treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[muen/linux.git] / arch / powerpc / boot / of.c
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
23 static unsigned long claim_base;
24
25 void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
26                          unsigned long r6, unsigned long r7);
27
28 static 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
49 static 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
63 static 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
84 void 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