source: mainline/boot/arch/ppc32/src/main.c

/*
 * Copyright (c) 2005 Martin Decky
 * 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.
 */

#include <arch/main.h>
#include <arch/arch.h>
#include <arch/asm.h>
#include <arch/types.h>
#include <genarch/ofw.h>
#include <genarch/ofw_tree.h>
#include <halt.h>
#include <printf.h>
#include <mem.h>
#include <version.h>
#include <macros.h>
#include <align.h>
#include <str.h>
#include <errno.h>
#include <payload.h>
#include <kernel.h>

#define BALLOC_MAX_SIZE  131072

static bootinfo_t bootinfo;

static void check_overlap(const char *dest, void *phys, size_t pages)
{
        if ((pages << PAGE_WIDTH) > (uintptr_t) phys) {
                printf("Error: Image (%u pages) overlaps %s at %p, halting.\n",
                    pages, dest, phys);
                halt();
        }
}

void bootstrap(void)
{
        version_print();
        ofw_memmap(&bootinfo.memmap);

        void *bootinfo_pa = ofw_translate(&bootinfo);
        void *real_mode_pa = ofw_translate(&real_mode);
        void *loader_address_pa = ofw_translate((void *) LOADER_ADDRESS);

        printf("\nMemory statistics (total %llu MB)\n", bootinfo.memmap.total >> 20);
        printf(" %p|%p: real mode trampoline\n", &real_mode, real_mode_pa);
        printf(" %p|%p: boot info structure\n", &bootinfo, bootinfo_pa);
        printf(" %p|%p: loader entry point\n",
            (void *) LOADER_ADDRESS, loader_address_pa);

        size_t unpacked_size = payload_unpacked_size();
        printf("Payload uncompressed size: %d bytes\n", unpacked_size);

        if (unpacked_size >= (size_t) loader_address_pa) {
                printf("Inflated components overlap loader area.\n");
                printf("The boot image is too large. Halting.\n");
                halt();
        }

        void *balloc_base;
        void *balloc_base_pa;
        ofw_alloc("boot allocator area", &balloc_base, &balloc_base_pa,
            BALLOC_MAX_SIZE, loader_address_pa);
        printf(" %p|%p: boot allocator area\n", balloc_base, balloc_base_pa);

        void *inflate_base;
        void *inflate_base_pa;
        ofw_alloc("inflate area", &inflate_base, &inflate_base_pa,
            unpacked_size, loader_address_pa);
        printf(" %p|%p: inflate area\n", inflate_base, inflate_base_pa);

        uintptr_t balloc_start = ALIGN_UP(unpacked_size, PAGE_SIZE);
        size_t pages = (balloc_start + ALIGN_UP(BALLOC_MAX_SIZE, PAGE_SIZE)) >>
            PAGE_WIDTH;

        printf(" Boot allocations area: %p - %p\n", (void *) balloc_start,
            (void *) (pages << PAGE_WIDTH));

        if ((pages << PAGE_WIDTH) >= (uintptr_t) loader_address_pa) {
                printf("Boot allocations overlap loader area.\n");
                printf("The boot image is too large. Halting.\n");
                halt();
        }

        void *transtable;
        void *transtable_pa;
        ofw_alloc("translate table", &transtable, &transtable_pa,
            pages * sizeof(void *), loader_address_pa);
        printf(" %p|%p: translate table\n", transtable, transtable_pa);

        check_overlap("boot allocator area", balloc_base_pa, pages);
        check_overlap("inflate area", inflate_base_pa, pages);
        check_overlap("translate table", transtable_pa, pages);

        /* Inflate components. */
        extract_payload(&bootinfo.taskmap, inflate_base,
            inflate_base + unpacked_size, PA2KA(0), NULL);

        printf("Setting up boot allocator ...\n");
        balloc_init(&bootinfo.ballocs, balloc_base, PA2KA(balloc_start),
            BALLOC_MAX_SIZE);

        printf("Setting up screens ...\n");
        ofw_setup_screens();

        printf("Canonizing OpenFirmware device tree ...\n");
        bootinfo.ofw_root = ofw_tree_build();

        printf("Setting up translate table ...\n");
        for (size_t i = 0; i < pages; i++) {
                uintptr_t off = i << PAGE_WIDTH;
                void *phys;

                if (off < balloc_start)
                        phys = ofw_translate(inflate_base + off);
                else
                        phys = ofw_translate(balloc_base + off - balloc_start);

                ((void **) transtable)[i] = phys;
        }

        uintptr_t entry = check_kernel_translated(inflate_base, 0);

        printf("Booting the kernel...\n");
        jump_to_kernel(bootinfo_pa, transtable_pa, pages, real_mode_pa, entry);
}