/* 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; }