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Diffstat (limited to 'linux/agpsupport-pre24.h')
| -rw-r--r-- | linux/agpsupport-pre24.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/linux/agpsupport-pre24.h b/linux/agpsupport-pre24.h new file mode 100644 index 00000000..abcf9f51 --- /dev/null +++ b/linux/agpsupport-pre24.h @@ -0,0 +1,115 @@ +/* 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 |