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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* From asm-compat.h */
#define __stringify_in_c(...) #__VA_ARGS__
#define stringify_in_c(...) __stringify_in_c(__VA_ARGS__) " "
/*
* Macros taken from arch/powerpc/include/asm/ppc-opcode.h and other
* header files.
*/
#define ___PPC_RA(a) (((a) & 0x1f) << 16)
#define ___PPC_RB(b) (((b) & 0x1f) << 11)
#define PPC_INST_COPY 0x7c20060c
#define PPC_INST_PASTE 0x7c20070d
#define PPC_COPY(a, b) stringify_in_c(.long PPC_INST_COPY | \
___PPC_RA(a) | ___PPC_RB(b))
#define PPC_PASTE(a, b) stringify_in_c(.long PPC_INST_PASTE | \
___PPC_RA(a) | ___PPC_RB(b))
#define CR0_SHIFT 28
#define CR0_MASK 0xF
/*
* Copy/paste instructions:
*
* copy RA,RB
* Copy contents of address (RA) + effective_address(RB)
* to internal copy-buffer.
*
* paste RA,RB
* Paste contents of internal copy-buffer to the address
* (RA) + effective_address(RB)
*/
static inline int vas_copy(void *crb, int offset)
{
asm volatile(PPC_COPY(%0, %1)";"
:
: "b" (offset), "b" (crb)
: "memory");
return 0;
}
static inline int vas_paste(void *paste_address, int offset)
{
__u32 cr;
cr = 0;
asm volatile(PPC_PASTE(%1, %2)";"
"mfocrf %0, 0x80;"
: "=r" (cr)
: "b" (offset), "b" (paste_address)
: "memory", "cr0");
return (cr >> CR0_SHIFT) & CR0_MASK;
}
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