1 /*-
2 * Copyright (c) 2005 Peter Grehan
3 * Copyright (c) 2009 Nathan Whitehorn
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/9.0/sys/powerpc/powerpc/platform.c 227712 2011-11-19 12:55:34Z marius $");
31
32 /*
33 * Dispatch platform calls to the appropriate platform implementation
34 * through a previously registered kernel object.
35 */
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/ktr.h>
41 #include <sys/mutex.h>
42 #include <sys/systm.h>
43 #include <sys/smp.h>
44 #include <sys/sysctl.h>
45 #include <sys/types.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_page.h>
49
50 #include <machine/cpu.h>
51 #include <machine/md_var.h>
52 #include <machine/platform.h>
53 #include <machine/platformvar.h>
54 #include <machine/smp.h>
55
56 #include "platform_if.h"
57
58 static platform_def_t *plat_def_impl;
59 static platform_t plat_obj;
60 static struct kobj_ops plat_kernel_kops;
61 static struct platform_kobj plat_kernel_obj;
62
63 static char plat_name[64] = "";
64 SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RD | CTLFLAG_TUN,
65 plat_name, 0, "Platform currently in use");
66
67 static struct mem_region *pregions = NULL;
68 static struct mem_region *aregions = NULL;
69 static int npregions, naregions;
70
71 void
72 mem_regions(struct mem_region **phys, int *physsz, struct mem_region **avail,
73 int *availsz)
74 {
75 if (pregions == NULL)
76 PLATFORM_MEM_REGIONS(plat_obj, &pregions, &npregions,
77 &aregions, &naregions);
78
79 *phys = pregions;
80 *avail = aregions;
81 *physsz = npregions;
82 *availsz = naregions;
83 }
84
85 int
86 mem_valid(vm_offset_t addr, int len)
87 {
88 int i;
89
90 if (pregions == NULL)
91 PLATFORM_MEM_REGIONS(plat_obj, &pregions, &npregions,
92 &aregions, &naregions);
93
94 for (i = 0; i < npregions; i++)
95 if ((addr >= pregions[i].mr_start)
96 && (addr + len <= pregions[i].mr_start + pregions[i].mr_size))
97 return (0);
98
99 return (EFAULT);
100 }
101
102 vm_offset_t
103 platform_real_maxaddr(void)
104 {
105 return (PLATFORM_REAL_MAXADDR(plat_obj));
106 }
107
108 const char *
109 installed_platform()
110 {
111 return (plat_def_impl->name);
112 }
113
114 u_long
115 platform_timebase_freq(struct cpuref *cpu)
116 {
117 return (PLATFORM_TIMEBASE_FREQ(plat_obj, cpu));
118 }
119
120 int
121 platform_smp_first_cpu(struct cpuref *cpu)
122 {
123 return (PLATFORM_SMP_FIRST_CPU(plat_obj, cpu));
124 }
125
126 int
127 platform_smp_next_cpu(struct cpuref *cpu)
128 {
129 return (PLATFORM_SMP_NEXT_CPU(plat_obj, cpu));
130 }
131
132 int
133 platform_smp_get_bsp(struct cpuref *cpu)
134 {
135 return (PLATFORM_SMP_GET_BSP(plat_obj, cpu));
136 }
137
138 int
139 platform_smp_start_cpu(struct pcpu *cpu)
140 {
141 return (PLATFORM_SMP_START_CPU(plat_obj, cpu));
142 }
143
144 #ifdef SMP
145 struct cpu_group *
146 cpu_topo(void)
147 {
148 return (PLATFORM_SMP_TOPO(plat_obj));
149 }
150 #endif
151
152 /*
153 * Reset back to firmware.
154 */
155 void
156 cpu_reset()
157 {
158 PLATFORM_RESET(plat_obj);
159 }
160
161 /*
162 * Platform install routines. Highest priority wins, using the same
163 * algorithm as bus attachment.
164 */
165 SET_DECLARE(platform_set, platform_def_t);
166
167 void
168 platform_probe_and_attach()
169 {
170 platform_def_t **platpp, *platp;
171 int prio, best_prio;
172
173 plat_obj = &plat_kernel_obj;
174 best_prio = 0;
175
176 /*
177 * Try to locate the best platform kobj
178 */
179 SET_FOREACH(platpp, platform_set) {
180 platp = *platpp;
181
182 /*
183 * Take care of compiling the selected class, and
184 * then statically initialise the MMU object
185 */
186 kobj_class_compile_static(platp, &plat_kernel_kops);
187 kobj_init_static((kobj_t)plat_obj, platp);
188
189 prio = PLATFORM_PROBE(plat_obj);
190
191 /* Check for errors */
192 if (prio > 0)
193 continue;
194
195 /*
196 * Check if this module was specifically requested through
197 * the loader tunable we provide.
198 */
199 if (strcmp(platp->name,plat_name) == 0) {
200 plat_def_impl = platp;
201 break;
202 }
203
204 /* Otherwise, see if it is better than our current best */
205 if (plat_def_impl == NULL || prio > best_prio) {
206 best_prio = prio;
207 plat_def_impl = platp;
208 }
209
210 /*
211 * We can't free the KOBJ, since it is static. Reset the ops
212 * member of this class so that we can come back later.
213 */
214 platp->ops = NULL;
215 }
216
217 if (plat_def_impl == NULL)
218 panic("No platform module found!");
219
220 /*
221 * Recompile to make sure we ended with the
222 * correct one, and then attach.
223 */
224
225 kobj_class_compile_static(plat_def_impl, &plat_kernel_kops);
226 kobj_init_static((kobj_t)plat_obj, plat_def_impl);
227
228 strlcpy(plat_name,plat_def_impl->name,sizeof(plat_name));
229
230 PLATFORM_ATTACH(plat_obj);
231 }
232
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