From 56e182a6a9e58b951712582c4c63cf303847156e Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Sun, 25 Jan 2009 20:35:00 -0800 Subject: X86: Add a dummy minimal DMA controller that doesn't do anything. --- src/dev/x86/i8237.cc | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) create mode 100644 src/dev/x86/i8237.cc (limited to 'src/dev/x86/i8237.cc') diff --git a/src/dev/x86/i8237.cc b/src/dev/x86/i8237.cc new file mode 100644 index 000000000..5afe6b91a --- /dev/null +++ b/src/dev/x86/i8237.cc @@ -0,0 +1,130 @@ +/* + * Copyright (c) 2008 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Gabe Black + */ + +#include "dev/x86/i8237.hh" +#include "mem/packet.hh" +#include "mem/packet_access.hh" + +Tick +X86ISA::I8237::read(PacketPtr pkt) +{ + assert(pkt->getSize() == 1); + Addr offset = pkt->getAddr() - pioAddr; + switch (offset) { + case 0x0: + panic("Read from i8237 channel 0 current address unimplemented.\n"); + case 0x1: + panic("Read from i8237 channel 0 remaining " + "word count unimplemented.\n"); + case 0x2: + panic("Read from i8237 channel 1 current address unimplemented.\n"); + case 0x3: + panic("Read from i8237 channel 1 remaining " + "word count unimplemented.\n"); + case 0x4: + panic("Read from i8237 channel 2 current address unimplemented.\n"); + case 0x5: + panic("Read from i8237 channel 2 remaining " + "word count unimplemented.\n"); + case 0x6: + panic("Read from i8237 channel 3 current address unimplemented.\n"); + case 0x7: + panic("Read from i8237 channel 3 remaining " + "word count unimplemented.\n"); + case 0x8: + panic("Read from i8237 status register unimplemented.\n"); + default: + panic("Read from undefined i8237 register %d.\n", offset); + } + return latency; +} + +Tick +X86ISA::I8237::write(PacketPtr pkt) +{ + assert(pkt->getSize() == 1); + Addr offset = pkt->getAddr() - pioAddr; + switch (offset) { + case 0x0: + panic("Write to i8237 channel 0 starting address unimplemented.\n"); + case 0x1: + panic("Write to i8237 channel 0 starting " + "word count unimplemented.\n"); + case 0x2: + panic("Write to i8237 channel 1 starting address unimplemented.\n"); + case 0x3: + panic("Write to i8237 channel 1 starting " + "word count unimplemented.\n"); + case 0x4: + panic("Write to i8237 channel 2 starting address unimplemented.\n"); + case 0x5: + panic("Write to i8237 channel 2 starting " + "word count unimplemented.\n"); + case 0x6: + panic("Write to i8237 channel 3 starting address unimplemented.\n"); + case 0x7: + panic("Write to i8237 channel 3 starting " + "word count unimplemented.\n"); + case 0x8: + panic("Write to i8237 command register unimplemented.\n"); + case 0x9: + panic("Write to i8237 request register unimplemented.\n"); + case 0xa: + { + uint8_t command = pkt->get(); + uint8_t select = bits(command, 1, 0); + uint8_t bitVal = bits(command, 2); + if (!bitVal) + panic("Turning on i8237 channels unimplemented.\n"); + replaceBits(maskReg, select, bitVal); + } + break; + case 0xb: + panic("Write to i8237 mode register unimplemented.\n"); + case 0xc: + panic("Write to i8237 clear LSB/MSB flip-flop " + "register unimplemented.\n"); + case 0xd: + panic("Write to i8237 master clear/reset register unimplemented.\n"); + case 0xe: + panic("Write to i8237 clear mask register unimplemented.\n"); + case 0xf: + panic("Write to i8237 write all mask register bits unimplemented.\n"); + default: + panic("Write to undefined i8254 register.\n"); + } + return latency; +} + +X86ISA::I8237 * +I8237Params::create() +{ + return new X86ISA::I8237(this); +} -- cgit v1.2.3