arch/powerpc/include/asm/book3s/64/mmu-hash.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/book3s/64/mmu-hash.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/book3s/64/mmu-hash.h
Extension
.h
Size
28921 bytes
Lines
885
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct mmu_hash_ops {
	void            (*hpte_invalidate)(unsigned long slot,
					   unsigned long vpn,
					   int bpsize, int apsize,
					   int ssize, int local);
	long		(*hpte_updatepp)(unsigned long slot,
					 unsigned long newpp,
					 unsigned long vpn,
					 int bpsize, int apsize,
					 int ssize, unsigned long flags);
	void            (*hpte_updateboltedpp)(unsigned long newpp,
					       unsigned long ea,
					       int psize, int ssize);
	long		(*hpte_insert)(unsigned long hpte_group,
				       unsigned long vpn,
				       unsigned long prpn,
				       unsigned long rflags,
				       unsigned long vflags,
				       int psize, int apsize,
				       int ssize);
	long		(*hpte_remove)(unsigned long hpte_group);
	int             (*hpte_removebolted)(unsigned long ea,
					     int psize, int ssize);
	void		(*flush_hash_range)(unsigned long number, int local);
	void		(*hugepage_invalidate)(unsigned long vsid,
					       unsigned long addr,
					       unsigned char *hpte_slot_array,
					       int psize, int ssize, int local);
	int		(*resize_hpt)(unsigned long shift);
	/*
	 * Special for kexec.
	 * To be called in real mode with interrupts disabled. No locks are
	 * taken as such, concurrent access on pre POWER5 hardware could result
	 * in a deadlock.
	 * The linear mapping is destroyed as well.
	 */
	void		(*hpte_clear_all)(void);
};
extern struct mmu_hash_ops mmu_hash_ops;

struct hash_pte {
	__be64 v;
	__be64 r;
};

extern struct hash_pte *htab_address;
extern unsigned long htab_size_bytes;
extern unsigned long htab_hash_mask;


static inline int shift_to_mmu_psize(unsigned int shift)
{
	int psize;

	for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
		if (mmu_psize_defs[psize].shift == shift)
			return psize;
	return -1;
}

static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
{
	if (mmu_psize_defs[mmu_psize].shift)
		return mmu_psize_defs[mmu_psize].shift;
	BUG();
}

static inline unsigned int ap_to_shift(unsigned long ap)
{
	int psize;

	for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
		if (mmu_psize_defs[psize].ap == ap)
			return mmu_psize_defs[psize].shift;
	}

	return -1;
}

static inline unsigned long get_sllp_encoding(int psize)
{
	unsigned long sllp;

	sllp = ((mmu_psize_defs[psize].sllp & SLB_VSID_L) >> 6) |
		((mmu_psize_defs[psize].sllp & SLB_VSID_LP) >> 4);
	return sllp;
}

#endif /* __ASSEMBLER__ */

Annotation

Implementation Notes