;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; DEC 21x4x driver for KolibriOS ;;
;; ;;
;; Based on dec21140.Asm from Solar OS by ;;
;; Eugen Brasoveanu, ;;
;; Ontanu Bogdan Valentin ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
format MS COFF
API_VERSION = 0x01000100
DRIVER_VERSION = 5
MAX_DEVICES = 16
RX_DES_COUNT = 4 ; no of RX descriptors, must be power of 2
RX_BUFF_SIZE = 2048 ; size of buffer for each descriptor, must be multiple of 4 and <= 2048 TDES1_TBS1_MASK
TX_DES_COUNT = 4 ; no of TX descriptors, must be power of 2
TX_BUFF_SIZE = 2048 ; size of buffer for each descriptor, used for memory allocation only
DEBUG = 1
__DEBUG__ = 1
__DEBUG_LEVEL__ = 1
include 'proc32.inc'
include 'imports.inc'
include 'fdo.inc'
include 'netdrv.inc'
public START
public service_proc
public version
virtual at ebx
device:
ETH_DEVICE
.rx_p_des dd ? ; descriptors ring with received packets
.tx_p_des dd ? ; descriptors ring with 'to transmit' packets
.tx_free_des dd ? ; Tx descriptors available
.tx_wr_des dd ? ; Tx current descriptor to write data to
.tx_rd_des dd ? ; Tx current descriptor to read TX completion
.rx_crt_des dd ? ; Rx current descriptor
.io_addr dd ?
.pci_bus dd ?
.pci_dev dd ?
.irq_line db ?
.size = $ - device
end virtual
;-------------------------------------------
; configuration registers
;-------------------------------------------
CFCS = 4 ; configuration and status register
CSR0 = 0x00 ; Bus mode
CSR1 = 0x08 ; Transmit Poll Command
CSR2 = 0x10 ; Receive Poll Command
CSR3 = 0x18 ; Receive list base address
CSR4 = 0x20 ; Transmit list base address
CSR5 = 0x28 ; Status
CSR6 = 0x30 ; Operation mode
CSR7 = 0x38 ; Interrupt enable
CSR8 = 0x40 ; Missed frames and overflow counter
CSR9 = 0x48 ; Boot ROM, serial ROM, and MII management
CSR10 = 0x50 ; Boot ROM programming address
CSR11 = 0x58 ; General-purpose timer
CSR12 = 0x60 ; General-purpose port
CSR13 = 0x68
CSR14 = 0x70
CSR15 = 0x78 ; Watchdog timer
;--------bits/commands of CSR0-------------------
CSR0_RESET = 1b
CSR0_WIE = 1 shl 24 ; Write and Invalidate Enable
CSR0_RLE = 1 shl 23 ; PCI Read Line Enable
CSR0_RML = 1 shl 21 ; PCI Read Multiple
CSR0_CACHEALIGN_NONE = 00b shl 14
CSR0_CACHEALIGN_32 = 01b shl 14
CSR0_CACHEALIGN_64 = 10b shl 14
CSR0_CACHEALIGN_128 = 11b shl 14
; using values from linux driver..
CSR0_DEFAULT = CSR0_WIE + CSR0_RLE + CSR0_RML + CSR0_CACHEALIGN_NONE
;------- CSR5 -STATUS- bits --------------------------------
CSR5_TI = 1 shl 0 ; Transmit interupt - frame transmition completed
CSR5_TPS = 1 shl 1 ; Transmit process stopped
CSR5_TU = 1 shl 2 ; Transmit Buffer unavailable
CSR5_TJT = 1 shl 3 ; Transmit Jabber Timeout (transmitter had been excessively active)
CSR5_UNF = 1 shl 5 ; Transmit underflow - FIFO underflow
CSR5_RI = 1 shl 6 ; Receive Interrupt
CSR5_RU = 1 shl 7 ; Receive Buffer unavailable
CSR5_RPS = 1 shl 8 ; Receive Process stopped
CSR5_RWT = 1 shl 9 ; Receive Watchdow Timeout
CSR5_ETI = 1 shl 10 ; Early transmit Interrupt
CSR5_GTE = 1 shl 11 ; General Purpose Timer Expired
CSR5_FBE = 1 shl 13 ; Fatal bus error
CSR5_ERI = 1 shl 14 ; Early receive Interrupt
CSR5_AIS = 1 shl 15 ; Abnormal interrupt summary
CSR5_NIS = 1 shl 16 ; normal interrupt summary
CSR5_RS_SH = 17 ; Receive process state -shift
CSR5_RS_MASK = 111b ; -mask
CSR5_TS_SH = 20 ; Transmit process state -shift
CSR5_TS_MASK = 111b ; -mask
CSR5_EB_SH = 23 ; Error bits -shift
CSR5_EB_MASK = 111b ; Error bits -mask
;CSR5 TS values
CSR5_TS_STOPPED = 000b
CSR5_TS_RUNNING_FETCHING_DESC = 001b
CSR5_TS_RUNNING_WAITING_TX = 010b
CSR5_TS_RUNNING_READING_BUFF = 011b
CSR5_TS_RUNNING_SETUP_PCKT = 101b
CSR5_TS_SUSPENDED = 110b
CSR5_TS_RUNNING_CLOSING_DESC = 111b
;------- CSR6 -OPERATION MODE- bits --------------------------------
CSR6_HP = 1 shl 0 ; Hash/Perfect Receive Filtering mode
CSR6_SR = 1 shl 1 ; Start/Stop receive
CSR6_HO = 1 shl 2 ; Hash only Filtering mode
CSR6_PB = 1 shl 3 ; Pass bad frames
CSR6_IF = 1 shl 4 ; Inverse filtering
CSR6_SB = 1 shl 5 ; Start/Stop backoff counter
CSR6_PR = 1 shl 6 ; Promiscuos mode -default after reset
CSR6_PM = 1 shl 7 ; Pass all multicast
CSR6_F = 1 shl 9 ; Full Duplex mode
CSR6_OM_SH = 10 ; Operating Mode -shift
CSR6_OM_MASK = 11b ; -mask
CSR6_FC = 1 shl 12 ; Force Collision Mode
CSR6_ST = 1 shl 13 ; Start/Stop Transmission Command
CSR6_TR_SH = 14 ; Threshold Control -shift
CSR6_TR_MASK = 11b ; -mask
CSR6_CA = 1 shl 17 ; Capture Effect Enable
CSR6_PS = 1 shl 18 ; Port select SRL / MII/SYM
CSR6_HBD = 1 shl 19 ; Heartbeat Disable
CSR6_SF = 1 shl 21 ; Store and Forward -transmit full packet only
CSR6_TTM = 1 shl 22 ; Transmit Threshold Mode -
CSR6_PCS = 1 shl 23 ; PCS active and MII/SYM port operates in symbol mode
CSR6_SCR = 1 shl 24 ; Scrambler Mode
CSR6_MBO = 1 shl 25 ; Must Be One
CSR6_RA = 1 shl 30 ; Receive All
CSR6_SC = 1 shl 31 ; Special Capture Effect Enable
;------- CSR7 -INTERRUPT ENABLE- bits --------------------------------
CSR7_TI = 1 shl 0 ; transmit Interrupt Enable (set with CSR7<16> & CSR5<0> )
CSR7_TS = 1 shl 1 ; transmit Stopped Enable (set with CSR7<15> & CSR5<1> )
CSR7_TU = 1 shl 2 ; transmit buffer underrun Enable (set with CSR7<16> & CSR5<2> )
CSR7_TJ = 1 shl 3 ; transmit jabber timeout enable (set with CSR7<15> & CSR5<3> )
CSR7_UN = 1 shl 5 ; underflow Interrupt enable (set with CSR7<15> & CSR5<5> )
CSR7_RI = 1 shl 6 ; receive Interrupt enable (set with CSR7<16> & CSR5<5> )
CSR7_RU = 1 shl 7 ; receive buffer unavailable enable (set with CSR7<15> & CSR5<7> )
CSR7_RS = 1 shl 8 ; Receive stopped enable (set with CSR7<15> & CSR5<8> )
CSR7_RW = 1 shl 9 ; receive watchdog timeout enable (set with CSR7<15> & CSR5<9> )
CSR7_ETE = 1 shl 10 ; Early transmit Interrupt enable (set with CSR7<15> & CSR5<10> )
CSR7_GPT = 1 shl 11 ; general purpose timer enable (set with CSR7<15> & CSR5<11> )
CSR7_FBE = 1 shl 13 ; Fatal bus error enable (set with CSR7<15> & CSR5<13> )
CSR7_ERE = 1 shl 14 ; Early receive enable (set with CSR7<16> & CSR5<14> )
CSR7_AI = 1 shl 15 ; Abnormal Interrupt Summary Enable (enables CSR5<0,3,7,8,9,10,13>)
CSR7_NI = 1 shl 16 ; Normal Interrup Enable (enables CSR5<0,2,6,11,14>)
CSR7_DEFAULT = CSR7_TI + CSR7_TS + CSR7_RI + CSR7_RS + CSR7_TU + CSR7_TJ + CSR7_UN + \
CSR7_RU + CSR7_RW + CSR7_FBE + CSR7_AI + CSR7_NI
;----------- descriptor structure ---------------------
struc DES {
.status dd ? ; bit 31 is 'own' and rest is 'status'
.length dd ? ; control bits + bytes-count buffer 1 + bytes-count buffer 2
.buffer1 dd ? ; pointer to buffer1
.buffer2 dd ? ; pointer to buffer2 or in this case to next descriptor, as we use a chained structure
.virtaddr dd ?
.size = 64 ; 64, for alignment purposes
}
virtual at 0
DES DES
end virtual
;common to Rx and Tx
DES0_OWN = 1 shl 31 ; if set, the NIC controls the descriptor, otherwise driver 'owns' the descriptors
;receive
RDES0_ZER = 1 shl 0 ; must be 0 if legal length :D
RDES0_CE = 1 shl 1 ; CRC error, valid only on last desc (RDES0<8>=1)
RDES0_DB = 1 shl 2 ; dribbling bit - not multiple of 8 bits, valid only on last desc (RDES0<8>=1)
RDES0_RE = 1 shl 3 ; Report on MII error.. i dont realy know what this means :P
RDES0_RW = 1 shl 4 ; received watchdog timer expiration - must set CSR5<9>, valid only on last desc (RDES0<8>=1)
RDES0_FT = 1 shl 5 ; frame type: 0->IEEE802.0 (len<1500) 1-> ETHERNET frame (len>1500), valid only on last desc (RDES0<8>=1)
RDES0_CS = 1 shl 6 ; Collision seen, valid only on last desc (RDES0<8>=1)
RDES0_TL = 1 shl 7 ; Too long(>1518)-NOT AN ERROR, valid only on last desc (RDES0<8>=1)
RDES0_LS = 1 shl 8 ; Last descriptor of current frame
RDES0_FS = 1 shl 9 ; First descriptor of current frame
RDES0_MF = 1 shl 10 ; Multicast frame, valid only on last desc (RDES0<8>=1)
RDES0_RF = 1 shl 11 ; Runt frame, valid only on last desc (RDES0<8>=1) and id overflow
RDES0_DT_SERIAL = 00b shl 12 ; Data type-Serial recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DT_INTERNAL = 01b shl 12 ; Data type-Internal loopback recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DT_EXTERNAL = 11b shl 12 ; Data type-External loopback recv frame, valid only on last desc (RDES0<8>=1)
RDES0_DE = 1 shl 14 ; Descriptor error - cant own a new desc and frame doesnt fit, valid only on last desc (RDES0<8>=1)
RDES0_ES = 1 shl 15 ; Error Summmary - bits 1+6+11+14, valid only on last desc (RDES0<8>=1)
RDES0_FL_SH = 16 ; Field length shift, valid only on last desc (RDES0<8>=1)
RDES0_FL_MASK = 11111111111111b ; Field length mask (+CRC), valid only on last desc (RDES0<8>=1)
RDES0_FF = 1 shl 30 ; Filtering fail-frame failed address recognition test(must CSR6<30>=1), valid only on last desc (RDES0<8>=1)
RDES1_RBS1_MASK = 11111111111b ; first buffer size MASK
RDES1_RBS2_SH = 11 ; second buffer size SHIFT
RDES1_RBS2_MASK = 11111111111b ; second buffer size MASK
RDES1_RCH = 1 shl 24 ; Second address chained - second address (buffer) is next desc address
RDES1_RER = 1 shl 25 ; Receive End of Ring - final descriptor, NIC must return to first desc
;transmition
TDES0_DE = 1 shl 0 ; Deffered
TDES0_UF = 1 shl 1 ; Underflow error
TDES0_LF = 1 shl 2 ; Link fail report (only if CSR6<23>=1)
TDES0_CC_SH = 3 ; Collision Count shift - no of collision before transmition
TDES0_CC_MASK = 1111b ; Collision Count mask
TDES0_HF = 1 shl 7 ; Heartbeat fail
TDES0_EC = 1 shl 8 ; Excessive Collisions - >16 collisions
TDES0_LC = 1 shl 9 ; Late collision
TDES0_NC = 1 shl 10 ; No carrier
TDES0_LO = 1 shl 11 ; Loss of carrier
TDES0_TO = 1 shl 14 ; Transmit Jabber Timeout
TDES0_ES = 1 shl 15 ; Error summary TDES0<1+8+9+10+11+14>=1
TDES1_TBS1_MASK = 11111111111b ; Buffer 1 size mask
TDES1_TBS2_SH = 11 ; Buffer 2 size shift
TDES1_TBS2_MASK = 11111111111b ; Buffer 2 size mask
TDES1_FT0 = 1 shl 22 ; Filtering type 0
TDES1_DPD = 1 shl 23 ; Disabled padding for packets <64bytes, no padding
TDES1_TCH = 1 shl 24 ; Second address chained - second buffer pointer is to next desc
TDES1_TER = 1 shl 25 ; Transmit end of ring - final descriptor
TDES1_AC = 1 shl 26 ; Add CRC disable -pretty obvious
TDES1_SET = 1 shl 27 ; Setup packet
TDES1_FT1 = 1 shl 28 ; Filtering type 1
TDES1_FS = 1 shl 29 ; First segment - buffer is first segment of frame
TDES1_LS = 1 shl 30 ; Last segment
TDES1_IC = 1 shl 31 ; Interupt on completion (CSR5<0>=1) valid when TDES1<30>=1
MAX_ETH_FRAME_SIZE = 1514
RX_MEM_TOTAL_SIZE = RX_DES_COUNT*(DES.size+RX_BUFF_SIZE)
TX_MEM_TOTAL_SIZE = TX_DES_COUNT*(DES.size+TX_BUFF_SIZE)
;=============================================================================
; serial ROM operations
;=============================================================================
CSR9_SR = 1 shl 11 ; SROM Select
CSR9_RD = 1 shl 14 ; ROM Read Operation
CSR9_SROM_DO = 1 shl 3 ; Data Out for SROM
CSR9_SROM_DI = 1 shl 2 ; Data In to SROM
CSR9_SROM_CK = 1 shl 1 ; clock for SROM
CSR9_SROM_CS = 1 shl 0 ; chip select.. always needed
; assume dx is CSR9
macro SROM_Delay {
push eax
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
in eax, dx
pop eax
}
; assume dx is CSR9
macro MDIO_Delay {
push eax
in eax, dx
pop eax
}
macro Bit_Set a_bit {
in eax, dx
or eax, a_bit
out dx , eax
}
macro Bit_Clear a_bit {
in eax, dx
and eax, not (a_bit)
out dx, eax
}
section '.flat' code readable align 16
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; proc START ;;
;; ;;
;; (standard driver proc) ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
proc START stdcall, state:dword
cmp [state], 1
jne .exit
.entry:
DEBUGF 2,"Loading %s driver\n", my_service
stdcall RegService, my_service, service_proc
ret
.fail:
.exit:
xor eax, eax
ret
endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; proc SERVICE_PROC ;;
;; ;;
;; (standard driver proc) ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
proc service_proc stdcall, ioctl:dword
mov edx, [ioctl]
mov eax, [IOCTL.io_code]
;------------------------------------------------------
cmp eax, 0 ;SRV_GETVERSION
jne @F
cmp [IOCTL.out_size], 4
jb .fail
mov eax, [IOCTL.output]
mov [eax], dword API_VERSION
xor eax, eax
ret
;------------------------------------------------------
@@:
cmp eax, 1 ;SRV_HOOK
jne .fail
cmp [IOCTL.inp_size], 3 ; Data input must be at least 3 bytes
jb .fail
mov eax, [IOCTL.input]
cmp byte [eax], 1 ; 1 means device number and bus number (pci) are given
jne .fail ; other types arent supported for this card yet
; check if the device is already listed
mov esi, device_list
mov ecx, [devices]
test ecx, ecx
jz .firstdevice
; mov eax, [IOCTL.input] ; get the pci bus and device numbers
mov ax , [eax+1] ;
.nextdevice:
mov ebx, [esi]
cmp al, byte[device.pci_bus]
jne @f
cmp ah, byte[device.pci_dev]
je .find_devicenum ; Device is already loaded, let's find it's device number
@@:
add esi, 4
loop .nextdevice
; This device doesnt have its own eth_device structure yet, lets create one
.firstdevice:
cmp [devices], MAX_DEVICES ; First check if the driver can handle one more card
jae .fail
push edx
stdcall KernelAlloc, dword device.size ; Allocate the buffer for eth_device structure
pop edx
test eax, eax
jz .fail
mov ebx, eax ; ebx is always used as a pointer to the structure (in driver, but also in kernel code)
; Fill in the direct call addresses into the struct
mov [device.reset], reset
mov [device.transmit], transmit
mov [device.unload], unload
mov [device.name], my_service
; save the pci bus and device numbers
mov eax, [IOCTL.input]
movzx ecx, byte[eax+1]
mov [device.pci_bus], ecx
movzx ecx, byte[eax+2]
mov [device.pci_dev], ecx
; Now, it's time to find the base io addres of the PCI device
PCI_find_io
; We've found the io address, find IRQ now
PCI_find_irq
DEBUGF 2,"Hooking into device, dev:%x, bus:%x, irq:%x, addr:%x\n",\
[device.pci_dev]:1,[device.pci_bus]:1,[device.irq_line]:1,[device.io_addr]:8
allocate_and_clear [device.rx_p_des], RX_DES_COUNT*(DES.size+RX_BUFF_SIZE), .err
allocate_and_clear [device.tx_p_des], TX_DES_COUNT*(DES.size+TX_BUFF_SIZE), .err
; Ok, the eth_device structure is ready, let's probe the device
; Because initialization fires IRQ, IRQ handler must be aware of this device
mov eax, [devices] ; Add the device structure to our device list
mov [device_list+4*eax], ebx ; (IRQ handler uses this list to find device)
inc [devices] ;
call probe ; this function will output in eax
test eax, eax
jnz .err2 ; If an error occured, exit
mov [device.type], NET_TYPE_ETH
call NetRegDev
cmp eax, -1
je .destroy
ret
; If the device was already loaded, find the device number and return it in eax
.find_devicenum:
DEBUGF 2,"Trying to find device number of already registered device\n"
call NetPtrToNum ; This kernel procedure converts a pointer to device struct in ebx
; into a device number in edi
mov eax, edi ; Application wants it in eax instead
DEBUGF 2,"Kernel says: %u\n", eax
ret
; If an error occured, remove all allocated data and exit (returning -1 in eax)
.destroy:
; todo: reset device into virgin state
.err2:
dec [devices]
.err:
DEBUGF 2,"removing device structure\n"
stdcall KernelFree, [device.rx_p_des]
stdcall KernelFree, [device.tx_p_des]
stdcall KernelFree, ebx
.fail:
or eax, -1
ret
;------------------------------------------------------
endp
;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;
;; ;;
;; Actual Hardware dependent code starts here ;;
;; ;;
;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;
align 4
unload:
; TODO: (in this particular order)
;
; - Stop the device
; - Detach int handler
; - Remove device from local list (RTL8139_LIST)
; - call unregister function in kernel
; - Remove all allocated structures and buffers the card used
or eax,-1
ret
macro status {
set_io CSR5
in eax, dx
DEBUGF 1,"CSR5: %x\n", eax
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Probe ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
probe:
DEBUGF 2,"Probing dec21x4x device: "
PCI_make_bus_master
stdcall PciRead32, [device.pci_bus], [device.pci_dev], 0 ; get device/vendor id
DEBUGF 1,"Vendor id: 0x%x\n", ax
cmp ax, 0x1011
je .dec
cmp ax, 0x1317
je .admtek
jmp .notfound
.dec:
shr eax, 16
DEBUGF 1,"Vendor ok!, device id: 0x%x\n", ax ; TODO: use another method to detect chip!
cmp ax, 0x0009
je .supported_device
cmp ax, 0x0019
je .supported_device2
.admtek:
shr eax, 16
DEBUGF 1,"Vendor ok!, device id: 0x%x\n", ax
cmp ax, 0x0985
je .supported_device
.notfound:
DEBUGF 1,"Device not supported!\n"
or eax, -1
ret
.supported_device2:
; wake up the 21143
xor eax, eax
stdcall PciWrite32, [device.pci_bus], [device.pci_dev], 0x40, eax
.supported_device:
call SROM_GetWidth ; TODO: use this value returned in ecx
; in the read_word routine!
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Reset ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
reset:
DEBUGF 2,"Resetting dec21x4x\n"
;-----------------------------------------------------------
; board software reset - if fails, dont do nothing else
set_io 0
status
set_io CSR0
mov eax, CSR0_RESET
out dx, eax
; wait at least 50 PCI cycles
mov esi, 1000
call Sleep
;-----------
; setup CSR0
set_io 0
status
set_io CSR0
mov eax, CSR0_DEFAULT
out dx, eax
; wait at least 50 PCI cycles
mov esi, 1000
call Sleep
;-----------------------------------
; Read mac from eeprom to driver ram
call read_mac_eeprom
;--------------------------------
; insert irq handler on given irq
movzx eax, [device.irq_line]
DEBUGF 1,"Attaching int handler to irq %x\n", eax:1
stdcall AttachIntHandler, eax, int_handler, dword 0
test eax, eax
jnz @f
DEBUGF 1,"\nCould not attach int handler!\n"
; or eax, -1
; ret
@@:
set_io 0
status
call init_ring
;--------------------------------------------
; setup CSR3 & CSR4 (pointers to descriptors)
set_io 0
status
set_io CSR3
mov eax, [device.rx_p_des]
GetRealAddr
DEBUGF 1,"RX descriptor base address: %x\n", eax
out dx, eax
set_io CSR4
mov eax, [device.tx_p_des]
GetRealAddr
DEBUGF 1,"TX descriptor base address: %x\n", eax
out dx, eax
;-------------------------------------------------------
; setup interrupt mask register -expect IRQs from now on
status
DEBUGF 1,"Enabling interrupts\n"
set_io CSR7
mov eax, CSR7_DEFAULT
out dx, eax
status
;----------
; enable RX
set_io 0
status
DEBUGF 1,"Enable RX\n"
set_io CSR6
Bit_Set CSR6_SR; or CSR6_PR or CSR6_ST
DEBUGF 1,"CSR6: %x\n", eax
status
call start_link
; wait a bit
mov esi, 3000
call Sleep
;----------------------------------------------------
; send setup packet to notify the board about the MAC
call Send_Setup_Packet
xor eax, eax
; clear packet/byte counters
lea edi, [device.bytes_tx]
mov ecx, 6
rep stosd
; Set the mtu, kernel will be able to send now
mov [device.mtu], 1514
; Set link state to unknown
mov [device.state], ETH_LINK_UNKOWN
DEBUGF 1,"Reset done\n"
ret
align 4
init_ring:
;------------------------------------------
; Setup RX descriptors (use chained method)
mov eax, [device.rx_p_des]
GetRealAddr
mov edx, eax
push eax
lea esi, [eax + RX_DES_COUNT*(DES.size)] ; jump over RX descriptors
mov eax, [device.rx_p_des]
add eax, RX_DES_COUNT*(DES.size) ; jump over RX descriptors
mov edi, [device.rx_p_des]
mov ecx, RX_DES_COUNT
.loop_rx_des:
add edx, DES.size
mov [edi + DES.status], DES0_OWN ; hardware owns buffer
mov [edi + DES.length], 1984 + RDES1_RCH ; only size of first buffer, chained buffers
mov [edi + DES.buffer1], esi ; hw buffer address
mov [edi + DES.buffer2], edx ; pointer to next descriptor
mov [edi + DES.virtaddr], eax ; virtual buffer address
DEBUGF 1,"RX desc: buff addr: %x, next desc: %x, real buff addr: %x, real descr addr: %x \n", esi, edx, eax, edi
add esi, RX_BUFF_SIZE
add eax, RX_BUFF_SIZE
add edi, DES.size
dec ecx
jnz .loop_rx_des
; set last descriptor as LAST
sub edi, DES.size
or [edi + DES.length], RDES1_RER ; EndOfRing
pop [edi + DES.buffer2] ; point it to the first descriptor
;---------------------
; Setup TX descriptors
mov eax, [device.tx_p_des]
GetRealAddr
mov edx, eax
push eax
lea esi, [eax + TX_DES_COUNT*(DES.size)] ; jump over TX descriptors
mov eax, [device.tx_p_des]
add eax, TX_DES_COUNT*(DES.size) ; jump over TX descriptors
mov edi, [device.tx_p_des]
mov ecx, TX_DES_COUNT
.loop_tx_des:
add edx, DES.size
mov [edi + DES.status], 0 ; owned by driver
mov [edi + DES.length], TDES1_TCH ; chained method
mov [edi + DES.buffer1], esi ; pointer to buffer
mov [edi + DES.buffer2], edx ; pointer to next descr
mov [edi + DES.virtaddr], eax
DEBUGF 1,"TX desc: buff addr: %x, next desc: %x, virt buff addr: %x, virt descr addr: %x \n", esi, edx, eax, edi
add esi, TX_BUFF_SIZE
add eax, TX_BUFF_SIZE
add edi, DES.size
dec ecx
jnz .loop_tx_des
; set last descriptor as LAST
sub edi, DES.size
or [edi + DES.length], TDES1_TER ; EndOfRing
pop [edi + DES.buffer2] ; point it to the first descriptor
;------------------
; Reset descriptors
mov [device.tx_wr_des], 0
mov [device.tx_rd_des], 0
mov [device.rx_crt_des], 0
mov [device.tx_free_des], TX_DES_COUNT
ret
align 4
start_link:
; TODO: write working code here
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Send setup packet ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
Send_Setup_Packet:
DEBUGF 1,"Sending setup packet\n"
; if no descriptors available, out
mov ecx, 1000
@@loop_wait_desc:
cmp [device.tx_free_des], 0
jne @f
dec ecx
jnz @@loop_wait_desc
mov eax, -1
ret
@@:
; go to current send descriptor
mov edi, [device.tx_p_des]
mov eax, [device.tx_wr_des]
DEBUGF 1,"Got free descriptor: %u (%x)", eax, edi
mov edx, DES.size
mul edx
add edi, eax
DEBUGF 1,"=>%x\n", edi
; if NOT sending FIRST setup packet, must set current descriptor to 0 size for both buffers,
; and go to next descriptor for real setup packet... ;; TODO: check if 2 descriptors are available
; cmp [device.tx_packets], 0
; je .first
;
; and [edi+DES.des1], 0
; mov [edi+DES.des0], DES0_OWN
;
; go to next descriptor
; inc [device.tx_wr_des]
; and [device.tx_wr_des], TX_DES_COUNT-1
;
; dec free descriptors count
; cmp [device.tx_free_des], 0
; jz @f
; dec [device.tx_free_des]
; @@:
;
; ; recompute pointer to current descriptor
; mov edi, [device.tx_p_des]
; mov eax, [device.tx_wr_des]
; mov edx, DES.size
; mul edx
; add edi, eax
.first:
push edi
; copy setup packet to current descriptor
mov edi, [edi + DES.virtaddr]
; copy the address once
lea esi, [device.mac]
DEBUGF 1,"copying packet to %x from %x\n", edi, esi
mov ecx, 3 ; mac is 6 bytes thus 3 words
.loop:
DEBUGF 1,"%x ", [esi]:4
movsw
inc edi
inc edi
dec ecx
jnz .loop
DEBUGF 1,"\n"
; copy 15 times the broadcast address
mov ecx, 3*15
mov eax, 0xffffffff
rep stosd
pop edi
; setup descriptor
DEBUGF 1,"setting up descriptor\n"
mov [edi + DES.length], TDES1_IC + TDES1_SET + TDES1_TCH + 192 ; size must be EXACTLY 192 bytes
mov [edi + DES.status], DES0_OWN
DEBUGF 1,"status: %x\n", [edi + DES.status]:8
DEBUGF 1,"length: %x\n", [edi + DES.length]:8
DEBUGF 1,"buffer1: %x\n", [edi + DES.buffer1]:8
DEBUGF 1,"buffer2: %x\n", [edi + DES.buffer2]:8
; go to next descriptor
inc [device.tx_wr_des]
and [device.tx_wr_des], TX_DES_COUNT-1
; dec free descriptors count
cmp [device.tx_free_des], 0
jz @f
dec [device.tx_free_des]
@@:
; start tx
set_io 0
status
set_io CSR6
in eax, dx
test eax, CSR6_ST ; if NOT started, start now
jnz .already_started
or eax, CSR6_ST
DEBUGF 1,"Starting TX\n"
jmp .do_it
.already_started:
; if already started, issue a Transmit Poll command
set_io CSR1
xor eax, eax
DEBUGF 1,"Issuing transmit poll command\n"
.do_it:
out dx, eax
status
DEBUGF 1,"Sending setup packet, completed!\n"
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Transmit ;;
;; ;;
;; In: buffer pointer in [esp+4] ;;
;; size of buffer in [esp+8] ;;
;; pointer to device structure in ebx ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
transmit:
DEBUGF 1,"Transmitting packet, buffer:%x, size:%u\n",[esp+4],[esp+8]
mov eax, [esp+4]
DEBUGF 1,"To: %x-%x-%x-%x-%x-%x From: %x-%x-%x-%x-%x-%x Type:%x%x\n",\
[eax+00]:2,[eax+01]:2,[eax+02]:2,[eax+03]:2,[eax+04]:2,[eax+05]:2,\
[eax+06]:2,[eax+07]:2,[eax+08]:2,[eax+09]:2,[eax+10]:2,[eax+11]:2,\
[eax+13]:2,[eax+12]:2
cmp dword [esp+8], MAX_ETH_FRAME_SIZE
ja .fail
cmp [device.tx_free_des], 0
je .fail
;--------------------------
; copy packet to crt buffer
mov eax, [device.tx_wr_des]
mov edx, DES.size
mul edx
add eax, [device.tx_p_des]
mov edi, [eax + DES.virtaddr] ; pointer to buffer
mov esi, [esp+4]
mov ecx, [esp+8]
DEBUGF 1,"copying %u bytes from %x to %x\n", ecx, esi, edi
rep movsb
; set packet size
mov ecx, [eax+DES.length]
and ecx, TDES1_TER ; preserve 'End of Ring' bit
or ecx, [esp+8] ; set size
or ecx, TDES1_FS or TDES1_LS or TDES1_IC or TDES1_TCH ; first descr, last descr, interrupt on complete, chained modus
mov [eax+DES.length], ecx
; set descriptor info
mov [eax+DES.status], DES0_OWN ; say it is now owned by the 21x4x
; start tx
set_io 0
status
set_io CSR6
in eax, dx
test eax, CSR6_ST ; if NOT started, start now
jnz .already_started
or eax, CSR6_ST
DEBUGF 1,"Starting TX\n"
jmp .do_it
.already_started:
; if already started, issues a Transmit Poll command
set_io CSR1
mov eax, -1
.do_it:
out dx , eax
; Update stats
inc [device.packets_tx]
mov eax, [esp+8]
add dword [device.bytes_tx], eax
adc dword [device.bytes_tx + 4], 0
; go to next descriptor
inc [device.tx_wr_des]
and [device.tx_wr_des], TX_DES_COUNT-1
; dec free descriptors count
test [device.tx_free_des], -1
jz .end
dec [device.tx_free_des]
.end:
status
DEBUGF 1,"transmit ok\n"
xor eax, eax
stdcall KernelFree, [esp+4]
ret 8
.fail:
DEBUGF 1,"transmit failed\n"
or eax, -1
stdcall KernelFree, [esp+4]
ret 8
;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Interrupt handler ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;
align 4
int_handler:
DEBUGF 1,"\n%s int\n", my_service
; find pointer of device wich made IRQ occur
mov ecx, [devices]
test ecx, ecx
jz .nothing
mov esi, device_list
.nextdevice:
mov ebx, [esi]
set_io 0
set_io CSR5
in eax, dx
out dx, eax ; send it back to ACK
test eax, eax
jnz .got_it
.continue:
add esi, 4
dec ecx
jnz .nextdevice
.nothing:
ret ; If no device was found, abort (The irq was probably for a device, not registered to this driver)
.got_it:
DEBUGF 1,"Device: %x CSR5: %x ", ebx, ax
;----------------------------------
; TX ok?
test ax, CSR5_TI
jz .not_tx
push ax esi ecx
DEBUGF 1,"TX ok!\n"
; go to current descriptor
mov edi, [device.tx_p_des]
mov eax, [device.tx_rd_des]
mov edx, DES.size
mul edx
add edi, eax
.loop_tx:
; done if all desc are free
cmp [device.tx_free_des], TX_DES_COUNT
jz .end_tx
mov eax, [edi+DES.status]
; we stop at first desc that is owned be NIC
test eax, DES0_OWN
jnz .end_tx
; detect is setup packet
cmp eax, (0ffffffffh - DES0_OWN) ; all other bits are 1
jne .not_setup_packet
DEBUGF 1,"Setup Packet detected\n"
.not_setup_packet:
DEBUGF 1,"packet status: %x\n", eax
; next descriptor
add edi, DES.size
inc [device.tx_rd_des]
and [device.tx_rd_des], TX_DES_COUNT-1
; inc free desc
inc [device.tx_free_des]
cmp [device.tx_free_des], TX_DES_COUNT
jbe @f
mov [device.tx_free_des], TX_DES_COUNT
@@:
jmp .loop_tx
.end_tx:
;------------------------------------------------------
; here must be called standard Ethernet Tx Irq Handler
;------------------------------------------------------
pop ecx esi ax
;----------------------------------
; RX irq
.not_tx:
test ax, CSR5_RI
jz .not_rx
push ax esi ecx
DEBUGF 1,"RX ok!\n"
push ebx
.rx_loop:
pop ebx
; get current descriptor
mov edi, [device.rx_p_des]
mov eax, [device.rx_crt_des]
mov edx, DES.size
mul edx
add edi, eax
; now check status
mov eax, [edi + DES.status]
test eax, DES0_OWN
jnz .end_rx ; current desc is busy, nothing to do
test eax, RDES0_FS
jz .end_rx ; current desc is NOT first packet, ERROR!
test eax, RDES0_LS ; if not last desc of packet, error for now
jz .end_rx
test eax, RDES0_ES
jnz .end_rx
mov esi, [edi + DES.virtaddr]
mov ecx, [edi + DES.status]
shr ecx, RDES0_FL_SH
and ecx, RDES0_FL_MASK
sub ecx, 4 ; crc, we dont need it
DEBUGF 1,"Received packet!, size=%u, addr:%x\n", ecx, esi
push esi edi ecx
stdcall KernelAlloc, ecx ; Allocate a buffer to put packet into
pop ecx edi esi
test eax, eax
jz .fail
push ebx
push dword .rx_loop
push ecx eax
mov edi, eax
; update statistics
inc [device.packets_rx]
add dword [device.bytes_rx], ecx
adc dword [device.bytes_rx + 4], 0
; copy packet data
shr cx , 1
jnc .nb
movsb
.nb:
shr cx , 1
jnc .nw
movsw
.nw:
rep movsd
mov [edi + DES.status], DES0_OWN ; free descriptor
inc [device.rx_crt_des] ; next descriptor
and [device.rx_crt_des], RX_DES_COUNT-1
jmp Eth_input
.end_rx:
.fail:
pop ecx esi ax
.not_rx:
jmp .continue
align 4
write_mac: ; in: mac pushed onto stack (as 3 words)
DEBUGF 2,"Writing MAC: "
; write data into driver cache
mov esi, esp
lea edi, [device.mac]
movsd
movsw
add esp, 6
; send setup packet (only if driver is started)
call Send_Setup_Packet
align 4
read_mac:
DEBUGF 1,"Read_mac\n"
ret
align 4
read_mac_eeprom:
DEBUGF 1,"Read_mac_eeprom\n"
lea edi, [device.mac]
mov esi, 20/2 ; read words, start address is 20
.loop:
push esi edi
call SROM_Read_Word
pop edi esi
stosw
inc esi
cmp esi, 26/2
jb .loop
DEBUGF 2,"%x-%x-%x-%x-%x-%x\n",[edi-6]:2,[edi-5]:2,[edi-4]:2,[edi-3]:2,[edi-2]:2,[edi-1]:2
ret
align 4
write_mac_eeprom:
DEBUGF 1,"Write_mac_eeprom\n"
ret
align 4
SROM_GetWidth: ; should be 6 or 8 according to some manuals (returns in ecx)
DEBUGF 1,"SROM_GetWidth\n"
call SROM_Idle
call SROM_EnterAccessMode
; set_io 0
; set_io CSR9
; send 110b
in eax, dx
or eax, CSR9_SROM_DI
call SROM_out
in eax, dx
or eax, CSR9_SROM_DI
call SROM_out
in eax, dx
and eax, not (CSR9_SROM_DI)
call SROM_out
mov ecx,1
.loop2:
Bit_Set CSR9_SROM_CK
SROM_Delay
in eax, dx
and eax, CSR9_SROM_DO
jnz .not_zero
Bit_Clear CSR9_SROM_CK
SROM_Delay
jmp .end_loop2
.not_zero:
Bit_Clear CSR9_SROM_CK
SROM_Delay
inc ecx
cmp ecx, 12
jbe .loop2
.end_loop2:
DEBUGF 1,"Srom width=%u\n", ecx
call SROM_Idle
call SROM_EnterAccessMode
call SROM_Idle
ret
align 4
SROM_out:
out dx, eax
SROM_Delay
Bit_Set CSR9_SROM_CK
SROM_Delay
Bit_Clear CSR9_SROM_CK
SROM_Delay
ret
align 4
SROM_EnterAccessMode:
DEBUGF 1,"SROM_EnterAccessMode\n"
set_io 0
set_io CSR9
mov eax, CSR9_SR
out dx, eax
SROM_Delay
Bit_Set CSR9_RD
SROM_Delay
Bit_Clear CSR9_SROM_CK
SROM_Delay
Bit_Set CSR9_SROM_CS
SROM_Delay
ret
align 4
SROM_Idle:
DEBUGF 1,"SROM_Idle\n"
call SROM_EnterAccessMode
; set_io 0
; set_io CSR9
mov ecx, 25
.loop_clk:
Bit_Clear CSR9_SROM_CK
SROM_Delay
Bit_Set CSR9_SROM_CK
SROM_Delay
dec ecx
jnz .loop_clk
Bit_Clear CSR9_SROM_CK
SROM_Delay
Bit_Clear CSR9_SROM_CS
SROM_Delay
xor eax, eax
out dx, eax
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Read serial EEprom word ;;
;; ;;
;; In: esi = read address ;;
;; OUT: ax = data word ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 4
SROM_Read_Word:
DEBUGF 1,"SROM_Read_word at: %x result: ", esi
set_io 0
set_io CSR9
; enter access mode
mov eax, CSR9_SR + CSR9_RD
out dx , eax
or eax, CSR9_SROM_CS
out dx , eax
; TODO: change this hard-coded 6-bit stuff to use value from srom_getwidth
; send read command "110b" + address to read from
and esi, 111111b
or esi, 110b shl 6
mov ecx, 1 shl 9
.loop_cmd:
mov eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS
test esi, ecx
jz @f
or eax, CSR9_SROM_DI
@@:
out dx , eax
SROM_Delay
or eax, CSR9_SROM_CK
out dx , eax
SROM_Delay
shr ecx, 1
jnz .loop_cmd
; read data from SROM
xor esi, esi
mov ecx, 17 ;;; TODO: figure out why 17, not 16
.loop_read:
mov eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS + CSR9_SROM_CK
out dx , eax
SROM_Delay
in eax, dx
and eax, CSR9_SROM_DO
shr eax, 3
shl esi, 1
or esi, eax
mov eax, CSR9_SR + CSR9_RD + CSR9_SROM_CS
out dx , eax
SROM_Delay
dec ecx
jnz .loop_read
mov eax, esi
DEBUGF 1,"%x\n", ax
ret
;<<<<<<<<<<<<<<<<<<<<<<<<<<<<
;*********************************************************************
;* Media Descriptor Code *
;*********************************************************************
; MII transceiver control section.
; Read and write the MII registers using software-generated serial
; MDIO protocol. See the MII specifications or DP83840A data sheet
; for details.
; The maximum data clock rate is 2.5 Mhz. The minimum timing is usually
; met by back-to-back PCI I/O cycles, but we insert a delay to avoid
; "overclocking" issues or future 66Mhz PCI.
; Read and write the MII registers using software-generated serial
; MDIO protocol. It is just different enough from the EEPROM protocol
; to not share code. The maxium data clock rate is 2.5 Mhz.
MDIO_SHIFT_CLK = 0x10000
MDIO_DATA_WRITE0 = 0x00000
MDIO_DATA_WRITE1 = 0x20000
MDIO_ENB = 0x00000 ; Ignore the 0x02000 databook setting.
MDIO_ENB_IN = 0x40000
MDIO_DATA_READ = 0x80000
; MII transceiver control section.
; Read and write the MII registers using software-generated serial
; MDIO protocol. See the MII specifications or DP83840A data sheet
; for details.
align 4
mdio_read: ; phy_id:edx, location:esi
DEBUGF 1,"mdio read, phy=%x, location=%x", edx, esi
shl edx, 5
or esi, edx
or esi, 0xf6 shl 10
set_io 0
set_io CSR9
; if (tp->chip_id == LC82C168) {
; int i = 1000;
; outl(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
; inl(ioaddr + 0xA0);
; inl(ioaddr + 0xA0);
; while (--i > 0)
; if ( ! ((retval = inl(ioaddr + 0xA0)) & 0x80000000))
; return retval & 0xffff;
; return 0xffff;
; }
;
; if (tp->chip_id == COMET) {
; if (phy_id == 1) {
; if (location < 7)
; return inl(ioaddr + 0xB4 + (location<<2));
; else if (location == 17)
; return inl(ioaddr + 0xD0);
; else if (location >= 29 && location <= 31)
; return inl(ioaddr + 0xD4 + ((location-29)<<2));
; }
; return 0xffff;
; }
; Establish sync by sending at least 32 logic ones.
mov ecx, 32
.loop:
mov eax, MDIO_ENB or MDIO_DATA_WRITE1
out dx, eax
MDIO_Delay
or eax, MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
dec ecx
jnz .loop
; Shift the read command bits out.
mov ecx, 1 shl 15
.loop2:
mov eax, MDIO_ENB
test esi, ecx
jz @f
or eax, MDIO_DATA_WRITE1
@@:
out dx, eax
MDIO_Delay
or eax, MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
shr ecx, 1
jnz .loop2
; Read the two transition, 16 data, and wire-idle bits.
xor esi, esi
mov ecx, 19
.loop3:
mov eax, MDIO_ENB_IN
out dx, eax
MDIO_Delay
shl esi, 1
in eax, dx
test eax, MDIO_DATA_READ
jz @f
inc esi
@@:
mov eax, MDIO_ENB_IN or MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
dec ecx
jnz .loop3
shr esi, 1
movzx eax, si
DEBUGF 1,", data=%x\n", ax
ret
align 4
mdio_write: ;int phy_id: edx, int location: edi, int value: ax)
DEBUGF 1,"mdio write, phy=%x, location=%x, data=%x\n", edx, edi, ax
shl edi, 18
or edi, 0x5002 shl 16
shl edx, 23
or edi, edx
mov di, ax
set_io 0
set_io CSR9
; if (tp->chip_id == LC82C168) {
; int i = 1000;
; outl(cmd, ioaddr + 0xA0);
; do
; if ( ! (inl(ioaddr + 0xA0) & 0x80000000))
; break;
; while (--i > 0);
; return;
; }
; if (tp->chip_id == COMET) {
; if (phy_id != 1)
; return;
; if (location < 7)
; outl(value, ioaddr + 0xB4 + (location<<2));
; else if (location == 17)
; outl(value, ioaddr + 0xD0);
; else if (location >= 29 && location <= 31)
; outl(value, ioaddr + 0xD4 + ((location-29)<<2));
; return;
; }
; Establish sync by sending at least 32 logic ones.
mov ecx, 32
.loop:
mov eax, MDIO_ENB or MDIO_DATA_WRITE1
out dx, eax
MDIO_Delay
or eax, MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
dec ecx
jnz .loop
; Shift the command bits out.
mov ecx, 1 shl 31
.loop2:
mov eax, MDIO_ENB
test edi, ecx
jz @f
or eax, MDIO_DATA_WRITE1
@@:
out dx, eax
MDIO_Delay
or eax, MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
shr ecx, 1
jnz .loop2
; Clear out extra bits.
mov ecx, 2
.loop3:
mov eax, MDIO_ENB
out dx, eax
MDIO_Delay
or eax, MDIO_SHIFT_CLK
out dx, eax
MDIO_Delay
dec ecx
jnz .loop3
ret
; End of code
align 4 ; Place all initialised data here
devices dd 0
version dd (DRIVER_VERSION shl 16) or (API_VERSION and 0xFFFF)
my_service db 'DEC21X4X',0 ; max 16 chars include zero
include_debug_strings ; All data wich FDO uses will be included here
section '.data' data readable writable align 16 ; place all uninitialized data place here
device_list rd MAX_DEVICES ; This list contains all pointers to device structures the driver is handling