C/C++ User's Journal & Wi…eveloper's Journal Tools/C-C__Users_Journal_and_Windows_Developers_Journal_Tools_1997.iso/gsidemo/tail.asm

Assembly Source File | 1994-09-29 | 17.0 KB | 680 lines

;   PC/FTP Packet Driver source, conforming to version 1.05 of the spec
;   Updated to version 1.08 Feb. 17, 1989.
;   Copyright 1988-1993 Russell Nelson

;   This program is free software; you can redistribute it and/or modify
;   it under the terms of the GNU General Public License as published by
;   the Free Software Foundation, version 1.
;
;   This program is distributed in the hope that it will be useful,
;   but WITHOUT ANY WARRANTY; without even the implied warranty of
;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;   GNU General Public License for more details.
;
;   You should have received a copy of the GNU General Public License
;   along with this program; if not, write to the Free Software
;   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    include    defs.asm

code    segment word public
    assume    cs:code, ds:code

    public    is_eisa
is_eisa    db    0            ;=0 if ISA, =1 if EISA
    extrn    sys_features: byte    ;bitmask of system features.
    extrn    is_186: byte        ;=0 if 808[68], =1 if 80[1234]86.
    extrn    is_286: byte        ;=0 if 80[1]8[68], =1 if 80[234]86.
    extrn    is_386: byte        ;=0 if 80[12]8[68], =1 if 80[34]86.
    extrn    int_no: byte        ;the board's interrupt level.
    extrn    hw_int_no: byte        ;the 8259 interrupt level.
    extrn    driver_class: byte    ;the class of this driver, per the spec.
    extrn    rcv_modes: word        ;count of modes followed by mode handles.

;-> last byte of static memory used by driver-dependent code.
    extrn    end_resident: byte
    extrn    end_free_mem: byte

;-> the fixed address of the card.
    extrn    rom_address: byte

;-> the current address of the card.
    extrn    my_address: byte

    extrn    phd_dioa: byte
    extrn    phd_environ: word
    extrn    flagbyte: byte

    include    printnum.asm
    include    decout.asm
    include    digout.asm
    include    crlf.asm
    include    chrout.asm

free_mem    dw    end_resident    ;allocate memory from here.
;also see memory_to_keep.

    public    malloc
malloc:
;enter with dx = amount of memory desired.
;exit with nc, dx -> that memory, or cy if there isn't enough memory.
    add    dx,free_mem        ;make a pointer after that much memory.
    cmp    dx,offset end_free_mem    ;is it still in the free area?
    ja    malloc_1        ;no, we're in trouble.
    xchg    dx,free_mem        ;get the pointer back, store ptr->end.
    clc
    ret
malloc_1:
    stc
    ret


end_tail_1    label    byte        ; end of the delayed init driver

;usage_msg is of the form "usage: driver [options] <packet_int_no> <args>"
    extrn    usage_msg: byte

options_i_msg    label    byte
db"   -i -- Force driver to report itself as IEEE 802.3 instead of Ethernet II.",CR,LF
options_msg    label    byte
db"   -d -- Delayed initialization.  Used for diskless booting",CR,LF
db"   -n -- NetWare conversion.  Converts 802.3 packets into 8137 packets",CR,LF
db"   -w -- Windows hack, obsoleted by winpkt",CR,LF
db"   -p -- Promiscuous mode disable",CR,LF
db"   -u -- Uninstall",CR,LF
db '$'

;copyright_msg is of the form:
;"Packet driver for the foobar",CR,LF
;"Portions Copyright 19xx, J. Random Hacker".
    extrn    copyright_msg: byte

copyleft_msg    label    byte
 db "Packet driver skeleton copyright 1988-93, Crynwr Software.",CR,LF
 db "This program is freely copyable; source must be available; NO WARRANTY.",CR,LF
 db "See the file COPYING.DOC for details; send FAX to [phone] for a copy.",CR,LF
 db CR,LF,'$'

no_resident_msg    label    byte
 db CR,LF,"*** Packet driver failed to initialize the board ***",CR,LF,'$'

;parse_args should parse the arguments.
;called with ds:si -> immediately after the entry_point.
    extrn    parse_args: near

;print_parameters should print the arguments.
    extrn    print_parameters: near

    extrn    our_isr: near, their_isr: dword
    extrn    entry_point: byte

eisa_signature    db    "EISA"

system_msg    db    "System: ",'$'
i386_msg    db    "[345]86 processor",'$'
i286_msg    db    "286 processor",'$'
i186_msg    db    "186 processor",'$'
i8088_msg    db    "8088/8086 processor",'$'
mca_msg        db    ", Microchannel bus",'$'
eisa_msg    db    ", EISA bus",'$'
isa_msg        db    ", ISA bus",'$'
two_8259_msg    db    ", Two 8259s",'$'
entry_point_name    db    "Packet driver software interrupt is ",'$'
eaddr_msg    db    "My Ethernet address is ",'$'
aaddr_msg    db    "My ARCnet address is ",'$'

already_msg    db    CR,LF,"Error: there is already a packet driver (you may uninstall it using -u) at ",'$'
no_pkint_msg    db    CR,LF,"Error: there is no packet driver at ",'$'
no_pkt_msg    db    CR,LF,"Error: no packet driver found between 0x60 and 0x80",CR,LF,'$'
two_pkts_msg    db    CR,LF,"Error: there are two packets drivers (specify the desired one after -u).",CR,LF,'$'
int_msg        db    CR,LF
        db    "Error: <hardware_irq> should be between 0 and "
int_msg_num    label    word
        db    "15 inclusive", '$'
xt_hd_warn_msg    db    CR,LF,"Warning: the hard disk on an XT usually uses IRQ 5.  Use a different interrupt",CR,LF,'$'
no_ieee_msg    db    CR,LF,"Error: this driver doesn't implement both IEEE 802.3 and Ethernet II",CR,LF,'$'
terminated_msg    db    "Uninstall completed",'$'

handle        dw    ?

entry_point_fnd    db    0
bogus_type    db    0,0        ;totally bogus type code.
our_recv:
    xor    di,di
    mov    es,di
    retf

    public    etopen_diagn
etopen_diagn    db    0        ; errorlevel from etopen if set

;etopen should initialize the device.  If it needs to give an error, it
;can issue the error message and quit to dos.
    extrn    etopen: near

memory_to_keep    dw    end_resident    ;keep at least this much memory.
;also see free_mem.

already_error:
    mov    dx,offset already_msg
already_error_1:
    mov    di,offset entry_point
    call    print_number
    mov    ax,4c05h        ; give errorlevel 5
    int    21h

usage_error:
    mov    dx,offset usage_msg
    mov    ah,9
    int    21h
    mov    dx,offset options_msg
    cmp    word ptr driver_class,BLUEBOOK + IEEE8023*256    ;both present?
    jne    error
    mov    dx,offset options_i_msg
    public    error
error:
    mov    ah,9
    int    21h
    mov    ax,4c0ah        ; give errorlevel 10
    int    21h

;;;    include    timeout.asm

    public    start_1
start_1:
    cld

;** First, print a few welcoming messages.

    mov    dx,offset copyright_msg
    mov    ah,9
    int    21h

    mov    dx,offset copyleft_msg
    mov    ah,9
    int    21h

    mov    dx,offset branding_msg
    mov    ah,9
    int    21h

;** Identify the bus type (EISA, 8-bit ISA, 16-bit ISA, MCA)

    mov    dx,0f000h        ;ROM segment
    mov    es,dx
    mov    di,0ffd9h
    mov    si,offset eisa_signature
    mov    cx,2
    repe    cmpsw
    jne    not_eisa
    inc    is_eisa
not_eisa:

;
; Get the feature byte (if reliable) so we can know if it is a microchannel
; computer and how many interrupts there are.
;
    mov    ah,0c0h
    int    15h            ; es:bx <- sys features block
    jc    look_in_ROM        ; error, must use rom.
    or    ah,ah
    jnz    look_in_ROM
    mov    dx,es:[bx]        ; # of feature bytes
    cmp    dx,4            ; do we have the feature byte we want?
    jae    got_features        ;yes.
look_in_ROM:
    cmp    byte ptr es:[0fffeh],0fch;is this an AT?
    jne    identified        ;no.
    or    sys_features,TWO_8259    ; ATs have 2nd 8259
    jmp    short identified    ; assume no microchannel
got_features:
    mov    ah,es:[bx+2]        ; model byte
    cmp    ah,0fch
    je    at_ps2
    ja    identified        ; FD, FE and FF are not ATs
    cmp    ah,0f8h
    je    at_ps2
    ja    identified        ; F9, FA and FB are not ATs
    cmp    ah,09ah
    jbe    identified        ; old non-AT Compacs go here
at_ps2:                    ; 9B - F8 and FC are assumed to
    mov    ah,es:[bx+5]        ;   have reliable feature byte
    mov    sys_features,ah
identified:

;** Identify which processor we're running on.

;Determine the processor type.  The 8088 and 8086 will actually shift ax
;over by 33 bits, while the 80[123]86 use a shift count mod 32.
    mov    cl,33
    mov    ax,0ffffh
    shl    ax,cl            ;186 or better?
    jz    processor_identified    ;no.
    mov    is_186,1

    push    sp
    pop    ax
    cmp    ax,sp            ;286 or better?
    jne    processor_identified    ;no.
    mov    is_286,1

    pushf
    pop    ax
    or    ax,7000h        ;the 386 lets us set these bits
    push    ax
    popf                ;this should be a real popf.
    pushf
    pop    ax
    test    ax,7000h        ;did the bits get set?
    je    processor_identified
    mov    is_386,1

processor_identified:

;** Parse the command line.

    mov    si,offset phd_dioa+1
    call    skip_blanks        ;end of line?
    cmp    al,CR
    je    usage_error_j_1

chk_options:

;** Look for -<single-letter> options.

    call    skip_blanks
    cmp    al,'-'            ; any options?
    jne    no_more_opt
    inc    si            ; skip past option char
    lodsb                ; read next char
    or    al,20h            ; convert to lower case
    cmp    al,'d'
    jne    not_d_opt
    or    flagbyte,D_OPTION
    jmp    chk_options
not_d_opt:
    cmp    al,'n'
    jne    not_n_opt
    or    flagbyte,N_OPTION
    jmp    chk_options
not_n_opt:
    cmp    al,'w'
    jne    not_w_opt
    or    flagbyte,W_OPTION
    jmp    chk_options
not_w_opt:
    cmp    al,'p'
    jne    not_p_opt
    cmp    rcv_modes,6        ;do they even *have* a promiscuous mode?
    jbe    chk_options        ;no.
    mov    rcv_modes+2[6*2],0    ;yes, nuke it.
    jmp    chk_options
not_p_opt:
    cmp    al,'u'
    jne    not_u_opt
    or    flagbyte,U_OPTION
    jmp    chk_options
not_u_opt:
    cmp    al,'i'
    jne    not_i_opt
    cmp    word ptr driver_class,BLUEBOOK + IEEE8023*256    ;both present?
    mov    dx,offset no_ieee_msg
    jne    usage_error_j_1        ;no - give error
    mov    word ptr driver_class,IEEE8023 + BLUEBOOK*256    ;yes, swap them.
    jmp    chk_options
not_i_opt:
usage_error_j_1:
    jmp    usage_error
no_more_opt:

;** get the packet driver interrupt number.

    mov    di,offset entry_point    ;parse the packet interrupt number
    call    get_number        ;  for them.

;** see if they wanted to terminate the existing driver.

    test    flagbyte,U_OPTION    ;should we terminate the driver?
    jne    terminate
    jmp    not_terminate
terminate:

    cmp    entry_point,0        ;did they ask for the default?
    jne    terminate_int_ok    ;no, run with it.

;**Look for the existing packet driver interrupt

    mov    entry_point,60h
terminate_check_int:
    call    verify_packet_int
    jc    terminate_check_int_1
    jne    terminate_check_int_1
    cmp    entry_point_fnd,0    ;did we already find one?
    jne    terminate_check_int_2    ;yes, it's ambiguous - give error.
    mov    al,entry_point        ;no, remember it.
    mov    entry_point_fnd,al
terminate_check_int_1:
    inc    entry_point        ;go look at the next one
    cmp    entry_point,80h
    jbe    terminate_check_int    ;keep going to the end.

    mov    al,entry_point_fnd    ;restore the last one found.
    mov    entry_point,al
    cmp    entry_point_fnd,0    ;did we find one?
    jne    terminate_int_ok    ;yes.
    mov    dx,offset no_pkt_msg    ;no packet drivers installed!
    jmp    error
terminate_check_int_2:
    mov    dx,offset two_pkts_msg    ;two packet drivers - which one??
    jmp    error

terminate_int_ok:
    call    verify_packet_int    ;is the one they specified acceptable?
    jnc    terminate_1        ;no, it's not in range.
    jmp    error
terminate_1:
    je    terminate_2        ;go if we found a signature.
    mov    dx,offset no_pkint_msg    ;no packet driver there.
    jmp    already_error_1
terminate_2:

    mov    their_isr.offs,bx
    mov    their_isr.segm,es

    mov    ax,1ffh            ;driver_info
    pushf
    cli
    call    their_isr
    call    fatal_error
    movseg    ds,cs

    mov    ah,2            ;access_type
    mov    al,ch            ;their class from driver_info().
    mov    bx,dx            ;their type from driver_info().
    mov    dl,cl            ;their number from driver_info().
    mov    cx,2            ;use type length 2.
    mov    si,offset bogus_type
    movseg    es,cs
    mov    di,offset our_recv
    pushf
    cli
    call    their_isr
    call    fatal_error
    mov    handle,ax

    mov    ah,5            ;terminate the driver.
    mov    bx,handle
    pushf
    cli
    call    their_isr
    jnc    now_close
    call    print_error

    mov    ah,3            ;release_type
    mov    bx,handle
    pushf
    cli
    call    their_isr
    int    20h
now_close:
    mov    dx,offset terminated_msg
    mov    ah,9
    int    21h
    int    20h

usage_error_j_2:
    jmp    usage_error
not_terminate:

;** ask the driver to parse any remaining parameters.

    call    parse_args
    jc    usage_error_j_2

    call    skip_blanks        ;end of line?
    cmp    al,CR
    jne    usage_error_j_2

    call    verify_packet_int
    jnc    packet_int_ok
    jmp    error
packet_int_ok:
    jne    packet_int_unused
    jmp    already_error        ;give an error if there's one there.
packet_int_unused:

;** Verify that the hardware interrupt number they gave is valid.

    cmp    int_no,15        ;can't possibly be > 15.
    ja    int_bad
    test    sys_features,TWO_8259    ; 2nd 8259 ?
    jnz    int_ok            ;yes, no need to check for <= 7.
    mov    int_msg_num,'7'+' '*256    ;correct the error message, just in case.
    cmp    int_no,7        ;make sure that the packet interrupt
    jbe    int_ok_7        ;  number is in range.
int_bad:
    mov    dx,offset int_msg
    jmp    error
int_ok_7:

;** IRQ 5 on an XT is not available -- it's used by the hard disk.
    cmp    int_no,5        ;Are they trying to use irq 5 on an XT?
    jne    int_ok            ;no.

    push    ds
    mov    ax,40h
    mov    ds,ax
    mov    al,ds:[75h]        ;get the number of hard disks.
    pop    ds

    or    al,al            ;do they have one?
    je    int_ok            ;unbelievably, no.
    mov    dx,offset xt_hd_warn_msg
    mov    ah,9
    int    21h
int_ok:

;
; Map IRQ 2 to IRQ 9 if needed.
;
    test    sys_features,TWO_8259    ; 2nd 8259 ?
    je    no_mapping_needed    ;no, no mapping needed
    cmp    int_no,2        ;map IRQ 2 to IRQ 9.
    jne    no_mapping_needed
    mov    int_no,9
no_mapping_needed:

; If they chose the -d option, don't call etopen when we are loaded,
; but when we are called for the first time
;
; Save part of the tail, needed by delayed etopen
    test    flagbyte,D_OPTION
    jz    open_now
    mov    memory_to_keep,offset end_tail_1    ; save first part of tail
    jmp    delayed_open_1
open_now:
    call    etopen            ;init the driver.  If any errors,
                    ;this routine returns cy.
    jnc    yes_resident
    jmp    no_resident

yes_resident:

;** etopen has set rom_address to their hardware address.  Set our copy of
;** the current address.

    mov    si,offset rom_address    ;copy their original address to
    movseg    es,ds
    mov    di,offset my_address    ;  their current address.
    mov    cx,MAX_ADDR_LEN/2
    rep    movsw

;** tell them what kind of system they have.
    mov    dx,offset system_msg
    mov    ah,9
    int    21h

    mov    dx,offset i386_msg
    cmp    is_386,0
    jne    have_processor
    mov    dx,offset i286_msg
    cmp    is_286,0
    jne    have_processor
    mov    dx,offset i186_msg
    cmp    is_186,0
    jne    have_processor
    mov    dx,offset i8088_msg
have_processor:
    mov    ah,9
    int    21h

    mov    dx,offset mca_msg
    test    sys_features,SYS_MCA
    jne    have_bus
    mov    dx,offset eisa_msg
    cmp    is_eisa,0
    jne    have_bus
    mov    dx,offset isa_msg
have_bus:
    mov    ah,9
    int    21h

    test    sys_features,TWO_8259
    je    only_one_8259
    mov    dx,offset two_8259_msg
    mov    ah,9
    int    21h
only_one_8259:

    call    crlf

    mov    di,offset entry_point
    mov    dx,offset entry_point_name
    call    print_number

    call    print_parameters    ;echo our parameters.
    or    flagbyte,CALLED_ETOPEN

    cmp    driver_class,BLUEBOOK    ;Blue Book Ethernet?
    je    print_eaddr        ;yes.
    cmp    driver_class,IEEE8023    ;IEEE 802.3 Ethernet?
    jne    print_addr_2        ;no, don't print what we don't have.

print_eaddr:
    mov    dx,offset eaddr_msg
    mov    ah,9
    int    21h

    mov    si,offset rom_address
    call    print_ether_addr

    call    crlf

print_addr_2:

    cmp    driver_class,8        ;ARCnet?
    jne    print_addr_3        ;no, don't print what we don't have.

    mov    dx,offset aaddr_msg
    mov    ah,9
    int    21h

    mov    al,rom_address
    mov    cl,' '            ;Don't eliminate leading zeroes.
    call    byteout

    call    crlf

print_addr_3:
delayed_open_1:

;** Take care of installing ourselves in memory.

    mov    ah,35h            ;remember their packet interrupt.
    mov    al,entry_point
    int    21h
    mov    their_isr.offs,bx
    mov    their_isr.segm,es

    mov    ah,25h            ;install our packet interrupt
    mov    dx,offset our_isr
    int    21h

    mov    ah,49h            ;free our environment, because
    mov    es,phd_environ        ;  we won't need it.
    int    21h

    mov    bx,1            ;get the stdout handle.
    mov    ah,3eh            ;close it in case they redirected it.
    int    21h

    test    flagbyte,D_OPTION
    jne    f_release_type_1    ;no.
    cmp    rcv_modes+2[3*2],0    ;does mode 3 exist?
    je    f_release_type_1    ;no.
    call    rcv_modes+2[3*2]    ;  call it.
f_release_type_1:

    mov    dx,memory_to_keep    ;keep the greater of this and
    cmp    dx,free_mem        ;  free_mem.
    jae    go_resident
    mov    dx,free_mem
go_resident:
    add    dx,0fh            ;round up to next highest paragraph.
    mov    cl,4
    shr    dx,cl
    mov    ah,31h            ;terminate, stay resident.
    mov    al,etopen_diagn        ; errorlevel (0 - 9, just diagnostics)
    int    21h

no_resident:
    mov    ah,9            ;print their error message.
    int    21h

    mov    dx,offset no_resident_msg
    mov    ah,9
    int    21h

    mov    ax,4c00h + 32        ; give errorlevel 32
    cmp    al,etopen_diagn
    ja    no_et_diagn        ; etopen gave specific reason?
    mov    al,etopen_diagn        ; yes, use that for error level
no_et_diagn:
    int    21h

;             Suggested errorlevels:
;
; _____________________  0 = normal
;              1 = unsuitable memory address given; corrected
; In most cases every-     2 = unsuitable IRQ level given; corrected
; thing should work as     3 = unsuitable DMA channel given; corrected
; expected for lev 1-5     4 = unsuitable IO addr given; corrected (only 1 card)
; _____________________     5 = packet driver for this int # already loaded
; External errors, when    20 = general cable failure (but pkt driver is loaded)
; corrected normal    21 = network cable is open             -"-
; operation starts    22 = network cable is shorted          -"-
; _____________________ 23 =
; Packet driver not    30 = usage message
; loaded. A new load    31 = arguments out of range
; attempt must be done    32 = unspecified device initialization error
;            33 =
;            34 = suggested memory already occupied
;            35 = suggested IRQ already occupied
;            36 = suggested DMA channel already occupied
;            37 = could not find the network card at this IO address


    include    verifypi.asm
    include    getnum.asm
    include    getdig.asm
    include    skipblk.asm
    include    printea.asm
    include    pkterr.asm
    include    getenv.asm

    public    branding_msg
branding_msg    db    '$'

code    ends

    end