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
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