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.
19 static int (*prom) (void *);
21 void of_init(void *promptr)
23 prom = (int (*)(void *))promptr;
26 int of_call_prom(const char *service, int nargs, int nret, ...)
33 unsigned int args[12];
37 args.service = service;
42 for (i = 0; i < nargs; i++)
43 args.args[i] = va_arg(list, unsigned int);
46 for (i = 0; i < nret; i++)
47 args.args[nargs+i] = 0;
52 return (nret > 0)? args.args[nargs]: 0;
55 static int of_call_prom_ret(const char *service, int nargs, int nret,
56 unsigned int *rets, ...)
63 unsigned int args[12];
67 args.service = service;
72 for (i = 0; i < nargs; i++)
73 args.args[i] = va_arg(list, unsigned int);
76 for (i = 0; i < nret; i++)
77 args.args[nargs+i] = 0;
82 if (rets != (void *) 0)
83 for (i = 1; i < nret; ++i)
84 rets[i-1] = args.args[nargs+i];
86 return (nret > 0)? args.args[nargs]: 0;
89 /* returns true if s2 is a prefix of s1 */
90 static int string_match(const char *s1, const char *s2)
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.
104 static int need_map = -1;
105 static ihandle chosen_mmu;
106 static phandle memory;
108 static int check_of_version(void)
110 phandle oprom, chosen;
113 oprom = of_finddevice("/openprom");
114 if (oprom == (phandle) -1)
116 if (of_getprop(oprom, "model", version, sizeof(version)) <= 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."))
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");
131 if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
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");
143 printf("old OF detected\r\n");
147 void *of_claim(unsigned long virt, unsigned long size, unsigned long align)
153 need_map = check_of_version();
154 if (align || !need_map)
155 return (void *) of_call_prom("claim", 3, 1, virt, size, align);
157 ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
159 if (ret != 0 || result == -1)
161 ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
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;
169 void *of_vmlinux_alloc(unsigned long size)
171 unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
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
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);
185 fatal("Can't allocate memory for kernel image!\n\r");
192 of_call_prom("exit", 0, 0);
196 * OF device tree routines
198 void *of_finddevice(const char *name)
200 return (phandle) of_call_prom("finddevice", 1, 1, name);
203 int of_getprop(const void *phandle, const char *name, void *buf,
206 return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
209 int of_setprop(const void *phandle, const char *name, const void *buf,
212 return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);