/*
* Copyright (c) 2009 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup kernel_genarch
* @{
*/
/** @file
*/
#include <typedefs.h>
#include <genarch/multiboot/multiboot.h>
#include <config.h>
#include <stddef.h>
#include <str.h>
/** Extract command name from the multiboot module command line.
*
* @param buf Destination buffer (will be always NULL-terminated).
* @param size Size of destination buffer (in bytes).
* @param cmd_line Input string (the command line).
*
*/
void multiboot_extract_command(char *buf, size_t size, const char *cmd_line)
{
/* Find the first space. */
const char *end = str_chr(cmd_line, ' ');
if (end == NULL)
end = cmd_line + str_size(cmd_line);
/*
* Find last occurence of '/' before 'end'. If found, place start at
* next character. Otherwise, place start at beginning of command line.
*/
const char *cp = end;
const char *start = cmd_line;
while (cp != start) {
if (*cp == '/') {
start = cp + 1;
break;
}
cp--;
}
/* Copy the command. */
str_ncpy(buf, size, start, (size_t) (end - start));
}
/** Extract arguments from the multiboot module command line.
*
* @param buf Destination buffer (will be always NULL-terminated).
* @param size Size of destination buffer (in bytes).
* @param cmd_line Input string (the command line).
*
*/
void multiboot_extract_argument(char *buf, size_t size, const char *cmd_line)
{
/* Start after first space. */
const char *start = str_chr(cmd_line, ' ');
if (start == NULL) {
str_cpy(buf, size, "");
return;
}
const char *end = cmd_line + str_size(cmd_line);
/* Skip the space(s). */
while (start != end) {
if (start[0] == ' ')
start++;
else
break;
}
str_ncpy(buf, size, start, (size_t) (end - start));
}
static void multiboot_modules(uint32_t count, multiboot_module_t *mods)
{
for (uint32_t i = 0; i < count; i++) {
if (init.cnt >= CONFIG_INIT_TASKS)
break;
init.tasks[init.cnt].paddr = mods[i].start;
init.tasks[init.cnt].size = mods[i].end - mods[i].start;
/* Copy command line, if available. */
if (mods[i].string) {
multiboot_extract_command(init.tasks[init.cnt].name,
CONFIG_TASK_NAME_BUFLEN, MULTIBOOT_PTR(mods[i].string));
multiboot_extract_argument(init.tasks[init.cnt].arguments,
CONFIG_TASK_ARGUMENTS_BUFLEN, MULTIBOOT_PTR(mods[i].string));
} else {
init.tasks[init.cnt].name[0] = 0;
init.tasks[init.cnt].arguments[0] = 0;
}
init.cnt++;
}
}
static void multiboot_memmap(uint32_t length, multiboot_memmap_t *memmap)
{
uint32_t pos = 0;
while ((pos < length) && (e820counter < MEMMAP_E820_MAX_RECORDS)) {
e820table[e820counter] = memmap->mm_info;
/* Compute address of next structure. */
uint32_t size = sizeof(memmap->size) + memmap->size;
memmap = (multiboot_memmap_t *) ((uintptr_t) memmap + size);
pos += size;
e820counter++;
}
}
/** Parse multiboot information structure.
*
* If @a signature does not contain a valid multiboot signature,
* assumes no multiboot information is available.
*
* @param signature Should contain the multiboot signature.
* @param info Multiboot information structure.
*
*/
void multiboot_info_parse(uint32_t signature, const multiboot_info_t *info)
{
if (signature != MULTIBOOT_LOADER_MAGIC)
return;
/* Copy command line. */
if ((info->flags & MULTIBOOT_INFO_FLAGS_CMDLINE) != 0)
multiboot_cmdline((char *) MULTIBOOT_PTR(info->cmd_line));
/* Copy modules information. */
if ((info->flags & MULTIBOOT_INFO_FLAGS_MODS) != 0)
multiboot_modules(info->mods_count,
(multiboot_module_t *) MULTIBOOT_PTR(info->mods_addr));
/* Copy memory map. */
if ((info->flags & MULTIBOOT_INFO_FLAGS_MMAP) != 0)
multiboot_memmap(info->mmap_length,
(multiboot_memmap_t *) MULTIBOOT_PTR(info->mmap_addr));
}
/** @}
*/