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author | Chris Johns <chrisj@rtems.org> | 2017-12-23 18:18:56 +1100 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-01-25 08:45:26 +0100 |
commit | 2afb22b7e1ebcbe40373ff7e0efae7d207c655a9 (patch) | |
tree | 44759efe9374f13200a97e96d91bd9a2b7e5ce2a /bsps/powerpc/haleakala/include/mmu_405.h | |
parent | MAINTAINERS: Add myself to Write After Approval. (diff) | |
download | rtems-2afb22b7e1ebcbe40373ff7e0efae7d207c655a9.tar.bz2 |
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.
Diffstat (limited to 'bsps/powerpc/haleakala/include/mmu_405.h')
-rw-r--r-- | bsps/powerpc/haleakala/include/mmu_405.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/bsps/powerpc/haleakala/include/mmu_405.h b/bsps/powerpc/haleakala/include/mmu_405.h new file mode 100644 index 0000000000..e11cfa7738 --- /dev/null +++ b/bsps/powerpc/haleakala/include/mmu_405.h @@ -0,0 +1,77 @@ +#ifndef _mmu_405_h +#define _mmu_405_h + +/* + Simple interface to the PowerPC 405 MMU + + The intention here is just to allow the MMU to be used to define cacheability and + read/write/execute permissions in a simple enough way to fit entirely into the + 64-entry TLB cache. + + This code does not do address relocation and does not generate any MMU-related interrupts. + + The process ID support is there for a possible future extension where RTEMS supports + setting the process ID on task switches, which allows per-process stack protection + + This code will call fatal_error() if your add_space() calls overrun the 64 entries + + Michael Hamel ADInstruments 2008 + +*/ + + +#ifdef __cplusplus +extern "C" { +#endif + +#include "stdint.h" + +enum { + kAllProcessIDs = 0 +}; + +typedef enum MMUAccessType { + executable, + readOnlyData, + readOnlyNoCache, + readWriteData, + readWriteNoCache, + readWriteExecutable +} MMUAccessType; + +/* Initialise and clear the MMU */ +void mmu_initialise(); + +/* Turn on/off data access translation */ +bool mmu_enable_data(bool enable); + +/* Turn on instruction translation */ +bool mmu_enable_code(bool enable); + +/* Define properties for an area of memory (must be 1K-aligned) */ +void mmu_add_space(uint32_t startAddr, uint32_t endAddr, MMUAccessType permissions, uint8_t processID); + +/* Delete a memory property definition */ +void mmu_remove_space(uint32_t startAddr, uint32_t endAddr); + +/* Return number of TLB entries out of total in use */ +int mmu_get_tlb_count(); + +/* Allocate a new process ID and return it */ +uint8_t mmu_new_processID(); + +/* Free a process ID that has been in use */ +void mmu_free_processID(uint8_t freeThis); + +/* Return the current process ID */ +uint8_t mmu_current_processID(); + +/* Change the process ID to ID and return the old value */ +uint8_t mmu_set_processID(uint8_t toID); + + +#ifdef __cplusplus +} +#endif + +#endif //_mmu_405.h
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