/* SPDX-License-Identifier: GPL-2.0-only */
/*
* arch / arm / include / asm / proc - fns . h
*
* Copyright ( C ) 1997 - 1999 Russell King
* Copyright ( C ) 2000 Deep Blue Solutions Ltd
*/
#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 .
*/
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 );
/*
* Check for processor bugs
*/
void (*check_bugs)(void );
/*
* Disable any processor specifics
*/
void (*_proc_fin)(void );
/*
* Special stuff for a reset
*/
void (*reset)(unsigned long addr, bool hvc) __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)(phys_addr_t 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 *);
};
#ifndef MULTI_CPU
static inline void init_proc_vtable(const struct processor *p)
{
}
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(phys_addr_t 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, bool hvc) __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
extern struct processor processor;
#if defined (CONFIG_BIG_LITTLE) && defined (CONFIG_HARDEN_BRANCH_PREDICTOR)
#include <linux/smp.h>
/*
* This can ' t be a per - cpu variable because we need to access it before
* per - cpu has been initialised . We have a couple of functions that are
* called in a pre - emptible context , and so can ' t use smp_processor_id ( )
* there , hence PROC_TABLE ( ) . We insist in init_proc_vtable ( ) that the
* function pointers for these are identical across all CPUs .
*/
extern struct processor *cpu_vtable[];
#define PROC_VTABLE(f) cpu_vtable[smp_processor_id()]->f
#define PROC_TABLE(f) cpu_vtable[0 ]->f
static inline void init_proc_vtable(const struct processor *p)
{
unsigned int cpu = smp_processor_id();
*cpu_vtable[cpu] = *p;
WARN_ON_ONCE(cpu_vtable[cpu]->dcache_clean_area !=
cpu_vtable[0 ]->dcache_clean_area);
WARN_ON_ONCE(cpu_vtable[cpu]->set_pte_ext !=
cpu_vtable[0 ]->set_pte_ext);
}
#else
#define PROC_VTABLE(f) processor.f
#define PROC_TABLE(f) processor.f
static inline void init_proc_vtable(const struct processor *p)
{
processor = *p;
}
#endif
#define cpu_proc_init PROC_VTABLE(_proc_init)
#define cpu_check_bugs PROC_VTABLE(check_bugs)
#define cpu_proc_fin PROC_VTABLE(_proc_fin)
#define cpu_reset PROC_VTABLE(reset)
#define cpu_do_idle PROC_VTABLE(_do_idle)
#define cpu_dcache_clean_area PROC_TABLE(dcache_clean_area)
#define cpu_set_pte_ext PROC_TABLE(set_pte_ext)
#define cpu_do_switch_mm PROC_VTABLE(switch_mm)
/* These two are private to arch/arm/kernel/suspend.c */
#define cpu_do_suspend PROC_VTABLE(do_suspend)
#define cpu_do_resume PROC_VTABLE(do_resume)
#endif
extern void cpu_resume(void );
#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_ttbr(nr) \
({ \
u64 ttbr; \
__asm__("mrrc p15, " #nr ", %Q0, %R0, c2" \
: "=r" (ttbr)); \
ttbr; \
})
#define cpu_get_pgd() \
({ \
u64 pg = cpu_get_ttbr(0 ); \
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 &= ~0 x3fff; \
(pgd_t *)phys_to_virt(pg); \
})
#endif
static inline unsigned int cpu_get_ttbcr(void )
{
unsigned int ttbcr;
asm ("mrc p15, 0, %0, c2, c0, 2" : "=r" (ttbcr));
return ttbcr;
}
static inline void cpu_set_ttbcr(unsigned int ttbcr)
{
asm volatile ("mcr p15, 0, %0, c2, c0, 2" : : "r" (ttbcr) : "memory" );
}
#else /*!CONFIG_MMU */
#define cpu_switch_mm(pgd,mm) { }
#endif
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __ASM_PROCFNS_H */
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