mpabi
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
#include "heap4_common.h"
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#define HEAP_BYTES 160U
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static uint8_t heap_area[HEAP_BYTES + HEAP4_ALIGNMENT];
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static HeapBlock start;
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static HeapBlock *end_marker;
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volatile size_t g_initial_free_size;
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volatile uintptr_t g_aligned_offset;
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volatile int g_end_is_last;
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static void heap_init(void)
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{
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uintptr_t raw;
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uintptr_t aligned;
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size_t available;
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HeapBlock *first;
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raw = (uintptr_t)&heap_area[0];
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aligned = heap4_align_address(raw);
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available = HEAP_BYTES - (size_t)(aligned - raw);
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available &= ~HEAP4_ALIGNMENT_MASK;
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first = (HeapBlock *)aligned;
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end_marker = (HeapBlock *)(aligned + available - sizeof(HeapBlock));
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end_marker->next = 0;
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end_marker->size = 0U;
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first->next = end_marker;
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first->size = (uint8_t *)end_marker - (uint8_t *)first;
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start.next = first;
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start.size = 0U;
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}
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int main(void)
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{
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heap_init();
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g_aligned_offset = (uintptr_t)start.next - (uintptr_t)&heap_area[0];
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g_initial_free_size = start.next->size;
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g_end_is_last = (start.next->next == end_marker) && (end_marker->next == 0);
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TRACE_PRINTF("offset=%u free=%u end_last=%d\n",
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(unsigned)g_aligned_offset, (unsigned)g_initial_free_size,
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g_end_is_last);
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return 0;
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}
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