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