28 lines
691 B
C
28 lines
691 B
C
#include <zinnia/alloc.h>
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#include <zinnia/utils.h>
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#include <zinnia/virt.h>
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#include <stdatomic.h>
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#include <stddef.h>
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struct page* vm_pfndb = nullptr;
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// TODO: Replace with actual allocator.
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static _Atomic(size_t) mapping_offset = 0;
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uintptr_t vm_alloc(size_t length) {
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uintptr_t base = arch_mem_mapping_addr();
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size_t offset =
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atomic_fetch_add_explicit(&mapping_offset, ALIGN_UP(length, arch_mem_page_size()), memory_order_acquire);
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return base + offset;
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}
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void vm_free(uintptr_t ptr, size_t length) {
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// TODO
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}
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uintptr_t vm_page_addr(struct page* page) {
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return (((uintptr_t)page - (uintptr_t)vm_pfndb) / sizeof(struct page)) * arch_mem_page_size();
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}
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