31 lines
991 B
C
31 lines
991 B
C
#pragma once
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#include "src/panic.h"
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#include <stdint.h>
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void memory_init();
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void *memory_allocate(uint64_t size);
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void memory_free(void *pointer);
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static inline void memory_set(uint8_t value, uint64_t bytes, void *to) {
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__asm__ volatile("rep stosb" : "=D"(to), "=c"(bytes) : "D"(to), "a"(value), "c"(bytes) : "memory");
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}
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static inline void memory_move(void *from, uint64_t bytes, void *to) {
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if (to == from) {
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return;
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} else if (to < from) {
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__asm__ volatile("rep movsb" : "=D"(to), "=S"(from), "=c"(bytes) : "D"(to), "S"(from), "c"(bytes) : "memory");
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} else {
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ASSERT(0, "memory_move: forward overlapping move not implemented");
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}
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}
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static inline void memory_copy(const void *from, uint64_t bytes, void *to) {
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ASSERT((uint64_t)to + bytes <= (uint64_t)from || (uint64_t)to >= (uint64_t)from + bytes, "memory_copy: overlapping backward copy");
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__asm__ volatile("rep movsb" : "=D"(to), "=S"(from), "=c"(bytes) : "D"(to), "S"(from), "c"(bytes) : "memory");
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}
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