arch/arm/include/asm/domain.h

   1 /*
   2  *  arch/arm/include/asm/domain.h
   3  *
   4  *  Copyright (C) 1999 Russell King.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef __ASM_PROC_DOMAIN_H
  11 #define __ASM_PROC_DOMAIN_H
  12
  13 #ifndef __ASSEMBLY__
  14 #include <asm/barrier.h>
  15 #include <asm/thread_info.h>
  16 #endif
  17
  18 /*
  19  * Domain numbers
  20  *
  21  *  DOMAIN_IO     - domain 2 includes all IO only
  22  *  DOMAIN_USER   - domain 1 includes all user memory only
  23  *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
  24  *
  25  * The domain numbering depends on whether we support 36 physical
  26  * address for I/O or not.  Addresses above the 32 bit boundary can
  27  * only be mapped using supersections and supersections can only
  28  * be set for domain 0.  We could just default to DOMAIN_IO as zero,
  29  * but there may be systems with supersection support and no 36-bit
  30  * addressing.  In such cases, we want to map system memory with
  31  * supersections to reduce TLB misses and footprint.
  32  *
  33  * 36-bit addressing and supersections are only available on
  34  * CPUs based on ARMv6+ or the Intel XSC3 core.
  35  */
  36 #ifndef CONFIG_IO_36
  37 #define DOMAIN_KERNEL   0
  38 #define DOMAIN_USER     1
  39 #define DOMAIN_IO       2
  40 #else
  41 #define DOMAIN_KERNEL   2
  42 #define DOMAIN_USER     1
  43 #define DOMAIN_IO       0
  44 #endif
  45 #define DOMAIN_VECTORS  3
  46
  47 /*
  48  * Domain types
  49  */
  50 #define DOMAIN_NOACCESS 0
  51 #define DOMAIN_CLIENT   1
  52 #ifdef CONFIG_CPU_USE_DOMAINS
  53 #define DOMAIN_MANAGER  3
  54 #else
  55 #define DOMAIN_MANAGER  1
  56 #endif
  57
  58 #define domain_mask(dom)        ((3) << (2 * (dom)))
  59 #define domain_val(dom,type)    ((type) << (2 * (dom)))
  60
  61 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
  62 #define DACR_INIT \
  63         (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
  64          domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
  65          domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
  66          domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
  67 #else
  68 #define DACR_INIT \
  69         (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
  70          domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
  71          domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
  72          domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
  73 #endif
  74
  75 #define __DACR_DEFAULT \
  76         domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
  77         domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
  78         domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)
  79
  80 #define DACR_UACCESS_DISABLE    \
  81         (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
  82 #define DACR_UACCESS_ENABLE     \
  83         (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT))
  84
  85 #ifndef __ASSEMBLY__
  86
  87 static inline unsigned int get_domain(void)
  88 {
  89         unsigned int domain;
  90
  91         asm(
  92         "mrc    p15, 0, %0, c3, c0      @ get domain"
  93          : "=r" (domain)
  94          : "m" (current_thread_info()->cpu_domain));
  95
  96         return domain;
  97 }
  98
  99 static inline void set_domain(unsigned val)
 100 {
 101         asm volatile(
 102         "mcr    p15, 0, %0, c3, c0      @ set domain"
 103           : : "r" (val) : "memory");
 104         isb();
 105 }
 106
 107 #ifdef CONFIG_CPU_USE_DOMAINS
 108 #define modify_domain(dom,type)                                 \
 109         do {                                                    \
 110                 unsigned int domain = get_domain();             \
 111                 domain &= ~domain_mask(dom);                    \
 112                 domain = domain | domain_val(dom, type);        \
 113                 set_domain(domain);                             \
 114         } while (0)
 115
 116 #else
 117 static inline void modify_domain(unsigned dom, unsigned type)   { }
 118 #endif
 119
 120 /*
 121  * Generate the T (user) versions of the LDR/STR and related
 122  * instructions (inline assembly)
 123  */
 124 #ifdef CONFIG_CPU_USE_DOMAINS
 125 #define TUSER(instr)    #instr "t"
 126 #else
 127 #define TUSER(instr)    #instr
 128 #endif
 129
 130 #else /* __ASSEMBLY__ */
 131
 132 /*
 133  * Generate the T (user) versions of the LDR/STR and related
 134  * instructions
 135  */
 136 #ifdef CONFIG_CPU_USE_DOMAINS
 137 #define TUSER(instr)    instr ## t
 138 #else
 139 #define TUSER(instr)    instr
 140 #endif
 141
 142 #endif /* __ASSEMBLY__ */
 143
 144 #endif /* !__ASM_PROC_DOMAIN_H */