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/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/io.h>
#include <linux/export.h>
#include <linux/err.h>
#include <asm/compiler.h>
#include <soc/qcom/hvc.h>
#define HVC_RET_SUCCESS 0
#define HVC_RET_ERROR -1
#define HVC_RET_EFUNCNOSUPPORT -2
#define HVC_RET_EINVALARCH -3
#define HVC_RET_EMEMMAP -4
#define HVC_RET_EMEMUNMAP -5
#define HVC_RET_EMEMPERM -6
static int hvc_to_linux_errno(int errno)
{
switch (errno) {
case HVC_RET_SUCCESS:
return 0;
case HVC_RET_ERROR:
return -EIO;
case HVC_RET_EFUNCNOSUPPORT:
return -EOPNOTSUPP;
case HVC_RET_EINVALARCH:
case HVC_RET_EMEMMAP:
case HVC_RET_EMEMUNMAP:
return -EINVAL;
case HVC_RET_EMEMPERM:
return -EPERM;
};
return -EINVAL;
}
#ifdef CONFIG_ARM64
static int __hvc(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
u64 x6, u64 x7, u64 *ret1, u64 *ret2, u64 *ret3)
{
register u64 r0 asm("x0") = x0;
register u64 r1 asm("x1") = x1;
register u64 r2 asm("x2") = x2;
register u64 r3 asm("x3") = x3;
register u64 r4 asm("x4") = x4;
register u64 r5 asm("x5") = x5;
register u64 r6 asm("x6") = x6;
register u64 r7 asm("x7") = x7;
asm volatile(
__asmeq("%0", "x0")
__asmeq("%1", "x1")
__asmeq("%2", "x2")
__asmeq("%3", "x3")
__asmeq("%4", "x4")
__asmeq("%5", "x5")
__asmeq("%6", "x6")
__asmeq("%7", "x7")
"hvc #0\n"
: "+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3)
: "r" (r4), "r" (r5), "r" (r6), "r" (r7));
*ret1 = r1;
*ret2 = r2;
*ret3 = r3;
return r0;
}
#else
static int __hvc(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
u64 x6, u64 x7, u64 *ret1, u64 *ret2, u64 *ret3)
{
return 0;
}
#endif
int hvc(u64 func_id, struct hvc_desc *desc)
{
int ret;
if (!desc)
return -EINVAL;
ret = __hvc(func_id, desc->arg[0], desc->arg[1], desc->arg[2],
desc->arg[3], desc->arg[4], desc->arg[5], 0,
&desc->ret[0], &desc->ret[1], &desc->ret[2]);
return hvc_to_linux_errno(ret);
}
EXPORT_SYMBOL(hvc);
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