source: rtems/bsps/i386/include/libcpu/cpuModel.h @ be3d7d75

5
Last change on this file since be3d7d75 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: 1.4 KB
Line 
1/*
2 *  This file contains declaration for variables and code
3 *  that may be used to get the Intel Cpu identification
4 *  that has been performed by checkCPUtypeSetCr0 function.
5 */
6
7/*
8 *  COPYRIGHT (c) 1998 valette@crf.canon.fr
9 *
10 *  The license and distribution terms for this file may be
11 *  found in the file LICENSE in this distribution or at
12 *  http://www.rtems.org/license/LICENSE.
13 */
14
15#ifndef libcpu_cpuModel_h
16#define libcpu_cpuModel_h
17
18/*
19 * Tell us the machine setup..
20 */
21
22extern char hard_math;  /* floating point coprocessor present indicator */
23extern char x86;        /* type of cpu (3 = 386, 4 =486, ...) */
24extern char x86_model;
25extern char x86_mask;
26extern int x86_capability;       /* cpuid:EDX */
27extern int x86_capability_x;     /* cpuid:ECX */
28extern int x86_capability_ebx;   /* cpuid:EBX */
29extern int x86_capability_cores; /* cpuid.(EAX=4, ECX=0) - physical cores */
30extern char x86_vendor_id[13];
31extern int have_cpuid;
32extern unsigned char Cx86_step; /* cyrix processor identification */
33
34/* Display this information on console in ascii form */
35extern void printCpuInfo(void);
36
37/* determine if the CPU has a TSC */
38#define x86_has_tsc() \
39  (x86_capability & (1 << 4))
40
41static inline unsigned long long
42rdtsc(void)
43{
44  /* Return the value of the on-chip cycle counter. */
45  unsigned long long result;
46  __asm__ volatile(".byte 0x0F, 0x31" : "=A" (result));
47  return result;
48} /* rdtsc */
49
50
51#endif
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