1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * Kernel/Debugger Interface (KDI) routines. Called during debugger under
28 * various system states (boot, while running, while the debugger has control).
29 * Functions intended for use while the debugger has control may not grab any
30 * locks or perform any functions that assume the availability of other system
31 * services.
32 */
33
34 #include <sys/systm.h>
35 #include <sys/x86_archext.h>
36 #include <sys/kdi_impl.h>
37 #include <sys/smp_impldefs.h>
38 #include <sys/psm_types.h>
39 #include <sys/segments.h>
40 #include <sys/archsystm.h>
41 #include <sys/controlregs.h>
42 #include <sys/trap.h>
43 #include <sys/kobj.h>
44 #include <sys/kobj_impl.h>
45 #include <sys/clock_impl.h>
46
47 static void
48 kdi_system_claim(void)
49 {
50 lbolt_debug_entry();
51
52 psm_notifyf(PSM_DEBUG_ENTER);
53 }
54
55 static void
56 kdi_system_release(void)
57 {
58 psm_notifyf(PSM_DEBUG_EXIT);
59
60 lbolt_debug_return();
61 }
62
63 static cpu_t *
64 kdi_gdt2cpu(uintptr_t gdtbase)
65 {
66 cpu_t *cp = cpu_list;
67
68 if (cp == NULL)
69 return (NULL);
70
71 do {
72 if (gdtbase == (uintptr_t)cp->cpu_gdt)
73 return (cp);
74 } while ((cp = cp->cpu_next) != cpu_list);
75
76 return (NULL);
77 }
78
79 #if defined(__amd64)
80 uintptr_t
81 kdi_gdt2gsbase(uintptr_t gdtbase)
82 {
83 return ((uintptr_t)kdi_gdt2cpu(gdtbase));
84 }
85 #endif
86
87 static uintptr_t
88 kdi_get_userlimit(void)
89 {
90 return (_userlimit);
91 }
92
93 static int
94 kdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp)
95 {
96 desctbr_t gdtr;
97 cpu_t *cpu;
98
99 /*
100 * CPU doesn't work until the GDT and gs/GSBASE have been set up.
101 * Boot-loaded kmdb will call us well before then, so we have to
102 * find the current cpu_t the hard way.
103 */
104 rd_gdtr(&gdtr);
105 if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL ||
106 !cpuid_checkpass(cpu, 1))
107 return (EAGAIN); /* cpuid isn't done yet */
108
109 *vendorp = cpuid_getvendor(cpu);
110 *familyp = cpuid_getfamily(cpu);
111 *modelp = cpuid_getmodel(cpu);
112
113 return (0);
114 }
115
116 void
117 kdi_idtr_set(gate_desc_t *idt, size_t limit)
118 {
119 desctbr_t idtr;
120
121 /*
122 * This rare case could happen if we entered kmdb whilst still on the
123 * fake CPU set up by boot_kdi_tmpinit(). We're trying to restore the
124 * kernel's IDT that we saved on entry, but it was from the fake cpu_t
125 * rather than the real IDT (which is still boot's). It's unpleasant,
126 * but we just encode knowledge that it's idt0 we want to restore.
127 */
128 if (idt == NULL)
129 idt = idt0;
130
131 CPU->cpu_m.mcpu_idt = idt;
132 idtr.dtr_base = (uintptr_t)idt;
133 idtr.dtr_limit = limit;
134 kdi_idtr_write(&idtr);
135 }
136
137 static void
138 kdi_plat_call(void (*platfn)(void))
139 {
140 if (platfn != NULL)
141 platfn();
142 }
143
144 /*
145 * On Intel, most of these are shared between i86*, so this is really an
146 * arch_kdi_init().
147 */
148 void
149 mach_kdi_init(kdi_t *kdi)
150 {
151 kdi->kdi_plat_call = kdi_plat_call;
152 kdi->kdi_kmdb_enter = kmdb_enter;
153 kdi->mkdi_activate = kdi_activate;
154 kdi->mkdi_deactivate = kdi_deactivate;
155 kdi->mkdi_idt_switch = kdi_idt_switch;
156 kdi->mkdi_update_drreg = kdi_update_drreg;
157 kdi->mkdi_set_debug_msrs = kdi_set_debug_msrs;
158 kdi->mkdi_get_userlimit = kdi_get_userlimit;
159 kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo;
160 kdi->mkdi_stop_slaves = kdi_stop_slaves;
161 kdi->mkdi_start_slaves = kdi_start_slaves;
162 kdi->mkdi_slave_wait = kdi_slave_wait;
163 kdi->mkdi_memrange_add = kdi_memrange_add;
164 kdi->mkdi_reboot = kdi_reboot;
165 }
166
167 void
168 plat_kdi_init(kdi_t *kdi)
169 {
170 kdi->pkdi_system_claim = kdi_system_claim;
171 kdi->pkdi_system_release = kdi_system_release;
172 }