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linux-headers-6.8.0-36-generic
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arch
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arm
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include
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asm
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proc-fns.h
/* 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 &= ~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 */
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