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Rev 7967 Rev 8052
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;; Copyright (C) KolibriOS team 2004-2020. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2020. 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: 7967 $
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$Revision: 8052 $
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align 4
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align 4
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proc alloc_page
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proc alloc_page
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        pushfd
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        pushfd
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        cli
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        cli
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        push    ebx
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        push    ebx
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;//-
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        cmp     [pg_data.pages_free], 1
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        cmp     [pg_data.pages_free], 1
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        jle     .out_of_memory
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        jle     .out_of_memory
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;//-
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        pop     ebx
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        pop     ebx
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        popfd
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        popfd
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        xor     eax, eax
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        xor     eax, eax
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        ret
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        ret
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.found:
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.found:
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;//-
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        dec     [pg_data.pages_free]
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        dec     [pg_data.pages_free]
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        jz      .out_of_memory
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        jz      .out_of_memory
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;//-
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        btr     [ebx], eax
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        btr     [ebx], eax
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        mov     [page_start], ebx
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        mov     [page_start], ebx
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        sub     ebx, sys_pgmap
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        sub     ebx, sys_pgmap
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        lea     eax, [eax+ebx*8]
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        lea     eax, [eax+ebx*8]
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        shl     eax, 12
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        shl     eax, 12
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;//-       dec [pg_data.pages_free]
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;       dec [pg_data.pages_free]
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        pop     ebx
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        pop     ebx
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        popfd
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        popfd
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        ret
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        ret
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;//-
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.out_of_memory:
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.out_of_memory:
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        mov     [pg_data.pages_free], 1
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        mov     [pg_data.pages_free], 1
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        xor     eax, eax
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        xor     eax, eax
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        pop     ebx
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        pop     ebx
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        popfd
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        popfd
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        ret
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        ret
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;//-
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endp
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endp
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align 4
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align 4
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proc alloc_pages stdcall, count:dword
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proc alloc_pages stdcall, count:dword
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        cli
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        cli
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        mov     eax, [count]
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        mov     eax, [count]
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        add     eax, 7
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        add     eax, 7
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        shr     eax, 3
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        shr     eax, 3
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        mov     [count], eax
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        mov     [count], eax
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;//-
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        mov     ebx, [pg_data.pages_free]
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        mov     ebx, [pg_data.pages_free]
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        sub     ebx, 9
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        sub     ebx, 9
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        js      .out_of_memory
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        js      .out_of_memory
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        shr     ebx, 3
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        shr     ebx, 3
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        cmp     eax, ebx
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        cmp     eax, ebx
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        jg      .out_of_memory
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        jg      .out_of_memory
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;//-
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        mov     ecx, [page_start]
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        mov     ecx, [page_start]
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        mov     ebx, [page_end]
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        mov     ebx, [page_end]
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.find:
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.find:
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        mov     edx, [count]
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        mov     edx, [count]
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        mov     edi, ecx
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        mov     edi, ecx
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; param
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; param
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;  eax= linear address
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;  eax= linear address
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;
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;
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; retval
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; retval
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;  eax= phisical page address
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;  eax= physical page address
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align 4
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align 4
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get_pg_addr:
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get_pg_addr:
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        inc     [pg_data.pages_faults]
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        inc     [pg_data.pages_faults]
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        mov     eax, [pf_err_code]
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        mov     eax, [pf_err_code]
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        cmp     ebx, OS_BASE      ;ebx == .err_addr
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        cmp     ebx, OS_BASE      ;ebx == .err_addr
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        jb      .user_space       ;страница в памяти приложения ;
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        jb      .user_space       ;page in application memory
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        cmp     ebx, page_tabs
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        cmp     ebx, page_tabs
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        jb      .kernel_space     ;страница в памяти ядра
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        jb      .kernel_space     ;page in kernel memory
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        cmp     ebx, kernel_tabs
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        cmp     ebx, kernel_tabs
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        jb      .alloc;.app_tabs  ;таблицы страниц приложения ;
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        jb      .alloc;.app_tabs  ;page tables of application ;
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                                  ;просто создадим одну
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                                  ;simply create one
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.core_tabs:
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.core_tabs:
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.fail:  ;simply return to caller
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.fail:  ;simply return to caller
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        mov     esp, ebp
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        mov     esp, ebp
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        pop     ebx               ;restore exception number (#PF)
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        pop     ebx               ;restore exception number (#PF)
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        ret
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        ret
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.user_space:
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.user_space:
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        test    eax, PG_READ
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        test    eax, PG_READ
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        jnz     .err_access       ;Страница присутствует
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        jnz     .err_access       ;Page presents
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                                  ;Ошибка доступа ?
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                                  ;Access error ?
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        shr     ebx, 12
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        shr     ebx, 12
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        mov     ecx, ebx
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        mov     ecx, ebx
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        shr     ecx, 10
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        shr     ecx, 10
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        mov     edx, [master_tab+ecx*4]
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        test    edx, PG_READ
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        mov     edx, [master_tab+ecx*4]
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        test    edx, PG_READ
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        jz      .fail             ;таблица страниц не создана
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        jz      .fail             ;page table is not created
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                                  ;неверный адрес в программе
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                                  ;incorrect address in program
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        mov     eax, [page_tabs+ebx*4]
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        mov     eax, [page_tabs+ebx*4]
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        rep movsd
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        rep movsd
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        jmp     .exit
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        jmp     .exit
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.kernel_space:
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.kernel_space:
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        test    eax, PG_READ
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        test    eax, PG_READ
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        jz      .fail   ;страница не присутствует
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        jz      .fail   ;page does not present
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        test    eax, 12 ;U/S (+below)
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- 
 
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        test    eax, 12 ;U/S (+below)
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        jnz     .fail   ;приложение обратилось к памяти
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        jnz     .fail   ;application requested kernel memory
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                        ;ядра
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       ;test    eax, 8
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- 
 
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       ;test    eax, 8
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       ;jnz     .fail   ;установлен зарезервированный бит
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       ;jnz     .fail   ;the reserved bit is set in page tables. Added in P4/Xeon
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                        ;в таблицах страниц. добавлено в P4/Xeon
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;попытка записи в защищённую страницу ядра
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;an attempt to write to a protected kernel page