xref: /freebsd/sys/i386/include/pcpu.h (revision 0957b409a90fd597c1e9124cbaf3edd2b488f4ac)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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  * $FreeBSD$
29  */
30 
31 #ifndef _MACHINE_PCPU_H_
32 #define	_MACHINE_PCPU_H_
33 
34 #ifndef _SYS_CDEFS_H_
35 #error "sys/cdefs.h is a prerequisite for this file"
36 #endif
37 
38 #include <machine/segments.h>
39 #include <machine/tss.h>
40 
41 #include <sys/_lock.h>
42 #include <sys/_mutex.h>
43 
44 /*
45  * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
46  * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
47  * they awake.  The reason for doing it via a struct is so that an
48  * array of pointers to each CPU's data can be set up for things like
49  * "check curproc on all other processors"
50  */
51 
52 #define	PCPU_MD_FIELDS							\
53 	char	pc_monitorbuf[128] __aligned(128); /* cache line */	\
54 	struct	pcpu *pc_prvspace;	/* Self-reference */		\
55 	struct	pmap *pc_curpmap;					\
56 	struct	segment_descriptor pc_common_tssd;			\
57 	struct	segment_descriptor *pc_tss_gdt;				\
58 	struct	segment_descriptor *pc_fsgs_gdt;			\
59 	struct	i386tss *pc_common_tssp;				\
60 	u_int	pc_kesp0;						\
61 	u_int	pc_trampstk;						\
62 	int	pc_currentldt;						\
63 	u_int   pc_acpi_id;		/* ACPI CPU id */		\
64 	u_int	pc_apic_id;						\
65 	int	pc_private_tss;		/* Flag indicating private tss*/\
66 	u_int	pc_cmci_mask;		/* MCx banks for CMCI */	\
67 	u_int	pc_vcpu_id;		/* Xen vCPU ID */		\
68 	struct	mtx pc_cmap_lock;					\
69 	void	*pc_cmap_pte1;						\
70 	void	*pc_cmap_pte2;						\
71 	caddr_t	pc_cmap_addr1;						\
72 	caddr_t	pc_cmap_addr2;						\
73 	vm_offset_t pc_qmap_addr;	/* KVA for temporary mappings */\
74 	vm_offset_t pc_copyout_maddr;					\
75 	vm_offset_t pc_copyout_saddr;					\
76 	struct	mtx pc_copyout_mlock;					\
77 	struct	sx pc_copyout_slock;					\
78 	char	*pc_copyout_buf;					\
79 	vm_offset_t pc_pmap_eh_va;					\
80 	caddr_t pc_pmap_eh_ptep;						\
81 	uint32_t pc_smp_tlb_done;	/* TLB op acknowledgement */	\
82 	uint32_t pc_ibpb_set;						\
83 	char	__pad[3610]
84 
85 #ifdef _KERNEL
86 
87 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
88 
89 /*
90  * Evaluates to the byte offset of the per-cpu variable name.
91  */
92 #define	__pcpu_offset(name)						\
93 	__offsetof(struct pcpu, name)
94 
95 /*
96  * Evaluates to the type of the per-cpu variable name.
97  */
98 #define	__pcpu_type(name)						\
99 	__typeof(((struct pcpu *)0)->name)
100 
101 /*
102  * Evaluates to the address of the per-cpu variable name.
103  */
104 #define	__PCPU_PTR(name) __extension__ ({				\
105 	__pcpu_type(name) *__p;						\
106 									\
107 	__asm __volatile("movl %%fs:%1,%0; addl %2,%0"			\
108 	    : "=r" (__p)						\
109 	    : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),	\
110 	      "i" (__pcpu_offset(name)));				\
111 									\
112 	__p;								\
113 })
114 
115 /*
116  * Evaluates to the value of the per-cpu variable name.
117  */
118 #define	__PCPU_GET(name) __extension__ ({				\
119 	__pcpu_type(name) __res;					\
120 	struct __s {							\
121 		u_char	__b[MIN(sizeof(__res), 4)];			\
122 	} __s;								\
123 									\
124 	if (sizeof(__res) == 1 || sizeof(__res) == 2 ||			\
125 	    sizeof(__res) == 4) {					\
126 		__asm __volatile("mov %%fs:%1,%0"			\
127 		    : "=r" (__s)					\
128 		    : "m" (*(struct __s *)(__pcpu_offset(name))));	\
129 		*(struct __s *)(void *)&__res = __s;			\
130 	} else {							\
131 		__res = *__PCPU_PTR(name);				\
132 	}								\
133 	__res;								\
134 })
135 
136 /*
137  * Adds a value of the per-cpu counter name.  The implementation
138  * must be atomic with respect to interrupts.
139  */
140 #define	__PCPU_ADD(name, val) do {					\
141 	__pcpu_type(name) __val;					\
142 	struct __s {							\
143 		u_char	__b[MIN(sizeof(__val), 4)];			\
144 	} __s;								\
145 									\
146 	__val = (val);							\
147 	if (sizeof(__val) == 1 || sizeof(__val) == 2 ||			\
148 	    sizeof(__val) == 4) {					\
149 		__s = *(struct __s *)(void *)&__val;			\
150 		__asm __volatile("add %1,%%fs:%0"			\
151 		    : "=m" (*(struct __s *)(__pcpu_offset(name)))	\
152 		    : "r" (__s));					\
153 	} else								\
154 		*__PCPU_PTR(name) += __val;				\
155 } while (0)
156 
157 /*
158  * Increments the value of the per-cpu counter name.  The implementation
159  * must be atomic with respect to interrupts.
160  */
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 	if (sizeof(__pcpu_type(name)) == 1) {				\
166 		__asm __volatile("incb %%fs:%0"				\
167 		    : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
168 		    : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
169 	} else if (sizeof(__pcpu_type(name)) == 2) {			\
170 		__asm __volatile("incw %%fs:%0"				\
171 		    : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
172 		    : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
173 	} else if (sizeof(__pcpu_type(name)) == 4) {			\
174 		__asm __volatile("incl %%fs:%0"				\
175 		    : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
176 		    : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
177 	}								\
178 } while (0)
179 
180 /*
181  * Sets the value of the per-cpu variable name to value val.
182  */
183 #define	__PCPU_SET(name, val) do {					\
184 	__pcpu_type(name) __val;					\
185 	struct __s {							\
186 		u_char	__b[MIN(sizeof(__val), 4)];			\
187 	} __s;								\
188 									\
189 	__val = (val);							\
190 	if (sizeof(__val) == 1 || sizeof(__val) == 2 ||			\
191 	    sizeof(__val) == 4) {					\
192 		__s = *(struct __s *)(void *)&__val;			\
193 		__asm __volatile("mov %1,%%fs:%0"			\
194 		    : "=m" (*(struct __s *)(__pcpu_offset(name)))	\
195 		    : "r" (__s));					\
196 	} else {							\
197 		*__PCPU_PTR(name) = __val;				\
198 	}								\
199 } while (0)
200 
201 #define	get_pcpu() __extension__ ({					\
202 	struct pcpu *__pc;						\
203 									\
204 	__asm __volatile("movl %%fs:%1,%0"				\
205 	    : "=r" (__pc)						\
206 	    : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));	\
207 	__pc;								\
208 })
209 
210 #define	PCPU_GET(member)	__PCPU_GET(pc_ ## member)
211 #define	PCPU_ADD(member, val)	__PCPU_ADD(pc_ ## member, val)
212 #define	PCPU_INC(member)	__PCPU_INC(pc_ ## member)
213 #define	PCPU_PTR(member)	__PCPU_PTR(pc_ ## member)
214 #define	PCPU_SET(member, val)	__PCPU_SET(pc_ ## member, val)
215 
216 #define	OFFSETOF_CURTHREAD	0
217 #ifdef __clang__
218 #pragma clang diagnostic push
219 #pragma clang diagnostic ignored "-Wnull-dereference"
220 #endif
221 static __inline __pure2 struct thread *
222 __curthread(void)
223 {
224 	struct thread *td;
225 
226 	__asm("movl %%fs:%1,%0" : "=r" (td)
227 	    : "m" (*(char *)OFFSETOF_CURTHREAD));
228 	return (td);
229 }
230 #ifdef __clang__
231 #pragma clang diagnostic pop
232 #endif
233 #define	curthread		(__curthread())
234 
235 #define	OFFSETOF_CURPCB		16
236 static __inline __pure2 struct pcb *
237 __curpcb(void)
238 {
239 	struct pcb *pcb;
240 
241 	__asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
242 	return (pcb);
243 }
244 #define	curpcb		(__curpcb())
245 
246 #define	IS_BSP()	(PCPU_GET(cpuid) == 0)
247 
248 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
249 
250 #error "this file needs to be ported to your compiler"
251 
252 #endif /* __GNUCLIKE_ASM etc. */
253 
254 #endif /* _KERNEL */
255 
256 #endif /* !_MACHINE_PCPU_H_ */
257