/*
* 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"
#define KERNEL_START ((void *) &_binary_____________kernel_kernel_bin_start)
#define KERNEL_END ((void *) &_binary_____________kernel_kernel_bin_end)
#define KERNEL_SIZE ((unsigned int) KERNEL_END - (unsigned int) KERNEL_START)
#define HEAP_GAP 1024000
memmap_t memmap;
static void check_align(const void *addr, const char *desc)
{
if ((unsigned int) addr % PAGE_SIZE != 0) {
printf("Error: %s not on page boundary\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)\n", new_va
, new_pa
); halt();
}
if ((unsigned int) new_pa + PAGE_SIZE < KERNEL_SIZE) {
printf("Error: %s cannot be relocated\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");
check_align(KERNEL_START, "Kernel image");
check_align(&real_mode, "Bootstrap trampoline");
check_align(&trans, "Translation table");
if (!ofw_memmap(&memmap)) {
printf("Error: Unable to get memory map\n"); halt();
}
void *real_mode_pa = ofw_translate(&real_mode);
void *trans_pa = ofw_translate(&trans);
void *memmap_pa = ofw_translate(&memmap);
printf("Memory statistics (total %d MB)\n", memmap.
total >> 20); printf(" kernel image at %L (size %d bytes)\n", KERNEL_START
, KERNEL_SIZE
); printf(" memory map at %L (physical %L)\n", &memmap
, memmap_pa
); printf(" bootstrap trampoline at %L (physical %L)\n", &real_mode
, real_mode_pa
); printf(" translation table at %L (physical %L)\n", &trans
, trans_pa
);
unsigned int top = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE);
unsigned int addr;
for (addr = 0; addr < KERNEL_SIZE; addr += PAGE_SIZE) {
void *pa = ofw_translate(KERNEL_START + addr);
fix_overlap(KERNEL_START + addr, &pa, "Kernel image", &top);
trans[addr >> PAGE_WIDTH] = pa;
}
fix_overlap(&real_mode, &real_mode_pa, "Bootstrap trampoline", &top);
fix_overlap(&trans, &trans_pa, "Translation table", &top);
fix_overlap(&memmap, &memmap_pa, "Memory map", &top);
printf("Booting the kernel...\n"); jump_to_kernel(memmap_pa, trans_pa, KERNEL_SIZE, real_mode_pa);
}