sys/arm/include/pcpu.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
   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  *      from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
  29  * $FreeBSD$
  30  */
  31
  32 #ifndef _MACHINE_PCPU_H_
  33 #define _MACHINE_PCPU_H_
  34
  35 #ifdef _KERNEL
  36
  37 #include <sys/_lock.h>
  38 #include <sys/_mutex.h>
  39
  40 #define ALT_STACK_SIZE  128
  41
  42 struct vmspace;
  43
  44 #endif  /* _KERNEL */
  45
  46 #if __ARM_ARCH >= 6
  47 /* Branch predictor hardening method */
  48 #define PCPU_BP_HARDEN_KIND_NONE                0
  49 #define PCPU_BP_HARDEN_KIND_BPIALL              1
  50 #define PCPU_BP_HARDEN_KIND_ICIALLU             2
  51
  52 #define PCPU_MD_FIELDS                                                  \
  53         unsigned int pc_vfpsid;                                         \
  54         unsigned int pc_vfpmvfr0;                                       \
  55         unsigned int pc_vfpmvfr1;                                       \
  56         struct pmap *pc_curpmap;                                        \
  57         struct mtx pc_cmap_lock;                                        \
  58         void *pc_cmap1_pte2p;                                           \
  59         void *pc_cmap2_pte2p;                                           \
  60         caddr_t pc_cmap1_addr;                                          \
  61         caddr_t pc_cmap2_addr;                                          \
  62         vm_offset_t pc_qmap_addr;                                       \
  63         void *pc_qmap_pte2p;                                            \
  64         unsigned int pc_dbreg[32];                                      \
  65         int pc_dbreg_cmd;                                               \
  66         int pc_bp_harden_kind;                                          \
  67         uint32_t pc_original_actlr;                                     \
  68         char __pad[147]
  69 #else
  70 #define PCPU_MD_FIELDS                                                  \
  71         char __pad[93]
  72 #endif
  73
  74 #ifdef _KERNEL
  75
  76 #define PC_DBREG_CMD_NONE       0
  77 #define PC_DBREG_CMD_LOAD       1
  78
  79 struct pcb;
  80 struct pcpu;
  81
  82 extern struct pcpu *pcpup;
  83
  84 #if __ARM_ARCH >= 6
  85 #define CPU_MASK (0xf)
  86
  87 #ifndef SMP
  88 #define get_pcpu() (pcpup)
  89 #else
  90 #define get_pcpu() __extension__ ({                                     \
  91         int id;                                                         \
  92         __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));      \
  93         (pcpup + (id & CPU_MASK));                                      \
  94     })
  95 #endif
  96
  97 static inline struct thread *
  98 get_curthread(void)
  99 {
 100         void *ret;
 101
 102         __asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
 103         return (ret);
 104 }
 105
 106 static inline void
 107 set_curthread(struct thread *td)
 108 {
 109
 110         __asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
 111 }
 112
 113
 114 static inline void *
 115 get_tls(void)
 116 {
 117         void *tls;
 118
 119         /* TPIDRURW contains the authoritative value. */
 120         __asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
 121         return (tls);
 122 }
 123
 124 static inline void
 125 set_tls(void *tls)
 126 {
 127
 128         /*
 129          * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
 130          * first to ensure that a context switch between the two writes will
 131          * still give the desired result of updating both.
 132          */
 133         __asm __volatile(
 134             "mcr p15, 0, %0, c13, c0, 2\n"
 135             "mcr p15, 0, %0, c13, c0, 3\n"
 136              : : "r" (tls));
 137 }
 138
 139 #define curthread get_curthread()
 140
 141 #else
 142 #define get_pcpu()      pcpup
 143 #endif
 144
 145 #define PCPU_GET(member)        (get_pcpu()->pc_ ## member)
 146 #define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
 147 #define PCPU_INC(member)        PCPU_ADD(member, 1)
 148 #define PCPU_PTR(member)        (&get_pcpu()->pc_ ## member)
 149 #define PCPU_SET(member,value)  (get_pcpu()->pc_ ## member = (value))
 150
 151 void pcpu0_init(void);
 152 #endif  /* _KERNEL */
 153
 154 #endif  /* !_MACHINE_PCPU_H_ */