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/* agpsupport-pre24.h -- Support for pre-2.4.0 kernels -*- linux-c -*-
* Created: Mon Nov 13 10:54:15 2000 by faith@valinux.com
*
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* 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
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Rickard E. (Rik) Faith <faith@valinux.com>
*
*/
#ifndef _AGPSUPPORT_PRE24_H_
#define _AGPSUPPORT_PRE24_H_
typedef struct {
void (*free_memory)(agp_memory *);
agp_memory *(*allocate_memory)(size_t, u32);
int (*bind_memory)(agp_memory *, off_t);
int (*unbind_memory)(agp_memory *);
void (*enable)(u32);
int (*acquire)(void);
void (*release)(void);
void (*copy_info)(agp_kern_info *);
} drm_agp_t;
static drm_agp_t drm_agp_struct = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
/* The C standard says that 'void *' is not guaranteed to hold a function
pointer, so we use this union to define a generic pointer that is
guaranteed to hold any of the function pointers we care about. */
typedef union {
void (*free_memory)(agp_memory *);
agp_memory *(*allocate_memory)(size_t, u32);
int (*bind_memory)(agp_memory *, off_t);
int (*unbind_memory)(agp_memory *);
void (*enable)(u32);
int (*acquire)(void);
void (*release)(void);
void (*copy_info)(agp_kern_info *);
unsigned long address;
} drm_agp_func_u;
typedef struct drm_agp_fill {
const char *name;
drm_agp_func_u *f;
} drm_agp_fill_t;
static drm_agp_fill_t drm_agp_fill[] = {
{ __MODULE_STRING(agp_free_memory),
(drm_agp_func_u *)&drm_agp_struct.free_memory },
{ __MODULE_STRING(agp_allocate_memory),
(drm_agp_func_u *)&drm_agp_struct.allocate_memory },
{ __MODULE_STRING(agp_bind_memory),
(drm_agp_func_u *)&drm_agp_struct.bind_memory },
{ __MODULE_STRING(agp_unbind_memory),
(drm_agp_func_u *)&drm_agp_struct.unbind_memory },
{ __MODULE_STRING(agp_enable),
(drm_agp_func_u *)&drm_agp_struct.enable },
{ __MODULE_STRING(agp_backend_acquire),
(drm_agp_func_u *)&drm_agp_struct.acquire },
{ __MODULE_STRING(agp_backend_release),
(drm_agp_func_u *)&drm_agp_struct.release },
{ __MODULE_STRING(agp_copy_info),
(drm_agp_func_u *)&drm_agp_struct.copy_info },
{ NULL, NULL }
};
#define DRM_AGP_GET _drm_agp_get()
#define DRM_AGP_PUT _drm_agp_put()
static drm_agp_t *_drm_agp_get(void)
{
drm_agp_fill_t *fill;
int agp_available = 1;
for (fill = &drm_agp_fill[0]; fill->name; fill++) {
char *n = (char *)fill->name;
*fill->f = (drm_agp_func_u)get_module_symbol(NULL, n);
DRM_DEBUG("%s resolves to 0x%08lx\n", n, (*fill->f).address);
if (!(*fill->f).address) agp_available = 0;
}
return &drm_agp_struct;
}
static void _drm_agp_put(void)
{
drm_agp_fill_t *fill;
for (fill = &drm_agp_fill[0]; fill->name; fill++) {
#if LINUX_VERSION_CODE >= 0x020400
if ((*fill->f).address) put_module_symbol((*fill->f).address);
#endif
(*fill->f).address = 0;
}
}
#endif
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