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Diffstat (limited to 'arch/arm/include/asm/proc-fns.h')
| -rw-r--r-- | arch/arm/include/asm/proc-fns.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h new file mode 100644 index 000000000..c82f7a29e --- /dev/null +++ b/arch/arm/include/asm/proc-fns.h @@ -0,0 +1,191 @@ +/* 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); + +#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_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 &= ~0x3fff; \ + (pgd_t *)phys_to_virt(pg); \ + }) +#endif + +#else /*!CONFIG_MMU */ + +#define cpu_switch_mm(pgd,mm) { } + +#endif + +#endif /* __ASSEMBLY__ */ +#endif /* __KERNEL__ */ +#endif /* __ASM_PROCFNS_H */ |