Add access control support to qemu bridge helper
[qemu.git] / hw / framebuffer.c
1 /*
2 * Framebuffer device helper routines
3 *
4 * Copyright (c) 2009 CodeSourcery
5 * Written by Paul Brook <paul@codesourcery.com>
6 *
7 * This code is licensed under the GNU GPLv2.
8 *
9 * Contributions after 2012-01-13 are licensed under the terms of the
10 * GNU GPL, version 2 or (at your option) any later version.
11 */
12
13 /* TODO:
14 - Do something similar for framebuffers with local ram
15 - Handle rotation here instead of hacking dest_pitch
16 - Use common pixel conversion routines instead of per-device drawfn
17 - Remove all DisplayState knowledge from devices.
18 */
19
20 #include "hw.h"
21 #include "console.h"
22 #include "framebuffer.h"
23
24 /* Render an image from a shared memory framebuffer. */
25
26 void framebuffer_update_display(
27 DisplayState *ds,
28 MemoryRegion *address_space,
29 target_phys_addr_t base,
30 int cols, /* Width in pixels. */
31 int rows, /* Leight in pixels. */
32 int src_width, /* Length of source line, in bytes. */
33 int dest_row_pitch, /* Bytes between adjacent horizontal output pixels. */
34 int dest_col_pitch, /* Bytes between adjacent vertical output pixels. */
35 int invalidate, /* nonzero to redraw the whole image. */
36 drawfn fn,
37 void *opaque,
38 int *first_row, /* Input and output. */
39 int *last_row /* Output only */)
40 {
41 target_phys_addr_t src_len;
42 uint8_t *dest;
43 uint8_t *src;
44 uint8_t *src_base;
45 int first, last = 0;
46 int dirty;
47 int i;
48 ram_addr_t addr;
49 MemoryRegionSection mem_section;
50 MemoryRegion *mem;
51
52 i = *first_row;
53 *first_row = -1;
54 src_len = src_width * rows;
55
56 mem_section = memory_region_find(address_space, base, src_len);
57 if (mem_section.size != src_len || !memory_region_is_ram(mem_section.mr)) {
58 return;
59 }
60 mem = mem_section.mr;
61 assert(mem);
62 assert(mem_section.offset_within_address_space == base);
63
64 memory_region_sync_dirty_bitmap(mem);
65 src_base = cpu_physical_memory_map(base, &src_len, 0);
66 /* If we can't map the framebuffer then bail. We could try harder,
67 but it's not really worth it as dirty flag tracking will probably
68 already have failed above. */
69 if (!src_base)
70 return;
71 if (src_len != src_width * rows) {
72 cpu_physical_memory_unmap(src_base, src_len, 0, 0);
73 return;
74 }
75 src = src_base;
76 dest = ds_get_data(ds);
77 if (dest_col_pitch < 0)
78 dest -= dest_col_pitch * (cols - 1);
79 if (dest_row_pitch < 0) {
80 dest -= dest_row_pitch * (rows - 1);
81 }
82 first = -1;
83 addr = mem_section.offset_within_region;
84
85 addr += i * src_width;
86 src += i * src_width;
87 dest += i * dest_row_pitch;
88
89 for (; i < rows; i++) {
90 target_phys_addr_t dirty_offset;
91 dirty = 0;
92 dirty_offset = 0;
93 while (addr + dirty_offset < TARGET_PAGE_ALIGN(addr + src_width)) {
94 dirty |= memory_region_get_dirty(mem, addr + dirty_offset,
95 DIRTY_MEMORY_VGA);
96 dirty_offset += TARGET_PAGE_SIZE;
97 }
98
99 if (dirty || invalidate) {
100 fn(opaque, dest, src, cols, dest_col_pitch);
101 if (first == -1)
102 first = i;
103 last = i;
104 }
105 addr += src_width;
106 src += src_width;
107 dest += dest_row_pitch;
108 }
109 cpu_physical_memory_unmap(src_base, src_len, 0, 0);
110 if (first < 0) {
111 return;
112 }
113 memory_region_reset_dirty(mem, mem_section.offset_within_region, src_len,
114 DIRTY_MEMORY_VGA);
115 *first_row = first;
116 *last_row = last;
117 return;
118 }