Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
29static void *of_try_claim(unsigned long size)
30{
31 unsigned long addr = 0;
32
33 if (claim_base == 0)
34 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
35
36 for(; claim_base < RAM_END; claim_base += ONE_MB) {
37#ifdef DEBUG
38 printf(" trying: 0x%08lx\n\r", claim_base);
39#endif
40 addr = (unsigned long)of_claim(claim_base, size, 0);
41 if ((void *)addr != (void *)-1)
42 break;
43 }
44 if (addr == 0)
45 return NULL;
46 claim_base = PAGE_ALIGN(claim_base + size);
47 return (void *)addr;
48}
49
50static void of_image_hdr(const void *hdr)
51{
52 const Elf64_Ehdr *elf64 = hdr;
53
54 if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
55 /*
56 * Maintain a "magic" minimum address. This keeps some older
57 * firmware platforms running.
58 */
59 if (claim_base < PROG_START)
60 claim_base = PROG_START;
61 }
62}
63
64void platform_init(unsigned long a1, unsigned long a2, void *promptr)
65{
66 platform_ops.image_hdr = of_image_hdr;
67 platform_ops.malloc = of_try_claim;
68 platform_ops.exit = of_exit;
69 platform_ops.vmlinux_alloc = of_vmlinux_alloc;
70
71 dt_ops.finddevice = of_finddevice;
72 dt_ops.getprop = of_getprop;
73 dt_ops.setprop = of_setprop;
74
75 of_console_init();
76
77 of_init(promptr);
78 loader_info.promptr = promptr;
79 if (a1 && a2 && a2 != 0xdeadbeef) {
80 loader_info.initrd_addr = a1;
81 loader_info.initrd_size = a2;
82 }
83}