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

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;
+}