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 other 9 * 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 0x7c20060c 15 #define PPC_INST_PASTE 0x7c20070d 16 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 28 22 #define CR0_MASK 0xF 23 /* 24 * Copy/paste instructions: 25 * 26 * copy RA,RB 27 * Copy contents of address (RA) + effective_address(RB) 28 * to internal copy-buffer. 29 * 30 * paste RA,RB 31 * Paste contents of internal copy-buffer to the address 32 * (RA) + effective_address(RB) 33 */ 34 static 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 44 static 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