127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/*
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* Simple frame buffer
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*
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* Copyright (c) 2017 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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 shall be included in
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* 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
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <inttypes.h>
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#include <assert.h>
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#include "cutils.h"
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#include "iomem.h"
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#include "virtio.h"
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#include "machine.h"
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//#define DEBUG_VBE
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#define FB_ALLOC_ALIGN 65536
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struct SimpleFBState {
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FBDevice *fb_dev;
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int fb_page_count;
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PhysMemoryRange *mem_range;
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};
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#define MAX_MERGE_DISTANCE 3
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void simplefb_refresh(FBDevice *fb_dev,
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SimpleFBDrawFunc *redraw_func, void *opaque,
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PhysMemoryRange *mem_range,
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int fb_page_count)
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{
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const uint32_t *dirty_bits;
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uint32_t dirty_val;
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int y0, y1, page_y0, page_y1, byte_pos, page_index, bit_pos;
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dirty_bits = phys_mem_get_dirty_bits(mem_range);
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page_index = 0;
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y0 = y1 = 0;
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while (page_index < fb_page_count) {
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dirty_val = dirty_bits[page_index >> 5];
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if (dirty_val != 0) {
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bit_pos = 0;
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while (dirty_val != 0) {
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while (((dirty_val >> bit_pos) & 1) == 0)
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bit_pos++;
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dirty_val &= ~(1 << bit_pos);
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byte_pos = (page_index + bit_pos) * DEVRAM_PAGE_SIZE;
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page_y0 = byte_pos / fb_dev->stride;
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page_y1 = ((byte_pos + DEVRAM_PAGE_SIZE - 1) / fb_dev->stride) + 1;
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page_y1 = min_int(page_y1, fb_dev->height);
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if (y0 == y1) {
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y0 = page_y0;
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y1 = page_y1;
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} else if (page_y0 <= (y1 + MAX_MERGE_DISTANCE)) {
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/* union with current region */
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y1 = page_y1;
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} else {
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/* flush */
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redraw_func(fb_dev, opaque,
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0, y0, fb_dev->width, y1 - y0);
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y0 = page_y0;
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y1 = page_y1;
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}
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}
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}
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page_index += 32;
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}
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if (y0 != y1) {
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redraw_func(fb_dev, opaque,
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0, y0, fb_dev->width, y1 - y0);
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}
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}
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static void simplefb_refresh1(FBDevice *fb_dev,
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SimpleFBDrawFunc *redraw_func, void *opaque)
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{
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SimpleFBState *s = fb_dev->device_opaque;
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simplefb_refresh(fb_dev, redraw_func, opaque, s->mem_range,
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s->fb_page_count);
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}
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SimpleFBState *simplefb_init(PhysMemoryMap *map, uint64_t phys_addr,
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FBDevice *fb_dev, int width, int height)
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{
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SimpleFBState *s;
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s = mallocz(sizeof(*s));
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s->fb_dev = fb_dev;
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fb_dev->width = width;
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fb_dev->height = height;
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fb_dev->stride = width * 4;
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fb_dev->fb_size = (height * fb_dev->stride + FB_ALLOC_ALIGN - 1) & ~(FB_ALLOC_ALIGN - 1);
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s->fb_page_count = fb_dev->fb_size >> DEVRAM_PAGE_SIZE_LOG2;
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s->mem_range = cpu_register_ram(map, phys_addr, fb_dev->fb_size,
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DEVRAM_FLAG_DIRTY_BITS);
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fb_dev->fb_data = s->mem_range->phys_mem;
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fb_dev->device_opaque = s;
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fb_dev->refresh = simplefb_refresh1;
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return s;
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}
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