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create VMA region by increasing the heap

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This commit is contained in:
Stefan Lankes 2016-05-23 23:50:43 +02:00
parent 966a40e6d0
commit 6a2d7e4727
2 changed files with 7 additions and 2 deletions
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3
hermit/kernel/main.c
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@ -328,6 +328,9 @@ static int initd(void* arg)
curr_task->heap->start = PAGE_FLOOR(heap);
curr_task->heap->end = PAGE_FLOOR(heap);
// reserve VMA region
vma_add(curr_task->heap->start, curr_task->heap->start+PAGE_SIZE, VMA_HEAP|VMA_USER);
//create_kernel_task(NULL, foo, "foo1", NORMAL_PRIO);
//create_kernel_task(NULL, foo, "foo2", NORMAL_PRIO);

6
hermit/kernel/syscall.c
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@ -243,8 +243,10 @@ ssize_t sys_sbrk(ssize_t incr)
ret = heap->end;
heap->end += incr;
if (heap->end < heap->start)
heap->end = heap->start;
// reserve VMA regions
if (PAGE_CEIL(heap->end) > PAGE_CEIL(ret))
vma_add(PAGE_CEIL(ret+PAGE_SIZE), PAGE_FLOOR(heap->end), VMA_HEAP|VMA_USER);
// allocation and mapping of new pages for the heap
// is catched by the pagefault handler