nuclear@88: #include <stdio.h>
nuclear@89: #include <stdlib.h>
nuclear@89: #include <assert.h>
nuclear@88: #include "fs.h"
nuclear@88: #include "ata.h"
nuclear@88: #include "part.h"
nuclear@88: #include "panic.h"
nuclear@88: 
nuclear@89: #define MAGIC	0xccf5ccf5
nuclear@89: #define BLKSZ	1024
nuclear@88: 
nuclear@89: typedef uint32_t blkid;
nuclear@89: 
nuclear@89: struct superblock {
nuclear@89: 	uint32_t magic;
nuclear@89: 
nuclear@89: 	blkid istart;
nuclear@89: 	unsigned int icount;
nuclear@89: 
nuclear@89: 	blkid dstart;
nuclear@89: 	unsigned int dcount;
nuclear@89: };
nuclear@89: 
nuclear@89: struct filesys {
nuclear@89: 	int dev;
nuclear@89: 	struct partition part;
nuclear@89: 
nuclear@89: 	struct superblock *sb;
nuclear@89: };
nuclear@89: 
nuclear@89: static int find_rootfs(struct filesys *fs);
nuclear@88: 
nuclear@88: /* root device & partition */
nuclear@89: static struct filesys root;
nuclear@88: 
nuclear@88: void init_fs(void)
nuclear@88: {
nuclear@89: 	root.sb = malloc(512);
nuclear@89: 	assert(root.sb);
nuclear@89: 
nuclear@89: 	if(find_rootfs(&root) == -1) {
nuclear@88: 		panic("can't find root filesystem\n");
nuclear@88: 	}
nuclear@88: }
nuclear@88: 
nuclear@89: #define PART_TYPE	0xcc
nuclear@89: static int find_rootfs(struct filesys *fs)
nuclear@88: {
nuclear@88: 	int i, num_dev, partid;
nuclear@88: 	struct partition *plist, *p;
nuclear@88: 
nuclear@88: 	num_dev = ata_num_devices();
nuclear@88: 	for(i=0; i<num_dev; i++) {
nuclear@88: 		plist = p = get_part_list(i);
nuclear@88: 
nuclear@88: 		partid = 0;
nuclear@88: 		while(p) {
nuclear@88: 			if(get_part_type(p) == PART_TYPE) {
nuclear@89: 				/* found the correct partition, now read the superblock
nuclear@89: 				 * and make sure it's got the correct magic id
nuclear@89: 				 */
nuclear@89: 				ata_read_pio(i, p->start_sect + 2, fs->sb);
nuclear@89: 
nuclear@89: 				if(fs->sb->magic == MAGIC) {
nuclear@89: 					printf("found root ata%dp%d\n", i, partid);
nuclear@89: 					fs->dev = i;
nuclear@89: 					fs->part = *p;
nuclear@89: 					return 0;
nuclear@89: 				}
nuclear@88: 			}
nuclear@88: 			p = p->next;
nuclear@88: 			partid++;
nuclear@88: 		}
nuclear@88: 		free_part_list(plist);
nuclear@88: 	}
nuclear@88: 	return -1;
nuclear@88: }