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2e601613 DG |
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 <stddef.h> | |
10 | #include "types.h" | |
11 | #include "elf.h" | |
12 | #include "string.h" | |
13 | #include "stdio.h" | |
14 | #include "page.h" | |
15 | #include "ops.h" | |
16 | ||
17 | #include "of.h" | |
18 | ||
19 | static int (*prom) (void *); | |
20 | ||
21 | void of_init(void *promptr) | |
22 | { | |
23 | prom = (int (*)(void *))promptr; | |
24 | } | |
25 | ||
26 | int of_call_prom(const char *service, int nargs, int nret, ...) | |
27 | { | |
28 | int i; | |
29 | struct prom_args { | |
30 | const char *service; | |
31 | int nargs; | |
32 | int nret; | |
33 | unsigned int args[12]; | |
34 | } args; | |
35 | va_list list; | |
36 | ||
37 | args.service = service; | |
38 | args.nargs = nargs; | |
39 | args.nret = nret; | |
40 | ||
41 | va_start(list, nret); | |
42 | for (i = 0; i < nargs; i++) | |
43 | args.args[i] = va_arg(list, unsigned int); | |
44 | va_end(list); | |
45 | ||
46 | for (i = 0; i < nret; i++) | |
47 | args.args[nargs+i] = 0; | |
48 | ||
49 | if (prom(&args) < 0) | |
50 | return -1; | |
51 | ||
52 | return (nret > 0)? args.args[nargs]: 0; | |
53 | } | |
54 | ||
55 | static int of_call_prom_ret(const char *service, int nargs, int nret, | |
56 | unsigned int *rets, ...) | |
57 | { | |
58 | int i; | |
59 | struct prom_args { | |
60 | const char *service; | |
61 | int nargs; | |
62 | int nret; | |
63 | unsigned int args[12]; | |
64 | } args; | |
65 | va_list list; | |
66 | ||
67 | args.service = service; | |
68 | args.nargs = nargs; | |
69 | args.nret = nret; | |
70 | ||
71 | va_start(list, rets); | |
72 | for (i = 0; i < nargs; i++) | |
73 | args.args[i] = va_arg(list, unsigned int); | |
74 | va_end(list); | |
75 | ||
76 | for (i = 0; i < nret; i++) | |
77 | args.args[nargs+i] = 0; | |
78 | ||
79 | if (prom(&args) < 0) | |
80 | return -1; | |
81 | ||
82 | if (rets != (void *) 0) | |
83 | for (i = 1; i < nret; ++i) | |
84 | rets[i-1] = args.args[nargs+i]; | |
85 | ||
86 | return (nret > 0)? args.args[nargs]: 0; | |
87 | } | |
88 | ||
89 | /* returns true if s2 is a prefix of s1 */ | |
90 | static int string_match(const char *s1, const char *s2) | |
91 | { | |
92 | for (; *s2; ++s2) | |
93 | if (*s1++ != *s2) | |
94 | return 0; | |
95 | return 1; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Older OF's require that when claiming a specific range of addresses, | |
100 | * we claim the physical space in the /memory node and the virtual | |
101 | * space in the chosen mmu node, and then do a map operation to | |
102 | * map virtual to physical. | |
103 | */ | |
104 | static int need_map = -1; | |
105 | static ihandle chosen_mmu; | |
106 | static phandle memory; | |
107 | ||
108 | static int check_of_version(void) | |
109 | { | |
110 | phandle oprom, chosen; | |
111 | char version[64]; | |
112 | ||
08464712 | 113 | oprom = of_finddevice("/openprom"); |
2e601613 DG |
114 | if (oprom == (phandle) -1) |
115 | return 0; | |
08464712 | 116 | if (of_getprop(oprom, "model", version, sizeof(version)) <= 0) |
2e601613 DG |
117 | return 0; |
118 | version[sizeof(version)-1] = 0; | |
119 | printf("OF version = '%s'\r\n", version); | |
120 | if (!string_match(version, "Open Firmware, 1.") | |
121 | && !string_match(version, "FirmWorks,3.")) | |
122 | return 0; | |
08464712 | 123 | chosen = of_finddevice("/chosen"); |
2e601613 | 124 | if (chosen == (phandle) -1) { |
08464712 | 125 | chosen = of_finddevice("/chosen@0"); |
2e601613 DG |
126 | if (chosen == (phandle) -1) { |
127 | printf("no chosen\n"); | |
128 | return 0; | |
129 | } | |
130 | } | |
08464712 | 131 | if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) { |
2e601613 DG |
132 | printf("no mmu\n"); |
133 | return 0; | |
134 | } | |
135 | memory = (ihandle) of_call_prom("open", 1, 1, "/memory"); | |
136 | if (memory == (ihandle) -1) { | |
137 | memory = (ihandle) of_call_prom("open", 1, 1, "/memory@0"); | |
138 | if (memory == (ihandle) -1) { | |
139 | printf("no memory node\n"); | |
140 | return 0; | |
141 | } | |
142 | } | |
143 | printf("old OF detected\r\n"); | |
144 | return 1; | |
145 | } | |
146 | ||
147 | void *of_claim(unsigned long virt, unsigned long size, unsigned long align) | |
148 | { | |
149 | int ret; | |
150 | unsigned int result; | |
151 | ||
152 | if (need_map < 0) | |
153 | need_map = check_of_version(); | |
154 | if (align || !need_map) | |
155 | return (void *) of_call_prom("claim", 3, 1, virt, size, align); | |
156 | ||
157 | ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory, | |
158 | align, size, virt); | |
159 | if (ret != 0 || result == -1) | |
160 | return (void *) -1; | |
161 | ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu, | |
162 | align, size, virt); | |
163 | /* 0x12 == coherent + read/write */ | |
164 | ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu, | |
165 | 0x12, size, virt, virt); | |
166 | return (void *) virt; | |
167 | } | |
168 | ||
08464712 DG |
169 | void *of_vmlinux_alloc(unsigned long size) |
170 | { | |
171 | void *p = malloc(size); | |
172 | ||
173 | if (!p) | |
174 | fatal("Can't allocate memory for kernel image!\n\r"); | |
175 | ||
176 | return p; | |
177 | } | |
178 | ||
2e601613 DG |
179 | void of_exit(void) |
180 | { | |
181 | of_call_prom("exit", 0, 0); | |
182 | } | |
08464712 DG |
183 | |
184 | /* | |
185 | * OF device tree routines | |
186 | */ | |
187 | void *of_finddevice(const char *name) | |
188 | { | |
189 | return (phandle) of_call_prom("finddevice", 1, 1, name); | |
190 | } | |
191 | ||
192 | int of_getprop(const void *phandle, const char *name, void *buf, | |
193 | const int buflen) | |
194 | { | |
195 | return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen); | |
196 | } | |
197 | ||
198 | int of_setprop(const void *phandle, const char *name, const void *buf, | |
199 | const int buflen) | |
200 | { | |
201 | return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen); | |
202 | } |