source: rtems/bsps/powerpc/include/mpc8xx/mmu.h @ 2afb22b

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

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

Update #3254.

  • Property mode set to 100644
File size: 1.0 KB
2 * mmu.h
3 *
4 * This include file contains definitions pertaining
5 * to the MMU on the MPC8xx.
6 *
7 * Copyright (c) 1999, National Research Council of Canada
8 *
9 * The license and distribution terms for this file may be
10 * found in the file LICENSE in this distribution or at
11 *
12 */
14#ifndef _MPC8XX_MMU_H
15#define _MPC8XX_MMU_H
17#ifdef __cplusplus
18extern "C" {
22 * The MMU_TLB_table is used to statically initialize the Table Lookaside
23 * Buffers in the MMU of an MPC8xx.
24 */
25typedef struct {
26  uint32_t      mmu_epn;        /* Effective Page Number */
27  uint32_t      mmu_twc;        /* Tablewalk Control Register */
28  uint32_t      mmu_rpn;        /* Real Page Number */
29} MMU_TLB_table_t;
32 * The MMU_TLB_table and its size, MMU_N_TLB_Table_Entries, must be
33 * supplied by the BSP.
34 */
35extern MMU_TLB_table_t MMU_TLB_table[]; /* MMU TLB table supplied by BSP */
36extern int MMU_N_TLB_Table_Entries;     /* Number of entries in MMU TLB table */
38/* Functions */
40void mmu_init( void );
42#ifdef __cplusplus
47/* end of include file */
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