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/* SPDX-License-Identifier: GPL-2.0 */
#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 <linux/atomic.h>
#include <linux/mm_types.h>

#include <asm/pgalloc.h>
#include <asm/mmu.h>
#include <asm/tlbflush.h>
#include <asm-generic/mm_hooks.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 distinguish 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
		cpumask_set_cpu(cpu, mm_cpumask(next));
#endif /* CONFIG_SMP */
		/* Set MPTB = next->pgd */
		*(volatile unsigned long *)MPTB = (unsigned long)next->pgd;
		activate_context(next);
	}
#ifdef CONFIG_SMP
	else
		if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)))
			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 */

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Name Type Size Permission Actions
m32104ut Folder 0755
m32700ut Folder 0755
mappi2 Folder 0755
mappi3 Folder 0755
opsput Folder 0755
Kbuild File 318 B 0644
addrspace.h File 1.67 KB 0644
asm-offsets.h File 35 B 0644
assembler.h File 4.2 KB 0644
atomic.h File 6.29 KB 0644
barrier.h File 506 B 0644
bitops.h File 6.23 KB 0644
bug.h File 115 B 0644
bugs.h File 410 B 0644
cache.h File 222 B 0644
cachectl.h File 739 B 0644
cacheflush.h File 3.2 KB 0644
checksum.h File 4.83 KB 0644
cmpxchg.h File 4.86 KB 0644
dcache_clear.h File 1.01 KB 0644
delay.h File 31 B 0644
device.h File 148 B 0644
div64.h File 31 B 0644
dma-mapping.h File 570 B 0644
dma.h File 281 B 0644
elf.h File 3.64 KB 0644
emergency-restart.h File 188 B 0644
fb.h File 414 B 0644
flat.h File 4.2 KB 0644
ftrace.h File 12 B 0644
futex.h File 82 B 0644
hardirq.h File 214 B 0644
hw_irq.h File 87 B 0644
io.h File 6.44 KB 0644
irq.h File 2.94 KB 0644
irq_regs.h File 34 B 0644
irqflags.h File 2.24 KB 0644
kdebug.h File 32 B 0644
kmap_types.h File 251 B 0644
linkage.h File 177 B 0644
local.h File 7.8 KB 0644
local64.h File 33 B 0644
m32102.h File 14.71 KB 0644
m32r.h File 5.7 KB 0644
m32r_mp_fpga.h File 14.89 KB 0644
mc146818rtc.h File 671 B 0644
mmu.h File 403 B 0644
mmu_context.h File 4.23 KB 0644
mmzone.h File 1.29 KB 0644
page.h File 2.62 KB 0644
pci.h File 147 B 0644
percpu.h File 165 B 0644
pgalloc.h File 1.84 KB 0644
pgtable-2level.h File 2.31 KB 0644
pgtable.h File 9.7 KB 0644
processor.h File 2.93 KB 0644
ptrace.h File 1.3 KB 0644
rtc.h File 1.99 KB 0644
s1d13806.h File 9.84 KB 0644
segment.h File 228 B 0644
serial.h File 187 B 0644
setup.h File 1022 B 0644
shmparam.h File 197 B 0644
signal.h File 561 B 0644
smp.h File 3.5 KB 0644
spinlock.h File 7.15 KB 0644
spinlock_types.h File 520 B 0644
string.h File 378 B 0644
switch_to.h File 1.48 KB 0644
syscall.h File 252 B 0644
termios.h File 1.74 KB 0644
thread_info.h File 3.71 KB 0644
timex.h File 581 B 0644
tlb.h File 483 B 0644
tlbflush.h File 2.94 KB 0644
topology.h File 167 B 0644
types.h File 258 B 0644
uaccess.h File 15.3 KB 0644
ucontext.h File 321 B 0644
unaligned.h File 592 B 0644
unistd.h File 1.23 KB 0644
user.h File 2.1 KB 0644
vga.h File 436 B 0644
xor.h File 148 B 0644