projects/linux·blob master · refs

93 lines · 2.1 KiB

1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) Paul Mackerras 1997.
4 */
5#include <stdarg.h>
6#include <stddef.h>
7#include "types.h"
8#include "elf.h"
9#include "string.h"
10#include "stdio.h"
11#include "page.h"
12#include "ops.h"
13
14#include "of.h"
15
16/* Value picked to match that used by yaboot */
17#define PROG_START 0x01400000 /* only used on 64-bit systems */
18#define RAM_END (512<<20) /* Fixme: use OF */
19#define ONE_MB 0x100000
20
21
22
23static unsigned long claim_base;
24
25void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
26 unsigned long r6, unsigned long r7);
27
28static void *of_try_claim(unsigned long size)
29{
30 unsigned long addr = 0;
31
32 if (claim_base == 0)
33 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
34
35 for(; claim_base < RAM_END; claim_base += ONE_MB) {
36#ifdef DEBUG
37 printf(" trying: 0x%08lx\n\r", claim_base);
38#endif
39 addr = (unsigned long) of_claim(claim_base, size, 0);
40 if (addr != PROM_ERROR)
41 break;
42 }
43 if (addr == 0)
44 return NULL;
45 claim_base = PAGE_ALIGN(claim_base + size);
46 return (void *)addr;
47}
48
49static void of_image_hdr(const void *hdr)
50{
51 const Elf64_Ehdr *elf64 = hdr;
52
53 if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
54 /*
55 * Maintain a "magic" minimum address. This keeps some older
56 * firmware platforms running.
57 */
58 if (claim_base < PROG_START)
59 claim_base = PROG_START;
60 }
61}
62
63static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
64{
65 platform_ops.image_hdr = of_image_hdr;
66 platform_ops.malloc = of_try_claim;
67 platform_ops.exit = of_exit;
68 platform_ops.vmlinux_alloc = of_vmlinux_alloc;
69
70 dt_ops.finddevice = of_finddevice;
71 dt_ops.getprop = of_getprop;
72 dt_ops.setprop = of_setprop;
73
74 of_console_init();
75
76 of_init(promptr);
77 loader_info.promptr = promptr;
78 if (a1 && a2 && a2 != 0xdeadbeef) {
79 loader_info.initrd_addr = a1;
80 loader_info.initrd_size = a2;
81 }
82}
83
84void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
85 unsigned long r6, unsigned long r7)
86{
87 /* Detect OF vs. ePAPR boot */
88 if (r5)
89 of_platform_init(r3, r4, (void *)r5);
90 else
91 epapr_platform_init(r3, r4, r5, r6, r7);
92}
93