linux.c

Hermit-at-1.1.3,一款bootloader

/*
 * Copyright (c) 2004-2005 Atmark Techno, Inc.  All Rights Reserved.
 */

#include <ep93xx/ioregs.h>
#include <ep93xx/memcpy.h>
#include <target/herrno.h>
#include <target/io.h>
#include <target/scan.h>
#include <target/str.h>
#include <target/buffer.h>
#include <target/memcmp.h>
#include <target/setenv.h>
#include <target/atag.h>
#include <target/gunzip.h>
#include "linux.h"
#include "memmap.h"
#include <target/memzero.h>
#include <target/flash.h>
#include "mmu.h"

/* for setting the root device */
#define MINORBITS       8
#define MKDEV(ma,mi)    (((ma) << MINORBITS) | (mi))

#define RAMDISK_MAJOR   1	/* major for "RAM disk" */
#define RAMDISK0_MINOR	0	/* b 1 0 == /dev/ram0 */

#define ROM_FLASH_MAJOR	31	/* major for "ROM/flash memory card" */
#define FLASH0_MINOR	16	/* b 31 16 == /dev/flash0 */
#define FLASH1_MINOR	17	/* b 31 17 == /dev/flash1 */

#define IDE0_MAJOR      3
#define IDE1_MAJOR      22

static int major = RAMDISK_MAJOR;
static int minor = RAMDISK0_MINOR;

#define COMMAND_LINE_SIZE 1024

extern unsigned long bytes_out;

#define PBDR_FLASHBOOT  0x40

#define SECTOR_SIZE     0x200
#define INODE_SIZE      0x80

#define read4_little_endian(cp) ((unsigned long)(cp[0]) + \
                                 ((unsigned long)(cp[1]) << 8) + \
                                 ((unsigned long)(cp[2]) << 16) + \
                                 ((unsigned long)(cp[3]) << 24))

#define IDE_MAX_DEVICES 2
extern int ide_detect_devices (int device);
extern int ide_startup_devices (void);
extern int ide_read_sectors (int dev, unsigned long lba,
			     unsigned char *buf, int count);

typedef struct {
  unsigned char boot_ind;
  unsigned char head;
  unsigned char sector;
  unsigned char cyl;
  unsigned char sys_ind;
  unsigned char end_head;
  unsigned char end_sector;
  unsigned char end_cylinder;
  unsigned char start4[4];
  unsigned char size4[4];
} partition;

typedef struct {
  unsigned long  s_inodes_count;
  unsigned long  s_blocks_count;
  unsigned long  s_r_blocks_count;
  unsigned long  s_free_blocks_count;
  unsigned long  s_free_inodes_count;
  unsigned long  s_first_data_block;
  unsigned long  s_log_block_size;
  unsigned long  s_log_frag_size;
  unsigned long  s_blocks_per_group;
  unsigned long  s_frags_per_group;
  unsigned long  s_inodes_per_group;
  unsigned long  s_mtime;
  unsigned long  s_wtime;
  unsigned short s_mnt_count;
  unsigned short s_max_mnt_count;
  unsigned short s_magic;
  unsigned short s_state;
  unsigned short s_errors;
  unsigned short s_minor_rev_level;
  unsigned long  s_lastcheck;
  unsigned long  s_checkinterval;
  unsigned long  s_creator_os;
  unsigned long  s_rev_level;
  unsigned short s_def_resuid;
  unsigned short s_def_resgid;
  unsigned long  s_first_ino;
  unsigned short s_inode_size;
  unsigned short s_block_group_nr;
  unsigned long  s_feature_compat;
  unsigned long  s_feature_incompat;
  unsigned long  s_feature_ro_compat;
  unsigned char  s_uuid[16];
  char           s_volume_name[16];
  char           s_last_mounted[64];
  unsigned long  s_algorithm_usage_bitmap;
  unsigned char  s_prealloc_blocks;
  unsigned char  s_prealloc_dir_blocks;
  unsigned short s_padding1;
  unsigned long  s_reserved[204];
} ext2_super_block;

typedef struct {
  unsigned long  bg_block_bitmap;
  unsigned long  bg_inode_bitmap;
  unsigned long  bg_inode_table;
  unsigned short bg_free_blocks_count;
  unsigned short bg_free_inodes_count;
  unsigned short bg_used_dirs_count;
  unsigned short bg_pad;
  unsigned long  bg_reserved[3];
} ext2_group_desc;

typedef struct {
  unsigned short i_mode;
  unsigned short i_uid;
  unsigned long  i_size;
  unsigned long  i_atime;
  unsigned long  i_ctime;
  unsigned long  i_mtime;
  unsigned long  i_dtime;
  unsigned short i_gid;
  unsigned short i_links_count;
  unsigned long  i_blocks;
  unsigned long  i_flags;
  union {
    struct {
      unsigned long l_i_reserved1;
    } linux1;
    struct {
      unsigned long h_i_translator;
    } hurd1;
    struct {
      unsigned long m_i_reserved1;
    } masix1;
  } osd1;
  unsigned long  i_block[15];
  unsigned long  i_generation;
  unsigned long  i_file_acl;
  unsigned long  i_dir_acl;
  unsigned long  i_faddr;
  union {
    struct {
      unsigned char  l_i_frag;
      unsigned char  l_i_fsize;
      unsigned short i_pad1;
      unsigned short l_i_uid_high;
      unsigned short l_i_gid_high;
      unsigned long  l_i_reserved2;
    } linux2;
    struct {
      unsigned char  h_i_frag;
      unsigned char  h_i_fsize;
      unsigned short h_i_mode_high;
      unsigned short h_i_uid_high;
      unsigned short h_i_gid_high;
      unsigned long  h_i_author;
    } hurd2;
    struct {
      unsigned char  m_i_frag;
      unsigned char  m_i_fsize;
      unsigned short m_pad1;
      unsigned long  m_i_reserved2[2];
    } masix2;
  } osd2;
} ext2_inode;

typedef struct {
  unsigned long  inode;
  unsigned short rec_len;
  unsigned short name_len;
  char           name[255];
} ext2_dir_entry;

static int linux_cmdfunc(int argc, char *argv[])
{
	struct tag *tag = (struct tag *) LINUX_PARAM_ADDRESS;

	/* zero param block */
	memzero (tag, LINUX_PARAM_SIZE);

	/* set up core tag */
	tag->hdr.tag = ATAG_CORE;
	tag->hdr.size = tag_size(tag_core);
	tag->u.core.flags = 0;
	tag->u.core.pagesize = 0x1000;
	tag->u.core.rootdev = MKDEV(major, minor);

	/* 32 MB of SDRAM at 0xc0000000 */
	tag = tag_next(tag);
	tag->hdr.tag = ATAG_MEM;
	tag->hdr.size = tag_size(tag_mem32);
	tag->u.mem.size = DRAM1_SIZE;
	tag->u.mem.start = DRAM1_START;

	/* 32 MB of SDRAM at 0xc4000000 */
	tag = tag_next(tag);
	tag->hdr.tag = ATAG_MEM;
	tag->hdr.size = tag_size(tag_mem32);
	tag->u.mem.size = DRAM2_SIZE;
	tag->u.mem.start = DRAM2_START;

	if (major == RAMDISK_MAJOR) {
	  /* an initial ramdisk image in flash at 0x00700000 */
	  tag = tag_next(tag);
	  tag->hdr.tag = ATAG_INITRD;
	  tag->hdr.size = tag_size(tag_initrd);
	  tag->u.initrd.start = INITRD_LOAD_ADDRESS;
	  tag->u.initrd.size  = bytes_out;
	}

	/* the command line arguments */
	if (argc > 1) {
		tag = tag_next(tag);
		tag->hdr.tag = ATAG_CMDLINE;
		tag->hdr.size = (COMMAND_LINE_SIZE + 3 +
			 sizeof(struct tag_header)) >> 2;

		{
			const unsigned char *src;
			unsigned char *dst;
			dst = tag->u.cmdline.cmdline;
			memzero (dst, COMMAND_LINE_SIZE);
			while (--argc > 0) {
				src = *++argv;
				hprintf ("Doing %s\n", src);
				while (*src)
					*dst++ = *src++;
				*dst++ = ' ';
			}
			*--dst = '\0';
		}
	}

	tag = tag_next(tag);
	tag->hdr.tag = 0;
	tag->hdr.size = 0;

	/* branch to kernel image */
	__asm__ volatile (
	"	mov	r4, #0xC0000000\n"	/* start of DRAM */
	"	add	r4, r4, #0x00018000\n"	/* kernel offset */
	"	mov	r0, #0\n"		/* kernel sanity check */
	"	mov	r1, #256\n"
	"	orr     r1, r1, #130\n"		/* armadillo arch. number */
	"	mov	r2, #0\n"
	"	mov	r3, #0\n"
	"	mov	pc, r4"			/* go there! */
	);

	/* never get here */
	return 0;
}

static int copy_file (unsigned long  count, unsigned long table[],
			unsigned long start, unsigned long sectors_per_block,
			unsigned long *pfile_size, addr_t *pload_address)
{
  int           i;
  unsigned long file_data_sector, copy_size;
  unsigned char buf[SECTOR_SIZE * 8];
  
  hprintf (".");
  
  for (i = 0; i < count && *pfile_size > 0; i++) {
    file_data_sector = start + sectors_per_block * table[i];
    if (ide_read_sectors (0, file_data_sector, buf, sectors_per_block)) {
      return -1;
    }
    copy_size = (*pfile_size > SECTOR_SIZE * sectors_per_block) ?
      (SECTOR_SIZE * sectors_per_block) : *pfile_size;
    memcpy ((unsigned char *)*pload_address, buf, copy_size);
    *pfile_size -= copy_size;
    *pload_address += copy_size;
  }
  
  return 0;
}

char mtdparts[] = { MTDPARTS };
char console[] = { "console=ttyAM0,115200" };

static int boot_cmdfunc(int argc, char *argv[])
{
	int gunzip_kernel = 1;

	unsigned char    buf[SECTOR_SIZE * 8], buf2[SECTOR_SIZE * 8];
	partition        part[4];
	int              i, j, gzimage = 0, ext = 0, d;
	char             filename[16];
	unsigned long    start, size, super_block_sector, sectors_per_block,
	  blocks_per_group, inodes_per_group, group_desc_sector,
	  first_inode_table, inode_table_sector, dir_entry_table_sector,
	  inode, group, file_size, file_block[15], file_data_sector,
	  addr_per_block;
	ext2_super_block *psb;
	ext2_group_desc  *pgd;
	ext2_inode       *pinode;
	ext2_dir_entry   *pde = 0;
	addr_t           load_address;
	int              o_argc;

	if (argc > 1) {
	  o_argc = argc;
	}