--- nono/vm/dmac.cpp	2026/04/29 17:04:28	1.1.1.1
+++ nono/vm/dmac.cpp	2026/04/29 17:04:32	1.1.1.2
@@ -4,6 +4,9 @@
 //
 
 #include "dmac.h"
+#include "mystring.h"
+
+std::unique_ptr<DMACDevice> gDMAC;
 
 DMACDevice::DMACDevice()
 {
@@ -11,6 +14,24 @@ DMACDevice::DMACDevice()
 	devname = "DMAC";
 	devaddr = baseaddr;
 	devlen  = 0x2000;
+
+	monitor.Init(80, 30);
+
+	for (int i = 0; i < countof(dmac.chan); i++) {
+		dmac.chan[i].ch = i;
+		dmac.chan[i].parent = this;
+	}
+	dmac.chan[0].desc = "FD";
+	dmac.chan[1].desc = "HD";
+	dmac.chan[2].desc = "User";
+	dmac.chan[3].desc = "ADPCM";
+
+	for (int i = 0; i < countof(event); i++) {
+		event[i].dev = this;
+		event[i].func = (DeviceCallback_t)&DMACDevice::Transfer;
+		event[i].SetName(string_format("DMAC #%d", i));
+		event[i].code = i;
+	}
 }
 
 DMACDevice::~DMACDevice()
@@ -24,113 +45,142 @@ DMACDevice::Read8(uint32 addr)
 	int ch;
 
 	ch = (addr - baseaddr) / 0x40;
-	struct DMAC::channel *chan = &dmac.chan[ch];
+	DMAC::Channel *chan = &dmac.chan[ch];
 	int n = (addr - baseaddr) % 0x40; 
 	switch (n) {
 	 case DMAC::CSR:
-		data = chan->csr;
+		data = chan->PeekCSR();
+		putlog(4, "#%d CSR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::CER:
 		data = chan->cer;
+		putlog(4, "#%d CER -> $%02x", ch, data);
 		break;
 
 	 case DMAC::DCR:
 		data = chan->dcr;
+		putlog(4, "#%d DCR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::OCR:
 		data = chan->ocr;
+		putlog(4, "#%d OCR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::SCR:
 		data = chan->scr;
+		putlog(4, "#%d SCR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::CCR:
-		data = chan->ccr;
+		data = chan->PeekCCR();
+		putlog(4, "#%d CCR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::MTC:
 		data = chan->mtc >> 8;
+		putlog(4, "#%d MTC:H -> $%02x", ch, data);
 		break;
 	 case DMAC::MTC + 1:
 		data = chan->mtc & 0xff;
+		putlog(4, "#%d MTC:L -> $%02x", ch, data);
 		break;
 
 	 case DMAC::MAR:
 		data = chan->mar >> 24;
+		putlog(4, "#%d MAR:0 -> $%02x", ch, data);
 		break;
 	 case DMAC::MAR + 1:
 		data = (chan->mar >> 16) & 0xff;
+		putlog(4, "#%d MAR:1 -> $%02x", ch, data);
 		break;
 	 case DMAC::MAR + 2:
 		data = (chan->mar >> 8) & 0xff;
+		putlog(4, "#%d MAR:2 -> $%02x", ch, data);
 		break;
 	 case DMAC::MAR + 3:
 		data = chan->mar & 0xff;
+		putlog(4, "#%d MAR:3 -> $%02x", ch, data);
 		break;
 
 	 case DMAC::DAR:
 		data = chan->dar >> 24;
+		putlog(4, "#%d DAR:0 -> $%02x", ch, data);
 		break;
 	 case DMAC::DAR + 1:
 		data = (chan->dar >> 16) & 0xff;
+		putlog(4, "#%d DAR:1 -> $%02x", ch, data);
 		break;
 	 case DMAC::DAR + 2:
 		data = (chan->dar >> 8) & 0xff;
+		putlog(4, "#%d DAR:2 -> $%02x", ch, data);
 		break;
 	 case DMAC::DAR + 3:
 		data = chan->dar & 0xff;
+		putlog(4, "#%d DAR:3 -> $%02x", ch, data);
 		break;
 
 	 case DMAC::BTC:
 		data = chan->btc >> 8;
+		putlog(4, "#%d BTC:H -> $%02x", ch, data);
 		break;
 	 case DMAC::BTC + 1:
 		data = chan->btc & 0xff;
+		putlog(4, "#%d BTC:L -> $%02x", ch, data);
 		break;
 
 	 case DMAC::BAR:
 		data = chan->bar >> 24;
+		putlog(4, "#%d BAR:0 -> $%02x", ch, data);
 		break;
 	 case DMAC::BAR + 1:
 		data = (chan->bar >> 16) & 0xff;
+		putlog(4, "#%d BAR:1 -> $%02x", ch, data);
 		break;
 	 case DMAC::BAR + 2:
 		data = (chan->bar >> 8) & 0xff;
+		putlog(4, "#%d BAR:2 -> $%02x", ch, data);
 		break;
 	 case DMAC::BAR + 3:
 		data = chan->bar & 0xff;
+		putlog(4, "#%d BAR:3 -> $%02x", ch, data);
 		break;
 
 	 case DMAC::NIV:
 		data = chan->niv;
+		putlog(4, "#%d NIV -> $%02x", ch, data);
 		break;
 
 	 case DMAC::EIV:
 		data = chan->eiv;
+		putlog(4, "#%d EIV -> $%02x", ch, data);
 		break;
 
 	 case DMAC::MFC:
 		data = chan->mfc;
+		putlog(4, "#%d MFC -> $%02x", ch, data);
 		break;
 
 	 case DMAC::CPR:
 		data = chan->cpr;
+		putlog(4, "#%d CPR -> $%02x", ch, data);
 		break;
 
 	 case DMAC::DFC:
 		data = chan->dfc;
+		putlog(4, "#%d DFC -> $%02x", ch, data);
 		break;
 
 	 case DMAC::BFC:
 		data = chan->bfc;
+		putlog(4, "#%d BFC -> $%02x", ch, data);
 		break;
 
 	 case DMAC::GCR:
 		if (ch == 3) {
 			data = dmac.gcr;
+			putlog(4, "GCR -> $%02x", data);
 			break;
 		} else {
 			data = 0xff;
@@ -151,11 +201,11 @@ DMACDevice::Write8(uint32 addr, uint32 d
 	int ch;
 
 	ch = (addr - baseaddr) / 0x40;
-	struct DMAC::channel *chan = &dmac.chan[ch];
+	DMAC::Channel *chan = &dmac.chan[ch];
 	int n = (addr - baseaddr) % 0x40; 
 	switch (n) {
 	 case DMAC::CSR:
-		write_csr(ch, data);
+		chan->WriteCSR(data);
 		break;
 
 	 case DMAC::CER:
@@ -163,100 +213,127 @@ DMACDevice::Write8(uint32 addr, uint32 d
 		break;
 
 	 case DMAC::DCR:
+		putlog(4, "#%d DCR <- $%02x", ch, data);
 		chan->dcr = data & 0xfb;
 		break;
 
 	 case DMAC::OCR:
+		putlog(4, "#%d OCR <- $%02x", ch, data);
 		chan->ocr = data;
 		break;
 
 	 case DMAC::SCR:
+		putlog(4, "#%d SCR <- $%02x", ch, data);
 		chan->scr = data & 0x0f;
 		break;
 
 	 case DMAC::CCR:
-		write_ccr(ch, data);
+		putlog(4, "#%d CCR <- $%02x", ch, data);
+		chan->WriteCCR(data);
 		break;
 
 	 case DMAC::MTC:
 		chan->mtc = (chan->mtc & 0x00ff) | (data << 8);
+		putlog(4, "#%d MTC:H <- $%02x (MTC=$%04x)", ch, data, chan->mtc);
 		break;
 	 case DMAC::MTC + 1:
 		chan->mtc = (chan->mtc & 0xff00) | data;
+		putlog(4, "#%d MTC:L <- $%02x (MTC=$%04x)", ch, data, chan->mtc);
 		break;
 
 	 case DMAC::MAR:
 		chan->mar = (chan->mar & 0x00ffffff) | (data << 24);
+		putlog(4, "#%d MAR:0 <- $%02x (MAR=$%08x)", ch, data, chan->mar);
 		break;
 	 case DMAC::MAR + 1:
 		chan->mar = (chan->mar & 0xff00ffff) | (data << 16);
+		putlog(4, "#%d MAR:1 <- $%02x (MAR=$%08x)", ch, data, chan->mar);
 		break;
 	 case DMAC::MAR + 2:
 		chan->mar = (chan->mar & 0xffff00ff) | (data << 8);
+		putlog(4, "#%d MAR:2 <- $%02x (MAR=$%08x)", ch, data, chan->mar);
 		break;
 	 case DMAC::MAR + 3:
 		chan->mar = (chan->mar & 0xffffff00) | data;
+		putlog(4, "#%d MAR:3 <- $%02x (MAR=$%08x)", ch, data, chan->mar);
 		break;
 
 	 case DMAC::DAR:
 		chan->dar = (chan->dar & 0x00ffffff) | (data << 24);
+		putlog(4, "#%d DAR:0 <- $%02x (DAR=$%08x)", ch, data, chan->dar);
 		break;
 	 case DMAC::DAR + 1:
 		chan->dar = (chan->dar & 0xff00ffff) | (data << 16);
+		putlog(4, "#%d DAR:1 <- $%02x (DAR=$%08x)", ch, data, chan->dar);
 		break;
 	 case DMAC::DAR + 2:
 		chan->dar = (chan->dar & 0xffff00ff) | (data << 8);
+		putlog(4, "#%d DAR:2 <- $%02x (DAR=$%08x)", ch, data, chan->dar);
 		break;
 	 case DMAC::DAR + 3:
 		chan->dar = (chan->dar & 0xffffff00) | data;
+		putlog(4, "#%d DAR:3 <- $%02x (DAR=$%08x)", ch, data, chan->dar);
 		break;
 
 	 case DMAC::BTC:
 		chan->btc = (chan->btc & 0x00ff) | (data << 8);
+		putlog(4, "#%d BTC:H <- $%02x (BTC=$%04x)", ch, data, chan->btc);
 		break;
 	 case DMAC::BTC + 1:
 		chan->btc = (chan->btc & 0xff00) | data;
+		putlog(4, "#%d BTC:L <- $%02x (BTC=$%04x)", ch, data, chan->btc);
 		break;
 
 	 case DMAC::BAR:
 		chan->bar = (chan->bar & 0x00ffffff) | (data << 24);
+		putlog(4, "#%d BAR:0 <- $%02x (BAR=$%08x)", ch, data, chan->bar);
 		break;
 	 case DMAC::BAR + 1:
 		chan->bar = (chan->bar & 0xff00ffff) | (data << 16);
+		putlog(4, "#%d BAR:1 <- $%02x (BAR=$%08x)", ch, data, chan->bar);
 		break;
 	 case DMAC::BAR + 2:
 		chan->bar = (chan->bar & 0xffff00ff) | (data << 8);
+		putlog(4, "#%d BAR:2 <- $%02x (BAR=$%08x)", ch, data, chan->bar);
 		break;
 	 case DMAC::BAR + 3:
 		chan->bar = (chan->bar & 0xffffff00) | data;
+		putlog(4, "#%d BAR:3 <- $%02x (BAR=$%08x)", ch, data, chan->bar);
 		break;
 
 	 case DMAC::NIV:
+		putlog(4, "#%d NIV <- $%02x", ch, data);
 		chan->niv = data;
 		break;
 
 	 case DMAC::EIV:
+		putlog(4, "#%d EIV <- $%02x", ch, data);
 		chan->eiv = data;
 		break;
 
 	 case DMAC::MFC:
+		putlog(4, "#%d MFC <- $%02x", ch, data);
 		chan->mfc = data & 7;
 		break;
 
 	 case DMAC::CPR:
+		putlog(4, "#%d CPR <- $%02x", ch, data);
 		chan->cpr = data & 3;
 		break;
 
 	 case DMAC::DFC:
+		putlog(4, "#%d DFC <- $%02x", ch, data);
 		chan->dfc = data & 7;
 		break;
 
 	 case DMAC::BFC:
+		putlog(4, "#%d BFC <- $%02x", ch, data);
 		chan->bfc = data & 7;
 		break;
 
 	 case DMAC::GCR:
 		if (ch == 3) {
+			putlog(4, "GCR <- $%02x", data);
 			dmac.gcr = data;
 		}
 		break;
@@ -274,11 +351,11 @@ DMACDevice::Peek8(uint32 addr)
 	int ch;
 
 	ch = (addr - baseaddr) / 0x40;
-	struct DMAC::channel *chan = &dmac.chan[ch];
+	const DMAC::Channel *chan = &dmac.chan[ch];
 	int n = (addr - baseaddr) % 0x40; 
 	switch (n) {
 	 case DMAC::CSR:
-		data = chan->csr;
+		data = chan->PeekCSR();
 		break;
 
 	 case DMAC::CER:
@@ -298,7 +375,7 @@ DMACDevice::Peek8(uint32 addr)
 		break;
 
 	 case DMAC::CCR:
-		data = chan->ccr;
+		data = chan->PeekCCR();
 		break;
 
 	 case DMAC::MTC:
@@ -395,15 +472,525 @@ DMACDevice::Peek8(uint32 addr)
 	return data;
 }
 
+bool
+DMACDevice::MonitorUpdate()
+{
+	int x;
+	int y;
+
+	monitor.Clear();
+
+	y = 1;
+	monitor.Print(0, y++, "CSR");
+	y += 2;
+	monitor.Print(0, y++, "CER");
+	monitor.Print(0, y++, "DCR:XRM");
+	monitor.Print(0, y++, "DCR:DTYP");
+	monitor.Print(0, y++, "DCR:DPS");
+	monitor.Print(0, y++, "DCR:PCL");
+	monitor.Print(0, y++, "OCR:DIR");
+	monitor.Print(0, y++, "OCR:SIZE");
+	monitor.Print(0, y++, "OCR:CHAIN");
+	monitor.Print(0, y++, "OCR:REQG");
+	monitor.Print(0, y++, "SCR:MAC");
+	monitor.Print(0, y++, "SCR:DAC");
+	monitor.Print(0, y++, "CCR");
+	y += 2;
+	monitor.Print(0, y++, "MTC");
+	monitor.Print(0, y++, "MAR");
+	monitor.Print(0, y++, "DAR");
+	monitor.Print(0, y++, "BTC");
+	monitor.Print(0, y++, "BAR");
+	monitor.Print(0, y++, "NIV");
+	monitor.Print(0, y++, "EIV");
+	monitor.Print(0, y++, "MFC");
+	monitor.Print(0, y++, "CPR");
+	monitor.Print(0, y++, "DFC");
+	monitor.Print(0, y++, "BFC");
+
+	for (int ch = 0; ch < 4; ch++) {
+		DMAC::Channel *chan = &dmac.chan[ch];
+		int val;
+		x = 12 + ch * 17;
+		y = 0;
+
+		// 地味だけど有効なチャンネルをハイライトしてみる
+		monitor.Print(x, y++, (chan->active ? TA::Em : TA::Off),
+			"#%d (%s)", chan->ch, chan->desc);
+
+		// CSR
+		val = chan->PeekCSR();
+		monitor.Print(x, y++, "$%02x", val);
+		static const char * const csrname[] = {
+			"COC", "BTC", "NDT", "ERR", "ACT", "---", "PCT", "PCS",
+		};
+		MonitorReg4(x, y++, val >> 4,   &csrname[0]);
+		MonitorReg4(x, y++, val & 0xff, &csrname[4]);
+
+		// CER
+		val = chan->cer & 0x1f;
+		const char *e;
+		if (val <= 0x11 && errnames[val]) {
+			e = errnames[val];
+		} else {
+			e = "?";
+		}
+		monitor.Print(x, y, "$%02x", chan->cer);
+		if (val > 0) {
+			monitor.Print(x + 3, y, ":%s", e);
+		}
+		y++;
+
+		// DCR:XRM
+		static const char * const dcr_xrm[] = {
+			//1234567890123
+			"Burst",
+			"undefined",
+			"CycleW/O Hold",
+			"CycleWithHold",
+		};
+		val = chan->dcr >> 6;
+		monitor.Print(x, y++, "%d:%s", val, dcr_xrm[val]);
+
+		// DCR:DTYP
+		static const char * const dcr_dtyp[] = {
+			//1234567890123
+			"68000",
+			"6800",
+			"ACK",
+			"ACK+READY",
+		};
+		val = (chan->dcr >> 4) & 3;
+		monitor.Print(x, y++, "%d:%s", val, dcr_dtyp[val]);
+
+		// DCR:DPS
+		static const char * const dcr_dps[] = {
+			//1234567890123
+			"8bit",
+			"16bit",
+		};
+		val = (chan->dcr >> 3) & 1;
+		monitor.Print(x, y++, "%d:%s", val, dcr_dps[val]);
+
+		// DCR:PCL
+		monitor.Print(x, y++, "XXX PCL");
+
+		// OCR:DIR
+		static const char * const ocr_dir[] = {
+			//1234567890123
+			"MemoryToDevice",
+			"DeviceToMemory",
+		};
+		val = (chan->ocr >> 7);
+		monitor.Print(x, y++, "%d:%s", val, ocr_dir[val]);
+
+		// OCR:SIZE
+		static const char * const ocr_size[] = {
+			//1234567890123
+			"8bit",
+			"16bit",
+			"32bit",
+			"8bit Unpacked",
+		};
+		val = (chan->ocr >> 4) & 3;
+		monitor.Print(x, y++, "%d:%s", val, ocr_size[val]);
+
+		// OCR:CHAIN
+		static const char * const ocr_chain[] = {
+			//1234567890123
+			"NoChain",
+			"undefined",
+			"ArrayChain",
+			"LinkArrayChain",
+		};
+		val = (chan->ocr >> 2) & 3;
+		monitor.Print(x, y++, "%d:%s", val, ocr_chain[val]);
+
+		// OCR:REQG
+		static const char * const ocr_reqg[] = {
+			//1234567890123
+			"AutoReq(Limit)",
+			"AutoReq(Max)",
+			"ExternalReq",
+			"AutoThenExt",
+		};
+		val = (chan->ocr & 3);
+		monitor.Print(x, y++, "%d:%s", val, ocr_reqg[val]);
+
+		// SCR:MAC
+		static const char * const scr_xac[] = {
+			//1234567890123
+			"NoCount",
+			"CountUp",
+			"CountDown",
+			"undefined",
+		};
+		val = (chan->scr >> 2) & 3;
+		monitor.Print(x, y++, "%d:%s", val, scr_xac[val]);
+		val = chan->scr & 3;
+		monitor.Print(x, y++, "%d:%s", val, scr_xac[val]);
+
+		// CCR
+		val = chan->PeekCCR();
+		monitor.Print(x, y++, "$%02x", val);
+		static const char * const ccrnames[] = {
+			"STR", "CNT", "HLT", "SAB", "INT", "---", "---", "---",
+		};
+		MonitorReg4(x, y++, (val >> 4),   &ccrnames[0]);
+		MonitorReg4(x, y++, (val & 0xff), &ccrnames[4]);
+
+		// MTC
+		monitor.Print(x, y++, "$%04x", chan->mtc);
+		// MAR
+		// X680x0 がターゲットなので24bit超える設定は目立たせる
+		if (chan->mar > 0xffffff) {
+			monitor.Print(x, y++, TA::On, "$%08x", chan->mar);
+		} else {
+			monitor.Print(x, y++, "$%06x", chan->mar);
+		}
+		// DAR
+		if (chan->dar > 0xffffff) {
+			monitor.Print(x, y++, TA::On, "$%08x", chan->dar);
+		} else {
+			monitor.Print(x, y++, "$%06x", chan->dar);
+		}
+		// BTC
+		monitor.Print(x, y++, "$%04x", chan->btc);
+		// BAR
+		if (chan->bar > 0xffffff) {
+			monitor.Print(x, y++, TA::On, "$%08x", chan->bar);
+		} else {
+			monitor.Print(x, y++, "$%06x", chan->bar);
+		}
+
+		// NIV
+		monitor.Print(x, y++, "$%02x", chan->niv);
+		// EIV
+		monitor.Print(x, y++, "$%02x", chan->eiv);
+
+		// MFC
+		monitor.Print(x, y++, "$%02x", chan->mfc);
+		// CPR
+		monitor.Print(x, y++, "$%02x", chan->cpr);
+		// DFC
+		monitor.Print(x, y++, "$%02x", chan->dfc);
+		// BFC
+		monitor.Print(x, y++, "$%02x", chan->bfc);
+
+		if (ch == 3) {
+			monitor.Print(x - 5, y++, "GCR: $%02x", dmac.gcr);
+		}
+	}
+
+	return true;
+}
+
+// 4ビット分を表示する。MonitorUpdate の下請け
+void
+DMACDevice::MonitorReg4(int x, int y, uint32 reg, const char * const *names)
+{
+	for (int i = 0; i < 4; i++) {
+		bool b = reg & (1 << (3 - i));
+		uint attr = b ? TA::On : TA::Off;
+		monitor.Print(x + i * 4, y, attr, "%s", names[i]);
+	}
+}
+
+/*static*/ const char * const
+DMACDevice::errnames[] = {
+	//12345678901
+	"",				// $00 No Error
+	"ConfigErr",	// $01
+	"OperTiming",	// $02
+	NULL,			// $03
+	NULL,			// $04
+	"AddrErrInMAR",	// $05
+	"AddrErrInDAR",	// $06
+	"AddrErrInBAR",	// $07
+	NULL,			// $08
+	"BusErrInMAR",	// $09
+	"BusErrInDAR",	// $0a
+	"BusErrInBAR",	// $0b
+	NULL,			// $0c
+	"CntErrInMTC",	// $0d
+	NULL,			// $0e
+	"CntErrInBTC",	// $0f
+	"ExternAbort",	// $10
+	"SoftAbort",	// $11
+};
+
+// Read と Peek とそれ以外からも呼ばれるので副作用を持たせてはいけない。
+uint8
+DMAC::Channel::PeekCSR() const
+{
+	uint32 val;
+
+	val = csr & 0xf0;
+	if (active) {
+		val |= CSR_ACT;
+	}
+	// PCT は PCL が High から Low に変わるとセット
+	if (prev_pcl == true && pcl == false) {
+		val |= CSR_PCT;
+	}
+	if (pcl) {
+		val |= CSR_PCS;
+	}
+	return val;
+}
+
 void
-DMACDevice::write_csr(int ch, uint32 data)
+DMAC::Channel::WriteCSR(uint32 data)
 {
-	putlog(1, "write_csr[%d] <- $%02x 未実装書き込み", ch, data);
+	// 上位4ビットは %1 の書き込みでクリア
+	csr &= ~(data & 0xf0);
+
+	// PCT も %1 の書き込みでクリア
+	// PCT は PCL が High → Low の時セットなので prev_pcl を下げればよい
+	if ((data & DMAC::CSR_PCT)) {
+		prev_pcl = false;
+	}
+
+	parent->putlog(4, "#%d CSR <- $%02x (CSR = $%02x)", ch, data, PeekCSR());
+}
+
+// Read と Peek から呼ばれるので副作用を持たせてはいけない。
+uint8
+DMAC::Channel::PeekCCR() const
+{
+	uint32 val;
+
+	val = ccr & 0xf0;
+	if (int_enable) {
+		val |= DMAC::CCR_INT;
+	}
+	return val;
 }
 
 void
-DMACDevice::write_ccr(int ch, uint32 data)
+DMAC::Channel::WriteCCR(uint32 data)
 {
-	putlog(1, "write_ccr[%d] <- $%02x 未実装書き込み", ch, data);
+	// 割り込み許可ビットは常に反映
+	int_enable = (data & DMAC::CCR_INT);
+
+	// SAB (Software Abort)
+	if ((data & DMAC::CCR_SAB)) {
+		// イベントを触るため親デバイスで処理する
+		parent->AbortTransfer(this);
+	}
+
+	// HLT (Halt Operation)
+	if ((data & DMAC::CCR_HLT)) {
+		parent->putlog(0, "CCR HLT 未実装");
+	}
+
+	// CNT (Continue Operation)
+	if ((data & DMAC::CCR_CNT)) {
+		parent->putlog(0, "CCR CNT 未実装");
+	}
+
+	// STR (Start Operation)
+	if ((data & DMAC::CCR_STR)) {
+		StartTransfer();
+	}
 }
 
+// 割り込み要因ビットをセットし、必要なら割り込みを上げる。
+// PCL は割り込み条件を満たしている時だけ呼ぶこと。
+// ここはレジスタに対する書き込みではない。
+void
+DMAC::Channel::SetINT(uint32 val)
+{
+	int vector;
+
+	csr |= val;
+
+	// ERR ビットが立つと SAB をクリアする
+	if ((csr & CSR_ERR)) {
+		ccr &= ~CCR_SAB;
+	}
+
+	if (int_enable) {
+		if ((csr & CSR_ERR)) {
+			vector = eiv;
+		} else {
+			vector = niv;
+		}
+		gMPU680x0->Interrupt(3, vector);
+	}
+}
+
+// 転送開始
+void
+DMAC::Channel::StartTransfer()
+{
+	// CSR の COC,BTC,NDT,ERR が立ってたら開始しない
+	if ((csr & 0xf0) != 0) {
+		cer = CER_CONFIG;	// ?
+		csr |= CSR_ERR;
+		return;
+	}
+
+	active = true;
+
+	// XXX CER をどこかでクリアしないといけないようだがどこだ?
+	cer = 0;
+
+	// 転送方法は DPS(1bit) と SIZE(2bit) で合計 8通り。
+	// (その中にさらに転送方向が2通りずつあるけど)
+	//
+	// xfertype DPS   SIZE
+	//     0    8bit  8bit packed
+	//     1    8bit  16bit
+	//     2    8bit  32bit
+	//     3    8bit  8bit
+	//     4    16bit 8bit packed
+	//     5    16bit 16bit
+	//     6    16bit 32bit
+	//     7    16bit 8bit
+	xfertype = (GetDPS() << 2) | GetSIZE();
+
+	// 転送モード
+	switch (GetREQG()) {
+	 case DMAC::OCR_REQG_AUTO_LIM:
+		PANIC("REQG_AUTO_LIM 未実装");
+		break;
+
+	 case DMAC::OCR_REQG_AUTO_MAX:
+		// 自発的に転送を開始する
+		parent->Transfer(ch);
+		break;
+
+	 case DMAC::OCR_REQG_EXTERNAL:
+	 case DMAC::OCR_REQG_AUTOFIRST:
+		PANIC("未実装 REQG");
+		break;
+
+	 default:
+		__unreachable();
+	}
+}
+
+// 転送
+// (イベントを持つのでこれはデバイスクラスのメソッド)
+void
+DMACDevice::Transfer(int ch)
+{
+	DMAC::Channel *chan = &dmac.chan[ch];
+	int64 rv;
+
+	putlog(4, "#%d Transfer (MTC=$%04x)", ch, chan->mtc);
+
+	rv = 0;
+	switch (chan->xfertype) {
+	 case 0:	// 8ビットポート、8ビットサイズ、パック動作
+
+	 case 1:	// 8ビットポート、16ビットサイズ
+
+	 case 2:	// 8ビットポート、32ビットサイズ
+		PANIC("未実装 xfer type");
+
+	 case 3:	// 8ビットポート、8ビットサイズ、パックなし動作
+		if (chan->GetDIR() == DMAC::OCR_DIR_MtoD) {
+			rv = TransferM8toD8(chan);
+		} else {
+			rv = TransferD8toM8(chan);
+		}
+		break;
+
+	 case 4:	// 16ビットポート、8ビットサイズ、パック動作
+	 case 5:	// 16ビットポート、16ビットサイズ
+	 case 6:	// 16ビットポート、32ビットサイズ
+	 case 7:	// 16ビットポート、8ビットサイズ、パックなし動作
+		PANIC("未実装 xfer type");
+	}
+
+	// XXX バスエラーは?
+	if (rv < 0) {
+		return;
+	}
+
+	// バスエラーでなければカウンタを更新
+	// XXX とりあえず。後で書く
+	switch (chan->GetMAC()) {
+	 case DMAC::SCR_COUNT_UP:
+		chan->mar += 1;
+		break;
+	 case DMAC::SCR_COUNT_DOWN:
+		chan->mar -= 1;
+		break;
+	}
+	switch (chan->GetDAC()) {
+	 case DMAC::SCR_COUNT_UP:
+		chan->dar += 1;
+		break;
+	 case DMAC::SCR_COUNT_DOWN:
+		chan->dar -= 1;
+		break;
+	}
+
+	chan->mtc--;
+	if (chan->mtc == 0) {
+		// 転送完了
+		chan->active = false;
+		chan->SetINT(DMAC::CSR_COC);
+	} else {
+		// 次回の転送
+		// XXX とりあえず 1us で1回の転送にする
+		event[ch].time = 1_usec;
+		event[ch].Start();
+	}
+}
+
+// メモリから 8ビットデバイスへ (パックなし動作)
+int64
+DMACDevice::TransferM8toD8(DMAC::Channel *chan)
+{
+	uint64 data;
+	int64 rv;
+
+	data = vm_phys_read_8(chan->mar);
+	if ((int64)data < 0)
+		return data;
+	rv = vm_phys_write_8(chan->dar, data);
+	if (rv < 0)
+		return rv;
+
+	return 0;
+}
+
+// 8ビットデバイスからメモリへ (パックなし動作)
+int64
+DMACDevice::TransferD8toM8(DMAC::Channel *chan)
+{
+	uint64 data;
+	int64 rv;
+
+	data = vm_phys_read_8(chan->dar);
+	if ((int64)data < 0)
+		return data;
+	rv = vm_phys_write_8(chan->mar, data);
+	if (rv < 0)
+		return rv;
+
+	return 0;
+}
+
+// ソフトウェアアボート
+// (イベントを持つのでこれはデバイスクラスのメソッド)
+void
+DMACDevice::AbortTransfer(DMAC::Channel *chan)
+{
+	int ch = chan->ch;
+
+	putlog(2, "CCR SAB ソフトウェアアボート");
+
+	// %1 を書き込むことで実際には SAB はセットされるが、ERR が立つと
+	// SAB をクリアする動作のため、書き込んだ %1 が読めることはない。
+	// ここでは SAB ビットのセットを省略。
+
+	event[ch].Stop();
+	chan->active = false;
+	chan->cer = DMAC::CER_SOFT_ABORT;
+	chan->SetINT(DMAC::CSR_ERR);
+}