diff options
Diffstat (limited to 'sys/fs/initramfs.c')
| -rw-r--r-- | sys/fs/initramfs.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/sys/fs/initramfs.c b/sys/fs/initramfs.c deleted file mode 100644 index e15c00d..0000000 --- a/sys/fs/initramfs.c +++ /dev/null @@ -1,262 +0,0 @@ -/* - * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Hyra nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -#include <fs/initramfs.h> -#include <sys/cdefs.h> -#include <sys/types.h> -#include <sys/limine.h> -#include <sys/errno.h> -#include <sys/panic.h> -#include <sys/vfs.h> -#include <sys/vnode.h> -#include <vm/dynalloc.h> -#include <string.h> - -__MODULE_NAME("initramfs"); -__KERNEL_META("$Hyra$: initramfs.c, Ian Marco Moffett, " - "Initial ram filesystem"); - -static volatile struct limine_module_request mod_req = { - .id = LIMINE_MODULE_REQUEST, - .revision = 0 -}; - -static const char *initramfs = NULL; -static size_t initramfs_size = 0; - -#define TAR_TYPEFLAG_NORMAL '0' -#define TAR_TYPEFLAG_HARDLINK '1' -#define TAR_TYPEFLAG_DIR '5' - -struct tar_hdr { - char filename[100]; - char mode[8]; - char uid[8]; - char gid[8]; - char size[12]; - char mtime[12]; - char checksum[8]; - char type; - char link_name[100]; - char magic[6]; - char version[2]; - char uname[32]; - char gname[32]; - char dev_major[8]; - char dev_minor[8]; - char prefix[155]; -}; - -static struct tar_hdr *initramfs_from_path(struct tar_hdr *hdr, - const char *path); - -static size_t -getsize(const char *in); - -static inline char * -hdr_to_contents(struct tar_hdr *hdr) -{ - return ((char*)hdr) + 0x200; -} - -static int -vop_vget(struct vnode *parent, const char *name, struct vnode **vp) -{ - struct tar_hdr *hdr; - struct vnode *vnode; - int status; - int vtype = VREG; - - if (initramfs == NULL) { - return -EIO; - } - - hdr = initramfs_from_path((void *)initramfs, name); - - if (hdr == NULL) { - return -ENOENT; - } - - if (hdr->type == TAR_TYPEFLAG_DIR) { - vtype = VDIR; - } - - /* Allocate vnode for this file */ - if ((status = vfs_alloc_vnode(&vnode, NULL, vtype)) != 0) { - return status; - } - - vnode->parent = parent; - vnode->data = hdr; - - vnode->vops = &g_initramfs_vops; - *vp = vnode; - return 0; -} - -static int -vop_read(struct vnode *vp, struct sio_txn *sio) -{ - struct tar_hdr *hdr; - size_t size; - char *contents; - char *buf = sio->buf; - - if (vp->data == NULL) { - return -EIO; - } - - hdr = vp->data; - size = getsize(hdr->size); - contents = hdr_to_contents(hdr); - - for (size_t i = sio->offset; i < sio->len; ++i) { - if (i >= size) { - return i + 1; - } - buf[i - sio->offset] = contents[i]; - } - - return sio->len; -} - -static int -vop_getattr(struct vnode *vp, struct vattr *vattr) -{ - struct tar_hdr *hdr = vp->data; - - if (hdr == NULL) { - return -EIO; - } - - switch (hdr->type) { - case TAR_TYPEFLAG_NORMAL: - vattr->type = VREG; - break; - case TAR_TYPEFLAG_DIR: - vattr->type = VDIR; - break; - } - - vattr->size = getsize(hdr->size); - return 0; -} - -static char * -get_module(const char *path, uint64_t *size) { - for (uint64_t i = 0; i < mod_req.response->module_count; ++i) { - if (strcmp(mod_req.response->modules[i]->path, path) == 0) { - *size = mod_req.response->modules[i]->size; - return mod_req.response->modules[i]->address; - } - } - - return NULL; -} - -static size_t -getsize(const char *in) -{ - size_t size = 0, count = 1; - - for (size_t j = 11; j > 0; --j, count *= 8) { - size += (in[j-1]-'0')*count; - } - - return size; -} - -static int -initramfs_init(struct fs_info *info, struct vnode *source) -{ - if (source != NULL) - return -EINVAL; - - initramfs = get_module("/boot/initramfs.tar", &initramfs_size); - info->caps = FSCAP_FULLPATH; - - if (initramfs == NULL) { - panic("Failed to load initramfs\n"); - } - - return 0; -} - -static struct tar_hdr * -initramfs_from_path(struct tar_hdr *hdr, const char *path) -{ - - uintptr_t addr = (uintptr_t)hdr; - size_t size; - - if (*path != '/') { - return NULL; - } - ++path; - - while (strcmp(hdr->magic, "ustar") == 0) { - size = getsize(hdr->size); - - if (strcmp(hdr->filename, path) == 0) { - return hdr; - } - - addr += 512 + __ALIGN_UP(size, 512); - hdr = (struct tar_hdr *)addr; - } - - return NULL; -} - -const char * -initramfs_open(const char *path) -{ - struct tar_hdr *hdr; - - if (initramfs == NULL) { - return NULL; - } - - if (strlen(path) > 99) { - return NULL; - } - - hdr = initramfs_from_path((void *)initramfs, path); - return (hdr == NULL) ? NULL : hdr_to_contents(hdr); -} - -struct vfsops g_initramfs_ops = { - .init = initramfs_init, -}; - -struct vops g_initramfs_vops = { - .vget = vop_vget, - .read = vop_read, - .getattr = vop_getattr -}; |