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
41 int idle_state; /* Used by cpu_idle_mwait. */
42 int stop_state; /* Used by cpustop_handler. */
43 char padding[128 - (2 * sizeof(int))];
45 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
48 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
49 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
50 * The reason for doing it via a struct is so that an array of pointers
51 * to each CPU's data can be set up for things like "check curproc on all
54 #define PCPU_MD_FIELDS \
55 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
56 struct pcpu *pc_prvspace; /* Self-reference */ \
57 struct pmap *pc_curpmap; \
58 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \
59 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \
62 uint64_t pc_saved_ucr3; \
64 register_t pc_scratch_rsp; /* User %rsp in syscall */ \
65 register_t pc_scratch_rax; \
67 u_int pc_acpi_id; /* ACPI CPU id */ \
68 /* Pointer to the CPU %fs descriptor */ \
69 struct user_segment_descriptor *pc_fs32p; \
70 /* Pointer to the CPU %gs descriptor */ \
71 struct user_segment_descriptor *pc_gs32p; \
72 /* Pointer to the CPU LDT descriptor */ \
73 struct system_segment_descriptor *pc_ldt; \
74 /* Pointer to the CPU TSS descriptor */ \
75 struct system_segment_descriptor *pc_tss; \
76 uint64_t pc_pm_save_cnt; \
77 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
78 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \
79 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \
80 register_t pc_pti_rsp0; \
81 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \
82 u_int pc_vcpu_id; /* Xen vCPU ID */ \
83 uint32_t pc_pcid_next; \
84 uint32_t pc_pcid_gen; \
85 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
86 uint32_t pc_ibpb_set; \
87 char __pad[3288] /* pad to UMA_PCPU_ALLOC_SIZE */
89 #define PC_DBREG_CMD_NONE 0
90 #define PC_DBREG_CMD_LOAD 1
94 #define MONITOR_STOPSTATE_RUNNING 0
95 #define MONITOR_STOPSTATE_STOPPED 1
97 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
100 * Evaluates to the byte offset of the per-cpu variable name.
102 #define __pcpu_offset(name) \
103 __offsetof(struct pcpu, name)
106 * Evaluates to the type of the per-cpu variable name.
108 #define __pcpu_type(name) \
109 __typeof(((struct pcpu *)0)->name)
112 * Evaluates to the address of the per-cpu variable name.
114 #define __PCPU_PTR(name) __extension__ ({ \
115 __pcpu_type(name) *__p; \
117 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \
119 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
120 "i" (__pcpu_offset(name))); \
126 * Evaluates to the value of the per-cpu variable name.
128 #define __PCPU_GET(name) __extension__ ({ \
129 __pcpu_type(name) __res; \
131 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
134 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
135 sizeof(__res) == 4 || sizeof(__res) == 8) { \
136 __asm __volatile("mov %%gs:%1,%0" \
138 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
139 *(struct __s *)(void *)&__res = __s; \
141 __res = *__PCPU_PTR(name); \
147 * Adds the value to the per-cpu counter name. The implementation
148 * must be atomic with respect to interrupts.
150 #define __PCPU_ADD(name, val) do { \
151 __pcpu_type(name) __val; \
153 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
157 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
158 sizeof(__val) == 4 || sizeof(__val) == 8) { \
159 __s = *(struct __s *)(void *)&__val; \
160 __asm __volatile("add %1,%%gs:%0" \
161 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
164 *__PCPU_PTR(name) += __val; \
168 * Increments the value of the per-cpu counter name. The implementation
169 * must be atomic with respect to interrupts.
171 #define __PCPU_INC(name) do { \
172 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
173 sizeof(__pcpu_type(name)) == 2 || \
174 sizeof(__pcpu_type(name)) == 4 || \
175 sizeof(__pcpu_type(name)) == 8); \
176 if (sizeof(__pcpu_type(name)) == 1) { \
177 __asm __volatile("incb %%gs:%0" \
178 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
179 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
180 } else if (sizeof(__pcpu_type(name)) == 2) { \
181 __asm __volatile("incw %%gs:%0" \
182 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
183 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
184 } else if (sizeof(__pcpu_type(name)) == 4) { \
185 __asm __volatile("incl %%gs:%0" \
186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
188 } else if (sizeof(__pcpu_type(name)) == 8) { \
189 __asm __volatile("incq %%gs:%0" \
190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
196 * Sets the value of the per-cpu variable name to value val.
198 #define __PCPU_SET(name, val) { \
199 __pcpu_type(name) __val; \
201 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
205 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
206 sizeof(__val) == 4 || sizeof(__val) == 8) { \
207 __s = *(struct __s *)(void *)&__val; \
208 __asm __volatile("mov %1,%%gs:%0" \
209 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
212 *__PCPU_PTR(name) = __val; \
216 #define get_pcpu() __extension__ ({ \
219 __asm __volatile("movq %%gs:%1,%0" \
221 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
225 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
226 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
227 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
228 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
229 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
231 #define OFFSETOF_CURTHREAD 0
233 #pragma clang diagnostic push
234 #pragma clang diagnostic ignored "-Wnull-dereference"
236 static __inline __pure2 struct thread *
241 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (OFFSETOF_CURTHREAD));
245 #pragma clang diagnostic pop
247 #define curthread (__curthread())
249 #define OFFSETOF_CURPCB 32
250 static __inline __pure2 struct pcb *
255 __asm("movq %%gs:%P1,%0" : "=r" (pcb) : "n" (OFFSETOF_CURPCB));
258 #define curpcb (__curpcb())
260 #define IS_BSP() (PCPU_GET(cpuid) == 0)
262 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */
264 #error "this file needs to be ported to your compiler"
266 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */
270 #endif /* !_MACHINE_PCPU_H_ */