/*
* 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);
}