abootLoader 固件源代码 HP内部珍贵资料！.rar

/* * This code is based on the ISO filesystem support in MILO (by * Dave Rusling). * * This is a set of functions that provides minimal filesystem * functionality to the Linux bootstrapper. All we can do is * open and read files... but that's all we need 8-) */ #ifndef TESTING # include <linux/string.h> #endif #include <linux/kernel.h> #include <linux/config.h> #include <linux/types.h> #include <linux/stat.h> #include <linux/kdev_t.h> #include <asm/page.h> #include <iso.h> #include <isolib.h> #include <utils.h> /* iso9660 support code */ #define MAX_OPEN_FILES 5 static struct inode_table_entry { struct iso_inode inode; int inumber; int free; unsigned short old_mode; unsigned size; int nlink; int mode; void *start; } inode_table[MAX_OPEN_FILES]; static unsigned long root_inode = 0; static struct isofs_super_block sb; static char data_block[1024]; static char big_data_block[2048]; #ifndef S_IRWXUGO # define S_IRWXUGO (S_IRWXU|S_IRWXG|S_IRWXO) # define S_IXUGO (S_IXUSR|S_IXGRP|S_IXOTH) # define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH) #endif extern long iso_dev_read (void * buf, long offset, long size); static int parse_rock_ridge_inode(struct iso_directory_record * de, struct iso_inode * inode); static char *get_rock_ridge_symlink(struct iso_inode *inode); static int get_rock_ridge_filename(struct iso_directory_record * de, char * retname, struct iso_inode * inode); int isonum_711 (char * p) { return (*p & 0xff); } int isonum_712 (char * p) { int val; val = *p; if (val & 0x80) val |= 0xffffff00; return val; } int isonum_721 (char * p) { return ((p[0] & 0xff) | ((p[1] & 0xff) << 8)); } int isonum_722 (char * p) { return (((p[0] & 0xff) << 8) | (p[1] & 0xff)); } int isonum_723 (char * p) { return isonum_721(p); } int isonum_731 (char * p) { return ((p[0] & 0xff) | ((p[1] & 0xff) << 8) | ((p[2] & 0xff) << 16) | ((p[3] & 0xff) << 24)); } int isonum_732 (char * p) { return (((p[0] & 0xff) << 24) | ((p[1] & 0xff) << 16) | ((p[2] & 0xff) << 8) | (p[3] & 0xff)); } int isonum_733 (char * p) { return isonum_731(p); } static int iso_bmap (struct iso_inode *inode, int block) { if (block < 0) { printf("iso_bmap: block<0"); return 0; } return (inode->i_first_extent >> sb.s_blocksize_bits) + block; } static int iso_breadi (struct iso_inode *ip, long blkno, long nblks, char * buffer) { long i_size, abs_blkno; /* do some error checking */ if (!ip || !ip->i_first_extent) return -1; i_size = ((struct inode_table_entry *) ip)->size; /* as in ext2.c - cons_read() doesn't really cope well with EOF conditions - actually it should be fixed */ if ((blkno+nblks) * sb.s_blocksize > i_size) nblks = ((i_size + sb.s_blocksize) / sb.s_blocksize) - blkno; /* figure out which iso block number(s) we're being asked for */ abs_blkno = iso_bmap(ip, blkno); if (!abs_blkno) return -1; /* now try and read them (easy since ISO files are continguous) */ return iso_dev_read(buffer, abs_blkno * sb.s_blocksize, nblks * sb.s_blocksize); } /* * Release our hold on an inode. Since this is a read-only application, * don't worry about putting back any changes... */ static void iso_iput (struct iso_inode *ip) { struct inode_table_entry *itp; /* Find and free the inode table slot we used... */ itp = (struct inode_table_entry *) ip; itp->inumber = 0; itp->free = 1; } /* * Read the specified inode from the disk and return it to the user. * Returns NULL if the inode can't be read... * * Uses data_block */ static struct iso_inode * iso_iget (int ino) { int i; struct iso_inode *inode; struct inode_table_entry *itp; struct iso_directory_record * raw_inode; unsigned char *pnt = NULL; void *cpnt = NULL; int high_sierra; int block; #ifdef DEBUG_ISO printf("iso_iget(ino=%d)\n", ino); #endif /* find a free inode to play with */ inode = NULL; itp = NULL; for (i = 0; i < MAX_OPEN_FILES; i++) { if (inode_table[i].free) { itp = &(inode_table[i]); inode = &(itp->inode); break; } } if ((inode == NULL) || (itp == NULL)) { printf("iso9660 (iget): no free inodes\n"); return (NULL); } block = ino >> sb.s_blocksize_bits; if (iso_dev_read(data_block, block * sb.s_blocksize, sb.s_blocksize) != sb.s_blocksize) { printf("iso9660: unable to read i-node block"); return NULL; } pnt = ((unsigned char *) data_block + (ino & (sb.s_blocksize - 1))); raw_inode = ((struct iso_directory_record *) pnt); high_sierra = sb.s_high_sierra; if ((ino & (sb.s_blocksize - 1)) + *pnt > sb.s_blocksize){ int frag1, offset; offset = (ino & (sb.s_blocksize - 1)); frag1 = sb.s_blocksize - offset; cpnt = big_data_block; memcpy(cpnt, data_block + offset, frag1); offset += *pnt - sb.s_blocksize; /* DUH! pnt would get wiped out by the iso_dev_read here. */ if (iso_dev_read(data_block, ++block * sb.s_blocksize, sb.s_blocksize) != sb.s_blocksize) { printf("unable to read i-node block"); return NULL; } memcpy((char *)cpnt+frag1, data_block, offset); pnt = ((unsigned char *) cpnt); raw_inode = ((struct iso_directory_record *) pnt); } if (raw_inode->flags[-high_sierra] & 2) { itp->mode = S_IRUGO | S_IXUGO | S_IFDIR; itp->nlink = 1; /* Set to 1. We know there are 2, but the find utility tries to optimize if it is 2, and it screws up. It is easier to give 1 which tells find to do it the hard way. */ } else { itp->mode = sb.s_mode; /* Everybody gets to read the file. */ itp->nlink = 1; itp->mode |= S_IFREG; /* * If there are no periods in the name, then set the * execute permission bit */ for(i=0; i< raw_inode->name_len[0]; i++) if(raw_inode->name[i]=='.' || raw_inode->name[i]==';') break; if(i == raw_inode->name_len[0] || raw_inode->name[i] == ';') itp->mode |= S_IXUGO; /* execute permission */ } itp->size = isonum_733 (raw_inode->size); /* There are defective discs out there - we do this to protect ourselves. A cdrom will never contain more than 700Mb */ if((itp->size < 0 || itp->size > 700000000) && sb.s_cruft == 'n') { printf("Warning: defective cdrom. " "Enabling \"cruft\" mount option.\n"); sb.s_cruft = 'y'; } /* * Some dipshit decided to store some other bit of information * in the high byte of the file length. Catch this and * holler. WARNING: this will make it impossible for a file * to be > 16Mb on the CDROM!!! */ if(sb.s_cruft == 'y' && itp->size & 0xff000000) { itp->size &= 0x00ffffff; } if (raw_inode->interleave[0]) { printf("Interleaved files not (yet) supported.\n"); itp->size = 0; } /* I have no idea what file_unit_size is used for, so we will flag it for now */ if (raw_inode->file_unit_size[0] != 0){ printf("File unit size != 0 for ISO file (%d).\n", ino); } /* I have no idea what other flag bits are used for, so we will flag it for now */ #ifdef DEBUG_ISO if ((raw_inode->flags[-high_sierra] & ~2)!= 0){ printf("Unusual flag settings for ISO file (%d %x).\n", ino, raw_inode->flags[-high_sierra]); } #endif inode->i_first_extent = (isonum_733 (raw_inode->extent) + isonum_711 (raw_inode->ext_attr_length)) << sb.s_log_zone_size; /* Now we check the Rock Ridge extensions for further info */ if (sb.s_rock) parse_rock_ridge_inode(raw_inode,inode); /* Will be used for previous directory */ inode->i_backlink = 0xffffffff; switch (sb.s_conversion) { case 'a': inode->i_file_format = ISOFS_FILE_UNKNOWN; /* File type */ break; case 'b': inode->i_file_format = ISOFS_FILE_BINARY; /* File type */ break; case 't': inode->i_file_format = ISOFS_FILE_TEXT; /* File type */ break; case 'm': inode->i_file_format = ISOFS_FILE_TEXT_M; /* File type */ break; } /* keep our inode tab