root / prex-0.9.0 / bsp / boot / common / load.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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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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* 1. 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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* 2. 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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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* load.c - Load OS modules
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*/
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#include <boot.h> |
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#include <load.h> |
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#include <sys/ar.h> |
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#include <sys/bootinfo.h> |
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/* forward declarations */
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static int load_module(struct ar_hdr *, struct module *); |
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static void setup_bootdisk(struct ar_hdr *); |
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paddr_t load_base; /* current load address */
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paddr_t load_start; /* start address for loading */
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int nr_img; /* number of module images */ |
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/*
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* Load OS images - kernel, driver and boot tasks.
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*
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* It reads each module file image and copy it to the appropriate
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* memory area. The image is built as generic an archive (.a) file.
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*
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* The image information is stored into the boot information area.
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*/
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void
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load_os(void)
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{ |
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char *hdr;
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struct bootinfo *bi = bootinfo;
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struct module *m;
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char *magic;
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int i;
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long len;
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/*
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* Initialize our data.
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*/
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load_base = 0;
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load_start = 0;
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nr_img = 0;
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/*
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* Sanity check of archive image.
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*/
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magic = (char *)kvtop(CONFIG_BOOTIMG_BASE);
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if (strncmp(magic, ARMAG, 8)) |
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panic("Invalid OS image");
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/*
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* Load kernel module.
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*/
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hdr = (char *)((paddr_t)magic + 8); |
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if (load_module((struct ar_hdr *)hdr, &bi->kernel)) |
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panic("Can not load kernel");
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/*
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* Load driver module.
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*/
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len = atol((char *)&((struct ar_hdr *)hdr)->ar_size); |
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len += len % 2; /* even alignment */ |
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if (len == 0) |
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panic("Invalid driver image");
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hdr = (char *)((paddr_t)hdr + sizeof(struct ar_hdr) + len); |
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if (load_module((struct ar_hdr *)hdr, &bi->driver)) |
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panic("Can not load driver");
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/*
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* Load boot tasks.
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*/
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i = 0;
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m = (struct module *)&bi->tasks[0]; |
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while (1) { |
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/* Proceed to next archive header */
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len = atol((char *)&((struct ar_hdr *)hdr)->ar_size); |
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len += len % 2; /* even alignment */ |
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if (len == 0) |
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break;
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hdr = (char *)((paddr_t)hdr + sizeof(struct ar_hdr) + len); |
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/* Check archive header */
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if (strncmp((char *)&((struct ar_hdr *)hdr)->ar_fmag, |
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ARFMAG, 2))
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break;
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/* Load boot disk image */
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if (!strncmp((char *)&((struct ar_hdr *)hdr)->ar_name, |
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"bootdisk.a", 10)) { |
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setup_bootdisk((struct ar_hdr *)hdr);
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continue;
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} |
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/* Load task */
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if (load_module((struct ar_hdr *)hdr, m)) |
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break;
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i++; |
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m++; |
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} |
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bi->nr_tasks = i; |
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if (bi->nr_tasks == 0) |
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panic("No boot task found!");
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/*
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* Reserve single memory block for all boot modules.
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* This includes kernel, driver, and boot tasks.
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*/
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i = bi->nr_rams; |
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bi->ram[i].base = load_start; |
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bi->ram[i].size = (size_t)(load_base - load_start); |
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bi->ram[i].type = MT_RESERVED; |
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bi->nr_rams++; |
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} |
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/*
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* Load module.
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* Return 0 on success, -1 on failure.
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*/
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static int |
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load_module(struct ar_hdr *hdr, struct module *m) |
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{ |
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char *c;
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if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2)) { |
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DPRINTF(("Invalid image %s\n", hdr->ar_name));
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return -1; |
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} |
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strlcpy(m->name, hdr->ar_name, sizeof(m->name));
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c = m->name; |
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while (*c != '/' && *c != ' ') |
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c++; |
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*c = '\0';
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DPRINTF(("loading: hdr=%lx module=%lx name=%s\n",
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(paddr_t)hdr, (paddr_t)m, m->name)); |
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if (load_elf((char *)hdr + sizeof(struct ar_hdr), m)) |
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panic("Load error");
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return 0; |
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} |
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/*
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* Setup boot disk
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*/
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static void |
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setup_bootdisk(struct ar_hdr *hdr)
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{ |
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struct bootinfo *bi = bootinfo;
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paddr_t base; |
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size_t size; |
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/*
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* Store image information.
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*/
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if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2)) { |
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DPRINTF(("Invalid bootdisk image\n"));
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return;
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} |
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size = (size_t)atol((char *)&hdr->ar_size);
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size += size % 2; /* even alignment */ |
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if (size == 0) { |
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DPRINTF(("Size of bootdisk is zero\n"));
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return;
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} |
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base = (paddr_t)hdr + sizeof(struct ar_hdr); |
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bi->bootdisk.base = base; |
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bi->bootdisk.size = size; |
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#if !defined(CONFIG_ROMBOOT)
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/*
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* Reserve memory for boot disk if the image
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* was copied to RAM.
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*/
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bi->ram[bi->nr_rams].base = base; |
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bi->ram[bi->nr_rams].size = size; |
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bi->ram[bi->nr_rams].type = MT_BOOTDISK; |
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bi->nr_rams++; |
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#endif
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DPRINTF(("bootdisk base=%lx size=%lx\n",
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bi->bootdisk.base, bi->bootdisk.size)); |
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} |