source: rtems/bsps/powerpc/include/libcpu/byteorder.h @ a2dad96

5
Last change on this file since a2dad96 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: 1.2 KB
Line 
1/*
2 * byteorder.h
3 *
4 *        This file contains inline implementation of function to
5 *          deal with endian conversion.
6 *
7 * It is a stripped down version of linux ppc file...
8 *
9 * Copyright (C) 1999  Eric Valette (valette@crf.canon.fr)
10 *                     Canon Centre Recherche France.
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#ifndef _LIBCPU_BYTEORDER_H
18#define _LIBCPU_BYTEORDER_H
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24static inline unsigned ld_le16(volatile uint16_t *addr)
25{
26        unsigned val;
27
28        __asm__ volatile ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
29        return val;
30}
31
32static inline void st_le16(volatile uint16_t *addr, unsigned val)
33{
34        __asm__ volatile ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
35}
36
37static inline unsigned ld_le32(volatile uint32_t *addr)
38{
39        unsigned val;
40
41        __asm__ volatile ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
42        return val;
43}
44
45static inline void st_le32(volatile uint32_t *addr, unsigned val)
46{
47        __asm__ volatile ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
48}
49
50#ifdef __cplusplus
51}
52#endif
53
54#endif /* _LIBCPU_BYTEORDER_H */
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