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 #include <asm/vdso/cp15.h>
54 
55 extern unsigned long cr_alignment;	/* defined in entry-armv.S */
56 
get_cr(void)57 static inline unsigned long get_cr(void)
58 {
59 	unsigned long val;
60 	asm("mrc p15, 0, %0, c1, c0, 0	@ get CR" : "=r" (val) : : "cc");
61 	return val;
62 }
63 
set_cr(unsigned long val)64 static inline void set_cr(unsigned long val)
65 {
66 	asm volatile("mcr p15, 0, %0, c1, c0, 0	@ set CR"
67 	  : : "r" (val) : "cc");
68 	isb();
69 }
70 
get_auxcr(void)71 static inline unsigned int get_auxcr(void)
72 {
73 	unsigned int val;
74 	asm("mrc p15, 0, %0, c1, c0, 1	@ get AUXCR" : "=r" (val));
75 	return val;
76 }
77 
set_auxcr(unsigned int val)78 static inline void set_auxcr(unsigned int val)
79 {
80 	asm volatile("mcr p15, 0, %0, c1, c0, 1	@ set AUXCR"
81 	  : : "r" (val));
82 	isb();
83 }
84 
85 #define CPACC_FULL(n)		(3 << (n * 2))
86 #define CPACC_SVC(n)		(1 << (n * 2))
87 #define CPACC_DISABLE(n)	(0 << (n * 2))
88 
get_copro_access(void)89 static inline unsigned int get_copro_access(void)
90 {
91 	unsigned int val;
92 	asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
93 	  : "=r" (val) : : "cc");
94 	return val;
95 }
96 
set_copro_access(unsigned int val)97 static inline void set_copro_access(unsigned int val)
98 {
99 	asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
100 	  : : "r" (val) : "cc");
101 	isb();
102 }
103 
104 #else /* ifdef CONFIG_CPU_CP15 */
105 
106 /*
107  * cr_alignment is tightly coupled to cp15 (at least in the minds of the
108  * developers). Yielding 0 for machines without a cp15 (and making it
109  * read-only) is fine for most cases and saves quite some #ifdeffery.
110  */
111 #define cr_alignment	UL(0)
112 
get_cr(void)113 static inline unsigned long get_cr(void)
114 {
115 	return 0;
116 }
117 
118 #endif /* ifdef CONFIG_CPU_CP15 / else */
119 
120 #endif /* ifndef __ASSEMBLY__ */
121 
122 #endif
123