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| Author | SHA1 | Date | |
|---|---|---|---|
| 70da0534c0 | |||
| e441663586 |
1
sw/trashernet-as/.gitignore
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1
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491
sw/trashernet-as/Cargo.lock
generated
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491
sw/trashernet-as/Cargo.lock
generated
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|
||||
version = "3.0.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c058f4c41e71a043c67744cb76dcc1ae63ece328c1732a72489ccccc2dec23e6"
|
||||
dependencies = [
|
||||
"num-traits",
|
||||
"rustc_version",
|
||||
"serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.48.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.48.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
|
||||
16
sw/trashernet-as/Cargo.toml
Normal file
16
sw/trashernet-as/Cargo.toml
Normal file
@ -0,0 +1,16 @@
|
||||
[package]
|
||||
name = "trashernet-as"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[build-dependencies]
|
||||
cfgrammar = "0.13"
|
||||
lrlex = "0.13"
|
||||
lrpar = "0.13"
|
||||
|
||||
[dependencies]
|
||||
cfgrammar = "0.13"
|
||||
lrlex = "0.13"
|
||||
lrpar = "0.13"
|
||||
15
sw/trashernet-as/build.rs
Normal file
15
sw/trashernet-as/build.rs
Normal file
@ -0,0 +1,15 @@
|
||||
use cfgrammar::yacc::YaccKind;
|
||||
use lrlex::CTLexerBuilder;
|
||||
|
||||
fn main() {
|
||||
CTLexerBuilder::new()
|
||||
.lrpar_config(|ctp| {
|
||||
ctp.yacckind(YaccKind::Grmtools)
|
||||
.grammar_in_src_dir("calc.y")
|
||||
.unwrap()
|
||||
})
|
||||
.lexer_in_src_dir("calc.l")
|
||||
.unwrap()
|
||||
.build()
|
||||
.unwrap();
|
||||
}
|
||||
186
sw/trashernet-as/notes.md
Normal file
186
sw/trashernet-as/notes.md
Normal file
@ -0,0 +1,186 @@
|
||||
# Trashernet Command Processor
|
||||
|
||||
Commands:
|
||||
|
||||
* MATCH (length, matches, jump), followed by match-jump-addresses if <jump>, followed by match bytes interleaved: Match incoming data against. Set <length> to zero for unconditional jump. If no match, abort reception.
|
||||
* FORWARD (length): Output <length> bytes of data on the output port
|
||||
* IGNORE (length): Ignore <length> bytes
|
||||
* OUTPUT: Output following byte on the special port
|
||||
|
||||
|
||||
Command format:
|
||||
|
||||
2b 4b 3b 1b
|
||||
[Opcode] [length] [matches] [jump]
|
||||
|
||||
|
||||
|
||||
Example program:
|
||||
|
||||
# MAC frame
|
||||
MATCH (6, 2, false) AA.BB.CC.DD.EE.FF FF.FF.FF.FF.FF.FF
|
||||
IGNORE (6)
|
||||
|
||||
# Protocol MUX
|
||||
MATCH (
|
||||
|
||||
# IPv4
|
||||
MATCH (4, 1, false) 192.168.178.1
|
||||
|
||||
|
||||
|
||||
# IDEA 2
|
||||
Okay, I need a new idea. The problem with the first is that I almost always need access to parameters from the past. E.g. ARP requires the sender MAC address for the response. In the current design, I would've already discarded that because what do I care about it for a data packet.
|
||||
|
||||
So, new approach: A packet is received into a RAM ring buffer, and then the script is started with the CRC OK.
|
||||
|
||||
New scripting language:
|
||||
|
||||
* SET_CURSOR (position): Set cursor to position in received telegram
|
||||
* MATCH[!] <address> <pattern>: Jump to address if pattern matches; else continue after pattern and reset cursor to before match (without !), or stop receiving (with !)
|
||||
* FORWARD <length>
|
||||
* OUTPUT <byte>
|
||||
* DIE
|
||||
|
||||
COMMAND formatting:
|
||||
|
||||
general : [3 bit opcode]
|
||||
MATCH : [1b deathflag] [4 bit length]
|
||||
|
||||
Example program:
|
||||
|
||||
MAC_DST: MATCH AA.BB.CC.DD.EE.FF -> ETHERTYPE
|
||||
MAC_BCAST: MATCH! FF.FF.FF.FF.FF.FF -> ETHERTYPE
|
||||
ETHERTYPE_ARP: MATCH 08.06 -> ARP
|
||||
ETHERTYPE_IP: MATCH! 08.00 -> IP
|
||||
ARP: MATCH! 00.01.08.00.06.04 -> ARP_HDR_OK
|
||||
ARP_HDR_OK: MATCH 01 -> ARP_REQUEST
|
||||
MATCH! 02 -> ARP_REPLY
|
||||
ARP_REQUEST: SET_CURSOR +10
|
||||
MATCH! AA.BB.CC.DD.EE.FF -> ARP_REQUEST_OK
|
||||
ARP_REQUEST_OK: OUTPUT 01
|
||||
SET_CURSOR -16
|
||||
FORWARD 10
|
||||
DONE
|
||||
|
||||
|
||||
This program generates an interrupt for
|
||||
* ARP (01) with 10 user bytes SHA+SPA
|
||||
|
||||
|
||||
## Now, on the sender side.
|
||||
|
||||
* TX processor runs on shared memory with receiver, possibly even shared with the receive buffer
|
||||
So that receiver can write "program memory" of transmitter, this is relevant for example for IP TX, which checks that some memory address is the target TX address.
|
||||
|
||||
|
||||
Idea for an IP TX with ARP.
|
||||
|
||||
* Destination IP is written to address in memory
|
||||
* Start IP TX program
|
||||
* ARP_CHECK: SET_CURSOR(ARP RX address buffer)
|
||||
* MATCH <destination address) -> FOUND_IP
|
||||
* WRITE_MEM <ARP TX address buffer> <destination IP>
|
||||
* SET_CURSOR(ARP TX address buffer)
|
||||
* MATCH <destination address> -> ARP_CHECK
|
||||
* !!! TBD: Assemble and send out ARP request
|
||||
* JUMP ARP_CHECK
|
||||
|
||||
* !!! TBD: Loop until MATCH
|
||||
* FOUND_IP: Assemble and send out IP frame
|
||||
|
||||
ideas for improvement:
|
||||
* have two cursors for the TX engine
|
||||
-> basically to select between static data and dynamic
|
||||
|
||||
|
||||
|
||||
|
||||
# Final (TM) Idea
|
||||
|
||||
* We build one processor. It handles both TX and RX
|
||||
* It runs code from a shared memory space with the RX buffer
|
||||
* It has multiple pointer registers (at least two)
|
||||
|
||||
Commands:
|
||||
|
||||
* Match <len, abort_flag,poll_flag> -> <dest>: Compare len characters from ptr1 and ptr2, jump to dest if all match, go to next instruction if not; if len=zero, it's an unconditional jump. `poll_flag` keeps looping here until the condition is met. `abort_flag` will abort command execution on mismatch.
|
||||
* SetPtr <ptr>, <relative/absolute>
|
||||
* Write <len>: Write <len> data from ptr2 to ptr1
|
||||
* Output <ptr, len>: Push <len> data from <ptr> to output FIFO
|
||||
* Input <ptr, len>: Read <len> bytes from input FIFO into <ptr>
|
||||
* Return: TBD: Single-level return to caller (last match?)
|
||||
* Jump <ptr1> <ptr2>: Pseudo-command, will translate to other instructions. Set location of ptr1 and ptr2 (opt.), then jump (empty match) to that address.
|
||||
|
||||
## Example to send an IP frame
|
||||
|
||||
* Write destination IP to <dest-ip>
|
||||
* Start TX IP program
|
||||
|
||||
SendUDP:
|
||||
|
||||
CheckARP:
|
||||
SetPtr ptr1, <arp-rx-ip-buffer>
|
||||
SetPtr ptr2, <dest-ip>
|
||||
Match 4 -> FOUND_ARP
|
||||
NeedARPRequest:
|
||||
Jump SendMAC, ptr1="FF:FF:FF:FF:FF:FF", ptr2="08:06"
|
||||
Jump SendARP, ptr1=<dest-ip>
|
||||
Match 4, poll -> FOUND_ARP
|
||||
FOUND_ARP:
|
||||
|
||||
|
||||
// ## SendMAC: Send MAC frame. ptr1: Destination MAC, ptr2: Ethertype
|
||||
SendMAC:
|
||||
Output ptr1, 6
|
||||
SetPtr ptr1, <my-mac>
|
||||
Output ptr1, 6
|
||||
Output ptr2, 2
|
||||
Return
|
||||
|
||||
SendARPRequest:
|
||||
Output <ARP-header> // TODO
|
||||
Output <my-mac> // SHA
|
||||
Output <my-ip> // SPA
|
||||
Output FF:FF:FF:FF:FF:FF // THA
|
||||
Output <dest-ip> // TPA
|
||||
Return
|
||||
|
||||
|
||||
|
||||
## Maybe change concept
|
||||
|
||||
Idea is: We pretty much have a template for each frame in memory. The program will assemble the data in place, and then TX the entire block
|
||||
|
||||
// Variables will be defined in order!
|
||||
|
||||
// Ethernet frame
|
||||
Def ETH-DEST-MAC:6
|
||||
Def ETH-SOURCE-MAC:6=00:DE:AD:BE:EF:00
|
||||
Def ETH-ETHERTYPE:2
|
||||
|
||||
// ARP frame
|
||||
Def ARP-HEADER:?=0001:0800:0604:0001
|
||||
Def ARP-SHA:0=Ð-SOURCE-MAC
|
||||
Def ARP-SPA:4
|
||||
Def ARP-THA:6
|
||||
Def ARP-TPA:4
|
||||
|
||||
CheckARP:
|
||||
SetPtr ptr1, <arp-rx-ip-buffer>
|
||||
SetPtr ptr2, <dest-ip>
|
||||
Match 4 -> FOUND_ARP
|
||||
NeedARPRequest:
|
||||
// Build Ethernet header
|
||||
Write Ð-DEST-MAC, "FF:FF:FF:FF:FF:FF"
|
||||
Write Ð-ETHERTYPE, "0806"
|
||||
Output Ð-DEST-MAC, 18
|
||||
// Build ARP header
|
||||
Write &ARP_TPA, <dest-ip>, 4
|
||||
Output &ARP-HEADER, 8
|
||||
Output &ARP_SHA, 6
|
||||
Output &ARP_SPA, 4
|
||||
Output &ARP-THA, 10 // +ARP-TPA
|
||||
// todo: set up match
|
||||
Match 4, poll -> FOUND_ARP
|
||||
FOUND_ARP:
|
||||
9
sw/trashernet-as/src/calc.l
Normal file
9
sw/trashernet-as/src/calc.l
Normal file
@ -0,0 +1,9 @@
|
||||
%%
|
||||
SetPtr "SetPtr"
|
||||
[0-9]+ "NUM-DEC"
|
||||
0x[0-9a-fA-F]+ "NUM-HEX"
|
||||
0b[0-1]+ "NUM-BIN"
|
||||
[\n] "NEWLINE"
|
||||
[\t ]+ ;
|
||||
&[0-9a-zA-Z_]+ "Reference"
|
||||
[0-9a-zA-Z ] "text"
|
||||
95
sw/trashernet-as/src/calc.y
Normal file
95
sw/trashernet-as/src/calc.y
Normal file
@ -0,0 +1,95 @@
|
||||
%start CommandSequence
|
||||
%%
|
||||
|
||||
CommandSequence -> Result <LinkedList<Result<LineOfCode, CompilerError>>, CompilerError>:
|
||||
CommandLine CommandSequence
|
||||
{
|
||||
let mut list = $2?;
|
||||
list.push_front($1);
|
||||
Ok(list)
|
||||
}
|
||||
| CommandLine
|
||||
{
|
||||
let mut list : LinkedList<Result<LineOfCode, CompilerError>> = LinkedList::new();
|
||||
list.push_front($1);
|
||||
Ok(list)
|
||||
}
|
||||
;
|
||||
|
||||
CommandLine -> Result<LineOfCode, CompilerError>:
|
||||
Command 'NEWLINE'
|
||||
{
|
||||
Ok(LineOfCode{line : 42, code: $1})
|
||||
}
|
||||
| 'NEWLINE'
|
||||
{
|
||||
Err(CompilerError {pos: $1.unwrap().span(), description: CompilerErrorType::MiscError})
|
||||
}
|
||||
;
|
||||
|
||||
/*Comment -> Result<(), ()>:
|
||||
';' 'text':
|
||||
{
|
||||
Ok(())
|
||||
}
|
||||
;*/
|
||||
|
||||
Command -> Result <Code, CompilerError>:
|
||||
'SetPtr' PointerId Symbol
|
||||
{
|
||||
Ok(Code::Instruction(InstructionType::SetPtr{which: $2?, address: $3?}))
|
||||
}
|
||||
;
|
||||
|
||||
PointerId -> Result<u16, CompilerError>:
|
||||
Literal
|
||||
{
|
||||
let num = $1?;
|
||||
if num > 0 && num <= 1 {
|
||||
Ok(num)
|
||||
} else {
|
||||
//Err(CompilerError {pos: $lexer.line_col($1.unwrap().span()), description: CompilerErrorType::MiscError})
|
||||
Ok(42) // TODO: This should raise an error, but I don't know the span anymore -.-
|
||||
}
|
||||
}
|
||||
;
|
||||
|
||||
Symbol -> Result<Symbol, CompilerError>:
|
||||
Literal
|
||||
{
|
||||
Ok(Symbol::ResolvedSymbol{address: $1?})
|
||||
}
|
||||
| Reference
|
||||
{
|
||||
Ok(Symbol::UnresolvedSymbol{symbol: $1?})
|
||||
}
|
||||
;
|
||||
|
||||
Reference -> Result<String, CompilerError>:
|
||||
'Reference'
|
||||
{
|
||||
Ok($lexer.span_str($1.unwrap().span())[1..].to_string())
|
||||
}
|
||||
;
|
||||
|
||||
Literal -> Result<u16, CompilerError>:
|
||||
'NUM-HEX'
|
||||
{
|
||||
parse_number(16, $1.unwrap().span(), &$lexer.span_str($1.unwrap().span())[2..]) // TODO: Change error to include line/col etc.
|
||||
}
|
||||
| 'NUM-DEC'
|
||||
{
|
||||
parse_number(10, $1.unwrap().span(), &$lexer.span_str($1.unwrap().span()))
|
||||
}
|
||||
;
|
||||
|
||||
%%
|
||||
|
||||
use crate::compiler_types::*;
|
||||
use std::collections::LinkedList;
|
||||
|
||||
fn parse_number(radix: u32, span: lrpar::Span, s: &str) -> Result<u16, CompilerError> {
|
||||
//Ok(u16::from_str_radix(s, radix)?)
|
||||
//u16::from_str_radix(s, radix).map_err(CompilerError{description: CompilerErrorType::MiscError})
|
||||
u16::from_str_radix(s, radix).map_err(|e| CompilerError{pos: span, description: e.into()})
|
||||
}
|
||||
73
sw/trashernet-as/src/compiler_types.rs
Normal file
73
sw/trashernet-as/src/compiler_types.rs
Normal file
@ -0,0 +1,73 @@
|
||||
use std::num;
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum Symbol {
|
||||
UnresolvedSymbol{symbol: String},
|
||||
ResolvedSymbol{address: u16}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum JumpCondition {
|
||||
Always,
|
||||
OnMatch,
|
||||
OnTimer
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum InstructionType {
|
||||
SetPtr{which: u16, address: Symbol},
|
||||
Output{length: Symbol},
|
||||
Match{length: Symbol},
|
||||
Write{length: Symbol},
|
||||
Timer{time: Symbol},
|
||||
Page{page: Symbol},
|
||||
Return,
|
||||
Input{length: Symbol},
|
||||
Jump{address: Symbol, condition: JumpCondition}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum Code {
|
||||
Instruction(InstructionType),
|
||||
Comment(String)
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct LineOfCode {
|
||||
pub line: usize,
|
||||
pub code: Result<Code, CompilerError>
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct CompilerError {
|
||||
pub pos: lrpar::Span,
|
||||
pub description: CompilerErrorType
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum CompilerErrorType {
|
||||
LiteralError(num::ParseIntError),
|
||||
LexerError(lrlex::DefaultLexeme),
|
||||
MiscError
|
||||
}
|
||||
|
||||
|
||||
impl From<num::ParseIntError> for CompilerErrorType {
|
||||
fn from(e: num::ParseIntError) -> Self {
|
||||
CompilerErrorType::LiteralError(e)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<lrlex::DefaultLexeme> for CompilerErrorType {
|
||||
fn from(e: lrlex::DefaultLexeme) -> Self {
|
||||
CompilerErrorType::LexerError(e)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
impl fmt::Debug for LineOfCode {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
write!(f, "Line = {}", self.line)
|
||||
}
|
||||
}
|
||||
*/
|
||||
25
sw/trashernet-as/src/main.rs
Normal file
25
sw/trashernet-as/src/main.rs
Normal file
@ -0,0 +1,25 @@
|
||||
mod compiler_types;
|
||||
|
||||
use std::env;
|
||||
use std::fs;
|
||||
|
||||
use lrlex::lrlex_mod;
|
||||
use lrpar::lrpar_mod;
|
||||
|
||||
lrlex_mod!("calc.l");
|
||||
lrpar_mod!("calc.y");
|
||||
|
||||
fn main() {
|
||||
let lexerdef = calc_l::lexerdef();
|
||||
let args: Vec<String> = env::args().collect();
|
||||
let code = fs::read_to_string(&args[1]).unwrap();
|
||||
let lexer = lexerdef.lexer(&code);
|
||||
let (res, errs) = calc_y::parse(&lexer);
|
||||
for e in errs {
|
||||
println!("{}", e.pp(&lexer, &calc_y::token_epp));
|
||||
}
|
||||
match res {
|
||||
Some(r) => println!("Result: {:#?}", r),
|
||||
_ => eprintln!("Unable to evaluate expression.")
|
||||
}
|
||||
}
|
||||
4
sw/trashernet-as/test.tas
Normal file
4
sw/trashernet-as/test.tas
Normal file
@ -0,0 +1,4 @@
|
||||
SetPtr 1 22
|
||||
SetPtr 2 0x42
|
||||
SetPtr 3 &Ref
|
||||
SetPtr 4 99999
|
||||
@ -55,13 +55,12 @@ architecture rtl of trashernet_arp is
|
||||
signal arp_tx_reply_ack : std_logic; -- ARP reply has been latched and is being sent
|
||||
|
||||
signal arp_tx_request_rq : std_logic; -- Request to transmit an ARP request
|
||||
signal arp_tx_request_tpa : ip_addr_t; -- IP address that we want to know the MAC address of
|
||||
signal arp_tx_request_tpa : ip_addr_t; -- IP address that we want to know the MAC address of, either real target or gateway
|
||||
signal arp_tx_request_ack : std_logic; -- ARP request has been latched and is being sent
|
||||
|
||||
signal arp_rx_reply_stb : std_logic; -- An ARP reply was received (strobe)
|
||||
signal arp_rx_sha : mac_addr_t; -- The MAC address of the reply sender, valid with arp_rx_reply
|
||||
signal arp_rx_spa : ip_addr_t; -- The IP address of the reply sender, valid with arp_rx_reply
|
||||
|
||||
begin
|
||||
resolver : block
|
||||
type resolver_state_t is (IDLE, QUERY_MAC);
|
||||
@ -72,8 +71,10 @@ begin
|
||||
|
||||
signal replied_ip : ip_addr_t;
|
||||
signal replied_mac : mac_addr_t;
|
||||
begin
|
||||
|
||||
signal arp_query_stb : std_logic; -- Pipelined version of arp_in.arp_query_stb
|
||||
signal target_is_in_subnet : std_logic; -- Indicates whether the target IP is the subnet or whether to send this to the gateway
|
||||
begin
|
||||
arp_resolver_main : process(rst, clk) is
|
||||
begin
|
||||
if rst then
|
||||
@ -96,7 +97,7 @@ begin
|
||||
|
||||
case state is
|
||||
when IDLE =>
|
||||
if arp_in.arp_query_stb then
|
||||
if arp_query_stb then
|
||||
if query_mac_found then
|
||||
arp_out.arp_ok_stb <= '1';
|
||||
else
|
||||
@ -118,9 +119,21 @@ begin
|
||||
end if;
|
||||
end process arp_resolver_main;
|
||||
query_mac_found <= '1' when (arp_tx_request_tpa = replied_ip) else '0';
|
||||
target_is_in_subnet <= or((arp_in.arp_ip xor ip_config.gateway) and ip_config.subnet_mask);
|
||||
|
||||
arp_out.arp_mac <= replied_mac;
|
||||
arp_tx_request_tpa <= arp_in.arp_ip;
|
||||
|
||||
-- Pipelines the start of query so that we get some additional time to evaluate the target+netmask.
|
||||
pipeline : process (clk, rst) is
|
||||
begin
|
||||
if rst then
|
||||
arp_tx_request_tpa <= (others => x"00");
|
||||
arp_query_stb <= '0';
|
||||
elsif rising_edge(clk) then
|
||||
arp_tx_request_tpa <= arp_in.arp_ip when target_is_in_subnet else ip_config.gateway;
|
||||
arp_query_stb <= arp_in.arp_query_stb;
|
||||
end if;
|
||||
end process pipeline;
|
||||
|
||||
timeout_timer_inst : entity work.timer
|
||||
generic map(
|
||||
|
||||
Loading…
Reference in New Issue
Block a user