1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) Peter Wemm
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _MACHINE_PCPU_H_
30#define _MACHINE_PCPU_H_
31
32#include <machine/segments.h>
33#include <machine/tss.h>
34
35#include <sys/_lock.h>
36#include <sys/_mutex.h>
37
38struct monitorbuf {
39 int idle_state; /* Used by cpu_idle_mwait. */
40 int stop_state; /* Used by cpustop_handler. */
41 char padding[128 - (2 * sizeof(int))];
42};
43_Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
44
45/*
46 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
47 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
48 * they awake. The reason for doing it via a struct is so that an
49 * array of pointers to each CPU's data can be set up for things like
50 * "check curproc on all other processors"
51 */
52
53#define PCPU_MD_FIELDS \
54 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
55 struct pcpu *pc_prvspace; /* Self-reference */ \
56 struct pmap *pc_curpmap; \
57 struct segment_descriptor pc_common_tssd; \
58 struct segment_descriptor *pc_tss_gdt; \
59 struct segment_descriptor *pc_fsgs_gdt; \
60 struct i386tss *pc_common_tssp; \
61 u_int pc_kesp0; \
62 u_int pc_trampstk; \
63 int pc_currentldt; \
64 u_int pc_acpi_id; /* ACPI CPU id */ \
65 u_int pc_apic_id; \
66 int pc_private_tss; /* Flag indicating private tss*/\
67 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
68 u_int pc_vcpu_id; /* Xen vCPU ID */ \
69 struct mtx pc_cmap_lock; \
70 void *pc_cmap_pte1; \
71 void *pc_cmap_pte2; \
72 caddr_t pc_cmap_addr1; \
73 caddr_t pc_cmap_addr2; \
74 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
75 vm_offset_t pc_copyout_maddr; \
76 vm_offset_t pc_copyout_saddr; \
77 struct mtx pc_copyout_mlock; \
78 struct sx pc_copyout_slock; \
79 char *pc_copyout_buf; \
80 vm_offset_t pc_pmap_eh_va; \
81 caddr_t pc_pmap_eh_ptep; \
82 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
83 uint32_t pc_ibpb_set; \
84 void *pc_mds_buf; \
85 void *pc_mds_buf64; \
86 uint32_t pc_pad[4]; \
87 uint8_t pc_mds_tmp[64]; \
88 u_int pc_ipi_bitmap; \
89 char __pad[3518]
90
91#ifdef _KERNEL
92
93#define MONITOR_STOPSTATE_RUNNING 0
94#define MONITOR_STOPSTATE_STOPPED 1
95
96/*
97 * Evaluates to the byte offset of the per-cpu variable name.
98 */
99#define __pcpu_offset(name) \
100 __offsetof(struct pcpu, name)
101
102/*
103 * Evaluates to the type of the per-cpu variable name.
104 */
105#define __pcpu_type(name) \
106 __typeof(((struct pcpu *)0)->name)
107
108/*
109 * Evaluates to the address of the per-cpu variable name.
110 */
111#define __PCPU_PTR(name) \
112 (&get_pcpu()->name)
113
114/*
115 * Evaluates to the value of the per-cpu variable name.
116 */
117#define __PCPU_GET(name) __extension__ ({ \
118 __pcpu_type(name) __res; \
119 struct __s { \
120 u_char __b[MIN(sizeof(__res), 4)]; \
121 }; \
122 \
123 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
124 sizeof(__res) == 4) { \
125 __asm __volatile("mov %%fs:%c1,%0" \
126 : "=r" (*(struct __s *)(void *)&__res) \
127 : "i" (__pcpu_offset(name))); \
128 } else { \
129 __res = *__PCPU_PTR(name); \
130 } \
131 __res; \
132})
133
134/*
135 * Adds a value of the per-cpu counter name. The implementation
136 * must be atomic with respect to interrupts.
137 */
138#define __PCPU_ADD(name, val) do { \
139 __pcpu_type(name) __val; \
140 struct __s { \
141 u_char __b[MIN(sizeof(__val), 4)]; \
142 }; \
143 \
144 __val = (val); \
145 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
146 sizeof(__val) == 4) { \
147 __asm __volatile("add %1,%%fs:%c0" \
148 : \
149 : "i" (__pcpu_offset(name)), \
150 "r" (*(struct __s *)(void *)&__val) \
151 : "cc", "memory"); \
152 } else \
153 *__PCPU_PTR(name) += __val; \
154} while (0)
155
156/*
157 * Sets the value of the per-cpu variable name to value val.
158 */
159#define __PCPU_SET(name, val) do { \
160 __pcpu_type(name) __val; \
161 struct __s { \
162 u_char __b[MIN(sizeof(__val), 4)]; \
163 }; \
164 \
165 __val = (val); \
166 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
167 sizeof(__val) == 4) { \
168 __asm __volatile("mov %1,%%fs:%c0" \
169 : \
170 : "i" (__pcpu_offset(name)), \
171 "r" (*(struct __s *)(void *)&__val) \
172 : "memory"); \
173 } else { \
174 *__PCPU_PTR(name) = __val; \
175 } \
176} while (0)
177
178#define get_pcpu() __extension__ ({ \
179 struct pcpu *__pc; \
180 \
181 __asm __volatile("movl %%fs:%c1,%0" \
182 : "=r" (__pc) \
183 : "i" (__pcpu_offset(pc_prvspace))); \
184 __pc; \
185})
186
187#define PCPU_GET(member) __PCPU_GET(pc_ ## member)
188#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
189#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
190#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
191
192#define IS_BSP() (PCPU_GET(cpuid) == 0)
193
194#endif /* _KERNEL */
195
196#endif /* !_MACHINE_PCPU_H_ */