WebSVN – Kolibri OS – Blame – /kernel/branches/net/core/v86.inc

Rev	Author	Line No.	Line
1159	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
		3	;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
		4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		7
1206	hidnplayr	8	$Revision: 1206 $
1159	hidnplayr	9
		10	; Virtual-8086 mode manager
		11	; diamond, 2007, 2008
		12
		13	DEBUG_SHOW_IO = 0
		14
		15	struc V86_machine
		16	{
		17	; page directory
		18	.pagedir dd ?
		19	; translation table: V86 address -> flat linear address
		20	.pages dd ?
		21	; mutex to protect all data from writing by multiple threads at one time
		22	.mutex dd ?
		23	; i/o permission map
		24	.iopm dd ?
		25	.size = $
		26	}
		27	virtual at 0
		28	V86_machine V86_machine
		29	end virtual
		30
		31	; Create V86 machine
		32	; in: nothing
		33	; out: eax = handle (pointer to struc V86_machine)
		34	; eax = NULL => failure
		35	; destroys: ebx, ecx, edx (due to malloc)
		36	v86_create:
		37	; allocate V86_machine structure
		38	mov eax, V86_machine.size
		39	call malloc
		40	test eax, eax
		41	jz .fail
		42	; initialize mutex
		43	and dword [eax+V86_machine.mutex], 0
		44	; allocate tables
		45	mov ebx, eax
		46	; We allocate 4 pages.
		47	; First is main page directory for V86 mode.
		48	; Second page:
		49	; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
		50	; second half is for V86-to-linear translation.
		51	; Third and fourth are for I/O permission map.
		52	push 8000h ; blocks less than 8 pages are discontinuous
		53	call kernel_alloc
		54	test eax, eax
		55	jz .fail2
		56	mov [ebx+V86_machine.pagedir], eax
		57	push edi eax
		58	mov edi, eax
		59	add eax, 1800h
		60	mov [ebx+V86_machine.pages], eax
		61	; initialize tables
		62	mov ecx, 2000h/4
		63	xor eax, eax
		64	rep stosd
		65	mov [ebx+V86_machine.iopm], edi
		66	dec eax
		67	mov ecx, 2000h/4
		68	rep stosd
		69	pop eax
		70	; page directory: first entry is page table...
		71	mov edi, eax
		72	add eax, 1000h
		73	push eax
		74	call get_pg_addr
		75	or al, PG_UW
		76	stosd
		77	; ...and also copy system page tables
		78	; thx to Serge, system is located at high addresses
		79	add edi, (OS_BASE shr 20) - 4
		80	push esi
		81	mov esi, (OS_BASE shr 20) + sys_pgdir
		82	mov ecx, 0x80000000 shr 22
		83	rep movsd
		84
		85	mov eax, [ebx+V86_machine.pagedir] ;root dir also is
		86	call get_pg_addr ;used as page table
		87	or al, PG_SW
		88	mov [edi-4096+(page_tabs shr 20)], eax
		89
		90	pop esi
		91	; now V86 specific: initialize known addresses in first Mb
		92	pop eax
		93	; first page - BIOS data (shared between all machines!)
		94	; physical address = 0x2f0000
		95	; linear address = BOOT_VAR = OS_BASE + 0x2f0000
		96	mov dword [eax], (BOOT_VAR - OS_BASE) or 111b
		97	mov dword [eax+800h], BOOT_VAR
		98	; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
		99	; physical address = 0x9C000
		100	; linear address = 0x8009C000
		101	; (I have seen one computer with EBDA segment = 0x9D80,
		102	; all other computers use less memory)
		103	mov ecx, 4
		104	mov edx, 0x9C000
		105	push eax
		106	lea edi, [eax+0x9C*4]
		107	@@:
		108	lea eax, [edx + OS_BASE]
		109	mov [edi+800h], eax
		110	lea eax, [edx + 111b]
		111	stosd
		112	add edx, 0x1000
		113	loop @b
		114	pop eax
		115	pop edi
		116	; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
		117	; physical address = 0xC0000
		118	; linear address = 0x800C0000
		119	mov ecx, 0xC0
		120	@@:
		121	mov edx, ecx
		122	shl edx, 12
		123	push edx
		124	or edx, 111b
		125	mov [eax+ecx*4], edx
		126	pop edx
		127	add edx, OS_BASE
		128	mov [eax+ecx*4+0x800], edx
		129	inc cl
		130	jnz @b
		131	mov eax, ebx
		132	ret
		133	.fail2:
		134	mov eax, ebx
		135	call free
		136	.fail:
		137	xor eax, eax
		138	ret
		139
		140	; Destroy V86 machine
		141	; in: eax = handle
		142	; out: nothing
		143	; destroys: eax, ebx, ecx, edx (due to free)
		144	v86_destroy:
		145	push eax
		146	stdcall kernel_free, [eax+V86_machine.pagedir]
		147	pop eax
		148	jmp free
		149
		150	; Translate V86-address to linear address
		151	; in: eax=V86 address
		152	; esi=handle
		153	; out: eax=linear address
		154	; destroys: nothing
		155	v86_get_lin_addr:
		156	push ecx edx
		157	mov ecx, eax
		158	mov edx, [esi+V86_machine.pages]
		159	shr ecx, 12
		160	and eax, 0xFFF
		161	add eax, [edx+ecx*4] ; atomic operation, no mutex needed
		162	pop edx ecx
		163	ret
		164
		165	; Sets linear address for V86-page
		166	; in: eax=linear address (must be page-aligned)
		167	; ecx=V86 page (NOT address!)
		168	; esi=handle
		169	; out: nothing
		170	; destroys: nothing
		171	v86_set_page:
		172	push eax ebx
		173	mov ebx, [esi+V86_machine.pagedir]
		174	mov [ebx+ecx*4+0x1800], eax
		175	call get_pg_addr
		176	or al, 111b
		177	mov [ebx+ecx*4+0x1000], eax
		178	pop ebx eax
		179	ret
		180
		181	; Allocate memory in V86 machine
		182	; in: eax=size (in bytes)
		183	; esi=handle
		184	; out: eax=V86 address, para-aligned (0x10 multiple)
		185	; destroys: nothing
		186	; ��ᠭ�!!!
		187	;v86_alloc:
		188	; push ebx ecx edx edi
		189	; lea ebx, [esi+V86_machine.mutex]
		190	; call wait_mutex
		191	; add eax, 0x1F
		192	; shr eax, 4
		193	; mov ebx, 0x1000 ; start with address 0x1000 (second page)
		194	; mov edi, [esi+V86_machine.tables]
		195	;.l:
		196	; mov ecx, ebx
		197	; shr ecx, 12
		198	; mov edx, [edi+0x1000+ecx*4] ; get linear address
		199	; test edx, edx ; page allocated?
		200	; jz .unalloc
		201	; mov ecx, ebx
		202	; and ecx, 0xFFF
		203	; add edx, ecx
		204	; cmp dword [edx], 0 ; free block?
		205	; jnz .n
1198	clevermous	206	; cmp dword [edx+4],
1159	hidnplayr	207	; and [esi+V86_machine.mutex], 0
		208	; pop edi edx ecx ebx
		209	; ret
		210
		211	uglobal
		212	sys_v86_machine dd ?
		213	endg
		214
		215	; Called from kernel.asm at first stages of loading
		216	; Initialize system V86 machine (used to simulate BIOS int 13h)
		217	init_sys_v86:
		218	call v86_create
		219	mov [sys_v86_machine], eax
		220	test eax, eax
		221	jz .ret
		222	mov byte [BOOT_VAR + 0x500], 0xCD
		223	mov byte [BOOT_VAR + 0x501], 0x13
		224	mov byte [BOOT_VAR + 0x502], 0xF4
		225	mov byte [BOOT_VAR + 0x503], 0xCD
		226	mov byte [BOOT_VAR + 0x504], 0x10
		227	mov byte [BOOT_VAR + 0x505], 0xF4
		228	mov esi, eax
		229	mov ebx, [eax+V86_machine.pagedir]
		230	; one page for stack, two pages for results (0x2000 bytes = 16 sectors)
		231	mov dword [ebx+0x99*4+0x1000], 0x99000 or 111b
		232	mov dword [ebx+0x99*4+0x1800], OS_BASE + 0x99000
		233	mov dword [ebx+0x9A*4+0x1000], 0x9A000 or 111b
		234	mov dword [ebx+0x9A*4+0x1800], OS_BASE + 0x9A000
		235	mov dword [ebx+0x9B*4+0x1000], 0x9B000 or 111b
		236	mov dword [ebx+0x9B*4+0x1800], OS_BASE + 0x9B000
		237	if ~DEBUG_SHOW_IO
		238	; allow access to all ports
		239	mov ecx, [esi+V86_machine.iopm]
		240	xor eax, eax
		241	mov edi, ecx
		242	mov ecx, 10000h/8/4
		243	rep stosd
		244	end if
		245	.ret:
		246	ret
		247
		248	struc v86_regs
		249	{
		250	; don't change the order, it is important
		251	.edi dd ?
		252	.esi dd ?
		253	.ebp dd ?
		254	dd ? ; ignored
		255	.ebx dd ?
		256	.edx dd ?
		257	.ecx dd ?
		258	.eax dd ?
		259	.eip dd ?
		260	.cs dd ?
		261	.eflags dd ? ; VM flag must be set!
		262	.esp dd ?
		263	.ss dd ?
		264	.es dd ?
		265	.ds dd ?
		266	.fs dd ?
		267	.gs dd ?
		268	.size = $
		269	}
		270	virtual at 0
		271	v86_regs v86_regs
		272	end virtual
		273
		274	; Run V86 machine
		275	; in: ebx -> registers for V86 (two structures: in and out)
		276	; esi = handle
		277	; ecx = expected end address (CS:IP)
		278	; edx = IRQ to hook or -1 if not required
		279	; out: structure pointed to by ebx is filled with new values
		280	; eax = 1 - exception has occured, cl contains code
		281	; eax = 2 - access to disabled i/o port, ecx contains port address
		282	; eax = 3 - IRQ is already hooked by another VM
		283	; destroys: nothing
		284	v86_start:
		285	pushad
		286
		287	cli
		288
		289	mov ecx, [CURRENT_TASK]
		290	shl ecx, 8
		291	add ecx, SLOT_BASE
		292
		293	mov eax, [esi+V86_machine.iopm]
		294	call get_pg_addr
		295	inc eax
		296	push dword [ecx+APPDATA.io_map]
		297	push dword [ecx+APPDATA.io_map+4]
		298	mov dword [ecx+APPDATA.io_map], eax
		299	mov dword [page_tabs + (tss._io_map_0 shr 10)], eax
		300	add eax, 0x1000
		301	mov dword [ecx+APPDATA.io_map+4], eax
		302	mov dword [page_tabs + (tss._io_map_1 shr 10)], eax
		303
		304	push [ecx+APPDATA.dir_table]
		305	push [ecx+APPDATA.saved_esp0]
		306	mov [ecx+APPDATA.saved_esp0], esp
		307	mov [tss._esp0], esp
		308
		309	mov eax, [esi+V86_machine.pagedir]
		310	call get_pg_addr
		311	mov [ecx+APPDATA.dir_table], eax
		312	mov cr3, eax
		313
		314	; mov [irq_tab+5*4], my05
		315
		316	; We do not enable interrupts, because V86 IRQ redirector assumes that
		317	; machine is running
		318	; They will be enabled by IRET.
		319	; sti
		320
		321	mov eax, esi
		322	sub esp, v86_regs.size
		323	mov esi, ebx
		324	mov edi, esp
		325	mov ecx, v86_regs.size/4
		326	rep movsd
		327
		328	cmp edx, -1
		329	jz .noirqhook
		330	uglobal
		331	v86_irqhooks rd 16*2
		332	endg
		333	cmp [v86_irqhooks+edx*8], 0
		334	jz @f
		335	cmp [v86_irqhooks+edx*8], eax
		336	jz @f
		337	mov esi, v86_irqerr
		338	call sys_msg_board_str
		339	inc [v86_irqhooks+edx*8+4]
		340	mov eax, 3
		341	jmp v86_exc_c.exit
		342	@@:
		343	mov [v86_irqhooks+edx*8], eax
		344	inc [v86_irqhooks+edx*8+4]
		345	.noirqhook:
		346
		347	popad
		348	iretd
		349
		350	; It is only possible to leave virtual-8086 mode by faulting to
		351	; a protected-mode interrupt handler (typically the general-protection
		352	; exception handler, which in turn calls the virtual 8086-mode monitor).
		353
		354	iglobal
1198	clevermous	355	v86_exc_str1 db 'V86 : unexpected exception ',0
		356	v86_exc_str2 db ' at ',0
		357	v86_exc_str3 db ':',0
		358	v86_exc_str4 db 13,10,'V86 : faulted code:',0
		359	v86_exc_str5 db ' (unavailable)',0
		360	v86_newline db 13,10,0
		361	v86_io_str1 db 'V86 : access to disabled i/o port ',0
		362	v86_io_byte db ' (byte)',13,10,0
		363	v86_io_word db ' (word)',13,10,0
		364	v86_io_dword db ' (dword)',13,10,0
		365	v86_irqerr db 'V86 : IRQ already hooked',13,10,0
1159	hidnplayr	366	endg
		367
		368	v86_exc_c:
		369	; Did we all that we have wanted to do?
1198	clevermous	370	cmp bl,1
		371	jne @f
		372	xor eax, eax
		373	mov dr6, eax
		374	@@: mov eax, [esp+v86_regs.size+10h+18h]
1159	hidnplayr	375	cmp word [esp+v86_regs.eip], ax
		376	jnz @f
		377	shr eax, 16
		378	cmp word [esp+v86_regs.cs], ax
		379	jz .done
		380	@@:
		381	; Various system events, which must be handled, result in #GP
		382	cmp bl, 13
		383	jnz .nogp
		384	; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error
		385	cmp word [esp+v86_regs.eip+2], 0
		386	jnz .nogp
		387	; Otherwise we can safely access byte at CS:IP
		388	; (because it is #GP, not #PF handler)
		389	; �᫨ �� 嫮�� ᪫�祭�� ⮫쪮 ��-�� ⥭�� ⮢ ��,
		390	; �� 㦥 �嫮��⠫� � �� 뫮 �� #GP
		391	movzx esi, word [esp+v86_regs.cs]
		392	shl esi, 4
		393	add esi, [esp+v86_regs.eip]
		394	lodsb
		395	cmp al, 0xCD ; int xx command = CD xx
		396	jz .handle_int
		397	cmp al, 0xCF
		398	jz .handle_iret
		399	cmp al, 0xF3
		400	jz .handle_rep
		401	cmp al, 0xEC
		402	jz .handle_in
		403	cmp al, 0xED
		404	jz .handle_in_word
		405	cmp al, 0xEE
		406	jz .handle_out
		407	cmp al, 0xEF
		408	jz .handle_out_word
		409	cmp al, 0xE4
		410	jz .handle_in_imm
		411	cmp al, 0xE6
		412	jz .handle_out_imm
		413	cmp al, 0x9C
		414	jz .handle_pushf
		415	cmp al, 0x9D
		416	jz .handle_popf
		417	cmp al, 0xFA
		418	jz .handle_cli
		419	cmp al, 0xFB
		420	jz .handle_sti
		421	cmp al, 0x66
		422	jz .handle_66
		423	jmp .nogp
		424	.handle_int:
		425	cmp word [esp+v86_regs.eip], 0xFFFF
		426	jae .nogp
		427	xor eax, eax
		428	lodsb
		429	; call sys_msg_board_byte
		430	; simulate INT command
		431	; N.B. It is possible that some checks need to be corrected,
		432	; but at least in case of normal execution the code works.
		433	.simulate_int:
		434	cmp word [esp+v86_regs.esp], 6
		435	jae @f
		436	mov bl, 12 ; #SS exception
		437	jmp .nogp
		438	@@:
		439	movzx edx, word [esp+v86_regs.ss]
		440	shl edx, 4
		441	push eax
		442	movzx eax, word [esp+4+v86_regs.esp]
		443	sub eax, 6
		444	add edx, eax
		445	mov eax, edx
		446	mov esi, [esp+4+v86_regs.size+10h+4]
		447	call v86_get_lin_addr
		448	cmp eax, 0x1000
		449	jae @f
		450	mov bl, 14 ; #PF exception
		451	jmp .nogp
		452	@@:
		453	lea eax, [edx+5]
		454	call v86_get_lin_addr
		455	cmp eax, 0x1000
		456	jae @f
		457	mov bl, 14 ; #PF exception
		458	jmp .nogp
		459	@@:
		460	sub word [esp+4+v86_regs.esp], 6
		461	mov eax, [esp+4+v86_regs.eip]
		462	cmp byte [esp+1], 0
		463	jnz @f
		464	inc eax
		465	inc eax
		466	@@:
		467	mov word [edx], ax
		468	mov eax, [esp+4+v86_regs.cs]
		469	mov word [edx+2], ax
		470	mov eax, [esp+4+v86_regs.eflags]
		471	mov word [edx+4], ax
		472	pop eax
		473	mov ah, 0
		474	mov cx, [eax*4]
		475	mov word [esp+v86_regs.eip], cx
		476	mov cx, [eax*4+2]
		477	mov word [esp+v86_regs.cs], cx
		478	; note that interrupts will be disabled globally at IRET
		479	and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags
		480	; continue V86 execution
		481	popad
		482	iretd
		483	.handle_iret:
		484	cmp word [esp+v86_regs.esp], 0x10000 - 6
		485	jbe @f
		486	mov bl, 12
		487	jmp .nogp
		488	@@:
		489	movzx edx, word [esp+v86_regs.ss]
		490	shl edx, 4
		491	movzx eax, word [esp+v86_regs.esp]
		492	add edx, eax
		493	mov eax, edx
		494	mov esi, [esp+v86_regs.size+10h+4]
		495	call v86_get_lin_addr
		496	cmp eax, 0x1000
		497	jae @f
		498	mov bl, 14
		499	jmp .nogp
		500	@@:
		501	lea eax, [edx+5]
		502	call v86_get_lin_addr
		503	cmp eax, 0x1000
		504	jae @f
		505	mov bl, 14
		506	jmp .nogp
		507	@@:
		508	mov ax, [edx]
		509	mov word [esp+v86_regs.eip], ax
		510	mov ax, [edx+2]
		511	mov word [esp+v86_regs.cs], ax
		512	mov ax, [edx+4]
		513	mov word [esp+v86_regs.eflags], ax
		514	add word [esp+v86_regs.esp], 6
		515	popad
		516	iretd
		517	.handle_pushf:
		518	cmp word [esp+v86_regs.esp], 1
		519	jnz @f
		520	mov bl, 12
		521	jmp .nogp
		522	@@:
		523	movzx edx, word [esp+v86_regs.ss]
		524	shl edx, 4
		525	mov eax, [esp+v86_regs.esp]
		526	sub eax, 2
		527	movzx eax, ax
		528	add edx, eax
		529	mov eax, edx
		530	mov esi, [esp+v86_regs.size+10h+4]
		531	call v86_get_lin_addr
		532	cmp eax, 0x1000
		533	jae @f
		534	mov bl, 14 ; #PF exception
		535	jmp .nogp
		536	@@:
		537	lea eax, [edx+1]
		538	call v86_get_lin_addr
		539	cmp eax, 0x1000
		540	jae @f
		541	mov bl, 14
		542	jmp .nogp
		543	@@:
		544	sub word [esp+v86_regs.esp], 2
		545	mov eax, [esp+v86_regs.eflags]
		546	mov [edx], ax
		547	inc word [esp+v86_regs.eip]
		548	popad
		549	iretd
		550	.handle_pushfd:
		551	cmp word [esp+v86_regs.esp], 4
		552	jae @f
		553	mov bl, 12 ; #SS exception
		554	jmp .nogp
		555	@@:
		556	movzx edx, word [esp+v86_regs.ss]
		557	shl edx, 4
		558	movzx eax, word [esp+v86_regs.esp]
		559	sub eax, 4
		560	add edx, eax
		561	mov eax, edx
		562	mov esi, [esp+v86_regs.size+10h+4]
		563	call v86_get_lin_addr
		564	cmp eax, 0x1000
		565	jae @f
		566	mov bl, 14 ; #PF exception
		567	jmp .nogp
		568	@@:
		569	lea eax, [edx+3]
		570	call v86_get_lin_addr
		571	cmp eax, 0x1000
		572	jae @f
		573	mov bl, 14 ; #PF exception
		574	jmp .nogp
		575	@@:
		576	sub word [esp+v86_regs.esp], 4
		577	movzx eax, word [esp+v86_regs.eflags]
		578	mov [edx], eax
		579	add word [esp+v86_regs.eip], 2
		580	popad
		581	iretd
		582	.handle_popf:
		583	cmp word [esp+v86_regs.esp], 0xFFFF
		584	jnz @f
		585	mov bl, 12
		586	jmp .nogp
		587	@@:
		588	movzx edx, word [esp+v86_regs.ss]
		589	shl edx, 4
		590	movzx eax, word [esp+v86_regs.esp]
		591	add edx, eax
		592	mov eax, edx
		593	mov esi, [esp+v86_regs.size+10h+4]
		594	call v86_get_lin_addr
		595	cmp eax, 0x1000
		596	jae @f
		597	mov bl, 14 ; #PF exception
		598	jmp .nogp
		599	@@:
		600	lea eax, [edx+1]
		601	call v86_get_lin_addr
		602	cmp eax, 0x1000
		603	jae @f
		604	mov bl, 14
		605	jmp .nogp
		606	@@:
		607	mov ax, [edx]
		608	mov word [esp+v86_regs.eflags], ax
		609	add word [esp+v86_regs.esp], 2
		610	inc word [esp+v86_regs.eip]
		611	popad
		612	iretd
		613	.handle_popfd:
		614	cmp word [esp+v86_regs.esp], 0x10000 - 4
		615	jbe @f
		616	mov bl, 12
		617	jmp .nogp
		618	@@:
		619	movzx edx, word [esp+v86_regs.ss]
		620	shl edx, 4
		621	movzx eax, word [esp+v86_regs.esp]
		622	add edx, eax
		623	mov eax, edx
		624	mov esi, [esp+v86_regs.size+10h+4]
		625	call v86_get_lin_addr
		626	cmp eax, 0x1000
		627	jae @f
		628	mov bl, 14
		629	jmp .nogp
		630	@@:
		631	lea eax, [edx+3]
		632	call v86_get_lin_addr
		633	cmp eax, 0x1000
		634	jae @f
		635	mov bl, 14
		636	jmp .nogp
		637	@@:
		638	mov eax, [edx]
		639	mov word [esp+v86_regs.eflags], ax
		640	add word [esp+v86_regs.esp], 4
		641	add word [esp+v86_regs.eip], 2
		642	popad
		643	iretd
		644	.handle_cli:
		645	and byte [esp+v86_regs.eflags+1], not 2
		646	inc word [esp+v86_regs.eip]
		647	popad
		648	iretd
		649	.handle_sti:
		650	or byte [esp+v86_regs.eflags+1], 2
		651	inc word [esp+v86_regs.eip]
		652	popad
		653	iretd
		654	.handle_rep:
		655	cmp word [esp+v86_regs.eip], 0xFFFF
		656	jae .nogp
		657	lodsb
		658	cmp al, 6Eh
		659	jz .handle_rep_outsb
		660	jmp .nogp
		661	.handle_rep_outsb:
		662	.handle_in:
		663	.handle_out:
		664	.invalid_io_byte:
		665	movzx ebx, word [esp+v86_regs.edx]
		666	mov ecx, 1
		667	jmp .invalid_io
		668	.handle_in_imm:
		669	.handle_out_imm:
		670	cmp word [esp+v86_regs.eip], 0xFFFF
		671	jae .nogp
		672	lodsb
		673	movzx ebx, al
		674	mov ecx, 1
		675	jmp .invalid_io
		676	.handle_66:
		677	cmp word [esp+v86_regs.eip], 0xFFFF
		678	jae .nogp
		679	lodsb
		680	cmp al, 0x9C
		681	jz .handle_pushfd
		682	cmp al, 0x9D
		683	jz .handle_popfd
		684	cmp al, 0xEF
		685	jz .handle_out_dword
		686	cmp al, 0xED
		687	jz .handle_in_dword
		688	jmp .nogp
		689	.handle_in_word:
		690	.handle_out_word:
		691	movzx ebx, word [esp+v86_regs.edx]
		692	mov ecx, 2
		693	jmp .invalid_io
		694	.handle_in_dword:
		695	.handle_out_dword:
		696	.invalid_io_dword:
		697	movzx ebx, word [esp+v86_regs.edx]
		698	mov ecx, 4
		699	.invalid_io:
		700	mov esi, v86_io_str1
		701	call sys_msg_board_str
		702	mov eax, ebx
		703	call sys_msg_board_dword
		704	mov esi, v86_io_byte
		705	cmp ecx, 1
		706	jz @f
		707	mov esi, v86_io_word
		708	cmp ecx, 2
		709	jz @f
		710	mov esi, v86_io_dword
		711	@@:
		712	call sys_msg_board_str
		713	if DEBUG_SHOW_IO
		714	mov edx, ebx
		715	mov ebx, 200
		716	call delay_hs
		717	mov esi, [esp+v86_regs.size+10h+4]
		718	mov eax, [esi+V86_machine.iopm]
		719	@@:
		720	btr [eax], edx
		721	inc edx
		722	loop @b
		723	popad
		724	iretd
		725	else
		726	mov eax, 2
		727	jmp .exit
		728	end if
		729	.nogp:
		730
		731	mov esi, v86_exc_str1
		732	call sys_msg_board_str
		733	mov al, bl
		734	call sys_msg_board_byte
		735	mov esi, v86_exc_str2
		736	call sys_msg_board_str
		737	mov ax, [esp+32+4]
		738	call sys_msg_board_word
		739	mov esi, v86_exc_str3
		740	call sys_msg_board_str
		741	mov ax, [esp+32]
		742	call sys_msg_board_word
		743	mov esi, v86_exc_str4
		744	call sys_msg_board_str
		745	mov ecx, 8
		746	movzx edx, word [esp+32+4]
		747	shl edx, 4
		748	add edx, [esp+32]
		749	@@:
		750	mov esi, [esp+v86_regs.size+10h+4]
		751	mov eax, edx
		752	call v86_get_lin_addr
		753	cmp eax, 0x1000
		754	jb .nopage
		755	mov esi, v86_exc_str3-2
		756	call sys_msg_board_str
		757	mov al, [edx]
		758	call sys_msg_board_byte
		759	inc edx
		760	loop @b
		761	jmp @f
		762	.nopage:
		763	mov esi, v86_exc_str5
		764	call sys_msg_board_str
		765	@@:
		766	mov esi, v86_newline
		767	call sys_msg_board_str
		768	mov eax, 1
		769	jmp .exit
		770
		771	.done:
		772	xor eax, eax
		773
		774	.exit:
		775	mov [esp+v86_regs.size+10h+1Ch], eax
		776	mov [esp+v86_regs.size+10h+18h], ebx
		777
		778	mov edx, [esp+v86_regs.size+10h+14h]
		779	cmp edx, -1
		780	jz @f
		781	dec [v86_irqhooks+edx*8+4]
		782	jnz @f
		783	and [v86_irqhooks+edx*8], 0
		784	@@:
		785
		786	mov esi, esp
		787	mov edi, [esi+v86_regs.size+10h+10h]
		788	add edi, v86_regs.size
		789	mov ecx, v86_regs.size/4
		790	rep movsd
		791	mov esp, esi
		792
		793	cli
		794	mov ecx, [CURRENT_TASK]
		795	shl ecx, 8
		796	pop eax
		797	mov [SLOT_BASE+ecx+APPDATA.saved_esp0], eax
		798	mov [tss._esp0], eax
		799	pop eax
		800	mov [SLOT_BASE+ecx+APPDATA.dir_table], eax
		801	pop ebx
		802	mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx
		803	mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx
		804	pop ebx
		805	mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx
		806	mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx
		807	mov cr3, eax
		808	; mov [irq_tab+5*4], 0
		809	sti
		810
		811	popad
		812	ret
		813
		814	;my05:
		815	; mov dx, 30C2h
		816	; mov cx, 4
		817	;.0:
		818	; in al, dx
		819	; cmp al, 0FFh
		820	; jz @f
		821	; test al, 4
		822	; jnz .1
		823	;@@:
		824	; add dx, 8
		825	; in al, dx
		826	; cmp al, 0FFh
		827	; jz @f
		828	; test al, 4
		829	; jnz .1
		830	;@@:
		831	; loop .0
		832	; ret
		833	;.1:
		834	; or al, 84h
		835	; out dx, al
		836	;.2:
		837	; mov dx, 30F7h
		838	; in al, dx
		839	; mov byte [BOOT_VAR + 48Eh], 0FFh
		840	; ret
		841
		842	v86_irq:
		843	; push irq/pushad/jmp v86_irq
		844	; eax = irq
		845	lea esi, [esp+1Ch]
		846	lea edi, [esi+4]
		847	mov ecx, 8
		848	std
		849	rep movsd
		850	cld
		851	mov edi, eax
		852	pop eax
		853	v86_irq2:
		854	mov esi, [v86_irqhooks+edi*8] ; get VM handle
		855	mov eax, [esi+V86_machine.pagedir]
		856	call get_pg_addr
		857	mov ecx, [CURRENT_TASK]
		858	shl ecx, 8
		859	cmp [SLOT_BASE+ecx+APPDATA.dir_table], eax
		860	jnz .notcurrent
		861	lea eax, [edi+8]
		862	cmp al, 10h
		863	mov ah, 1
		864	jb @f
		865	add al, 60h
		866	@@:
		867	jmp v86_exc_c.simulate_int
		868	.notcurrent:
		869	mov ebx, SLOT_BASE + 0x100
		870	mov ecx, [TASK_COUNT]
		871	.scan:
		872	cmp [ebx+APPDATA.dir_table], eax
		873	jnz .cont
		874	push ecx
		875	mov ecx, [ebx+APPDATA.saved_esp0]
		876	cmp word [ecx-v86_regs.size+v86_regs.esp], 6
		877	jb .cont2
		878	movzx edx, word [ecx-v86_regs.size+v86_regs.ss]
		879	shl edx, 4
		880	push eax
		881	movzx eax, word [ecx-v86_regs.size+v86_regs.esp]
		882	sub eax, 6
		883	add edx, eax
		884	mov eax, edx
		885	call v86_get_lin_addr
		886	cmp eax, 0x1000
		887	jb .cont3
		888	lea eax, [edx+5]
		889	call v86_get_lin_addr
		890	cmp eax, 0x1000
		891	jb .cont3
		892	pop eax
		893	pop ecx
		894	jmp .found
		895	.cont3:
		896	pop eax
		897	.cont2:
		898	pop ecx
		899	.cont:
		900	loop .scan
		901	mov al, 20h
		902	out 20h, al
		903	cmp edi, 8
		904	jb @f
		905	out 0A0h, al
		906	@@:
		907	popad
		908	iretd
		909	.found:
		910	mov cr3, eax
		911	sub word [esi-v86_regs.size+v86_regs.esp], 6
		912	mov ecx, [esi-v86_regs.size+v86_regs.eip]
		913	mov word [edx], cx
		914	mov ecx, [esi-v86_regs.size+v86_regs.cs]
		915	mov word [edx+2], cx
		916	mov ecx, [esi-v86_regs.size+v86_regs.eflags]
		917	mov word [edx+4], cx
		918	lea eax, [edi+8]
		919	cmp al, 10h
		920	jb @f
		921	add al, 60h
		922	@@:
		923	mov cx, [eax*4]
		924	mov word [esi-v86_regs.size+v86_regs.eip], cx
		925	mov cx, [eax*4+2]
		926	mov word [esi-v86_regs.size+v86_regs.cs], cx
		927	and byte [esi-v86_regs.size+v86_regs.eflags+1], not 3
		928	call update_counters
1198	clevermous	929	lea edi, [ebx + 0x100000000 - SLOT_BASE]
		930	shr edi, 3
		931	add edi, TASK_DATA
		932	call find_next_task.found
1159	hidnplayr	933	call do_change_task
		934	popad
		935	iretd

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(root)/kernel/branches/net/core/v86.inc – Rev 1206