kolibrios/drivers/video/drm/i915/kos_fb.c

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/*
* Copyright <EFBFBD> 2008-2012 Intel Corporation
*
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include <display.h>
#include "intel_drv.h"
#include "i915_drv.h"
static addr_t dummy_fb_page;
static struct kos_framebuffer *fake_fb;
int fake_framebuffer_create()
{
struct kos_framebuffer *kfb;
addr_t dummy_table;
addr_t *pt_addr;
int pde, pte;
kfb = kzalloc(sizeof(struct kos_framebuffer),0);
if(kfb == NULL)
goto err_0;
dummy_fb_page = AllocPage();
if(dummy_fb_page == 0)
goto err_1;
for(pde = 0; pde < 8; pde++)
{
dummy_table = AllocPage();
if(dummy_table == 0)
goto err_2;
kfb->pde[pde] = dummy_table|PG_UW;
pt_addr = kmap_atomic((struct page*)dummy_table);
for(pte = 0; pte < 1024; pte++)
pt_addr[pte] = dummy_fb_page|PG_UW;
kunmap_atomic(pt_addr);
};
fake_fb = kfb;
return 0;
err_2:
for(pte = 0; pte < pde; pte++)
FreePage(kfb->pde[pte]);
FreePage(dummy_fb_page);
err_1:
kfree(kfb);
err_0:
return -ENOMEM;
};
int kolibri_framebuffer_init(void *param)
{
struct intel_framebuffer *intel_fb = param;
struct kos_framebuffer *kfb;
addr_t dummy_table;
addr_t *pt_addr = NULL;
int pde, pte;
kfb = kzalloc(sizeof(struct kos_framebuffer),0);
if(kfb == NULL)
goto err_0;
kfb->private = intel_fb;
for(pde = 0; pde < 8; pde++)
{
dummy_table = AllocPage();
if(dummy_table == 0)
goto err_1;
kfb->pde[pde] = dummy_table|PG_UW;
pt_addr = kmap_atomic((struct page*)dummy_table);
for(pte = 0; pte < 1024; pte++)
pt_addr[pte] = dummy_fb_page|PG_UW;
kunmap_atomic(pt_addr);
};
intel_fb->private = kfb;
return 0;
err_1:
for(pte = 0; pte < pde; pte++)
FreePage(kfb->pde[pte]);
kfree(kfb);
err_0:
return -ENOMEM;
};
void kolibri_framebuffer_update(struct drm_device *dev, struct kos_framebuffer *kfb)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_framebuffer *intel_fb = kfb->private;
addr_t *pt_addr = NULL;
int pte = 0;
int pde = 0;
int num_pages;
addr_t pfn;
num_pages = intel_fb->obj->base.size/4096;
pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(intel_fb->obj);
while(num_pages)
{
if (pt_addr == NULL)
{
addr_t pt = kfb->pde[pde] & 0xFFFFF000;
pde++;
pt_addr = kmap_atomic((struct page*)pt);
}
pt_addr[pte] = pfn|PG_UW|PG_WRITEC;
pfn+= 4096;
num_pages--;
if (++pte == 1024)
{
kunmap_atomic(pt_addr);
pt_addr = NULL;
if (pde == 8)
break;
pte = 0;
}
}
if(pt_addr)
{
for(; pte < 1024; pte++)
pt_addr[pte] = dummy_fb_page|PG_UW;
kunmap_atomic(pt_addr);
};
for(; pde < 8; pde++)
{
addr_t pt = kfb->pde[pde] & 0xFFFFF000;
pt_addr = kmap_atomic((struct page*)pt);
for(pte = 0; pte < 1024; pte++)
pt_addr[pte] = dummy_fb_page|PG_UW;
kunmap_atomic(pt_addr);
}
};
void set_fake_framebuffer()
{
sysSetFramebuffer(fake_fb);
}