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2008-01-08 Joel Sherrill <joel.sherrill@oarcorp.com>

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* libcsupport/Makefile.am: Add malloc_sbrk_helpers.c.
	* libcsupport/include/rtems/malloc.h,
	libcsupport/src/malloc.c, libcsupport/src/malloc_initialize.c,
	libcsupport/src/malloc_p.h,
	libcsupport/src/malloc_statistics_helpers.c: Make sbrk()
	support pluggable and optional.  This eliminates the need for
	heap extend and sbrk in the minimum footprint which is ~2.5K on
	the SPARC.
	* sapi/include/confdefs.h: Add the following configuration points:
	  + CONFIGURE_MALLOC_STATISTICS
	  + CONFIGURE_MALLOC_BSP_SUPPORTS_SBRK
	* libcsupport/src/malloc_sbrk_helpers.c: New file.
This commit is contained in:
Joel Sherrill
2008-01-08 22:59:14 +00:00
parent c8f8ffdd08
commit cfcc4e202d
9 changed files with 177 additions and 71 deletions
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cpukit/libcsupport/src/malloc_initialize.c
+9 -30
View File
@@ -22,7 +22,6 @@
Heap_Control RTEMS_Malloc_Heap;
Chain_Control RTEMS_Malloc_GC_list;
size_t RTEMS_Malloc_Sbrk_amount;
rtems_malloc_statistics_t rtems_malloc_statistics;
void RTEMS_Malloc_Initialize(
@@ -33,8 +32,6 @@ void RTEMS_Malloc_Initialize(
{
uint32_t status;
void *starting_address;
uintptr_t old_address;
uintptr_t uaddress;
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
/*
@@ -55,36 +52,18 @@ void RTEMS_Malloc_Initialize(
*/
Chain_Initialize_empty(&RTEMS_Malloc_GC_list);
/*
* If the starting address is 0 then we are to attempt to
* get length worth of memory using sbrk. Make sure we
* align the address that we get back.
*/
starting_address = start;
RTEMS_Malloc_Sbrk_amount = sbrk_amount;
if (!starting_address) {
uaddress = (uintptr_t)sbrk(length);
if (uaddress == (uintptr_t) -1) {
rtems_fatal_error_occurred( RTEMS_NO_MEMORY );
/* DOES NOT RETURN!!! */
}
if (uaddress & (CPU_HEAP_ALIGNMENT-1)) {
old_address = uaddress;
uaddress = (uaddress + CPU_HEAP_ALIGNMENT) & ~(CPU_HEAP_ALIGNMENT-1);
/*
* adjust the length by whatever we aligned by
*/
length -= uaddress - old_address;
}
starting_address = (void *)uaddress;
/*
* Initialize the optional sbrk support for extending the heap
*/
if (rtems_malloc_sbrk_helpers) {
starting_address = (*rtems_malloc_sbrk_helpers->initialize)(
start,
sbrk_amount
);
}
/*
* If the BSP is not clearing out the workspace, then it is most likely
* not clearing out the initial memory for the heap. There is no