forked from M-Labs/zynq-rs
88 lines
2.7 KiB
Rust
88 lines
2.7 KiB
Rust
use core::mem::uninitialized;
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use crate::{register, register_bit, register_bits, register_bits_typed, regs::*};
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/// Descriptor entry
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#[repr(C)]
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pub struct DescEntry {
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word0: DescWord0,
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word1: DescWord1,
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}
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register!(desc_word0, DescWord0, RW, u32);
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/// true if owned by software, false if owned by hardware
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register_bit!(desc_word0, used, 0);
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/// mark last desc in list
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register_bit!(desc_word0, wrap, 1);
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register_bits!(desc_word0, address, u32, 2, 31);
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register!(desc_word1, DescWord1, RW, u32);
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register_bits!(desc_word1, frame_length_lsbs, u16, 0, 12);
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register_bit!(desc_word1, bad_fcs, 13);
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register_bit!(desc_word1, start_of_frame, 14);
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register_bit!(desc_word1, end_of_frame, 15);
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register_bit!(desc_word1, cfi, 16);
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register_bits!(desc_word1, vlan_priority, u8, 17, 19);
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register_bit!(desc_word1, priority_tag, 20);
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register_bit!(desc_word1, vlan_tag, 21);
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register_bits!(desc_word1, bits_22_23, u8, 22, 23);
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register_bit!(desc_word1, bit_24, 24);
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register_bits!(desc_word1, spec_addr_which, u8, 25, 26);
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register_bit!(desc_word1, spec_addr_match, 27);
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register_bit!(desc_word1, uni_hash_match, 29);
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register_bit!(desc_word1, multi_hash_match, 30);
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register_bit!(desc_word1, global_broadcast, 31);
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#[repr(C)]
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pub struct DescList<'a> {
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list: &'a mut [DescEntry],
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buffers: &'a mut [[u8; 1536]],
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next: usize,
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}
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impl<'a> DescList<'a> {
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pub fn new(list: &'a mut [DescEntry], buffers: &'a mut [[u8; 1536]]) -> Self {
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let last = list.len().min(buffers.len()) - 1;
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for (i, (entry, buffer)) in list.iter_mut().zip(buffers.iter_mut()).enumerate() {
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let is_last = i == last;
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assert!(buffer.len() >= 1536);
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let buffer_addr = &mut buffer[0] as *mut _ as u32;
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assert!(buffer_addr & 0b11 == 0);
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entry.word0.write(
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DescWord0::zeroed()
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.used(false)
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.wrap(is_last)
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.address(buffer_addr >> 2)
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);
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entry.word1.write(
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DescWord1::zeroed()
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);
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}
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DescList {
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list,
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buffers,
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next: 0,
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}
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}
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pub fn list_addr(&self) -> u32 {
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&self.list[0] as *const _ as u32
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}
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pub fn recv_next(&mut self) -> Option<&[u8]> {
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if self.list[self.next].word0.read().used() {
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let len = self.list[self.next].word1
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.read().frame_length_lsbs()
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.into();
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let pkt = &self.buffers[self.next][0..len];
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self.next += 1;
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if self.next >= self.list.len() {
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self.next = 0;
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}
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Some(pkt)
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} else {
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None
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}
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}
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}
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