arch/arm/include/asm/proc-fns.h

   1 /*
   2  *  arch/arm/include/asm/proc-fns.h
   3  *
   4  *  Copyright (C) 1997-1999 Russell King
   5  *  Copyright (C) 2000 Deep Blue Solutions Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __ASM_PROCFNS_H
  12 #define __ASM_PROCFNS_H
  13
  14 #ifdef __KERNEL__
  15
  16 #include <asm/glue-proc.h>
  17 #include <asm/page.h>
  18
  19 #ifndef __ASSEMBLY__
  20
  21 struct mm_struct;
  22
  23 /*
  24  * Don't change this structure - ASM code relies on it.
  25  */
  26 extern struct processor {
  27         /* MISC
  28          * get data abort address/flags
  29          */
  30         void (*_data_abort)(unsigned long pc);
  31         /*
  32          * Retrieve prefetch fault address
  33          */
  34         unsigned long (*_prefetch_abort)(unsigned long lr);
  35         /*
  36          * Set up any processor specifics
  37          */
  38         void (*_proc_init)(void);
  39         /*
  40          * Disable any processor specifics
  41          */
  42         void (*_proc_fin)(void);
  43         /*
  44          * Special stuff for a reset
  45          */
  46         void (*reset)(unsigned long addr) __attribute__((noreturn));
  47         /*
  48          * Idle the processor
  49          */
  50         int (*_do_idle)(void);
  51         /*
  52          * Processor architecture specific
  53          */
  54         /*
  55          * clean a virtual address range from the
  56          * D-cache without flushing the cache.
  57          */
  58         void (*dcache_clean_area)(void *addr, int size);
  59
  60         /*
  61          * Set the page table
  62          */
  63         void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
  64         /*
  65          * Set a possibly extended PTE.  Non-extended PTEs should
  66          * ignore 'ext'.
  67          */
  68 #ifdef CONFIG_ARM_LPAE
  69         void (*set_pte_ext)(pte_t *ptep, pte_t pte);
  70 #else
  71         void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
  72 #endif
  73
  74         /* Suspend/resume */
  75         unsigned int suspend_size;
  76         void (*do_suspend)(void *);
  77         void (*do_resume)(void *);
  78 } processor;
  79
  80 #ifndef MULTI_CPU
  81 extern void cpu_proc_init(void);
  82 extern void cpu_proc_fin(void);
  83 extern int cpu_do_idle(void);
  84 extern void cpu_dcache_clean_area(void *, int);
  85 extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
  86 #ifdef CONFIG_ARM_LPAE
  87 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
  88 #else
  89 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
  90 #endif
  91 extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
  92
  93 /* These three are private to arch/arm/kernel/suspend.c */
  94 extern void cpu_do_suspend(void *);
  95 extern void cpu_do_resume(void *);
  96 #else
  97 #define cpu_proc_init                   processor._proc_init
  98 #define cpu_proc_fin                    processor._proc_fin
  99 #define cpu_reset                       processor.reset
 100 #define cpu_do_idle                     processor._do_idle
 101 #define cpu_dcache_clean_area           processor.dcache_clean_area
 102 #define cpu_set_pte_ext                 processor.set_pte_ext
 103 #define cpu_do_switch_mm                processor.switch_mm
 104
 105 /* These three are private to arch/arm/kernel/suspend.c */
 106 #define cpu_do_suspend                  processor.do_suspend
 107 #define cpu_do_resume                   processor.do_resume
 108 #endif
 109
 110 extern void cpu_resume(void);
 111
 112 #include <asm/memory.h>
 113
 114 #ifdef CONFIG_MMU
 115
 116 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
 117
 118 #ifdef CONFIG_ARM_LPAE
 119
 120 #define cpu_get_ttbr(nr)                                        \
 121         ({                                                      \
 122                 u64 ttbr;                                       \
 123                 __asm__("mrrc   p15, " #nr ", %Q0, %R0, c2"     \
 124                         : "=r" (ttbr));                         \
 125                 ttbr;                                           \
 126         })
 127
 128 #define cpu_get_pgd()   \
 129         ({                                              \
 130                 u64 pg = cpu_get_ttbr(0);               \
 131                 pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);  \
 132                 (pgd_t *)phys_to_virt(pg);              \
 133         })
 134 #else
 135 #define cpu_get_pgd()   \
 136         ({                                              \
 137                 unsigned long pg;                       \
 138                 __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
 139                          : "=r" (pg) : : "cc");         \
 140                 pg &= ~0x3fff;                          \
 141                 (pgd_t *)phys_to_virt(pg);              \
 142         })
 143 #endif
 144
 145 #else   /*!CONFIG_MMU */
 146
 147 #define cpu_switch_mm(pgd,mm)   { }
 148
 149 #endif
 150
 151 #endif /* __ASSEMBLY__ */
 152 #endif /* __KERNEL__ */
 153 #endif /* __ASM_PROCFNS_H */