2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) Peter Wemm <peter@netplex.com.au>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 #ifndef _MACHINE_PCPU_H_
32 #define _MACHINE_PCPU_H_
35 #error "sys/cdefs.h is a prerequisite for this file"
38 #define PC_PTI_STACK_SZ 16
40 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
41 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
42 * The reason for doing it via a struct is so that an array of pointers
43 * to each CPU's data can be set up for things like "check curproc on all
46 #define PCPU_MD_FIELDS \
47 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
48 struct pcpu *pc_prvspace; /* Self-reference */ \
49 struct pmap *pc_curpmap; \
50 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \
51 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \
54 uint64_t pc_saved_ucr3; \
56 register_t pc_scratch_rsp; /* User %rsp in syscall */ \
57 register_t pc_scratch_rax; \
59 u_int pc_acpi_id; /* ACPI CPU id */ \
60 /* Pointer to the CPU %fs descriptor */ \
61 struct user_segment_descriptor *pc_fs32p; \
62 /* Pointer to the CPU %gs descriptor */ \
63 struct user_segment_descriptor *pc_gs32p; \
64 /* Pointer to the CPU LDT descriptor */ \
65 struct system_segment_descriptor *pc_ldt; \
66 /* Pointer to the CPU TSS descriptor */ \
67 struct system_segment_descriptor *pc_tss; \
68 uint64_t pc_pm_save_cnt; \
69 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
70 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \
71 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \
72 register_t pc_pti_rsp0; \
73 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \
74 u_int pc_vcpu_id; /* Xen vCPU ID */ \
75 uint32_t pc_pcid_next; \
76 uint32_t pc_pcid_gen; \
77 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
78 uint32_t pc_ibpb_set; \
79 char __pad[216] /* be divisor of PAGE_SIZE \
80 after cache alignment */
82 #define PC_DBREG_CMD_NONE 0
83 #define PC_DBREG_CMD_LOAD 1
87 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
90 * Evaluates to the byte offset of the per-cpu variable name.
92 #define __pcpu_offset(name) \
93 __offsetof(struct pcpu, name)
96 * Evaluates to the type of the per-cpu variable name.
98 #define __pcpu_type(name) \
99 __typeof(((struct pcpu *)0)->name)
102 * Evaluates to the address of the per-cpu variable name.
104 #define __PCPU_PTR(name) __extension__ ({ \
105 __pcpu_type(name) *__p; \
107 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \
109 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
110 "i" (__pcpu_offset(name))); \
116 * Evaluates to the value of the per-cpu variable name.
118 #define __PCPU_GET(name) __extension__ ({ \
119 __pcpu_type(name) __res; \
121 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
124 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
125 sizeof(__res) == 4 || sizeof(__res) == 8) { \
126 __asm __volatile("mov %%gs:%1,%0" \
128 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
129 *(struct __s *)(void *)&__res = __s; \
131 __res = *__PCPU_PTR(name); \
137 * Adds the value to the per-cpu counter name. The implementation
138 * must be atomic with respect to interrupts.
140 #define __PCPU_ADD(name, val) do { \
141 __pcpu_type(name) __val; \
143 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
147 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
148 sizeof(__val) == 4 || sizeof(__val) == 8) { \
149 __s = *(struct __s *)(void *)&__val; \
150 __asm __volatile("add %1,%%gs:%0" \
151 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
154 *__PCPU_PTR(name) += __val; \
158 * Increments the value of the per-cpu counter name. The implementation
159 * must be atomic with respect to interrupts.
161 #define __PCPU_INC(name) do { \
162 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
163 sizeof(__pcpu_type(name)) == 2 || \
164 sizeof(__pcpu_type(name)) == 4 || \
165 sizeof(__pcpu_type(name)) == 8); \
166 if (sizeof(__pcpu_type(name)) == 1) { \
167 __asm __volatile("incb %%gs:%0" \
168 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
169 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
170 } else if (sizeof(__pcpu_type(name)) == 2) { \
171 __asm __volatile("incw %%gs:%0" \
172 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
173 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
174 } else if (sizeof(__pcpu_type(name)) == 4) { \
175 __asm __volatile("incl %%gs:%0" \
176 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
177 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
178 } else if (sizeof(__pcpu_type(name)) == 8) { \
179 __asm __volatile("incq %%gs:%0" \
180 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
181 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
186 * Sets the value of the per-cpu variable name to value val.
188 #define __PCPU_SET(name, val) { \
189 __pcpu_type(name) __val; \
191 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
195 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
196 sizeof(__val) == 4 || sizeof(__val) == 8) { \
197 __s = *(struct __s *)(void *)&__val; \
198 __asm __volatile("mov %1,%%gs:%0" \
199 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
202 *__PCPU_PTR(name) = __val; \
206 #define get_pcpu() __extension__ ({ \
209 __asm __volatile("movq %%gs:%1,%0" \
211 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
215 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
216 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
217 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
218 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
219 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
221 #define OFFSETOF_CURTHREAD 0
223 #pragma clang diagnostic push
224 #pragma clang diagnostic ignored "-Wnull-dereference"
226 static __inline __pure2 struct thread *
231 __asm("movq %%gs:%1,%0" : "=r" (td)
232 : "m" (*(char *)OFFSETOF_CURTHREAD));
236 #pragma clang diagnostic pop
238 #define curthread (__curthread())
240 #define OFFSETOF_CURPCB 32
241 static __inline __pure2 struct pcb *
246 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
249 #define curpcb (__curpcb())
251 #define IS_BSP() (PCPU_GET(cpuid) == 0)
253 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */
255 #error "this file needs to be ported to your compiler"
257 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */
261 #endif /* !_MACHINE_PCPU_H_ */