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 /*
  14  * Domain numbers
  15  *
  16  *  DOMAIN_IO     - domain 2 includes all IO only
  17  *  DOMAIN_USER   - domain 1 includes all user memory only
  18  *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
  19  *
  20  * The domain numbering depends on whether we support 36 physical
  21  * address for I/O or not.  Addresses above the 32 bit boundary can
  22  * only be mapped using supersections and supersections can only
  23  * be set for domain 0.  We could just default to DOMAIN_IO as zero,
  24  * but there may be systems with supersection support and no 36-bit
  25  * addressing.  In such cases, we want to map system memory with
  26  * supersections to reduce TLB misses and footprint.
  27  *
  28  * 36-bit addressing and supersections are only available on
  29  * CPUs based on ARMv6+ or the Intel XSC3 core.
  30  */
  31 #ifndef CONFIG_IO_36
  32 #define DOMAIN_KERNEL   0
  33 #define DOMAIN_TABLE    0
  34 #define DOMAIN_USER     1
  35 #define DOMAIN_IO       2
  36 #else
  37 #define DOMAIN_KERNEL   2
  38 #define DOMAIN_TABLE    2
  39 #define DOMAIN_USER     1
  40 #define DOMAIN_IO       0
  41 #endif
  42
  43 /*
  44  * Domain types
  45  */
  46 #define DOMAIN_NOACCESS 0
  47 #define DOMAIN_CLIENT   1
  48 #ifdef CONFIG_CPU_USE_DOMAINS
  49 #define DOMAIN_MANAGER  3
  50 #else
  51 #define DOMAIN_MANAGER  1
  52 #endif
  53
  54 #define domain_val(dom,type)    ((type) << (2*(dom)))
  55
  56 #ifndef __ASSEMBLY__
  57
  58 #ifdef CONFIG_CPU_USE_DOMAINS
  59 #define set_domain(x)                                   \
  60         do {                                            \
  61         __asm__ __volatile__(                           \
  62         "mcr    p15, 0, %0, c3, c0      @ set domain"   \
  63           : : "r" (x));                                 \
  64         isb();                                          \
  65         } while (0)
  66
  67 #define modify_domain(dom,type)                                 \
  68         do {                                                    \
  69         struct thread_info *thread = current_thread_info();     \
  70         unsigned int domain = thread->cpu_domain;               \
  71         domain &= ~domain_val(dom, DOMAIN_MANAGER);             \
  72         thread->cpu_domain = domain | domain_val(dom, type);    \
  73         set_domain(thread->cpu_domain);                         \
  74         } while (0)
  75
  76 #else
  77 #define set_domain(x)           do { } while (0)
  78 #define modify_domain(dom,type) do { } while (0)
  79 #endif
  80
  81 /*
  82  * Generate the T (user) versions of the LDR/STR and related
  83  * instructions (inline assembly)
  84  */
  85 #ifdef CONFIG_CPU_USE_DOMAINS
  86 #define T(instr)        #instr "t"
  87 #else
  88 #define T(instr)        #instr
  89 #endif
  90
  91 #else /* __ASSEMBLY__ */
  92
  93 /*
  94  * Generate the T (user) versions of the LDR/STR and related
  95  * instructions
  96  */
  97 #ifdef CONFIG_CPU_USE_DOMAINS
  98 #define T(instr)        instr ## t
  99 #else
 100 #define T(instr)        instr
 101 #endif
 102
 103 #endif /* __ASSEMBLY__ */
 104
 105 #endif /* !__ASM_PROC_DOMAIN_H */