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core: dma: Count cycles passed in DMA transfers

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Former-commit-id: 751f2e42f9c5c19f2fcc901754950d1e3797303b
Former-commit-id: 30d31be99daec4324532d4663390945a55f641b1
This commit is contained in:
Michel Heily 2020-10-17 06:28:04 -07:00 committed by MishMish
parent b6e2d55550
commit 44c9e2c875
1 changed files with 12 additions and 8 deletions
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20
core/src/dma.rs
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@ -1,9 +1,9 @@
use super::arm7tdmi::memory::{MemoryAccess, MemoryInterface};
use super::cartridge::BackupMedia;
use super::interrupt::{self, Interrupt, InterruptConnect, SharedInterruptFlags};
use super::iodev::consts::{REG_FIFO_A, REG_FIFO_B};
use super::sched::{EventType, Scheduler, SharedScheduler};
use super::sysbus::SysBus;
use super::Bus;
use num::FromPrimitive;
use serde::{Deserialize, Serialize};
@ -151,22 +151,26 @@ impl DmaChannel {
let fifo_mode = self.fifo_mode;
let mut access = MemoryAccess::NonSeq;
if fifo_mode {
for _ in 0..4 {
let v = sb.read_32(self.internal.src_addr & !3);
sb.write_32(self.internal.dst_addr & !3, v);
let v = sb.load_32(self.internal.src_addr & !3, access);
sb.store_32(self.internal.dst_addr & !3, v, access);
access = MemoryAccess::Seq;
self.internal.src_addr += 4;
}
} else if word_size == 4 {
for _ in 0..count {
let w = sb.read_32(self.internal.src_addr & !3);
sb.write_32(self.internal.dst_addr & !3, w);
let w = sb.load_32(self.internal.src_addr & !3, access);
sb.store_32(self.internal.dst_addr & !3, w, access);
access = MemoryAccess::Seq;
self.xfer_adj_addrs(word_size);
}
} else {
for _ in 0..count {
let hw = sb.read_16(self.internal.src_addr & !1);
sb.write_16(self.internal.dst_addr & !1, hw);
let hw = sb.load_16(self.internal.src_addr & !1, access);
sb.store_16(self.internal.dst_addr & !1, hw, access);
access = MemoryAccess::Seq;
self.xfer_adj_addrs(word_size)
}
}
@ -240,7 +244,7 @@ impl DmaController {
if self.channels[channel_id].write_dma_ctrl(value) {
// DMA actually starts after 3 cycles
self.scheduler
.schedule(EventType::DmaActivateChannel(channel_id), 3);
.push(EventType::DmaActivateChannel(channel_id), 3);
} else {
self.deactivate_channel(channel_id);
}