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/*
 * 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);
   
    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, real_mode_pa, bootinfo.screen.addr, bootinfo.screen.scanline);
}