70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <magenta/vmo.h>
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#include <magenta/limits.h>
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#include <magenta/misc.h>
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#include <magenta/vmar.h>
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#define ROUND_UP(x, b) x += (b) - ((x) % (b))
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static uintptr_t heap_start = 0;
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static uintptr_t heap_end = 0;
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static uintptr_t heap_alloc_point = 0;
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static size_t heap_sz = 0;
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static mx_handle_t heap_vmo = MX_NULL_HANDLE;
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void __crt_heap_init(size_t heap_sz)
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{
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mx_status_t status = mx_vmo_create(
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heap_sz,
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MX_VM_CAN_MAP_READ | MX_VM_CAN_MAP_WRITE | MX_VM_CAN_MAP_SPECIFIC,
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&heap_vmo);
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mx_vaddr_t heap = 0;
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mx_vmar_map(mx_get_startup_handle(MX_B_VMAR_ROOT),
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MX_VM_PERM_READ | MX_VM_PERM_WRITE,
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0, heap_vmo, 0, heap_sz,
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&heap);
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heap_start = heap;
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heap_end = heap + heap_sz;
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heap_alloc_point = heap_start;
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memset((void *)heap, 0x0, heap_sz);
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}
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void *__crt_heap_extend(size_t sz)
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{
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if (sz % MX_PAGE_SIZE) {
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sz &= (MX_PAGE_SIZE - 1);
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sz += MX_PAGE_SIZE;
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}
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if (!heap_start) {
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__crt_heap_init(sz);
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return (void *)heap_start;
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}
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if (!sz) {
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return (void *)heap_end;
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}
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mx_vmo_set_size(heap_vmo, heap_sz + sz);
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mx_vaddr_t vmar_base, alloc_base;
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mx_vmar_bounds(mx_get_startup_handle(MX_B_VMAR_ROOT), &vmar_base, NULL);
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mx_vaddr_t offset = heap_end - vmar_base;
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mx_vmar_map(mx_get_startup_handle(MX_B_VMAR_ROOT),
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MX_VM_PERM_READ | MX_VM_PERM_WRITE | MX_VM_SPECIFIC,
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offset, heap_vmo, heap_sz, sz, &alloc_base);
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heap_sz += sz;
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void *out = (void *)heap_end;
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memset(out, 0x0, sz);
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heap_end += sz;
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return out;
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}
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