LXR linux/arch/arm/include/asm/cp15.h

   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
  68extern unsigned long cr_alignment;      /* defined in entry-armv.S */
  69
  70static inline unsigned long get_cr(void)
  71{
  72        unsigned long val;
  73        asm("mrc p15, 0, %0, c1, c0, 0  @ get CR" : "=r" (val) : : "cc");
  74        return val;
  75}
  76
  77static inline void set_cr(unsigned long val)
  78{
  79        asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
  80          : : "r" (val) : "cc");
  81        isb();
  82}
  83
  84static inline unsigned int get_auxcr(void)
  85{
  86        unsigned int val;
  87        asm("mrc p15, 0, %0, c1, c0, 1  @ get AUXCR" : "=r" (val));
  88        return val;
  89}
  90
  91static inline void set_auxcr(unsigned int val)
  92{
  93        asm volatile("mcr p15, 0, %0, c1, c0, 1 @ set AUXCR"
  94          : : "r" (val));
  95        isb();
  96}
  97
  98#define CPACC_FULL(n)           (3 << (n * 2))
  99#define CPACC_SVC(n)            (1 << (n * 2))
 100#define CPACC_DISABLE(n)        (0 << (n * 2))
 101
 102static inline unsigned int get_copro_access(void)
 103{
 104        unsigned int val;
 105        asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
 106          : "=r" (val) : : "cc");
 107        return val;
 108}
 109
 110static inline void set_copro_access(unsigned int val)
 111{
 112        asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
 113          : : "r" (val) : "cc");
 114        isb();
 115}
 116
 117#else /* ifdef CONFIG_CPU_CP15 */
 118
 119/*
 120 * cr_alignment is tightly coupled to cp15 (at least in the minds of the
 121 * developers). Yielding 0 for machines without a cp15 (and making it
 122 * read-only) is fine for most cases and saves quite some #ifdeffery.
 123 */
 124#define cr_alignment    UL(0)
 125
 126static inline unsigned long get_cr(void)
 127{
 128        return 0;
 129}
 130
 131#endif /* ifdef CONFIG_CPU_CP15 / else */
 132
 133#endif /* ifndef __ASSEMBLY__ */
 134
 135#endif
 136