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 
of_try_claim(unsigned long size)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 
of_image_hdr(const void * hdr)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 
platform_init(unsigned long a1,unsigned long a2,void * promptr)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;
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 }
84