LXR linux/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
  21struct mm_struct;
  22
  23/*
  24 * Don't change this structure - ASM code relies on it.
  25 */
  26extern 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} processor;
  83
  84#ifndef MULTI_CPU
  85extern void cpu_proc_init(void);
  86extern void cpu_proc_fin(void);
  87extern int cpu_do_idle(void);
  88extern void cpu_dcache_clean_area(void *, int);
  89extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
  90#ifdef CONFIG_ARM_LPAE
  91extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
  92#else
  93extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
  94#endif
  95extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn));
  96
  97/* These three are private to arch/arm/kernel/suspend.c */
  98extern void cpu_do_suspend(void *);
  99extern void cpu_do_resume(void *);
 100#else
 101#define cpu_proc_init                   processor._proc_init
 102#define cpu_proc_fin                    processor._proc_fin
 103#define cpu_reset                       processor.reset
 104#define cpu_do_idle                     processor._do_idle
 105#define cpu_dcache_clean_area           processor.dcache_clean_area
 106#define cpu_set_pte_ext                 processor.set_pte_ext
 107#define cpu_do_switch_mm                processor.switch_mm
 108
 109/* These three are private to arch/arm/kernel/suspend.c */
 110#define cpu_do_suspend                  processor.do_suspend
 111#define cpu_do_resume                   processor.do_resume
 112#endif
 113
 114extern void cpu_resume(void);
 115
 116#include <asm/memory.h>
 117
 118#ifdef CONFIG_MMU
 119
 120#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
 121
 122#ifdef CONFIG_ARM_LPAE
 123
 124#define cpu_get_ttbr(nr)                                        \
 125        ({                                                      \
 126                u64 ttbr;                                       \
 127                __asm__("mrrc   p15, " #nr ", %Q0, %R0, c2"     \
 128                        : "=r" (ttbr));                         \
 129                ttbr;                                           \
 130        })
 131
 132#define cpu_get_pgd()   \
 133        ({                                              \
 134                u64 pg = cpu_get_ttbr(0);               \
 135                pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);  \
 136                (pgd_t *)phys_to_virt(pg);              \
 137        })
 138#else
 139#define cpu_get_pgd()   \
 140        ({                                              \
 141                unsigned long pg;                       \
 142                __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
 143                         : "=r" (pg) : : "cc");         \
 144                pg &= ~0x3fff;                          \
 145                (pgd_t *)phys_to_virt(pg);              \
 146        })
 147#endif
 148
 149#else   /*!CONFIG_MMU */
 150
 151#define cpu_switch_mm(pgd,mm)   { }
 152
 153#endif
 154
 155#endif /* __ASSEMBLY__ */
 156#endif /* __KERNEL__ */
 157#endif /* __ASM_PROCFNS_H */
 158