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>
10#include <stddef.h>
11#include "types.h"
12#include "elf.h"
13#include "string.h"
14#include "stdio.h"
15#include "page.h"
16#include "ops.h"
17
18#include "of.h"
19
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
25
26
27static unsigned long claim_base;
28
29void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
30			 unsigned long r6, unsigned long r7);
31
32static void *of_try_claim(unsigned long size)
33{
34	unsigned long addr = 0;
35
36	if (claim_base == 0)
37		claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
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
43		addr = (unsigned long) of_claim(claim_base, size, 0);
44		if (addr != PROM_ERROR)
45			break;
46	}
47	if (addr == 0)
48		return NULL;
49	claim_base = PAGE_ALIGN(claim_base + size);
50	return (void *)addr;
51}
52
53static 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
67static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
68{
69	platform_ops.image_hdr = of_image_hdr;
70	platform_ops.malloc = of_try_claim;
71	platform_ops.exit = of_exit;
72	platform_ops.vmlinux_alloc = of_vmlinux_alloc;
73
74	dt_ops.finddevice = of_finddevice;
75	dt_ops.getprop = of_getprop;
76	dt_ops.setprop = of_setprop;
77
78	of_console_init();
79
80	of_init(promptr);
81	loader_info.promptr = promptr;
82	if (a1 && a2 && a2 != 0xdeadbeef) {
83		loader_info.initrd_addr = a1;
84		loader_info.initrd_size = a2;
85	}
86}
87
88void 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
98