source: rtems/bsps/powerpc/include/bsp/start.h @ 2afb22b

5
Last change on this file since 2afb22b 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: 1.8 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup powerpc_start
5 *
6 * @brief System low level start.
7 */
8
9/*
10 * Copyright (c) 2010 embedded brains GmbH.  All rights reserved.
11 *
12 *  embedded brains GmbH
13 *  Obere Lagerstr. 30
14 *  82178 Puchheim
15 *  Germany
16 *  <rtems@embedded-brains.de>
17 *
18 * The license and distribution terms for this file may be
19 * found in the file LICENSE in this distribution or at
20 * http://www.rtems.org/license/LICENSE.
21 */
22
23#ifndef LIBBSP_POWERPC_SHARED_START_H
24#define LIBBSP_POWERPC_SHARED_START_H
25
26#include <stddef.h>
27
28#ifdef __cplusplus
29extern "C" {
30#endif /* __cplusplus */
31
32/**
33 * @defgroup powerpc_start PowerPC System Start
34 *
35 * @ingroup powerpc_shared
36 *
37 * @brief PowerPC low level start.
38 *
39 * @{
40 */
41
42#define BSP_START_TEXT_SECTION __attribute__((section(".bsp_start_text")))
43
44#define BSP_START_DATA_SECTION __attribute__((section(".bsp_start_data")))
45
46/**
47* @brief System start entry.
48*/
49void _start(void);
50
51/**
52 * Zeros @a byte_count bytes starting at @a begin.
53 *
54 * It wraps around in case of an address overflow.  The stack will not be used.
55 * The code is position independent.  It uses the data cache block zero
56 * instruction in case the data cache is enabled.  There are no alignment
57 * constains for @a begin and @a byte_count.
58 *
59 * @see bsp_start_zero_begin, bsp_start_zero_end, and bsp_start_zero_size.
60 */
61void BSP_START_TEXT_SECTION bsp_start_zero(void *begin, size_t byte_count);
62
63/**
64 * @brief Symbol which equals the bsp_start_zero() code begin.
65 */
66extern char bsp_start_zero_begin [];
67
68/**
69 * @brief Symbol which equals the bsp_start_zero() code end.
70 */
71extern char bsp_start_zero_end [];
72
73/**
74 * @brief Symbol which equals the bsp_start_zero() code size.
75 */
76extern char bsp_start_zero_size [];
77
78/** @} */
79
80#ifdef __cplusplus
81}
82#endif /* __cplusplus */
83
84#endif /* LIBBSP_POWERPC_SHARED_START_H */
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