arch/riscv/include/asm/sbi.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_SBI_H
  15 #define _ASM_RISCV_SBI_H
  16
  17 #include <linux/types.h>
  18
  19 #define SBI_SET_TIMER 0
  20 #define SBI_CONSOLE_PUTCHAR 1
  21 #define SBI_CONSOLE_GETCHAR 2
  22 #define SBI_CLEAR_IPI 3
  23 #define SBI_SEND_IPI 4
  24 #define SBI_REMOTE_FENCE_I 5
  25 #define SBI_REMOTE_SFENCE_VMA 6
  26 #define SBI_REMOTE_SFENCE_VMA_ASID 7
  27 #define SBI_SHUTDOWN 8
  28
  29 #define SBI_CALL(which, arg0, arg1, arg2) ({                    \
  30         register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);   \
  31         register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);   \
  32         register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);   \
  33         register uintptr_t a7 asm ("a7") = (uintptr_t)(which);  \
  34         asm volatile ("ecall"                                   \
  35                       : "+r" (a0)                               \
  36                       : "r" (a1), "r" (a2), "r" (a7)            \
  37                       : "memory");                              \
  38         a0;                                                     \
  39 })
  40
  41 /* Lazy implementations until SBI is finalized */
  42 #define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0)
  43 #define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0)
  44 #define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0)
  45
  46 static inline void sbi_console_putchar(int ch)
  47 {
  48         SBI_CALL_1(SBI_CONSOLE_PUTCHAR, ch);
  49 }
  50
  51 static inline int sbi_console_getchar(void)
  52 {
  53         return SBI_CALL_0(SBI_CONSOLE_GETCHAR);
  54 }
  55
  56 static inline void sbi_set_timer(uint64_t stime_value)
  57 {
  58 #if __riscv_xlen == 32
  59         SBI_CALL_2(SBI_SET_TIMER, stime_value, stime_value >> 32);
  60 #else
  61         SBI_CALL_1(SBI_SET_TIMER, stime_value);
  62 #endif
  63 }
  64
  65 static inline void sbi_shutdown(void)
  66 {
  67         SBI_CALL_0(SBI_SHUTDOWN);
  68 }
  69
  70 static inline void sbi_clear_ipi(void)
  71 {
  72         SBI_CALL_0(SBI_CLEAR_IPI);
  73 }
  74
  75 static inline void sbi_send_ipi(const unsigned long *hart_mask)
  76 {
  77         SBI_CALL_1(SBI_SEND_IPI, hart_mask);
  78 }
  79
  80 static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
  81 {
  82         SBI_CALL_1(SBI_REMOTE_FENCE_I, hart_mask);
  83 }
  84
  85 static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
  86                                          unsigned long start,
  87                                          unsigned long size)
  88 {
  89         SBI_CALL_1(SBI_REMOTE_SFENCE_VMA, hart_mask);
  90 }
  91
  92 static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
  93                                               unsigned long start,
  94                                               unsigned long size,
  95                                               unsigned long asid)
  96 {
  97         SBI_CALL_1(SBI_REMOTE_SFENCE_VMA_ASID, hart_mask);
  98 }
  99
 100 #endif