WebSVN – Kolibri OS – Diff – /kernel/branches/kolibri_pe/core/v86.inc



;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 

$Revision: 897 $
 

; Virtual-8086 mode manager

; First is main page directory for V86 mode.
; Second page:
; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
; second half is for V86-to-linear translation.
; Third and fourth are for I/O permission map.
 
        mov ecx, 0x4000
        mov edx, PG_SW
        call    @mem_alloc@8
        test    eax, eax
        jz      .fail2
 
        mov     [ebx+V86_machine.pagedir], eax
        push    edi eax
        mov     edi, eax
        add     eax, 1800h
        mov     [ebx+V86_machine.pages], eax

        pop     eax
; page directory: first entry is page table...
        mov     edi, eax
        add     eax, 1000h
        push    eax
        call    get_pg_addr
        or      al, PG_UW
        stosd
; ...and also copy system page tables
; thx to Serge, system is located at high addresses
        add     edi, (HEAP_BASE shr 20) - 4
        push    esi
        mov     esi, (HEAP_BASE shr 20) + _sys_pdbr
        mov     ecx, 0x80000000 shr 22
        rep     movsd

 
        mov     eax, [ebx+V86_machine.pagedir]   ;root dir also is

@@:
        lea     eax, [edx + OS_BASE]
        mov     [edi+800h], eax
        lea     eax, [edx + 111b]
        stosd
        add     edx, 0x1000
        loop    @b
        pop     eax
        pop     edi
; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
; physical address = 0xC0000

; destroys: eax, ebx, ecx, edx (due to free)
v86_destroy:
        push    eax

 
 
        mov ecx, [eax+V86_machine.pagedir]

        call @mem_free@4
 

        pop     eax

        call    get_pg_addr
        inc     eax
        push    dword [ecx+APPDATA.io_map]
        push    dword [ecx+APPDATA.io_map+4]
        mov     dword [ecx+APPDATA.io_map], eax
    ;    mov     dword [page_tabs + (tss._io_map_0 shr 10)], eax
        add     eax, 0x1000
        mov     dword [ecx+APPDATA.io_map+4], eax
    ;    mov     dword [page_tabs + (tss._io_map_1 shr 10)], eax

 
        push    [ecx+APPDATA.dir_table]
        push    [ecx+APPDATA.saved_esp0]
        mov     [ecx+APPDATA.saved_esp0], esp

        mov     [tss._esp0], eax
        pop     eax
        mov     [SLOT_BASE+ecx+APPDATA.dir_table], eax
        pop     ebx
        mov     dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx
      ;  mov     dword [page_tabs + (tss._io_map_1 shr 10)], ebx
        pop     ebx
        mov     dword [SLOT_BASE+ecx+APPDATA.io_map], ebx
      ;  mov     dword [page_tabs + (tss._io_map_0 shr 10)], ebx
        mov     cr3, eax
;        mov     [irq_tab+5*4], 0
        sti

 

Rev 887	Rev 897
Line 3...	Line 3...
3	;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;	3	;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
4	;; Distributed under terms of the GNU General Public License ;;	4	;; Distributed under terms of the GNU General Public License ;;
5	;; ;;	5	;; ;;
6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Line 7...	Line 7...
7		7
Line 8...	Line 8...
8	$Revision: 887 $	8	$Revision: 897 $
9		9
Line 10...	Line 10...
10	; Virtual-8086 mode manager	10	; Virtual-8086 mode manager
Line 47...	Line 47...
47	; First is main page directory for V86 mode.	47	; First is main page directory for V86 mode.
48	; Second page:	48	; Second page:
49	; first half (0x800 bytes) is page table for addresses 0 - 0x100000,	49	; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
50	; second half is for V86-to-linear translation.	50	; second half is for V86-to-linear translation.
51	; Third and fourth are for I/O permission map.	51	; Third and fourth are for I/O permission map.
-		52
52	mov ecx, 2	53	mov ecx, 0x4000
-		54	mov edx, PG_SW
53	call @core_alloc@4	55	call @mem_alloc@8
54	test eax, eax	56	test eax, eax
55	jz .fail2	57	jz .fail2
56	add eax, OS_BASE	-
57	mov [ebx+V86_machine.pagedir], eax	58	mov [ebx+V86_machine.pagedir], eax
58	push edi eax	59	push edi eax
59	mov edi, eax	60	mov edi, eax
60	add eax, 1800h	61	add eax, 1800h
61	mov [ebx+V86_machine.pages], eax	62	mov [ebx+V86_machine.pages], eax
Line 70...	Line 71...
70	pop eax	71	pop eax
71	; page directory: first entry is page table...	72	; page directory: first entry is page table...
72	mov edi, eax	73	mov edi, eax
73	add eax, 1000h	74	add eax, 1000h
74	push eax	75	push eax
75	sub eax, OS_BASE	76	call get_pg_addr
76	or al, PG_UW	77	or al, PG_UW
77	stosd	78	stosd
78	; ...and also copy system page tables	79	; ...and also copy system page tables
79	; thx to Serge, system is located at high addresses	80	; thx to Serge, system is located at high addresses
80	add edi, (OS_BASE shr 20) - 4	81	add edi, (HEAP_BASE shr 20) - 4
81	push esi	82	push esi
82	mov esi, (OS_BASE shr 20) + _sys_pdbr	83	mov esi, (HEAP_BASE shr 20) + _sys_pdbr
83	mov ecx, 0x80000000 shr 22	84	mov ecx, 0x80000000 shr 22
84	rep movsd	85	rep movsd
Line 85...	Line 86...
85		86
86	mov eax, [ebx+V86_machine.pagedir] ;root dir also is	87	mov eax, [ebx+V86_machine.pagedir] ;root dir also is
Line 108...	Line 109...
108	@@:	109	@@:
109	lea eax, [edx + OS_BASE]	110	lea eax, [edx + OS_BASE]
110	mov [edi+800h], eax	111	mov [edi+800h], eax
111	lea eax, [edx + 111b]	112	lea eax, [edx + 111b]
112	stosd	113	stosd
-		114	add edx, 0x1000
113	loop @b	115	loop @b
114	pop eax	116	pop eax
115	pop edi	117	pop edi
116	; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)	118	; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
117	; physical address = 0xC0000	119	; physical address = 0xC0000
Line 143...	Line 145...
143	; destroys: eax, ebx, ecx, edx (due to free)	145	; destroys: eax, ebx, ecx, edx (due to free)
144	v86_destroy:	146	v86_destroy:
145	push eax	147	push eax
Line 146...	Line 148...
146		148
147	mov ecx, [eax+V86_machine.pagedir]	-
148	sub ecx, OS_BASE	149	mov ecx, [eax+V86_machine.pagedir]
Line 149...	Line 150...
149	call @core_free@4	150	call @mem_free@4
150		151
Line 151...	Line 152...
151	pop eax	152	pop eax
Line 298...	Line 299...
298	call get_pg_addr	299	call get_pg_addr
299	inc eax	300	inc eax
300	push dword [ecx+APPDATA.io_map]	301	push dword [ecx+APPDATA.io_map]
301	push dword [ecx+APPDATA.io_map+4]	302	push dword [ecx+APPDATA.io_map+4]
302	mov dword [ecx+APPDATA.io_map], eax	303	mov dword [ecx+APPDATA.io_map], eax
303	mov dword [page_tabs + (tss._io_map_0 shr 10)], eax	304	; mov dword [page_tabs + (tss._io_map_0 shr 10)], eax
304	add eax, 0x1000	305	add eax, 0x1000
305	mov dword [ecx+APPDATA.io_map+4], eax	306	mov dword [ecx+APPDATA.io_map+4], eax
306	mov dword [page_tabs + (tss._io_map_1 shr 10)], eax	307	; mov dword [page_tabs + (tss._io_map_1 shr 10)], eax
Line 307...	Line 308...
307		308
308	push [ecx+APPDATA.dir_table]	309	push [ecx+APPDATA.dir_table]
309	push [ecx+APPDATA.saved_esp0]	310	push [ecx+APPDATA.saved_esp0]
310	mov [ecx+APPDATA.saved_esp0], esp	311	mov [ecx+APPDATA.saved_esp0], esp
Line 818...	Line 819...
818	mov [tss._esp0], eax	819	mov [tss._esp0], eax
819	pop eax	820	pop eax
820	mov [SLOT_BASE+ecx+APPDATA.dir_table], eax	821	mov [SLOT_BASE+ecx+APPDATA.dir_table], eax
821	pop ebx	822	pop ebx
822	mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx	823	mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx
823	mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx	824	; mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx
824	pop ebx	825	pop ebx
825	mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx	826	mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx
826	mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx	827	; mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx
827	mov cr3, eax	828	mov cr3, eax
828	; mov [irq_tab+5*4], 0	829	; mov [irq_tab+5*4], 0
829	sti	830	sti
Line 830...	Line 831...
830		831

Subversion Repositories Kolibri OS

(root)/kernel/branches/kolibri_pe/core/v86.inc – Rev 887 → 897