UbixOS V2 2.0

dma.c
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1 /*-
2 * Copyright (c) 2002-2018 The UbixOS Project.
3 * All rights reserved.
4 *
5 * This was developed by Christopher W. Olsen for the UbixOS Project.
6 *
7 * Redistribution and use in source and binary forms, with or without modification, are permitted
8 * provided that the following conditions are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright notice, this list of
11 * conditions, the following disclaimer and the list of authors.
12 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13 * conditions, the following disclaimer and the list of authors in the documentation and/or
14 * other materials provided with the distribution.
15 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16 * endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/dma.h>
30 #include <sys/io.h>
31
32 #define lowByte(x) (x & 0x00FF)
33 #define highByte(x) ((x & 0xFF00) >> 8)
34
35 static uInt8 maskReg[8] = { 0x0A, 0x0A, 0x0A, 0x0A, 0xD4, 0xD4, 0xD4, 0xD4 };
36 static uInt8 clearReg[8] = { 0x0C, 0x0C, 0x0C, 0x0C, 0xD8, 0xD8, 0xD8, 0xD8 };
37 static uInt8 modeReg[8] = { 0x0B, 0x0B, 0x0B, 0x0B, 0xD6, 0xD6, 0xD6, 0xD6 };
38 static uInt8 addrPort[8] = { 0x00, 0x02, 0x04, 0x06, 0xC0, 0xC4, 0xC8, 0xCC };
39 static uInt8 pagePort[8] = { 0x87, 0x83, 0x81, 0x82, 0x8F, 0x8B, 0x89, 0x8A };
40 static uInt8 countPort[8] = { 0x01, 0x03, 0x05, 0x07, 0xC2, 0xC6, 0xCA, 0xCE };
41
42 void dmaXfer(uint8_t channel, uint32_t address, uInt length, uint8_t read) {
43 unsigned char page = 0, mode = 0;
44 unsigned int offset = 0;
45 if (read) {
46 mode = 0x48 + channel;
47 }
48 else {
49 mode = 0x44 + channel;
50 }
51 page = address >> 16;
52 offset = address & 0xFFFF;
53 length--;
54 _dmaXfer(channel, page, offset, length, mode);
55 }
56
57 void _dmaXfer(uInt8 dmaChannel, uInt8 page, uInt offset, uInt length, uInt8 mode) {
58 //asm("cli");
59 outportByte(maskReg[dmaChannel], 0x04 | dmaChannel);
60 outportByte(clearReg[dmaChannel], 0x00);
61 outportByte(modeReg[dmaChannel], mode);
62 outportByte(addrPort[dmaChannel], lowByte(offset));
63 outportByte(addrPort[dmaChannel], highByte(offset));
64 outportByte(pagePort[dmaChannel], page);
65 outportByte(countPort[dmaChannel], lowByte(length));
66 outportByte(countPort[dmaChannel], highByte(length));
67 outportByte(maskReg[dmaChannel], dmaChannel);
68 //asm("sti");
69 }
highByte
#define highByte(x)
Definition: dma.c:33
lowByte
#define lowByte(x)
Definition: dma.c:32
uInt
unsigned int uInt
Definition: types.h:65
outportByte
void outportByte(unsigned int, unsigned char)
outputut one byte to specified port
Definition: io.c:72
uInt8
unsigned char uInt8
Definition: objgfx30.h:47
uint32_t
__uint32_t uint32_t
Definition: types.h:46
dmaXfer
void dmaXfer(uint8_t channel, uint32_t address, uInt length, uint8_t read)
Definition: dma.c:42
read
int read(struct thread *td, struct read_args *uap)
Definition: gen_calls.c:100
io.h
_dmaXfer
void _dmaXfer(uInt8 dmaChannel, uInt8 page, uInt offset, uInt length, uInt8 mode)
Definition: dma.c:57
uint8_t
__uint8_t uint8_t
Definition: types.h:44
dma.h