/*
 * Linux OS Independent Layer
 *
 * Copyright (C) 1999-2016, Broadcom Corporation
 * 
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 * 
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 * 
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 *
 * $Id: linux_osl.c 658506 2016-09-08 06:44:19Z $
 */

#define LINUX_PORT

#include <typedefs.h>
#include <bcmendian.h>
#include <linuxver.h>
#include <bcmdefs.h>

#ifdef __ARM_ARCH_7A__
#include <asm/cacheflush.h>
#endif /* __ARM_ARCH_7A__ */

#include <osl.h>
#include <bcmutils.h>
#include <linux/delay.h>
#include <pcicfg.h>


#include <linux/fs.h>

#define PCI_CFG_RETRY		10

#define OS_HANDLE_MAGIC		0x1234abcd	/* Magic # to recognize osh */
#define BCM_MEM_FILENAME_LEN	24		/* Mem. filename length */
#define DUMPBUFSZ 1024

#ifdef CONFIG_DHD_USE_STATIC_BUF
#define DHD_SKB_HDRSIZE		336
#define DHD_SKB_1PAGE_BUFSIZE	((PAGE_SIZE*1)-DHD_SKB_HDRSIZE)
#define DHD_SKB_2PAGE_BUFSIZE	((PAGE_SIZE*2)-DHD_SKB_HDRSIZE)
#define DHD_SKB_4PAGE_BUFSIZE	((PAGE_SIZE*4)-DHD_SKB_HDRSIZE)

#define STATIC_BUF_MAX_NUM	16
#define STATIC_BUF_SIZE	(PAGE_SIZE*2)
#define STATIC_BUF_TOTAL_LEN	(STATIC_BUF_MAX_NUM * STATIC_BUF_SIZE)

typedef struct bcm_static_buf {
	spinlock_t static_lock;
	unsigned char *buf_ptr;
	unsigned char buf_use[STATIC_BUF_MAX_NUM];
} bcm_static_buf_t;

static bcm_static_buf_t *bcm_static_buf = 0;

#define STATIC_PKT_MAX_NUM	8
#if defined(ENHANCED_STATIC_BUF)
#define STATIC_PKT_4PAGE_NUM	1
#define DHD_SKB_MAX_BUFSIZE	DHD_SKB_4PAGE_BUFSIZE
#else
#define STATIC_PKT_4PAGE_NUM	0
#define DHD_SKB_MAX_BUFSIZE DHD_SKB_2PAGE_BUFSIZE
#endif /* ENHANCED_STATIC_BUF */

typedef struct bcm_static_pkt {
	struct sk_buff *skb_4k[STATIC_PKT_MAX_NUM];
	struct sk_buff *skb_8k[STATIC_PKT_MAX_NUM];
#ifdef ENHANCED_STATIC_BUF
	struct sk_buff *skb_16k;
#endif
	struct semaphore osl_pkt_sem;
	unsigned char pkt_use[STATIC_PKT_MAX_NUM * 2 + STATIC_PKT_4PAGE_NUM];
} bcm_static_pkt_t;

static bcm_static_pkt_t *bcm_static_skb = 0;

void* wifi_platform_prealloc(void *adapter, int section, unsigned long size);
#endif /* CONFIG_DHD_USE_STATIC_BUF */

typedef struct bcm_mem_link {
	struct bcm_mem_link *prev;
	struct bcm_mem_link *next;
	uint	size;
	int	line;
	void 	*osh;
	char	file[BCM_MEM_FILENAME_LEN];
} bcm_mem_link_t;

struct osl_cmn_info {
	atomic_t malloced;
	atomic_t pktalloced;    /* Number of allocated packet buffers */
	spinlock_t dbgmem_lock;
	bcm_mem_link_t *dbgmem_list;
	spinlock_t pktalloc_lock;
	atomic_t refcount; /* Number of references to this shared structure. */
};
typedef struct osl_cmn_info osl_cmn_t;

struct osl_info {
	osl_pubinfo_t pub;
#ifdef CTFPOOL
	ctfpool_t *ctfpool;
#endif /* CTFPOOL */
	uint magic;
	void *pdev;
	uint failed;
	uint bustype;
	osl_cmn_t *cmn; /* Common OSL related data shred between two OSH's */

	void *bus_handle;
#ifdef BCMDBG_CTRACE
	spinlock_t ctrace_lock;
	struct list_head ctrace_list;
	int ctrace_num;
#endif /* BCMDBG_CTRACE */
};

#define OSL_PKTTAG_CLEAR(p) \
do { \
	struct sk_buff *s = (struct sk_buff *)(p); \
	ASSERT(OSL_PKTTAG_SZ == 32); \
	*(uint32 *)(&s->cb[0]) = 0; *(uint32 *)(&s->cb[4]) = 0; \
	*(uint32 *)(&s->cb[8]) = 0; *(uint32 *)(&s->cb[12]) = 0; \
	*(uint32 *)(&s->cb[16]) = 0; *(uint32 *)(&s->cb[20]) = 0; \
	*(uint32 *)(&s->cb[24]) = 0; *(uint32 *)(&s->cb[28]) = 0; \
} while (0)

/* PCMCIA attribute space access macros */

/* Global ASSERT type flag */
uint32 g_assert_type = FALSE;

static int16 linuxbcmerrormap[] =
{	0, 			/* 0 */
	-EINVAL,		/* BCME_ERROR */
	-EINVAL,		/* BCME_BADARG */
	-EINVAL,		/* BCME_BADOPTION */
	-EINVAL,		/* BCME_NOTUP */
	-EINVAL,		/* BCME_NOTDOWN */
	-EINVAL,		/* BCME_NOTAP */
	-EINVAL,		/* BCME_NOTSTA */
	-EINVAL,		/* BCME_BADKEYIDX */
	-EINVAL,		/* BCME_RADIOOFF */
	-EINVAL,		/* BCME_NOTBANDLOCKED */
	-EINVAL, 		/* BCME_NOCLK */
	-EINVAL, 		/* BCME_BADRATESET */
	-EINVAL, 		/* BCME_BADBAND */
	-E2BIG,			/* BCME_BUFTOOSHORT */
	-E2BIG,			/* BCME_BUFTOOLONG */
	-EBUSY, 		/* BCME_BUSY */
	-EINVAL, 		/* BCME_NOTASSOCIATED */
	-EINVAL, 		/* BCME_BADSSIDLEN */
	-EINVAL, 		/* BCME_OUTOFRANGECHAN */
	-EINVAL, 		/* BCME_BADCHAN */
	-EFAULT, 		/* BCME_BADADDR */
	-ENOMEM, 		/* BCME_NORESOURCE */
	-EOPNOTSUPP,		/* BCME_UNSUPPORTED */
	-EMSGSIZE,		/* BCME_BADLENGTH */
	-EINVAL,		/* BCME_NOTREADY */
	-EPERM,			/* BCME_EPERM */
	-ENOMEM, 		/* BCME_NOMEM */
	-EINVAL, 		/* BCME_ASSOCIATED */
	-ERANGE, 		/* BCME_RANGE */
	-EINVAL, 		/* BCME_NOTFOUND */
	-EINVAL, 		/* BCME_WME_NOT_ENABLED */
	-EINVAL, 		/* BCME_TSPEC_NOTFOUND */
	-EINVAL, 		/* BCME_ACM_NOTSUPPORTED */
	-EINVAL,		/* BCME_NOT_WME_ASSOCIATION */
	-EIO,			/* BCME_SDIO_ERROR */
	-ENODEV,		/* BCME_DONGLE_DOWN */
	-EINVAL,		/* BCME_VERSION */
	-EIO,			/* BCME_TXFAIL */
	-EIO,			/* BCME_RXFAIL */
	-ENODEV,		/* BCME_NODEVICE */
	-EINVAL,		/* BCME_NMODE_DISABLED */
	-ENODATA,		/* BCME_NONRESIDENT */
	-EINVAL,		/* BCME_SCANREJECT */
	-EINVAL,		/* BCME_USAGE_ERROR */
	-EIO,     		/* BCME_IOCTL_ERROR */
	-EIO,			/* BCME_SERIAL_PORT_ERR */
	-EOPNOTSUPP,	/* BCME_DISABLED, BCME_NOTENABLED */
	-EIO,			/* BCME_DECERR */
	-EIO,			/* BCME_ENCERR */
	-EIO,			/* BCME_MICERR */
	-ERANGE,		/* BCME_REPLAY */
	-EINVAL,		/* BCME_IE_NOTFOUND */

/* When an new error code is added to bcmutils.h, add os
 * specific error translation here as well
 */
/* check if BCME_LAST changed since the last time this function was updated */
#if BCME_LAST != -52
#error "You need to add a OS error translation in the linuxbcmerrormap \
	for new error code defined in bcmutils.h"
#endif
};

/* translate bcmerrors into linux errors */
int
osl_error(int bcmerror)
{
	if (bcmerror > 0)
		bcmerror = 0;
	else if (bcmerror < BCME_LAST)
		bcmerror = BCME_ERROR;

	/* Array bounds covered by ASSERT in osl_attach */
	return linuxbcmerrormap[-bcmerror];
}
#ifdef SHARED_OSL_CMN
osl_t *
osl_attach(void *pdev, uint bustype, bool pkttag, void **osl_cmn)
{
#else
osl_t *
osl_attach(void *pdev, uint bustype, bool pkttag)
{
	void **osl_cmn = NULL;
#endif /* SHARED_OSL_CMN */
	osl_t *osh;
	gfp_t flags;

	flags = CAN_SLEEP() ? GFP_KERNEL: GFP_ATOMIC;
	if (!(osh = kmalloc(sizeof(osl_t), flags)))
		return osh;

	ASSERT(osh);

	bzero(osh, sizeof(osl_t));

	if (osl_cmn == NULL || *osl_cmn == NULL) {
		if (!(osh->cmn = kmalloc(sizeof(osl_cmn_t), flags))) {
			kfree(osh);
			return NULL;
		}
		bzero(osh->cmn, sizeof(osl_cmn_t));
		if (osl_cmn)
			*osl_cmn = osh->cmn;
		atomic_set(&osh->cmn->malloced, 0);
		osh->cmn->dbgmem_list = NULL;
		spin_lock_init(&(osh->cmn->dbgmem_lock));

		spin_lock_init(&(osh->cmn->pktalloc_lock));

	} else {
		osh->cmn = *osl_cmn;
	}
	atomic_add(1, &osh->cmn->refcount);

	/* Check that error map has the right number of entries in it */
	ASSERT(ABS(BCME_LAST) == (ARRAYSIZE(linuxbcmerrormap) - 1));

	osh->failed = 0;
	osh->pdev = pdev;
	osh->pub.pkttag = pkttag;
	osh->bustype = bustype;
	osh->magic = OS_HANDLE_MAGIC;

	switch (bustype) {
		case PCI_BUS:
		case SI_BUS:
		case PCMCIA_BUS:
			osh->pub.mmbus = TRUE;
			break;
		case JTAG_BUS:
		case SDIO_BUS:
		case USB_BUS:
		case SPI_BUS:
		case RPC_BUS:
			osh->pub.mmbus = FALSE;
			break;
		default:
			ASSERT(FALSE);
			break;
	}

#ifdef BCMDBG_CTRACE
	spin_lock_init(&osh->ctrace_lock);
	INIT_LIST_HEAD(&osh->ctrace_list);
	osh->ctrace_num = 0;
#endif /* BCMDBG_CTRACE */


	return osh;
}

int osl_static_mem_init(osl_t *osh, void *adapter)
{
#if defined(CONFIG_DHD_USE_STATIC_BUF)
		if (!bcm_static_buf && adapter) {
			if (!(bcm_static_buf = (bcm_static_buf_t *)wifi_platform_prealloc(adapter,
				3, STATIC_BUF_SIZE + STATIC_BUF_TOTAL_LEN))) {
				printk("can not alloc static buf!\n");
				bcm_static_skb = NULL;
				ASSERT(osh->magic == OS_HANDLE_MAGIC);
				kfree(osh);
				return -ENOMEM;
			} else {
				printk("alloc static buf at %p!\n", bcm_static_buf);
			}

			spin_lock_init(&bcm_static_buf->static_lock);

			bcm_static_buf->buf_ptr = (unsigned char *)bcm_static_buf + STATIC_BUF_SIZE;
		}

		if (!bcm_static_skb && adapter) {
			int i;
			void *skb_buff_ptr = 0;
			bcm_static_skb = (bcm_static_pkt_t *)((char *)bcm_static_buf + 2048);
			skb_buff_ptr = wifi_platform_prealloc(adapter, 4, 0);
			if (!skb_buff_ptr) {
				printk("cannot alloc static buf!\n");
				bcm_static_buf = NULL;
				bcm_static_skb = NULL;
				ASSERT(osh->magic == OS_HANDLE_MAGIC);
				kfree(osh);
				return -ENOMEM;
			}

			bcopy(skb_buff_ptr, bcm_static_skb, sizeof(struct sk_buff *) *
				(STATIC_PKT_MAX_NUM * 2 + STATIC_PKT_4PAGE_NUM));
			for (i = 0; i < STATIC_PKT_MAX_NUM * 2 + STATIC_PKT_4PAGE_NUM; i++)
				bcm_static_skb->pkt_use[i] = 0;

			sema_init(&bcm_static_skb->osl_pkt_sem, 1);
		}
#endif /* CONFIG_DHD_USE_STATIC_BUF */

	return 0;
}

void osl_set_bus_handle(osl_t *osh, void *bus_handle)
{
	osh->bus_handle = bus_handle;
}

void* osl_get_bus_handle(osl_t *osh)
{
	return osh->bus_handle;
}

void
osl_detach(osl_t *osh)
{
	if (osh == NULL)
		return;

	ASSERT(osh->magic == OS_HANDLE_MAGIC);
	atomic_sub(1, &osh->cmn->refcount);
	if (atomic_read(&osh->cmn->refcount) == 0) {
			kfree(osh->cmn);
	}
	kfree(osh);
}

int osl_static_mem_deinit(osl_t *osh, void *adapter)
{
#ifdef CONFIG_DHD_USE_STATIC_BUF
	if (bcm_static_buf) {
		bcm_static_buf = 0;
	}
	if (bcm_static_skb) {
		bcm_static_skb = 0;
	}
#endif
	return 0;
}

static struct sk_buff *osl_alloc_skb(osl_t *osh, unsigned int len)
{
	struct sk_buff *skb;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
	gfp_t flags = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL;
#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_ZONE_DMA)
	flags |= GFP_ATOMIC;
#endif
	skb = __dev_alloc_skb(len, flags);
#else
	skb = dev_alloc_skb(len);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) */
	return skb;
}

#ifdef CTFPOOL

#ifdef CTFPOOL_SPINLOCK
#define CTFPOOL_LOCK(ctfpool, flags)	spin_lock_irqsave(&(ctfpool)->lock, flags)
#define CTFPOOL_UNLOCK(ctfpool, flags)	spin_unlock_irqrestore(&(ctfpool)->lock, flags)
#else
#define CTFPOOL_LOCK(ctfpool, flags)	spin_lock_bh(&(ctfpool)->lock)
#define CTFPOOL_UNLOCK(ctfpool, flags)	spin_unlock_bh(&(ctfpool)->lock)
#endif /* CTFPOOL_SPINLOCK */
/*
 * Allocate and add an object to packet pool.
 */
void *
osl_ctfpool_add(osl_t *osh)
{
	struct sk_buff *skb;
#ifdef CTFPOOL_SPINLOCK
	unsigned long flags;
#endif /* CTFPOOL_SPINLOCK */

	if ((osh == NULL) || (osh->ctfpool == NULL))
		return NULL;

	CTFPOOL_LOCK(osh->ctfpool, flags);
	ASSERT(osh->ctfpool->curr_obj <= osh->ctfpool->max_obj);

	/* No need to allocate more objects */
	if (osh->ctfpool->curr_obj == osh->ctfpool->max_obj) {
		CTFPOOL_UNLOCK(osh->ctfpool, flags);
		return NULL;
	}

	/* Allocate a new skb and add it to the ctfpool */
	skb = osl_alloc_skb(osh, osh->ctfpool->obj_size);
	if (skb == NULL) {
		printf("%s: skb alloc of len %d failed\n", __FUNCTION__,
		       osh->ctfpool->obj_size);
		CTFPOOL_UNLOCK(osh->ctfpool, flags);
		return NULL;
	}

	/* Add to ctfpool */
	skb->next = (struct sk_buff *)osh->ctfpool->head;
	osh->ctfpool->head = skb;
	osh->ctfpool->fast_frees++;
	osh->ctfpool->curr_obj++;

	/* Hijack a skb member to store ptr to ctfpool */
	CTFPOOLPTR(osh, skb) = (void *)osh->ctfpool;

	/* Use bit flag to indicate skb from fast ctfpool */
	PKTFAST(osh, skb) = FASTBUF;

	CTFPOOL_UNLOCK(osh->ctfpool, flags);

	return skb;
}

/*
 * Add new objects to the pool.
 */
void
osl_ctfpool_replenish(osl_t *osh, uint thresh)
{
	if ((osh == NULL) || (osh->ctfpool == NULL))
		return;

	/* Do nothing if no refills are required */
	while ((osh->ctfpool->refills > 0) && (thresh--)) {
		osl_ctfpool_add(osh);
		osh->ctfpool->refills--;
	}
}

/*
 * Initialize the packet pool with specified number of objects.
 */
int32
osl_ctfpool_init(osl_t *osh, uint numobj, uint size)
{
	gfp_t flags;

	flags = CAN_SLEEP() ? GFP_KERNEL: GFP_ATOMIC;
	osh->ctfpool = kzalloc(sizeof(ctfpool_t), flags);
	ASSERT(osh->ctfpool);

	osh->ctfpool->max_obj = numobj;
	osh->ctfpool->obj_size = size;

	spin_lock_init(&osh->ctfpool->lock);

	while (numobj--) {
		if (!osl_ctfpool_add(osh))
			return -1;
		osh->ctfpool->fast_frees--;
	}

	return 0;
}

/*
 * Cleanup the packet pool objects.
 */
void
osl_ctfpool_cleanup(osl_t *osh)
{
	struct sk_buff *skb, *nskb;
#ifdef CTFPOOL_SPINLOCK
	unsigned long flags;
#endif /* CTFPOOL_SPINLOCK */

	if ((osh == NULL) || (osh->ctfpool == NULL))
		return;

	CTFPOOL_LOCK(osh->ctfpool, flags);

	skb = osh->ctfpool->head;

	while (skb != NULL) {
		nskb = skb->next;
		dev_kfree_skb(skb);
		skb = nskb;
		osh->ctfpool->curr_obj--;
	}

	ASSERT(osh->ctfpool->curr_obj == 0);
	osh->ctfpool->head = NULL;
	CTFPOOL_UNLOCK(osh->ctfpool, flags);

	kfree(osh->ctfpool);
	osh->ctfpool = NULL;
}

void
osl_ctfpool_stats(osl_t *osh, void *b)
{
	struct bcmstrbuf *bb;

	if ((osh == NULL) || (osh->ctfpool == NULL))
		return;

#ifdef CONFIG_DHD_USE_STATIC_BUF
	if (bcm_static_buf) {
		bcm_static_buf = 0;
	}
	if (bcm_static_skb) {
		bcm_static_skb = 0;
	}
#endif /* CONFIG_DHD_USE_STATIC_BUF */

	bb = b;

	ASSERT((osh != NULL) && (bb != NULL));

	bcm_bprintf(bb, "max_obj %d obj_size %d curr_obj %d refills %d\n",
	            osh->ctfpool->max_obj, osh->ctfpool->obj_size,
	            osh->ctfpool->curr_obj, osh->ctfpool->refills);
	bcm_bprintf(bb, "fast_allocs %d fast_frees %d slow_allocs %d\n",
	            osh->ctfpool->fast_allocs, osh->ctfpool->fast_frees,
	            osh->ctfpool->slow_allocs);
}

static inline struct sk_buff *
osl_pktfastget(osl_t *osh, uint len)
{
	struct sk_buff *skb;
#ifdef CTFPOOL_SPINLOCK
	unsigned long flags;
#endif /* CTFPOOL_SPINLOCK */

	/* Try to do fast allocate. Return null if ctfpool is not in use
	 * or if there are no items in the ctfpool.
	 */
	if (osh->ctfpool == NULL)
		return NULL;

	CTFPOOL_LOCK(osh->ctfpool, flags);
	if (osh->ctfpool->head == NULL) {
		ASSERT(osh->ctfpool->curr_obj == 0);
		osh->ctfpool->slow_allocs++;
		CTFPOOL_UNLOCK(osh->ctfpool, flags);
		return NULL;
	}

	if (len > osh->ctfpool->obj_size) {
		CTFPOOL_UNLOCK(osh->ctfpool, flags);
		return NULL;
	}

	ASSERT(len <= osh->ctfpool->obj_size);

	/* Get an object from ctfpool */
	skb = (struct sk_buff *)osh->ctfpool->head;
	osh->ctfpool->head = (void *)skb->next;

	osh->ctfpool->fast_allocs++;
	osh->ctfpool->curr_obj--;
	ASSERT(CTFPOOLHEAD(osh, skb) == (struct sock *)osh->ctfpool->head);
	CTFPOOL_UNLOCK(osh->ctfpool, flags);

	/* Init skb struct */
	skb->next = skb->prev = NULL;
#if defined(__ARM_ARCH_7A__)
	skb->data = skb->head + NET_SKB_PAD;
	skb->tail = skb->head + NET_SKB_PAD;
#else
	skb->data = skb->head + 16;
	skb->tail = skb->head + 16;
#endif /* __ARM_ARCH_7A__ */
	skb->len = 0;
	skb->cloned = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
	skb->list = NULL;
#endif
	atomic_set(&skb->users, 1);

	PKTSETCLINK(skb, NULL);
	PKTCCLRATTR(skb);
	PKTFAST(osh, skb) &= ~(CTFBUF | SKIPCT | CHAINED);

	return skb;
}
#endif /* CTFPOOL */
/* Convert a driver packet to native(OS) packet
 * In the process, packettag is zeroed out before sending up
 * IP code depends on skb->cb to be setup correctly with various options
 * In our case, that means it should be 0
 */
struct sk_buff * BCMFASTPATH
osl_pkt_tonative(osl_t *osh, void *pkt)
{
	struct sk_buff *nskb;
#ifdef BCMDBG_CTRACE
	struct sk_buff *nskb1, *nskb2;
#endif

	if (osh->pub.pkttag)
		OSL_PKTTAG_CLEAR(pkt);

	/* Decrement the packet counter */
	for (nskb = (struct sk_buff *)pkt; nskb; nskb = nskb->next) {
		atomic_sub(PKTISCHAINED(nskb) ? PKTCCNT(nskb) : 1, &osh->cmn->pktalloced);

#ifdef BCMDBG_CTRACE
		for (nskb1 = nskb; nskb1 != NULL; nskb1 = nskb2) {
			if (PKTISCHAINED(nskb1)) {
				nskb2 = PKTCLINK(nskb1);
			}
			else
				nskb2 = NULL;

			DEL_CTRACE(osh, nskb1);
		}
#endif /* BCMDBG_CTRACE */
	}
	return (struct sk_buff *)pkt;
}

/* Convert a native(OS) packet to driver packet.
 * In the process, native packet is destroyed, there is no copying
 * Also, a packettag is zeroed out
 */
#ifdef BCMDBG_CTRACE
void * BCMFASTPATH
osl_pkt_frmnative(osl_t *osh, void *pkt, int line, char *file)
#else
void * BCMFASTPATH
osl_pkt_frmnative(osl_t *osh, void *pkt)
#endif /* BCMDBG_CTRACE */
{
	struct sk_buff *cskb;
	struct sk_buff *nskb;
	unsigned long pktalloced = 0;

	if (osh->pub.pkttag)
		OSL_PKTTAG_CLEAR(pkt);

	/* walk the PKTCLINK() list */
	for (cskb = (struct sk_buff *)pkt;
	     cskb != NULL;
	     cskb = PKTISCHAINED(cskb) ? PKTCLINK(cskb) : NULL) {

		/* walk the pkt buffer list */
		for (nskb = cskb; nskb; nskb = nskb->next) {

			/* Increment the packet counter */
			pktalloced++;

			/* clean the 'prev' pointer
			 * Kernel 3.18 is leaving skb->prev pointer set to skb
			 * to indicate a non-fragmented skb
			 */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
			nskb->prev = NULL;
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0) */


#ifdef BCMDBG_CTRACE
			ADD_CTRACE(osh, nskb, file, line);
#endif /* BCMDBG_CTRACE */
		}
	}

	/* Increment the packet counter */
	atomic_add(pktalloced, &osh->cmn->pktalloced);

	return (void *)pkt;
}

/* Return a new packet. zero out pkttag */
#ifdef BCMDBG_CTRACE
void * BCMFASTPATH
osl_pktget(osl_t *osh, uint len, int line, char *file)
#else
void * BCMFASTPATH
osl_pktget(osl_t *osh, uint len)
#endif /* BCMDBG_CTRACE */
{
	struct sk_buff *skb;

#ifdef CTFPOOL
	/* Allocate from local pool */
	skb = osl_pktfastget(osh, len);
	if ((skb != NULL) || ((skb = osl_alloc_skb(osh, len)) != NULL)) {
#else /* CTFPOOL */
	if ((skb = osl_alloc_skb(osh, len))) {
#endif /* CTFPOOL */
		skb->tail += len;
		skb->len  += len;
		skb->priority = 0;

#ifdef BCMDBG_CTRACE
		ADD_CTRACE(osh, skb, file, line);
#endif
		atomic_inc(&osh->cmn->pktalloced);
	}

	return ((void*) skb);
}

#ifdef CTFPOOL
static inline void
osl_pktfastfree(osl_t *osh, struct sk_buff *skb)
{
	ctfpool_t *ctfpool;
#ifdef CTFPOOL_SPINLOCK
	unsigned long flags;
#endif /* CTFPOOL_SPINLOCK */

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 14)
	skb->tstamp.tv.sec = 0;
#else
	skb->stamp.tv_sec = 0;
#endif

	/* We only need to init the fields that we change */
	skb->dev = NULL;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
	skb->dst = NULL;
#endif
	OSL_PKTTAG_CLEAR(skb);
	skb->ip_summed = 0;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
	skb_orphan(skb);
#else
	skb->destructor = NULL;
#endif

	ctfpool = (ctfpool_t *)CTFPOOLPTR(osh, skb);
	ASSERT(ctfpool != NULL);

	/* Add object to the ctfpool */
	CTFPOOL_LOCK(ctfpool, flags);
	skb->next = (struct sk_buff *)ctfpool->head;
	ctfpool->head = (void *)skb;

	ctfpool->fast_frees++;
	ctfpool->curr_obj++;

	ASSERT(ctfpool->curr_obj <= ctfpool->max_obj);
	CTFPOOL_UNLOCK(ctfpool, flags);
}
#endif /* CTFPOOL */

/* Free the driver packet. Free the tag if present */
void BCMFASTPATH
osl_pktfree(osl_t *osh, void *p, bool send)
{
	struct sk_buff *skb, *nskb;
	if (osh == NULL)
		return;

	skb = (struct sk_buff*) p;

	if (send && osh->pub.tx_fn)
		osh->pub.tx_fn(osh->pub.tx_ctx, p, 0);

	PKTDBG_TRACE(osh, (void *) skb, PKTLIST_PKTFREE);

	/* perversion: we use skb->next to chain multi-skb packets */
	while (skb) {
		nskb = skb->next;
		skb->next = NULL;

#ifdef BCMDBG_CTRACE
		DEL_CTRACE(osh, skb);
#endif


#ifdef CTFPOOL
		if (PKTISFAST(osh, skb)) {
			if (atomic_read(&skb->users) == 1)
				smp_rmb();
			else if (!atomic_dec_and_test(&skb->users))
				goto next_skb;
			osl_pktfastfree(osh, skb);
		} else
#endif
		{
			if (skb->destructor)
				/* cannot kfree_skb() on hard IRQ (net/core/skbuff.c) if
				 * destructor exists
				 */
				dev_kfree_skb_any(skb);
			else
				/* can free immediately (even in_irq()) if destructor
				 * does not exist
				 */
				dev_kfree_skb(skb);
		}
#ifdef CTFPOOL
next_skb:
#endif
		atomic_dec(&osh->cmn->pktalloced);
		skb = nskb;
	}
}

#ifdef CONFIG_DHD_USE_STATIC_BUF
void*
osl_pktget_static(osl_t *osh, uint len)
{
	int i = 0;
	struct sk_buff *skb;

	if (len > DHD_SKB_MAX_BUFSIZE) {
		printk("%s: attempt to allocate huge packet (0x%x)\n", __FUNCTION__, len);
		return osl_pktget(osh, len);
	}

	down(&bcm_static_skb->osl_pkt_sem);

	if (len <= DHD_SKB_1PAGE_BUFSIZE) {
		for (i = 0; i < STATIC_PKT_MAX_NUM; i++) {
			if (bcm_static_skb->pkt_use[i] == 0)
				break;
		}

		if (i != STATIC_PKT_MAX_NUM) {
			bcm_static_skb->pkt_use[i] = 1;

			skb = bcm_static_skb->skb_4k[i];
			skb_set_tail_pointer(skb, len);
			skb->len = len;

			up(&bcm_static_skb->osl_pkt_sem);
			return skb;
		}
	}

	if (len <= DHD_SKB_2PAGE_BUFSIZE) {
		for (i = 0; i < STATIC_PKT_MAX_NUM; i++) {
			if (bcm_static_skb->pkt_use[i + STATIC_PKT_MAX_NUM]
				== 0)
				break;
		}

		if (i != STATIC_PKT_MAX_NUM) {
			bcm_static_skb->pkt_use[i + STATIC_PKT_MAX_NUM] = 1;
			skb = bcm_static_skb->skb_8k[i];
			skb_set_tail_pointer(skb, len);
			skb->len = len;

			up(&bcm_static_skb->osl_pkt_sem);
			return skb;
		}
	}

#if defined(ENHANCED_STATIC_BUF)
	if (bcm_static_skb->pkt_use[STATIC_PKT_MAX_NUM * 2] == 0) {
		bcm_static_skb->pkt_use[STATIC_PKT_MAX_NUM * 2] = 1;

		skb = bcm_static_skb->skb_16k;
		skb_set_tail_pointer(skb, len);
		skb->len = len;

		up(&bcm_static_skb->osl_pkt_sem);
		return skb;
	}
#endif

	up(&bcm_static_skb->osl_pkt_sem);
	printk("%s: all static pkt in use!\n", __FUNCTION__);
	return osl_pktget(osh, len);
}

void
osl_pktfree_static(osl_t *osh, void *p, bool send)
{
	int i;
	if (!bcm_static_skb) {
		osl_pktfree(osh, p, send);
		return;
	}

	down(&bcm_static_skb->osl_pkt_sem);
	for (i = 0; i < STATIC_PKT_MAX_NUM; i++) {
		if (p == bcm_static_skb->skb_4k[i]) {
			bcm_static_skb->pkt_use[i] = 0;
			up(&bcm_static_skb->osl_pkt_sem);
			return;
		}
	}

	for (i = 0; i < STATIC_PKT_MAX_NUM; i++) {
		if (p == bcm_static_skb->skb_8k[i]) {
			bcm_static_skb->pkt_use[i + STATIC_PKT_MAX_NUM] = 0;
			up(&bcm_static_skb->osl_pkt_sem);
			return;
		}
	}
#ifdef ENHANCED_STATIC_BUF
	if (p == bcm_static_skb->skb_16k) {
		bcm_static_skb->pkt_use[STATIC_PKT_MAX_NUM * 2] = 0;
		up(&bcm_static_skb->osl_pkt_sem);
		return;
	}
#endif
	up(&bcm_static_skb->osl_pkt_sem);
	osl_pktfree(osh, p, send);
}
#endif /* CONFIG_DHD_USE_STATIC_BUF */

uint32
osl_pci_read_config(osl_t *osh, uint offset, uint size)
{
	uint val = 0;
	uint retry = PCI_CFG_RETRY;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	/* only 4byte access supported */
	ASSERT(size == 4);

	do {
		pci_read_config_dword(osh->pdev, offset, &val);
		if (val != 0xffffffff)
			break;
	} while (retry--);


	return (val);
}

void
osl_pci_write_config(osl_t *osh, uint offset, uint size, uint val)
{
	uint retry = PCI_CFG_RETRY;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	/* only 4byte access supported */
	ASSERT(size == 4);

	do {
		pci_write_config_dword(osh->pdev, offset, val);
		if (offset != PCI_BAR0_WIN)
			break;
		if (osl_pci_read_config(osh, offset, size) == val)
			break;
	} while (retry--);

}

/* return bus # for the pci device pointed by osh->pdev */
uint
osl_pci_bus(osl_t *osh)
{
	ASSERT(osh && (osh->magic == OS_HANDLE_MAGIC) && osh->pdev);

	return ((struct pci_dev *)osh->pdev)->bus->number;
}

/* return slot # for the pci device pointed by osh->pdev */
uint
osl_pci_slot(osl_t *osh)
{
	ASSERT(osh && (osh->magic == OS_HANDLE_MAGIC) && osh->pdev);

#if defined(__ARM_ARCH_7A__) && LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)
	return PCI_SLOT(((struct pci_dev *)osh->pdev)->devfn) + 1;
#else
	return PCI_SLOT(((struct pci_dev *)osh->pdev)->devfn);
#endif
}

/* return the pci device pointed by osh->pdev */
struct pci_dev *
osl_pci_device(osl_t *osh)
{
	ASSERT(osh && (osh->magic == OS_HANDLE_MAGIC) && osh->pdev);

	return osh->pdev;
}

static void
osl_pcmcia_attr(osl_t *osh, uint offset, char *buf, int size, bool write)
{
}

void
osl_pcmcia_read_attr(osl_t *osh, uint offset, void *buf, int size)
{
	osl_pcmcia_attr(osh, offset, (char *) buf, size, FALSE);
}

void
osl_pcmcia_write_attr(osl_t *osh, uint offset, void *buf, int size)
{
	osl_pcmcia_attr(osh, offset, (char *) buf, size, TRUE);
}

void *
osl_malloc(osl_t *osh, uint size)
{
	void *addr;
	gfp_t flags;

	/* only ASSERT if osh is defined */
	if (osh)
		ASSERT(osh->magic == OS_HANDLE_MAGIC);
#ifdef CONFIG_DHD_USE_STATIC_BUF
	if (bcm_static_buf)
	{
		unsigned long irq_flags;
		int i = 0;
		if ((size >= PAGE_SIZE)&&(size <= STATIC_BUF_SIZE))
		{
			spin_lock_irqsave(&bcm_static_buf->static_lock, irq_flags);

			for (i = 0; i < STATIC_BUF_MAX_NUM; i++)
			{
				if (bcm_static_buf->buf_use[i] == 0)
					break;
			}

			if (i == STATIC_BUF_MAX_NUM)
			{
				spin_unlock_irqrestore(&bcm_static_buf->static_lock, irq_flags);
				printk("all static buff in use!\n");
				goto original;
			}

			bcm_static_buf->buf_use[i] = 1;
			spin_unlock_irqrestore(&bcm_static_buf->static_lock, irq_flags);

			bzero(bcm_static_buf->buf_ptr+STATIC_BUF_SIZE*i, size);
			if (osh)
				atomic_add(size, &osh->cmn->malloced);

			return ((void *)(bcm_static_buf->buf_ptr+STATIC_BUF_SIZE*i));
		}
	}
original:
#endif /* CONFIG_DHD_USE_STATIC_BUF */

	flags = CAN_SLEEP() ? GFP_KERNEL: GFP_ATOMIC;
	if ((addr = kmalloc(size, flags)) == NULL) {
		if (osh)
			osh->failed++;
		return (NULL);
	}
	if (osh && osh->cmn)
		atomic_add(size, &osh->cmn->malloced);

	return (addr);
}

void *
osl_mallocz(osl_t *osh, uint size)
{
	void *ptr;

	ptr = osl_malloc(osh, size);

	if (ptr != NULL) {
		bzero(ptr, size);
	}

	return ptr;
}

void
osl_mfree(osl_t *osh, void *addr, uint size)
{
#ifdef CONFIG_DHD_USE_STATIC_BUF
	unsigned long flags;

	if (bcm_static_buf)
	{
		if ((addr > (void *)bcm_static_buf) && ((unsigned char *)addr
			<= ((unsigned char *)bcm_static_buf + STATIC_BUF_TOTAL_LEN)))
		{
			int buf_idx = 0;

			buf_idx = ((unsigned char *)addr - bcm_static_buf->buf_ptr)/STATIC_BUF_SIZE;

			spin_lock_irqsave(&bcm_static_buf->static_lock, flags);
			bcm_static_buf->buf_use[buf_idx] = 0;
			spin_unlock_irqrestore(&bcm_static_buf->static_lock, flags);

			if (osh && osh->cmn) {
				ASSERT(osh->magic == OS_HANDLE_MAGIC);
				atomic_sub(size, &osh->cmn->malloced);
			}
			return;
		}
	}
#endif /* CONFIG_DHD_USE_STATIC_BUF */
	if (osh && osh->cmn) {
		ASSERT(osh->magic == OS_HANDLE_MAGIC);

		ASSERT(size <= osl_malloced(osh));

		atomic_sub(size, &osh->cmn->malloced);
	}
	kfree(addr);
}

uint
osl_check_memleak(osl_t *osh)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	if (atomic_read(&osh->cmn->refcount) == 1)
		return (atomic_read(&osh->cmn->malloced));
	else
		return 0;
}

uint
osl_malloced(osl_t *osh)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
		return (atomic_read(&osh->cmn->malloced));
}

uint
osl_malloc_failed(osl_t *osh)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	return (osh->failed);
}


uint
osl_dma_consistent_align(void)
{
	return (PAGE_SIZE);
}

void*
osl_dma_alloc_consistent(osl_t *osh, uint size, uint16 align_bits, uint *alloced, dmaaddr_t *pap)
{
	void *va;
	uint16 align = (1 << align_bits);
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	if (!ISALIGNED(DMA_CONSISTENT_ALIGN, align))
		size += align;
	*alloced = size;

#ifdef __ARM_ARCH_7A__
	va = kmalloc(size, GFP_ATOMIC | __GFP_ZERO);
	if (va)
		*pap = (ulong)__virt_to_phys((ulong)va);
#else
	{
		dma_addr_t pap_lin;
		va = pci_alloc_consistent(osh->pdev, size, &pap_lin);
		*pap = (dmaaddr_t)pap_lin;
	}
#endif
	return va;
}

void
osl_dma_free_consistent(osl_t *osh, void *va, uint size, dmaaddr_t pa)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

#ifdef __ARM_ARCH_7A__
	kfree(va);
#else
	pci_free_consistent(osh->pdev, size, va, (dma_addr_t)pa);
#endif
}

dmaaddr_t BCMFASTPATH
osl_dma_map(osl_t *osh, void *va, uint size, int direction, void *p, hnddma_seg_map_t *dmah)
{
	int dir;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;

#if defined(__ARM_ARCH_7A__) && defined(BCMDMASGLISTOSL)
	if (dmah != NULL) {
		int32 nsegs, i, totsegs = 0, totlen = 0;
		struct scatterlist *sg, _sg[MAX_DMA_SEGS * 2];
		struct sk_buff *skb;
		for (skb = (struct sk_buff *)p; skb != NULL; skb = PKTNEXT(osh, skb)) {
			sg = &_sg[totsegs];
			if (skb_is_nonlinear(skb)) {
				nsegs = skb_to_sgvec(skb, sg, 0, PKTLEN(osh, skb));
				ASSERT((nsegs > 0) && (totsegs + nsegs <= MAX_DMA_SEGS));
				pci_map_sg(osh->pdev, sg, nsegs, dir);
			} else {
				nsegs = 1;
				ASSERT(totsegs + nsegs <= MAX_DMA_SEGS);
				sg->page_link = 0;
				sg_set_buf(sg, PKTDATA(osh, skb), PKTLEN(osh, skb));
				pci_map_single(osh->pdev, PKTDATA(osh, skb), PKTLEN(osh, skb), dir);
			}
			totsegs += nsegs;
			totlen += PKTLEN(osh, skb);
		}
		dmah->nsegs = totsegs;
		dmah->origsize = totlen;
		for (i = 0, sg = _sg; i < totsegs; i++, sg++) {
			dmah->segs[i].addr = sg_phys(sg);
			dmah->segs[i].length = sg->length;
		}
		return dmah->segs[0].addr;
	}
#endif /* __ARM_ARCH_7A__ && BCMDMASGLISTOSL */

	return (pci_map_single(osh->pdev, va, size, dir));
}

void BCMFASTPATH
osl_dma_unmap(osl_t *osh, uint pa, uint size, int direction)
{
	int dir;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;
	pci_unmap_single(osh->pdev, (uint32)pa, size, dir);
}


#if defined(__ARM_ARCH_7A__)

inline void BCMFASTPATH
osl_cache_flush(void *va, uint size)
{
	dma_sync_single_for_device(OSH_NULL, virt_to_dma(OSH_NULL, va), size, DMA_TX);
}

inline void BCMFASTPATH
osl_cache_inv(void *va, uint size)
{
	dma_sync_single_for_cpu(OSH_NULL, virt_to_dma(OSH_NULL, va), size, DMA_RX);
}

inline void osl_prefetch(const void *ptr)
{
	__asm__ __volatile__("pld\t%0" :: "o"(*(char *)ptr) : "cc");
}
#endif 

#if defined(BCMASSERT_LOG)
void
osl_assert(const char *exp, const char *file, int line)
{
	char tempbuf[256];
	const char *basename;

	basename = strrchr(file, '/');
	/* skip the '/' */
	if (basename)
		basename++;

	if (!basename)
		basename = file;

#ifdef BCMASSERT_LOG
	snprintf(tempbuf, 64, "\"%s\": file \"%s\", line %d\n",
		exp, basename, line);
	printk("%s", tempbuf);
#endif /* BCMASSERT_LOG */


}
#endif 

void
osl_delay(uint usec)
{
	uint d;

	while (usec > 0) {
		d = MIN(usec, 1000);
		udelay(d);
		usec -= d;
	}
}

void
osl_sleep(uint ms)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
	if (ms < 20)
		usleep_range(ms*1000, ms*1000 + 1000);
	else
#endif
	msleep(ms);
}


/* Clone a packet.
 * The pkttag contents are NOT cloned.
 */
#ifdef BCMDBG_CTRACE
void *
osl_pktdup(osl_t *osh, void *skb, int line, char *file)
#else
void *
osl_pktdup(osl_t *osh, void *skb)
#endif /* BCMDBG_CTRACE */
{
	void * p;

	ASSERT(!PKTISCHAINED(skb));

	/* clear the CTFBUF flag if set and map the rest of the buffer
	 * before cloning.
	 */
	PKTCTFMAP(osh, skb);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
	if ((p = pskb_copy((struct sk_buff *)skb, GFP_ATOMIC)) == NULL)
#else
	if ((p = skb_clone((struct sk_buff *)skb, GFP_ATOMIC)) == NULL)
#endif
		return NULL;

#ifdef CTFPOOL
	if (PKTISFAST(osh, skb)) {
		ctfpool_t *ctfpool;

		/* if the buffer allocated from ctfpool is cloned then
		 * we can't be sure when it will be freed. since there
		 * is a chance that we will be losing a buffer
		 * from our pool, we increment the refill count for the
		 * object to be alloced later.
		 */
		ctfpool = (ctfpool_t *)CTFPOOLPTR(osh, skb);
		ASSERT(ctfpool != NULL);
		PKTCLRFAST(osh, p);
		PKTCLRFAST(osh, skb);
		ctfpool->refills++;
	}
#endif /* CTFPOOL */

	/* Clear PKTC  context */
	PKTSETCLINK(p, NULL);
	PKTCCLRFLAGS(p);
	PKTCSETCNT(p, 1);
	PKTCSETLEN(p, PKTLEN(osh, skb));

	/* skb_clone copies skb->cb.. we don't want that */
	if (osh->pub.pkttag)
		OSL_PKTTAG_CLEAR(p);

	/* Increment the packet counter */
	atomic_inc(&osh->cmn->pktalloced);
#ifdef BCMDBG_CTRACE
	ADD_CTRACE(osh, (struct sk_buff *)p, file, line);
#endif
	return (p);
}

#ifdef BCMDBG_CTRACE
int osl_pkt_is_frmnative(osl_t *osh, struct sk_buff *pkt)
{
	unsigned long flags;
	struct sk_buff *skb;
	int ck = FALSE;

	spin_lock_irqsave(&osh->ctrace_lock, flags);

	list_for_each_entry(skb, &osh->ctrace_list, ctrace_list) {
		if (pkt == skb) {
			ck = TRUE;
			break;
		}
	}

	spin_unlock_irqrestore(&osh->ctrace_lock, flags);
	return ck;
}

void osl_ctrace_dump(osl_t *osh, struct bcmstrbuf *b)
{
	unsigned long flags;
	struct sk_buff *skb;
	int idx = 0;
	int i, j;

	spin_lock_irqsave(&osh->ctrace_lock, flags);

	if (b != NULL)
		bcm_bprintf(b, " Total %d sbk not free\n", osh->ctrace_num);
	else
		printk(" Total %d sbk not free\n", osh->ctrace_num);

	list_for_each_entry(skb, &osh->ctrace_list, ctrace_list) {
		if (b != NULL)
			bcm_bprintf(b, "[%d] skb %p:\n", ++idx, skb);
		else
			printk("[%d] skb %p:\n", ++idx, skb);

		for (i = 0; i < skb->ctrace_count; i++) {
			j = (skb->ctrace_start + i) % CTRACE_NUM;
			if (b != NULL)
				bcm_bprintf(b, "    [%s(%d)]\n", skb->func[j], skb->line[j]);
			else
				printk("    [%s(%d)]\n", skb->func[j], skb->line[j]);
		}
		if (b != NULL)
			bcm_bprintf(b, "\n");
		else
			printk("\n");
	}

	spin_unlock_irqrestore(&osh->ctrace_lock, flags);

	return;
}
#endif /* BCMDBG_CTRACE */


/*
 * OSLREGOPS specifies the use of osl_XXX routines to be used for register access
 */

/*
 * BINOSL selects the slightly slower function-call-based binary compatible osl.
 */

uint
osl_pktalloced(osl_t *osh)
{
	if (atomic_read(&osh->cmn->refcount) == 1)
		return (atomic_read(&osh->cmn->pktalloced));
	else
		return 0;
}

/* Linux Kernel: File Operations: start */
void *
osl_os_open_image(char *filename)
{
	struct file *fp;

	fp = filp_open(filename, O_RDONLY, 0);
	/*
	 * 2.6.11 (FC4) supports filp_open() but later revs don't?
	 * Alternative:
	 * fp = open_namei(AT_FDCWD, filename, O_RD, 0);
	 * ???
	 */
	 if (IS_ERR(fp))
		 fp = NULL;

	 return fp;
}

int
osl_os_get_image_block(char *buf, int len, void *image)
{
	struct file *fp = (struct file *)image;
	int rdlen;

	if (!image)
		return 0;

	rdlen = kernel_read(fp, fp->f_pos, buf, len);
	if (rdlen > 0)
		fp->f_pos += rdlen;

	return rdlen;
}

void
osl_os_close_image(void *image)
{
	if (image)
		filp_close((struct file *)image, NULL);
}

int
osl_os_image_size(void *image)
{
	int len = 0, curroffset;

	if (image) {
		/* store the current offset */
		curroffset = generic_file_llseek(image, 0, 1);
		/* goto end of file to get length */
		len = generic_file_llseek(image, 0, 2);
		/* restore back the offset */
		generic_file_llseek(image, curroffset, 0);
	}
	return len;
}

/* Linux Kernel: File Operations: end */