LXR linux/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#ifdef CONFIG_CPU_CP15_MMU
  88static inline unsigned int get_domain(void)
  89{
  90        unsigned int domain;
  91
  92        asm(
  93        "mrc    p15, 0, %0, c3, c0      @ get domain"
  94         : "=r" (domain)
  95         : "m" (current_thread_info()->cpu_domain));
  96
  97        return domain;
  98}
  99
 100static inline void set_domain(unsigned val)
 101{
 102        asm volatile(
 103        "mcr    p15, 0, %0, c3, c0      @ set domain"
 104          : : "r" (val) : "memory");
 105        isb();
 106}
 107#else
 108static inline unsigned int get_domain(void)
 109{
 110        return 0;
 111}
 112
 113static inline void set_domain(unsigned val)
 114{
 115}
 116#endif
 117
 118#ifdef CONFIG_CPU_USE_DOMAINS
 119#define modify_domain(dom,type)                                 \
 120        do {                                                    \
 121                unsigned int domain = get_domain();             \
 122                domain &= ~domain_mask(dom);                    \
 123                domain = domain | domain_val(dom, type);        \
 124                set_domain(domain);                             \
 125        } while (0)
 126
 127#else
 128static inline void modify_domain(unsigned dom, unsigned type)   { }
 129#endif
 130
 131/*
 132 * Generate the T (user) versions of the LDR/STR and related
 133 * instructions (inline assembly)
 134 */
 135#ifdef CONFIG_CPU_USE_DOMAINS
 136#define TUSER(instr)    #instr "t"
 137#else
 138#define TUSER(instr)    #instr
 139#endif
 140
 141#else /* __ASSEMBLY__ */
 142
 143/*
 144 * Generate the T (user) versions of the LDR/STR and related
 145 * instructions
 146 */
 147#ifdef CONFIG_CPU_USE_DOMAINS
 148#define TUSER(instr)    instr ## t
 149#else
 150#define TUSER(instr)    instr
 151#endif
 152
 153#endif /* __ASSEMBLY__ */
 154
 155#endif /* !__ASM_PROC_DOMAIN_H */
 156