1*f49b7572SRaphael Moreira Zinsly /* SPDX-License-Identifier: GPL-2.0-or-later */
2*f49b7572SRaphael Moreira Zinsly
3*f49b7572SRaphael Moreira Zinsly /* From asm-compat.h */
4*f49b7572SRaphael Moreira Zinsly #define __stringify_in_c(...) #__VA_ARGS__
5*f49b7572SRaphael Moreira Zinsly #define stringify_in_c(...) __stringify_in_c(__VA_ARGS__) " "
6*f49b7572SRaphael Moreira Zinsly
7*f49b7572SRaphael Moreira Zinsly /*
8*f49b7572SRaphael Moreira Zinsly * Macros taken from arch/powerpc/include/asm/ppc-opcode.h and other
9*f49b7572SRaphael Moreira Zinsly * header files.
10*f49b7572SRaphael Moreira Zinsly */
11*f49b7572SRaphael Moreira Zinsly #define ___PPC_RA(a) (((a) & 0x1f) << 16)
12*f49b7572SRaphael Moreira Zinsly #define ___PPC_RB(b) (((b) & 0x1f) << 11)
13*f49b7572SRaphael Moreira Zinsly
14*f49b7572SRaphael Moreira Zinsly #define PPC_INST_COPY 0x7c20060c
15*f49b7572SRaphael Moreira Zinsly #define PPC_INST_PASTE 0x7c20070d
16*f49b7572SRaphael Moreira Zinsly
17*f49b7572SRaphael Moreira Zinsly #define PPC_COPY(a, b) stringify_in_c(.long PPC_INST_COPY | \
18*f49b7572SRaphael Moreira Zinsly ___PPC_RA(a) | ___PPC_RB(b))
19*f49b7572SRaphael Moreira Zinsly #define PPC_PASTE(a, b) stringify_in_c(.long PPC_INST_PASTE | \
20*f49b7572SRaphael Moreira Zinsly ___PPC_RA(a) | ___PPC_RB(b))
21*f49b7572SRaphael Moreira Zinsly #define CR0_SHIFT 28
22*f49b7572SRaphael Moreira Zinsly #define CR0_MASK 0xF
23*f49b7572SRaphael Moreira Zinsly /*
24*f49b7572SRaphael Moreira Zinsly * Copy/paste instructions:
25*f49b7572SRaphael Moreira Zinsly *
26*f49b7572SRaphael Moreira Zinsly * copy RA,RB
27*f49b7572SRaphael Moreira Zinsly * Copy contents of address (RA) + effective_address(RB)
28*f49b7572SRaphael Moreira Zinsly * to internal copy-buffer.
29*f49b7572SRaphael Moreira Zinsly *
30*f49b7572SRaphael Moreira Zinsly * paste RA,RB
31*f49b7572SRaphael Moreira Zinsly * Paste contents of internal copy-buffer to the address
32*f49b7572SRaphael Moreira Zinsly * (RA) + effective_address(RB)
33*f49b7572SRaphael Moreira Zinsly */
vas_copy(void * crb,int offset)34*f49b7572SRaphael Moreira Zinsly static inline int vas_copy(void *crb, int offset)
35*f49b7572SRaphael Moreira Zinsly {
36*f49b7572SRaphael Moreira Zinsly asm volatile(PPC_COPY(%0, %1)";"
37*f49b7572SRaphael Moreira Zinsly :
38*f49b7572SRaphael Moreira Zinsly : "b" (offset), "b" (crb)
39*f49b7572SRaphael Moreira Zinsly : "memory");
40*f49b7572SRaphael Moreira Zinsly
41*f49b7572SRaphael Moreira Zinsly return 0;
42*f49b7572SRaphael Moreira Zinsly }
43*f49b7572SRaphael Moreira Zinsly
vas_paste(void * paste_address,int offset)44*f49b7572SRaphael Moreira Zinsly static inline int vas_paste(void *paste_address, int offset)
45*f49b7572SRaphael Moreira Zinsly {
46*f49b7572SRaphael Moreira Zinsly __u32 cr;
47*f49b7572SRaphael Moreira Zinsly
48*f49b7572SRaphael Moreira Zinsly cr = 0;
49*f49b7572SRaphael Moreira Zinsly asm volatile(PPC_PASTE(%1, %2)";"
50*f49b7572SRaphael Moreira Zinsly "mfocrf %0, 0x80;"
51*f49b7572SRaphael Moreira Zinsly : "=r" (cr)
52*f49b7572SRaphael Moreira Zinsly : "b" (offset), "b" (paste_address)
53*f49b7572SRaphael Moreira Zinsly : "memory", "cr0");
54*f49b7572SRaphael Moreira Zinsly
55*f49b7572SRaphael Moreira Zinsly return (cr >> CR0_SHIFT) & CR0_MASK;
56*f49b7572SRaphael Moreira Zinsly }
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