sys/arm/include/pcpu.h

   1 /*-
   2  * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
  27  * $FreeBSD$
  28  */
  29
  30 #ifndef _MACHINE_PCPU_H_
  31 #define _MACHINE_PCPU_H_
  32
  33 #ifdef _KERNEL
  34
  35 #include <sys/_lock.h>
  36 #include <sys/_mutex.h>
  37
  38 #define ALT_STACK_SIZE  128
  39
  40 struct vmspace;
  41
  42 #endif  /* _KERNEL */
  43
  44 #if __ARM_ARCH >= 6
  45 /* Branch predictor hardening method */
  46 #define PCPU_BP_HARDEN_KIND_NONE                0
  47 #define PCPU_BP_HARDEN_KIND_BPIALL              1
  48 #define PCPU_BP_HARDEN_KIND_ICIALLU             2
  49
  50 #define PCPU_MD_FIELDS                                                  \
  51         unsigned int pc_vfpsid;                                         \
  52         unsigned int pc_vfpmvfr0;                                       \
  53         unsigned int pc_vfpmvfr1;                                       \
  54         struct pmap *pc_curpmap;                                        \
  55         struct mtx pc_cmap_lock;                                        \
  56         void *pc_cmap1_pte2p;                                           \
  57         void *pc_cmap2_pte2p;                                           \
  58         caddr_t pc_cmap1_addr;                                          \
  59         caddr_t pc_cmap2_addr;                                          \
  60         vm_offset_t pc_qmap_addr;                                       \
  61         void *pc_qmap_pte2p;                                            \
  62         unsigned int pc_dbreg[32];                                      \
  63         int pc_dbreg_cmd;                                               \
  64         int pc_bp_harden_kind;                                          \
  65         uint32_t pc_original_actlr;                                     \
  66         char __pad[11]
  67 #else
  68 #define PCPU_MD_FIELDS                                                  \
  69         char __pad[157]
  70 #endif
  71
  72 #ifdef _KERNEL
  73
  74 #define PC_DBREG_CMD_NONE       0
  75 #define PC_DBREG_CMD_LOAD       1
  76
  77 struct pcb;
  78 struct pcpu;
  79
  80 extern struct pcpu *pcpup;
  81
  82 #if __ARM_ARCH >= 6
  83 #define CPU_MASK (0xf)
  84
  85 #ifndef SMP
  86 #define get_pcpu() (pcpup)
  87 #else
  88 #define get_pcpu() __extension__ ({                                     \
  89         int id;                                                         \
  90         __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));      \
  91         (pcpup + (id & CPU_MASK));                                      \
  92     })
  93 #endif
  94
  95 static inline struct thread *
  96 get_curthread(void)
  97 {
  98         void *ret;
  99
 100         __asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
 101         return (ret);
 102 }
 103
 104 static inline void
 105 set_curthread(struct thread *td)
 106 {
 107
 108         __asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
 109 }
 110
 111
 112 static inline void *
 113 get_tls(void)
 114 {
 115         void *tls;
 116
 117         /* TPIDRURW contains the authoritative value. */
 118         __asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
 119         return (tls);
 120 }
 121
 122 static inline void
 123 set_tls(void *tls)
 124 {
 125
 126         /*
 127          * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
 128          * first to ensure that a context switch between the two writes will
 129          * still give the desired result of updating both.
 130          */
 131         __asm __volatile(
 132             "mcr p15, 0, %0, c13, c0, 2\n"
 133             "mcr p15, 0, %0, c13, c0, 3\n"
 134              : : "r" (tls));
 135 }
 136
 137 #define curthread get_curthread()
 138
 139 #else
 140 #define get_pcpu()      pcpup
 141 #endif
 142
 143 #define PCPU_GET(member)        (get_pcpu()->pc_ ## member)
 144 #define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
 145 #define PCPU_INC(member)        PCPU_ADD(member, 1)
 146 #define PCPU_PTR(member)        (&get_pcpu()->pc_ ## member)
 147 #define PCPU_SET(member,value)  (get_pcpu()->pc_ ## member = (value))
 148
 149 void pcpu0_init(void);
 150 #endif  /* _KERNEL */
 151
 152 #endif  /* !_MACHINE_PCPU_H_ */