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Linux/arch/powerpc/boot/oflib.c

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  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 typedef u32 prom_arg_t;
 20 
 21 /* The following structure is used to communicate with open firmware.
 22  * All arguments in and out are in big endian format. */
 23 struct prom_args {
 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. */
 28 };
 29 
 30 #ifdef __powerpc64__
 31 extern int prom(void *);
 32 #else
 33 static int (*prom) (void *);
 34 #endif
 35 
 36 void of_init(void *promptr)
 37 {
 38 #ifndef __powerpc64__
 39         prom = (int (*)(void *))promptr;
 40 #endif
 41 }
 42 
 43 #define ADDR(x)         (u32)(unsigned long)(x)
 44 
 45 int of_call_prom(const char *service, int nargs, int nret, ...)
 46 {
 47         int i;
 48         struct prom_args args;
 49         va_list list;
 50 
 51         args.service = cpu_to_be32(ADDR(service));
 52         args.nargs = cpu_to_be32(nargs);
 53         args.nret = cpu_to_be32(nret);
 54 
 55         va_start(list, nret);
 56         for (i = 0; i < nargs; i++)
 57                 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
 58         va_end(list);
 59 
 60         for (i = 0; i < nret; i++)
 61                 args.args[nargs+i] = 0;
 62 
 63         if (prom(&args) < 0)
 64                 return PROM_ERROR;
 65 
 66         return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
 67 }
 68 
 69 static int of_call_prom_ret(const char *service, int nargs, int nret,
 70                             prom_arg_t *rets, ...)
 71 {
 72         int i;
 73         struct prom_args args;
 74         va_list list;
 75 
 76         args.service = cpu_to_be32(ADDR(service));
 77         args.nargs = cpu_to_be32(nargs);
 78         args.nret = cpu_to_be32(nret);
 79 
 80         va_start(list, rets);
 81         for (i = 0; i < nargs; i++)
 82                 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
 83         va_end(list);
 84 
 85         for (i = 0; i < nret; i++)
 86                 args.args[nargs+i] = 0;
 87 
 88         if (prom(&args) < 0)
 89                 return PROM_ERROR;
 90 
 91         if (rets != NULL)
 92                 for (i = 1; i < nret; ++i)
 93                         rets[i-1] = be32_to_cpu(args.args[nargs+i]);
 94 
 95         return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
 96 }
 97 
 98 /* returns true if s2 is a prefix of s1 */
 99 static int string_match(const char *s1, const char *s2)
100 {
101         for (; *s2; ++s2)
102                 if (*s1++ != *s2)
103                         return 0;
104         return 1;
105 }
106 
107 /*
108  * Older OF's require that when claiming a specific range of addresses,
109  * we claim the physical space in the /memory node and the virtual
110  * space in the chosen mmu node, and then do a map operation to
111  * map virtual to physical.
112  */
113 static int need_map = -1;
114 static ihandle chosen_mmu;
115 static ihandle memory;
116 
117 static int check_of_version(void)
118 {
119         phandle oprom, chosen;
120         char version[64];
121 
122         oprom = of_finddevice("/openprom");
123         if (oprom == (phandle) -1)
124                 return 0;
125         if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)
126                 return 0;
127         version[sizeof(version)-1] = 0;
128         printf("OF version = '%s'\r\n", version);
129         if (!string_match(version, "Open Firmware, 1.")
130             && !string_match(version, "FirmWorks,3."))
131                 return 0;
132         chosen = of_finddevice("/chosen");
133         if (chosen == (phandle) -1) {
134                 chosen = of_finddevice("/chosen@0");
135                 if (chosen == (phandle) -1) {
136                         printf("no chosen\n");
137                         return 0;
138                 }
139         }
140         if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
141                 printf("no mmu\n");
142                 return 0;
143         }
144         memory = of_call_prom("open", 1, 1, "/memory");
145         if (memory == PROM_ERROR) {
146                 memory = of_call_prom("open", 1, 1, "/memory@0");
147                 if (memory == PROM_ERROR) {
148                         printf("no memory node\n");
149                         return 0;
150                 }
151         }
152         printf("old OF detected\r\n");
153         return 1;
154 }
155 
156 unsigned int of_claim(unsigned long virt, unsigned long size,
157                       unsigned long align)
158 {
159         int ret;
160         prom_arg_t result;
161 
162         if (need_map < 0)
163                 need_map = check_of_version();
164         if (align || !need_map)
165                 return of_call_prom("claim", 3, 1, virt, size, align);
166 
167         ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
168                                align, size, virt);
169         if (ret != 0 || result == -1)
170                 return  -1;
171         ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
172                                align, size, virt);
173         /* 0x12 == coherent + read/write */
174         ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,
175                            0x12, size, virt, virt);
176         return virt;
177 }
178 
179 void *of_vmlinux_alloc(unsigned long size)
180 {
181         unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
182         unsigned long addr;
183         void *p;
184 
185         /* With some older POWER4 firmware we need to claim the area the kernel
186          * will reside in.  Newer firmwares don't need this so we just ignore
187          * the return value.
188          */
189         addr = (unsigned long) of_claim(start, end - start, 0);
190         printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %lx\r\n",
191                start, end, end - start, addr);
192 
193         p = malloc(size);
194         if (!p)
195                 fatal("Can't allocate memory for kernel image!\n\r");
196 
197         return p;
198 }
199 
200 void of_exit(void)
201 {
202         of_call_prom("exit", 0, 0);
203 }
204 
205 /*
206  * OF device tree routines
207  */
208 void *of_finddevice(const char *name)
209 {
210         return (void *) (unsigned long) of_call_prom("finddevice", 1, 1, name);
211 }
212 
213 int of_getprop(const void *phandle, const char *name, void *buf,
214                const int buflen)
215 {
216         return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
217 }
218 
219 int of_setprop(const void *phandle, const char *name, const void *buf,
220                const int buflen)
221 {
222         return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);
223 }
224 

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