WebSVN – Kolibri OS – Blame – /kernel/trunk/core/v86.inc

Rev	Author	Line No.	Line
2288	clevermous	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
		8	$Revision: 2288 $
		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 = 0
		95	; linear address = OS_BASE
		96	mov dword [eax], 111b
		97	mov dword [eax+800h], OS_BASE
		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
		206	; cmp dword [edx+4],
		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 [OS_BASE + 0x500], 0xCD
		223	mov byte [OS_BASE + 0x501], 0x13
		224	mov byte [OS_BASE + 0x502], 0xF4
		225	mov byte [OS_BASE + 0x503], 0xCD
		226	mov byte [OS_BASE + 0x504], 0x10
		227	mov byte [OS_BASE + 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 IRQ_RESERVED * 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
		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
		366	endg
		367
		368	v86_exc_c:
		369	; Did we all that we have wanted to do?
		370	cmp bl, 1
		371	jne @f
		372	xor eax, eax
		373	mov dr6, eax
		374	@@:
		375	mov eax, [esp+v86_regs.size+10h+18h]
		376	cmp word [esp+v86_regs.eip], ax
		377	jnz @f
		378	shr eax, 16
		379	cmp word [esp+v86_regs.cs], ax
		380	jz .done
		381	@@:
		382	; Various system events, which must be handled, result in #GP
		383	cmp bl, 13
		384	jnz .nogp
		385	; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error
		386	cmp word [esp+v86_regs.eip+2], 0
		387	jnz .nogp
		388	; Otherwise we can safely access byte at CS:IP
		389	; (because it is #GP, not #PF handler)
		390	; �᫨ �� 嫮�� ᪫�祭�� ⮫쪮 ��-�� ⥭�� ⮢ ��,
		391	; �� 㦥 �嫮��⠫� � �� 뫮 �� #GP
		392	movzx esi, word [esp+v86_regs.cs]
		393	shl esi, 4
		394	add esi, [esp+v86_regs.eip]
		395	lodsb
		396	cmp al, 0xCD ; int xx command = CD xx
		397	jz .handle_int
		398	cmp al, 0xCF
		399	jz .handle_iret
		400	cmp al, 0xF3
		401	jz .handle_rep
		402	cmp al, 0xEC
		403	jz .handle_in
		404	cmp al, 0xED
		405	jz .handle_in_word
		406	cmp al, 0xEE
		407	jz .handle_out
		408	cmp al, 0xEF
		409	jz .handle_out_word
		410	cmp al, 0xE4
		411	jz .handle_in_imm
		412	cmp al, 0xE6
		413	jz .handle_out_imm
		414	cmp al, 0x9C
		415	jz .handle_pushf
		416	cmp al, 0x9D
		417	jz .handle_popf
		418	cmp al, 0xFA
		419	jz .handle_cli
		420	cmp al, 0xFB
		421	jz .handle_sti
		422	cmp al, 0x66
		423	jz .handle_66
		424	jmp .nogp
		425	.handle_int:
		426	cmp word [esp+v86_regs.eip], 0xFFFF
		427	jae .nogp
		428	xor eax, eax
		429	lodsb
		430	; call sys_msg_board_byte
		431	; simulate INT command
		432	; N.B. It is possible that some checks need to be corrected,
		433	; but at least in case of normal execution the code works.
		434	.simulate_int:
		435	cmp word [esp+v86_regs.esp], 6
		436	jae @f
		437	mov bl, 12 ; #SS exception
		438	jmp .nogp
		439	@@:
		440	movzx edx, word [esp+v86_regs.ss]
		441	shl edx, 4
		442	push eax
		443	movzx eax, word [esp+4+v86_regs.esp]
		444	sub eax, 6
		445	add edx, eax
		446	mov eax, edx
		447	mov esi, [esp+4+v86_regs.size+10h+4]
		448	call v86_get_lin_addr
		449	cmp eax, 0x1000
		450	jae @f
		451	mov bl, 14 ; #PF exception
		452	jmp .nogp
		453	@@:
		454	lea eax, [edx+5]
		455	call v86_get_lin_addr
		456	cmp eax, 0x1000
		457	jae @f
		458	mov bl, 14 ; #PF exception
		459	jmp .nogp
		460	@@:
		461	sub word [esp+4+v86_regs.esp], 6
		462	mov eax, [esp+4+v86_regs.eip]
		463	cmp byte [esp+1], 0
		464	jnz @f
		465	inc eax
		466	inc eax
		467	@@:
		468	mov word [edx], ax
		469	mov eax, [esp+4+v86_regs.cs]
		470	mov word [edx+2], ax
		471	mov eax, [esp+4+v86_regs.eflags]
		472	mov word [edx+4], ax
		473	pop eax
		474	mov ah, 0
		475	mov cx, [eax*4]
		476	mov word [esp+v86_regs.eip], cx
		477	mov cx, [eax*4+2]
		478	mov word [esp+v86_regs.cs], cx
		479	; note that interrupts will be disabled globally at IRET
		480	and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags
		481	; continue V86 execution
		482	popad
		483	iretd
		484	.handle_iret:
		485	cmp word [esp+v86_regs.esp], 0x10000 - 6
		486	jbe @f
		487	mov bl, 12
		488	jmp .nogp
		489	@@:
		490	movzx edx, word [esp+v86_regs.ss]
		491	shl edx, 4
		492	movzx eax, word [esp+v86_regs.esp]
		493	add edx, eax
		494	mov eax, edx
		495	mov esi, [esp+v86_regs.size+10h+4]
		496	call v86_get_lin_addr
		497	cmp eax, 0x1000
		498	jae @f
		499	mov bl, 14
		500	jmp .nogp
		501	@@:
		502	lea eax, [edx+5]
		503	call v86_get_lin_addr
		504	cmp eax, 0x1000
		505	jae @f
		506	mov bl, 14
		507	jmp .nogp
		508	@@:
		509	mov ax, [edx]
		510	mov word [esp+v86_regs.eip], ax
		511	mov ax, [edx+2]
		512	mov word [esp+v86_regs.cs], ax
		513	mov ax, [edx+4]
		514	mov word [esp+v86_regs.eflags], ax
		515	add word [esp+v86_regs.esp], 6
		516	popad
		517	iretd
		518	.handle_pushf:
		519	cmp word [esp+v86_regs.esp], 1
		520	jnz @f
		521	mov bl, 12
		522	jmp .nogp
		523	@@:
		524	movzx edx, word [esp+v86_regs.ss]
		525	shl edx, 4
		526	mov eax, [esp+v86_regs.esp]
		527	sub eax, 2
		528	movzx eax, ax
		529	add edx, eax
		530	mov eax, edx
		531	mov esi, [esp+v86_regs.size+10h+4]
		532	call v86_get_lin_addr
		533	cmp eax, 0x1000
		534	jae @f
		535	mov bl, 14 ; #PF exception
		536	jmp .nogp
		537	@@:
		538	lea eax, [edx+1]
		539	call v86_get_lin_addr
		540	cmp eax, 0x1000
		541	jae @f
		542	mov bl, 14
		543	jmp .nogp
		544	@@:
		545	sub word [esp+v86_regs.esp], 2
		546	mov eax, [esp+v86_regs.eflags]
		547	mov [edx], ax
		548	inc word [esp+v86_regs.eip]
		549	popad
		550	iretd
		551	.handle_pushfd:
		552	cmp word [esp+v86_regs.esp], 4
		553	jae @f
		554	mov bl, 12 ; #SS exception
		555	jmp .nogp
		556	@@:
		557	movzx edx, word [esp+v86_regs.ss]
		558	shl edx, 4
		559	movzx eax, word [esp+v86_regs.esp]
		560	sub eax, 4
		561	add edx, eax
		562	mov eax, edx
		563	mov esi, [esp+v86_regs.size+10h+4]
		564	call v86_get_lin_addr
		565	cmp eax, 0x1000
		566	jae @f
		567	mov bl, 14 ; #PF exception
		568	jmp .nogp
		569	@@:
		570	lea eax, [edx+3]
		571	call v86_get_lin_addr
		572	cmp eax, 0x1000
		573	jae @f
		574	mov bl, 14 ; #PF exception
		575	jmp .nogp
		576	@@:
		577	sub word [esp+v86_regs.esp], 4
		578	movzx eax, word [esp+v86_regs.eflags]
		579	mov [edx], eax
		580	add word [esp+v86_regs.eip], 2
		581	popad
		582	iretd
		583	.handle_popf:
		584	cmp word [esp+v86_regs.esp], 0xFFFF
		585	jnz @f
		586	mov bl, 12
		587	jmp .nogp
		588	@@:
		589	movzx edx, word [esp+v86_regs.ss]
		590	shl edx, 4
		591	movzx eax, word [esp+v86_regs.esp]
		592	add edx, eax
		593	mov eax, edx
		594	mov esi, [esp+v86_regs.size+10h+4]
		595	call v86_get_lin_addr
		596	cmp eax, 0x1000
		597	jae @f
		598	mov bl, 14 ; #PF exception
		599	jmp .nogp
		600	@@:
		601	lea eax, [edx+1]
		602	call v86_get_lin_addr
		603	cmp eax, 0x1000
		604	jae @f
		605	mov bl, 14
		606	jmp .nogp
		607	@@:
		608	mov ax, [edx]
		609	mov word [esp+v86_regs.eflags], ax
		610	add word [esp+v86_regs.esp], 2
		611	inc word [esp+v86_regs.eip]
		612	popad
		613	iretd
		614	.handle_popfd:
		615	cmp word [esp+v86_regs.esp], 0x10000 - 4
		616	jbe @f
		617	mov bl, 12
		618	jmp .nogp
		619	@@:
		620	movzx edx, word [esp+v86_regs.ss]
		621	shl edx, 4
		622	movzx eax, word [esp+v86_regs.esp]
		623	add edx, eax
		624	mov eax, edx
		625	mov esi, [esp+v86_regs.size+10h+4]
		626	call v86_get_lin_addr
		627	cmp eax, 0x1000
		628	jae @f
		629	mov bl, 14
		630	jmp .nogp
		631	@@:
		632	lea eax, [edx+3]
		633	call v86_get_lin_addr
		634	cmp eax, 0x1000
		635	jae @f
		636	mov bl, 14
		637	jmp .nogp
		638	@@:
		639	mov eax, [edx]
		640	mov word [esp+v86_regs.eflags], ax
		641	add word [esp+v86_regs.esp], 4
		642	add word [esp+v86_regs.eip], 2
		643	popad
		644	iretd
		645	.handle_cli:
		646	and byte [esp+v86_regs.eflags+1], not 2
		647	inc word [esp+v86_regs.eip]
		648	popad
		649	iretd
		650	.handle_sti:
		651	or byte [esp+v86_regs.eflags+1], 2
		652	inc word [esp+v86_regs.eip]
		653	popad
		654	iretd
		655	.handle_rep:
		656	cmp word [esp+v86_regs.eip], 0xFFFF
		657	jae .nogp
		658	lodsb
		659	cmp al, 6Eh
		660	jz .handle_rep_outsb
		661	jmp .nogp
		662	.handle_rep_outsb:
		663	.handle_in:
		664	.handle_out:
		665	.invalid_io_byte:
		666	movzx ebx, word [esp+v86_regs.edx]
		667	mov ecx, 1
		668	jmp .invalid_io
		669	.handle_in_imm:
		670	.handle_out_imm:
		671	cmp word [esp+v86_regs.eip], 0xFFFF
		672	jae .nogp
		673	lodsb
		674	movzx ebx, al
		675	mov ecx, 1
		676	jmp .invalid_io
		677	.handle_66:
		678	cmp word [esp+v86_regs.eip], 0xFFFF
		679	jae .nogp
		680	lodsb
		681	cmp al, 0x9C
		682	jz .handle_pushfd
		683	cmp al, 0x9D
		684	jz .handle_popfd
		685	cmp al, 0xEF
		686	jz .handle_out_dword
		687	cmp al, 0xED
		688	jz .handle_in_dword
		689	jmp .nogp
		690	.handle_in_word:
		691	.handle_out_word:
		692	movzx ebx, word [esp+v86_regs.edx]
		693	mov ecx, 2
		694	jmp .invalid_io
		695	.handle_in_dword:
		696	.handle_out_dword:
		697	.invalid_io_dword:
		698	movzx ebx, word [esp+v86_regs.edx]
		699	mov ecx, 4
		700	.invalid_io:
		701	mov esi, v86_io_str1
		702	call sys_msg_board_str
		703	mov eax, ebx
		704	call sys_msg_board_dword
		705	mov esi, v86_io_byte
		706	cmp ecx, 1
		707	jz @f
		708	mov esi, v86_io_word
		709	cmp ecx, 2
		710	jz @f
		711	mov esi, v86_io_dword
		712	@@:
		713	call sys_msg_board_str
		714	if DEBUG_SHOW_IO
		715	mov edx, ebx
		716	mov ebx, 200
		717	call delay_hs
		718	mov esi, [esp+v86_regs.size+10h+4]
		719	mov eax, [esi+V86_machine.iopm]
		720	@@:
		721	btr [eax], edx
		722	inc edx
		723	loop @b
		724	popad
		725	iretd
		726	else
		727	mov eax, 2
		728	jmp .exit
		729	end if
		730	.nogp:
		731
		732	mov esi, v86_exc_str1
		733	call sys_msg_board_str
		734	mov al, bl
		735	call sys_msg_board_byte
		736	mov esi, v86_exc_str2
		737	call sys_msg_board_str
		738	mov ax, [esp+32+4]
		739	call sys_msg_board_word
		740	mov esi, v86_exc_str3
		741	call sys_msg_board_str
		742	mov ax, [esp+32]
		743	call sys_msg_board_word
		744	mov esi, v86_exc_str4
		745	call sys_msg_board_str
		746	mov ecx, 8
		747	movzx edx, word [esp+32+4]
		748	shl edx, 4
		749	add edx, [esp+32]
		750	@@:
		751	mov esi, [esp+v86_regs.size+10h+4]
		752	mov eax, edx
		753	call v86_get_lin_addr
		754	cmp eax, 0x1000
		755	jb .nopage
		756	mov esi, v86_exc_str3-2
		757	call sys_msg_board_str
		758	mov al, [edx]
		759	call sys_msg_board_byte
		760	inc edx
		761	loop @b
		762	jmp @f
		763	.nopage:
		764	mov esi, v86_exc_str5
		765	call sys_msg_board_str
		766	@@:
		767	mov esi, v86_newline
		768	call sys_msg_board_str
		769	mov eax, 1
		770	jmp .exit
		771
		772	.done:
		773	xor eax, eax
		774
		775	.exit:
		776	mov [esp+v86_regs.size+10h+1Ch], eax
		777	mov [esp+v86_regs.size+10h+18h], ebx
		778
		779	mov edx, [esp+v86_regs.size+10h+14h]
		780	cmp edx, -1
		781	jz @f
		782	dec [v86_irqhooks+edx*8+4]
		783	jnz @f
		784	and [v86_irqhooks+edx*8], 0
		785	@@:
		786
		787	mov esi, esp
		788	mov edi, [esi+v86_regs.size+10h+10h]
		789	add edi, v86_regs.size
		790	mov ecx, v86_regs.size/4
		791	rep movsd
		792	mov esp, esi
		793
		794	cli
		795	mov ecx, [CURRENT_TASK]
		796	shl ecx, 8
		797	pop eax
		798	mov [SLOT_BASE+ecx+APPDATA.saved_esp0], eax
		799	mov [tss._esp0], eax
		800	pop eax
		801	mov [SLOT_BASE+ecx+APPDATA.dir_table], eax
		802	pop ebx
		803	mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx
		804	mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx
		805	pop ebx
		806	mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx
		807	mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx
		808	mov cr3, eax
		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	align 4
		843	v86_irq:
		844	; push irq/pushad/jmp v86_irq
		845	; ebp = irq
		846	lea esi, [esp+1Ch]
		847	lea edi, [esi+4]
		848	mov ecx, 8
		849	std
		850	rep movsd
		851	cld
		852	mov edi, ebp
		853	pop eax
		854	v86_irq2:
		855	mov esi, [v86_irqhooks+edi*8] ; get VM handle
		856	mov eax, [esi+V86_machine.pagedir]
		857	call get_pg_addr
		858	mov ecx, [CURRENT_TASK]
		859	shl ecx, 8
		860	cmp [SLOT_BASE+ecx+APPDATA.dir_table], eax
		861	jnz .notcurrent
		862	lea eax, [edi+8]
		863	cmp al, 10h
		864	mov ah, 1
		865	jb @f
		866	add al, 60h
		867	@@:
		868	jmp v86_exc_c.simulate_int
		869	.notcurrent:
		870	mov ebx, SLOT_BASE + 0x100
		871	mov ecx, [TASK_COUNT]
		872	.scan:
		873	cmp [ebx+APPDATA.dir_table], eax
		874	jnz .cont
		875	push ecx
		876	mov ecx, [ebx+APPDATA.saved_esp0]
		877	cmp word [ecx-v86_regs.size+v86_regs.esp], 6
		878	jb .cont2
		879	movzx edx, word [ecx-v86_regs.size+v86_regs.ss]
		880	shl edx, 4
		881	push eax
		882	movzx eax, word [ecx-v86_regs.size+v86_regs.esp]
		883	sub eax, 6
		884	add edx, eax
		885	mov eax, edx
		886	call v86_get_lin_addr
		887	cmp eax, 0x1000
		888	jb .cont3
		889	lea eax, [edx+5]
		890	call v86_get_lin_addr
		891	cmp eax, 0x1000
		892	jb .cont3
		893	pop eax
		894	pop ecx
		895	jmp .found
		896	.cont3:
		897	pop eax
		898	.cont2:
		899	pop ecx
		900	.cont:
		901	loop .scan
		902	mov ecx, edi
		903	call irq_eoi
		904	popad
		905	iretd
		906	.found:
		907	mov cr3, eax
		908	sub word [esi-v86_regs.size+v86_regs.esp], 6
		909	mov ecx, [esi-v86_regs.size+v86_regs.eip]
		910	mov word [edx], cx
		911	mov ecx, [esi-v86_regs.size+v86_regs.cs]
		912	mov word [edx+2], cx
		913	mov ecx, [esi-v86_regs.size+v86_regs.eflags]
		914	mov word [edx+4], cx
		915	lea eax, [edi+8]
		916	cmp al, 10h
		917	jb @f
		918	add al, 60h
		919	@@:
		920	mov cx, [eax*4]
		921	mov word [esi-v86_regs.size+v86_regs.eip], cx
		922	mov cx, [eax*4+2]
		923	mov word [esi-v86_regs.size+v86_regs.cs], cx
		924	and byte [esi-v86_regs.size+v86_regs.eflags+1], not 3
		925	call update_counters
		926	lea edi, [ebx + 0x100000000 - SLOT_BASE]
		927	shr edi, 3
		928	add edi, TASK_DATA
		929	call find_next_task.found
		930	call do_change_task
		931	popad
		932	iretd

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(root)/kernel/trunk/core/v86.inc – Rev 2288