sb_machdep.c revision 232853 
1/*-
2 * Copyright (c) 2007 Bruce M. Simpson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/mips/sibyte/sb_machdep.c 232853 2012-03-12 07:34:15Z jmallett $");
29
30#include "opt_ddb.h"
31#include "opt_kdb.h"
32
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/imgact.h>
38#include <sys/bio.h>
39#include <sys/buf.h>
40#include <sys/bus.h>
41#include <sys/cpu.h>
42#include <sys/cons.h>
43#include <sys/exec.h>
44#include <sys/ucontext.h>
45#include <sys/proc.h>
46#include <sys/kdb.h>
47#include <sys/ptrace.h>
48#include <sys/reboot.h>
49#include <sys/signalvar.h>
50#include <sys/sysent.h>
51#include <sys/sysproto.h>
52#include <sys/user.h>
53#include <sys/timetc.h>
54
55#include <vm/vm.h>
56#include <vm/vm_object.h>
57#include <vm/vm_page.h>
58#include <vm/vm_pager.h>
59
60#include <machine/cache.h>
61#include <machine/clock.h>
62#include <machine/cpu.h>
63#include <machine/cpuinfo.h>
64#include <machine/cpufunc.h>
65#include <machine/cpuregs.h>
66#include <machine/hwfunc.h>
67#include <machine/intr_machdep.h>
68#include <machine/locore.h>
69#include <machine/md_var.h>
70#include <machine/pte.h>
71#include <machine/sigframe.h>
72#include <machine/trap.h>
73#include <machine/vmparam.h>
74
75#ifdef SMP
76#include <sys/smp.h>
77#include <machine/smp.h>
78#endif
79
80#ifdef CFE
81#include <dev/cfe/cfe_api.h>
82#endif
83
84#include "sb_scd.h"
85
86#ifdef DDB
87#ifndef KDB
88#error KDB must be enabled in order for DDB to work!
89#endif
90#endif
91
92#ifdef CFE_ENV
93extern void cfe_env_init(void);
94#endif
95
96extern int *edata;
97extern int *end;
98
99extern char MipsTLBMiss[], MipsTLBMissEnd[];
100
101void
102platform_cpu_init()
103{
104	/* Nothing special */
105}
106
107static void
108sb_intr_init(int cpuid)
109{
110	int intrnum, intsrc;
111
112	/*
113	 * Disable all sources to the interrupt mapper and setup the mapping
114	 * between an interrupt source and the mips hard interrupt number.
115	 */
116	for (intsrc = 0; intsrc < NUM_INTSRC; ++intsrc) {
117		intrnum = sb_route_intsrc(intsrc);
118		sb_disable_intsrc(cpuid, intsrc);
119		sb_write_intmap(cpuid, intsrc, intrnum);
120#ifdef SMP
121		/*
122		 * Set up the mailbox interrupt mapping.
123		 *
124		 * The mailbox interrupt is "special" in that it is not shared
125		 * with any other interrupt source.
126		 */
127		if (intsrc == INTSRC_MAILBOX3) {
128			intrnum = platform_ipi_intrnum();
129			sb_write_intmap(cpuid, INTSRC_MAILBOX3, intrnum);
130			sb_enable_intsrc(cpuid, INTSRC_MAILBOX3);
131		}
132#endif
133	}
134}
135
136static void
137mips_init(void)
138{
139	int i, j, cfe_mem_idx, tmp;
140	uint64_t maxmem;
141
142#ifdef CFE_ENV
143	cfe_env_init();
144#endif
145
146	TUNABLE_INT_FETCH("boothowto", &boothowto);
147
148	if (boothowto & RB_VERBOSE)
149		bootverbose++;
150
151#ifdef MAXMEM
152	tmp = MAXMEM;
153#else
154	tmp = 0;
155#endif
156	TUNABLE_INT_FETCH("hw.physmem", &tmp);
157	maxmem = (uint64_t)tmp * 1024;
158
159	/*
160	 * XXX
161	 * If we used vm_paddr_t consistently in pmap, etc., we could
162	 * use 64-bit page numbers on !n64 systems, too, like i386
163	 * does with PAE.
164	 */
165#if !defined(__mips_n64)
166	if (maxmem == 0 || maxmem > 0xffffffff)
167		maxmem = 0xffffffff;
168#endif
169
170#ifdef CFE
171	/*
172	 * Query DRAM memory map from CFE.
173	 */
174	physmem = 0;
175	cfe_mem_idx = 0;
176	for (i = 0; i < 10; i += 2) {
177		int result;
178		uint64_t addr, len, type;
179
180		result = cfe_enummem(cfe_mem_idx++, 0, &addr, &len, &type);
181		if (result < 0) {
182			phys_avail[i] = phys_avail[i + 1] = 0;
183			break;
184		}
185
186		KASSERT(type == CFE_MI_AVAILABLE,
187			("CFE DRAM region is not available?"));
188
189		if (bootverbose)
190			printf("cfe_enummem: 0x%016jx/%ju.\n", addr, len);
191
192		if (maxmem != 0) {
193			if (addr >= maxmem) {
194				printf("Ignoring %ju bytes of memory at 0x%jx "
195				       "that is above maxmem %dMB\n",
196				       len, addr,
197				       (int)(maxmem / (1024 * 1024)));
198				continue;
199			}
200
201			if (addr + len > maxmem) {
202				printf("Ignoring %ju bytes of memory "
203				       "that is above maxmem %dMB\n",
204				       (addr + len) - maxmem,
205				       (int)(maxmem / (1024 * 1024)));
206				len = maxmem - addr;
207			}
208		}
209
210		phys_avail[i] = addr;
211		if (i == 0 && addr == 0) {
212			/*
213			 * If this is the first physical memory segment probed
214			 * from CFE, omit the region at the start of physical
215			 * memory where the kernel has been loaded.
216			 */
217			phys_avail[i] += MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
218		}
219		phys_avail[i + 1] = addr + len;
220		physmem += len;
221	}
222
223	realmem = btoc(physmem);
224#endif
225
226	for (j = 0; j < i; j++)
227		dump_avail[j] = phys_avail[j];
228
229	physmem = realmem;
230
231	init_param1();
232	init_param2(physmem);
233	mips_cpu_init();
234
235	/*
236	 * Sibyte has a L1 data cache coherent with DMA. This includes
237	 * on-chip network interfaces as well as PCI/HyperTransport bus
238	 * masters.
239	 */
240	cpuinfo.cache_coherent_dma = TRUE;
241
242	/*
243	 * XXX
244	 * The kernel is running in 32-bit mode but the CFE is running in
245	 * 64-bit mode. So the SR_KX bit in the status register is turned
246	 * on by the CFE every time we call into it - for e.g. CFE_CONSOLE.
247	 *
248	 * This means that if get a TLB miss for any address above 0xc0000000
249	 * and the SR_KX bit is set then we will end up in the XTLB exception
250	 * vector.
251	 *
252	 * For now work around this by copying the TLB exception handling
253	 * code to the XTLB exception vector.
254	 */
255	{
256		bcopy(MipsTLBMiss, (void *)MIPS_XTLB_MISS_EXC_VEC,
257		      MipsTLBMissEnd - MipsTLBMiss);
258
259		mips_icache_sync_all();
260		mips_dcache_wbinv_all();
261	}
262
263	pmap_bootstrap();
264	mips_proc0_init();
265	mutex_init();
266
267	kdb_init();
268#ifdef KDB
269	if (boothowto & RB_KDB)
270		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
271#endif
272}
273
274void
275platform_reset(void)
276{
277
278	/*
279	 * XXX SMP
280	 * XXX flush data caches
281	 */
282	sb_system_reset();
283}
284
285static void
286kseg0_map_coherent(void)
287{
288	uint32_t config;
289	const int CFG_K0_COHERENT = 5;
290
291	config = mips_rd_config();
292	config &= ~MIPS_CONFIG_K0_MASK;
293	config |= CFG_K0_COHERENT;
294	mips_wr_config(config);
295}
296
297#ifdef SMP
298void
299platform_ipi_send(int cpuid)
300{
301	KASSERT(cpuid == 0 || cpuid == 1,
302		("platform_ipi_send: invalid cpuid %d", cpuid));
303
304	sb_set_mailbox(cpuid, 1ULL);
305}
306
307void
308platform_ipi_clear(void)
309{
310	int cpuid;
311
312	cpuid = PCPU_GET(cpuid);
313	sb_clear_mailbox(cpuid, 1ULL);
314}
315
316int
317platform_ipi_intrnum(void)
318{
319
320	return (4);
321}
322
323struct cpu_group *
324platform_smp_topo(void)
325{
326
327	return (smp_topo_none());
328}
329
330void
331platform_init_ap(int cpuid)
332{
333	int ipi_int_mask, clock_int_mask;
334
335	KASSERT(cpuid == 1, ("AP has an invalid cpu id %d", cpuid));
336
337	/*
338	 * Make sure that kseg0 is mapped cacheable-coherent
339	 */
340	kseg0_map_coherent();
341
342	sb_intr_init(cpuid);
343
344	/*
345	 * Unmask the clock and ipi interrupts.
346	 */
347	clock_int_mask = hard_int_mask(5);
348	ipi_int_mask = hard_int_mask(platform_ipi_intrnum());
349	set_intr_mask(ipi_int_mask | clock_int_mask);
350}
351
352int
353platform_start_ap(int cpuid)
354{
355#ifdef CFE
356	int error;
357
358	if ((error = cfe_cpu_start(cpuid, mpentry, 0, 0, 0))) {
359		printf("cfe_cpu_start error: %d\n", error);
360		return (-1);
361	} else {
362		return (0);
363	}
364#else
365	return (-1);
366#endif	/* CFE */
367}
368#endif	/* SMP */
369
370static u_int
371sb_get_timecount(struct timecounter *tc)
372{
373
374	return ((u_int)sb_zbbus_cycle_count());
375}
376
377static void
378sb_timecounter_init(void)
379{
380	static struct timecounter sb_timecounter = {
381		sb_get_timecount,
382		NULL,
383		~0u,
384		0,
385		"sibyte_zbbus_counter",
386		2000
387	};
388
389	/*
390	 * The ZBbus cycle counter runs at half the cpu frequency.
391	 */
392	sb_timecounter.tc_frequency = sb_cpu_speed() / 2;
393	platform_timecounter = &sb_timecounter;
394}
395
396void
397platform_start(__register_t a0, __register_t a1, __register_t a2,
398	       __register_t a3)
399{
400	/*
401	 * Make sure that kseg0 is mapped cacheable-coherent
402	 */
403	kseg0_map_coherent();
404
405	/* clear the BSS and SBSS segments */
406	memset(&edata, 0, (vm_offset_t)&end - (vm_offset_t)&edata);
407	mips_postboot_fixup();
408
409	sb_intr_init(0);
410	sb_timecounter_init();
411
412	/* Initialize pcpu stuff */
413	mips_pcpu0_init();
414
415#ifdef CFE
416	/*
417	 * Initialize CFE firmware trampolines before
418	 * we initialize the low-level console.
419	 *
420	 * CFE passes the following values in registers:
421	 * a0: firmware handle
422	 * a2: firmware entry point
423	 * a3: entry point seal
424	 */
425	if (a3 == CFE_EPTSEAL)
426		cfe_init(a0, a2);
427#endif
428	cninit();
429
430	mips_init();
431
432	mips_timer_init_params(sb_cpu_speed(), 0);
433}
434