[mirror_ubuntu-bionic-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 /* not CONFIG_MMU */
#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 /* not 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
1da177e4 LT	2	#define _ASM_M32R_MMU_CONTEXT_H
1da177e4 LT	3	#ifdef __KERNEL__
1da177e4 LT	4
1da177e4 LT	5	#include <asm/m32r.h>
	6
	7	#define MMU_CONTEXT_ASID_MASK (0x000000FF)
	8	#define MMU_CONTEXT_VERSION_MASK (0xFFFFFF00)
	9	#define MMU_CONTEXT_FIRST_VERSION (0x00000100)
	10	#define NO_CONTEXT (0x00000000)
	11
1da177e4 LT	12	#ifndef __ASSEMBLY__
1da177e4 LT	13
1da177e4 LT	14	#include <asm/atomic.h>
	15	#include <asm/pgalloc.h>
	16	#include <asm/mmu.h>
	17	#include <asm/tlbflush.h>
	18
	19	/*
	20	* Cache of MMU context last used.
	21	*/
	22	#ifndef CONFIG_SMP
	23	extern unsigned long mmu_context_cache_dat;
	24	#define mmu_context_cache mmu_context_cache_dat
	25	#define mm_context(mm) mm->context
	26	#else /* not CONFIG_SMP */
	27	extern unsigned long mmu_context_cache_dat[];
	28	#define mmu_context_cache mmu_context_cache_dat[smp_processor_id()]
	29	#define mm_context(mm) mm->context[smp_processor_id()]
	30	#endif /* not CONFIG_SMP */
	31
	32	#define set_tlb_tag(entry, tag) (*entry = (tag & PAGE_MASK)\|get_asid())
	33	#define set_tlb_data(entry, data) (*entry = (data \| _PAGE_PRESENT))
	34
	35	#ifdef CONFIG_MMU
	36	#define enter_lazy_tlb(mm, tsk) do { } while (0)
	37
	38	static inline void get_new_mmu_context(struct mm_struct *mm)
	39	{
	40	unsigned long mc = ++mmu_context_cache;
	41
	42	if (!(mc & MMU_CONTEXT_ASID_MASK)) {
	43	/* We exhaust ASID of this version.
	44	Flush all TLB and start new cycle. */
	45	local_flush_tlb_all();
	46	/* Fix version if needed.
	47	Note that we avoid version #0 to distingush NO_CONTEXT. */
	48	if (!mc)
	49	mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
	50	}
	51	mm_context(mm) = mc;
	52	}
	53
	54	/*
	55	* Get MMU context if needed.
	56	*/
	57	static inline void get_mmu_context(struct mm_struct *mm)
	58	{
	59	if (mm) {
	60	unsigned long mc = mmu_context_cache;
	61
	62	/* Check if we have old version of context.
	63	If it's old, we need to get new context with new version. */
	64	if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK)
	65	get_new_mmu_context(mm);
	66	}
	67	}
	68
	69	/*
	70	* Initialize the context related info for a new mm_struct
	71	* instance.
	72	*/
	73	static inline int init_new_context(struct task_struct *tsk,
	74	struct mm_struct *mm)
	75	{
	76	#ifndef CONFIG_SMP
	77	mm->context = NO_CONTEXT;
78	#else /* CONFIG_SMP */
79	int num_cpus = num_online_cpus();
80	int i;
81
82	for (i = 0 ; i < num_cpus ; i++)
83	mm->context[i] = NO_CONTEXT;
84	#endif /* CONFIG_SMP */
85
86	return 0;
87	}
88
89	/*
90	* Destroy context related info for an mm_struct that is about
91	* to be put to rest.
92	*/
93	#define destroy_context(mm) do { } while (0)
94
95	static inline void set_asid(unsigned long asid)
96	{
97	(volatile unsigned long )MASID = (asid & MMU_CONTEXT_ASID_MASK);
98	}
99
100	static inline unsigned long get_asid(void)
101	{
102	unsigned long asid;
103
104	asid = (volatile long )MASID;
105	asid &= MMU_CONTEXT_ASID_MASK;
106
107	return asid;
108	}
109
110	/*
111	* After we have set current->mm to a new value, this activates
112	* the context for the new mm so we see the new mappings.
113	*/
114	static inline void activate_context(struct mm_struct *mm)
115	{
116	get_mmu_context(mm);
117	set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK);
118	}
119
120	static inline void switch_mm(struct mm_struct *prev,
121	struct mm_struct next, struct task_struct tsk)
122	{
123	#ifdef CONFIG_SMP
124	int cpu = smp_processor_id();
125	#endif /* CONFIG_SMP */
126
127	if (prev != next) {
128	#ifdef CONFIG_SMP
129	cpu_set(cpu, next->cpu_vm_mask);
130	#endif /* CONFIG_SMP */
131	/* Set MPTB = next->pgd */
132	(volatile unsigned long )MPTB = (unsigned long)next->pgd;
133	activate_context(next);
134	}
135	#ifdef CONFIG_SMP
136	else
137	if (!cpu_test_and_set(cpu, next->cpu_vm_mask))
138	activate_context(next);
139	#endif /* CONFIG_SMP */
140	}
141
142	#define deactivate_mm(tsk, mm) do { } while (0)
143
144	#define activate_mm(prev, next) \
145	switch_mm((prev), (next), NULL)
146
fabb626a	147	#else /* not CONFIG_MMU */
1da177e4 LT	148	#define get_mmu_context(mm) do { } while (0)
	149	#define init_new_context(tsk,mm) (0)
	150	#define destroy_context(mm) do { } while (0)
	151	#define set_asid(asid) do { } while (0)
	152	#define get_asid() (0)
	153	#define activate_context(mm) do { } while (0)
	154	#define switch_mm(prev,next,tsk) do { } while (0)
	155	#define deactivate_mm(mm,tsk) do { } while (0)
	156	#define activate_mm(prev,next) do { } while (0)
	157	#define enter_lazy_tlb(mm,tsk) do { } while (0)
fabb626a	158	#endif /* not CONFIG_MMU */
1da177e4 LT	159
	160	#endif /* not __ASSEMBLY__ */
	161
	162	#endif /* __KERNEL__ */
1da177e4	163	#endif /* _ASM_M32R_MMU_CONTEXT_H */