arch/riscv/kernel/sbi_ecall.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2024 Rivos Inc. */
   3
   4 #include <asm/sbi.h>
   5 #define CREATE_TRACE_POINTS
   6 #include <asm/trace.h>
   7
   8 long __sbi_base_ecall(int fid)
   9 {
  10         struct sbiret ret;
  11
  12         ret = sbi_ecall(SBI_EXT_BASE, fid, 0, 0, 0, 0, 0, 0);
  13         if (!ret.error)
  14                 return ret.value;
  15         else
  16                 return sbi_err_map_linux_errno(ret.error);
  17 }
  18 EXPORT_SYMBOL(__sbi_base_ecall);
  19
  20 struct sbiret __sbi_ecall(unsigned long arg0, unsigned long arg1,
  21                           unsigned long arg2, unsigned long arg3,
  22                           unsigned long arg4, unsigned long arg5,
  23                           int fid, int ext)
  24 {
  25         struct sbiret ret;
  26
  27         trace_sbi_call(ext, fid);
  28
  29         register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
  30         register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
  31         register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
  32         register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
  33         register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
  34         register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
  35         register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
  36         register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
  37         asm volatile ("ecall"
  38                        : "+r" (a0), "+r" (a1)
  39                        : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
  40                        : "memory");
  41         ret.error = a0;
  42         ret.value = a1;
  43
  44         trace_sbi_return(ext, ret.error, ret.value);
  45
  46         return ret;
  47 }
  48 EXPORT_SYMBOL(__sbi_ecall);