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 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          * Check for processor bugs
  41          */
  42         void (*check_bugs)(void);
  43         /*
  44          * Disable any processor specifics
  45          */
  46         void (*_proc_fin)(void);
  47         /*
  48          * Special stuff for a reset
  49          */
  50         void (*reset)(unsigned long addr, bool hvc) __attribute__((noreturn));
  51         /*
  52          * Idle the processor
  53          */
  54         int (*_do_idle)(void);
  55         /*
  56          * Processor architecture specific
  57          */
  58         /*
  59          * clean a virtual address range from the
  60          * D-cache without flushing the cache.
  61          */
  62         void (*dcache_clean_area)(void *addr, int size);
  63
  64         /*
  65          * Set the page table
  66          */
  67         void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
  68         /*
  69          * Set a possibly extended PTE.  Non-extended PTEs should
  70          * ignore 'ext'.
  71          */
  72 #ifdef CONFIG_ARM_LPAE
  73         void (*set_pte_ext)(pte_t *ptep, pte_t pte);
  74 #else
  75         void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
  76 #endif
  77
  78         /* Suspend/resume */
  79         unsigned int suspend_size;
  80         void (*do_suspend)(void *);
  81         void (*do_resume)(void *);
  82 };
  83
  84 #ifndef MULTI_CPU
  85 static inline void init_proc_vtable(const struct processor *p)
  86 {
  87 }
  88
  89 extern void cpu_proc_init(void);
  90 extern void cpu_proc_fin(void);
  91 extern int cpu_do_idle(void);
  92 extern void cpu_dcache_clean_area(void *, int);
  93 extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
  94 #ifdef CONFIG_ARM_LPAE
  95 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
  96 #else
  97 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
  98 #endif
  99 extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn));
 100
 101 /* These three are private to arch/arm/kernel/suspend.c */
 102 extern void cpu_do_suspend(void *);
 103 extern void cpu_do_resume(void *);
 104 #else
 105
 106 extern struct processor processor;
 107 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
 108 #include <linux/smp.h>
 109 /*
 110  * This can't be a per-cpu variable because we need to access it before
 111  * per-cpu has been initialised.  We have a couple of functions that are
 112  * called in a pre-emptible context, and so can't use smp_processor_id()
 113  * there, hence PROC_TABLE().  We insist in init_proc_vtable() that the
 114  * function pointers for these are identical across all CPUs.
 115  */
 116 extern struct processor *cpu_vtable[];
 117 #define PROC_VTABLE(f)                  cpu_vtable[smp_processor_id()]->f
 118 #define PROC_TABLE(f)                   cpu_vtable[0]->f
 119 static inline void init_proc_vtable(const struct processor *p)
 120 {
 121         unsigned int cpu = smp_processor_id();
 122         *cpu_vtable[cpu] = *p;
 123         WARN_ON_ONCE(cpu_vtable[cpu]->dcache_clean_area !=
 124                      cpu_vtable[0]->dcache_clean_area);
 125         WARN_ON_ONCE(cpu_vtable[cpu]->set_pte_ext !=
 126                      cpu_vtable[0]->set_pte_ext);
 127 }
 128 #else
 129 #define PROC_VTABLE(f)                  processor.f
 130 #define PROC_TABLE(f)                   processor.f
 131 static inline void init_proc_vtable(const struct processor *p)
 132 {
 133         processor = *p;
 134 }
 135 #endif
 136
 137 #define cpu_proc_init                   PROC_VTABLE(_proc_init)
 138 #define cpu_check_bugs                  PROC_VTABLE(check_bugs)
 139 #define cpu_proc_fin                    PROC_VTABLE(_proc_fin)
 140 #define cpu_reset                       PROC_VTABLE(reset)
 141 #define cpu_do_idle                     PROC_VTABLE(_do_idle)
 142 #define cpu_dcache_clean_area           PROC_TABLE(dcache_clean_area)
 143 #define cpu_set_pte_ext                 PROC_TABLE(set_pte_ext)
 144 #define cpu_do_switch_mm                PROC_VTABLE(switch_mm)
 145
 146 /* These two are private to arch/arm/kernel/suspend.c */
 147 #define cpu_do_suspend                  PROC_VTABLE(do_suspend)
 148 #define cpu_do_resume                   PROC_VTABLE(do_resume)
 149 #endif
 150
 151 extern void cpu_resume(void);
 152
 153 #include <asm/memory.h>
 154
 155 #ifdef CONFIG_MMU
 156
 157 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
 158
 159 #ifdef CONFIG_ARM_LPAE
 160
 161 #define cpu_get_ttbr(nr)                                        \
 162         ({                                                      \
 163                 u64 ttbr;                                       \
 164                 __asm__("mrrc   p15, " #nr ", %Q0, %R0, c2"     \
 165                         : "=r" (ttbr));                         \
 166                 ttbr;                                           \
 167         })
 168
 169 #define cpu_get_pgd()   \
 170         ({                                              \
 171                 u64 pg = cpu_get_ttbr(0);               \
 172                 pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);  \
 173                 (pgd_t *)phys_to_virt(pg);              \
 174         })
 175 #else
 176 #define cpu_get_pgd()   \
 177         ({                                              \
 178                 unsigned long pg;                       \
 179                 __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
 180                          : "=r" (pg) : : "cc");         \
 181                 pg &= ~0x3fff;                          \
 182                 (pgd_t *)phys_to_virt(pg);              \
 183         })
 184 #endif
 185
 186 #else   /*!CONFIG_MMU */
 187
 188 #define cpu_switch_mm(pgd,mm)   { }
 189
 190 #endif
 191
 192 #endif /* __ASSEMBLY__ */
 193 #endif /* __KERNEL__ */
 194 #endif /* __ASM_PROCFNS_H */