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authorpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-01 12:27:59 +0000
committerpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-01 12:27:59 +0000
commit714fa308a3f86e1dc55021ff1282c1afe6954d3d (patch)
tree9377d95debe17aeda17cbcc2042ffff1f9ff59d0 /hw/framebuffer.c
parent602dafcf43d8a35ff77e33377c1f258515812e5b (diff)
Implement and use shared memory framebuffer device rendering reoutine.
Use DMA mapping API. Signed-off-by: Paul Brook <paul@codesourcery.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6965 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/framebuffer.c')
-rw-r--r--hw/framebuffer.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/hw/framebuffer.c b/hw/framebuffer.c
new file mode 100644
index 000000000..1086ba9d0
--- /dev/null
+++ b/hw/framebuffer.c
@@ -0,0 +1,119 @@
+/*
+ * Framebuffer device helper routines
+ *
+ * Copyright (c) 2009 CodeSourcery
+ * Written by Paul Brook <paul@codesourcery.com>
+ *
+ * This code is licensed under the GNU GPLv2.
+ */
+
+/* TODO:
+ - Do something similar for framebuffers with local ram
+ - Handle rotation here instead of hacking dest_pitch
+ - Use common pixel conversion routines instead of per-device drawfn
+ - Remove all DisplayState knowledge from devices.
+ */
+
+#include "hw.h"
+#include "console.h"
+#include "framebuffer.h"
+#include "kvm.h"
+
+/* Render an image from a shared memory framebuffer. */
+
+void framebuffer_update_display(
+ DisplayState *ds,
+ target_phys_addr_t base,
+ int cols, /* Width in pixels. */
+ int rows, /* Leight in pixels. */
+ int src_width, /* Length of source line, in bytes. */
+ int dest_row_pitch, /* Bytes between adjacent horizontal output pixels. */
+ int dest_col_pitch, /* Bytes between adjacent vertical output pixels. */
+ int invalidate, /* nonzero to redraw the whole image. */
+ drawfn fn,
+ void *opaque,
+ int *first_row, /* Input and output. */
+ int *last_row /* Output only */)
+{
+ target_phys_addr_t src_len;
+ uint8_t *dest;
+ uint8_t *src;
+ uint8_t *src_base;
+ int first, last = 0;
+ int dirty;
+ int i;
+ ram_addr_t addr;
+ ram_addr_t pd;
+ ram_addr_t pd2;
+
+ i = *first_row;
+ *first_row = -1;
+ src_len = src_width * rows;
+
+ if (kvm_enabled()) {
+ kvm_physical_sync_dirty_bitmap(base, src_len);
+ }
+ pd = cpu_get_physical_page_desc(base);
+ pd2 = cpu_get_physical_page_desc(base + src_len - 1);
+ /* We should reall check that this is a continuous ram region.
+ Instead we just check that the first and last pages are
+ both ram, and the right distance apart. */
+ if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM
+ || (pd2 & ~TARGET_PAGE_MASK) > IO_MEM_ROM) {
+ return;
+ }
+ pd = (pd & TARGET_PAGE_MASK) + (base & ~TARGET_PAGE_MASK);
+ if (((pd + src_len - 1) & TARGET_PAGE_MASK) != (pd2 & TARGET_PAGE_MASK)) {
+ return;
+ }
+
+ src_base = cpu_physical_memory_map(base, &src_len, 0);
+ /* If we can't map the framebuffer then bail. We could try harder,
+ but it's not really worth it as dirty flag tracking will probably
+ already have failed above. */
+ if (!src_base)
+ return;
+ if (src_len != src_width * rows) {
+ cpu_physical_memory_unmap(src_base, src_len, 0, 0);
+ return;
+ }
+ src = src_base;
+ dest = ds_get_data(ds);
+ if (dest_col_pitch < 0)
+ dest -= dest_col_pitch * (cols - 1);
+ first = -1;
+ addr = pd;
+
+ addr += i * src_width;
+ src += i * src_width;
+ dest += i * dest_row_pitch;
+
+ for (; i < rows; i++) {
+ target_phys_addr_t dirty_offset;
+ dirty = 0;
+ dirty_offset = 0;
+ while (addr + dirty_offset < TARGET_PAGE_ALIGN(addr + src_width)) {
+ dirty |= cpu_physical_memory_get_dirty(addr + dirty_offset,
+ VGA_DIRTY_FLAG);
+ dirty_offset += TARGET_PAGE_SIZE;
+ }
+
+ if (dirty || invalidate) {
+ fn(opaque, dest, src, cols, dest_col_pitch);
+ if (first == -1)
+ first = i;
+ last = i;
+ }
+ addr += src_width;
+ src += src_width;
+ dest += dest_row_pitch;
+ }
+ cpu_physical_memory_unmap(src_base, src_len, 0, 0);
+ if (first < 0) {
+ return;
+ }
+ cpu_physical_memory_reset_dirty(pd, pd + src_len, VGA_DIRTY_FLAG);
+ *first_row = first;
+ *last_row = last;
+ return;
+}