195 lines
4.8 KiB
C
195 lines
4.8 KiB
C
/*
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* arch/arm/include/asm/proc-fns.h
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*
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* Copyright (C) 1997-1999 Russell King
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_PROCFNS_H
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#define __ASM_PROCFNS_H
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#ifdef __KERNEL__
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#include <asm/glue-proc.h>
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#include <asm/page.h>
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#ifndef __ASSEMBLY__
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struct mm_struct;
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/*
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* Don't change this structure - ASM code relies on it.
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*/
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struct processor {
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/* MISC
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* get data abort address/flags
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*/
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void (*_data_abort)(unsigned long pc);
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/*
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* Retrieve prefetch fault address
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*/
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unsigned long (*_prefetch_abort)(unsigned long lr);
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/*
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* Set up any processor specifics
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*/
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void (*_proc_init)(void);
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/*
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* Check for processor bugs
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*/
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void (*check_bugs)(void);
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/*
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* Disable any processor specifics
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*/
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void (*_proc_fin)(void);
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/*
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* Special stuff for a reset
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*/
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void (*reset)(unsigned long addr, bool hvc) __attribute__((noreturn));
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/*
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* Idle the processor
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*/
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int (*_do_idle)(void);
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/*
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* Processor architecture specific
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*/
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/*
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* clean a virtual address range from the
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* D-cache without flushing the cache.
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*/
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void (*dcache_clean_area)(void *addr, int size);
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/*
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* Set the page table
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*/
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void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
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/*
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* Set a possibly extended PTE. Non-extended PTEs should
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* ignore 'ext'.
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*/
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#ifdef CONFIG_ARM_LPAE
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void (*set_pte_ext)(pte_t *ptep, pte_t pte);
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#else
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void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
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#endif
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/* Suspend/resume */
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unsigned int suspend_size;
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void (*do_suspend)(void *);
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void (*do_resume)(void *);
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};
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#ifndef MULTI_CPU
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static inline void init_proc_vtable(const struct processor *p)
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{
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}
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extern void cpu_proc_init(void);
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extern void cpu_proc_fin(void);
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extern int cpu_do_idle(void);
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extern void cpu_dcache_clean_area(void *, int);
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extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
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#ifdef CONFIG_ARM_LPAE
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extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
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#else
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extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
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#endif
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extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn));
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/* These three are private to arch/arm/kernel/suspend.c */
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extern void cpu_do_suspend(void *);
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extern void cpu_do_resume(void *);
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#else
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extern struct processor processor;
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#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
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#include <linux/smp.h>
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/*
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* This can't be a per-cpu variable because we need to access it before
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* per-cpu has been initialised. We have a couple of functions that are
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* called in a pre-emptible context, and so can't use smp_processor_id()
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* there, hence PROC_TABLE(). We insist in init_proc_vtable() that the
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* function pointers for these are identical across all CPUs.
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*/
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extern struct processor *cpu_vtable[];
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#define PROC_VTABLE(f) cpu_vtable[smp_processor_id()]->f
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#define PROC_TABLE(f) cpu_vtable[0]->f
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static inline void init_proc_vtable(const struct processor *p)
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{
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unsigned int cpu = smp_processor_id();
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*cpu_vtable[cpu] = *p;
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WARN_ON_ONCE(cpu_vtable[cpu]->dcache_clean_area !=
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cpu_vtable[0]->dcache_clean_area);
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WARN_ON_ONCE(cpu_vtable[cpu]->set_pte_ext !=
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cpu_vtable[0]->set_pte_ext);
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}
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#else
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#define PROC_VTABLE(f) processor.f
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#define PROC_TABLE(f) processor.f
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static inline void init_proc_vtable(const struct processor *p)
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{
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processor = *p;
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}
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#endif
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#define cpu_proc_init PROC_VTABLE(_proc_init)
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#define cpu_check_bugs PROC_VTABLE(check_bugs)
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#define cpu_proc_fin PROC_VTABLE(_proc_fin)
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#define cpu_reset PROC_VTABLE(reset)
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#define cpu_do_idle PROC_VTABLE(_do_idle)
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#define cpu_dcache_clean_area PROC_TABLE(dcache_clean_area)
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#define cpu_set_pte_ext PROC_TABLE(set_pte_ext)
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#define cpu_do_switch_mm PROC_VTABLE(switch_mm)
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/* These two are private to arch/arm/kernel/suspend.c */
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#define cpu_do_suspend PROC_VTABLE(do_suspend)
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#define cpu_do_resume PROC_VTABLE(do_resume)
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#endif
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extern void cpu_resume(void);
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#include <asm/memory.h>
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#ifdef CONFIG_MMU
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#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
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#ifdef CONFIG_ARM_LPAE
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#define cpu_get_ttbr(nr) \
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({ \
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u64 ttbr; \
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__asm__("mrrc p15, " #nr ", %Q0, %R0, c2" \
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: "=r" (ttbr)); \
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ttbr; \
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})
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#define cpu_get_pgd() \
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({ \
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u64 pg = cpu_get_ttbr(0); \
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pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1); \
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(pgd_t *)phys_to_virt(pg); \
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})
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#else
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#define cpu_get_pgd() \
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({ \
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unsigned long pg; \
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__asm__("mrc p15, 0, %0, c2, c0, 0" \
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: "=r" (pg) : : "cc"); \
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pg &= ~0x3fff; \
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(pgd_t *)phys_to_virt(pg); \
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})
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#endif
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#else /*!CONFIG_MMU */
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#define cpu_switch_mm(pgd,mm) { }
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* __ASM_PROCFNS_H */
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