1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include "opt_ddb.h"
34
35 #include <sys/param.h>
36 #include <sys/conf.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39 #include <sys/imgact.h>
40 #include <sys/bio.h>
41 #include <sys/buf.h>
42 #include <sys/bus.h>
43 #include <sys/cpu.h>
44 #include <sys/cons.h>
45 #include <sys/exec.h>
46 #include <sys/ucontext.h>
47 #include <sys/proc.h>
48 #include <sys/kdb.h>
49 #include <sys/ptrace.h>
50 #include <sys/reboot.h>
51 #include <sys/signalvar.h>
52 #include <sys/sysent.h>
53 #include <sys/sysproto.h>
54 #include <sys/user.h>
55
56 #include <vm/vm.h>
57 #include <vm/vm_object.h>
58 #include <vm/vm_page.h>
59
60 #include <machine/clock.h>
61 #include <machine/cpu.h>
62 #include <machine/cpuregs.h>
63 #include <machine/hwfunc.h>
64 #include <machine/md_var.h>
65 #include <machine/pmap.h>
66 #include <machine/trap.h>
67
68 #ifdef TICK_USE_YAMON_FREQ
69 #include <mips/malta/yamon.h>
70 #endif
71
72 #ifdef TICK_USE_MALTA_RTC
73 #include <mips/mips4k/malta/maltareg.h>
74 #include <dev/mc146818/mc146818reg.h>
75 #include <isa/rtc.h>
76 #endif
77
78 #include <mips/malta/maltareg.h>
79
80 extern int *edata;
81 extern int *end;
82
83 void lcd_init(void);
84 void lcd_puts(char *);
85 void malta_reset(void);
86
87 /*
88 * Temporary boot environment used at startup.
89 */
90 static char boot1_env[4096];
91
92 /*
93 * Offsets to MALTA LCD characters.
94 */
95 static int malta_lcd_offs[] = {
96 MALTA_ASCIIPOS0,
97 MALTA_ASCIIPOS1,
98 MALTA_ASCIIPOS2,
99 MALTA_ASCIIPOS3,
100 MALTA_ASCIIPOS4,
101 MALTA_ASCIIPOS5,
102 MALTA_ASCIIPOS6,
103 MALTA_ASCIIPOS7
104 };
105
106 void
107 platform_cpu_init()
108 {
109 /* Nothing special */
110 }
111
112 /*
113 * Put character to Malta LCD at given position.
114 */
115 static void
116 malta_lcd_putc(int pos, char c)
117 {
118 void *addr;
119 char *ch;
120
121 if (pos < 0 || pos > 7)
122 return;
123 addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
124 ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
125 *ch = c;
126 }
127
128 /*
129 * Print given string on LCD.
130 */
131 static void
132 malta_lcd_print(char *str)
133 {
134 int i;
135
136 if (str == NULL)
137 return;
138
139 for (i = 0; *str != '\0'; i++, str++)
140 malta_lcd_putc(i, *str);
141 }
142
143 void
144 lcd_init(void)
145 {
146 malta_lcd_print("FreeBSD_");
147 }
148
149 void
150 lcd_puts(char *s)
151 {
152 malta_lcd_print(s);
153 }
154
155 #ifdef TICK_USE_MALTA_RTC
156 static __inline uint8_t
157 rtcin(uint8_t addr)
158 {
159
160 *((volatile uint8_t *)
161 MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
162 return (*((volatile uint8_t *)
163 MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
164 }
165
166 static __inline void
167 writertc(uint8_t addr, uint8_t val)
168 {
169
170 *((volatile uint8_t *)
171 MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
172 *((volatile uint8_t *)
173 MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
174 }
175 #endif
176
177 static void
178 mips_init(unsigned long memsize, uint64_t ememsize)
179 {
180 int i;
181
182 for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
183 phys_avail[i] = 0;
184 }
185
186 /*
187 * memsize is the amount of RAM available below 256MB.
188 * ememsize is the total amount of RAM available.
189 *
190 * The second bank starts at 0x90000000.
191 */
192
193 /* phys_avail regions are in bytes */
194 phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
195 phys_avail[1] = memsize;
196 dump_avail[0] = 0;
197 dump_avail[1] = phys_avail[1];
198
199 /* Only specify the extended region if it's set */
200 if (ememsize > memsize) {
201 phys_avail[2] = 0x90000000;
202 phys_avail[3] = 0x90000000 + (ememsize - memsize);
203 dump_avail[2] = phys_avail[2];
204 dump_avail[3] = phys_avail[3];
205 }
206
207 /* XXX realmem assigned in the caller of mips_init() */
208 physmem = realmem;
209
210 init_param1();
211 init_param2(physmem);
212 mips_cpu_init();
213 pmap_bootstrap();
214 mips_proc0_init();
215 mutex_init();
216 kdb_init();
217 #ifdef KDB
218 if (boothowto & RB_KDB)
219 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
220 #endif
221 }
222
223 /*
224 * Perform a board-level soft-reset.
225 * Note that this is not emulated by gxemul.
226 */
227 void
228 platform_reset(void)
229 {
230 char *c;
231
232 c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
233 *c = MALTA_GORESET;
234 }
235
236 static uint64_t
237 malta_cpu_freq(void)
238 {
239 uint64_t platform_counter_freq = 0;
240
241 #if defined(TICK_USE_YAMON_FREQ)
242 /*
243 * If we are running on a board which uses YAMON firmware,
244 * then query CPU pipeline clock from the syscon object.
245 * If unsuccessful, use hard-coded default.
246 */
247 platform_counter_freq = yamon_getcpufreq();
248
249 #elif defined(TICK_USE_MALTA_RTC)
250 /*
251 * If we are running on a board with the MC146818 RTC,
252 * use it to determine CPU pipeline clock frequency.
253 */
254 u_int64_t counterval[2];
255
256 /* Set RTC to binary mode. */
257 writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
258
259 /* Busy-wait for falling edge of RTC update. */
260 while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
261 ;
262 while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
263 ;
264 counterval[0] = mips_rd_count();
265
266 /* Busy-wait for falling edge of RTC update. */
267 while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
268 ;
269 while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
270 ;
271 counterval[1] = mips_rd_count();
272
273 platform_counter_freq = counterval[1] - counterval[0];
274 #endif
275
276 if (platform_counter_freq == 0)
277 platform_counter_freq = MIPS_DEFAULT_HZ;
278
279 return (platform_counter_freq);
280 }
281
282 void
283 platform_start(__register_t a0, __register_t a1, __register_t a2,
284 __register_t a3)
285 {
286 vm_offset_t kernend;
287 uint64_t platform_counter_freq;
288 int argc = a0;
289 int32_t *argv = (int32_t*)a1;
290 int32_t *envp = (int32_t*)a2;
291 unsigned int memsize = a3;
292 uint64_t ememsize = 0;
293 int i;
294
295 /* clear the BSS and SBSS segments */
296 kernend = (vm_offset_t)&end;
297 memset(&edata, 0, kernend - (vm_offset_t)(&edata));
298
299 mips_postboot_fixup();
300
301 mips_pcpu0_init();
302 platform_counter_freq = malta_cpu_freq();
303 mips_timer_early_init(platform_counter_freq);
304 init_static_kenv(boot1_env, sizeof(boot1_env));
305
306 cninit();
307 printf("entry: platform_start()\n");
308
309 bootverbose = 1;
310
311 /*
312 * YAMON uses 32bit pointers to strings so
313 * convert them to proper type manually
314 */
315
316 if (bootverbose) {
317 printf("cmd line: ");
318 for (i = 0; i < argc; i++)
319 printf("%s ", (char*)(intptr_t)argv[i]);
320 printf("\n");
321 }
322
323 if (bootverbose)
324 printf("envp:\n");
325
326 /*
327 * Parse the environment for things like ememsize.
328 */
329 for (i = 0; envp[i]; i += 2) {
330 const char *a, *v;
331
332 a = (char *)(intptr_t)envp[i];
333 v = (char *)(intptr_t)envp[i+1];
334
335 if (bootverbose)
336 printf("\t%s = %s\n", a, v);
337
338 if (strcmp(a, "ememsize") == 0) {
339 ememsize = strtoul(v, NULL, 0);
340 }
341 }
342
343 if (bootverbose) {
344 printf("memsize = %llu (0x%08x)\n",
345 (unsigned long long) memsize, memsize);
346 printf("ememsize = %llu\n", (unsigned long long) ememsize);
347
348 #ifdef __mips_o32
349 /*
350 * For O32 phys_avail[] can't address memory beyond 2^32,
351 * so cap extended memory to 2GB minus one page.
352 */
353 if (ememsize >= 2ULL * 1024 * 1024 * 1024)
354 ememsize = 2ULL * 1024 * 1024 * 1024 - PAGE_SIZE;
355 #endif
356 }
357
358 /*
359 * For <= 256MB RAM amounts, ememsize should equal memsize.
360 * For > 256MB RAM amounts it's the total RAM available;
361 * split between two banks.
362 *
363 * XXX TODO: just push realmem assignment into mips_init() ?
364 */
365 realmem = btoc(ememsize);
366 mips_init(memsize, ememsize);
367
368 mips_timer_init_params(platform_counter_freq, 0);
369 }
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