Subversion Repositories HelenOS-historic

/*

 * 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

typedef struct {

	memmap_t memmap;

	screen_t screen;

} bootinfo_t;

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\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(&bootinfo.memmap)) {

		printf("Error: Unable to get memory map\n");

		halt();

	}

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

		printf("Error: Unable to get screen properties\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(" kernel image         at %L (size %d bytes)\n", KERNEL_START, KERNEL_SIZE);

	printf(" boot info            at %L (physical %L)\n", &bootinfo, bootinfo_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(&bootinfo, &bootinfo_pa, "Boot info", &top);

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

	jump_to_kernel(bootinfo_pa, trans_pa, KERNEL_SIZE, real_mode_pa);

}