tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * misc.c: Miscellaneous prom functions that don't belong
3 * anywhere else.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/interrupt.h>
13#include <linux/delay.h>
14#include <linux/module.h>
15
16#include <asm/openprom.h>
17#include <asm/oplib.h>
18#include <asm/ldc.h>
19
20static int prom_service_exists(const char *service_name)
21{
22 unsigned long args[5];
23
24 args[0] = (unsigned long) "test";
25 args[1] = 1;
26 args[2] = 1;
27 args[3] = (unsigned long) service_name;
28 args[4] = (unsigned long) -1;
29
30 p1275_cmd_direct(args);
31
32 if (args[4])
33 return 0;
34 return 1;
35}
36
37void prom_sun4v_guest_soft_state(void)
38{
39 const char *svc = "SUNW,soft-state-supported";
40 unsigned long args[3];
41
42 if (!prom_service_exists(svc))
43 return;
44 args[0] = (unsigned long) svc;
45 args[1] = 0;
46 args[2] = 0;
47 p1275_cmd_direct(args);
48}
49
50/* Reset and reboot the machine with the command 'bcommand'. */
51void prom_reboot(const char *bcommand)
52{
53 unsigned long args[4];
54
55#ifdef CONFIG_SUN_LDOMS
56 if (ldom_domaining_enabled)
57 ldom_reboot(bcommand);
58#endif
59 args[0] = (unsigned long) "boot";
60 args[1] = 1;
61 args[2] = 0;
62 args[3] = (unsigned long) bcommand;
63
64 p1275_cmd_direct(args);
65}
66
67/* Forth evaluate the expression contained in 'fstring'. */
68void prom_feval(const char *fstring)
69{
70 unsigned long args[5];
71
72 if (!fstring || fstring[0] == 0)
73 return;
74 args[0] = (unsigned long) "interpret";
75 args[1] = 1;
76 args[2] = 1;
77 args[3] = (unsigned long) fstring;
78 args[4] = (unsigned long) -1;
79
80 p1275_cmd_direct(args);
81}
82EXPORT_SYMBOL(prom_feval);
83
84#ifdef CONFIG_SMP
85extern void smp_capture(void);
86extern void smp_release(void);
87#endif
88
89/* Drop into the prom, with the chance to continue with the 'go'
90 * prom command.
91 */
92void prom_cmdline(void)
93{
94 unsigned long args[3];
95 unsigned long flags;
96
97 local_irq_save(flags);
98
99#ifdef CONFIG_SMP
100 smp_capture();
101#endif
102
103 args[0] = (unsigned long) "enter";
104 args[1] = 0;
105 args[2] = 0;
106
107 p1275_cmd_direct(args);
108
109#ifdef CONFIG_SMP
110 smp_release();
111#endif
112
113 local_irq_restore(flags);
114}
115
116/* Drop into the prom, but completely terminate the program.
117 * No chance of continuing.
118 */
119void notrace prom_halt(void)
120{
121 unsigned long args[3];
122
123#ifdef CONFIG_SUN_LDOMS
124 if (ldom_domaining_enabled)
125 ldom_power_off();
126#endif
127again:
128 args[0] = (unsigned long) "exit";
129 args[1] = 0;
130 args[2] = 0;
131 p1275_cmd_direct(args);
132 goto again; /* PROM is out to get me -DaveM */
133}
134
135void prom_halt_power_off(void)
136{
137 unsigned long args[3];
138
139#ifdef CONFIG_SUN_LDOMS
140 if (ldom_domaining_enabled)
141 ldom_power_off();
142#endif
143 args[0] = (unsigned long) "SUNW,power-off";
144 args[1] = 0;
145 args[2] = 0;
146 p1275_cmd_direct(args);
147
148 /* if nothing else helps, we just halt */
149 prom_halt();
150}
151
152/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
153 * format type. 'num_bytes' is the number of bytes that your idbuf
154 * has space for. Returns 0xff on error.
155 */
156unsigned char prom_get_idprom(char *idbuf, int num_bytes)
157{
158 int len;
159
160 len = prom_getproplen(prom_root_node, "idprom");
161 if ((len >num_bytes) || (len == -1))
162 return 0xff;
163 if (!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
164 return idbuf[0];
165
166 return 0xff;
167}
168
169int prom_get_mmu_ihandle(void)
170{
171 phandle node;
172 int ret;
173
174 if (prom_mmu_ihandle_cache != 0)
175 return prom_mmu_ihandle_cache;
176
177 node = prom_finddevice(prom_chosen_path);
178 ret = prom_getint(node, prom_mmu_name);
179 if (ret == -1 || ret == 0)
180 prom_mmu_ihandle_cache = -1;
181 else
182 prom_mmu_ihandle_cache = ret;
183
184 return ret;
185}
186
187static int prom_get_memory_ihandle(void)
188{
189 static int memory_ihandle_cache;
190 phandle node;
191 int ret;
192
193 if (memory_ihandle_cache != 0)
194 return memory_ihandle_cache;
195
196 node = prom_finddevice("/chosen");
197 ret = prom_getint(node, "memory");
198 if (ret == -1 || ret == 0)
199 memory_ihandle_cache = -1;
200 else
201 memory_ihandle_cache = ret;
202
203 return ret;
204}
205
206/* Load explicit I/D TLB entries. */
207static long tlb_load(const char *type, unsigned long index,
208 unsigned long tte_data, unsigned long vaddr)
209{
210 unsigned long args[9];
211
212 args[0] = (unsigned long) prom_callmethod_name;
213 args[1] = 5;
214 args[2] = 1;
215 args[3] = (unsigned long) type;
216 args[4] = (unsigned int) prom_get_mmu_ihandle();
217 args[5] = vaddr;
218 args[6] = tte_data;
219 args[7] = index;
220 args[8] = (unsigned long) -1;
221
222 p1275_cmd_direct(args);
223
224 return (long) args[8];
225}
226
227long prom_itlb_load(unsigned long index,
228 unsigned long tte_data,
229 unsigned long vaddr)
230{
231 return tlb_load("SUNW,itlb-load", index, tte_data, vaddr);
232}
233
234long prom_dtlb_load(unsigned long index,
235 unsigned long tte_data,
236 unsigned long vaddr)
237{
238 return tlb_load("SUNW,dtlb-load", index, tte_data, vaddr);
239}
240
241int prom_map(int mode, unsigned long size,
242 unsigned long vaddr, unsigned long paddr)
243{
244 unsigned long args[11];
245 int ret;
246
247 args[0] = (unsigned long) prom_callmethod_name;
248 args[1] = 7;
249 args[2] = 1;
250 args[3] = (unsigned long) prom_map_name;
251 args[4] = (unsigned int) prom_get_mmu_ihandle();
252 args[5] = (unsigned int) mode;
253 args[6] = size;
254 args[7] = vaddr;
255 args[8] = 0;
256 args[9] = paddr;
257 args[10] = (unsigned long) -1;
258
259 p1275_cmd_direct(args);
260
261 ret = (int) args[10];
262 if (ret == 0)
263 ret = -1;
264 return ret;
265}
266
267void prom_unmap(unsigned long size, unsigned long vaddr)
268{
269 unsigned long args[7];
270
271 args[0] = (unsigned long) prom_callmethod_name;
272 args[1] = 4;
273 args[2] = 0;
274 args[3] = (unsigned long) prom_unmap_name;
275 args[4] = (unsigned int) prom_get_mmu_ihandle();
276 args[5] = size;
277 args[6] = vaddr;
278
279 p1275_cmd_direct(args);
280}
281
282/* Set aside physical memory which is not touched or modified
283 * across soft resets.
284 */
285int prom_retain(const char *name, unsigned long size,
286 unsigned long align, unsigned long *paddr)
287{
288 unsigned long args[11];
289
290 args[0] = (unsigned long) prom_callmethod_name;
291 args[1] = 5;
292 args[2] = 3;
293 args[3] = (unsigned long) "SUNW,retain";
294 args[4] = (unsigned int) prom_get_memory_ihandle();
295 args[5] = align;
296 args[6] = size;
297 args[7] = (unsigned long) name;
298 args[8] = (unsigned long) -1;
299 args[9] = (unsigned long) -1;
300 args[10] = (unsigned long) -1;
301
302 p1275_cmd_direct(args);
303
304 if (args[8])
305 return (int) args[8];
306
307 /* Next we get "phys_high" then "phys_low". On 64-bit
308 * the phys_high cell is don't care since the phys_low
309 * cell has the full value.
310 */
311 *paddr = args[10];
312
313 return 0;
314}
315
316/* Get "Unumber" string for the SIMM at the given
317 * memory address. Usually this will be of the form
318 * "Uxxxx" where xxxx is a decimal number which is
319 * etched into the motherboard next to the SIMM slot
320 * in question.
321 */
322int prom_getunumber(int syndrome_code,
323 unsigned long phys_addr,
324 char *buf, int buflen)
325{
326 unsigned long args[12];
327
328 args[0] = (unsigned long) prom_callmethod_name;
329 args[1] = 7;
330 args[2] = 2;
331 args[3] = (unsigned long) "SUNW,get-unumber";
332 args[4] = (unsigned int) prom_get_memory_ihandle();
333 args[5] = buflen;
334 args[6] = (unsigned long) buf;
335 args[7] = 0;
336 args[8] = phys_addr;
337 args[9] = (unsigned int) syndrome_code;
338 args[10] = (unsigned long) -1;
339 args[11] = (unsigned long) -1;
340
341 p1275_cmd_direct(args);
342
343 return (int) args[10];
344}
345
346/* Power management extensions. */
347void prom_sleepself(void)
348{
349 unsigned long args[3];
350
351 args[0] = (unsigned long) "SUNW,sleep-self";
352 args[1] = 0;
353 args[2] = 0;
354 p1275_cmd_direct(args);
355}
356
357int prom_sleepsystem(void)
358{
359 unsigned long args[4];
360
361 args[0] = (unsigned long) "SUNW,sleep-system";
362 args[1] = 0;
363 args[2] = 1;
364 args[3] = (unsigned long) -1;
365 p1275_cmd_direct(args);
366
367 return (int) args[3];
368}
369
370int prom_wakeupsystem(void)
371{
372 unsigned long args[4];
373
374 args[0] = (unsigned long) "SUNW,wakeup-system";
375 args[1] = 0;
376 args[2] = 1;
377 args[3] = (unsigned long) -1;
378 p1275_cmd_direct(args);
379
380 return (int) args[3];
381}
382
383#ifdef CONFIG_SMP
384void prom_startcpu(int cpunode, unsigned long pc, unsigned long arg)
385{
386 unsigned long args[6];
387
388 args[0] = (unsigned long) "SUNW,start-cpu";
389 args[1] = 3;
390 args[2] = 0;
391 args[3] = (unsigned int) cpunode;
392 args[4] = pc;
393 args[5] = arg;
394 p1275_cmd_direct(args);
395}
396
397void prom_startcpu_cpuid(int cpuid, unsigned long pc, unsigned long arg)
398{
399 unsigned long args[6];
400
401 args[0] = (unsigned long) "SUNW,start-cpu-by-cpuid";
402 args[1] = 3;
403 args[2] = 0;
404 args[3] = (unsigned int) cpuid;
405 args[4] = pc;
406 args[5] = arg;
407 p1275_cmd_direct(args);
408}
409
410void prom_stopcpu_cpuid(int cpuid)
411{
412 unsigned long args[4];
413
414 args[0] = (unsigned long) "SUNW,stop-cpu-by-cpuid";
415 args[1] = 1;
416 args[2] = 0;
417 args[3] = (unsigned int) cpuid;
418 p1275_cmd_direct(args);
419}
420
421void prom_stopself(void)
422{
423 unsigned long args[3];
424
425 args[0] = (unsigned long) "SUNW,stop-self";
426 args[1] = 0;
427 args[2] = 0;
428 p1275_cmd_direct(args);
429}
430
431void prom_idleself(void)
432{
433 unsigned long args[3];
434
435 args[0] = (unsigned long) "SUNW,idle-self";
436 args[1] = 0;
437 args[2] = 0;
438 p1275_cmd_direct(args);
439}
440
441void prom_resumecpu(int cpunode)
442{
443 unsigned long args[4];
444
445 args[0] = (unsigned long) "SUNW,resume-cpu";
446 args[1] = 1;
447 args[2] = 0;
448 args[3] = (unsigned int) cpunode;
449 p1275_cmd_direct(args);
450}
451#endif