Blame SOURCES/kvm-vga-stop-passing-pointers-to-vga_draw_line-functions.patch

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From e56700784b7585dddff0713ea52b2b00b8531b7f Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Thu, 5 Oct 2017 14:51:19 +0200
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Subject: [PATCH 23/27] vga: stop passing pointers to vga_draw_line* functions
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <20171005145119.15277-8-kraxel@redhat.com>
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Patchwork-id: 76828
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O-Subject: [RHEL-7.5 qemu-kvm PATCH 7/7] vga: stop passing pointers to vga_draw_line* functions
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Bugzilla: 1486642
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Instead pass around the address (aka offset into vga memory).
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Add vga_read_* helper functions which apply vbe_size_mask to
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the address, to make sure the address stays within the valid
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range, similar to the cirrus blitter fixes (commits ffaf857778
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and 026aeffcb4).
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Impact:  DoS for privileged guest users.  qemu crashes with
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a segfault, when hitting the guard page after vga memory
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allocation, while reading vga memory for display updates.
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Fixes: CVE-2017-13672
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Cc: P J P <ppandit@redhat.com>
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Reported-by: David Buchanan <d@vidbuchanan.co.uk>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: 20170828122906.18993-1-kraxel@redhat.com
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(cherry picked from commit 3d90c6254863693a6b13d918d2b8682e08bbc681)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/display/vga-helpers.h | 202 ++++++++++++++++++++++++++---------------------
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 hw/display/vga.c         |   5 +-
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 hw/display/vga_int.h     |   1 +
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 3 files changed, 114 insertions(+), 94 deletions(-)
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diff --git a/hw/display/vga-helpers.h b/hw/display/vga-helpers.h
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index 94f6de2..5a752b3 100644
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--- a/hw/display/vga-helpers.h
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+++ b/hw/display/vga-helpers.h
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@@ -95,20 +95,46 @@ static void vga_draw_glyph9(uint8_t *d, int linesize,
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     } while (--h);
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 }
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+static inline uint8_t vga_read_byte(VGACommonState *vga, uint32_t addr)
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+{
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+    return vga->vram_ptr[addr & vga->vbe_size_mask];
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+}
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+
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+static inline uint16_t vga_read_word_le(VGACommonState *vga, uint32_t addr)
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+{
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+    uint32_t offset = addr & vga->vbe_size_mask & ~1;
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+    uint16_t *ptr = (uint16_t *)(vga->vram_ptr + offset);
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+    return lduw_le_p(ptr);
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+}
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+
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+static inline uint16_t vga_read_word_be(VGACommonState *vga, uint32_t addr)
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+{
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+    uint32_t offset = addr & vga->vbe_size_mask & ~1;
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+    uint16_t *ptr = (uint16_t *)(vga->vram_ptr + offset);
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+    return lduw_be_p(ptr);
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+}
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+
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+static inline uint32_t vga_read_dword_le(VGACommonState *vga, uint32_t addr)
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+{
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+    uint32_t offset = addr & vga->vbe_size_mask & ~3;
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+    uint32_t *ptr = (uint32_t *)(vga->vram_ptr + offset);
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+    return ldl_le_p(ptr);
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+}
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+
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 /*
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  * 4 color mode
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  */
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-static void vga_draw_line2(VGACommonState *s1, uint8_t *d,
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-                           const uint8_t *s, int width)
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+static void vga_draw_line2(VGACommonState *vga, uint8_t *d,
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+                           uint32_t addr, int width)
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 {
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     uint32_t plane_mask, *palette, data, v;
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     int x;
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-    palette = s1->last_palette;
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-    plane_mask = mask16[s1->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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+    palette = vga->last_palette;
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+    plane_mask = mask16[vga->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        data = ((uint32_t *)s)[0];
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+        data = vga_read_dword_le(vga, addr);
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         data &= plane_mask;
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         v = expand2[GET_PLANE(data, 0)];
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         v |= expand2[GET_PLANE(data, 2)] << 2;
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@@ -124,7 +150,7 @@ static void vga_draw_line2(VGACommonState *s1, uint8_t *d,
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         ((uint32_t *)d)[6] = palette[(v >> 4) & 0xf];
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         ((uint32_t *)d)[7] = palette[(v >> 0) & 0xf];
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         d += 32;
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-        s += 4;
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+        addr += 4;
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     }
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 }
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@@ -134,17 +160,17 @@ static void vga_draw_line2(VGACommonState *s1, uint8_t *d,
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 /*
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  * 4 color mode, dup2 horizontal
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  */
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-static void vga_draw_line2d2(VGACommonState *s1, uint8_t *d,
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-                             const uint8_t *s, int width)
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+static void vga_draw_line2d2(VGACommonState *vga, uint8_t *d,
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+                             uint32_t addr, int width)
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 {
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     uint32_t plane_mask, *palette, data, v;
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     int x;
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-    palette = s1->last_palette;
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-    plane_mask = mask16[s1->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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+    palette = vga->last_palette;
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+    plane_mask = mask16[vga->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        data = ((uint32_t *)s)[0];
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+        data = vga_read_dword_le(vga, addr);
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         data &= plane_mask;
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         v = expand2[GET_PLANE(data, 0)];
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         v |= expand2[GET_PLANE(data, 2)] << 2;
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@@ -160,24 +186,24 @@ static void vga_draw_line2d2(VGACommonState *s1, uint8_t *d,
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         PUT_PIXEL2(d, 6, palette[(v >> 4) & 0xf]);
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         PUT_PIXEL2(d, 7, palette[(v >> 0) & 0xf]);
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         d += 64;
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-        s += 4;
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+        addr += 4;
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     }
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 }
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 /*
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  * 16 color mode
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  */
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-static void vga_draw_line4(VGACommonState *s1, uint8_t *d,
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-                           const uint8_t *s, int width)
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+static void vga_draw_line4(VGACommonState *vga, uint8_t *d,
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+                           uint32_t addr, int width)
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 {
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     uint32_t plane_mask, data, v, *palette;
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     int x;
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-    palette = s1->last_palette;
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-    plane_mask = mask16[s1->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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+    palette = vga->last_palette;
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+    plane_mask = mask16[vga->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        data = ((uint32_t *)s)[0];
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+        data = vga_read_dword_le(vga, addr);
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         data &= plane_mask;
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         v = expand4[GET_PLANE(data, 0)];
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         v |= expand4[GET_PLANE(data, 1)] << 1;
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@@ -192,24 +218,24 @@ static void vga_draw_line4(VGACommonState *s1, uint8_t *d,
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         ((uint32_t *)d)[6] = palette[(v >> 4) & 0xf];
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         ((uint32_t *)d)[7] = palette[(v >> 0) & 0xf];
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         d += 32;
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-        s += 4;
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+        addr += 4;
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     }
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 }
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 /*
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  * 16 color mode, dup2 horizontal
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  */
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-static void vga_draw_line4d2(VGACommonState *s1, uint8_t *d,
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-                             const uint8_t *s, int width)
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+static void vga_draw_line4d2(VGACommonState *vga, uint8_t *d,
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+                             uint32_t addr, int width)
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 {
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     uint32_t plane_mask, data, v, *palette;
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     int x;
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-    palette = s1->last_palette;
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-    plane_mask = mask16[s1->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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+    palette = vga->last_palette;
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+    plane_mask = mask16[vga->ar[VGA_ATC_PLANE_ENABLE] & 0xf];
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        data = ((uint32_t *)s)[0];
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+        data = vga_read_dword_le(vga, addr);
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         data &= plane_mask;
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         v = expand4[GET_PLANE(data, 0)];
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         v |= expand4[GET_PLANE(data, 1)] << 1;
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@@ -224,7 +250,7 @@ static void vga_draw_line4d2(VGACommonState *s1, uint8_t *d,
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         PUT_PIXEL2(d, 6, palette[(v >> 4) & 0xf]);
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         PUT_PIXEL2(d, 7, palette[(v >> 0) & 0xf]);
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         d += 64;
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-        s += 4;
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+        addr += 4;
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     }
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 }
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@@ -233,21 +259,21 @@ static void vga_draw_line4d2(VGACommonState *s1, uint8_t *d,
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  *
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  * XXX: add plane_mask support (never used in standard VGA modes)
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  */
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-static void vga_draw_line8d2(VGACommonState *s1, uint8_t *d,
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-                             const uint8_t *s, int width)
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+static void vga_draw_line8d2(VGACommonState *vga, uint8_t *d,
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+                             uint32_t addr, int width)
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 {
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     uint32_t *palette;
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     int x;
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-    palette = s1->last_palette;
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+    palette = vga->last_palette;
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        PUT_PIXEL2(d, 0, palette[s[0]]);
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-        PUT_PIXEL2(d, 1, palette[s[1]]);
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-        PUT_PIXEL2(d, 2, palette[s[2]]);
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-        PUT_PIXEL2(d, 3, palette[s[3]]);
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+        PUT_PIXEL2(d, 0, palette[vga_read_byte(vga, addr + 0)]);
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+        PUT_PIXEL2(d, 1, palette[vga_read_byte(vga, addr + 1)]);
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+        PUT_PIXEL2(d, 2, palette[vga_read_byte(vga, addr + 2)]);
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+        PUT_PIXEL2(d, 3, palette[vga_read_byte(vga, addr + 3)]);
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         d += 32;
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-        s += 4;
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+        addr += 4;
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     }
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 }
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@@ -256,63 +282,63 @@ static void vga_draw_line8d2(VGACommonState *s1, uint8_t *d,
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  *
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  * XXX: add plane_mask support (never used in standard VGA modes)
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  */
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-static void vga_draw_line8(VGACommonState *s1, uint8_t *d,
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-                           const uint8_t *s, int width)
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+static void vga_draw_line8(VGACommonState *vga, uint8_t *d,
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+                           uint32_t addr, int width)
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 {
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     uint32_t *palette;
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     int x;
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-    palette = s1->last_palette;
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+    palette = vga->last_palette;
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     width >>= 3;
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     for(x = 0; x < width; x++) {
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-        ((uint32_t *)d)[0] = palette[s[0]];
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-        ((uint32_t *)d)[1] = palette[s[1]];
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-        ((uint32_t *)d)[2] = palette[s[2]];
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-        ((uint32_t *)d)[3] = palette[s[3]];
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-        ((uint32_t *)d)[4] = palette[s[4]];
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-        ((uint32_t *)d)[5] = palette[s[5]];
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-        ((uint32_t *)d)[6] = palette[s[6]];
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-        ((uint32_t *)d)[7] = palette[s[7]];
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+        ((uint32_t *)d)[0] = palette[vga_read_byte(vga, addr + 0)];
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+        ((uint32_t *)d)[1] = palette[vga_read_byte(vga, addr + 1)];
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+        ((uint32_t *)d)[2] = palette[vga_read_byte(vga, addr + 2)];
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+        ((uint32_t *)d)[3] = palette[vga_read_byte(vga, addr + 3)];
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+        ((uint32_t *)d)[4] = palette[vga_read_byte(vga, addr + 4)];
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+        ((uint32_t *)d)[5] = palette[vga_read_byte(vga, addr + 5)];
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+        ((uint32_t *)d)[6] = palette[vga_read_byte(vga, addr + 6)];
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+        ((uint32_t *)d)[7] = palette[vga_read_byte(vga, addr + 7)];
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         d += 32;
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-        s += 8;
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+        addr += 8;
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     }
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 }
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 /*
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  * 15 bit color
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  */
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-static void vga_draw_line15_le(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line15_le(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t v, r, g, b;
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     w = width;
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     do {
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-        v = lduw_le_p((void *)s);
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+        v = vga_read_word_le(vga, addr);
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         r = (v >> 7) & 0xf8;
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         g = (v >> 2) & 0xf8;
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         b = (v << 3) & 0xf8;
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 2;
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+        addr += 2;
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         d += 4;
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     } while (--w != 0);
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 }
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-static void vga_draw_line15_be(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line15_be(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t v, r, g, b;
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     w = width;
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     do {
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-        v = lduw_be_p((void *)s);
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+        v = vga_read_word_be(vga, addr);
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         r = (v >> 7) & 0xf8;
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         g = (v >> 2) & 0xf8;
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         b = (v << 3) & 0xf8;
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 2;
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+        addr += 2;
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         d += 4;
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     } while (--w != 0);
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 }
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@@ -320,38 +346,38 @@ static void vga_draw_line15_be(VGACommonState *s1, uint8_t *d,
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 /*
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  * 16 bit color
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  */
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-static void vga_draw_line16_le(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line16_le(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t v, r, g, b;
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     w = width;
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     do {
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-        v = lduw_le_p((void *)s);
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+        v = vga_read_word_le(vga, addr);
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         r = (v >> 8) & 0xf8;
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         g = (v >> 3) & 0xfc;
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         b = (v << 3) & 0xf8;
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 2;
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+        addr += 2;
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         d += 4;
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     } while (--w != 0);
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 }
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-static void vga_draw_line16_be(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line16_be(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t v, r, g, b;
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     w = width;
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     do {
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-        v = lduw_be_p((void *)s);
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+        v = vga_read_word_be(vga, addr);
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         r = (v >> 8) & 0xf8;
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         g = (v >> 3) & 0xfc;
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         b = (v << 3) & 0xf8;
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 2;
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+        addr += 2;
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         d += 4;
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     } while (--w != 0);
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 }
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@@ -359,36 +385,36 @@ static void vga_draw_line16_be(VGACommonState *s1, uint8_t *d,
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 /*
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  * 24 bit color
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  */
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-static void vga_draw_line24_le(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line24_le(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t r, g, b;
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     w = width;
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     do {
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-        b = s[0];
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-        g = s[1];
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-        r = s[2];
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+        b = vga_read_byte(vga, addr + 0);
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+        g = vga_read_byte(vga, addr + 1);
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+        r = vga_read_byte(vga, addr + 2);
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 3;
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+        addr += 3;
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         d += 4;
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     } while (--w != 0);
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 }
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-static void vga_draw_line24_be(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line24_be(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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     int w;
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     uint32_t r, g, b;
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     w = width;
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     do {
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-        r = s[0];
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-        g = s[1];
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-        b = s[2];
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+        r = vga_read_byte(vga, addr + 0);
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+        g = vga_read_byte(vga, addr + 1);
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+        b = vga_read_byte(vga, addr + 2);
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 3;
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+        addr += 3;
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         d += 4;
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     } while (--w != 0);
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 }
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@@ -396,44 +422,36 @@ static void vga_draw_line24_be(VGACommonState *s1, uint8_t *d,
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 /*
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  * 32 bit color
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  */
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-static void vga_draw_line32_le(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line32_le(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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-#ifndef HOST_WORDS_BIGENDIAN
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-    memcpy(d, s, width * 4);
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-#else
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     int w;
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     uint32_t r, g, b;
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     w = width;
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     do {
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-        b = s[0];
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-        g = s[1];
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-        r = s[2];
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+        b = vga_read_byte(vga, addr + 0);
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+        g = vga_read_byte(vga, addr + 1);
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+        r = vga_read_byte(vga, addr + 2);
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 4;
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+        addr += 4;
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         d += 4;
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     } while (--w != 0);
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-#endif
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 }
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-static void vga_draw_line32_be(VGACommonState *s1, uint8_t *d,
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-                               const uint8_t *s, int width)
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+static void vga_draw_line32_be(VGACommonState *vga, uint8_t *d,
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+                               uint32_t addr, int width)
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 {
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-#ifdef HOST_WORDS_BIGENDIAN
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-    memcpy(d, s, width * 4);
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-#else
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     int w;
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     uint32_t r, g, b;
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     w = width;
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     do {
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-        r = s[1];
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-        g = s[2];
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-        b = s[3];
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+        r = vga_read_byte(vga, addr + 1);
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+        g = vga_read_byte(vga, addr + 2);
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+        b = vga_read_byte(vga, addr + 3);
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         ((uint32_t *)d)[0] = rgb_to_pixel32(r, g, b);
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-        s += 4;
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+        addr += 4;
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         d += 4;
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     } while (--w != 0);
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-#endif
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 }
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diff --git a/hw/display/vga.c b/hw/display/vga.c
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index 4618823..5b0b864 100644
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--- a/hw/display/vga.c
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+++ b/hw/display/vga.c
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@@ -1045,7 +1045,7 @@ void vga_mem_writeb(VGACommonState *s, hwaddr addr, uint32_t val)
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 }
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 typedef void vga_draw_line_func(VGACommonState *s1, uint8_t *d,
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-                                const uint8_t *s, int width);
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+                                uint32_t srcaddr, int width);
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 #include "vga-helpers.h"
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@@ -1682,7 +1682,7 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
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             if (page1 > page_max)
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                 page_max = page1;
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             if (!(is_buffer_shared(surface))) {
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-                vga_draw_line(s, d, s->vram_ptr + addr, width);
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+                vga_draw_line(s, d, addr, width);
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                 if (s->cursor_draw_line)
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                     s->cursor_draw_line(s, d, y);
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             }
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@@ -2162,6 +2162,7 @@ void vga_common_init(VGACommonState *s)
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     if (!s->vbe_size) {
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         s->vbe_size = s->vram_size;
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     }
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+    s->vbe_size_mask = s->vbe_size - 1;
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     s->is_vbe_vmstate = 1;
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     memory_region_init_ram(&s->vram, "vga.vram", s->vram_size);
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diff --git a/hw/display/vga_int.h b/hw/display/vga_int.h
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index 7c758ac..94add2f 100644
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--- a/hw/display/vga_int.h
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+++ b/hw/display/vga_int.h
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@@ -94,6 +94,7 @@ typedef struct VGACommonState {
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     uint32_t vram_size;
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     uint32_t vram_size_mb; /* property */
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     uint32_t vbe_size;
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+    uint32_t vbe_size_mask;
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     uint32_t latch;
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     MemoryRegion *chain4_alias;
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     uint8_t sr_index;
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-- 
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1.8.3.1
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