57 lines · c
1/* SPDX-License-Identifier: GPL-2.0-or-later */2 3/* From asm-compat.h */4#define __stringify_in_c(...) #__VA_ARGS__5#define stringify_in_c(...) __stringify_in_c(__VA_ARGS__) " "6 7/*8 * Macros taken from arch/powerpc/include/asm/ppc-opcode.h and other9 * header files.10 */11#define ___PPC_RA(a) (((a) & 0x1f) << 16)12#define ___PPC_RB(b) (((b) & 0x1f) << 11)13 14#define PPC_INST_COPY 0x7c20060c15#define PPC_INST_PASTE 0x7c20070d16 17#define PPC_COPY(a, b) stringify_in_c(.long PPC_INST_COPY | \18 ___PPC_RA(a) | ___PPC_RB(b))19#define PPC_PASTE(a, b) stringify_in_c(.long PPC_INST_PASTE | \20 ___PPC_RA(a) | ___PPC_RB(b))21#define CR0_SHIFT 2822#define CR0_MASK 0xF23/*24 * Copy/paste instructions:25 *26 * copy RA,RB27 * Copy contents of address (RA) + effective_address(RB)28 * to internal copy-buffer.29 *30 * paste RA,RB31 * Paste contents of internal copy-buffer to the address32 * (RA) + effective_address(RB)33 */34static inline int vas_copy(void *crb, int offset)35{36 asm volatile(PPC_COPY(%0, %1)";"37 :38 : "b" (offset), "b" (crb)39 : "memory");40 41 return 0;42}43 44static inline int vas_paste(void *paste_address, int offset)45{46 __u32 cr;47 48 cr = 0;49 asm volatile(PPC_PASTE(%1, %2)";"50 "mfocrf %0, 0x80;"51 : "=r" (cr)52 : "b" (offset), "b" (paste_address)53 : "memory", "cr0");54 55 return (cr >> CR0_SHIFT) & CR0_MASK;56}57