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;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 1055 $
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$Revision: 1056 $
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542 
           and eax, 0xFFFFF000
 542 
           and eax, 0xFFFFF000
543 
           ret
 543 
           ret
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544 
 
 544 
 
- 
 
 545 
 
545 
 
 546 
align 4
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546 
align 4
 - 
 
547 
proc page_fault_handler
 547 
; Now it is called from sys32::exc_c (see stack frame there)
Line 548... Line -...
548 
 
 - 
 
549 
        test    byte [esp+12+2], 2
 - 
 
550 
        jnz     v86_page_fault
 - 
 
551 
 
 - 
 
552 
        .err_code equ ebp+32
 548 
proc page_fault_handler
553 
        .err_addr equ ebp-4
 549 
 
554 
 
 - 
 
555 
           pushad
 - 
 
556 
           mov ebp, esp
 550 
    .err_addr   equ ebp-4
557 
           mov eax, cr2
 - 
 
558 
           push eax
 - 
 
559 
 
 - 
 
560 
           mov ax, app_data
 551 
 
Line 561... Line 552...
561 
           mov ds, ax
 552 
        mov     ebp, esp
562 
           mov es, ax
 553 
        mov     ebx, cr2
563 
 
 554 
        push    ebx               ; that is locals: .err_addr = cr2
564 
           inc [pg_data.pages_faults]
 555 
        inc     [pg_data.pages_faults]
565 
 
 556 
 
566 
;     push eax
 557 
;     push eax
567 
;     push edx
 558 
;     push edx
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568 
;     mov edx, 0x400   ;bochs
 - 
 
569 
;     mov al,0xff      ;bochs
 559 
;     mov edx, 0x400   ;bochs
Line 570... Line 560...
570 
;     out dx, al       ;bochs
 560 
;     mov al,0xff      ;bochs
571 
;     pop edx
 561 
;     out dx, al       ;bochs
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572 
;     pop eax
 562 
;     pop edx
573 
 
 563 
;     pop eax
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574 
           mov ebx, [.err_addr]
 564 
 
575 
           mov eax, [.err_code]
 565 
        mov     eax, [pf_err_code]
576 
 
 566 
 
577 
           cmp ebx, OS_BASE
 - 
 
- 
 
 567 
        cmp     ebx, OS_BASE      ;ebx == .err_addr
578 
           jb .user_space      ;ñòðàíèöà â ïàìÿòè ïðèëîæåíèÿ ;
 568 
        jb      .user_space       ;ñòðàíèöà â ïàìÿòè ïðèëîæåíèÿ ;
579 
 
 569 
 
580 
           cmp ebx, page_tabs
 570 
        cmp     ebx, page_tabs
581 
           jb .kernel_space    ;ñòðàíèöà â ïàìÿòè ÿäðà
 571 
        jb      .kernel_space     ;ñòðàíèöà â ïàìÿòè ÿäðà
582 
 
 572 
 
583 
           cmp ebx, kernel_tabs
 573 
        cmp     ebx, kernel_tabs
584 
           jb .alloc;.app_tabs ;òàáëèöû ñòðàíèö ïðèëîæåíèÿ ;
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        jb      .alloc;.app_tabs  ;òàáëèöû ñòðàíèö ïðèëîæåíèÿ ;
- 
 
 575 
                                  ;ïðîñòî ñîçäàäèì îäíó
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 576 
if 0 ;ïîêà ýòî ïðîñòî ëèøíåå
- 
 
 577 
        cmp     ebx, LFB_BASE
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 578 
        jb      .core_tabs        ;òàáëèöû ñòðàíèö ÿäðà
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 579 
                                  ;Îøèáêà
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 580 
  .lfb:
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                               ;ïðîñòî ñîçäàäèì îäíó
 - 
 
586 
 
 581 
                                  ;îáëàñòü LFB
587 
           cmp ebx, LFB_BASE
 582 
                                  ;Îøèáêà
588 
           jb .core_tabs       ;òàáëèöû ñòðàíèö ÿäðà
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        jmp     .fail
589 
                               ;Îøèáêà
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end if
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.lfb:
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.core_tabs:
591 
                               ;îáëàñòü LFB
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.fail:  ;simply return to caller
592 
                               ;Îøèáêà
 587 
        mov     esp, ebp
593 
           jmp .fail
 588 
        mov     bl, 14 ;#PF
594 
 
 589 
        ret
595 
align 4
 590 
 
596 
.user_space:
 591 
.user_space:
597 
           test eax, PG_MAP
 592 
        test    eax, PG_MAP
598 
           jnz .err_access     ;Ñòðàíèöà ïðèñóòñòâóåò
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        jnz     .err_access       ;Ñòðàíèöà ïðèñóòñòâóåò
599 
                               ;Îøèáêà äîñòóïà ?
 594 
                                  ;Îøèáêà äîñòóïà ?
600 
 
 595 
 
601 
           shr ebx, 12
 596 
        shr     ebx, 12
602 
           mov ecx, ebx
 597 
        mov     ecx, ebx
603 
           shr ecx, 10
 598 
        shr     ecx, 10
604 
           mov edx, [master_tab+ecx*4]
 599 
        mov     edx, [master_tab+ecx*4]
605 
           test edx, PG_MAP
 600 
        test    edx, PG_MAP
606 
           jz .fail            ;òàáëèöà ñòðàíèö íå ñîçäàíà
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        jz      .fail             ;òàáëèöà ñòðàíèö íå ñîçäàíà
607 
                               ;íåâåðíûé àäðåñ â ïðîãðàììå
 602 
                                  ;íåâåðíûé àäðåñ â ïðîãðàììå
608 
 
 603 
 
- 
 
 604 
        mov     eax, [page_tabs+ebx*4]
- 
 
 605 
        test    eax, 2
- 
 
 606 
        jz      .fail             ;àäðåñ íå çàðåçåðâèðîâàí äëÿ ;
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 607 
                                  ;èñïîëüçîâàíèÿ. Îøèáêà
- 
 
 608 
.alloc:
- 
 
 609 
        call    alloc_page
- 
 
 610 
        test    eax, eax
- 
 
 611 
        jz      .fail
- 
 
 612 
 
- 
 
 613 
        stdcall map_page,[.err_addr],eax,dword PG_UW
- 
 
 614 
 
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609 
           mov eax, [page_tabs+ebx*4]
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610 
           test eax, 2
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611 
           jz .fail            ;àäðåñ íå çàðåçåðâèðîâàí äëÿ ;
 - 
 
612 
                               ;èñïîëüçîâàíèÿ. Îøèáêà
 - 
 
613 
.alloc:
 - 
 
614 
           call alloc_page
 - 
 
615 
           test eax, eax
 - 
 
616 
           jz .fail
 - 
 
617 
 
 - 
 
618 
           stdcall map_page,[ebp-4],eax,dword PG_UW
 - 
 
619 
 
 - 
 
620 
           mov edi, [ebp-4]
 - 
 
621 
           and edi, 0xFFFFF000
 615 
        mov     edi, [.err_addr]
622 
           mov ecx, 1024
 616 
        and     edi, 0xFFFFF000
623 
           xor eax, eax
 617 
        mov     ecx, 1024
Line 624... Line 618...
624 
           cld
 618 
        xor     eax, eax
625 
           rep stosd
 619 
       ;cld     ;caller is duty for this
626 
.exit:
 620 
        rep     stosd
Line 627... Line 621...
627 
           mov esp, ebp
 621 
.exit:  ;iret with repeat fault instruction
628 
           popad
 622 
        add     esp,8 ; clear in stack: locals(.err_addr) + ret_to_caller
629 
           add esp, 4
 623 
        restore_ring3_context
630 
           iretd
 624 
        iretd
631 
 
 625 
 
632 
.err_access:
 626 
.err_access  =  .fail
Line 633... Line 627...
633 
;íèêîãäà íå ïðîèñõîäèò
 627 
;íèêîãäà íå ïðîèñõîäèò
Line 634... Line 628...
634 
           jmp .fail
 628 
       ;jmp     .fail
635 
 
 629 
 
Line 636... Line 630...
636 
.kernel_space:
 630 
.kernel_space:
637 
           test eax, PG_MAP
 631 
        test    eax, PG_MAP
Line 638... Line 632...
638 
           jz .fail        ;ñòðàíèöà íå ïðèñóòñòâóåò
 632 
        jz      .fail   ;ñòðàíèöà íå ïðèñóòñòâóåò
639 
 
 633 
 
Line 640... Line 634...
640 
           test eax, 4     ;U/S
 634 
        test    eax,12  ;U/S (+below)
641 
           jnz .fail       ;ïðèëîæåíèå îáðàòèëîñü ê ïàìÿòè
 635 
        jnz     .fail   ;ïðèëîæåíèå îáðàòèëîñü ê ïàìÿòè
642 
                           ;ÿäðà
 636 
                        ;ÿäðà
643 
           test eax, 8
 637 
       ;test    eax, 8
644 
           jnz .fail       ;óñòàíîâëåí çàðåçåðâèðîâàííûé áèò
 638 
       ;jnz     .fail   ;óñòàíîâëåí çàðåçåðâèðîâàííûé áèò
645 
                           ;â òàáëèöàõ ñòðàíèö. äîáàâëåíî â P4/Xeon
 639 
                        ;â òàáëèöàõ ñòðàíèö. äîáàâëåíî â P4/Xeon
646 
 
 640 
 
647 
;ïîïûòêà çàïèñè â çàùèù¸ííóþ ñòðàíèöó ÿäðà
 641 
;ïîïûòêà çàïèñè â çàùèù¸ííóþ ñòðàíèöó ÿäðà
648 
 
 642 
 
649 
           cmp ebx, tss._io_map_0
 643 
        cmp     ebx, tss._io_map_0
650 
           jb .fail
 644 
        jb      .fail
651 
 
 645 
 
652 
           cmp ebx, tss._io_map_0+8192
 646 
        cmp     ebx, tss._io_map_0+8192
653 
           jae .fail
 647 
        jae     .fail
654 
 
 648 
 
655 
; io permission map
 649 
; io permission map
656 
; copy-on-write protection
 650 
; copy-on-write protection
657 
 
 651 
 
658 
           call alloc_page
 652 
        call    alloc_page
659 
           test eax, eax
 653 
        test    eax, eax
660 
           jz .fail
 654 
        jz      .fail
661 
 
 655 
 
662 
           push eax
 - 
 
663 
           stdcall map_page,[ebp-4],eax,dword PG_SW
 - 
 
664 
           pop eax
 - 
 
665 
           mov edi, [.err_addr]
 - 
 
666 
           and edi, -4096
 - 
 
667 
           lea esi, [edi+(not tss._io_map_0)+1]; -tss._io_map_0
 - 
 
668 
 
 - 
 
669 
           mov ebx, esi
 - 
 
670 
           shr ebx, 12
 - 
 
671 
           mov edx, [current_slot]
 - 
 
672 
           or eax, PG_SW
 - 
 
673 
           mov [edx+APPDATA.io_map+ebx*4], eax
 - 
 
674 
 
 - 
 
675 
           add esi, [default_io_map]
 - 
 
676 
           mov ecx, 4096/4
 - 
 
677 
           cld
 - 
 
678 
           rep movsd
 - 
 
679 
           jmp .exit
 656 
        push    eax
Line 680... Line 657...
680 
 
 657 
        stdcall map_page,[.err_addr],eax,dword PG_SW
681 
 
 658 
        pop     eax
682 
;íå îáðàáàòûâàåì. Îøèáêà
 659 
        mov     edi, [.err_addr]
Line 1344... Line 1321...
1344 
           xor eax, eax
 1321 
           xor eax, eax
1345 
           pop ebx
 1322 
           pop ebx
1346 
.fail:
 1323 
.fail:
1347 
           ret
 1324 
           ret
1348 
endp
 1325 
endp
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