sb_machdep.c revision 201631 
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: projects/mips/sys/mips/sibyte/sb_machdep.c 201631 2010-01-06 06:42:08Z neel $");
29
30#include <sys/param.h>
31#include <machine/cpuregs.h>
32
33#include "opt_ddb.h"
34#include "opt_kdb.h"
35
36#include <sys/param.h>
37#include <sys/conf.h>
38#include <sys/kernel.h>
39#include <sys/systm.h>
40#include <sys/imgact.h>
41#include <sys/bio.h>
42#include <sys/buf.h>
43#include <sys/bus.h>
44#include <sys/cpu.h>
45#include <sys/cons.h>
46#include <sys/exec.h>
47#include <sys/ucontext.h>
48#include <sys/proc.h>
49#include <sys/kdb.h>
50#include <sys/ptrace.h>
51#include <sys/reboot.h>
52#include <sys/signalvar.h>
53#include <sys/sysent.h>
54#include <sys/sysproto.h>
55#include <sys/user.h>
56
57#include <vm/vm.h>
58#include <vm/vm_object.h>
59#include <vm/vm_page.h>
60#include <vm/vm_pager.h>
61
62#include <machine/cache.h>
63#include <machine/clock.h>
64#include <machine/cpu.h>
65#include <machine/cpuinfo.h>
66#include <machine/cpufunc.h>
67#include <machine/cpuregs.h>
68#include <machine/hwfunc.h>
69#include <machine/intr_machdep.h>
70#include <machine/locore.h>
71#include <machine/md_var.h>
72#include <machine/pte.h>
73#include <machine/sigframe.h>
74#include <machine/trap.h>
75#include <machine/vmparam.h>
76
77#ifdef CFE
78#include <dev/cfe/cfe_api.h>
79#endif
80
81#include "sb_scd.h"
82
83#ifdef DDB
84#ifndef KDB
85#error KDB must be enabled in order for DDB to work!
86#endif
87#endif
88
89#ifdef CFE_ENV
90extern void cfe_env_init(void);
91#endif
92
93extern int *edata;
94extern int *end;
95
96void
97platform_cpu_init()
98{
99	/* Nothing special */
100}
101
102static void
103mips_init(void)
104{
105	int i, cfe_mem_idx, tmp;
106	uint64_t maxmem;
107
108#ifdef CFE_ENV
109	cfe_env_init();
110#endif
111
112	TUNABLE_INT_FETCH("boothowto", &boothowto);
113
114	if (boothowto & RB_VERBOSE)
115		bootverbose++;
116
117#ifdef MAXMEM
118	tmp = MAXMEM;
119#else
120	tmp = 0;
121#endif
122	TUNABLE_INT_FETCH("hw.physmem", &tmp);
123	maxmem = (uint64_t)tmp * 1024;
124
125#ifdef CFE
126	/*
127	 * Query DRAM memory map from CFE.
128	 */
129	physmem = 0;
130	cfe_mem_idx = 0;
131	for (i = 0; i < 10; i += 2) {
132		int result;
133		uint64_t addr, len, type;
134
135		result = cfe_enummem(cfe_mem_idx++, 0, &addr, &len, &type);
136		if (result < 0) {
137			phys_avail[i] = phys_avail[i + 1] = 0;
138			break;
139		}
140
141		KASSERT(type == CFE_MI_AVAILABLE,
142			("CFE DRAM region is not available?"));
143
144		if (bootverbose)
145			printf("cfe_enummem: 0x%016jx/%llu.\n", addr, len);
146
147		if (maxmem != 0) {
148			if (addr >= maxmem) {
149				printf("Ignoring %llu bytes of memory at 0x%jx "
150				       "that is above maxmem %dMB\n",
151				       len, addr,
152				       (int)(maxmem / (1024 * 1024)));
153				continue;
154			}
155
156			if (addr + len > maxmem) {
157				printf("Ignoring %llu bytes of memory "
158				       "that is above maxmem %dMB\n",
159				       (addr + len) - maxmem,
160				       (int)(maxmem / (1024 * 1024)));
161				len = maxmem - addr;
162			}
163		}
164
165		phys_avail[i] = addr;
166		if (i == 0 && addr == 0) {
167			/*
168			 * If this is the first physical memory segment probed
169			 * from CFE, omit the region at the start of physical
170			 * memory where the kernel has been loaded.
171			 */
172			phys_avail[i] += MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
173		}
174		phys_avail[i + 1] = addr + len;
175		physmem += len;
176	}
177
178	realmem = btoc(physmem);
179#endif
180
181	physmem = realmem;
182
183	init_param1();
184	init_param2(physmem);
185	mips_cpu_init();
186	pmap_bootstrap();
187	mips_proc0_init();
188	mutex_init();
189
190	kdb_init();
191#ifdef KDB
192	if (boothowto & RB_KDB)
193		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
194#endif
195}
196
197void
198platform_halt(void)
199{
200
201}
202
203
204void
205platform_identify(void)
206{
207
208}
209
210void
211platform_reset(void)
212{
213
214	/*
215	 * XXX SMP
216	 * XXX flush data caches
217	 */
218	sb_system_reset();
219}
220
221void
222platform_trap_enter(void)
223{
224
225}
226
227void
228platform_trap_exit(void)
229{
230
231}
232
233void
234platform_start(__register_t a0, __register_t a1, __register_t a2,
235	       __register_t a3)
236{
237	vm_offset_t kernend;
238
239	/* clear the BSS and SBSS segments */
240	memset(&edata, 0, (vm_offset_t)&end - (vm_offset_t)&edata);
241	kernend = round_page((vm_offset_t)&end);
242
243#ifdef CFE
244	/*
245	 * Initialize CFE firmware trampolines before
246	 * we initialize the low-level console.
247	 *
248	 * CFE passes the following values in registers:
249	 * a0: firmware handle
250	 * a2: firmware entry point
251	 * a3: entry point seal
252	 */
253	if (a3 == CFE_EPTSEAL)
254		cfe_init(a0, a2);
255#endif
256	cninit();
257
258	mips_init();
259
260	mips_timer_init_params(sb_cpu_speed(), 0);
261}
262