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/*
 * Copyright (c) 1991, 2016, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef	_VM_SEG_KP_IMPL_H
#define	_VM_SEG_KP_IMPL_H

#include <sys/types.h>
#include <sys/param.h>
#include <vm/seg.h>
#include <sys/vmem.h>
#include <sys/sysmacros.h>

#ifdef	__cplusplus
extern "C" {
#endif

#ifdef	_KERNEL

struct anon_map;

/*
 * A hash table is used to aid in the lookup of a kpd's based on vaddr.
 * Since the heaviest use of segkp occurs from segkp_*get and segkp_*release,
 * the hashing is based on the vaddr used by these routines.
 */
#define	SEGKP_HASHSHIFT		8
#define	SEGKP_HASHSZ		(1ul << SEGKP_HASHSHIFT)
#define	SEGKP_HASH(vaddr)	\
	((int)XOR8(((uintptr_t)vaddr >> PAGESHIFT), SEGKP_HASHSHIFT))

typedef struct segkp_data {
	kmutex_t	kp_lock;	/* per resource lock */
	caddr_t		kp_base;	/* starting addr of chunk */
	size_t		kp_len;		/* # of bytes */
	uint_t		kp_flags;	/* state info */
	int		kp_cookie;	/* index into cache array */
	struct anon_map	*kp_amp;	/* anon structs */
	struct segkp_data *kp_next;	/* cache list link */
	avl_node_t	kp_link;	/* AVL tree link */
} segkp_data_t;

/*
 * Private information per overall segkp segment (as opposed
 * to per resource within segment).
 */
typedef struct segkp_segdata {
	vmem_t		*kpsd_arena; 	/* virtual memory descriptor */
	avl_tree_t	*kpsd_hash;	/* hash table for lookups */
} segkp_segdata_t;

#define	SEGKP_VMEM(seg)	(((struct segkp_segdata *)(seg)->s_data)->kpsd_arena)

/*
 * A cache of segkp elements may be created via segkp_cache_init().
 * The elements on the freelist all have the same len and flags value.
 * The cookie passed to the client is an index into the freelist array.
 */
struct segkp_cache  {
	int		kpf_max;		/* max # of elements allowed */
	int		kpf_count;		/* current no. of elments */
	int		kpf_inuse;		/* list inuse */
	uint_t		kpf_flags;		/* seg_kp flag value */
	size_t		kpf_len;		/* len of resource */
	struct seg	*kpf_seg;		/* segment */
	struct segkp_data *kpf_list;		/* list of kpd's */
};
#define	SEGKP_MAX_CACHE		4	/* Number of caches maintained */

/*
 * The size of the unmapped "red zone" at the end of each kernel
 * thread's stack.  Note that several routines in seg_kp.c depend
 * implicitly on this size, so it would take a bit of work to change.
 */
#define	SEGKP_REDZONE_PAGES	1
#define	SEGKP_REDZONE_BYTES	(ptob(SEGKP_REDZONE_PAGES))

/*
 * Define redzone, and stack_to_memory macros.
 * The redzone is PAGESIZE bytes.
 */
#ifdef	STACK_GROWTH_DOWN
#define	KPD_REDZONE(kpd)	(0)
#define	stom(v, flags)	(((flags) & KPD_HASREDZONE) ? \
	(v) + SEGKP_REDZONE_BYTES : (v))

#else	/* STACK_GROWTH_DOWN */

#define	KPD_REDZONE(kpd) (btop(kpd->kp_len) - SEGKP_REDZONE_PAGES)
#define	stom(v)	(v)
#endif	/* STACK_GROWTH_DOWN */

#define	SEGKP_MAPLEN(len, flags) (((flags) & KPD_HASREDZONE) ? \
	(len) - SEGKP_REDZONE_BYTES : (len))

#endif	/* _KERNEL */

#ifdef	__cplusplus
}
#endif

#endif	/* _VM_SEG_KP_IMPL_H */