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comparison cos/kernel/malloc.c @ 28:47b7df514243

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Moved Makefiles
author windel
date Wed, 28 Dec 2011 13:38:43 +0100
parents dcce92b1efbc
children 7e3bdcb391dc
comparison
equal deleted inserted replaced
27:7f74363f4c82 28:47b7df514243
1 #include "kernel.h" 1 #include "kernel.h"
2
3 // ================= Placement malloc:
4 extern uint64_t end;
5 uint64_t placement_address = (uint64_t)&end;
6
7 void* kmalloc_int(uint64_t size)
8 {
9 uint64_t tmp = placement_address;
10 placement_address += size;
11 return (void*)tmp;
12 }
13
14 void* kmalloc_aligned_int(uint64_t size)
15 {
16 if ( (placement_address | 0xFFF) != 0 )
17 {
18 placement_address &= ~(0xFFF);
19 placement_address += 0x1000;
20 }
21 uint64_t tmp = placement_address;
22 placement_address += size;
23 return (void*)tmp;
24 }
25
26
27 // ================= Other malloc
28 // TODO: move this to user space?
2 29
3 #define HEAP_MAGIC 0xc0ffee 30 #define HEAP_MAGIC 0xc0ffee
4 #define HEAP_START 0x400000 31 #define HEAP_START 0x400000
5 #define HEAP_SIZE 0x200000 32 #define HEAP_SIZE 0x200000
6 #define HEAP_INUSE 1 33 #define HEAP_INUSE 1
15 /* 42 /*
16 malloc and free divide the chunks of memory present at the heap 43 malloc and free divide the chunks of memory present at the heap
17 of the kernel into smaller parts. 44 of the kernel into smaller parts.
18 The heap is located at: 0x 45 The heap is located at: 0x
19 */ 46 */
47
20 static heap_t* kernel_heap = (heap_t*) 0x400000; // 4 MB - 6 MB is heap 48 static heap_t* kernel_heap = (heap_t*) 0x400000; // 4 MB - 6 MB is heap
21 /* Allocates 'size' bytes and returns the pointer if succesfull. 49 /* Allocates 'size' bytes and returns the pointer if succesfull.
22 Kernelpanic in case of failure.. 50 Kernelpanic in case of failure..
23 */ 51 */
24 52