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 #ifdef CONFIG_CPU_USE_DOMAINS
  52 #define DOMAIN_USERCLIENT       1
  53 #define DOMAIN_KERNELCLIENT     1
  54 #define DOMAIN_MANAGER  3
  55 #define DOMAIN_VECTORS          DOMAIN_USER
  56 #else
  57
  58 #ifdef CONFIG_PAX_KERNEXEC
  59 #define DOMAIN_MANAGER  1
  60 #define DOMAIN_KERNEXEC 3
  61 #else
  62 #define DOMAIN_MANAGER  1
  63 #endif
  64
  65 #ifdef CONFIG_PAX_MEMORY_UDEREF
  66 #define DOMAIN_USERCLIENT       0
  67 #define DOMAIN_UDEREF           1
  68 #define DOMAIN_VECTORS          DOMAIN_KERNEL
  69 #else
  70 #define DOMAIN_USERCLIENT       1
  71 #define DOMAIN_VECTORS          DOMAIN_USER
  72 #endif
  73 #define DOMAIN_KERNELCLIENT     1
  74
  75 #endif
  76
  77 #define domain_val(dom,type)    ((type) << (2*(dom)))
  78
  79 #ifndef __ASSEMBLY__
  80
  81 #if defined(CONFIG_CPU_USE_DOMAINS) || defined(CONFIG_PAX_KERNEXEC) || defined(CONFIG_PAX_MEMORY_UDEREF)
  82 static inline void set_domain(unsigned val)
  83 {
  84         asm volatile(
  85         "mcr    p15, 0, %0, c3, c0      @ set domain"
  86           : : "r" (val));
  87         isb();
  88 }
  89
  90 extern void modify_domain(unsigned int dom, unsigned int type);
  91 #else
  92 static inline void set_domain(unsigned val) { }
  93 static inline void modify_domain(unsigned dom, unsigned type)   { }
  94 #endif
  95
  96 /*
  97  * Generate the T (user) versions of the LDR/STR and related
  98  * instructions (inline assembly)
  99  */
 100 #ifdef CONFIG_CPU_USE_DOMAINS
 101 #define TUSER(instr)    #instr "t"
 102 #else
 103 #define TUSER(instr)    #instr
 104 #endif
 105
 106 #else /* __ASSEMBLY__ */
 107
 108 /*
 109  * Generate the T (user) versions of the LDR/STR and related
 110  * instructions
 111  */
 112 #ifdef CONFIG_CPU_USE_DOMAINS
 113 #define TUSER(instr)    instr ## t
 114 #else
 115 #define TUSER(instr)    instr
 116 #endif
 117
 118 #endif /* __ASSEMBLY__ */
 119
 120 #endif /* !__ASM_PROC_DOMAIN_H */