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/*
* 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,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
int ret = 0;
uint64_t temp;
switch (funcid) {
case SBI_EXT_CPPC_READ:
ret = sbi_cppc_read(regs->a0, &temp);
out->value = temp;
break;
case SBI_EXT_CPPC_READ_HI:
#if __riscv_xlen == 32
ret = sbi_cppc_read(regs->a0, &temp);
out->value = temp >> 32;
#else
out->value = 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->value = ret;
ret = 0;
}
break;
default:
ret = SBI_ENOTSUPP;
}
return ret;
}
struct sbi_ecall_extension ecall_cppc;
static int sbi_ecall_cppc_register_extensions(void)
{
if (!sbi_cppc_get_device())
return 0;
return sbi_ecall_register_extension(&ecall_cppc);
}
struct sbi_ecall_extension ecall_cppc = {
.extid_start = SBI_EXT_CPPC,
.extid_end = SBI_EXT_CPPC,
.register_extensions = sbi_ecall_cppc_register_extensions,
.handle = sbi_ecall_cppc_handler,
};
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