diff options
Diffstat (limited to 'common/initrd.c')
| -rw-r--r-- | common/initrd.c | 59 |
1 files changed, 53 insertions, 6 deletions
diff --git a/common/initrd.c b/common/initrd.c index e3e6d94..2a254f1 100644 --- a/common/initrd.c +++ b/common/initrd.c @@ -10,24 +10,58 @@ #include <apos/attrs.h> #include <libfdt.h> -/* GNU cpio, use POSIX 'newc' format */ +/** GNU cpio, POSIX 'newc' format header. */ struct __packed cpio_header { + /** Magic bytes. */ char c_magic[6]; + + /** File inode. */ char c_ino[8]; + + /** File type and permissions. */ char c_mode[8]; + + /** User ID. */ char c_uid[8]; + + /** Group ID. */ char c_gid[8]; + + /** Number of links to this file. */ char c_nlink[8]; + + /** Modification time. */ char c_mtime[8]; + + /** Size of file. */ char c_filesize[8]; + + /** Device major. */ char c_devmajor[8]; + + /** Device minor. */ char c_devminor[8]; + + /** Block device major. */ char c_rdevmajor[8]; + + /** Block device minor. */ char c_rdevminor[8]; + + /** Length of filename. */ char c_namesize[8]; + + /** CRC check. */ char c_check[8]; }; +/** + * Get next file in archive. + * Does not check for out of bounds. + * + * @param cp Pointer to current file header. + * @return Pointer to next file header. + */ static struct cpio_header *__next_entry(struct cpio_header *cp) { size_t blen = align_up( @@ -37,6 +71,14 @@ static struct cpio_header *__next_entry(struct cpio_header *cp) return (struct cpio_header *)(((char *)cp) + blen + tlen); } +/** + * Get file with name in archive. + * + * @param c Pointer to initrd. + * @param fname Filename to look for. + * @param fname_len Length of filename. + * @return Pointer to corresponding file header if found, \c NULL otherwise. + */ static struct cpio_header *__find_file(const char *c, const char *fname, size_t fname_len) { @@ -44,7 +86,7 @@ static struct cpio_header *__find_file(const char *c, const char *fname, for (; cp; cp = __next_entry(cp)) { size_t namelen = convnum(cp->c_namesize, 8, 16); if (namelen == 0) - return 0; + return NULL; if (namelen < fname_len) continue; @@ -57,9 +99,15 @@ static struct cpio_header *__find_file(const char *c, const char *fname, return cp; } - return 0; + return NULL; } +/** Name of \c init program. */ +static char init_n[] = "init"; + +/** Length of \c init name. */ +static size_t init_nlen = ARRAY_SIZE(init_n) - 1; /* ignore trailing NULL */ + pm_t get_initrdtop(const void *fdt) { int chosen_offset = fdt_path_offset(fdt, "/chosen"); @@ -83,8 +131,6 @@ pm_t get_initrdbase(const void *fdt) return (pm_t)__va(fdt_load_int_ptr(ci.addr_cells, initrd_base_ptr)); } -static char init_n[] = "init"; -static size_t init_nlen = ARRAY_SIZE(init_n) - 1; /* ignore trailing NULL */ size_t get_init_size(const void *fdt) { @@ -101,7 +147,7 @@ vm_t get_init_base(const void *fdt) return ((vm_t)cp) + align_up(sizeof(struct cpio_header) + name_len, 4); } -void move_init(const void *fdt, void *target) +stat_t move_init(const void *fdt, void *target) { const char *c = (const char *)get_initrdbase(fdt); @@ -113,4 +159,5 @@ void move_init(const void *fdt, void *target) fp += align_up(sizeof(struct cpio_header) + name_len, 4); memmove(target, fp, file_len); + return OK; } |