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 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Copyright 2018 Joyent, Inc.
26 */
27
28/*
29 * Kernel/Debugger Interface (KDI) routines.  Called during debugger under
30 * various system states (boot, while running, while the debugger has control).
31 * Functions intended for use while the debugger has control may not grab any
32 * locks or perform any functions that assume the availability of other system
33 * services.
34 */
35
36#include <sys/systm.h>
37#include <sys/x86_archext.h>
38#include <sys/kdi_impl.h>
39#include <sys/smp_impldefs.h>
40#include <sys/psm_types.h>
41#include <sys/segments.h>
42#include <sys/archsystm.h>
43#include <sys/controlregs.h>
44#include <sys/trap.h>
45#include <sys/kobj.h>
46#include <sys/kobj_impl.h>
47#include <sys/mach_mmu.h>
48
49void
50kdi_idt_write(gate_desc_t *gate, uint_t vec)
51{
52	gate_desc_t *idt = CPU->cpu_m.mcpu_idt;
53
54	/*
55	 * See kdi_idtr_set().
56	 */
57	if (idt == NULL) {
58		desctbr_t idtr;
59		rd_idtr(&idtr);
60		idt = (gate_desc_t *)idtr.dtr_base;
61	}
62
63	idt[vec] = *gate;
64}
65
66ulong_t
67kdi_dreg_get(int reg)
68{
69	switch (reg) {
70	case 0:
71		return (kdi_getdr0());
72	case 1:
73		return (kdi_getdr1());
74	case 2:
75		return (kdi_getdr2());
76	case 3:
77		return (kdi_getdr3());
78	case 6:
79		return (kdi_getdr6());
80	case 7:
81		return (kdi_getdr7());
82	default:
83		panic("invalid debug register dr%d", reg);
84		/*NOTREACHED*/
85	}
86}
87
88void
89kdi_dreg_set(int reg, ulong_t value)
90{
91	switch (reg) {
92	case 0:
93		kdi_setdr0(value);
94		break;
95	case 1:
96		kdi_setdr1(value);
97		break;
98	case 2:
99		kdi_setdr2(value);
100		break;
101	case 3:
102		kdi_setdr3(value);
103		break;
104	case 6:
105		kdi_setdr6(value);
106		break;
107	case 7:
108		kdi_setdr7(value);
109		break;
110	default:
111		panic("invalid debug register dr%d", reg);
112		/*NOTREACHED*/
113	}
114}
115
116extern void kdi_slave_entry(void);
117
118void
119kdi_stop_slaves(int cpu, int doxc)
120{
121	if (doxc)
122		kdi_xc_others(cpu, kdi_slave_entry);
123}
124
125/*
126 * On i86pc, slaves busy-loop, so we don't need to do anything here.
127 */
128void
129kdi_start_slaves(void)
130{
131}
132
133void
134kdi_slave_wait(void)
135{
136}
137
138/*
139 * Caution.
140 * These routines are called -extremely- early, during kmdb initialization.
141 *
142 * Many common kernel functions assume that %gs has been initialized,
143 * and fail horribly if it hasn't.  At this point, the boot code has
144 * reserved a descriptor for us (KMDBGS_SEL) in it's GDT; arrange for it
145 * to point at a dummy cpu_t, temporarily at least.
146 *
147 * Note that kmdb entry relies on the fake cpu_t having zero cpu_idt/cpu_id.
148 */
149
150#if defined(__amd64)
151
152void *
153boot_kdi_tmpinit(void)
154{
155	cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
156	uintptr_t old;
157
158	cpu->cpu_self = cpu;
159
160	old = (uintptr_t)rdmsr(MSR_AMD_GSBASE);
161	wrmsr(MSR_AMD_GSBASE, (uint64_t)cpu);
162	return ((void *)old);
163}
164
165void
166boot_kdi_tmpfini(void *old)
167{
168	wrmsr(MSR_AMD_GSBASE, (uint64_t)old);
169}
170
171#elif defined(__i386)
172
173void *
174boot_kdi_tmpinit(void)
175{
176	cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
177	uintptr_t old;
178	desctbr_t b_gdtr;
179	user_desc_t *bgdt;
180
181	cpu->cpu_self = cpu;
182
183	rd_gdtr(&b_gdtr);
184	bgdt = (user_desc_t *)(b_gdtr.dtr_base);
185
186	set_usegd(&bgdt[GDT_BGSTMP],
187	    cpu, sizeof (*cpu), SDT_MEMRWA, SEL_KPL, SDP_BYTES, SDP_OP32);
188
189	/*
190	 * Now switch %gs to point at it.
191	 */
192	old = getgs();
193	setgs(KMDBGS_SEL);
194
195	return ((void *)old);
196}
197
198void
199boot_kdi_tmpfini(void *old)
200{
201	setgs((uintptr_t)old);
202}
203
204#endif	/* __i386 */
205