Subversion Repositories HelenOS

/*

 * 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 "main.h" 

#include "printf.h"

#include "asm.h"

#include "_components.h"

#define HEAP_GAP 1024000

bootinfo_t bootinfo;

static void check_align(const void *addr, const char *desc)

{

    if ((unsigned int) addr % PAGE_SIZE != 0) {

        printf("Error: %s not on page boundary, halting.\n", desc);

        halt();

    }

}

static void fix_overlap(void *va, void **pa, const char *desc, unsigned int *top)

{

    if ((unsigned int) *pa + PAGE_SIZE < *top) {

        printf("Warning: %s overlaps kernel physical area\n", desc);

        void *new_va = (void *) (ALIGN_UP((unsigned int) KERNEL_END + HEAP_GAP, PAGE_SIZE) + *top);

        void *new_pa = (void *) (HEAP_GAP + *top);

        *top += PAGE_SIZE;

        if (ofw_map(new_pa, new_va, PAGE_SIZE, 0) != 0) {

            printf("Error: Unable to map page aligned memory at %L (physical %L), halting.\n", new_va, new_pa);

            halt();

        }

        if ((unsigned int) new_pa + PAGE_SIZE < KERNEL_SIZE) {

            printf("Error: %s cannot be relocated, halting.\n", desc);

            halt();

        }

        printf("Relocating %L -> %L (physical %L -> %L)\n", va, new_va, *pa, new_pa);

        *pa = new_pa;

        memcpy(new_va, va, PAGE_SIZE);

    }

}

void bootstrap(void)

{

    printf("\nHelenOS PPC Bootloader\n");

    init_components();

    unsigned int i;

    for (i = 0; i < COMPONENTS; i++)

        check_align(components[i].start, components[i].name);

    check_align(&real_mode, "bootstrap trampoline");

    check_align(&trans, "translation table");

    if (!ofw_memmap(&bootinfo.memmap)) {

        printf("Error: unable to get memory map, halting.\n");

        halt();

    }

    if (bootinfo.memmap.total == 0) {

        printf("Error: no memory detected, halting.\n");

        halt();

    }

    if (!ofw_screen(&bootinfo.screen)) {

        printf("Error: unable to get screen properties, halting.\n");

        halt();

    }

    printf("\nDevice statistics\n");

    printf(" screen at %L, resolution %dx%d, %d bpp (scanline %d bytes)\n", bootinfo.screen.addr, bootinfo.screen.width, bootinfo.screen.height, bootinfo.screen.bpp, bootinfo.screen.scanline);

    void *real_mode_pa = ofw_translate(&real_mode);

    void *trans_pa = ofw_translate(&trans);

    void *bootinfo_pa = ofw_translate(&bootinfo);

    void *fb = (void *) (((unsigned int) bootinfo.screen.addr) & ((unsigned int) ~0 << 17));

    printf("\nMemory statistics (total %d MB)\n", bootinfo.memmap.total >> 20);

    printf(" %L: boot info structure (physical %L)\n", &bootinfo, bootinfo_pa);

    printf(" %L: bootstrap trampoline (physical %L)\n", &real_mode, real_mode_pa);

    printf(" %L: translation table (physical %L)\n", &trans, trans_pa);

    for (i = 0; i < COMPONENTS; i++)

        printf(" %L: %s image (size %d bytes)\n", components[i].start, components[i].name, components[i].size);

    unsigned int top = 0;

    for (i = 0; i < COMPONENTS; i++)

        top += ALIGN_UP(components[i].size, PAGE_SIZE);

    unsigned int pages = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE) >> PAGE_WIDTH;

    for (i = 0; i < pages; i++) {

        void *pa = ofw_translate(KERNEL_START + (i << PAGE_WIDTH));

        fix_overlap(KERNEL_START + (i << PAGE_WIDTH), &pa, "kernel", &top);

        trans[i] = pa;

    }

    bootinfo.taskmap.count = 0;

    for (i = 1; i < COMPONENTS; i++) {

        unsigned int component_pages = ALIGN_UP(components[i].size, PAGE_SIZE) >> PAGE_WIDTH;

        unsigned int j;

        for (j = 0; j < component_pages; j++) {

            void *pa = ofw_translate(components[i].start + (j << PAGE_WIDTH));

            fix_overlap(components[i].start + (j << PAGE_WIDTH), &pa, components[i].name, &top);

            trans[pages + j] = pa;

            if (j == 0) {

                bootinfo.taskmap.tasks[bootinfo.taskmap.count].addr = (void *) (pages << PAGE_WIDTH);

                bootinfo.taskmap.tasks[bootinfo.taskmap.count].size = components[i].size;

                bootinfo.taskmap.count++;

            }

        }

        pages += component_pages;

    }

    fix_overlap(&real_mode, &real_mode_pa, "bootstrap trampoline", &top);

    fix_overlap(&trans, &trans_pa, "translation table", &top);

    fix_overlap(&bootinfo, &bootinfo_pa, "boot info", &top);

    printf("\nBooting the kernel...\n");

    jump_to_kernel(bootinfo_pa, sizeof(bootinfo), trans_pa, pages << PAGE_WIDTH, fb, real_mode_pa);

}