source: rtems/bsps/arm/lpc176x/include/bsp/dma.h @ c77cd426

5
Last change on this file since c77cd426 was 2afb22b, checked in by Chris Johns <chrisj@…>, on 12/23/17 at 07:18:56

Remove make preinstall

A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.

This has at least seven problems:

  • The make preinstall step itself needs time and disk space.
  • Errors in header files show up in the build tree copy. This makes it hard for editors to open the right file to fix the error.
  • There is no clear relationship between source and build tree header files. This makes an audit of the build process difficult.
  • The visibility of all header files in the build tree makes it difficult to enforce API barriers. For example it is discouraged to use BSP-specifics in the cpukit.
  • An introduction of a new build system is difficult.
  • Include paths specified by the -B option are system headers. This may suppress warnings.
  • The parallel build had sporadic failures on some hosts.

This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.

The new cpukit include directories are:

  • cpukit/include
  • cpukit/score/cpu/@RTEMS_CPU@/include
  • cpukit/libnetworking

The new BSP include directories are:

  • bsps/include
  • bsps/@RTEMS_CPU@/include
  • bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include

There are build tree include directories for generated files.

The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.

The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.

Update #3254.
  • Property mode set to 100644
File size: 2.0 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup lpc176x_dma
5 *
6 * @brief Direct memory access (DMA) support.
7 */
8
9/*
10 * Copyright (c) 2008, 2009
11 * embedded brains GmbH
12 * Obere Lagerstr. 30
13 * D-82178 Puchheim
14 * Germany
15 * <rtems@embedded-brains.de>
16 *
17 * The license and distribution terms for this file may be
18 * found in the file LICENSE in this distribution or at
19 * http://www.rtems.org/license/LICENSE.
20 */
21
22#ifndef LIBBSP_ARM_LPC176X_DMA_H
23#define LIBBSP_ARM_LPC176X_DMA_H
24
25#include <rtems.h>
26
27#ifdef __cplusplus
28extern "C" {
29#endif /* __cplusplus */
30
31/**
32 * @defgroup lpc176x_dma DMA Support
33 *
34 * @ingroup lpc176x
35 *
36 * @brief Direct memory access (DMA) support.
37 *
38 * @{
39 */
40
41/**
42 * @brief Initializes the general purpose DMA.
43 */
44void lpc176x_dma_initialize( void );
45
46/**
47 * @brief Tries to obtain the DMA channel @a channel.
48 *
49 * @retval RTEMS_SUCCESSFUL Successful operation.
50 * @retval RTEMS_INVALID_ID Invalid channel number.
51 * @retval RTEMS_RESOURCE_IN_USE Channel already occupied.
52 */
53rtems_status_code lpc176x_dma_channel_obtain( unsigned channel );
54
55/**
56 * @brief Releases the DMA channel @a channel.
57 *
58 * You must have obtained this channel with lpc176x_dma_channel_obtain()
59 * previously.
60 *
61 * If the channel number @a channel is out of range nothing will happen.
62 */
63void lpc176x_dma_channel_release( unsigned channel );
64
65/**
66 * @brief Disables the DMA channel @a channel.
67 *
68 * If @a force is @c false the channel will be halted and disabled when the
69 * channel is inactive otherwise it will be disabled immediately.
70 *
71 * If the channel number @a channel is out of range nothing will happen.
72 */
73void lpc176x_dma_channel_disable(
74  unsigned channel,
75  bool     force
76);
77
78rtems_status_code lpc176x_dma_copy_initialize( void );
79
80rtems_status_code lpc176x_dma_copy_release( void );
81
82rtems_status_code lpc176x_dma_copy(
83  unsigned    channel,
84  const void *dest,
85  const void *src,
86  size_t      n,
87  size_t      width
88);
89
90rtems_status_code lpc176x_dma_copy_wait( unsigned channel );
91
92/** @} */
93
94#ifdef __cplusplus
95}
96#endif /* __cplusplus */
97
98#endif /* LIBBSP_ARM_LPC176X_DMA_H */
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