64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2023 Ventana Micro Systems Inc.
|
|
*
|
|
*/
|
|
|
|
#include <sbi/sbi_ecall.h>
|
|
#include <sbi/sbi_ecall_interface.h>
|
|
#include <sbi/sbi_error.h>
|
|
#include <sbi/sbi_trap.h>
|
|
#include <sbi/sbi_cppc.h>
|
|
|
|
static int sbi_ecall_cppc_handler(unsigned long extid, unsigned long funcid,
|
|
const struct sbi_trap_regs *regs,
|
|
unsigned long *out_val,
|
|
struct sbi_trap_info *out_trap)
|
|
{
|
|
int ret = 0;
|
|
uint64_t temp;
|
|
|
|
switch (funcid) {
|
|
case SBI_EXT_CPPC_READ:
|
|
ret = sbi_cppc_read(regs->a0, &temp);
|
|
*out_val = temp;
|
|
break;
|
|
case SBI_EXT_CPPC_READ_HI:
|
|
#if __riscv_xlen == 32
|
|
ret = sbi_cppc_read(regs->a0, &temp);
|
|
*out_val = temp >> 32;
|
|
#else
|
|
*out_val = 0;
|
|
#endif
|
|
break;
|
|
case SBI_EXT_CPPC_WRITE:
|
|
ret = sbi_cppc_write(regs->a0, regs->a1);
|
|
break;
|
|
case SBI_EXT_CPPC_PROBE:
|
|
ret = sbi_cppc_probe(regs->a0);
|
|
if (ret >= 0) {
|
|
*out_val = ret;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
default:
|
|
ret = SBI_ENOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sbi_ecall_cppc_probe(unsigned long extid, unsigned long *out_val)
|
|
{
|
|
*out_val = sbi_cppc_get_device() ? 1 : 0;
|
|
return 0;
|
|
}
|
|
|
|
struct sbi_ecall_extension ecall_cppc = {
|
|
.extid_start = SBI_EXT_CPPC,
|
|
.extid_end = SBI_EXT_CPPC,
|
|
.handle = sbi_ecall_cppc_handler,
|
|
.probe = sbi_ecall_cppc_probe,
|
|
};
|