nuclear@90: /* This code is used by the kernel AND by userspace filesystem-related tools.
nuclear@90:  * The kernel-specific parts are conditionally compiled in #ifdef KERNEL blocks
nuclear@90:  * the rest of the code should be independent.
nuclear@90:  */
nuclear@88: #include <stdio.h>
nuclear@89: #include <stdlib.h>
nuclear@89: #include <assert.h>
nuclear@90: #include <errno.h>
nuclear@88: #include "fs.h"
nuclear@90: #include "part.h"
nuclear@90: 
nuclear@90: #ifdef KERNEL
nuclear@88: #include "ata.h"
nuclear@88: #include "panic.h"
nuclear@90: #endif
nuclear@89: 
nuclear@89: struct filesys {
nuclear@89: 	int dev;
nuclear@89: 	struct partition part;
nuclear@89: 
nuclear@89: 	struct superblock *sb;
nuclear@90: 
nuclear@90: 	struct filesys *next;
nuclear@89: };
nuclear@89: 
nuclear@89: static int find_rootfs(struct filesys *fs);
nuclear@90: static int readblock(int dev, uint32_t blk, void *buf);
nuclear@90: static int writeblock(int dev, uint32_t blk, void *buf);
nuclear@88: 
nuclear@88: /* root device & partition */
nuclear@90: static struct filesys *fslist;
nuclear@90: 
nuclear@90: int sys_mount(char *mtpt, char *devname, unsigned int flags)
nuclear@90: {
nuclear@90: 	if(strcmp(mtpt, "/") != 0) {
nuclear@90: 		printf("mount: only root can be mounted at the moment\n");
nuclear@90: 		return -EBUG;
nuclear@90: 	}
nuclear@90: 
nuclear@90: 	/* mounting root filesystem */
nuclear@90: 	if(fslist) {
nuclear@90: 
nuclear@90: }
nuclear@88: 
nuclear@88: void init_fs(void)
nuclear@88: {
nuclear@89: 	root.sb = malloc(512);
nuclear@89: 	assert(root.sb);
nuclear@89: 
nuclear@90: #ifdef KERNEL
nuclear@89: 	if(find_rootfs(&root) == -1) {
nuclear@88: 		panic("can't find root filesystem\n");
nuclear@88: 	}
nuclear@90: #endif
nuclear@88: }
nuclear@88: 
nuclear@90: 
nuclear@90: #ifdef KERNEL
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@90: 				readblock(i, p->start_sect / 2 + 1, 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: }
nuclear@90: 
nuclear@90: #define NSECT	(BLKSZ / 512)
nuclear@90: 
nuclear@90: static int readblock(struct block_device *bdev, uint32_t blk, void *buf)
nuclear@90: {
nuclear@90: 	return blk_read(bdev, blk, buf);
nuclear@90: }
nuclear@90: 
nuclear@90: static int writeblock(struct block_device *bdev, uint32_t blk, void *buf)
nuclear@90: {
nuclear@90: 	return blk_write(bdev, blk, buf);
nuclear@90: }
nuclear@90: #else
nuclear@90: 
nuclear@90: /* if this is compiled as part of the user-space tools instead of the kernel
nuclear@90:  * forward the call to a user read/write block function supplied by the app.
nuclear@90:  */
nuclear@90: int user_readblock(uint32_t, void*);
nuclear@90: int user_writeblock(uint32_t, void*);
nuclear@90: 
nuclear@90: static int readblock(struct block_device *bdev, uint32_t blk, void *buf)
nuclear@90: {
nuclear@90: 	return user_readblock(blk, buf);
nuclear@90: }
nuclear@90: 
nuclear@90: static int writeblock(struct block_device *bdev, uint32_t blk, void *buf)
nuclear@90: {
nuclear@90: 	return user_writeblock(blk, buf);
nuclear@90: }
nuclear@90: #endif	/* KERNEL */