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 #include <asm/reg.h>
11 
12 /*
13  * Copy/paste instructions:
14  *
15  *	copy RA,RB
16  *		Copy contents of address (RA) + effective_address(RB)
17  *		to internal copy-buffer.
18  *
19  *	paste RA,RB
20  *		Paste contents of internal copy-buffer to the address
21  *		(RA) + effective_address(RB)
22  */
23 static inline int vas_copy(void *crb, int offset)
24 {
25 	asm volatile(PPC_COPY(%0, %1)";"
26 		:
27 		: "b" (offset), "b" (crb)
28 		: "memory");
29 
30 	return 0;
31 }
32 
33 static inline int vas_paste(void *paste_address, int offset)
34 {
35 	u32 cr;
36 
37 	cr = 0;
38 	asm volatile(PPC_PASTE(%1, %2)";"
39 		"mfocrf %0, 0x80;"
40 		: "=r" (cr)
41 		: "b" (offset), "b" (paste_address)
42 		: "memory", "cr0");
43 
44 	/* We mask with 0xE to ignore SO */
45 	return (cr >> CR0_SHIFT) & 0xE;
46 }
47