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
21struct mm_struct;
22
23/*
24 * Don't change this structure - ASM code relies on it.
25 */
26extern 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	 * Disable any processor specifics
41	 */
42	void (*_proc_fin)(void);
43	/*
44	 * Special stuff for a reset
45	 */
46	void (*reset)(unsigned long addr) __attribute__((noreturn));
47	/*
48	 * Idle the processor
49	 */
50	int (*_do_idle)(void);
51	/*
52	 * Processor architecture specific
53	 */
54	/*
55	 * clean a virtual address range from the
56	 * D-cache without flushing the cache.
57	 */
58	void (*dcache_clean_area)(void *addr, int size);
59
60	/*
61	 * Set the page table
62	 */
63	void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm);
64	/*
65	 * Set a possibly extended PTE.  Non-extended PTEs should
66	 * ignore 'ext'.
67	 */
68#ifdef CONFIG_ARM_LPAE
69	void (*set_pte_ext)(pte_t *ptep, pte_t pte);
70#else
71	void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
72#endif
73
74	/* Suspend/resume */
75	unsigned int suspend_size;
76	void (*do_suspend)(void *);
77	void (*do_resume)(void *);
78} processor;
79
80#ifndef MULTI_CPU
81extern void cpu_proc_init(void);
82extern void cpu_proc_fin(void);
83extern int cpu_do_idle(void);
84extern void cpu_dcache_clean_area(void *, int);
85extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
86#ifdef CONFIG_ARM_LPAE
87extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
88#else
89extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
90#endif
91extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
92
93/* These three are private to arch/arm/kernel/suspend.c */
94extern void cpu_do_suspend(void *);
95extern void cpu_do_resume(void *);
96#else
97#define cpu_proc_init			processor._proc_init
98#define cpu_proc_fin			processor._proc_fin
99#define cpu_reset			processor.reset
100#define cpu_do_idle			processor._do_idle
101#define cpu_dcache_clean_area		processor.dcache_clean_area
102#define cpu_set_pte_ext			processor.set_pte_ext
103#define cpu_do_switch_mm		processor.switch_mm
104
105/* These three are private to arch/arm/kernel/suspend.c */
106#define cpu_do_suspend			processor.do_suspend
107#define cpu_do_resume			processor.do_resume
108#endif
109
110extern void cpu_resume(void);
111
112#include <asm/memory.h>
113
114#ifdef CONFIG_MMU
115
116#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
117
118#ifdef CONFIG_ARM_LPAE
119
120#define cpu_get_ttbr(nr)					\
121	({							\
122		u64 ttbr;					\
123		__asm__("mrrc	p15, " #nr ", %Q0, %R0, c2"	\
124			: "=r" (ttbr));				\
125		ttbr;						\
126	})
127
128#define cpu_set_ttbr(nr, val)					\
129	do {							\
130		u64 ttbr = val;					\
131		__asm__("mcrr	p15, " #nr ", %Q0, %R0, c2"	\
132			: : "r" (ttbr));			\
133	} while (0)
134
135#define cpu_get_pgd()	\
136	({						\
137		u64 pg = cpu_get_ttbr(0);		\
138		pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);	\
139		(pgd_t *)phys_to_virt(pg);		\
140	})
141#else
142#define cpu_get_pgd()	\
143	({						\
144		unsigned long pg;			\
145		__asm__("mrc	p15, 0, %0, c2, c0, 0"	\
146			 : "=r" (pg) : : "cc");		\
147		pg &= ~0x3fff;				\
148		(pgd_t *)phys_to_virt(pg);		\
149	})
150#endif
151
152#else	/*!CONFIG_MMU */
153
154#define cpu_switch_mm(pgd,mm)	{ }
155
156#endif
157
158#endif /* __ASSEMBLY__ */
159#endif /* __KERNEL__ */
160#endif /* __ASM_PROCFNS_H */
161