDS es
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forward_links_okay:
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xor ax, ax
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call check_lru_list
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call check_free_list
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; push cs
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; call near ptr ValidateFreeSpaces
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clear_dx_all_done:
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xor dx,dx
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all_done:
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pop gs
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pop fs
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pop es
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pop ds
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pop esi
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pop edi
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pop ecx
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pop ebx
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or ax,ax
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jnz short cgh_error
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pop edx
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pop eax
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ret
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cgh_error:
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int 3
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add sp,8
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stc
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ret
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cEnd nogen
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endif
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sEnd CODE
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end
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