lxdream 0.9.1| filename | src/sh4/dmac.h |
| changeset | 736:a02d1475ccfd |
| prev | 561:533f6b478071 |
| author | nkeynes |
| date | Sat Dec 27 02:59:35 2008 +0000 (15 years ago) |
| branch | lxdream-mem |
| permissions | -rw-r--r-- |
| last change | Replace fpscr_mask/fpscr flags in xlat_cache_block with a single xlat_sh4_mode, which tracks the field of the same name in sh4r - actually a little faster this way. Now depends on SR.MD, FPSCR.PR and FPSCR.SZ (although it doesn't benefit from the SR flag yet). Also fixed the failure to check the flags in the common case (code address returned by previous block) which took away the performance benefits, but oh well. |
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1 /**
2 * $Id$
3 *
4 * SH4 onboard DMA controller (DMAC) definitions.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
19 #ifndef lxdream_dmac_H
20 #define lxdream_dmac_H 1
22 #include <stdint.h>
24 #ifdef __cplusplus
25 extern "C" {
26 #endif
28 /* External DREQ. Note only used for DMA memory-to-memory - for single
29 * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.
30 */
31 #define DMAC_EXTERNAL 0
32 #define DMAC_SCI_TDE 1 /* SCI Transmit data empty */
33 #define DMAC_SCI_RDF 2 /* SCI Receive data full */
34 #define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */
35 #define DMAC_SCIF_RDF 4 /* SCIF Receive data full */
36 #define DMAC_TMU_ICI 5 /* TMU Input capture interrupt (not used?) */
38 /**
39 * Trigger a DMAC transfer by asserting one of the above DMA request lines
40 * (from the onboard peripherals). Actual transfer is dependent on the
41 * relevant channel configuration.
42 */
43 void DMAC_trigger( int dmac_trigger );
45 /**
46 * Execute a memory-to-external-device transfer. Copies data into the supplied
47 * buffer up to a maximum of bytecount bytes.
48 * @return Actual number of bytes copied.
49 */
50 uint32_t DMAC_get_buffer( int channel, unsigned char *buf, uint32_t bytecount );
52 /**
53 * execute an external-device-to-memory transfer. Copies data from the
54 * supplied buffer into memory up to a maximum of bytecount bytes.
55 * @return Actual number of bytes copied.
56 */
57 uint32_t DMAC_put_buffer( int channel, unsigned char *buf, uint32_t bytecount );
59 #ifdef __cplusplus
60 }
61 #endif
63 #endif /* !lxdream_dmac_H */
.