Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_FUTEX_H
#define _ASM_FUTEX_H
 
#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
 
#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
do {									\
<------>register unsigned long r8 __asm ("r8") = 0;			\
<------>__asm__ __volatile__(						\
<------><------>"	mf;;					\n"	\
<------><------>"[1:] "	insn ";;				\n"	\
<------><------>"	.xdata4 \"__ex_table\", 1b-., 2f-.	\n"	\
<------><------>"[2:]"							\
<------><------>: "+r" (r8), "=r" (oldval)				\
<------><------>: "r" (uaddr), "r" (oparg)				\
<------><------>: "memory");						\
<------>ret = r8;							\
} while (0)
 
#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
do {									\
<------>register unsigned long r8 __asm ("r8") = 0;			\
<------>int val, newval;						\
<------>do {								\
<------><------>__asm__ __volatile__(					\
<------><------><------>"	mf;;				  \n"	\
<------><------><------>"[1:]	ld4 %3=[%4];;			  \n"	\
<------><------><------>"	mov %2=%3			  \n"	\
<------><------><------><------>insn	";;			  \n"	\
<------><------><------>"	mov ar.ccv=%2;;			  \n"	\
<------><------><------>"[2:]	cmpxchg4.acq %1=[%4],%3,ar.ccv;;  \n"	\
<------><------><------>"	.xdata4 \"__ex_table\", 1b-., 3f-.\n"	\
<------><------><------>"	.xdata4 \"__ex_table\", 2b-., 3f-.\n"	\
<------><------><------>"[3:]"						\
<------><------><------>: "+r" (r8), "=r" (val), "=&r" (oldval),	\
<------><------><------>   "=&r" (newval)				\
<------><------><------>: "r" (uaddr), "r" (oparg)			\
<------><------><------>: "memory");					\
<------><------>if (unlikely (r8))					\
<------><------><------>break;						\
<------>} while (unlikely (val != oldval));				\
<------>ret = r8;							\
} while (0)
 
static inline int
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
{
<------>int oldval = 0, ret;
 
<------>if (!access_ok(uaddr, sizeof(u32)))
<------><------>return -EFAULT;
 
<------>switch (op) {
<------>case FUTEX_OP_SET:
<------><------>__futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
<------><------><------><------>   oparg);
<------><------>break;
<------>case FUTEX_OP_ADD:
<------><------>__futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
<------><------>break;
<------>case FUTEX_OP_OR:
<------><------>__futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
<------><------>break;
<------>case FUTEX_OP_ANDN:
<------><------>__futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
<------><------><------><------>   ~oparg);
<------><------>break;
<------>case FUTEX_OP_XOR:
<------><------>__futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg);
<------><------>break;
<------>default:
<------><------>ret = -ENOSYS;
<------>}
 
<------>if (!ret)
<------><------>*oval = oldval;
 
<------>return ret;
}
 
static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
<------><------><------>      u32 oldval, u32 newval)
{
<------>if (!access_ok(uaddr, sizeof(u32)))
<------><------>return -EFAULT;
 
<------>{
<------><------>register unsigned long r8 __asm ("r8") = 0;
<------><------>unsigned long prev;
<------><------>__asm__ __volatile__(
<------><------><------>"	mf;;					\n"
<------><------><------>"	mov ar.ccv=%4;;				\n"
<------><------><------>"[1:]	cmpxchg4.acq %1=[%2],%3,ar.ccv		\n"
<------><------><------>"	.xdata4 \"__ex_table\", 1b-., 2f-.	\n"
<------><------><------>"[2:]"
<------><------><------>: "+r" (r8), "=&r" (prev)
<------><------><------>: "r" (uaddr), "r" (newval),
<------><------><------>  "rO" ((long) (unsigned) oldval)
<------><------><------>: "memory");
<------><------>*uval = prev;
<------><------>return r8;
<------>}
}
 
#endif /* _ASM_FUTEX_H */