drm/linux/drm_agpsupport.h

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/**
* \file drm_agpsupport.h
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* DRM support for AGP/GART backend
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
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*/
#include "drmP.h"
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#include <linux/module.h>
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#if __OS_HAS_AGP
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#define DRM_AGP_GET (drm_agp_t *)inter_module_get("drm_agp")
#define DRM_AGP_PUT inter_module_put("drm_agp")
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/**
* Pointer to the drm_agp_t structure made available by the agpgart module.
*/
static const drm_agp_t *drm_agp = NULL;
/**
* AGP information ioctl.
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a (output) drm_agp_info structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device has been initialized and acquired and fills in the
* drm_agp_info structure with the information in drm_agp_head::agp_info.
*/
int DRM(agp_info)(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
DRM_AGP_KERN *kern;
drm_agp_info_t info;
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if (!dev->agp || !dev->agp->acquired || !drm_agp->copy_info)
return -EINVAL;
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kern = &dev->agp->agp_info;
info.agp_version_major = kern->version.major;
info.agp_version_minor = kern->version.minor;
info.mode = kern->mode;
info.aperture_base = kern->aper_base;
info.aperture_size = kern->aper_size * 1024 * 1024;
info.memory_allowed = kern->max_memory << PAGE_SHIFT;
info.memory_used = kern->current_memory << PAGE_SHIFT;
info.id_vendor = kern->device->vendor;
info.id_device = kern->device->device;
if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
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/**
* Acquire the AGP device (ioctl).
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg user argument.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device hasn't been acquired before and calls
* drm_agp->acquire().
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*/
int DRM(agp_acquire)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
int retcode;
if (!dev->agp)
return -ENODEV;
if (dev->agp->acquired)
return -EBUSY;
if (!drm_agp->acquire)
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return -EINVAL;
#ifndef VMAP_4_ARGS
if ( dev->agp->cant_use_aperture )
return -EINVAL;
#endif
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if ((retcode = drm_agp->acquire()))
return retcode;
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dev->agp->acquired = 1;
return 0;
}
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/**
* Release the AGP device (ioctl).
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg user argument.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device has been acquired and calls drm_agp->release().
*/
int DRM(agp_release)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
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if (!dev->agp || !dev->agp->acquired || !drm_agp->release)
return -EINVAL;
drm_agp->release();
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dev->agp->acquired = 0;
return 0;
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}
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/**
* Release the AGP device.
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*
* Calls drm_agp->release().
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*/
void DRM(agp_do_release)(void)
{
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if (drm_agp->release)
drm_agp->release();
}
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/**
* Enable the AGP bus.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_agp_mode structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device has been acquired but not enabled, and calls
* drm_agp->enable().
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*/
int DRM(agp_enable)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_agp_mode_t mode;
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if (!dev->agp || !dev->agp->acquired || !drm_agp->enable)
return -EINVAL;
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if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode)))
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return -EFAULT;
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dev->agp->mode = mode.mode;
drm_agp->enable(mode.mode);
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dev->agp->base = dev->agp->agp_info.aper_base;
dev->agp->enabled = 1;
return 0;
}
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/**
* Allocate AGP memory.
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_agp_buffer structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device is present and has been acquired, allocates the
* memory via alloc_agp() and creates a drm_agp_mem entry for it.
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*/
int DRM(agp_alloc)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_agp_buffer_t request;
drm_agp_mem_t *entry;
DRM_AGP_MEM *memory;
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unsigned long pages;
u32 type;
drm_agp_buffer_t __user *argp = (void __user *)arg;
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if (!dev->agp || !dev->agp->acquired)
return -EINVAL;
if (copy_from_user(&request, argp, sizeof(request)))
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return -EFAULT;
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if (!(entry = DRM(alloc)(sizeof(*entry), DRM_MEM_AGPLISTS)))
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return -ENOMEM;
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memset(entry, 0, sizeof(*entry));
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pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
type = (u32) request.type;
if (!(memory = DRM(alloc_agp)(pages, type))) {
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DRM(free)(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return -ENOMEM;
}
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entry->handle = (unsigned long)memory->key + 1;
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entry->memory = memory;
entry->bound = 0;
entry->pages = pages;
entry->prev = NULL;
entry->next = dev->agp->memory;
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if (dev->agp->memory)
dev->agp->memory->prev = entry;
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dev->agp->memory = entry;
request.handle = entry->handle;
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request.physical = memory->physical;
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if (copy_to_user(argp, &request, sizeof(request))) {
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dev->agp->memory = entry->next;
dev->agp->memory->prev = NULL;
DRM(free_agp)(memory, pages);
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DRM(free)(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return -EFAULT;
}
return 0;
}
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/**
* Search for the AGP memory entry associated with a handle.
*
* \param dev DRM device structure.
* \param handle AGP memory handle.
* \return pointer to the drm_agp_mem structure associated with \p handle.
*
* Walks through drm_agp_head::memory until finding a matching handle.
*/
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static drm_agp_mem_t *DRM(agp_lookup_entry)(drm_device_t *dev,
unsigned long handle)
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{
drm_agp_mem_t *entry;
for (entry = dev->agp->memory; entry; entry = entry->next) {
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if (entry->handle == handle)
return entry;
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}
return NULL;
}
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/**
* Unbind AGP memory from the GATT (ioctl).
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_agp_binding structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device is present and acquired, looks-up the AGP memory
* entry and passes it to the unbind_agp() function.
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*/
int DRM(agp_unbind)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_agp_binding_t request;
drm_agp_mem_t *entry;
int ret;
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if (!dev->agp || !dev->agp->acquired)
return -EINVAL;
if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = DRM(agp_lookup_entry)(dev, request.handle)))
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return -EINVAL;
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if (!entry->bound)
return -EINVAL;
ret = DRM(unbind_agp)(entry->memory);
if (ret == 0)
entry->bound = 0;
return ret;
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}
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/**
* Bind AGP memory into the GATT (ioctl)
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_agp_binding structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device is present and has been acquired and that no memory
* is currently bound into the GATT. Looks-up the AGP memory entry and passes
* it to bind_agp() function.
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*/
int DRM(agp_bind)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_agp_binding_t request;
drm_agp_mem_t *entry;
int retcode;
int page;
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if (!dev->agp || !dev->agp->acquired || !drm_agp->bind_memory)
return -EINVAL;
if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = DRM(agp_lookup_entry)(dev, request.handle)))
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return -EINVAL;
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if (entry->bound)
return -EINVAL;
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page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
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if ((retcode = DRM(bind_agp)(entry->memory, page)))
return retcode;
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entry->bound = dev->agp->base + (page << PAGE_SHIFT);
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DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
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dev->agp->base, entry->bound);
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return 0;
}
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/**
* Free AGP memory (ioctl).
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*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg pointer to a drm_agp_buffer structure.
* \return zero on success or a negative number on failure.
*
* Verifies the AGP device is present and has been acquired and looks up the
* AGP memory entry. If the memory it's currently bound, unbind it via
* unbind_agp(). Frees it via free_agp() as well as the entry itself
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* and unlinks from the doubly linked list it's inserted in.
*/
int DRM(agp_free)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_agp_buffer_t request;
drm_agp_mem_t *entry;
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if (!dev->agp || !dev->agp->acquired)
return -EINVAL;
if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = DRM(agp_lookup_entry)(dev, request.handle)))
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return -EINVAL;
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if (entry->bound)
DRM(unbind_agp)(entry->memory);
if (entry->prev)
entry->prev->next = entry->next;
else
dev->agp->memory = entry->next;
if (entry->next)
entry->next->prev = entry->prev;
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DRM(free_agp)(entry->memory, entry->pages);
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DRM(free)(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return 0;
}
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/**
* Initialize the AGP resources.
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*
* \return pointer to a drm_agp_head structure.
*
* Gets the drm_agp_t structure which is made available by the agpgart module
* via the inter_module_* functions. Creates and initializes a drm_agp_head
* structure.
*/
drm_agp_head_t *DRM(agp_init)(void)
{
drm_agp_head_t *head = NULL;
drm_agp = DRM_AGP_GET;
if (drm_agp) {
if (!(head = DRM(alloc)(sizeof(*head), DRM_MEM_AGPLISTS)))
return NULL;
memset((void *)head, 0, sizeof(*head));
drm_agp->copy_info(&head->agp_info);
if (head->agp_info.chipset == NOT_SUPPORTED) {
DRM(free)(head, sizeof(*head), DRM_MEM_AGPLISTS);
return NULL;
}
head->memory = NULL;
#if LINUX_VERSION_CODE <= 0x020408
head->cant_use_aperture = 0;
head->page_mask = ~(0xfff);
#else
head->cant_use_aperture = head->agp_info.cant_use_aperture;
head->page_mask = head->agp_info.page_mask;
#endif
}
return head;
}
/**
* Free the AGP resources.
*
* Releases the pointer in ::drm_agp.
*/
void DRM(agp_uninit)(void)
{
DRM_AGP_PUT;
drm_agp = NULL;
}
/** Calls drm_agp->allocate_memory() */
DRM_AGP_MEM *DRM(agp_allocate_memory)(size_t pages, u32 type)
{
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if (!drm_agp->allocate_memory)
return NULL;
return drm_agp->allocate_memory(pages, type);
}
/** Calls drm_agp->free_memory() */
int DRM(agp_free_memory)(DRM_AGP_MEM *handle)
{
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if (!handle || !drm_agp->free_memory)
return 0;
drm_agp->free_memory(handle);
return 1;
}
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/** Calls drm_agp->bind_memory() */
int DRM(agp_bind_memory)(DRM_AGP_MEM *handle, off_t start)
{
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if (!handle || !drm_agp->bind_memory)
return -EINVAL;
return drm_agp->bind_memory(handle, start);
}
/** Calls drm_agp->unbind_memory() */
int DRM(agp_unbind_memory)(DRM_AGP_MEM *handle)
{
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if (!handle || !drm_agp->unbind_memory)
return -EINVAL;
return drm_agp->unbind_memory(handle);
}
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#endif /* __OS_HAS_AGP */