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
of_init(void * promptr)21 void of_init(void *promptr)
22 {
23 prom = (int (*)(void *))promptr;
24 }
25
of_call_prom(const char * service,int nargs,int nret,...)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
of_call_prom_ret(const char * service,int nargs,int nret,unsigned int * rets,...)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 */
string_match(const char * s1,const char * s2)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
check_of_version(void)108 static int check_of_version(void)
109 {
110 phandle oprom, chosen;
111 char version[64];
112
113 oprom = of_finddevice("/openprom");
114 if (oprom == (phandle) -1)
115 return 0;
116 if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)
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;
123 chosen = of_finddevice("/chosen");
124 if (chosen == (phandle) -1) {
125 chosen = of_finddevice("/chosen@0");
126 if (chosen == (phandle) -1) {
127 printf("no chosen\n");
128 return 0;
129 }
130 }
131 if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
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
of_claim(unsigned long virt,unsigned long size,unsigned long align)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
of_vmlinux_alloc(unsigned long size)169 void *of_vmlinux_alloc(unsigned long size)
170 {
171 unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
172 void *addr;
173 void *p;
174
175 /* With some older POWER4 firmware we need to claim the area the kernel
176 * will reside in. Newer firmwares don't need this so we just ignore
177 * the return value.
178 */
179 addr = of_claim(start, end - start, 0);
180 printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %p\r\n",
181 start, end, end - start, addr);
182
183 p = malloc(size);
184 if (!p)
185 fatal("Can't allocate memory for kernel image!\n\r");
186
187 return p;
188 }
189
of_exit(void)190 void of_exit(void)
191 {
192 of_call_prom("exit", 0, 0);
193 }
194
195 /*
196 * OF device tree routines
197 */
of_finddevice(const char * name)198 void *of_finddevice(const char *name)
199 {
200 return (phandle) of_call_prom("finddevice", 1, 1, name);
201 }
202
of_getprop(const void * phandle,const char * name,void * buf,const int buflen)203 int of_getprop(const void *phandle, const char *name, void *buf,
204 const int buflen)
205 {
206 return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
207 }
208
of_setprop(const void * phandle,const char * name,const void * buf,const int buflen)209 int of_setprop(const void *phandle, const char *name, const void *buf,
210 const int buflen)
211 {
212 return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);
213 }
214