1 /*
2  * Copyright 2016-17 IBM Corp.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version
7  * 2 of the License, or (at your option) any later version.
8  */
9 #include <asm/ppc-opcode.h>
10 
11 #define CR0_SHIFT	28
12 #define CR0_MASK	0xF
13 /*
14  * Copy/paste instructions:
15  *
16  *	copy RA,RB
17  *		Copy contents of address (RA) + effective_address(RB)
18  *		to internal copy-buffer.
19  *
20  *	paste RA,RB
21  *		Paste contents of internal copy-buffer to the address
22  *		(RA) + effective_address(RB)
23  */
24 static inline int vas_copy(void *crb, int offset)
25 {
26 	asm volatile(PPC_COPY(%0, %1)";"
27 		:
28 		: "b" (offset), "b" (crb)
29 		: "memory");
30 
31 	return 0;
32 }
33 
34 static inline int vas_paste(void *paste_address, int offset)
35 {
36 	u32 cr;
37 
38 	cr = 0;
39 	asm volatile(PPC_PASTE(%1, %2)";"
40 		"mfocrf %0, 0x80;"
41 		: "=r" (cr)
42 		: "b" (offset), "b" (paste_address)
43 		: "memory", "cr0");
44 
45 	return (cr >> CR0_SHIFT) & CR0_MASK;
46 }
47