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Linux/arch/arm/include/asm/proc-fns.h

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  1 /*
  2  *  arch/arm/include/asm/proc-fns.h
  3  *
  4  *  Copyright (C) 1997-1999 Russell King
  5  *  Copyright (C) 2000 Deep Blue Solutions Ltd
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 #ifndef __ASM_PROCFNS_H
 12 #define __ASM_PROCFNS_H
 13 
 14 #ifdef __KERNEL__
 15 
 16 #include <asm/glue-proc.h>
 17 #include <asm/page.h>
 18 
 19 #ifndef __ASSEMBLY__
 20 
 21 struct mm_struct;
 22 
 23 /*
 24  * Don't change this structure - ASM code relies on it.
 25  */
 26 struct processor {
 27         /* MISC
 28          * get data abort address/flags
 29          */
 30         void (*_data_abort)(unsigned long pc);
 31         /*
 32          * Retrieve prefetch fault address
 33          */
 34         unsigned long (*_prefetch_abort)(unsigned long lr);
 35         /*
 36          * Set up any processor specifics
 37          */
 38         void (*_proc_init)(void);
 39         /*
 40          * Check for processor bugs
 41          */
 42         void (*check_bugs)(void);
 43         /*
 44          * Disable any processor specifics
 45          */
 46         void (*_proc_fin)(void);
 47         /*
 48          * Special stuff for a reset
 49          */
 50         void (*reset)(unsigned long addr, bool hvc) __attribute__((noreturn));
 51         /*
 52          * Idle the processor
 53          */
 54         int (*_do_idle)(void);
 55         /*
 56          * Processor architecture specific
 57          */
 58         /*
 59          * clean a virtual address range from the
 60          * D-cache without flushing the cache.
 61          */
 62         void (*dcache_clean_area)(void *addr, int size);
 63 
 64         /*
 65          * Set the page table
 66          */
 67         void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
 68         /*
 69          * Set a possibly extended PTE.  Non-extended PTEs should
 70          * ignore 'ext'.
 71          */
 72 #ifdef CONFIG_ARM_LPAE
 73         void (*set_pte_ext)(pte_t *ptep, pte_t pte);
 74 #else
 75         void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
 76 #endif
 77 
 78         /* Suspend/resume */
 79         unsigned int suspend_size;
 80         void (*do_suspend)(void *);
 81         void (*do_resume)(void *);
 82 };
 83 
 84 #ifndef MULTI_CPU
 85 static inline void init_proc_vtable(const struct processor *p)
 86 {
 87 }
 88 
 89 extern void cpu_proc_init(void);
 90 extern void cpu_proc_fin(void);
 91 extern int cpu_do_idle(void);
 92 extern void cpu_dcache_clean_area(void *, int);
 93 extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
 94 #ifdef CONFIG_ARM_LPAE
 95 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
 96 #else
 97 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
 98 #endif
 99 extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn));
100 
101 /* These three are private to arch/arm/kernel/suspend.c */
102 extern void cpu_do_suspend(void *);
103 extern void cpu_do_resume(void *);
104 #else
105 
106 extern struct processor processor;
107 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
108 #include <linux/smp.h>
109 /*
110  * This can't be a per-cpu variable because we need to access it before
111  * per-cpu has been initialised.  We have a couple of functions that are
112  * called in a pre-emptible context, and so can't use smp_processor_id()
113  * there, hence PROC_TABLE().  We insist in init_proc_vtable() that the
114  * function pointers for these are identical across all CPUs.
115  */
116 extern struct processor *cpu_vtable[];
117 #define PROC_VTABLE(f)                  cpu_vtable[smp_processor_id()]->f
118 #define PROC_TABLE(f)                   cpu_vtable[0]->f
119 static inline void init_proc_vtable(const struct processor *p)
120 {
121         unsigned int cpu = smp_processor_id();
122         *cpu_vtable[cpu] = *p;
123         WARN_ON_ONCE(cpu_vtable[cpu]->dcache_clean_area !=
124                      cpu_vtable[0]->dcache_clean_area);
125         WARN_ON_ONCE(cpu_vtable[cpu]->set_pte_ext !=
126                      cpu_vtable[0]->set_pte_ext);
127 }
128 #else
129 #define PROC_VTABLE(f)                  processor.f
130 #define PROC_TABLE(f)                   processor.f
131 static inline void init_proc_vtable(const struct processor *p)
132 {
133         processor = *p;
134 }
135 #endif
136 
137 #define cpu_proc_init                   PROC_VTABLE(_proc_init)
138 #define cpu_check_bugs                  PROC_VTABLE(check_bugs)
139 #define cpu_proc_fin                    PROC_VTABLE(_proc_fin)
140 #define cpu_reset                       PROC_VTABLE(reset)
141 #define cpu_do_idle                     PROC_VTABLE(_do_idle)
142 #define cpu_dcache_clean_area           PROC_TABLE(dcache_clean_area)
143 #define cpu_set_pte_ext                 PROC_TABLE(set_pte_ext)
144 #define cpu_do_switch_mm                PROC_VTABLE(switch_mm)
145 
146 /* These two are private to arch/arm/kernel/suspend.c */
147 #define cpu_do_suspend                  PROC_VTABLE(do_suspend)
148 #define cpu_do_resume                   PROC_VTABLE(do_resume)
149 #endif
150 
151 extern void cpu_resume(void);
152 
153 #include <asm/memory.h>
154 
155 #ifdef CONFIG_MMU
156 
157 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
158 
159 #ifdef CONFIG_ARM_LPAE
160 
161 #define cpu_get_ttbr(nr)                                        \
162         ({                                                      \
163                 u64 ttbr;                                       \
164                 __asm__("mrrc   p15, " #nr ", %Q0, %R0, c2"     \
165                         : "=r" (ttbr));                         \
166                 ttbr;                                           \
167         })
168 
169 #define cpu_get_pgd()   \
170         ({                                              \
171                 u64 pg = cpu_get_ttbr(0);               \
172                 pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);  \
173                 (pgd_t *)phys_to_virt(pg);              \
174         })
175 #else
176 #define cpu_get_pgd()   \
177         ({                                              \
178                 unsigned long pg;                       \
179                 __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
180                          : "=r" (pg) : : "cc");         \
181                 pg &= ~0x3fff;                          \
182                 (pgd_t *)phys_to_virt(pg);              \
183         })
184 #endif
185 
186 #else   /*!CONFIG_MMU */
187 
188 #define cpu_switch_mm(pgd,mm)   { }
189 
190 #endif
191 
192 #endif /* __ASSEMBLY__ */
193 #endif /* __KERNEL__ */
194 #endif /* __ASM_PROCFNS_H */
195 

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