1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_ARM_CP15_H
3 #define __ASM_ARM_CP15_H
4
5 #include <asm/barrier.h>
6
7 /*
8 * CR1 bits (CP#15 CR1)
9 */
10 #define CR_M (1 << 0) /* MMU enable */
11 #define CR_A (1 << 1) /* Alignment abort enable */
12 #define CR_C (1 << 2) /* Dcache enable */
13 #define CR_W (1 << 3) /* Write buffer enable */
14 #define CR_P (1 << 4) /* 32-bit exception handler */
15 #define CR_D (1 << 5) /* 32-bit data address range */
16 #define CR_L (1 << 6) /* Implementation defined */
17 #define CR_B (1 << 7) /* Big endian */
18 #define CR_S (1 << 8) /* System MMU protection */
19 #define CR_R (1 << 9) /* ROM MMU protection */
20 #define CR_F (1 << 10) /* Implementation defined */
21 #define CR_Z (1 << 11) /* Implementation defined */
22 #define CR_I (1 << 12) /* Icache enable */
23 #define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
24 #define CR_RR (1 << 14) /* Round Robin cache replacement */
25 #define CR_L4 (1 << 15) /* LDR pc can set T bit */
26 #define CR_DT (1 << 16)
27 #ifdef CONFIG_MMU
28 #define CR_HA (1 << 17) /* Hardware management of Access Flag */
29 #else
30 #define CR_BR (1 << 17) /* MPU Background region enable (PMSA) */
31 #endif
32 #define CR_IT (1 << 18)
33 #define CR_ST (1 << 19)
34 #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
35 #define CR_U (1 << 22) /* Unaligned access operation */
36 #define CR_XP (1 << 23) /* Extended page tables */
37 #define CR_VE (1 << 24) /* Vectored interrupts */
38 #define CR_EE (1 << 25) /* Exception (Big) Endian */
39 #define CR_TRE (1 << 28) /* TEX remap enable */
40 #define CR_AFE (1 << 29) /* Access flag enable */
41 #define CR_TE (1 << 30) /* Thumb exception enable */
42
43 #ifndef __ASSEMBLY__
44
45 #if __LINUX_ARM_ARCH__ >= 4
46 #define vectors_high() (get_cr() & CR_V)
47 #else
48 #define vectors_high() (0)
49 #endif
50
51 #ifdef CONFIG_CPU_CP15
52
53 #define __ACCESS_CP15(CRn, Op1, CRm, Op2) \
54 "mrc", "mcr", __stringify(p15, Op1, %0, CRn, CRm, Op2), u32
55 #define __ACCESS_CP15_64(Op1, CRm) \
56 "mrrc", "mcrr", __stringify(p15, Op1, %Q0, %R0, CRm), u64
57
58 #define __read_sysreg(r, w, c, t) ({ \
59 t __val; \
60 asm volatile(r " " c : "=r" (__val)); \
61 __val; \
62 })
63 #define read_sysreg(...) __read_sysreg(__VA_ARGS__)
64
65 #define __write_sysreg(v, r, w, c, t) asm volatile(w " " c : : "r" ((t)(v)))
66 #define write_sysreg(v, ...) __write_sysreg(v, __VA_ARGS__)
67
68 #define BPIALL __ACCESS_CP15(c7, 0, c5, 6)
69 #define ICIALLU __ACCESS_CP15(c7, 0, c5, 0)
70
71 extern unsigned long cr_alignment; /* defined in entry-armv.S */
72
get_cr(void)73 static inline unsigned long get_cr(void)
74 {
75 unsigned long val;
76 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
77 return val;
78 }
79
set_cr(unsigned long val)80 static inline void set_cr(unsigned long val)
81 {
82 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
83 : : "r" (val) : "cc");
84 isb();
85 }
86
get_auxcr(void)87 static inline unsigned int get_auxcr(void)
88 {
89 unsigned int val;
90 asm("mrc p15, 0, %0, c1, c0, 1 @ get AUXCR" : "=r" (val));
91 return val;
92 }
93
set_auxcr(unsigned int val)94 static inline void set_auxcr(unsigned int val)
95 {
96 asm volatile("mcr p15, 0, %0, c1, c0, 1 @ set AUXCR"
97 : : "r" (val));
98 isb();
99 }
100
101 #define CPACC_FULL(n) (3 << (n * 2))
102 #define CPACC_SVC(n) (1 << (n * 2))
103 #define CPACC_DISABLE(n) (0 << (n * 2))
104
get_copro_access(void)105 static inline unsigned int get_copro_access(void)
106 {
107 unsigned int val;
108 asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
109 : "=r" (val) : : "cc");
110 return val;
111 }
112
set_copro_access(unsigned int val)113 static inline void set_copro_access(unsigned int val)
114 {
115 asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
116 : : "r" (val) : "cc");
117 isb();
118 }
119
120 #else /* ifdef CONFIG_CPU_CP15 */
121
122 /*
123 * cr_alignment is tightly coupled to cp15 (at least in the minds of the
124 * developers). Yielding 0 for machines without a cp15 (and making it
125 * read-only) is fine for most cases and saves quite some #ifdeffery.
126 */
127 #define cr_alignment UL(0)
128
get_cr(void)129 static inline unsigned long get_cr(void)
130 {
131 return 0;
132 }
133
134 #endif /* ifdef CONFIG_CPU_CP15 / else */
135
136 #endif /* ifndef __ASSEMBLY__ */
137
138 #endif
139
