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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/powerpc/boot/of.c
2 * Copyright (C) Paul Mackerras 1997.
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.
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
27 static unsigned long claim_base
;
29 void epapr_platform_init(unsigned long r3
, unsigned long r4
, unsigned long r5
,
30 unsigned long r6
, unsigned long r7
);
32 static void *of_try_claim(unsigned long size
)
34 unsigned long addr
= 0;
37 claim_base
= _ALIGN_UP((unsigned long)_end
, ONE_MB
);
39 for(; claim_base
< RAM_END
; claim_base
+= ONE_MB
) {
41 printf(" trying: 0x%08lx\n\r", claim_base
);
43 addr
= (unsigned long) of_claim(claim_base
, size
, 0);
44 if (addr
!= PROM_ERROR
)
49 claim_base
= PAGE_ALIGN(claim_base
+ size
);
53 static void of_image_hdr(const void *hdr
)
55 const Elf64_Ehdr
*elf64
= hdr
;
57 if (elf64
->e_ident
[EI_CLASS
] == ELFCLASS64
) {
59 * Maintain a "magic" minimum address. This keeps some older
60 * firmware platforms running.
62 if (claim_base
< PROG_START
)
63 claim_base
= PROG_START
;
67 static void of_platform_init(unsigned long a1
, unsigned long a2
, void *promptr
)
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
;
74 dt_ops
.finddevice
= of_finddevice
;
75 dt_ops
.getprop
= of_getprop
;
76 dt_ops
.setprop
= of_setprop
;
81 loader_info
.promptr
= promptr
;
82 if (a1
&& a2
&& a2
!= 0xdeadbeef) {
83 loader_info
.initrd_addr
= a1
;
84 loader_info
.initrd_size
= a2
;
88 void platform_init(unsigned long r3
, unsigned long r4
, unsigned long r5
,
89 unsigned long r6
, unsigned long r7
)
91 /* Detect OF vs. ePAPR boot */
93 of_platform_init(r3
, r4
, (void *)r5
);
95 epapr_platform_init(r3
, r4
, r5
, r6
, r7
);