[mirror_ubuntu-artful-kernel.git] / include / asm-m32r / mmu_context.h

#ifndef _ASM_M32R_MMU_CONTEXT_H
#define _ASM_M32R_MMU_CONTEXT_H

#ifdef __KERNEL__


#include <asm/m32r.h>

#define MMU_CONTEXT_ASID_MASK      (0x000000FF)
#define MMU_CONTEXT_VERSION_MASK   (0xFFFFFF00)
#define MMU_CONTEXT_FIRST_VERSION  (0x00000100)
#define NO_CONTEXT                 (0x00000000)


#ifndef __ASSEMBLY__

#include <asm/atomic.h>
#include <asm/pgalloc.h>
#include <asm/mmu.h>
#include <asm/tlbflush.h>

/*
 * Cache of MMU context last used.
 */
#ifndef CONFIG_SMP
extern unsigned long mmu_context_cache_dat;
#define mmu_context_cache	mmu_context_cache_dat
#define mm_context(mm)		mm->context
#else /* not CONFIG_SMP */
extern unsigned long mmu_context_cache_dat[];
#define mmu_context_cache	mmu_context_cache_dat[smp_processor_id()]
#define mm_context(mm)		mm->context[smp_processor_id()]
#endif /* not CONFIG_SMP */

#define set_tlb_tag(entry, tag)		(*entry = (tag & PAGE_MASK)|get_asid())
#define set_tlb_data(entry, data)	(*entry = (data | _PAGE_PRESENT))

#ifdef CONFIG_MMU
#define enter_lazy_tlb(mm, tsk)	do { } while (0)

static inline void get_new_mmu_context(struct mm_struct *mm)
{
	unsigned long mc = ++mmu_context_cache;

	if (!(mc & MMU_CONTEXT_ASID_MASK)) {
		/* We exhaust ASID of this version.
		   Flush all TLB and start new cycle. */
		local_flush_tlb_all();
		/* Fix version if needed.
		   Note that we avoid version #0 to distingush NO_CONTEXT. */
		if (!mc)
			mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
	}
	mm_context(mm) = mc;
}

/*
 * Get MMU context if needed.
 */
static inline void get_mmu_context(struct mm_struct *mm)
{
	if (mm) {
		unsigned long mc = mmu_context_cache;

		/* Check if we have old version of context.
		   If it's old, we need to get new context with new version. */
		if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK)
			get_new_mmu_context(mm);
	}
}

/*
 * Initialize the context related info for a new mm_struct
 * instance.
 */
static inline int init_new_context(struct task_struct *tsk,
	struct mm_struct *mm)
{
#ifndef CONFIG_SMP
	mm->context = NO_CONTEXT;
#else /* CONFIG_SMP */
	int num_cpus = num_online_cpus();
	int i;

	for (i = 0 ; i < num_cpus ; i++)
		mm->context[i] = NO_CONTEXT;
#endif /* CONFIG_SMP */

	return 0;
}

/*
 * Destroy context related info for an mm_struct that is about
 * to be put to rest.
 */
#define destroy_context(mm)	do { } while (0)

static inline void set_asid(unsigned long asid)
{
	*(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK);
}

static inline unsigned long get_asid(void)
{
	unsigned long asid;

	asid = *(volatile long *)MASID;
	asid &= MMU_CONTEXT_ASID_MASK;

	return asid;
}

/*
 * After we have set current->mm to a new value, this activates
 * the context for the new mm so we see the new mappings.
 */
static inline void activate_context(struct mm_struct *mm)
{
	get_mmu_context(mm);
	set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK);
}

static inline void switch_mm(struct mm_struct *prev,
	struct mm_struct *next, struct task_struct *tsk)
{
#ifdef CONFIG_SMP
	int cpu = smp_processor_id();
#endif	/* CONFIG_SMP */

	if (prev != next) {
#ifdef CONFIG_SMP
		cpu_set(cpu, next->cpu_vm_mask);
#endif /* CONFIG_SMP */
		/* Set MPTB = next->pgd */
		*(volatile unsigned long *)MPTB = (unsigned long)next->pgd;
		activate_context(next);
	}
#ifdef CONFIG_SMP
	else
		if (!cpu_test_and_set(cpu, next->cpu_vm_mask))
			activate_context(next);
#endif /* CONFIG_SMP */
}

#define deactivate_mm(tsk, mm)	do { } while (0)

#define activate_mm(prev, next)	\
	switch_mm((prev), (next), NULL)

#else
#define get_mmu_context(mm)             do { } while (0)
#define init_new_context(tsk,mm)        (0)
#define destroy_context(mm)             do { } while (0)
#define set_asid(asid)                  do { } while (0)
#define get_asid()                      (0)
#define activate_context(mm)            do { } while (0)
#define switch_mm(prev,next,tsk)        do { } while (0)
#define deactivate_mm(mm,tsk)           do { } while (0)
#define activate_mm(prev,next)          do { } while (0)
#define enter_lazy_tlb(mm,tsk)          do { } while (0)
#endif /* CONFIG_MMU */


#endif /* not __ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_M32R_MMU_CONTEXT_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_M32R_MMU_CONTEXT_H
	2	#define _ASM_M32R_MMU_CONTEXT_H
	3
	4	#ifdef __KERNEL__
	5
1da177e4 LT	6
	7	#include <asm/m32r.h>
	8
	9	#define MMU_CONTEXT_ASID_MASK (0x000000FF)
	10	#define MMU_CONTEXT_VERSION_MASK (0xFFFFFF00)
	11	#define MMU_CONTEXT_FIRST_VERSION (0x00000100)
	12	#define NO_CONTEXT (0x00000000)
	13
	14
	15	#ifndef __ASSEMBLY__
	16
1da177e4 LT	17	#include <asm/atomic.h>
	18	#include <asm/pgalloc.h>
	19	#include <asm/mmu.h>
	20	#include <asm/tlbflush.h>
	21
	22	/*
	23	* Cache of MMU context last used.
	24	*/
	25	#ifndef CONFIG_SMP
	26	extern unsigned long mmu_context_cache_dat;
	27	#define mmu_context_cache mmu_context_cache_dat
	28	#define mm_context(mm) mm->context
	29	#else /* not CONFIG_SMP */
	30	extern unsigned long mmu_context_cache_dat[];
	31	#define mmu_context_cache mmu_context_cache_dat[smp_processor_id()]
	32	#define mm_context(mm) mm->context[smp_processor_id()]
	33	#endif /* not CONFIG_SMP */
	34
	35	#define set_tlb_tag(entry, tag) (*entry = (tag & PAGE_MASK)\|get_asid())
	36	#define set_tlb_data(entry, data) (*entry = (data \| _PAGE_PRESENT))
	37
	38	#ifdef CONFIG_MMU
	39	#define enter_lazy_tlb(mm, tsk) do { } while (0)
	40
	41	static inline void get_new_mmu_context(struct mm_struct *mm)
	42	{
	43	unsigned long mc = ++mmu_context_cache;
	44
	45	if (!(mc & MMU_CONTEXT_ASID_MASK)) {
	46	/* We exhaust ASID of this version.
	47	Flush all TLB and start new cycle. */
	48	local_flush_tlb_all();
	49	/* Fix version if needed.
	50	Note that we avoid version #0 to distingush NO_CONTEXT. */
	51	if (!mc)
	52	mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
	53	}
	54	mm_context(mm) = mc;
	55	}
	56
	57	/*
	58	* Get MMU context if needed.
	59	*/
	60	static inline void get_mmu_context(struct mm_struct *mm)
	61	{
	62	if (mm) {
	63	unsigned long mc = mmu_context_cache;
	64
	65	/* Check if we have old version of context.
	66	If it's old, we need to get new context with new version. */
	67	if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK)
	68	get_new_mmu_context(mm);
	69	}
	70	}
	71
	72	/*
	73	* Initialize the context related info for a new mm_struct
	74	* instance.
	75	*/
	76	static inline int init_new_context(struct task_struct *tsk,
	77	struct mm_struct *mm)
	78	{
	79	#ifndef CONFIG_SMP
	80	mm->context = NO_CONTEXT;
81	#else /* CONFIG_SMP */
82	int num_cpus = num_online_cpus();
83	int i;
84
85	for (i = 0 ; i < num_cpus ; i++)
86	mm->context[i] = NO_CONTEXT;
87	#endif /* CONFIG_SMP */
88
89	return 0;
90	}
91
92	/*
93	* Destroy context related info for an mm_struct that is about
94	* to be put to rest.
95	*/
96	#define destroy_context(mm) do { } while (0)
97
98	static inline void set_asid(unsigned long asid)
99	{
100	(volatile unsigned long )MASID = (asid & MMU_CONTEXT_ASID_MASK);
101	}
102
103	static inline unsigned long get_asid(void)
104	{
105	unsigned long asid;
106
107	asid = (volatile long )MASID;
108	asid &= MMU_CONTEXT_ASID_MASK;
109
110	return asid;
111	}
112
113	/*
114	* After we have set current->mm to a new value, this activates
115	* the context for the new mm so we see the new mappings.
116	*/
117	static inline void activate_context(struct mm_struct *mm)
118	{
119	get_mmu_context(mm);
120	set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK);
121	}
122
123	static inline void switch_mm(struct mm_struct *prev,
124	struct mm_struct next, struct task_struct tsk)
125	{
126	#ifdef CONFIG_SMP
127	int cpu = smp_processor_id();
128	#endif /* CONFIG_SMP */
129
130	if (prev != next) {
131	#ifdef CONFIG_SMP
132	cpu_set(cpu, next->cpu_vm_mask);
133	#endif /* CONFIG_SMP */
134	/* Set MPTB = next->pgd */
135	(volatile unsigned long )MPTB = (unsigned long)next->pgd;
136	activate_context(next);
137	}
138	#ifdef CONFIG_SMP
139	else
140	if (!cpu_test_and_set(cpu, next->cpu_vm_mask))
141	activate_context(next);
142	#endif /* CONFIG_SMP */
143	}
144
145	#define deactivate_mm(tsk, mm) do { } while (0)
146
147	#define activate_mm(prev, next) \
148	switch_mm((prev), (next), NULL)
149
150	#else
151	#define get_mmu_context(mm) do { } while (0)
152	#define init_new_context(tsk,mm) (0)
153	#define destroy_context(mm) do { } while (0)
154	#define set_asid(asid) do { } while (0)
155	#define get_asid() (0)
156	#define activate_context(mm) do { } while (0)
157	#define switch_mm(prev,next,tsk) do { } while (0)
158	#define deactivate_mm(mm,tsk) do { } while (0)
159	#define activate_mm(prev,next) do { } while (0)
160	#define enter_lazy_tlb(mm,tsk) do { } while (0)
161	#endif /* CONFIG_MMU */
162
163
164	#endif /* not __ASSEMBLY__ */
165
166	#endif /* __KERNEL__ */
167
168	#endif /* _ASM_M32R_MMU_CONTEXT_H */