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1 jermar 1 
/*
4015 decky 2 
 * Copyright (c) 2009 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genarch
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 * @{
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 */
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/** @file
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 */
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#include <genarch/multiboot/multiboot.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <config.h>
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#include <string.h>
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#include <macros.h>
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/** Extract command name from the multiboot module command line.
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 *
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 * @param buf      Destination buffer (will always NULL-terminate).
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 * @param sz       Size of destination buffer (in bytes).
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 * @param cmd_line Input string (the command line).
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 *
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 */
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static void extract_command(char *buf, size_t sz, const char *cmd_line)
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{
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    /* Find the first space. */
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    const char *end = str_chr(cmd_line, ' ');
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    if (end == NULL)
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        end = cmd_line + str_size(cmd_line);
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    /*
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     * Find last occurence of '/' before 'end'. If found, place start at
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     * next character. Otherwise, place start at beginning of buffer.
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     */
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    const char *cp = end;
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    const char *start = buf;
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    while (cp != start) {
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        if (*cp == '/') {
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            start = cp + 1;
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            break;
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        }
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        cp--;
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    }
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    /* Copy the command. */
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    str_ncpy(buf, sz, start, (size_t) (end - start));
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}
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/** Parse multiboot information structure.
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 *
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 * If @a signature does not contain a valid multiboot signature,
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 * assumes no multiboot information is available.
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 *
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 * @param signature Should contain the multiboot signature.
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 * @param mi        Pointer to the multiboot information structure.
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 */
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void multiboot_info_parse(uint32_t signature, const multiboot_info_t *mi)
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{
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    uint32_t flags;
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    if (signature == MULTIBOOT_LOADER_MAGIC)
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        flags = mi->flags;
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    else {
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        /* No multiboot info available. */
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        flags = 0;
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    }
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    /* Copy module information. */
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    uint32_t i;
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    if ((flags & MBINFO_FLAGS_MODS) != 0) {
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        init.cnt = min(mi->mods_count, CONFIG_INIT_TASKS);
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        multiboot_mod_t *mods
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            = (multiboot_mod_t *) MULTIBOOT_PTR(mi->mods_addr);
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        for (i = 0; i < init.cnt; i++) {
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            init.tasks[i].addr = PA2KA(mods[i].start);
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            init.tasks[i].size = mods[i].end - mods[i].start;
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            /* Copy command line, if available. */
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            if (mods[i].string) {
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                extract_command(init.tasks[i].name,
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                    CONFIG_TASK_NAME_BUFLEN,
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                    MULTIBOOT_PTR(mods[i].string));
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            } else
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                init.tasks[i].name[0] = 0;
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        }
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    } else
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        init.cnt = 0;
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    /* Copy memory map. */
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    if ((flags & MBINFO_FLAGS_MMAP) != 0) {
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        int32_t mmap_length = mi->mmap_length;
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        multiboot_mmap_t *mme = MULTIBOOT_PTR(mi->mmap_addr);
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        e820counter = 0;
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        i = 0;
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        while ((mmap_length > 0) && (i < MEMMAP_E820_MAX_RECORDS)) {
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            e820table[i++] = mme->mm_info;
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            /* Compute address of next structure. */
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            uint32_t size = sizeof(mme->size) + mme->size;
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            mme = ((void *) mme) + size;
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            mmap_length -= size;
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        }
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        e820counter = i;
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    } else
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        e820counter = 0;
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}
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/** @}
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 */