1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/include/asm/proc-fns.h
4 *
5 * Copyright (C) 1997-1999 Russell King
6 * Copyright (C) 2000 Deep Blue Solutions Ltd
7 */
8 #ifndef __ASM_PROCFNS_H
9 #define __ASM_PROCFNS_H
10
11 #ifdef __KERNEL__
12
13 #include <asm/glue-proc.h>
14 #include <asm/page.h>
15
16 #ifndef __ASSEMBLY__
17
18 struct mm_struct;
19
20 /*
21 * Don't change this structure - ASM code relies on it.
22 */
23 struct processor {
24 /* MISC
25 * get data abort address/flags
26 */
27 void (*_data_abort)(unsigned long pc);
28 /*
29 * Retrieve prefetch fault address
30 */
31 unsigned long (*_prefetch_abort)(unsigned long lr);
32 /*
33 * Set up any processor specifics
34 */
35 void (*_proc_init)(void);
36 /*
37 * Check for processor bugs
38 */
39 void (*check_bugs)(void);
40 /*
41 * Disable any processor specifics
42 */
43 void (*_proc_fin)(void);
44 /*
45 * Special stuff for a reset
46 */
47 void (*reset)(unsigned long addr, bool hvc) __attribute__((noreturn));
48 /*
49 * Idle the processor
50 */
51 int (*_do_idle)(void);
52 /*
53 * Processor architecture specific
54 */
55 /*
56 * clean a virtual address range from the
57 * D-cache without flushing the cache.
58 */
59 void (*dcache_clean_area)(void *addr, int size);
60
61 /*
62 * Set the page table
63 */
64 void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
65 /*
66 * Set a possibly extended PTE. Non-extended PTEs should
67 * ignore 'ext'.
68 */
69 #ifdef CONFIG_ARM_LPAE
70 void (*set_pte_ext)(pte_t *ptep, pte_t pte);
71 #else
72 void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
73 #endif
74
75 /* Suspend/resume */
76 unsigned int suspend_size;
77 void (*do_suspend)(void *);
78 void (*do_resume)(void *);
79 };
80
81 #ifndef MULTI_CPU
init_proc_vtable(const struct processor * p)82 static inline void init_proc_vtable(const struct processor *p)
83 {
84 }
85
86 extern void cpu_proc_init(void);
87 extern void cpu_proc_fin(void);
88 extern int cpu_do_idle(void);
89 extern void cpu_dcache_clean_area(void *, int);
90 extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
91 #ifdef CONFIG_ARM_LPAE
92 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
93 #else
94 extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
95 #endif
96 extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn));
97
98 /* These three are private to arch/arm/kernel/suspend.c */
99 extern void cpu_do_suspend(void *);
100 extern void cpu_do_resume(void *);
101 #else
102
103 extern struct processor processor;
104 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
105 #include <linux/smp.h>
106 /*
107 * This can't be a per-cpu variable because we need to access it before
108 * per-cpu has been initialised. We have a couple of functions that are
109 * called in a pre-emptible context, and so can't use smp_processor_id()
110 * there, hence PROC_TABLE(). We insist in init_proc_vtable() that the
111 * function pointers for these are identical across all CPUs.
112 */
113 extern struct processor *cpu_vtable[];
114 #define PROC_VTABLE(f) cpu_vtable[smp_processor_id()]->f
115 #define PROC_TABLE(f) cpu_vtable[0]->f
init_proc_vtable(const struct processor * p)116 static inline void init_proc_vtable(const struct processor *p)
117 {
118 unsigned int cpu = smp_processor_id();
119 *cpu_vtable[cpu] = *p;
120 WARN_ON_ONCE(cpu_vtable[cpu]->dcache_clean_area !=
121 cpu_vtable[0]->dcache_clean_area);
122 WARN_ON_ONCE(cpu_vtable[cpu]->set_pte_ext !=
123 cpu_vtable[0]->set_pte_ext);
124 }
125 #else
126 #define PROC_VTABLE(f) processor.f
127 #define PROC_TABLE(f) processor.f
init_proc_vtable(const struct processor * p)128 static inline void init_proc_vtable(const struct processor *p)
129 {
130 processor = *p;
131 }
132 #endif
133
134 #define cpu_proc_init PROC_VTABLE(_proc_init)
135 #define cpu_check_bugs PROC_VTABLE(check_bugs)
136 #define cpu_proc_fin PROC_VTABLE(_proc_fin)
137 #define cpu_reset PROC_VTABLE(reset)
138 #define cpu_do_idle PROC_VTABLE(_do_idle)
139 #define cpu_dcache_clean_area PROC_TABLE(dcache_clean_area)
140 #define cpu_set_pte_ext PROC_TABLE(set_pte_ext)
141 #define cpu_do_switch_mm PROC_VTABLE(switch_mm)
142
143 /* These two are private to arch/arm/kernel/suspend.c */
144 #define cpu_do_suspend PROC_VTABLE(do_suspend)
145 #define cpu_do_resume PROC_VTABLE(do_resume)
146 #endif
147
148 extern void cpu_resume(void);
149
150 #ifdef CONFIG_MMU
151
152 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
153
154 #ifdef CONFIG_ARM_LPAE
155
156 #define cpu_get_ttbr(nr) \
157 ({ \
158 u64 ttbr; \
159 __asm__("mrrc p15, " #nr ", %Q0, %R0, c2" \
160 : "=r" (ttbr)); \
161 ttbr; \
162 })
163
164 #define cpu_get_pgd() \
165 ({ \
166 u64 pg = cpu_get_ttbr(0); \
167 pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1); \
168 (pgd_t *)phys_to_virt(pg); \
169 })
170 #else
171 #define cpu_get_pgd() \
172 ({ \
173 unsigned long pg; \
174 __asm__("mrc p15, 0, %0, c2, c0, 0" \
175 : "=r" (pg) : : "cc"); \
176 pg &= ~0x3fff; \
177 (pgd_t *)phys_to_virt(pg); \
178 })
179 #endif
180
181 #else /*!CONFIG_MMU */
182
183 #define cpu_switch_mm(pgd,mm) { }
184
185 #endif
186
187 #endif /* __ASSEMBLY__ */
188 #endif /* __KERNEL__ */
189 #endif /* __ASM_PROCFNS_H */
190