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comparison cos/kernel/mm.c @ 37:5c20bd53cccd

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Cleanup
author windel
date Mon, 16 Jan 2012 21:38:55 +0100
parents 8012221dd740
children 24ce177e01e8
comparison
equal deleted inserted replaced
36:91f91ff07ea8 37:5c20bd53cccd
4 * 4 *
5 * */ 5 * */
6 6
7 #include "kernel.h" 7 #include "kernel.h"
8 8
9 // Bitmap that keeps track of all the 4 kB memory pages in the system:
9 static uint64_t *frames = 0; 10 static uint64_t *frames = 0;
10 static uint64_t nframes = 0; 11 static uint64_t nframes = 0;
11 12
12 memmap_t* kernel_map = 0; // kernel memory mapping 13 memmap_t* kernel_map = 0; // kernel memory mapping
13 memmap_t* current_map = 0; // The currently active memory mapping 14 memmap_t* current_map = 0; // The currently active memory mapping
53 54
54 // No frame found: 55 // No frame found:
55 return (uint64_t) -1; 56 return (uint64_t) -1;
56 } 57 }
57 58
58 // Memory manager functions: 59 /*
60 * Initializes the memory manager, allocating a bitmap once.
61 */
59 void init_memory(uint64_t total_mem_size) 62 void init_memory(uint64_t total_mem_size)
60 { 63 {
64 printf("Running with %d MB ram\n", total_mem_size / 1000000);
65
61 // Only here placement malloc is used! 66 // Only here placement malloc is used!
62 // 67 //
63 // Allocate and clear bits to remember which 4kb-frames are in use: 68 // Allocate and clear bits to remember which 4KiB-frames are in use:
64 nframes = (total_mem_size / 0x1000); 69 nframes = (total_mem_size / 0x1000); // Calculate number of frames
65 frames = (uint64_t*)kmalloc_int( (nframes / 64) * sizeof(uint64_t) ); 70 frames = (uint64_t*)kmalloc_int( (nframes / 64) * sizeof(uint64_t) );
66 memset(frames, 0, (nframes / 64) * sizeof(uint64_t)); 71 memset(frames, 0, (nframes / 64) * sizeof(uint64_t));
67 72
68 // Create kernel map: 73 // Create kernel map:
69 kernel_map = (memmap_t*)kmalloc_aligned_int(sizeof(memmap_t)); 74 kernel_map = (memmap_t*)kmalloc_aligned_int(sizeof(memmap_t));