source: GPL/trunk/lib32/misc.c

/* $Id: misc.c,v 1.1.1.1 2003/07/02 13:57:02 eleph Exp $ */
/*
 * OS/2 implementation of misc. Linux kernel services
 *
 * (C) 2000-2002 InnoTek Systemberatung GmbH
 * (C) 2000-2001 Sander van Leeuwen (sandervl@xs4all.nl)
 *
 * hweight32 based on Linux code (bitops.h)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
 * USA.
 *
 */
#include <limits.h>
#include "linux.h"
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/of.h>
#include <linux/poll.h>
#define CONFIG_PROC_FS 1
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <linux\ioport.h>
#include <linux\utsname.h>
#include <linux\module.h>
#include <linux/workqueue.h>
#include <linux/firmware.h>
#include <linux/ctype.h>
#include <linux/math64.h>
#include <dbgos2.h>

void StringOut(char *DbgStr);
extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);

struct new_utsname system_utsname = {0};
struct resource ioport_resource = {NULL, 0, 0, IORESOURCE_IO, NULL, NULL, NULL};
struct resource iomem_resource  = {NULL, 0, 0, IORESOURCE_MEM, NULL, NULL, NULL};
mem_map_t *mem_map = 0;
int this_module[64] = {0};

#include <stdarg.h>

char szLastALSAError1[128] = {0};
char szOverrunTest1        = 0xCC;
char szLastALSAError2[128] = {0};
char szOverrunTest2        = 0xCC;
int  iLastError            = 0;

//******************************************************************************
//Save error message in szLastALSAError; if card init failed, then we will
//print it in drv32\init.cpp
//******************************************************************************
int printk(const char * fmt, ...)
{
    va_list argptr;                /* -> variable argument list */

    char *pszLastALSAError;

    pszLastALSAError= iLastError ? szLastALSAError2 : szLastALSAError1;

    va_start(argptr, fmt);           /* get pointer to argument list */
    vsprintf(pszLastALSAError, fmt, argptr);
//    strcat(pszLastALSAError, "\r");
    va_end(argptr);                /* done with variable arguments */

    if(szOverrunTest1 != 0xCC || szOverrunTest2 != 0xCC) {
        DebugInt3();
    }

        StringOut(pszLastALSAError);
//    rprintf( (pszLastALSAError) );
    if(++iLastError > 1) {
        iLastError = 0;
    }
    return 0;
}

//******************************************************************************
//Save error message in szLastALSAError; if card init failed, then we will
//print it in drv32\init.cpp
//******************************************************************************
int dev_dbg(const struct device *dev, const char * fmt, ...)
{
    va_list argptr;                /* -> variable argument list */

    char *pszLastALSAError;

    pszLastALSAError= iLastError ? szLastALSAError2 : szLastALSAError1;

    va_start(argptr, fmt);           /* get pointer to argument list */
    vsprintf(pszLastALSAError, fmt, argptr);
//    strcat(pszLastALSAError, "\r");
    va_end(argptr);                /* done with variable arguments */

    if(szOverrunTest1 != 0xCC || szOverrunTest2 != 0xCC) {
        DebugInt3();
    }

        StringOut(pszLastALSAError);
//    rprintf( (pszLastALSAError) );
    if(++iLastError > 1) {
        iLastError = 0;
    }
    return 0;
}
//******************************************************************************
int pcm_dbg(struct snd_pcm *dev, const char * fmt, ...)
{
    va_list argptr;                /* -> variable argument list */

    char *pszLastALSAError;

    pszLastALSAError= iLastError ? szLastALSAError2 : szLastALSAError1;

    va_start(argptr, fmt);           /* get pointer to argument list */
    vsprintf(pszLastALSAError, fmt, argptr);
//    strcat(pszLastALSAError, "\r");
    va_end(argptr);                /* done with variable arguments */

    if(szOverrunTest1 != 0xCC || szOverrunTest2 != 0xCC) {
        DebugInt3();
    }

        StringOut(pszLastALSAError);
//    rprintf( (pszLastALSAError) );
    if(++iLastError > 1) {
        iLastError = 0;
    }
    return 0;
}
//******************************************************************************
int codec_dbg(struct hda_codec *dev, const char * fmt, ...)
{
    va_list argptr;                /* -> variable argument list */

    char *pszLastALSAError;

    pszLastALSAError= iLastError ? szLastALSAError2 : szLastALSAError1;

    va_start(argptr, fmt);           /* get pointer to argument list */
    vsprintf(pszLastALSAError, fmt, argptr);
//    strcat(pszLastALSAError, "\r");
    va_end(argptr);                /* done with variable arguments */

    if(szOverrunTest1 != 0xCC || szOverrunTest2 != 0xCC) {
        DebugInt3();
    }

        StringOut(pszLastALSAError);
//    rprintf( (pszLastALSAError) );
    if(++iLastError > 1) {
        iLastError = 0;
    }
    return 0;
}
//******************************************************************************
//******************************************************************************
void schedule(void)
{

}
//******************************************************************************
//******************************************************************************
void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
{

}
//******************************************************************************
//******************************************************************************
int __check_region(struct resource *a, unsigned long b, unsigned long c)
{
    DebugInt3();
    return 0;
}

/* --------------------------------------------------------------------- */
/*
 * hweightN: returns the hamming weight (i.e. the number
 * of bits set) of a N-bit word
 */

#ifdef hweight32
#undef hweight32
#endif

unsigned int hweight32(unsigned int w)
{
        unsigned int res = (w & 0x55555555) + ((w >> 1) & 0x55555555);
        res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
        res = (res & 0x0F0F0F0F) + ((res >> 4) & 0x0F0F0F0F);
        res = (res & 0x00FF00FF) + ((res >> 8) & 0x00FF00FF);
        return (res & 0x0000FFFF) + ((res >> 16) & 0x0000FFFF);
}
//******************************************************************************
//******************************************************************************
#if 0
mem_map_t *virt_to_page(int x)
{
    static mem_map_t map = {0};
    return &map;
}
#endif
//******************************************************************************
//******************************************************************************
struct proc_dir_entry proc_root = {0};
//******************************************************************************
//******************************************************************************
struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
                                         struct proc_dir_entry *parent)
{
    struct proc_dir_entry *proc;
    proc = (struct proc_dir_entry *)kmalloc(sizeof(struct proc_dir_entry), 0);
    memset(proc, 0, sizeof(struct proc_dir_entry));

    proc->name   = name;
    proc->mode   = mode;
    proc->parent = parent;

    return proc;
}
//******************************************************************************
//******************************************************************************
void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
{
    return; //memory leak
}
//******************************************************************************
//******************************************************************************
int proc_register(struct proc_dir_entry *parent, struct proc_dir_entry *proc)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
int proc_unregister(struct proc_dir_entry *proc, int bla)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode,
        struct proc_dir_entry *parent){
    struct proc_dir_entry *proc;
    proc = (struct proc_dir_entry *)kmalloc(sizeof(struct proc_dir_entry), 0);
    memset(proc, 0, sizeof(struct proc_dir_entry));

    proc->name   = name;
    proc->parent = parent;

    return proc;
}
//******************************************************************************
//******************************************************************************
struct proc_dir_entry *proc_mkdir(const char *name, struct proc_dir_entry *parent)
{
    return proc_mkdir_mode(name, S_IRUGO | S_IXUGO, parent);
}
//******************************************************************************
//******************************************************************************
struct proc_dir_entry *proc_symlink(const char *name, struct proc_dir_entry *parent, const char *dest)
{
    struct proc_dir_entry *proc;
    proc = (struct proc_dir_entry *)kmalloc(sizeof(struct proc_dir_entry), 0);
    memset(proc, 0, sizeof(struct proc_dir_entry));

    proc->name   = name;
    proc->parent = parent;
    proc->data = (void*)dest;

    return proc;
}
//******************************************************************************
//******************************************************************************
int fasync_helper(int a, struct file *b, int c, struct fasync_struct **d)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
void kill_fasync(struct fasync_struct **a, int b, int c)
{
}
//******************************************************************************
//******************************************************************************
int request_dma(unsigned int dmanr, const char * device_id)     /* reserve a DMA channel */
{
    DebugInt3();
    return 0;
}
//******************************************************************************
//******************************************************************************
void free_dma(unsigned int dmanr)
{
    DebugInt3();
}
//******************************************************************************
/* enable/disable a specific DMA channel */
//******************************************************************************
void enable_dma(unsigned int dmanr)
{
    DebugInt3();
}
//******************************************************************************
//******************************************************************************
void disable_dma(unsigned int dmanr)
{
    DebugInt3();
}
//******************************************************************************
//static struct notifier_block *reboot_notify_list = NULL;
// No need to implement this right now. The ESS Maestro 3 driver uses it
// to call pci_unregister_driver, which is always called from the shutdown
// notification sent by OS2.
// Same goes for es1968 & Yamaha's DS1/DS1E.
//******************************************************************************
int register_reboot_notifier(struct notifier_block *pnblock)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
int unregister_reboot_notifier(struct notifier_block *pnblock)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
static void __x_queue_work(struct workqueue_struct *wq, struct work_struct *work)
{
        unsigned long flags;

        spin_lock_irqsave(&wq->lock, flags);
        work->wq_data = wq;
        list_add_tail(&work->entry, &wq->worklist);
        wake_up(&wq->more_work);
        spin_unlock_irqrestore(&wq->lock, flags);
}
//******************************************************************************
//******************************************************************************
int queue_work(struct workqueue_struct *wq, struct work_struct *work)
{
        if (!test_and_set_bit(0, &work->pending)) {
                __x_queue_work(wq, work);
                return 1;
        }
        return 0;
}
//******************************************************************************
//******************************************************************************
static void run_workqueue(struct workqueue_struct *wq)
{
        unsigned long flags;

        spin_lock_irqsave(&wq->lock, flags);
        while (!list_empty(&wq->worklist)) {
                struct work_struct *work = list_entry(wq->worklist.next,
                                                      struct work_struct, entry);
                void (*f) (void *) = work->func;
                void *data = work->data;

                list_del_init(wq->worklist.next);
                spin_unlock_irqrestore(&wq->lock, flags);
                clear_bit(0, &work->pending);
                f(data);
                spin_lock_irqsave(&wq->lock, flags);
                wake_up(&wq->work_done);
        }
        spin_unlock_irqrestore(&wq->lock, flags);
}
//******************************************************************************
//******************************************************************************
void flush_workqueue(struct workqueue_struct *wq)
{

        if (wq->task == current) {
                run_workqueue(wq);
        } else {
                struct wait_queue_entry wait;

                init_waitqueue_entry(&wait, current);
                set_current_state(TASK_UNINTERRUPTIBLE);
                spin_lock_irq(&wq->lock);
                add_wait_queue(&wq->work_done, &wait);
#ifndef TARGET_OS2
                while (!list_empty(&wq->worklist)) {
                        spin_unlock_irq(&wq->lock);
                        schedule();  // DAZ system hangs here because this function does nothing
                        spin_lock_irq(&wq->lock);
                }
#endif
                set_current_state(TASK_RUNNING);
                remove_wait_queue(&wq->work_done, &wait);
                spin_unlock_irq(&wq->lock);
        }
}
//******************************************************************************
//******************************************************************************
struct workqueue_struct *create_workqueue(const char *name)
{
        struct workqueue_struct *wq;
        
        BUG_ON(strlen(name) > 10);
        
        wq = kmalloc(sizeof(*wq), GFP_KERNEL);
        if (!wq)
                return NULL;
        memset(wq, 0, sizeof(*wq));
        
        spin_lock_init(&wq->lock);
        INIT_LIST_HEAD(&wq->worklist);
        init_waitqueue_head(&wq->more_work);
        init_waitqueue_head(&wq->work_done);
#ifndef TARGET_OS2
        init_completion(&wq->thread_exited);
        wq->name = name;
        wq->task_pid = kernel_thread(xworker_thread, wq, 0);
        if (wq->task_pid < 0) {
                printk(KERN_ERR "snd: failed to start thread %s\n", name);
                snd_compat_destroy_workqueue(wq);
                wq = NULL;
        }
        wq->task = find_task_by_pid(wq->task_pid);
#endif
        return wq;
}
//******************************************************************************
//******************************************************************************
void destroy_workqueue(struct workqueue_struct *wq)
{
#ifndef TARGET_OS2
        snd_compat_flush_workqueue(wq);
        kill_proc(wq->task_pid, SIGKILL, 1);
        if (wq->task_pid >= 0)
                wait_for_completion(&wq->thread_exited);
#endif
        kfree(wq);
}

//******************************************************************************
//******************************************************************************
char *kstrdup(const char *s, unsigned int __nocast gfp_flags)
{
        int len;
        char *buf;

        if (!s) return NULL;

        len = strlen(s) + 1;
        buf = kmalloc(len, gfp_flags);
        if (buf)
                memcpy(buf, s, len);
        return buf;
}
//******************************************************************************
//******************************************************************************
int mod_firmware_load(const char *fn, char **fp)
{
    return 0;
}
//******************************************************************************
//******************************************************************************
static int snd_try_load_firmware(const char *path, const char *name,
                                 struct firmware *firmware)
{
        char filename[30 + FIRMWARE_NAME_MAX];

        sprintf(filename, "%s/%s", path, name);
        firmware->size = mod_firmware_load(filename, (char **)&firmware->data);
        if (firmware->size)
                printk(KERN_INFO "Loaded '%s'.", filename);
        return firmware->size;
}
//******************************************************************************
//******************************************************************************
int request_firmware(const struct firmware **fw, const char *name,
                     struct device *device)
{
        struct firmware *firmware;

        *fw = NULL;
        firmware = kmalloc(sizeof *firmware, GFP_KERNEL);
        if (!firmware)
                return -ENOMEM;
        if (!snd_try_load_firmware("/lib/firmware", name, firmware) &&
            !snd_try_load_firmware("/lib/hotplug/firmware", name, firmware) &&
            !snd_try_load_firmware("/usr/lib/hotplug/firmware", name, firmware)) {
                kfree(firmware);
                return -EIO;
        }
        *fw = firmware;
        return 0;
}
//******************************************************************************
//******************************************************************************
void release_firmware(const struct firmware *fw)
{
        if (fw) {
                vfree(fw->data);
                kfree(fw);
        }
}
//******************************************************************************
//******************************************************************************
void *memdup_user(const void __user *src, size_t len)
{
        void *p = kmalloc(len, GFP_KERNEL);
        if (!p)
                return ERR_PTR(-ENOMEM);
        if (copy_from_user(p, src, len)) {
                kfree(p);
                return ERR_PTR(-EFAULT);
        }
        return p;
}
//******************************************************************************
//******************************************************************************
#define del_timer_sync(t) del_timer(t) /* FIXME: not quite correct on SMP */
int cancel_delayed_work(struct delayed_work *dwork)
{
        struct work_struct *work = &dwork->work;
        int ret;

        ret = del_timer_sync(&work->timer);
        if (ret)
                clear_bit(0, &work->pending);
        return ret;
}
//******************************************************************************
//******************************************************************************
struct workqueue_struct *system_wq;

int schedule_work(struct work_struct *work)
{
#ifndef TARGET_OS2 // crashes
        return queue_work(system_wq, work);
#endif
        return 0;
}

//******************************************************************************
//******************************************************************************
bool flush_delayed_work_sync(struct delayed_work *dwork)
{
        bool ret;
        ret = cancel_delayed_work(dwork);
        if (ret) {
                schedule_delayed_work(dwork, 0);
                flush_scheduled_work();
        }
        return ret;
}
//******************************************************************************
//******************************************************************************
static void delayed_work_timer_fn(unsigned long __data)
{
        struct work_struct *work = (struct work_struct *)__data;
        struct workqueue_struct *wq = work->wq_data;
        
        if (wq)
                __x_queue_work(wq, work);
        else
                schedule_work(work);
}
//******************************************************************************
//******************************************************************************
int queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork, unsigned long delay)
{
        struct work_struct *work = &dwork->work;
        struct timer_list *timer = &work->timer;

        if (!test_and_set_bit(0, &work->pending)) {
                work->wq_data = wq;
                timer->expires = jiffies + delay;
                timer->data = (unsigned long)work;
                timer->function = delayed_work_timer_fn;
                add_timer(timer);
                return 1;
        }
        return 0;
}
//******************************************************************************
//******************************************************************************
/* Greatest common divisor */
unsigned long gcd(unsigned long a, unsigned long b)
{
        unsigned long r;
        if (a < b) {
                r = a;
                a = b;
                b = r;
        }
        while ((r = a % b) != 0) {
                a = b;
                b = r;
        }
        return b;
}

//******************************************************************************
//******************************************************************************
int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
{
        char *tail;
        unsigned long val;
        size_t len;

        *res = 0;
        len = strlen(cp);
        if (len == 0)
                return -EINVAL;

        val = simple_strtoul(cp, &tail, base);
        if (tail == cp)
                return -EINVAL;

        if ((*tail == '\0') ||
                ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
                *res = val;
                return 0;
        }

        return -EINVAL;
}
//******************************************************************************
//******************************************************************************

static void u32_swap(void *a, void *b, int size)
{
        u32 t = *(u32 *)a;
        *(u32 *)a = *(u32 *)b;
        *(u32 *)b = t;
}

static void generic_swap(void *a, void *b, int size)
{
        char t;

        do {
                t = *(char *)a;
                *(char *)a++ = *(char *)b;
                *(char *)b++ = t;
        } while (--size > 0);
}

/**
 * sort - sort an array of elements
 * @base: pointer to data to sort
 * @num: number of elements
 * @size: size of each element
 * @cmp_func: pointer to comparison function
 * @swap_func: pointer to swap function or NULL
 *
 * This function does a heapsort on the given array. You may provide a
 * swap_func function optimized to your element type.
 *
 * Sorting time is O(n log n) both on average and worst-case. While
 * qsort is about 20% faster on average, it suffers from exploitable
 * O(n*n) worst-case behavior and extra memory requirements that make
 * it less suitable for kernel use.
 */

void sort(void *base, size_t num, size_t size,
          int (*cmp_func)(const void *, const void *),
          void (*swap_func)(void *, void *, int size))
{
        /* pre-scale counters for performance */
        int i = (num/2 - 1) * size, n = num * size, c, r;

        if (!swap_func)
                swap_func = (size == 4 ? u32_swap : generic_swap);

        /* heapify */
        for ( ; i >= 0; i -= size) {
                for (r = i; r * 2 + size < n; r  = c) {
                        c = r * 2 + size;
                        if (c < n - size &&
                                        cmp_func(base + c, base + c + size) < 0)
                                c += size;
                        if (cmp_func(base + r, base + c) >= 0)
                                break;
                        swap_func(base + r, base + c, size);
                }
        }

        /* sort */
        for (i = n - size; i > 0; i -= size) {
                swap_func(base, base + i, size);
                for (r = 0; r * 2 + size < i; r = c) {
                        c = r * 2 + size;
                        if (c < i - size &&
                                        cmp_func(base + c, base + c + size) < 0)
                                c += size;
                        if (cmp_func(base + r, base + c) >= 0)
                                break;
                        swap_func(base + r, base + c, size);
                }
        }
}
//******************************************************************************
//******************************************************************************

/**
 * hex_to_bin - convert a hex digit to its real value
 * @ch: ascii character represents hex digit
 *
 * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
 * input.
 */
int hex_to_bin(char ch)
{
        if ((ch >= '0') && (ch <= '9'))
                return ch - '0';
        ch = tolower(ch);
        if ((ch >= 'a') && (ch <= 'f'))
                return ch - 'a' + 10;
        return -1;
}
//******************************************************************************


/*
 * stream_open is used by subsystems that want stream-like file descriptors.
 * Such file descriptors are not seekable and don't have notion of position
 * (file.f_pos is always 0). Contrary to file descriptors of other regular
 * files, .read() and .write() can run simultaneously.
 *
 * stream_open never fails and is marked to return int so that it could be
 * directly used as file_operations.open .
 */
int stream_open(struct inode *inode, struct file *filp)
{
        filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE | FMODE_ATOMIC_POS);
        //DAZ f_mode is 16 bit so FMODE_STREAM doesn't fit, but we don't use this on OS/2.
        //filp->f_mode |= FMODE_STREAM;
        return 0;
}

/**
 * alloc_pages_exact - allocate pages with the given size
 * @size: the size to allocate in bytes
 * @gfp_flags: the allocation conditions, GFP_XXX
 *
 * Allocates the physically contiguous pages with the given size.
 *
 * Return: The pointer of the buffer, or %NULL if no enough memory.
 */
void *alloc_pages_exact(size_t size, gfp_t gfp_flags)
{
        int pg;

        if (WARN_ON(!size))
                return NULL;
        if (WARN_ON(!gfp_flags))
                return NULL;
        gfp_flags |= __GFP_COMP;        /* compound page lets parts be mapped */
        pg = get_order(size);
        return (void *) __get_free_pages(gfp_flags, pg);
}

/**
 * free_pages_exact - release the pages
 * @ptr: the buffer pointer to release
 * @size: the allocated buffer size
 *
 * Releases the buffer allocated via snd_malloc_pages().
 */
void free_pages_exact(void *ptr, size_t size)
{
        int pg;

        if (ptr == NULL)
                return;
        pg = get_order(size);
        free_pages((unsigned long) ptr, pg);
}

/**
 * of_node_put() - Decrement refcount of a node
 * @node:       Node to dec refcount, NULL is supported to simplify writing of
 *              callers
 */
void of_node_put(struct device_node *node)
{
        if (node)
                kobject_put(&node->kobj);
}

/**
 * sysfs_streq - return true if strings are equal, modulo trailing newline
 * @s1: one string
 * @s2: another string
 *
 * This routine returns true iff two strings are equal, treating both
 * NUL and newline-then-NUL as equivalent string terminations.  It's
 * geared for use with sysfs input strings, which generally terminate
 * with newlines but are compared against values without newlines.
 */
bool sysfs_streq(const char *s1, const char *s2)
{
        while (*s1 && *s1 == *s2) {
                s1++;
                s2++;
        }

        if (*s1 == *s2)
                return true;
        if (!*s1 && *s2 == '\n' && !s2[1])
                return true;
        if (*s1 == '\n' && !s1[1] && !*s2)
                return true;
        return false;
}
EXPORT_SYMBOL(sysfs_streq);

u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
{
        u32 high = divisor >> 32;
        u64 quot;

        if (high == 0) {
                u32 rem32;
                quot = div_u64_rem(dividend, divisor, &rem32);
                *remainder = rem32;
        } else {
                int n = fls(high);
                quot = div_u64(dividend >> n, divisor >> n);

                if (quot != 0)
                        quot--;

                *remainder = dividend - quot * divisor;
                if (*remainder >= divisor) {
                        quot++;
                        *remainder -= divisor;
                }
        }

        return quot;
}

/**
 * memset32() - Fill a memory area with a uint32_t
 * @s: Pointer to the start of the area.
 * @v: The value to fill the area with
 * @count: The number of values to store
 *
 * Differs from memset() in that it fills with a uint32_t instead
 * of a byte.  Remember that @count is the number of uint32_ts to
 * store, not the number of bytes.
 */
void *memset32(uint32_t *s, uint32_t v, size_t count)
{
        uint32_t *xs = s;

        while (count--)
                *xs++ = v;
        return s;
}
EXPORT_SYMBOL(memset32);

/**
 *      sysfs_emit - scnprintf equivalent, aware of PAGE_SIZE buffer.
 *      @buf:   start of PAGE_SIZE buffer.
 *      @fmt:   format
 *      @...:   optional arguments to @format
 *
 *
 * Returns number of characters written to @buf.
 */
int sysfs_emit(char *buf, const char *fmt, ...)
{
        va_list args;
        int len;

#ifdef NOT_USED
        if (WARN(!buf || offset_in_page(buf),
                 "invalid sysfs_emit: buf:%p\n", buf))
                return 0;
#endif

        va_start(args, fmt);
        len = vscnprintf(buf, PAGE_SIZE, fmt, args);
        va_end(args);

        return len;
}
EXPORT_SYMBOL_GPL(sysfs_emit);

/**
 *      sysfs_emit_at - scnprintf equivalent, aware of PAGE_SIZE buffer.
 *      @buf:   start of PAGE_SIZE buffer.
 *      @at:    offset in @buf to start write in bytes
 *              @at must be >= 0 && < PAGE_SIZE
 *      @fmt:   format
 *      @...:   optional arguments to @fmt
 *
 *
 * Returns number of characters written starting at &@buf[@at].
 */
int sysfs_emit_at(char *buf, int at, const char *fmt, ...)
{
        va_list args;
        int len;

#ifdef NOT_USED
        if (WARN(!buf || offset_in_page(buf) || at < 0 || at >= PAGE_SIZE,
                 "invalid sysfs_emit_at: buf:%p at:%d\n", buf, at))
                return 0;
#endif

        va_start(args, fmt);
        len = vscnprintf(buf + at, PAGE_SIZE - at, fmt, args);
        va_end(args);

        return len;
}
EXPORT_SYMBOL_GPL(sysfs_emit_at);