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/*
* Copyright (c) 2025 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 <sys/types.h>
#include <sys/errno.h>
#include <sys/cdefs.h>
#include <os/omar.h>
#include <kern/panic.h>
#include <lib/limine.h>
#include <lib/string.h>
#define OMAR_EOF "RAMO"
#define OMAR_REG 0
#define OMAR_DIR 1
#define BLOCK_SIZE 512
static const char *omar_root = NULL;
static struct limine_module_response *mod_resp;
static volatile struct limine_module_request mod_req = {
.id = LIMINE_MODULE_REQUEST,
.revision = 0
};
/*
* The OMAR file header, describes the basics
* of a file.
*
* @magic: Header magic ("OMAR")
* @len: Length of the file
* @namelen: Length of the filename
* @rev: OMAR revision
* @mode: File permissions
*/
struct __packed omar_hdr {
char magic[4];
uint8_t type;
uint8_t namelen;
uint32_t len;
uint8_t rev;
uint32_t mode;
};
static void *
omar_mod_query(const char *path)
{
if (mod_resp == NULL || path == NULL) {
return NULL;
}
for (size_t i = 0; i < mod_resp->module_count; ++i) {
if (strcmp(mod_resp->modules[i]->path, path) == 0) {
return mod_resp->modules[i]->address;
}
}
return NULL;
}
int
omar_lookup(const char *path, struct initrd_node *res)
{
struct initrd_node node;
const struct omar_hdr *hdr;
const char *p, *name;
char namebuf[256];
off_t off;
if (*path++ != '/') {
return -ENOENT;
}
p = omar_root;
for (;;) {
hdr = (struct omar_hdr *)p;
if (strncmp(hdr->magic, OMAR_EOF, sizeof(OMAR_EOF)) == 0) {
break;
}
/* Ensure the file is valid */
if (strncmp(hdr->magic, "OMAR", 4) != 0) {
/* Bad magic */
return -EINVAL;
}
if (hdr->namelen > sizeof(namebuf) - 1) {
return -EINVAL;
}
name = (char *)p + sizeof(struct omar_hdr);
memcpy(namebuf, name, hdr->namelen);
namebuf[hdr->namelen] = '\0';
/* Compute offset to next block */
if (hdr->type == OMAR_DIR) {
off = 512;
} else {
off = ALIGN_UP(sizeof(*hdr) + hdr->namelen + hdr->len, BLOCK_SIZE);
}
/* Skip header and name, right to the data */
p = (char *)hdr + sizeof(struct omar_hdr);
p += hdr->namelen;
if (strcmp(namebuf, path) == 0) {
node.mode = hdr->mode;
node.size = hdr->len;
node.data = (void *)p;
*res = node;
return 0;
}
hdr = (struct omar_hdr *)((char *)hdr + off);
p = (char *)hdr;
memset(namebuf, 0, sizeof(namebuf));
}
return -ENOENT;
}
void
omar_init(void)
{
struct initrd_node node;
mod_resp = mod_req.response;
if (mod_resp == NULL) {
panic("omar: could not get module response\n");
}
omar_root = omar_mod_query("/boot/initramfs.omar");
if (omar_root == NULL) {
panic("omar: could not read /boot/initramfs.omar\n");
}
}
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