[deliverable/linux.git] / arch / powerpc / boot / of.c

/*
 * Copyright (C) Paul Mackerras 1997.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "elf.h"
#include "string.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"

#include "of.h"

/* Value picked to match that used by yaboot */
#define PROG_START	0x01400000	/* only used on 64-bit systems */
#define RAM_END		(512<<20)	/* Fixme: use OF */
#define	ONE_MB		0x100000


static unsigned long claim_base;

void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
			 unsigned long r6, unsigned long r7);

static void *of_try_claim(unsigned long size)
{
	unsigned long addr = 0;

	if (claim_base == 0)
		claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);

	for(; claim_base < RAM_END; claim_base += ONE_MB) {
#ifdef DEBUG
		printf("    trying: 0x%08lx\n\r", claim_base);
#endif
		addr = (unsigned long) of_claim(claim_base, size, 0);
		if (addr != PROM_ERROR)
			break;
	}
	if (addr == 0)
		return NULL;
	claim_base = PAGE_ALIGN(claim_base + size);
	return (void *)addr;
}

static void of_image_hdr(const void *hdr)
{
	const Elf64_Ehdr *elf64 = hdr;

	if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
		/*
		 * Maintain a "magic" minimum address. This keeps some older
		 * firmware platforms running.
		 */
		if (claim_base < PROG_START)
			claim_base = PROG_START;
	}
}

static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
{
	platform_ops.image_hdr = of_image_hdr;
	platform_ops.malloc = of_try_claim;
	platform_ops.exit = of_exit;
	platform_ops.vmlinux_alloc = of_vmlinux_alloc;

	dt_ops.finddevice = of_finddevice;
	dt_ops.getprop = of_getprop;
	dt_ops.setprop = of_setprop;

	of_console_init();

	of_init(promptr);
	loader_info.promptr = promptr;
	if (a1 && a2 && a2 != 0xdeadbeef) {
		loader_info.initrd_addr = a1;
		loader_info.initrd_size = a2;
	}
}

void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
		   unsigned long r6, unsigned long r7)
{
	/* Detect OF vs. ePAPR boot */
	if (r5)
		of_platform_init(r3, r4, (void *)r5);
	else
		epapr_platform_init(r3, r4, r5, r6, r7);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) Paul Mackerras 1997.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*/
	9	#include <stdarg.h>
decd300b	10	#include <stddef.h>
b2c5f619 MG	11	#include "types.h"
b2c5f619 MG	12	#include "elf.h"
decd300b OH	13	#include "string.h"
decd300b OH	14	#include "stdio.h"
b2c5f619 MG	15	#include "page.h"
b2c5f619 MG	16	#include "ops.h"
7840e5e9	17
2e601613	18	#include "of.h"
1da177e4	19
b2c5f619 MG	20	/* Value picked to match that used by yaboot */
	21	#define PROG_START 0x01400000 /* only used on 64-bit systems */
	22	#define RAM_END (512<<20) /* Fixme: use OF */
	23	#define ONE_MB 0x100000
	24
b2c5f619 MG	25
	26
	27	static unsigned long claim_base;
	28
0c9fa291 BH	29	void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	30	unsigned long r6, unsigned long r7);
	31
4ca478e6	32	static void *of_try_claim(unsigned long size)
b2c5f619 MG	33	{
b2c5f619 MG	34	unsigned long addr = 0;
b2c5f619	35
c998de14	36	if (claim_base == 0)
b2c5f619	37	claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
b2c5f619 MG	38
	39	for(; claim_base < RAM_END; claim_base += ONE_MB) {
	40	#ifdef DEBUG
	41	printf(" trying: 0x%08lx\n\r", claim_base);
	42	#endif
034e55e6 CLG	43	addr = (unsigned long) of_claim(claim_base, size, 0);
034e55e6 CLG	44	if (addr != PROM_ERROR)
b2c5f619 MG	45	break;
	46	}
	47	if (addr == 0)
	48	return NULL;
	49	claim_base = PAGE_ALIGN(claim_base + size);
	50	return (void *)addr;
	51	}
	52
	53	static void of_image_hdr(const void *hdr)
	54	{
	55	const Elf64_Ehdr *elf64 = hdr;
	56
	57	if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
	58	/*
	59	* Maintain a "magic" minimum address. This keeps some older
	60	* firmware platforms running.
	61	*/
	62	if (claim_base < PROG_START)
	63	claim_base = PROG_START;
	64	}
	65	}
	66
0c9fa291	67	static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
b2c5f619	68	{
b2c5f619 MG	69	platform_ops.image_hdr = of_image_hdr;
b2c5f619 MG	70	platform_ops.malloc = of_try_claim;
b2c5f619	71	platform_ops.exit = of_exit;
79c85419	72	platform_ops.vmlinux_alloc = of_vmlinux_alloc;
b2c5f619 MG	73
	74	dt_ops.finddevice = of_finddevice;
	75	dt_ops.getprop = of_getprop;
	76	dt_ops.setprop = of_setprop;
b2c5f619	77
2e601613	78	of_console_init();
b2c5f619	79
2e601613	80	of_init(promptr);
cd197ffc	81	loader_info.promptr = promptr;
390cbb56 PM	82	if (a1 && a2 && a2 != 0xdeadbeef) {
	83	loader_info.initrd_addr = a1;
	84	loader_info.initrd_size = a2;
	85	}
b2c5f619	86	}
0c9fa291 BH	87
	88	void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	89	unsigned long r6, unsigned long r7)
	90	{
	91	/* Detect OF vs. ePAPR boot */
	92	if (r5)
	93	of_platform_init(r3, r4, (void *)r5);
	94	else
	95	epapr_platform_init(r3, r4, r5, r6, r7);
	96	}
	97