xref: /netbsd/sys/arch/evbppc/explora/machdep.c (revision 6550d01e) 
1 /*	$NetBSD: machdep.c,v 1.32 2011/01/14 02:06:25 rmind Exp $	*/
2 
3 /*-
4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Juergen Hannken-Illjes.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.32 2011/01/14 02:06:25 rmind Exp $");
34 
35 #include "opt_explora.h"
36 #include "opt_modular.h"
37 #include "ksyms.h"
38 
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/buf.h>
42 #include <sys/msgbuf.h>
43 #include <sys/kernel.h>
44 #include <sys/mount.h>
45 #include <sys/proc.h>
46 #include <sys/reboot.h>
47 #include <sys/ksyms.h>
48 #include <sys/device.h>
49 
50 #include <uvm/uvm_extern.h>
51 
52 #include <prop/proplib.h>
53 
54 #include <machine/explora.h>
55 #include <machine/bus.h>
56 #include <machine/powerpc.h>
57 #include <machine/tlb.h>
58 #include <machine/pcb.h>
59 #include <machine/trap.h>
60 
61 #include <powerpc/spr.h>
62 #include <powerpc/ibm4xx/spr.h>
63 #include <powerpc/ibm4xx/dcr403cgx.h>
64 
65 #if NKSYMS || defined(DDB) || defined(MODULAR)
66 #include <machine/db_machdep.h>
67 #include <ddb/db_extern.h>
68 #endif
69 
70 #define MEMREGIONS	2
71 #define TLB_PG_SIZE	(16*1024*1024)
72 
73 char cpu_model[80];
74 char machine[] = MACHINE;		/* from <machine/param.h> */
75 char machine_arch[] = MACHINE_ARCH;	/* from <machine/param.h> */
76 
77 static const unsigned int cpuspeed = 66000000;
78 
79 prop_dictionary_t board_properties;
80 struct vm_map *phys_map = NULL;
81 char msgbuf[MSGBUFSIZE];
82 paddr_t msgbuf_paddr;
83 
84 static struct mem_region phys_mem[MEMREGIONS];
85 static struct mem_region avail_mem[MEMREGIONS];
86 
87 void		bootstrap(u_int, u_int);
88 static void	install_extint(void (*)(void));
89 int		lcsplx(int);
90 
91 /*
92  * Trap vectors
93  */
94 extern int defaulttrap, defaultsize;
95 extern int sctrap, scsize;
96 extern int alitrap, alisize;
97 extern int dsitrap, dsisize;
98 extern int isitrap, isisize;
99 extern int mchktrap, mchksize;
100 extern int tlbimiss4xx, tlbim4size;
101 extern int tlbdmiss4xx, tlbdm4size;
102 extern int pitfitwdog, pitfitwdogsize;
103 extern int debugtrap, debugsize;
104 extern int errata51handler, errata51size;
105 #ifdef DDB
106 extern int ddblow, ddbsize;
107 #endif
108 static struct {
109 	int vector;
110 	void *addr;
111 	void *size;
112 } trap_table[] = {
113 	{ EXC_SC,	&sctrap,	&scsize },
114 	{ EXC_ALI,	&alitrap,	&alisize },
115 	{ EXC_DSI,	&dsitrap,	&dsisize },
116 	{ EXC_ISI,	&isitrap,	&isisize },
117 	{ EXC_MCHK,	&mchktrap,	&mchksize },
118 	{ EXC_ITMISS,	&tlbimiss4xx,	&tlbim4size },
119 	{ EXC_DTMISS,	&tlbdmiss4xx,	&tlbdm4size },
120 	{ EXC_PIT,	&pitfitwdog,	&pitfitwdogsize },
121 	{ EXC_DEBUG,	&debugtrap,	&debugsize },
122 	{ (EXC_DTMISS|EXC_ALI), &errata51handler, &errata51size },
123 #if defined(DDB)
124 	{ EXC_PGM,	&ddblow,	&ddbsize },
125 #endif /* DDB */
126 };
127 
128 /*
129  * Install a trap vector. We cannot use memcpy because the
130  * destination may be zero.
131  */
132 static void
133 trap_copy(void *src, int dest, size_t len)
134 {
135 	uint32_t *src_p = src;
136 	uint32_t *dest_p = (void *)dest;
137 
138 	while (len > 0) {
139 		*dest_p++ = *src_p++;
140 		len -= sizeof(uint32_t);
141 	}
142 }
143 
144 void
145 bootstrap(u_int startkernel, u_int endkernel)
146 {
147 	u_int i, j, t, br[4];
148 	u_int maddr, msize, size;
149 	struct cpu_info * const ci = &cpu_info[0];
150 
151 	br[0] = mfdcr(DCR_BR4);
152 	br[1] = mfdcr(DCR_BR5);
153 	br[2] = mfdcr(DCR_BR6);
154 	br[3] = mfdcr(DCR_BR7);
155 
156 	for (i = 0; i < 4; i++)
157 		for (j = i+1; j < 4; j++)
158 			if (br[j] < br[i])
159 				t = br[j], br[j] = br[i], br[i] = t;
160 
161 	for (i = 0, size = 0; i < 4; i++) {
162 		if (((br[i] >> 19) & 3) != 3)
163 			continue;
164 		maddr = ((br[i] >> 24) & 0xff) << 20;
165 		msize = 1 << (20 + ((br[i] >> 21) & 7));
166 		if (maddr+msize > size)
167 			size = maddr+msize;
168 	}
169 
170 	phys_mem[0].start = 0;
171 	phys_mem[0].size = size & ~PGOFSET;
172 	avail_mem[0].start = startkernel;
173 	avail_mem[0].size = size-startkernel;
174 
175 	__asm volatile(
176 	    "	mtpid %0	\n"
177 	    "	sync		\n"
178 	    : : "r" (KERNEL_PID) );
179 
180 	/*
181 	 * Setup initial tlbs.
182 	 * Kernel memory and console device are
183 	 * mapped into the first (reserved) tlbs.
184 	 */
185 
186 	for (maddr = 0; maddr < endkernel; maddr += TLB_PG_SIZE)
187 		ppc4xx_tlb_reserve(maddr, maddr, TLB_PG_SIZE, TLB_EX);
188 
189 	/* Map PCKBC, PCKBC2, COM, LPT. This is far beyond physmem. */
190 	ppc4xx_tlb_reserve(BASE_ISA, BASE_ISA, TLB_PG_SIZE, TLB_I | TLB_G);
191 
192 #ifndef COM_IS_CONSOLE
193 	ppc4xx_tlb_reserve(BASE_FB,  BASE_FB,  TLB_PG_SIZE, TLB_I | TLB_G);
194 	ppc4xx_tlb_reserve(BASE_FB2, BASE_FB2, TLB_PG_SIZE, TLB_I | TLB_G);
195 #endif
196 
197 	consinit();
198 
199 	/* Disable all external interrupts */
200 	mtdcr(DCR_EXIER, 0);
201 
202 	/* Disable all timer interrupts */
203 	mtspr(SPR_TCR, 0);
204 
205 	/* Initialize cache info for memcpy, etc. */
206 	cpu_probe_cache();
207 
208 	/*
209 	 * Initialize lwp0 and current pcb and pmap pointers.
210 	 */
211 	lwp0.l_cpu = ci;
212 
213 	curpcb = lwp_getpcb(&lwp0);
214 	memset(curpcb, 0, sizeof(struct pcb));	/* XXX why? */
215 	curpcb->pcb_pm = pmap_kernel();
216 
217 	/*
218 	 * Install trap vectors.
219 	 */
220 
221 	for (i = EXC_RSVD; i <= EXC_LAST; i += 0x100)
222 		trap_copy(&defaulttrap, i, (size_t)&defaultsize);
223 
224 	for (i = 0; i < sizeof(trap_table)/sizeof(trap_table[0]); i++) {
225 		trap_copy(trap_table[i].addr, trap_table[i].vector,
226 		    (size_t)trap_table[i].size);
227 	}
228 
229 	__syncicache((void *)EXC_RST, EXC_LAST - EXC_RST + 0x100);
230 
231 	/*
232 	 * Set Exception vector base.
233 	 * Handle trap instruction as PGM exception.
234 	 */
235 
236 	mtspr(SPR_EVPR, 0);
237 
238 	t = mfspr(SPR_DBCR0);
239 	t &= ~DBCR0_TDE;
240 	mtspr(SPR_DBCR0, t);
241 
242 	/*
243 	 * External interrupt handler install.
244 	 */
245 
246 	install_extint(ext_intr);
247 
248 	/*
249 	 * Now enable translation (and machine checks/recoverable interrupts).
250 	 */
251 	__asm volatile (
252 	    "	mfmsr %0	\n"
253 	    "	ori %0,%0,%1	\n"
254 	    "	mtmsr %0	\n"
255 	    "	sync		\n"
256 	    : : "r" (0), "K" (PSL_IR|PSL_DR|PSL_ME) );
257 
258 	uvm_setpagesize();
259 
260 	/*
261 	 * Initialize pmap module.
262 	 */
263 	pmap_bootstrap(startkernel, endkernel);
264 	fake_mapiodev = 0;
265 }
266 
267 static void
268 install_extint(void (*handler)(void))
269 {
270 	extern int extint, extsize;
271 	extern u_long extint_call;
272 	u_long offset = (u_long)handler - (u_long)&extint_call;
273 	int omsr, msr;
274 
275 #ifdef	DIAGNOSTIC
276 	if (offset > 0x1ffffff)
277 		panic("install_extint: too far away");
278 #endif
279 	__asm volatile (
280 	    "	mfmsr %0	\n"
281 	    "	andi. %1,%0,%2	\n"
282 	    "	mtmsr %1	\n"
283 	    : "=r" (omsr), "=r" (msr) : "K" ((u_short)~PSL_EE) );
284 	extint_call = (extint_call & 0xfc000003) | offset;
285 	memcpy((void *)EXC_EXI, &extint, (size_t)&extsize);
286 	__syncicache((void *)&extint_call, sizeof extint_call);
287 	__syncicache((void *)EXC_EXI, (int)&extsize);
288 	__asm volatile (
289 	    "	mtmsr %0	\n"
290 	    : : "r" (omsr) );
291 }
292 
293 void
294 cpu_startup(void)
295 {
296 	vaddr_t minaddr, maxaddr;
297 	prop_number_t pn;
298 	char pbuf[9];
299 
300 	/*
301 	 * Initialize error message buffer (before start of kernel)
302 	 */
303 	initmsgbuf((void *)msgbuf, round_page(MSGBUFSIZE));
304 
305 	printf("%s%s", copyright, version);
306 	printf("NCD Explora451\n");
307 
308 	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
309 	printf("total memory = %s\n", pbuf);
310 
311 	minaddr = 0;
312 	/*
313 	 * Allocate a submap for physio
314 	 */
315 	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
316 				 VM_PHYS_SIZE, 0, false, NULL);
317 
318 	/*
319 	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
320 	 * are allocated via the pool allocator, and we use direct-mapped
321 	 * pool pages.
322 	 */
323 
324 	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
325 	printf("avail memory = %s\n", pbuf);
326 
327 	/*
328 	 * Set up the board properties database.
329 	 */
330 	board_properties = prop_dictionary_create();
331 	KASSERT(board_properties != NULL);
332 
333 	pn = prop_number_create_integer(ctob(physmem));
334 	KASSERT(pn != NULL);
335 	if (prop_dictionary_set(board_properties, "mem-size", pn) == false)
336 		panic("setting mem-size");
337 	prop_object_release(pn);
338 
339 	pn = prop_number_create_integer(cpuspeed);
340 	KASSERT(pn != NULL);
341 	if (prop_dictionary_set(board_properties, "processor-frequency",
342 				pn) == false)
343 		panic("setting processor-frequency");
344 	prop_object_release(pn);
345 
346 	intr_init();
347 }
348 
349 int
350 lcsplx(int ipl)
351 {
352 	return spllower(ipl);	/*XXX*/
353 }
354 
355 void
356 cpu_reboot(int howto, char *what)
357 {
358 	static int syncing = 0;
359 
360 	boothowto = howto;
361 	if (!cold && !(howto & RB_NOSYNC) && !syncing) {
362 		syncing = 1;
363 		vfs_shutdown();
364 		resettodr();
365 	}
366 
367 	splhigh();
368 
369 	if (!cold && (howto & RB_DUMP))
370 		/*XXX dumpsys()*/;
371 
372 	doshutdownhooks();
373 
374 	pmf_system_shutdown(boothowto);
375 
376 	if (howto & RB_HALT) {
377 		printf("halted\n\n");
378 
379 		while (1)
380 			;
381 	}
382 
383 	printf("rebooting\n\n");
384 
385 	/* flush cache for msgbuf */
386 	__syncicache((void *)msgbuf_paddr, round_page(MSGBUFSIZE));
387 
388 	ppc4xx_reset();
389 
390 #ifdef DDB
391 	while (1)
392 		Debugger();
393 #else
394 	while (1)
395 		;
396 #endif
397 }
398 
399 void
400 mem_regions(struct mem_region **mem, struct mem_region **avail)
401 {
402 	*mem = phys_mem;
403 	*avail = avail_mem;
404 }
405