emailler/client/ip65/function_dispatcher.s

347 lines
6.2 KiB
ArmAsm

;this is some very quick and dirty glue to make the most useful IP65 functions available via a single entry point.
;this allows user applications to be developed that don't link ip65 in directly, rather they use an instance of ip65 that is preloaded (or in a cartridge/ROM)
;this whole file could (and should) be greatly optimised by making it all table driven, but since this file is probably only going to be used in a bankswitched ROM where
;space is not at such a premium, I'll go with the gross hack for now.
.ifndef NB65_API_VERSION_NUMBER
.define EQU =
.include "../inc/nb65_constants.i"
.endif
.include "../inc/common.i"
.include "../inc/commonprint.i"
.export nb65_dispatcher
.import ip65_init
.import dhcp_init
.import cfg_get_configuration_ptr
.import tftp_load_address
.importzp tftp_filename
.import tftp_ip
.import tftp_directory_listing
.import ip65_error
.import tftp_clear_callbacks
.import tftp_download
.import tftp_set_callback_vector
.import dns_ip
.import dns_resolve
.import dns_set_hostname
.import udp_callback
.import udp_add_listener
.import ip_inp
.import udp_inp
.import udp_send
.import udp_send_src
.import udp_send_src_port
.import udp_send_dest
.import udp_send_dest_port
.import udp_send_len
.import copymem
.import cfg_mac
.importzp copy_src
.importzp copy_dest
;reuse the copy_src zero page location
nb65_params = copy_src
.data
old_ax: .res 2
jmp_old_irq:
jmp $0000
irq_handler_installed_flag:
.byte 0
.code
irq_handler:
jsr NB65_VBL_VECTOR
jmp jmp_old_irq
set_tftp_params:
ldy #NB65_TFTP_IP
lda (nb65_params),y
sta tftp_ip
iny
lda (nb65_params),y
sta tftp_ip+1
iny
lda (nb65_params),y
sta tftp_ip+2
iny
lda (nb65_params),y
sta tftp_ip+3
ldy #NB65_TFTP_FILENAME
lda (nb65_params),y
sta tftp_filename
iny
lda (nb65_params),y
sta tftp_filename+1
ldy #NB65_TFTP_POINTER
lda (nb65_params),y
sta tftp_load_address
iny
lda (nb65_params),y
sta tftp_load_address+1
jsr tftp_clear_callbacks
rts
nb65_dispatcher:
stax nb65_params
stax old_ax
cpy #NB65_INITIALIZE
bne :+
lda irq_handler_installed_flag
bne irq_handler_installed
;install our IRQ handler
ldax $314 ;previous IRQ handler
stax jmp_old_irq+1
sei ;don't want any interrupts while we fiddle with the vector
ldax #irq_handler
stax $314 ;previous IRQ handler
cli
sta irq_handler_installed_flag
jsr ip65_init
jmp dhcp_init
irq_handler_installed:
clc
rts
:
cpy #NB65_GET_IP_CONFIG
bne :+
ldax #cfg_mac
clc
rts
:
cpy #NB65_TFTP_DIRECTORY_LISTING
bne :+
jsr set_tftp_params
jsr tftp_directory_listing
@after_tftp_call: ;write the current load address back to the param buffer (so if $0000 was passed in, the caller can find out the actual value used)
bcs @tftp_error
ldax old_ax
stax nb65_params
ldy #NB65_TFTP_POINTER
lda tftp_load_address
sta (nb65_params),y
iny
lda tftp_load_address+1
sta (nb65_params),y
clc
@tftp_error:
@dns_error:
rts
:
cpy #NB65_TFTP_DOWNLOAD
bne :+
jsr set_tftp_params
jsr tftp_download
jmp @after_tftp_call
:
cpy #NB65_DNS_RESOLVE
bne :+
ldy #NB65_DNS_HOSTNAME+1
lda (nb65_params),y
tax
dey
lda (nb65_params),y
jsr dns_set_hostname
bcs @dns_error
jsr dns_resolve
bcs @dns_error
ldy #NB65_DNS_HOSTNAME_IP
ldx #4
@copy_dns_ip:
lda dns_ip,y
sta (nb65_params),y
iny
dex
bne @copy_dns_ip
rts
:
cpy #NB65_UDP_ADD_LISTENER
bne :+
ldy #NB65_UDP_LISTENER_CALLBACK
lda (nb65_params),y
sta udp_callback
iny
lda (nb65_params),y
sta udp_callback+1
ldy #NB65_UDP_LISTENER_PORT+1
lda (nb65_params),y
tax
dey
lda (nb65_params),y
jmp udp_add_listener
:
cpy #NB65_GET_INPUT_PACKET_INFO
bne :+
ldy #3
@copy_src_ip:
lda ip_inp+12,y ;src IP
sta (nb65_params),y
dey
bpl @copy_src_ip
ldy #NB65_REMOTE_PORT
lda udp_inp+1 ;src port (lo byte)
sta (nb65_params),y
iny
lda udp_inp+0 ;src port (high byte)
sta (nb65_params),y
iny
lda udp_inp+3 ;dest port (lo byte)
sta (nb65_params),y
iny
lda udp_inp+2 ;dest port (high byte)
sta (nb65_params),y
iny
sec
lda udp_inp+5 ;payload length (lo byte)
sbc #8 ;to remove length of header
sta (nb65_params),y
iny
lda udp_inp+4 ;payload length (hi byte)
sbc #0 ;in case there was a carry from the lo byte
sta (nb65_params),y
iny
lda #<(udp_inp+8) ;payload ptr (lo byte)
sta (nb65_params),y
iny
lda #>(udp_inp+8) ;payload ptr (hi byte)
sta (nb65_params),y
clc
rts
:
cpy #NB65_SEND_UDP_PACKET
bne :+
ldy #3
@copy_dest_ip:
lda (nb65_params),y
sta udp_send_dest,y
dey
bpl @copy_dest_ip
ldy #NB65_REMOTE_PORT
lda (nb65_params),y
sta udp_send_dest_port
iny
lda (nb65_params),y
sta udp_send_dest_port+1
iny
lda (nb65_params),y
sta udp_send_src_port
iny
lda (nb65_params),y
sta udp_send_src_port+1
iny
lda (nb65_params),y
sta udp_send_len
iny
lda (nb65_params),y
sta udp_send_len+1
iny
;AX should point at data to send
lda (nb65_params),y
pha
iny
lda (nb65_params),y
tax
pla
jmp udp_send
:
cpy #NB65_DEACTIVATE
bne :+
ldax jmp_old_irq+1
sei ;don't want any interrupts while we fiddle with the vector
stax $314 ;previous IRQ handler
cli
clc
rts
:
cpy #NB65_TFTP_CALLBACK_DOWNLOAD
bne :+
jsr set_tftp_params
ldy #NB65_TFTP_POINTER+1
lda (nb65_params),y
tax
dey
lda (nb65_params),y
jsr tftp_set_callback_vector
jmp tftp_download
:
cpy #NB65_PRINT_ASCIIZ
bne :+
jsr print
clc
rts
:
cpy #NB65_PRINT_HEX
bne :+
jsr print_hex
clc
rts
:
cpy #NB65_PRINT_DOTTED_QUAD
bne :+
jsr print_dotted_quad
clc
rts
:
cpy #NB65_PRINT_IP_CONFIG
bne :+
jsr print_ip_config
clc
rts
:
cpy #NB65_GET_LAST_ERROR
bne :+
lda ip65_error
clc
rts
:
;default function handler
lda #NB65_ERROR_FUNCTION_NOT_SUPPORTED
sta ip65_error
sec ;carry flag set = error
rts