77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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#include "mem.h"
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void memory_copy(u8 *source, u8 *dest, int nbytes) {
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int i;
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for (i = 0; i < nbytes; i++) {
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*(dest + i) = *(source + i);
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}
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}
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void memory_set(u8 *dest, u8 val, u32 len) {
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u8 *temp = (u8 *)dest;
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for ( ; len != 0; len--) *temp++ = val;
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}
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// See globals.h for kmem_addr global declaration
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// kmem_addr is reserved block of memory for kernel to store linked list nodes
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/* Implementation is just a pointer to some free memory which
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* keeps growing */
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u32 kmalloc(u32 size, int align, u32 *phys_addr) {
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/* Pages are aligned to 4K, or 0x1000 */
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if (align == 1 && (kmem_addr & 0xFFFFF000)) {
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kmem_addr &= 0xFFFFF000;
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kmem_addr += 0x1000;
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}
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char c[16];
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hex_to_ascii( *phys_addr, c, 16);
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kprint("Inside kmalloc phys_addr (before) = ");
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kprint(c);
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kprint(" --- ");
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/* Save the physical address */
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*phys_addr = kmem_addr;
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hex_to_ascii( *phys_addr, c, 16);
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kprint("(after) phys_addr = ");
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kprint(c);
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kprint("\n");
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u32 ret = kmem_addr;
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kmem_addr += size; /* Remember to increment the pointer */
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return ret;
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}
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// See globals.h for user_start global declaration
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// umem_addr is reserved block of memory for kernel to store linked list nodes
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/* Implementation is just a pointer to some free memory which
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* keeps growing */
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u32 umalloc(u32 size, int align, u32 *phys_addr) {
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/* Pages are aligned to 4K, or 0x1000 */
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if (align == 1 && (umem_addr & 0xFFFFF000)) {
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umem_addr &= 0xFFFFF000;
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umem_addr += 0x1000;
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}
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char c[16];
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hex_to_ascii( *phys_addr, c, 16);
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kprint("Inside umalloc phys_addr (before) = ");
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kprint(c);
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kprint(" --- ");
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/* Save the physical address */
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*phys_addr = umem_addr;
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hex_to_ascii( *phys_addr, c, 16);
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kprint("(after) phys_addr = ");
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kprint(c);
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kprint("\n");
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u32 ret = umem_addr;
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umem_addr += size; /* Remember to increment the pointer */
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return ret;
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}
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