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 typedef u32 prom_arg_t;
21 /* The following structure is used to communicate with open firmware.
22 * All arguments in and out are in big endian format. */
24 __be32 service; /* Address of service name string. */
25 __be32 nargs; /* Number of input arguments. */
26 __be32 nret; /* Number of output arguments. */
27 __be32 args[10]; /* Input/output arguments. */
30 static int (*prom) (void *);
32 void of_init(void *promptr)
34 prom = (int (*)(void *))promptr;
37 #define ADDR(x) (u32)(unsigned long)(x)
39 int of_call_prom(const char *service, int nargs, int nret, ...)
42 struct prom_args args;
45 args.service = cpu_to_be32(ADDR(service));
46 args.nargs = cpu_to_be32(nargs);
47 args.nret = cpu_to_be32(nret);
50 for (i = 0; i < nargs; i++)
51 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
54 for (i = 0; i < nret; i++)
55 args.args[nargs+i] = 0;
60 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
63 static int of_call_prom_ret(const char *service, int nargs, int nret,
64 prom_arg_t *rets, ...)
67 struct prom_args args;
70 args.service = cpu_to_be32(ADDR(service));
71 args.nargs = cpu_to_be32(nargs);
72 args.nret = cpu_to_be32(nret);
75 for (i = 0; i < nargs; i++)
76 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
79 for (i = 0; i < nret; i++)
80 args.args[nargs+i] = 0;
86 for (i = 1; i < nret; ++i)
87 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
89 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
92 /* returns true if s2 is a prefix of s1 */
93 static int string_match(const char *s1, const char *s2)
102 * Older OF's require that when claiming a specific range of addresses,
103 * we claim the physical space in the /memory node and the virtual
104 * space in the chosen mmu node, and then do a map operation to
105 * map virtual to physical.
107 static int need_map = -1;
108 static ihandle chosen_mmu;
109 static phandle memory;
111 static int check_of_version(void)
113 phandle oprom, chosen;
116 oprom = of_finddevice("/openprom");
117 if (oprom == (phandle) -1)
119 if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)
121 version[sizeof(version)-1] = 0;
122 printf("OF version = '%s'\r\n", version);
123 if (!string_match(version, "Open Firmware, 1.")
124 && !string_match(version, "FirmWorks,3."))
126 chosen = of_finddevice("/chosen");
127 if (chosen == (phandle) -1) {
128 chosen = of_finddevice("/chosen@0");
129 if (chosen == (phandle) -1) {
130 printf("no chosen\n");
134 if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
138 memory = (ihandle) of_call_prom("open", 1, 1, "/memory");
139 if (memory == (ihandle) -1) {
140 memory = (ihandle) of_call_prom("open", 1, 1, "/memory@0");
141 if (memory == (ihandle) -1) {
142 printf("no memory node\n");
146 printf("old OF detected\r\n");
150 unsigned int of_claim(unsigned long virt, unsigned long size,
157 need_map = check_of_version();
158 if (align || !need_map)
159 return of_call_prom("claim", 3, 1, virt, size, align);
161 ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
163 if (ret != 0 || result == -1)
165 ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
167 /* 0x12 == coherent + read/write */
168 ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,
169 0x12, size, virt, virt);
173 void *of_vmlinux_alloc(unsigned long size)
175 unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
179 /* With some older POWER4 firmware we need to claim the area the kernel
180 * will reside in. Newer firmwares don't need this so we just ignore
183 addr = (unsigned long) of_claim(start, end - start, 0);
184 printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %lx\r\n",
185 start, end, end - start, addr);
189 fatal("Can't allocate memory for kernel image!\n\r");
196 of_call_prom("exit", 0, 0);
200 * OF device tree routines
202 void *of_finddevice(const char *name)
204 return (phandle) of_call_prom("finddevice", 1, 1, name);
207 int of_getprop(const void *phandle, const char *name, void *buf,
210 return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
213 int of_setprop(const void *phandle, const char *name, const void *buf,
216 return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);