ioctl32.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 626 行 · 第 1/2 页

/* $Id: ioctl32.c,v 1.5 2002/10/18 00:21:43 varenet Exp $
 * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
 *
 * Copyright (C) 1997-2000  Jakub Jelinek  ([e-mail])
 * Copyright (C) 1998  Eddie C. Dost  ([e-mail])
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * ioctls.
 */

#include <linux/syscalls.h>

#define INCLUDES
#include "compat_ioctl.c"

#include <asm/perf.h>
#include <asm/ioctls.h>

#define CODE
#include "compat_ioctl.c"

/* Use this to get at 32-bit user passed pointers. 
   See sys_sparc32.c for description about these. */
#define A(__x) ((unsigned long)(__x))
/* The same for use with copy_from_user() and copy_to_user(). */
#define B(__x) ((void *)(unsigned long)(__x))

#if defined(CONFIG_DRM) || defined(CONFIG_DRM_MODULE)
/* This really belongs in include/linux/drm.h -DaveM */
#include "../../../drivers/char/drm/drm.h"

typedef struct drm32_version {
	int    version_major;	  /* Major version			    */
	int    version_minor;	  /* Minor version			    */
	int    version_patchlevel;/* Patch level			    */
	int    name_len;	  /* Length of name buffer		    */
	u32    name;		  /* Name of driver			    */
	int    date_len;	  /* Length of date buffer		    */
	u32    date;		  /* User-space buffer to hold date	    */
	int    desc_len;	  /* Length of desc buffer		    */
	u32    desc;		  /* User-space buffer to hold desc	    */
} drm32_version_t;
#define DRM32_IOCTL_VERSION    DRM_IOWR(0x00, drm32_version_t)

static int drm32_version(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	drm32_version_t *uversion = (drm32_version_t *)arg;
	char *name_ptr, *date_ptr, *desc_ptr;
	u32 tmp1, tmp2, tmp3;
	drm_version_t kversion;
	mm_segment_t old_fs;
	int ret;

	memset(&kversion, 0, sizeof(kversion));
	if (get_user(kversion.name_len, &uversion->name_len) ||
	    get_user(kversion.date_len, &uversion->date_len) ||
	    get_user(kversion.desc_len, &uversion->desc_len) ||
	    get_user(tmp1, &uversion->name) ||
	    get_user(tmp2, &uversion->date) ||
	    get_user(tmp3, &uversion->desc))
		return -EFAULT;

	name_ptr = (char *) A(tmp1);
	date_ptr = (char *) A(tmp2);
	desc_ptr = (char *) A(tmp3);

	ret = -ENOMEM;
	if (kversion.name_len && name_ptr) {
		kversion.name = kmalloc(kversion.name_len, GFP_KERNEL);
		if (!kversion.name)
			goto out;
	}
	if (kversion.date_len && date_ptr) {
		kversion.date = kmalloc(kversion.date_len, GFP_KERNEL);
		if (!kversion.date)
			goto out;
	}
	if (kversion.desc_len && desc_ptr) {
		kversion.desc = kmalloc(kversion.desc_len, GFP_KERNEL);
		if (!kversion.desc)
			goto out;
	}

        old_fs = get_fs();
	set_fs(KERNEL_DS);
        ret = sys_ioctl (fd, DRM_IOCTL_VERSION, (unsigned long)&kversion);
        set_fs(old_fs);

	if (!ret) {
		if ((kversion.name &&
		     copy_to_user(name_ptr, kversion.name, kversion.name_len)) ||
		    (kversion.date &&
		     copy_to_user(date_ptr, kversion.date, kversion.date_len)) ||
		    (kversion.desc &&
		     copy_to_user(desc_ptr, kversion.desc, kversion.desc_len)))
			ret = -EFAULT;
		if (put_user(kversion.version_major, &uversion->version_major) ||
		    put_user(kversion.version_minor, &uversion->version_minor) ||
		    put_user(kversion.version_patchlevel, &uversion->version_patchlevel) ||
		    put_user(kversion.name_len, &uversion->name_len) ||
		    put_user(kversion.date_len, &uversion->date_len) ||
		    put_user(kversion.desc_len, &uversion->desc_len))
			ret = -EFAULT;
	}

out:
	if (kversion.name)
		kfree(kversion.name);
	if (kversion.date)
		kfree(kversion.date);
	if (kversion.desc)
		kfree(kversion.desc);
	return ret;
}

typedef struct drm32_unique {
	int	unique_len;	  /* Length of unique			    */
	u32	unique;		  /* Unique name for driver instantiation   */
} drm32_unique_t;
#define DRM32_IOCTL_GET_UNIQUE DRM_IOWR(0x01, drm32_unique_t)
#define DRM32_IOCTL_SET_UNIQUE DRM_IOW( 0x10, drm32_unique_t)

static int drm32_getsetunique(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	drm32_unique_t *uarg = (drm32_unique_t *)arg;
	drm_unique_t karg;
	mm_segment_t old_fs;
	char *uptr;
	u32 tmp;
	int ret;

	if (get_user(karg.unique_len, &uarg->unique_len))
		return -EFAULT;
	karg.unique = NULL;

	if (get_user(tmp, &uarg->unique))
		return -EFAULT;

	uptr = (char *) A(tmp);

	if (uptr) {
		karg.unique = kmalloc(karg.unique_len, GFP_KERNEL);
		if (!karg.unique)
			return -ENOMEM;
		if (cmd == DRM32_IOCTL_SET_UNIQUE &&
		    copy_from_user(karg.unique, uptr, karg.unique_len)) {
			kfree(karg.unique);
			return -EFAULT;
		}
	}

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	if (cmd == DRM32_IOCTL_GET_UNIQUE)
		ret = sys_ioctl (fd, DRM_IOCTL_GET_UNIQUE, (unsigned long)&karg);
	else
		ret = sys_ioctl (fd, DRM_IOCTL_SET_UNIQUE, (unsigned long)&karg);
        set_fs(old_fs);

	if (!ret) {
		if (cmd == DRM32_IOCTL_GET_UNIQUE &&
		    uptr != NULL &&
		    copy_to_user(uptr, karg.unique, karg.unique_len))
			ret = -EFAULT;
		if (put_user(karg.unique_len, &uarg->unique_len))
			ret = -EFAULT;
	}

	if (karg.unique != NULL)
		kfree(karg.unique);

	return ret;
}

typedef struct drm32_map {
	u32		offset;	 /* Requested physical address (0 for SAREA)*/
	u32		size;	 /* Requested physical size (bytes)	    */
	drm_map_type_t	type;	 /* Type of memory to map		    */
	drm_map_flags_t flags;	 /* Flags				    */
	u32		handle;  /* User-space: "Handle" to pass to mmap    */
				 /* Kernel-space: kernel-virtual address    */
	int		mtrr;	 /* MTRR slot used			    */
				 /* Private data			    */
} drm32_map_t;
#define DRM32_IOCTL_ADD_MAP    DRM_IOWR(0x15, drm32_map_t)

static int drm32_addmap(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	drm32_map_t *uarg = (drm32_map_t *) arg;
	drm_map_t karg;
	mm_segment_t old_fs;
	u32 tmp;
	int ret;

	ret  = get_user(karg.offset, &uarg->offset);
	ret |= get_user(karg.size, &uarg->size);
	ret |= get_user(karg.type, &uarg->type);
	ret |= get_user(karg.flags, &uarg->flags);
	ret |= get_user(tmp, &uarg->handle);
	ret |= get_user(karg.mtrr, &uarg->mtrr);
	if (ret)
		return -EFAULT;

	karg.handle = (void *) A(tmp);

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_ioctl(fd, DRM_IOCTL_ADD_MAP, (unsigned long) &karg);
	set_fs(old_fs);

	if (!ret) {
		ret  = put_user(karg.offset, &uarg->offset);
		ret |= put_user(karg.size, &uarg->size);
		ret |= put_user(karg.type, &uarg->type);
		ret |= put_user(karg.flags, &uarg->flags);
		tmp = (u32) (long)karg.handle;
		ret |= put_user(tmp, &uarg->handle);
		ret |= put_user(karg.mtrr, &uarg->mtrr);
		if (ret)
			ret = -EFAULT;
	}

	return ret;
}

typedef struct drm32_buf_info {
	int	       count;	/* Entries in list			     */
	u32	       list;    /* (drm_buf_desc_t *) */ 
} drm32_buf_info_t;
#define DRM32_IOCTL_INFO_BUFS  DRM_IOWR(0x18, drm32_buf_info_t)

static int drm32_info_bufs(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	drm32_buf_info_t *uarg = (drm32_buf_info_t *)arg;
	drm_buf_desc_t *ulist;
	drm_buf_info_t karg;
	mm_segment_t old_fs;
	int orig_count, ret;
	u32 tmp;

	if (get_user(karg.count, &uarg->count) ||
	    get_user(tmp, &uarg->list))
		return -EFAULT;

	ulist = (drm_buf_desc_t *) A(tmp);

	orig_count = karg.count;

	karg.list = kmalloc(karg.count * sizeof(drm_buf_desc_t), GFP_KERNEL);
	if (!karg.list)
		return -EFAULT;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_ioctl(fd, DRM_IOCTL_INFO_BUFS, (unsigned long) &karg);
	set_fs(old_fs);

	if (!ret) {
		if (karg.count <= orig_count &&
		    (copy_to_user(ulist, karg.list,
				  karg.count * sizeof(drm_buf_desc_t))))
			ret = -EFAULT;
		if (put_user(karg.count, &uarg->count))
			ret = -EFAULT;
	}

	kfree(karg.list);

	return ret;
}

typedef struct drm32_buf_free {
	int	       count;
	u32	       list;	/* (int *) */
} drm32_buf_free_t;
#define DRM32_IOCTL_FREE_BUFS  DRM_IOW( 0x1a, drm32_buf_free_t)

static int drm32_free_bufs(unsigned int fd, unsigned int cmd, unsigned long arg)
{
	drm32_buf_free_t *uarg = (drm32_buf_free_t *)arg;
	drm_buf_free_t karg;
	mm_segment_t old_fs;
	int *ulist;
	int ret;
	u32 tmp;

	if (get_user(karg.count, &uarg->count) ||
	    get_user(tmp, &uarg->list))
		return -EFAULT;

	ulist = (int *) A(tmp);

	karg.list = kmalloc(karg.count * sizeof(int), GFP_KERNEL);
	if (!karg.list)
		return -ENOMEM;

	ret = -EFAULT;
	if (copy_from_user(karg.list, ulist, (karg.count * sizeof(int))))
		goto out;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_ioctl(fd, DRM_IOCTL_FREE_BUFS, (unsigned long) &karg);
	set_fs(old_fs);

out:
	kfree(karg.list);

	return ret;
}

typedef struct drm32_buf_pub {
	int		  idx;	       /* Index into master buflist	     */