Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

;;                                                              ;;

;;  PCI32.INC                                                   ;;

;;                                                              ;;

;;  32 bit PCI driver code                                      ;;

;;                                                              ;;

;;  Version 0.3  April 9, 2007                                  ;;

;;  Version 0.2  December 21st, 2002                            ;;

;;                                                              ;;

;;  Author: Victor Prodan, victorprodan@yahoo.com               ;;

;;          Mihailov Ilia, ghost.nsk@gmail.com                  ;;

;;    Credits:                                                  ;;

;;          Ralf Brown                                          ;;

;;          Mike Hibbett, mikeh@oceanfree.net                   ;;

;;                                                              ;;

;;  See file COPYING for details                                ;;

;;                                                              ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision: 1353 $

;***************************************************************************

;   Function

;      pci_api:

;

;   Description

;       entry point for system PCI calls

;***************************************************************************

align 4

pci_api:

	cmp  [pci_access_enabled],1

	jne  no_pci_access_for_applications

	or al,al

	jnz pci_fn_1

	; PCI function 0: get pci version (AH.AL)

	movzx eax,word [BOOT_VAR+0x9022]

	ret

pci_fn_1:

	cmp al,1

	jnz pci_fn_2

	; PCI function 1: get last bus in AL

	mov al,[BOOT_VAR+0x9021]

	ret

pci_fn_2:

	cmp al,2

	jne pci_fn_3

	; PCI function 2: get pci access mechanism

	mov al,[BOOT_VAR+0x9020]

	ret

pci_fn_3:

	cmp al,4

	jz pci_read_reg   ;byte

	cmp al,5

	jz pci_read_reg   ;word

	cmp al,6

	jz pci_read_reg   ;dword

	cmp al,8

	jz pci_write_reg  ;byte

	cmp al,9

	jz pci_write_reg  ;word

	cmp al,10

	jz pci_write_reg  ;dword

	cmp al,11	    ; <<< user-level MMIO functions <<< NEW!

	jz pci_mmio_init

	cmp al,12

	jz pci_mmio_map

	cmp al,13

	jz pci_mmio_unmap

      no_pci_access_for_applications:

	mov eax,-1

	ret

;***************************************************************************

;   Function

;      pci_make_config_cmd

;

;   Description

;       creates a command dword  for use with the PCI bus

;       bus # in ah

;       device+func in bh (dddddfff)

;       register in bl

;

;      command dword returned in eax ( 10000000 bbbbbbbb dddddfff rrrrrr00 )

;***************************************************************************

align 4

pci_make_config_cmd:

    shl     eax,8	   ; move bus to bits 16-23

    mov     ax,bx	   ; combine all

    and     eax,0xffffff

    or	    eax,0x80000000

    ret

;***************************************************************************

;   Function

;      pci_read_reg:

;

;   Description

;       read a register from the PCI config space into EAX/AX/AL

;       IN: ah=bus,device+func=bh,register address=bl

;           number of bytes to read (1,2,4) coded into AL, bits 0-1

;           (0 - byte, 1 - word, 2 - dword)

;***************************************************************************

align 4

pci_read_reg:

	cmp	byte [BOOT_VAR+0x9020],2 ;what mechanism will we use?

	je	pci_read_reg_2

		; mechanism 1

	push	esi   ; save register size into ESI

	mov	esi,eax

	and	esi,3

	call	pci_make_config_cmd

	mov	ebx,eax

		; get current state

	mov	dx,0xcf8

	in	eax, dx

	push	eax

		; set up addressing to config data

	mov	eax,ebx

	and	al,0xfc ; make address dword-aligned

	out	dx,eax

		; get requested DWORD of config data

	mov	dl,0xfc

	and	bl,3

	or	dl,bl	 ; add to port address first 2 bits of register address

	or	esi,esi

	jz	pci_read_byte1

	cmp	esi,1

	jz	pci_read_word1

	cmp	esi,2

	jz	pci_read_dword1

	jmp	pci_fin_read1

pci_read_byte1:

	in	al,dx

	jmp pci_fin_read1

pci_read_word1:

	in	ax,dx

	jmp pci_fin_read1

pci_read_dword1:

	in	eax,dx

	jmp	pci_fin_read1

pci_fin_read1:

		; restore configuration control

	xchg	eax,[esp]

	mov	dx,0xcf8

	out	dx,eax

	pop	eax

	pop	esi

	ret

pci_read_reg_2:

	test	bh,128	;mech#2 only supports 16 devices per bus

	jnz	pci_read_reg_err

	push esi   ; save register size into ESI

	mov esi,eax

	and esi,3

	push	eax

		;store current state of config space

	mov	dx,0xcf8

	in	al,dx

	mov	ah,al

	mov	dl,0xfa

	in	al,dx

	xchg	eax,[esp]

		; out 0xcfa,bus

	mov	al,ah

	out	dx,al

		; out 0xcf8,0x80

	mov	dl,0xf8

	mov	al,0x80

	out	dx,al

		; compute addr

	shr	bh,3 ; func is ignored in mechanism 2

	or	bh,0xc0

	mov	dx,bx

	or	esi,esi

	jz	pci_read_byte2

	cmp	esi,1

	jz	pci_read_word2

	cmp	esi,2

	jz	pci_read_dword2

	jmp	pci_fin_read2

pci_read_byte2:

	in	al,dx

	jmp pci_fin_read2

pci_read_word2:

	in	ax,dx

	jmp pci_fin_read2

pci_read_dword2:

	in	eax,dx

;       jmp pci_fin_read2

pci_fin_read2:

		; restore configuration space

	xchg	eax,[esp]

	mov	dx,0xcfa

	out	dx,al

	mov	dl,0xf8

	mov	al,ah

	out	dx,al

	pop	eax

	pop	esi

	ret

pci_read_reg_err:

	xor	eax,eax

	dec	eax

	ret

;***************************************************************************

;   Function

;      pci_write_reg:

;

;   Description

;       write a register from ECX/CX/CL into the PCI config space

;       IN: ah=bus,device+func=bh,register address (dword aligned)=bl,

;           value to write in ecx

;           number of bytes to write (1,2,4) coded into AL, bits 0-1

;           (0 - byte, 1 - word, 2 - dword)

;***************************************************************************

align 4

pci_write_reg:

	cmp byte [BOOT_VAR+0x9020],2 ;what mechanism will we use?

	je pci_write_reg_2

		; mechanism 1

	push	esi   ; save register size into ESI

	mov	esi,eax

	and	esi,3

	call	pci_make_config_cmd

	mov	ebx,eax

		; get current state into ecx

	mov	dx,0xcf8

	in	eax, dx

	push	eax

		; set up addressing to config data

	mov	eax,ebx

	and	al,0xfc ; make address dword-aligned

	out	dx,eax

		; write DWORD of config data

	mov	dl,0xfc

	and	bl,3

	or	dl,bl

	mov	eax,ecx

	or	esi,esi

	jz	pci_write_byte1

	cmp	esi,1

	jz	pci_write_word1

	cmp	esi,2

	jz	pci_write_dword1

	jmp	pci_fin_write1

pci_write_byte1:

	out	dx,al

	jmp pci_fin_write1

pci_write_word1:

	out	dx,ax

	jmp pci_fin_write1

pci_write_dword1:

	out	dx,eax

	jmp	pci_fin_write1

pci_fin_write1:

		; restore configuration control

	pop	eax

	mov	dl,0xf8

	out	dx,eax

	xor	eax,eax

	pop	esi

	ret

pci_write_reg_2:

	test	bh,128	;mech#2 only supports 16 devices per bus

	jnz	pci_write_reg_err

	push esi   ; save register size into ESI

	mov esi,eax

	and esi,3

	push	eax

		;store current state of config space

	mov	dx,0xcf8

	in	al,dx

	mov	ah,al

	mov	dl,0xfa

	in	al,dx

	xchg	eax,[esp]

		; out 0xcfa,bus

	mov	al,ah

	out	dx,al

		; out 0xcf8,0x80

	mov	dl,0xf8

	mov	al,0x80

	out	dx,al

		; compute addr

	shr	bh,3 ; func is ignored in mechanism 2

	or	bh,0xc0

	mov	dx,bx

		; write register

	mov	eax,ecx

	or	esi,esi

	jz	pci_write_byte2

	cmp	esi,1

	jz	pci_write_word2

	cmp	esi,2

	jz	pci_write_dword2

	jmp	pci_fin_write2

pci_write_byte2:

	out	dx,al

	jmp pci_fin_write2

pci_write_word2:

	out	dx,ax

	jmp pci_fin_write2

pci_write_dword2:

	out	dx,eax

	jmp	pci_fin_write2

pci_fin_write2:

		; restore configuration space

	pop	eax

	mov	dx,0xcfa

	out	dx,al

	mov	dl,0xf8

	mov	al,ah

	out	dx,al

	xor	eax,eax

	pop	esi

	ret

pci_write_reg_err:

	xor	eax,eax

	dec	eax

	ret

;***************************************************************************

;   Function

;      pci_mmio_init ; NEW!

;

;   Description

;       IN:  bx = device's PCI bus address (bbbbbbbbdddddfff)

;       returns ax = user heap space available (bytes)

;   Error codes

;       eax = -1 : PCI user access blocked,

;       eax = -2 : device not registered for uMMIO service

;       eax = -3 : user heap initialization failure

;***************************************************************************

align 4

pci_mmio_init:

    cmp     bx, word [mmio_pci_addr]	; must be set in kernel/data32.inc

    jz	    @f

    mov     eax,-2

    ret

@@:

    call    init_heap	   ; (if not initialized yet)

    or	    eax,eax

    jz	    @f

    ret

@@:

    mov     eax,-3

    ret

;***************************************************************************

;   Function

;      pci_mmio_map ; NEW!

;

;   Description

;       maps a block of PCI memory to user-accessible linear address

;

;       WARNING! This VERY EXPERIMENTAL service is for one chosen PCI device only!

;       The target device address should be set in kernel var mmio_pci_addr

;

;       IN:  ah = BAR#;

;       IN: ebx = block size (bytes);

;       IN: ecx = offset in MMIO block (in 4K-pages, to avoid misaligned pages);

;

;   Returns eax = MMIO block's linear address in the userspace (if no error)

;

;

;   Error codes

;       eax = -1 : user access to PCI blocked,

;       eax = -2 : an invalid BAR register referred

;       eax = -3 : no i/o space on that BAR

;       eax = -4 : a port i/o BAR register referred

;       eax = -5 : dynamic userspace allocation problem

;***************************************************************************

align 4

pci_mmio_map:

    and     edx,0x0ffff

    cmp     ah,6

    jc     .bar_0_5

    jz     .bar_rom

    mov     eax,-2

    ret

.bar_rom:

    mov    ah, 8	; bar6 = Expansion ROM base address

.bar_0_5:

    push    ecx

    add     ebx, 4095

    and     ebx,-4096

    push    ebx

    mov     bl, ah	; bl = BAR# (0..5), however bl=8 for BAR6

    shl     bl, 1

    shl     bl, 1

    add     bl, 0x10	; now bl = BAR offset in PCI config. space

    mov     ax,word [mmio_pci_addr]

    mov     bh, al	; bh = dddddfff

    mov     al, 2	; al : DW to read

    call    pci_read_reg

    or	    eax, eax

    jnz     @f

    mov     eax,-3	; empty I/O space

    jmp     mmio_ret_fail

@@:

    test    eax, 1

    jz	    @f

    mov     eax,-4	; damned ports (not MMIO space)

    jmp     mmio_ret_fail

@@:

    pop     ecx 	; ecx = block size, bytes (expanded to whole page)

    mov     ebx, ecx	; user_alloc destroys eax, ecx, edx, but saves ebx

    push    eax 	; store MMIO physical address + keep 2DWords in the stack

    stdcall user_alloc, ecx

    or	    eax, eax

    jnz     mmio_map_over

    mov     eax,-5	; problem with page allocation

mmio_ret_fail:

    pop     ecx

    pop     edx

    ret

mmio_map_over:

    mov     ecx, ebx	; ecx = size (bytes, expanded to whole page)

    shr     ecx, 12	; ecx = number of pages

    mov     ebx, eax	; ebx = linear address

    pop     eax 	; eax = MMIO start

    pop     edx 	; edx = MMIO shift (pages)

    shl     edx, 12	; edx = MMIO shift (bytes)

    add     eax, edx	; eax = uMMIO physical address

    or	    eax, PG_SHARED

    or	    eax, PG_UW

    or	    eax, PG_NOCACHE

    mov     edi, ebx

    call    commit_pages

    mov     eax, edi

    ret

;***************************************************************************

;   Function

;      pci_mmio_unmap_page ; NEW!

;

;   Description

;       unmaps the linear space previously tied to a PCI memory block

;

;       IN: ebx = linear address of space previously allocated by pci_mmio_map

;       returns eax = 1 if successfully unmapped

;

;   Error codes

;       eax = -1 if no user PCI access allowed,

;       eax =  0 if unmapping failed

;***************************************************************************

align 4

pci_mmio_unmap:

    stdcall user_free, ebx

    ret

;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

; VendID (2), DevID (2), Revision = 0 (1), Class Code (3), FNum (1), Bus (1)

pci_emu_dat:	times	30*10 db 0

;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

align 4

sys_pcibios:

	xchg	ebx, eax

	xchg	ecx, eax

	xchg	edx, eax

	xchg	esi, eax

	xchg	edi, eax

	cmp	[pci_access_enabled], 1

	jne	.unsupported_func

	cmp	[pci_bios_entry], 0

	jz	.emulate_bios

	push	ds

	mov	ax, pci_data_sel

	mov	ds, ax

	mov	eax, ebp

	mov	ah, 0B1h

	call	pword [cs:pci_bios_entry]

	pop	ds

	jmp	.return

	;-=-=-=-=-=-=-=-=

.emulate_bios:

	cmp	ebp, 1			; PCI_FUNCTION_ID

	jnz	.not_PCI_BIOS_PRESENT

	mov	edx, 'PCI '

	mov	al, [OS_BASE+0x2F0000 + 0x9020]

	mov	bx, [OS_BASE+0x2F0000 + 0x9022]

	mov	cl, [OS_BASE+0x2F0000 + 0x9021]

	xor	ah, ah

	jmp	.return_abcd

.not_PCI_BIOS_PRESENT:

	cmp	ebp, 2			; FIND_PCI_DEVICE

	jne	.not_FIND_PCI_DEVICE

	mov	ebx, pci_emu_dat

..nxt:	cmp	[ebx], dx

	jne	..no

	cmp	[ebx + 2], cx

	jne	..no

	dec	si

	jns	..no

	mov	bx, [ebx + 4]

	xor	ah, ah

	jmp	.return_ab

..no:	cmp	word[ebx], 0

	je	..dev_not_found

	add	ebx, 10

	jmp	..nxt

..dev_not_found:

	mov	ah, 0x86		; DEVICE_NOT_FOUND

	jmp	.return_a

.not_FIND_PCI_DEVICE:

	cmp	ebp, 3			; FIND_PCI_CLASS_CODE

	jne	.not_FIND_PCI_CLASS_CODE

	mov	esi, pci_emu_dat

	shl	ecx, 8

..nxt2: cmp	[esi], ecx

	jne	..no2

	mov	bx, [esi]

	xor	ah, ah

	jmp	.return_ab

..no2:	cmp	dword[esi], 0

	je	..dev_not_found

	add	esi, 10

	jmp	..nxt2

.not_FIND_PCI_CLASS_CODE:

	cmp	ebp, 8			; READ_CONFIG_*

	jb	.not_READ_CONFIG

	cmp	ebp, 0x0A

	ja	.not_READ_CONFIG

	mov	eax, ebp

	mov	ah, bh

	mov	edx, edi

	mov	bh, bl

	mov	bl, dl

	call	pci_read_reg

	mov	ecx, eax

	xor	ah, ah			; SUCCESSFUL

	jmp	.return_abc

.not_READ_CONFIG:

	cmp	ebp, 0x0B		; WRITE_CONFIG_*

	jb	.not_WRITE_CONFIG

	cmp	ebp, 0x0D

	ja	.not_WRITE_CONFIG

	lea	eax, [ebp+1]

	mov	ah, bh

	mov	edx, edi

	mov	bh, bl

	mov	bl, dl

	call	pci_write_reg

	xor	ah, ah			; SUCCESSFUL

	jmp	.return_abc

.not_WRITE_CONFIG:

.unsupported_func:

	mov	ah, 0x81		; FUNC_NOT_SUPPORTED

.return:mov	dword[esp + 8 ], edi

	mov	dword[esp + 12], esi

.return_abcd:

	mov	dword[esp + 28], edx

.return_abc:

	mov	dword[esp + 32], ecx

.return_ab:

	mov	dword[esp + 24], ebx

.return_a:

	mov	dword[esp + 36], eax

	ret