proc-fns.h

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/*
 *  arch/arm/include/asm/proc-fns.h
 *
 *  Copyright (C) 1997-1999 Russell King
 *  Copyright (C) 2000 Deep Blue Solutions Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_PROCFNS_H
#define __ASM_PROCFNS_H

#ifdef __KERNEL__

#include <asm/glue-proc.h>
#include <asm/page.h>

#ifndef __ASSEMBLY__

struct mm_struct;

/*
 * Don't change this structure - ASM code relies on it.
 */
extern struct processor {
    /* MISC
     * get data abort address/flags
     */
    void (*_data_abort)(unsigned long pc);
    /*
     * Retrieve prefetch fault address
     */
    unsigned long (*_prefetch_abort)(unsigned long lr);
    /*
     * Set up any processor specifics
     */
    void (*_proc_init)(void);
    /*
     * Disable any processor specifics
     */
    void (*_proc_fin)(void);
    /*
     * Special stuff for a reset
     */
    void (*reset)(unsigned long addr) __attribute__((noreturn));
    /*
     * Idle the processor
     */
    int (*_do_idle)(void);
    /*
     * Processor architecture specific
     */
    /*
     * clean a virtual address range from the
     * D-cache without flushing the cache.
     */
    void (*dcache_clean_area)(void *addr, int size);

    /*
     * Set the page table
     */
    void (*switch_mm)(unsigned long pgd_phys, struct mm_struct *mm);
    /*
     * Set a possibly extended PTE.  Non-extended PTEs should
     * ignore 'ext'.
     */
#ifdef CONFIG_ARM_LPAE
    void (*set_pte_ext)(pte_t *ptep, pte_t pte);
#else
    void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
#endif

    /* Suspend/resume */
    unsigned int suspend_size;
    void (*do_suspend)(void *);
    void (*do_resume)(void *);
} processor;

#ifndef MULTI_CPU
extern void cpu_proc_init(void);
extern void cpu_proc_fin(void);
extern int cpu_do_idle(void);
extern void cpu_dcache_clean_area(void *, int);
extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
#ifdef CONFIG_ARM_LPAE
extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
#else
extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
#endif
extern void cpu_reset(unsigned long addr) __attribute__((noreturn));

/* These three are private to arch/arm/kernel/suspend.c */
extern void cpu_do_suspend(void *);
extern void cpu_do_resume(void *);
#else
#define cpu_proc_init           processor._proc_init
#define cpu_proc_fin            processor._proc_fin
#define cpu_reset           processor.reset
#define cpu_do_idle         processor._do_idle
#define cpu_dcache_clean_area       processor.dcache_clean_area
#define cpu_set_pte_ext         processor.set_pte_ext
#define cpu_do_switch_mm        processor.switch_mm

/* These three are private to arch/arm/kernel/suspend.c */
#define cpu_do_suspend          processor.do_suspend
#define cpu_do_resume           processor.do_resume
#endif

extern void cpu_resume(void);

#include <asm/memory.h>

#ifdef CONFIG_MMU

#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)

#ifdef CONFIG_ARM_LPAE
#define cpu_get_pgd()   \
    ({                      \
        unsigned long pg, pg2;          \
        __asm__("mrrc   p15, 0, %0, %1, c2" \
            : "=r" (pg), "=r" (pg2)     \
            :               \
            : "cc");            \
        pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);  \
        (pgd_t *)phys_to_virt(pg);      \
    })
#else
#define cpu_get_pgd()   \
    ({                      \
        unsigned long pg;           \
        __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
             : "=r" (pg) : : "cc");     \
        pg &= ~0x3fff;              \
        (pgd_t *)phys_to_virt(pg);      \
    })
#endif

#endif

#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __ASM_PROCFNS_H */