12392c8c8SSukadev Bhattiprolu /*
22392c8c8SSukadev Bhattiprolu  * Copyright 2016-17 IBM Corp.
32392c8c8SSukadev Bhattiprolu  *
42392c8c8SSukadev Bhattiprolu  * This program is free software; you can redistribute it and/or
52392c8c8SSukadev Bhattiprolu  * modify it under the terms of the GNU General Public License
62392c8c8SSukadev Bhattiprolu  * as published by the Free Software Foundation; either version
72392c8c8SSukadev Bhattiprolu  * 2 of the License, or (at your option) any later version.
82392c8c8SSukadev Bhattiprolu  */
92392c8c8SSukadev Bhattiprolu #include <asm/ppc-opcode.h>
102392c8c8SSukadev Bhattiprolu 
112392c8c8SSukadev Bhattiprolu #define CR0_SHIFT	28
122392c8c8SSukadev Bhattiprolu #define CR0_MASK	0xF
132392c8c8SSukadev Bhattiprolu /*
142392c8c8SSukadev Bhattiprolu  * Copy/paste instructions:
152392c8c8SSukadev Bhattiprolu  *
162392c8c8SSukadev Bhattiprolu  *	copy RA,RB
172392c8c8SSukadev Bhattiprolu  *		Copy contents of address (RA) + effective_address(RB)
182392c8c8SSukadev Bhattiprolu  *		to internal copy-buffer.
192392c8c8SSukadev Bhattiprolu  *
202392c8c8SSukadev Bhattiprolu  *	paste RA,RB
212392c8c8SSukadev Bhattiprolu  *		Paste contents of internal copy-buffer to the address
222392c8c8SSukadev Bhattiprolu  *		(RA) + effective_address(RB)
232392c8c8SSukadev Bhattiprolu  */
242392c8c8SSukadev Bhattiprolu static inline int vas_copy(void *crb, int offset)
252392c8c8SSukadev Bhattiprolu {
262392c8c8SSukadev Bhattiprolu 	asm volatile(PPC_COPY(%0, %1)";"
272392c8c8SSukadev Bhattiprolu 		:
282392c8c8SSukadev Bhattiprolu 		: "b" (offset), "b" (crb)
292392c8c8SSukadev Bhattiprolu 		: "memory");
302392c8c8SSukadev Bhattiprolu 
312392c8c8SSukadev Bhattiprolu 	return 0;
322392c8c8SSukadev Bhattiprolu }
332392c8c8SSukadev Bhattiprolu 
342392c8c8SSukadev Bhattiprolu static inline int vas_paste(void *paste_address, int offset)
352392c8c8SSukadev Bhattiprolu {
362392c8c8SSukadev Bhattiprolu 	u32 cr;
372392c8c8SSukadev Bhattiprolu 
382392c8c8SSukadev Bhattiprolu 	cr = 0;
392392c8c8SSukadev Bhattiprolu 	asm volatile(PPC_PASTE(%1, %2)";"
402392c8c8SSukadev Bhattiprolu 		"mfocrf %0, 0x80;"
412392c8c8SSukadev Bhattiprolu 		: "=r" (cr)
422392c8c8SSukadev Bhattiprolu 		: "b" (offset), "b" (paste_address)
432392c8c8SSukadev Bhattiprolu 		: "memory", "cr0");
442392c8c8SSukadev Bhattiprolu 
452392c8c8SSukadev Bhattiprolu 	return (cr >> CR0_SHIFT) & CR0_MASK;
462392c8c8SSukadev Bhattiprolu }
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