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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Intel Corporation <www.intel.com>
* Copyright (C) 2025 Altera Corporation <www.altera.com>
*
*/
#include <cpu_func.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/intel-smc.h>
#include <linux/string.h>
int invoke_smc(u32 func_id, u64 *args, int arg_len, u64 *ret_arg, int ret_len)
{
struct pt_regs regs;
memset(®s, 0, sizeof(regs));
regs.regs[0] = func_id;
if (args)
memcpy(®s.regs[1], args, arg_len * sizeof(*args));
smc_call(®s);
if (ret_arg)
memcpy(ret_arg, ®s.regs[1], ret_len * sizeof(*ret_arg));
return regs.regs[0];
}
int smc_send_mailbox(u32 cmd, u32 len, u32 *arg, u8 urgent, u32 *resp_buf_len,
u32 *resp_buf)
{
int ret;
u64 args[6];
u64 resp[3];
args[0] = cmd;
args[1] = (u64)arg;
args[2] = len;
args[3] = urgent;
args[4] = (u64)resp_buf;
if (arg && len > 0)
flush_dcache_range((uintptr_t)arg, (uintptr_t)arg + len);
if (resp_buf && resp_buf_len && *resp_buf_len > 0) {
args[5] = *resp_buf_len;
flush_dcache_range((uintptr_t)resp_buf, (uintptr_t)resp_buf + *resp_buf_len);
} else {
args[5] = 0;
}
ret = invoke_smc(INTEL_SIP_SMC_MBOX_SEND_CMD, args, ARRAY_SIZE(args),
resp, ARRAY_SIZE(resp));
if (ret == INTEL_SIP_SMC_STATUS_OK && resp_buf && resp_buf_len) {
if (!resp[0])
*resp_buf_len = resp[1];
}
return (int)resp[0];
}
int smc_get_usercode(u32 *usercode)
{
int ret;
u64 resp;
if (!usercode)
return -EINVAL;
ret = invoke_smc(INTEL_SIP_SMC_GET_USERCODE, NULL, 0,
&resp, 1);
if (ret == INTEL_SIP_SMC_STATUS_OK)
*usercode = (u32)resp;
return ret;
}
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