arch/riscv/include/asm/csr.h

   1 /*
   2  * Copyright (C) 2015 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #ifndef _ASM_RISCV_CSR_H
  15 #define _ASM_RISCV_CSR_H
  16
  17 #include <linux/const.h>
  18
  19 /* Status register flags */
  20 #define SR_SIE  _AC(0x00000002, UL) /* Supervisor Interrupt Enable */
  21 #define SR_SPIE _AC(0x00000020, UL) /* Previous Supervisor IE */
  22 #define SR_SPP  _AC(0x00000100, UL) /* Previously Supervisor */
  23 #define SR_SUM  _AC(0x00040000, UL) /* Supervisor may access User Memory */
  24
  25 #define SR_FS           _AC(0x00006000, UL) /* Floating-point Status */
  26 #define SR_FS_OFF       _AC(0x00000000, UL)
  27 #define SR_FS_INITIAL   _AC(0x00002000, UL)
  28 #define SR_FS_CLEAN     _AC(0x00004000, UL)
  29 #define SR_FS_DIRTY     _AC(0x00006000, UL)
  30
  31 #define SR_XS           _AC(0x00018000, UL) /* Extension Status */
  32 #define SR_XS_OFF       _AC(0x00000000, UL)
  33 #define SR_XS_INITIAL   _AC(0x00008000, UL)
  34 #define SR_XS_CLEAN     _AC(0x00010000, UL)
  35 #define SR_XS_DIRTY     _AC(0x00018000, UL)
  36
  37 #ifndef CONFIG_64BIT
  38 #define SR_SD   _AC(0x80000000, UL) /* FS/XS dirty */
  39 #else
  40 #define SR_SD   _AC(0x8000000000000000, UL) /* FS/XS dirty */
  41 #endif
  42
  43 /* SATP flags */
  44 #if __riscv_xlen == 32
  45 #define SATP_PPN     _AC(0x003FFFFF, UL)
  46 #define SATP_MODE_32 _AC(0x80000000, UL)
  47 #define SATP_MODE    SATP_MODE_32
  48 #else
  49 #define SATP_PPN     _AC(0x00000FFFFFFFFFFF, UL)
  50 #define SATP_MODE_39 _AC(0x8000000000000000, UL)
  51 #define SATP_MODE    SATP_MODE_39
  52 #endif
  53
  54 /* Interrupt Enable and Interrupt Pending flags */
  55 #define SIE_SSIE _AC(0x00000002, UL) /* Software Interrupt Enable */
  56 #define SIE_STIE _AC(0x00000020, UL) /* Timer Interrupt Enable */
  57 #define SIE_SEIE _AC(0x00000200, UL) /* External Interrupt Enable */
  58
  59 #define EXC_INST_MISALIGNED     0
  60 #define EXC_INST_ACCESS         1
  61 #define EXC_BREAKPOINT          3
  62 #define EXC_LOAD_ACCESS         5
  63 #define EXC_STORE_ACCESS        7
  64 #define EXC_SYSCALL             8
  65 #define EXC_INST_PAGE_FAULT     12
  66 #define EXC_LOAD_PAGE_FAULT     13
  67 #define EXC_STORE_PAGE_FAULT    15
  68
  69 #ifndef __ASSEMBLY__
  70
  71 #define csr_swap(csr, val)                                      \
  72 ({                                                              \
  73         unsigned long __v = (unsigned long)(val);               \
  74         __asm__ __volatile__ ("csrrw %0, " #csr ", %1"          \
  75                               : "=r" (__v) : "rK" (__v)         \
  76                               : "memory");                      \
  77         __v;                                                    \
  78 })
  79
  80 #define csr_read(csr)                                           \
  81 ({                                                              \
  82         register unsigned long __v;                             \
  83         __asm__ __volatile__ ("csrr %0, " #csr                  \
  84                               : "=r" (__v) :                    \
  85                               : "memory");                      \
  86         __v;                                                    \
  87 })
  88
  89 #define csr_write(csr, val)                                     \
  90 ({                                                              \
  91         unsigned long __v = (unsigned long)(val);               \
  92         __asm__ __volatile__ ("csrw " #csr ", %0"               \
  93                               : : "rK" (__v)                    \
  94                               : "memory");                      \
  95 })
  96
  97 #define csr_read_set(csr, val)                                  \
  98 ({                                                              \
  99         unsigned long __v = (unsigned long)(val);               \
 100         __asm__ __volatile__ ("csrrs %0, " #csr ", %1"          \
 101                               : "=r" (__v) : "rK" (__v)         \
 102                               : "memory");                      \
 103         __v;                                                    \
 104 })
 105
 106 #define csr_set(csr, val)                                       \
 107 ({                                                              \
 108         unsigned long __v = (unsigned long)(val);               \
 109         __asm__ __volatile__ ("csrs " #csr ", %0"               \
 110                               : : "rK" (__v)                    \
 111                               : "memory");                      \
 112 })
 113
 114 #define csr_read_clear(csr, val)                                \
 115 ({                                                              \
 116         unsigned long __v = (unsigned long)(val);               \
 117         __asm__ __volatile__ ("csrrc %0, " #csr ", %1"          \
 118                               : "=r" (__v) : "rK" (__v)         \
 119                               : "memory");                      \
 120         __v;                                                    \
 121 })
 122
 123 #define csr_clear(csr, val)                                     \
 124 ({                                                              \
 125         unsigned long __v = (unsigned long)(val);               \
 126         __asm__ __volatile__ ("csrc " #csr ", %0"               \
 127                               : : "rK" (__v)                    \
 128                               : "memory");                      \
 129 })
 130
 131 #endif /* __ASSEMBLY__ */
 132
 133 #endif /* _ASM_RISCV_CSR_H */