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 #endif
  16
  17 /*
  18  * Domain numbers
  19  *
  20  *  DOMAIN_IO     - domain 2 includes all IO only
  21  *  DOMAIN_USER   - domain 1 includes all user memory only
  22  *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
  23  *
  24  * The domain numbering depends on whether we support 36 physical
  25  * address for I/O or not.  Addresses above the 32 bit boundary can
  26  * only be mapped using supersections and supersections can only
  27  * be set for domain 0.  We could just default to DOMAIN_IO as zero,
  28  * but there may be systems with supersection support and no 36-bit
  29  * addressing.  In such cases, we want to map system memory with
  30  * supersections to reduce TLB misses and footprint.
  31  *
  32  * 36-bit addressing and supersections are only available on
  33  * CPUs based on ARMv6+ or the Intel XSC3 core.
  34  */
  35 #ifndef CONFIG_IO_36
  36 #define DOMAIN_KERNEL   0
  37 #define DOMAIN_TABLE    0
  38 #define DOMAIN_USER     1
  39 #define DOMAIN_IO       2
  40 #else
  41 #define DOMAIN_KERNEL   2
  42 #define DOMAIN_TABLE    2
  43 #define DOMAIN_USER     1
  44 #define DOMAIN_IO       0
  45 #endif
  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_val(dom,type)    ((type) << (2*(dom)))
  59
  60 #ifndef __ASSEMBLY__
  61
  62 #ifdef CONFIG_CPU_USE_DOMAINS
  63 static inline void set_domain(unsigned val)
  64 {
  65         asm volatile(
  66         "mcr    p15, 0, %0, c3, c0      @ set domain"
  67           : : "r" (val));
  68         isb();
  69 }
  70
  71 #define modify_domain(dom,type)                                 \
  72         do {                                                    \
  73         struct thread_info *thread = current_thread_info();     \
  74         unsigned int domain = thread->cpu_domain;               \
  75         domain &= ~domain_val(dom, DOMAIN_MANAGER);             \
  76         thread->cpu_domain = domain | domain_val(dom, type);    \
  77         set_domain(thread->cpu_domain);                         \
  78         } while (0)
  79
  80 #else
  81 static inline void set_domain(unsigned val) { }
  82 static inline void modify_domain(unsigned dom, unsigned type)   { }
  83 #endif
  84
  85 /*
  86  * Generate the T (user) versions of the LDR/STR and related
  87  * instructions (inline assembly)
  88  */
  89 #ifdef CONFIG_CPU_USE_DOMAINS
  90 #define TUSER(instr)    #instr "t"
  91 #else
  92 #define TUSER(instr)    #instr
  93 #endif
  94
  95 #else /* __ASSEMBLY__ */
  96
  97 /*
  98  * Generate the T (user) versions of the LDR/STR and related
  99  * instructions
 100  */
 101 #ifdef CONFIG_CPU_USE_DOMAINS
 102 #define TUSER(instr)    instr ## t
 103 #else
 104 #define TUSER(instr)    instr
 105 #endif
 106
 107 #endif /* __ASSEMBLY__ */
 108
 109 #endif /* !__ASM_PROC_DOMAIN_H */