Linux Kernel  3.7.1
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of.c
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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 
27 static unsigned long claim_base;
28 
29 static 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 
50 static 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 
64 void 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;
70 
74 
76 
77  of_init(promptr);
78  loader_info.promptr = promptr;
79  if (a1 && a2 && a2 != 0xdeadbeef) {
82  }
83 }