diff mbox series

[v4,5/6] hppa: Add emulation of Artist graphics

Message ID 20191103205607.6590-6-svens@stackframe.org
State New
Headers show
Series [v4,1/6] hw/hppa/dino.c: Improve emulation of Dino PCI chip | expand

Commit Message

Sven Schnelle Nov. 3, 2019, 8:56 p.m. UTC
This adds emulation of Artist graphics good enough
to get a Text console on both Linux and HP-UX. The
X11 server from HP-UX also works.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
---
 hw/display/Kconfig       |    4 +
 hw/display/Makefile.objs |    1 +
 hw/display/artist.c      | 1449 ++++++++++++++++++++++++++++++++++++++
 hw/display/trace-events  |    9 +
 hw/hppa/Kconfig          |    1 +
 hw/hppa/hppa_hardware.h  |    1 +
 hw/hppa/machine.c        |    9 +
 7 files changed, 1474 insertions(+)
 create mode 100644 hw/display/artist.c

Comments

Richard Henderson Dec. 19, 2019, 12:28 a.m. UTC | #1
On 11/3/19 10:56 AM, Sven Schnelle wrote:
> This adds emulation of Artist graphics good enough
> to get a Text console on both Linux and HP-UX. The
> X11 server from HP-UX also works.
> 
> Signed-off-by: Sven Schnelle <svens@stackframe.org>
> ---
>  hw/display/Kconfig       |    4 +
>  hw/display/Makefile.objs |    1 +
>  hw/display/artist.c      | 1449 ++++++++++++++++++++++++++++++++++++++
>  hw/display/trace-events  |    9 +
>  hw/hppa/Kconfig          |    1 +
>  hw/hppa/hppa_hardware.h  |    1 +
>  hw/hppa/machine.c        |    9 +
>  7 files changed, 1474 insertions(+)
>  create mode 100644 hw/display/artist.c

Seems to have some problems rebased upon master:


> Thread 6 "qemu-system-hpp" received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fffee3b6700 (LWP 11752)]
> 0x00005555558bba54 in artist_rop8 (s=s@entry=0x555556105400, 
>     dst=dst@entry=0x7fffed740000 "", val=0 '\000')
>     at /home/rth/qemu/qemu/hw/display/artist.c:288
> 288	        *dst |= val & plane_mask;
> (gdb) where
> #0  0x00005555558bba54 in artist_rop8
>     (s=s@entry=0x555556105400, dst=dst@entry=0x7fffed740000 "", val=0 '\000')
>     at /home/rth/qemu/qemu/hw/display/artist.c:288
> #1  0x00005555558bc145 in vram_bit_write
>     (s=s@entry=0x555556105400, posx=<optimized out>, posy=<optimized out>, incr_x=incr_x@entry=false, size=size@entry=4, data=<optimized out>, data@entry=0)
>     at /home/rth/qemu/qemu/hw/display/artist.c:430
> #2  0x00005555558bd33b in artist_reg_write
>     (opaque=0x555556105400, addr=1050144, val=0, size=4)
>     at /home/rth/qemu/qemu/hw/display/artist.c:862
> #3  0x00005555557b271b in memory_region_write_accessor
>     (mr=mr@entry=0x5555561058f0, addr=addr@entry=1050144, value=value@entry=0x7fffee3b4f08, size=size@entry=4, shift=shift@entry=0, mask=mask@entry=4294967295, attrs=...) at /home/rth/qemu/qemu/memory.c:483
> #4  0x00005555557b03d3 in access_with_adjusted_size
>     (addr=addr@entry=1050144, value=value@entry=0x7fffee3b4f08, size=size@entry=4, access_size_min=<optimized out>, access_size_max=<optimized out>, access_fn=access_fn@entry=
>     0x5555557b25f0 <memory_region_write_accessor>, mr=0x5555561058f0, attrs=...) at /home/rth/qemu/qemu/memory.c:539
> #5  0x00005555557b4b34 in memory_region_dispatch_write
>     (mr=mr@entry=0x5555561058f0, addr=addr@entry=1050144, data=<optimized out>, data@entry=0, op=op@entry=MO_BEUL, attrs=...)
>     at /home/rth/qemu/qemu/memory.c:1475
> #6  0x00005555557c18ed in io_writex
>     (env=env@entry=0x5555563a6b60, mmu_idx=mmu_idx@entry=4, val=val@entry=0, addr=addr@entry=4161799712, retaddr=140736415114886, op=MO_BEUL, iotlbentry=<optimized out>, iotlbentry=<optimized out>)
>     at /home/rth/qemu/qemu/accel/tcg/cputlb.c:977
> #7  0x00005555557c77bc in store_helper
>     (op=MO_BEUL, retaddr=140736415114886, oi=<optimized out>, val=0, addr=4161799712, env=0x5555563a6b60) at /home/rth/qemu/qemu/accel/tcg/cputlb.c:1716
> #8  0x00005555557c77bc in helper_be_stl_mmu
>     (env=0x5555563a6b60, addr=4161799712, val=0, oi=<optimized out>, retaddr=140736415114886) at /home/rth/qemu/qemu/accel/tcg/cputlb.c:1842
> #9  0x00007fffc007a686 in code_gen_buffer ()
Helge Deller Dec. 20, 2019, 7:26 a.m. UTC | #2
On 19.12.19 01:28, Richard Henderson wrote:
> On 11/3/19 10:56 AM, Sven Schnelle wrote:
>> This adds emulation of Artist graphics good enough
>> to get a Text console on both Linux and HP-UX. The
>> X11 server from HP-UX also works.
>>
>> Signed-off-by: Sven Schnelle <svens@stackframe.org>
>> ---
>>  hw/display/Kconfig       |    4 +
>>  hw/display/Makefile.objs |    1 +
>>  hw/display/artist.c      | 1449 ++++++++++++++++++++++++++++++++++++++
>>  hw/display/trace-events  |    9 +
>>  hw/hppa/Kconfig          |    1 +
>>  hw/hppa/hppa_hardware.h  |    1 +
>>  hw/hppa/machine.c        |    9 +
>>  7 files changed, 1474 insertions(+)
>>  create mode 100644 hw/display/artist.c
>
> Seems to have some problems rebased upon master:
>
>
>> Thread 6 "qemu-system-hpp" received signal SIGSEGV, Segmentation fault.
>> [Switching to Thread 0x7fffee3b6700 (LWP 11752)]
>> 0x00005555558bba54 in artist_rop8 (s=s@entry=0x555556105400,
>>     dst=dst@entry=0x7fffed740000 "", val=0 '\000')
>>     at /home/rth/qemu/qemu/hw/display/artist.c:288
>> 288	        *dst |= val & plane_mask;
>> (gdb) where
>> #0  0x00005555558bba54 in artist_rop8
>>     (s=s@entry=0x555556105400, dst=dst@entry=0x7fffed740000 "", val=0 '\000')
>>     at /home/rth/qemu/qemu/hw/display/artist.c:288
>> #1  0x00005555558bc145 in vram_bit_write
>>     (s=s@entry=0x555556105400, posx=<optimized out>, posy=<optimized out>, incr_x=incr_x@entry=false, size=size@entry=4, data=<optimized out>, data@entry=0)
>>     at /home/rth/qemu/qemu/hw/display/artist.c:430
>> #2  0x00005555558bd33b in artist_reg_write
>>     (opaque=0x555556105400, addr=1050144, val=0, size=4)
>>     at /home/rth/qemu/qemu/hw/display/artist.c:862
>> #3  0x00005555557b271b in memory_region_write_accessor
>>     (mr=mr@entry=0x5555561058f0, addr=addr@entry=1050144, value=value@entry=0x7fffee3b4f08, size=size@entry=4, shift=shift@entry=0, mask=mask@entry=4294967295, attrs=...) at /home/rth/qemu/qemu/memory.c:483
>> #4  0x00005555557b03d3 in access_with_adjusted_size
>>     (addr=addr@entry=1050144, value=value@entry=0x7fffee3b4f08, size=size@entry=4, access_size_min=<optimized out>, access_size_max=<optimized out>, access_fn=access_fn@entry=
>>     0x5555557b25f0 <memory_region_write_accessor>, mr=0x5555561058f0, attrs=...) at /home/rth/qemu/qemu/memory.c:539
>> #5  0x00005555557b4b34 in memory_region_dispatch_write
>>     (mr=mr@entry=0x5555561058f0, addr=addr@entry=1050144, data=<optimized out>, data@entry=0, op=op@entry=MO_BEUL, attrs=...)
>>     at /home/rth/qemu/qemu/memory.c:1475
>> #6  0x00005555557c18ed in io_writex
>>     (env=env@entry=0x5555563a6b60, mmu_idx=mmu_idx@entry=4, val=val@entry=0, addr=addr@entry=4161799712, retaddr=140736415114886, op=MO_BEUL, iotlbentry=<optimized out>, iotlbentry=<optimized out>)
>>     at /home/rth/qemu/qemu/accel/tcg/cputlb.c:977
>> #7  0x00005555557c77bc in store_helper
>>     (op=MO_BEUL, retaddr=140736415114886, oi=<optimized out>, val=0, addr=4161799712, env=0x5555563a6b60) at /home/rth/qemu/qemu/accel/tcg/cputlb.c:1716
>> #8  0x00005555557c77bc in helper_be_stl_mmu
>>     (env=0x5555563a6b60, addr=4161799712, val=0, oi=<optimized out>, retaddr=140736415114886) at /home/rth/qemu/qemu/accel/tcg/cputlb.c:1842
>> #9  0x00007fffc007a686 in code_gen_buffer ()


Richard, the attached patch (for seabios-hppa) fixes it for me.
Can you test as well?
It fixes the sti text column to go out-of-range and thus outside the framebuffer memory.

Helge
Helge Deller Dec. 20, 2019, 4:36 p.m. UTC | #3
On 20.12.19 08:26, Helge Deller wrote:
> On 19.12.19 01:28, Richard Henderson wrote:
>> On 11/3/19 10:56 AM, Sven Schnelle wrote:
>>> This adds emulation of Artist graphics good enough
>>> to get a Text console on both Linux and HP-UX. The
>>> X11 server from HP-UX also works.
>>>
>>> Signed-off-by: Sven Schnelle <svens@stackframe.org>
>>> ---
>>>  hw/display/Kconfig       |    4 +
>>>  hw/display/Makefile.objs |    1 +
>>>  hw/display/artist.c      | 1449 ++++++++++++++++++++++++++++++++++++++
>>>  hw/display/trace-events  |    9 +
>>>  hw/hppa/Kconfig          |    1 +
>>>  hw/hppa/hppa_hardware.h  |    1 +
>>>  hw/hppa/machine.c        |    9 +
>>>  7 files changed, 1474 insertions(+)
>>>  create mode 100644 hw/display/artist.c
>>
>> Seems to have some problems rebased upon master:
>>
>> ...
>
> Richard, the attached patch (for seabios-hppa) fixes it for me.
> Can you test as well?
> It fixes the sti text column to go out-of-range and thus outside the framebuffer memory.

The attached patch is even better.
It always wraps to the next line (or scrolls the screen if necessary) if
the end of the line has been reached.

Helge
diff --git a/src/parisc/sti.c b/src/parisc/sti.c
index 7935770..61e7002 100644
--- a/src/parisc/sti.c
+++ b/src/parisc/sti.c
@@ -168,5 +168,10 @@ void sti_putc(const char c)
         }
         return;
     }
+
+    /* wrap to next line or scroll screen if EOL reached */
+    if (col >= ((sti_glob_cfg.onscreen_x / font->width) - 1))
+	sti_putc('\n');
+
     sti_putchar(rom, row, col++, c);
 }
Sven Schnelle Dec. 20, 2019, 5:03 p.m. UTC | #4
Hi,

On Fri, Dec 20, 2019 at 05:36:36PM +0100, Helge Deller wrote:
> On 20.12.19 08:26, Helge Deller wrote:
> > On 19.12.19 01:28, Richard Henderson wrote:
> >> On 11/3/19 10:56 AM, Sven Schnelle wrote:
> >>> This adds emulation of Artist graphics good enough
> >>> to get a Text console on both Linux and HP-UX. The
> >>> X11 server from HP-UX also works.
> >>>
> >>> Signed-off-by: Sven Schnelle <svens@stackframe.org>
> >>> ---
> >>>  hw/display/Kconfig       |    4 +
> >>>  hw/display/Makefile.objs |    1 +
> >>>  hw/display/artist.c      | 1449 ++++++++++++++++++++++++++++++++++++++
> >>>  hw/display/trace-events  |    9 +
> >>>  hw/hppa/Kconfig          |    1 +
> >>>  hw/hppa/hppa_hardware.h  |    1 +
> >>>  hw/hppa/machine.c        |    9 +
> >>>  7 files changed, 1474 insertions(+)
> >>>  create mode 100644 hw/display/artist.c
> >>
> >> Seems to have some problems rebased upon master:
> >>
> >> ...
> >
> > Richard, the attached patch (for seabios-hppa) fixes it for me.
> > Can you test as well?
> > It fixes the sti text column to go out-of-range and thus outside the framebuffer memory.
> 
> The attached patch is even better.
> It always wraps to the next line (or scrolls the screen if necessary) if
> the end of the line has been reached.
> 
> Helge

> diff --git a/src/parisc/sti.c b/src/parisc/sti.c
> index 7935770..61e7002 100644
> --- a/src/parisc/sti.c
> +++ b/src/parisc/sti.c
> @@ -168,5 +168,10 @@ void sti_putc(const char c)
>          }
>          return;
>      }
> +
> +    /* wrap to next line or scroll screen if EOL reached */
> +    if (col >= ((sti_glob_cfg.onscreen_x / font->width) - 1))
> +	sti_putc('\n');
> +
>      sti_putchar(rom, row, col++, c);
>  }

Besides this, the root cause is the out-of-bounds check in vram_bit_write():
This fixes the crash for me. I'll resend an updated version later. Thanks for
helping debugging this issue!

diff --git a/hw/display/artist.c b/hw/display/artist.c
index 1d6c7d5d76..13c770e795 100644
--- a/hw/display/artist.c
+++ b/hw/display/artist.c
@@ -360,7 +360,7 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
         return;
     }

-    if (posy * width + posx > buf->size) {
+    if (posy * width + posx >= buf->size) {
         qemu_log("write outside bounds: wants %dx%d, max size %dx%d\n",
                 posx, posy, width, height);
         return;

Regards
Sven
diff mbox series

Patch

diff --git a/hw/display/Kconfig b/hw/display/Kconfig
index c500d1fc6d..15d59e10dc 100644
--- a/hw/display/Kconfig
+++ b/hw/display/Kconfig
@@ -91,6 +91,10 @@  config TCX
 config CG3
     bool
 
+config ARTIST
+    bool
+    select FRAMEBUFFER
+
 config VGA
     bool
 
diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
index f2182e3bef..5f03dfdcc4 100644
--- a/hw/display/Makefile.objs
+++ b/hw/display/Makefile.objs
@@ -40,6 +40,7 @@  common-obj-$(CONFIG_SM501) += sm501.o
 common-obj-$(CONFIG_TCX) += tcx.o
 common-obj-$(CONFIG_CG3) += cg3.o
 common-obj-$(CONFIG_NEXTCUBE) += next-fb.o
+common-obj-$(CONFIG_ARTIST) += artist.o
 
 obj-$(CONFIG_VGA) += vga.o
 
diff --git a/hw/display/artist.c b/hw/display/artist.c
new file mode 100644
index 0000000000..1d6c7d5d76
--- /dev/null
+++ b/hw/display/artist.c
@@ -0,0 +1,1449 @@ 
+/*
+ * QEMU HP Artist Emulation
+ *
+ * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "qemu/typedefs.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qemu/units.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "hw/loader.h"
+#include "hw/qdev-core.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+#include "ui/console.h"
+#include "trace.h"
+#include "hw/display/framebuffer.h"
+
+#define TYPE_ARTIST "artist"
+#define ARTIST(obj) OBJECT_CHECK(ARTISTState, (obj), TYPE_ARTIST)
+
+#ifdef HOST_WORDS_BIGENDIAN
+#define ROP8OFF(_i) (3 - (_i))
+#else
+#define ROP8OFF
+#endif
+
+struct vram_buffer {
+    MemoryRegion mr;
+    uint8_t *data;
+    int size;
+    int width;
+    int height;
+};
+
+typedef struct ARTISTState {
+    SysBusDevice parent_obj;
+
+    QemuConsole *con;
+    MemoryRegion vram_mem;
+    MemoryRegion mem_as_root;
+    MemoryRegion reg;
+    MemoryRegionSection fbsection;
+
+    void *vram_int_mr;
+    AddressSpace as;
+
+    struct vram_buffer vram_buffer[16];
+
+    uint16_t width;
+    uint16_t height;
+    uint16_t depth;
+
+    uint32_t fg_color;
+    uint32_t bg_color;
+
+    uint32_t vram_char_y;
+    uint32_t vram_bitmask;
+
+    uint32_t vram_start;
+    uint32_t vram_pos;
+
+    uint32_t vram_size;
+
+    uint32_t blockmove_source;
+    uint32_t blockmove_dest;
+    uint32_t blockmove_size;
+
+    uint32_t line_size;
+    uint32_t line_end;
+    uint32_t line_xy;
+    uint32_t line_pattern_start;
+    uint32_t line_pattern_skip;
+
+    uint32_t cursor_pos;
+
+    uint32_t cursor_height;
+    uint32_t cursor_width;
+
+    uint32_t plane_mask;
+
+    uint32_t reg_100080;
+    uint32_t reg_300200;
+    uint32_t reg_300208;
+    uint32_t reg_300218;
+
+    uint32_t cmap_bm_access;
+    uint32_t dst_bm_access;
+    uint32_t src_bm_access;
+    uint32_t control_plane;
+    uint32_t transfer_data;
+    uint32_t image_bitmap_op;
+
+    uint32_t font_write1;
+    uint32_t font_write2;
+    uint32_t font_write_pos_y;
+
+    int draw_line_pattern;
+} ARTISTState;
+
+typedef enum {
+    ARTIST_BUFFER_AP = 1,
+    ARTIST_BUFFER_OVERLAY = 2,
+    ARTIST_BUFFER_CURSOR1 = 6,
+    ARTIST_BUFFER_CURSOR2 = 7,
+    ARTIST_BUFFER_ATTRIBUTE = 13,
+    ARTIST_BUFFER_CMAP = 15,
+} artist_buffer_t;
+
+typedef enum {
+    VRAM_IDX = 0x1004a0,
+    VRAM_BITMASK = 0x1005a0,
+    VRAM_WRITE_INCR_X = 0x100600,
+    VRAM_WRITE_INCR_X2 = 0x100604,
+    VRAM_WRITE_INCR_Y = 0x100620,
+    VRAM_START = 0x100800,
+    BLOCK_MOVE_SIZE = 0x100804,
+    BLOCK_MOVE_SOURCE = 0x100808,
+    TRANSFER_DATA = 0x100820,
+    FONT_WRITE_INCR_Y = 0x1008a0,
+    VRAM_START_TRIGGER = 0x100a00,
+    VRAM_SIZE_TRIGGER = 0x100a04,
+    FONT_WRITE_START = 0x100aa0,
+    BLOCK_MOVE_DEST_TRIGGER = 0x100b00,
+    BLOCK_MOVE_SIZE_TRIGGER = 0x100b04,
+    LINE_XY = 0x100ccc,
+    PATTERN_LINE_START = 0x100ecc,
+    LINE_SIZE = 0x100e04,
+    LINE_END = 0x100e44,
+    CMAP_BM_ACCESS = 0x118000,
+    DST_BM_ACCESS = 0x118004,
+    SRC_BM_ACCESS = 0x118008,
+    CONTROL_PLANE = 0x11800c,
+    FG_COLOR = 0x118010,
+    BG_COLOR = 0x118014,
+    PLANE_MASK = 0x118018,
+    IMAGE_BITMAP_OP = 0x11801c,
+    CURSOR_POS = 0x300100,
+    CURSOR_CTRL = 0x300104,
+} artist_reg_t;
+
+typedef enum {
+    ARTIST_ROP_CLEAR = 0,
+    ARTIST_ROP_COPY = 3,
+    ARTIST_ROP_XOR = 6,
+    ARTIST_ROP_NOT_DST = 10,
+    ARTIST_ROP_SET = 15,
+} artist_rop_t;
+
+#define REG_NAME(_x) case _x: return " "#_x;
+static const char *artist_reg_name(uint64_t addr)
+{
+    switch ((artist_reg_t)addr) {
+    REG_NAME(VRAM_IDX);
+    REG_NAME(VRAM_BITMASK);
+    REG_NAME(VRAM_WRITE_INCR_X);
+    REG_NAME(VRAM_WRITE_INCR_X2);
+    REG_NAME(VRAM_WRITE_INCR_Y);
+    REG_NAME(VRAM_START);
+    REG_NAME(BLOCK_MOVE_SIZE);
+    REG_NAME(BLOCK_MOVE_SOURCE);
+    REG_NAME(FG_COLOR);
+    REG_NAME(BG_COLOR);
+    REG_NAME(PLANE_MASK);
+    REG_NAME(VRAM_START_TRIGGER);
+    REG_NAME(VRAM_SIZE_TRIGGER);
+    REG_NAME(BLOCK_MOVE_DEST_TRIGGER);
+    REG_NAME(BLOCK_MOVE_SIZE_TRIGGER);
+    REG_NAME(TRANSFER_DATA);
+    REG_NAME(CONTROL_PLANE);
+    REG_NAME(IMAGE_BITMAP_OP);
+    REG_NAME(CMAP_BM_ACCESS);
+    REG_NAME(DST_BM_ACCESS);
+    REG_NAME(SRC_BM_ACCESS);
+    REG_NAME(CURSOR_POS);
+    REG_NAME(CURSOR_CTRL);
+    REG_NAME(LINE_XY);
+    REG_NAME(PATTERN_LINE_START);
+    REG_NAME(LINE_SIZE);
+    REG_NAME(LINE_END);
+    REG_NAME(FONT_WRITE_INCR_Y);
+    REG_NAME(FONT_WRITE_START);
+    }
+    return "";
+}
+
+static int16_t artist_get_x(uint32_t reg)
+{
+    return reg >> 16;
+}
+
+static int16_t artist_get_y(uint32_t reg)
+{
+    return reg & 0xffff;
+}
+
+static void artist_invalidate_lines(struct vram_buffer *buf,
+                                 int starty, int height)
+{
+    int start = starty * buf->width;
+    int size = height * buf->width;
+
+    if (start + size <= buf->size) {
+        memory_region_set_dirty(&buf->mr, start, size);
+    }
+}
+
+static int vram_write_pix_per_transfer(ARTISTState *s)
+{
+    if (s->cmap_bm_access) {
+        return 1 << ((s->cmap_bm_access >> 27) & 0x0f);
+    } else {
+        return 1 << ((s->dst_bm_access >> 27) & 0x0f);
+    }
+}
+
+static int vram_pixel_length(ARTISTState *s)
+{
+    if (s->cmap_bm_access) {
+        return (s->cmap_bm_access >> 24) & 0x07;
+    } else {
+        return (s->dst_bm_access >> 24) & 0x07;
+    }
+}
+
+static int vram_write_bufidx(ARTISTState *s)
+{
+    if (s->cmap_bm_access) {
+        return (s->cmap_bm_access >> 12) & 0x0f;
+    } else {
+        return (s->dst_bm_access >> 12) & 0x0f;
+    }
+}
+
+static int vram_read_bufidx(ARTISTState *s)
+{
+    if (s->cmap_bm_access) {
+        return (s->cmap_bm_access >> 12) & 0x0f;
+    } else {
+        return (s->src_bm_access >> 12) & 0x0f;
+    }
+}
+
+static struct vram_buffer *vram_read_buffer(ARTISTState *s)
+{
+    return &s->vram_buffer[vram_read_bufidx(s)];
+}
+
+static struct vram_buffer *vram_write_buffer(ARTISTState *s)
+{
+    return &s->vram_buffer[vram_write_bufidx(s)];
+}
+
+static uint8_t artist_get_color(ARTISTState *s)
+{
+    if (s->image_bitmap_op & 2) {
+        return s->fg_color;
+    } else {
+        return s->bg_color;
+    }
+}
+
+static artist_rop_t artist_get_op(ARTISTState *s)
+{
+    return (s->image_bitmap_op >> 8) & 0xf;
+}
+
+static void artist_rop8(ARTISTState *s, uint8_t *dst, uint8_t val)
+{
+
+    const artist_rop_t op = artist_get_op(s);
+    uint8_t plane_mask = s->plane_mask & 0xff;
+
+    switch (op) {
+    case ARTIST_ROP_CLEAR:
+        *dst &= ~plane_mask;
+        break;
+
+    case ARTIST_ROP_COPY:
+        *dst &= ~plane_mask;
+        *dst |= val & plane_mask;
+        break;
+
+    case ARTIST_ROP_XOR:
+        *dst ^= val & plane_mask;
+        break;
+
+    case ARTIST_ROP_NOT_DST:
+        *dst ^= plane_mask;
+        break;
+
+    case ARTIST_ROP_SET:
+        *dst |= plane_mask;
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: unsupported rop %d\n", __func__, op);
+        break;
+    }
+}
+
+static void artist_get_cursor_pos(ARTISTState *s, int *x, int *y)
+{
+    /*
+     * Don't know whether these magic offset values are configurable via
+     * some register. They are the same for all resolutions, so don't
+     * bother about it.
+     */
+
+    *y = 0x47a - artist_get_y(s->cursor_pos);
+    *x = ((artist_get_x(s->cursor_pos) - 338) / 2);
+
+    if (*x > s->width) {
+        *x = 0;
+    }
+
+    if (*y > s->height) {
+        *y = 0;
+    }
+}
+
+static void artist_invalidate_cursor(ARTISTState *s)
+{
+    int x, y;
+    artist_get_cursor_pos(s, &x, &y);
+    artist_invalidate_lines(&s->vram_buffer[ARTIST_BUFFER_AP],
+                            y, s->cursor_height);
+}
+
+static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
+                           int size, uint32_t data)
+{
+    struct vram_buffer *buf;
+    uint32_t vram_bitmask = s->vram_bitmask;
+    int mask, i, pix_count, pix_length, offset, height, width;
+    uint8_t *data8, *p;
+
+    pix_count = vram_write_pix_per_transfer(s);
+    pix_length = vram_pixel_length(s);
+
+    buf = vram_write_buffer(s);
+    height = buf->height;
+    width = buf->width;
+
+    if (s->cmap_bm_access) {
+        offset = s->vram_pos;
+    } else {
+        offset = posy * width + posx;
+    }
+
+    if (!buf->size) {
+        qemu_log("write to non-existent buffer\n");
+        return;
+    }
+
+    if (posy * width + posx > buf->size) {
+        qemu_log("write outside bounds: wants %dx%d, max size %dx%d\n",
+                posx, posy, width, height);
+        return;
+    }
+
+    p = buf->data;
+
+    if (pix_count > size * 8) {
+        pix_count = size * 8;
+    }
+
+    switch (pix_length) {
+    case 0:
+        if (s->image_bitmap_op & 0x20000000) {
+                data &= vram_bitmask;
+        }
+
+        for (i = 0; i < pix_count; i++) {
+            artist_rop8(s, p + offset + pix_count - 1 - i,
+                (data & 1) ? (s->plane_mask >> 24) : 0);
+            data >>= 1;
+        }
+        memory_region_set_dirty(&buf->mr, offset, pix_count);
+        break;
+
+    case 3:
+        if (s->cmap_bm_access) {
+            *(uint32_t *)(p + offset) = data;
+            break;
+        }
+        data8 = (uint8_t *)&data;
+
+        for (i = 3; i >= 0; i--) {
+            if (!(s->image_bitmap_op & 0x20000000) ||
+                    s->vram_bitmask & (1 << (28 + i))) {
+                artist_rop8(s, p + offset + 3 - i, data8[ROP8OFF(i)]);
+            }
+        }
+        memory_region_set_dirty(&buf->mr, offset, 3);
+        break;
+
+    case 6:
+        switch (size) {
+        default:
+        case 4:
+            vram_bitmask = s->vram_bitmask;
+            break;
+
+        case 2:
+            vram_bitmask = s->vram_bitmask >> 16;
+            break;
+
+        case 1:
+            vram_bitmask = s->vram_bitmask >> 24;
+            break;
+        }
+
+        for (i = 0; i < pix_count; i++) {
+            mask = 1 << (pix_count - 1 - i);
+
+            if (!(s->image_bitmap_op & 0x20000000) ||
+                 (vram_bitmask & mask)) {
+                if (data & mask) {
+                    artist_rop8(s, p + offset + i, s->fg_color);
+                } else {
+                   if (!(s->image_bitmap_op & 0x10000002)) {
+                        artist_rop8(s, p + offset + i, s->bg_color);
+                    }
+                }
+            }
+        }
+        memory_region_set_dirty(&buf->mr, offset, pix_count);
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: unknown pixel length %d\n",
+            __func__, pix_length);
+        break;
+    }
+
+    if (incr_x) {
+        if (s->cmap_bm_access) {
+            s->vram_pos += 4;
+        } else {
+            s->vram_pos += pix_count << 2;
+        }
+    }
+
+    if (vram_write_bufidx(s) == ARTIST_BUFFER_CURSOR1 ||
+        vram_write_bufidx(s) == ARTIST_BUFFER_CURSOR2) {
+            artist_invalidate_cursor(s);
+    }
+}
+
+static void block_move(ARTISTState *s, int source_x, int source_y, int dest_x,
+                    int dest_y, int width, int height)
+{
+    struct vram_buffer *buf;
+    int line, endline, lineincr, startcolumn, endcolumn, columnincr, column;
+    uint32_t dst, src;
+
+    trace_artist_block_move(source_x, source_y, dest_x, dest_y, width, height);
+
+    if (s->control_plane != 0) {
+        /* We don't support CONTROL_PLANE accesses */
+        qemu_log_mask(LOG_UNIMP, "%s: CONTROL_PLANE: %08x\n", __func__,
+            s->control_plane);
+        return;
+    }
+
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+
+    if (dest_y > source_y) {
+        /* move down */
+        line = height - 1;
+        endline = -1;
+        lineincr = -1;
+    } else {
+        /* move up */
+        line = 0;
+        endline = height;
+        lineincr = 1;
+    }
+
+    if (dest_x > source_x) {
+        /* move right */
+        startcolumn = width - 1;
+        endcolumn = -1;
+        columnincr = -1;
+    } else {
+        /* move left */
+        startcolumn = 0;
+        endcolumn = width;
+        columnincr = 1;
+    }
+
+    for ( ; line != endline; line += lineincr) {
+        src = source_x + ((line + source_y) * buf->width);
+        dst = dest_x + ((line + dest_y) * buf->width);
+
+        for (column = startcolumn; column != endcolumn; column += columnincr) {
+            if (dst + column > buf->size || src + column > buf->size) {
+                continue;
+            }
+            artist_rop8(s, buf->data + dst + column, buf->data[src + column]);
+        }
+    }
+
+    artist_invalidate_lines(buf, dest_y, height);
+}
+
+static void fill_window(ARTISTState *s, int startx, int starty,
+                        int width, int height)
+{
+    uint32_t offset;
+    uint8_t color = artist_get_color(s);
+    struct vram_buffer *buf;
+    int x, y;
+
+    trace_artist_fill_window(startx, starty, width, height,
+        s->image_bitmap_op, s->control_plane);
+
+    if (s->control_plane != 0) {
+        /* We don't support CONTROL_PLANE accesses */
+        qemu_log_mask(LOG_UNIMP, "%s: CONTROL_PLANE: %08x\n", __func__,
+            s->control_plane);
+        return;
+    }
+
+    if (s->reg_100080 == 0x7d) {
+        /*
+         * Not sure what this register really does, but
+         * 0x7d seems to enable autoincremt of the Y axis
+         * by the current block move height.
+         */
+        height = artist_get_y(s->blockmove_size);
+        s->vram_start += height;
+    }
+
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+
+    for (y = starty; y < starty + height; y++) {
+        offset = y * s->width;
+
+        for (x = startx; x < startx + width; x++) {
+            artist_rop8(s, buf->data + offset + x, color);
+        }
+    }
+    artist_invalidate_lines(buf, starty, height);
+}
+
+static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2,
+        bool update_start, int skip_pix, int max_pix)
+{
+    struct vram_buffer *buf;
+    uint8_t color = artist_get_color(s);
+    int dx, dy, t, e, x, y, incy, diago, horiz;
+    bool c1;
+    uint8_t *p;
+
+
+    if (update_start) {
+        s->vram_start = (x2 << 16) | y2;
+    }
+
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+
+    c1 = false;
+    incy = 1;
+
+    if (x2 > x1) {
+        dx = x2 - x1;
+    } else {
+        dx = x1 - x2;
+    }
+    if (y2 > y1) {
+        dy = y2 - y1;
+    } else {
+        dy = y1 - y2;
+    }
+    if (dy > dx) {
+        t = y2;
+        y2 = x2;
+        x2 = t;
+
+        t = y1;
+        y1 = x1;
+        x1 = t;
+
+        t = dx;
+        dx = dy;
+        dy = t;
+
+        c1 = true;
+    }
+
+    if (x1 > x2) {
+        t = y2;
+        y2 = y1;
+        y1 = t;
+
+        t = x1;
+        x1 = x2;
+        x2 = t;
+    }
+
+    horiz = dy << 1;
+    diago = (dy - dx) << 1;
+    e = (dy << 1) - dx;
+
+    if (y1 <= y2) {
+        incy = 1;
+    } else {
+        incy = -1;
+    }
+    x = x1;
+    y = y1;
+
+    do {
+        if (c1) {
+            p = buf->data + x * s->width + y;
+       } else {
+            p = buf->data + y * s->width + x;
+       }
+
+        if (skip_pix > 0) {
+            skip_pix--;
+        } else {
+            artist_rop8(s, p, color);
+        }
+
+        if (e > 0) {
+            artist_invalidate_lines(buf, y, 1);
+            y  += incy;
+            e  += diago;
+        } else {
+            e += horiz;
+        }
+        x++;
+    } while (x <= x2 && (max_pix == -1 || --max_pix > 0));
+}
+
+static void draw_line_pattern_start(ARTISTState *s)
+{
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start);
+    int endx = artist_get_x(s->blockmove_size);
+    int endy = artist_get_y(s->blockmove_size);
+    int pstart = s->line_pattern_start >> 16;
+
+    trace_artist_draw_line(startx, starty, endx, endy);
+    draw_line(s, startx, starty, endx, endy, false, -1, pstart);
+    s->line_pattern_skip = pstart;
+}
+
+static void draw_line_pattern_next(ARTISTState *s)
+{
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start);
+    int endx = artist_get_x(s->blockmove_size);
+    int endy = artist_get_y(s->blockmove_size);
+    int line_xy = s->line_xy >> 16;
+
+    trace_artist_draw_line(startx, starty, endx, endy);
+    draw_line(s, startx, starty, endx, endy, false, s->line_pattern_skip,
+        s->line_pattern_skip + line_xy);
+    s->line_pattern_skip += line_xy;
+    s->image_bitmap_op ^= 2;
+}
+
+static void draw_line_size(ARTISTState *s, bool update_start)
+{
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start);
+    int endx = artist_get_x(s->line_size);
+    int endy = artist_get_y(s->line_size);
+
+    trace_artist_draw_line(startx, starty, endx, endy);
+    draw_line(s, startx, starty, endx, endy, update_start, -1, -1);
+}
+
+static void draw_line_xy(ARTISTState *s, bool update_start)
+{
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start);
+    int sizex = artist_get_x(s->blockmove_size);
+    int sizey = artist_get_y(s->blockmove_size);
+    int linexy = s->line_xy >> 16;
+    int endx, endy;
+
+    endx = startx;
+    endy = starty;
+
+    if (sizex > 0) {
+        endx = startx + linexy;
+    }
+
+    if (sizex < 0) {
+        endx = startx;
+        startx -= linexy;
+    }
+
+    if (sizey > 0) {
+        endy = starty + linexy;
+    }
+
+    if (sizey < 0) {
+        endy = starty;
+        starty -= linexy;
+    }
+
+    if (startx < 0) {
+        startx = 0;
+    }
+
+    if (endx < 0) {
+        endx = 0;
+    }
+
+    if (starty < 0) {
+        starty = 0;
+    }
+
+    if (endy < 0) {
+        endy = 0;
+    }
+
+
+    if (endx < 0) {
+        return;
+    }
+
+    if (endy < 0) {
+        return;
+    }
+
+    trace_artist_draw_line(startx, starty, endx, endy);
+    draw_line(s, startx, starty, endx, endy, false, -1, -1);
+}
+
+static void draw_line_end(ARTISTState *s, bool update_start)
+{
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start);
+    int endx = artist_get_x(s->line_end);
+    int endy = artist_get_y(s->line_end);
+
+    trace_artist_draw_line(startx, starty, endx, endy);
+    draw_line(s, startx, starty, endx, endy, update_start, -1, -1);
+}
+
+static void font_write16(ARTISTState *s, uint16_t val)
+{
+    struct vram_buffer *buf;
+    uint32_t color = (s->image_bitmap_op & 2) ? s->fg_color : s->bg_color;
+    uint16_t mask;
+    int i;
+
+    int startx = artist_get_x(s->vram_start);
+    int starty = artist_get_y(s->vram_start) + s->font_write_pos_y;
+    int offset = starty * s->width + startx;
+
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+
+    if (offset + 16 > buf->size) {
+        return;
+    }
+
+    for (i = 0; i < 16; i++) {
+        mask = 1 << (15 - i);
+        if (val & mask) {
+            artist_rop8(s, buf->data + offset + i, color);
+        } else {
+            if (!(s->image_bitmap_op & 0x20000000)) {
+                artist_rop8(s, buf->data + offset + i, s->bg_color);
+            }
+        }
+    }
+    artist_invalidate_lines(buf, starty, 1);
+}
+
+static void font_write(ARTISTState *s, uint32_t val)
+{
+    font_write16(s, val >> 16);
+    if (++s->font_write_pos_y == artist_get_y(s->blockmove_size)) {
+        s->vram_start += (s->blockmove_size & 0xffff0000);
+        return;
+    }
+
+    font_write16(s, val & 0xffff);
+    if (++s->font_write_pos_y == artist_get_y(s->blockmove_size)) {
+        s->vram_start += (s->blockmove_size & 0xffff0000);
+        return;
+    }
+}
+
+static void combine_write_reg(hwaddr addr, uint64_t val, int size, void *out)
+{
+    /*
+     * FIXME: is there a qemu helper for this?
+     */
+
+#ifndef HOST_WORDS_BIGENDIAN
+    addr ^= 3;
+#endif
+
+    switch (size) {
+    case 1:
+        *(uint8_t *)(out + (addr & 3)) = val;
+        break;
+
+    case 2:
+        *(uint16_t *)(out + (addr & 2)) = val;
+        break;
+
+    case 4:
+        *(uint32_t *)out = val;
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "unsupported write size: %d\n", size);
+    }
+}
+
+static void artist_reg_write(void *opaque, hwaddr addr, uint64_t val,
+        unsigned size)
+{
+    ARTISTState *s = opaque;
+    int posx, posy;
+    int width, height;
+
+    trace_artist_reg_write(size, addr, artist_reg_name(addr & ~3ULL), val);
+
+    switch (addr & ~3ULL) {
+    case 0x100080:
+        combine_write_reg(addr, val, size, &s->reg_100080);
+        break;
+
+    case FG_COLOR:
+        combine_write_reg(addr, val, size, &s->fg_color);
+        break;
+
+    case BG_COLOR:
+        combine_write_reg(addr, val, size, &s->bg_color);
+        break;
+
+    case VRAM_BITMASK:
+        combine_write_reg(addr, val, size, &s->vram_bitmask);
+        break;
+
+    case VRAM_WRITE_INCR_Y:
+        posx = (s->vram_pos >> 2) & 0x7ff;
+        posy = (s->vram_pos >> 13) & 0x3ff;
+        vram_bit_write(s, posx, posy + s->vram_char_y++, false, size, val);
+        break;
+
+    case VRAM_WRITE_INCR_X:
+    case VRAM_WRITE_INCR_X2:
+        posx = (s->vram_pos >> 2) & 0x7ff;
+        posy = (s->vram_pos >> 13) & 0x3ff;
+        vram_bit_write(s, posx, posy + s->vram_char_y, true, size, val);
+        break;
+
+    case VRAM_IDX:
+        combine_write_reg(addr, val, size, &s->vram_pos);
+        s->vram_char_y = 0;
+        s->draw_line_pattern = 0;
+        break;
+
+    case VRAM_START:
+        combine_write_reg(addr, val, size, &s->vram_start);
+        s->draw_line_pattern = 0;
+        break;
+
+    case VRAM_START_TRIGGER:
+        combine_write_reg(addr, val, size, &s->vram_start);
+        fill_window(s, artist_get_x(s->vram_start),
+                    artist_get_y(s->vram_start),
+                    artist_get_x(s->blockmove_size),
+                    artist_get_y(s->blockmove_size));
+        break;
+
+    case VRAM_SIZE_TRIGGER:
+        combine_write_reg(addr, val, size, &s->vram_size);
+
+        if (size == 2 && !(addr & 2)) {
+            height = artist_get_y(s->blockmove_size);
+        } else {
+            height = artist_get_y(s->vram_size);
+        }
+
+        if (size == 2 && (addr & 2)) {
+            width = artist_get_x(s->blockmove_size);
+        } else {
+            width = artist_get_x(s->vram_size);
+        }
+
+        fill_window(s, artist_get_x(s->vram_start),
+                    artist_get_y(s->vram_start),
+                    width, height);
+        break;
+
+    case LINE_XY:
+        combine_write_reg(addr, val, size, &s->line_xy);
+        if (s->draw_line_pattern) {
+            draw_line_pattern_next(s);
+        } else {
+            draw_line_xy(s, true);
+        }
+        break;
+
+    case PATTERN_LINE_START:
+        combine_write_reg(addr, val, size, &s->line_pattern_start);
+        s->draw_line_pattern = 1;
+        draw_line_pattern_start(s);
+        break;
+
+    case LINE_SIZE:
+        combine_write_reg(addr, val, size, &s->line_size);
+        draw_line_size(s, true);
+        break;
+
+    case LINE_END:
+        combine_write_reg(addr, val, size, &s->line_end);
+        draw_line_end(s, true);
+        break;
+
+    case BLOCK_MOVE_SIZE:
+        combine_write_reg(addr, val, size, &s->blockmove_size);
+        break;
+
+    case BLOCK_MOVE_SOURCE:
+        combine_write_reg(addr, val, size, &s->blockmove_source);
+        break;
+
+    case BLOCK_MOVE_DEST_TRIGGER:
+        combine_write_reg(addr, val, size, &s->blockmove_dest);
+
+        block_move(s, artist_get_x(s->blockmove_source),
+                artist_get_y(s->blockmove_source),
+                artist_get_x(s->blockmove_dest),
+                artist_get_y(s->blockmove_dest),
+                artist_get_x(s->blockmove_size),
+                artist_get_y(s->blockmove_size));
+        break;
+
+    case BLOCK_MOVE_SIZE_TRIGGER:
+        combine_write_reg(addr, val, size, &s->blockmove_size);
+
+        block_move(s,
+                artist_get_x(s->blockmove_source),
+                artist_get_y(s->blockmove_source),
+                artist_get_x(s->vram_start),
+                artist_get_y(s->vram_start),
+                artist_get_x(s->blockmove_size),
+                artist_get_y(s->blockmove_size));
+        break;
+
+    case PLANE_MASK:
+        combine_write_reg(addr, val, size, &s->plane_mask);
+        break;
+
+    case CMAP_BM_ACCESS:
+        combine_write_reg(addr, val, size, &s->cmap_bm_access);
+        break;
+
+    case DST_BM_ACCESS:
+        combine_write_reg(addr, val, size, &s->dst_bm_access);
+        s->cmap_bm_access = 0;
+        break;
+
+    case SRC_BM_ACCESS:
+        combine_write_reg(addr, val, size, &s->src_bm_access);
+        s->cmap_bm_access = 0;
+        break;
+
+    case CONTROL_PLANE:
+        combine_write_reg(addr, val, size, &s->control_plane);
+        break;
+
+    case TRANSFER_DATA:
+        combine_write_reg(addr, val, size, &s->transfer_data);
+        break;
+
+    case 0x300200:
+        combine_write_reg(addr, val, size, &s->reg_300200);
+        break;
+
+    case 0x300208:
+        combine_write_reg(addr, val, size, &s->reg_300208);
+        break;
+
+    case 0x300218:
+        combine_write_reg(addr, val, size, &s->reg_300218);
+        break;
+
+    case CURSOR_POS:
+        artist_invalidate_cursor(s);
+        combine_write_reg(addr, val, size, &s->cursor_pos);
+        artist_invalidate_cursor(s);
+        break;
+
+    case CURSOR_CTRL:
+        break;
+
+    case IMAGE_BITMAP_OP:
+        combine_write_reg(addr, val, size, &s->image_bitmap_op);
+        break;
+
+    case FONT_WRITE_INCR_Y:
+        combine_write_reg(addr, val, size, &s->font_write1);
+        font_write(s, s->font_write1);
+        break;
+
+    case FONT_WRITE_START:
+        combine_write_reg(addr, val, size, &s->font_write2);
+        s->font_write_pos_y = 0;
+        font_write(s, s->font_write2);
+        break;
+
+    case 300104:
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: unknown register: reg=%08lx val=%08lx"
+                " size=%d\n", __func__, addr, val, size);
+        break;
+    }
+}
+
+static uint64_t combine_read_reg(hwaddr addr, int size, void *in)
+{
+    /*
+     * FIXME: is there a qemu helper for this?
+     */
+
+#ifndef HOST_WORDS_BIGENDIAN
+    addr ^= 3;
+#endif
+
+    switch (size) {
+    case 1:
+        return *(uint8_t *)(in + (addr & 3));
+
+    case 2:
+        return *(uint16_t *)(in + (addr & 2));
+
+    case 4:
+        return *(uint32_t *)in;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "unsupported read size: %d\n", size);
+        return 0;
+    }
+}
+
+static uint64_t artist_reg_read(void *opaque, hwaddr addr, unsigned size)
+{
+    ARTISTState *s = opaque;
+    uint32_t val = 0;
+
+    switch (addr & ~3ULL) {
+        /* Unknown status registers */
+    case 0:
+        break;
+
+    case 0x211110:
+        val = (s->width << 16) | s->height;
+        if (s->depth == 1) {
+            val |= 1 << 31;
+        }
+        break;
+
+    case 0x100000:
+    case 0x300000:
+    case 0x300004:
+    case 0x300308:
+    case 0x380000:
+        break;
+
+    case 0x300008:
+    case 0x380008:
+        /*
+         * FIFO ready flag. we're not emulating the FIFOs
+         * so we're always ready
+         */
+        val = 0x10;
+        break;
+
+    case 0x300200:
+        val = s->reg_300200;
+        break;
+
+    case 0x300208:
+        val = s->reg_300208;
+        break;
+
+    case 0x300218:
+        val = s->reg_300218;
+        break;
+
+    case 0x30023c:
+        val = 0xac4ffdac;
+        break;
+
+    case 0x380004:
+        /* 0x02000000 Buserror */
+        val = 0x6dc20006;
+        break;
+
+    default:
+        qemu_log("%s: unknown register: %08lx size %d\n", __func__, addr, size);
+    }
+    val = combine_read_reg(addr, size, &val);
+    trace_artist_reg_read(size, addr, artist_reg_name(addr & ~3ULL), val);
+    return val;
+}
+
+static void artist_vram_write(void *opaque, hwaddr addr, uint64_t val,
+        unsigned size)
+{
+    ARTISTState *s = opaque;
+    struct vram_buffer *buf;
+    int posy = (addr >> 11) & 0x3ff;
+    int posx = addr & 0x7ff;
+    uint32_t offset;
+    trace_artist_vram_write(size, addr, val);
+
+    if (s->cmap_bm_access) {
+        buf = &s->vram_buffer[ARTIST_BUFFER_CMAP];
+        if (addr + 3 < buf->size) {
+            *(uint32_t *)(buf->data + addr) = val;
+        }
+        return;
+    }
+
+    buf = vram_write_buffer(s);
+    if (!buf->size) {
+        return;
+    }
+
+    if (posy > buf->height || posx > buf->width) {
+        return;
+    }
+
+    offset = posy * buf->width + posx;
+    switch (size) {
+    case 4:
+        *(uint32_t *)(buf->data + offset) = be32_to_cpu(val);
+        memory_region_set_dirty(&buf->mr, offset, 4);
+        break;
+    case 2:
+        *(uint16_t *)(buf->data + offset) = be16_to_cpu(val);
+        memory_region_set_dirty(&buf->mr, offset, 2);
+        break;
+    case 1:
+        *(uint8_t *)(buf->data + offset) = val;
+        memory_region_set_dirty(&buf->mr, offset, 1);
+        break;
+    default:
+        break;
+    }
+}
+
+static uint64_t artist_vram_read(void *opaque, hwaddr addr, unsigned size)
+{
+    ARTISTState *s = opaque;
+    struct vram_buffer *buf;
+    uint64_t val;
+    int posy, posx;
+
+    if (s->cmap_bm_access) {
+        buf = &s->vram_buffer[ARTIST_BUFFER_CMAP];
+        val = *(uint32_t *)(buf->data + addr);
+        trace_artist_vram_read(size, addr, 0, 0, val);
+        return 0;
+    }
+
+    buf = vram_read_buffer(s);
+    if (!buf->size) {
+            return 0;
+    }
+
+    posy = (addr >> 13) & 0x3ff;
+    posx = (addr >> 2) & 0x7ff;
+
+    if (posy > buf->height || posx > buf->width) {
+        return 0;
+    }
+
+    val = cpu_to_be32(*(uint32_t *)(buf->data + posy * buf->width + posx));
+    trace_artist_vram_read(size, addr, posx, posy, val);
+    return val;
+}
+
+static const MemoryRegionOps artist_reg_ops = {
+    .read = artist_reg_read,
+    .write = artist_reg_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+};
+
+static const MemoryRegionOps artist_vram_ops = {
+    .read = artist_vram_read,
+    .write = artist_vram_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+};
+
+static void artist_draw_cursor(ARTISTState *s)
+{
+    DisplaySurface *surface = qemu_console_surface(s->con);
+    uint32_t *data = (uint32_t *)surface_data(surface);
+    struct vram_buffer *cursor0, *cursor1 , *buf;
+    int cx, cy, cursor_pos_x, cursor_pos_y;
+
+    cursor0 = &s->vram_buffer[ARTIST_BUFFER_CURSOR1];
+    cursor1 = &s->vram_buffer[ARTIST_BUFFER_CURSOR2];
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+
+    artist_get_cursor_pos(s, &cursor_pos_x, &cursor_pos_y);
+
+    for (cy = 0; cy < s->cursor_height; cy++) {
+
+        for (cx = 0; cx < s->cursor_width; cx++) {
+
+            if (cursor_pos_y + cy < 0 ||
+                cursor_pos_x + cx < 0 ||
+                cursor_pos_y + cy > buf->height - 1 ||
+                cursor_pos_x + cx > buf->width) {
+                continue;
+            }
+
+            int dstoffset = (cursor_pos_y + cy) * s->width +
+                 (cursor_pos_x + cx);
+
+            if (cursor0->data[cy * cursor0->width + cx]) {
+                data[dstoffset] = 0;
+            } else {
+                if (cursor1->data[cy * cursor1->width + cx]) {
+                    data[dstoffset] = 0xffffff;
+                }
+            }
+        }
+    }
+}
+
+static void artist_draw_line(void *opaque, uint8_t *d, const uint8_t *src,
+                             int width, int pitch)
+{
+    ARTISTState *s = ARTIST(opaque);
+    uint32_t *cmap, *data = (uint32_t *)d;
+    int x;
+
+    cmap = (uint32_t *)(s->vram_buffer[ARTIST_BUFFER_CMAP].data + 0x400);
+
+    for (x = 0; x < s->width; x++) {
+        *data++ = cmap[*src++];
+    }
+}
+
+static void artist_update_display(void *opaque)
+{
+    ARTISTState *s = opaque;
+    DisplaySurface *surface = qemu_console_surface(s->con);
+    int first = 0, last;
+
+
+    framebuffer_update_display(surface, &s->fbsection, s->width, s->height,
+                               s->width, s->width * 4, 0, 0, artist_draw_line,
+                               s, &first, &last);
+
+    artist_draw_cursor(s);
+
+    dpy_gfx_update(s->con, 0, 0, s->width, s->height);
+}
+
+static void artist_invalidate(void *opaque)
+{
+    ARTISTState *s = ARTIST(opaque);
+    struct vram_buffer *buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+    memory_region_set_dirty(&buf->mr, 0, buf->size);
+}
+
+static const GraphicHwOps artist_ops = {
+    .invalidate  = artist_invalidate,
+    .gfx_update = artist_update_display,
+};
+
+static void artist_initfn(Object *obj)
+{
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    ARTISTState *s = ARTIST(obj);
+
+    memory_region_init_io(&s->reg, obj, &artist_reg_ops, s, "artist.reg",
+            4 * MiB);
+    memory_region_init_io(&s->vram_mem, obj, &artist_vram_ops, s, "artist.vram",
+            8 * MiB);
+    sysbus_init_mmio(sbd, &s->reg);
+    sysbus_init_mmio(sbd, &s->vram_mem);
+}
+
+static void artist_create_buffer(ARTISTState *s, const char *name,
+                              hwaddr *offset, unsigned int idx,
+                              int width, int height)
+{
+    struct vram_buffer *buf = s->vram_buffer + idx;
+
+    memory_region_init_ram(&buf->mr, NULL, name, width * height,
+                           &error_fatal);
+    memory_region_add_subregion_overlap(&s->mem_as_root, *offset, &buf->mr, 0);
+
+    buf->data = memory_region_get_ram_ptr(&buf->mr);
+    buf->size = height * width;
+    buf->width = width;
+    buf->height = height;
+
+    *offset += buf->size;
+}
+
+static void artist_realizefn(DeviceState *dev, Error **errp)
+{
+    ARTISTState *s = ARTIST(dev);
+    struct vram_buffer *buf;
+    hwaddr offset = 0;
+
+    memory_region_init(&s->mem_as_root, OBJECT(dev), "artist", ~0ull);
+    address_space_init(&s->as, &s->mem_as_root, "artist");
+
+    artist_create_buffer(s, "cmap", &offset, ARTIST_BUFFER_CMAP, 2048, 4);
+    artist_create_buffer(s, "ap", &offset, ARTIST_BUFFER_AP,
+                         s->width, s->height);
+    artist_create_buffer(s, "cursor1", &offset, ARTIST_BUFFER_CURSOR1, 64, 64);
+    artist_create_buffer(s, "cursor2", &offset, ARTIST_BUFFER_CURSOR2, 64, 64);
+    artist_create_buffer(s, "attribute", &offset, ARTIST_BUFFER_ATTRIBUTE,
+                        64, 64);
+
+    buf = &s->vram_buffer[ARTIST_BUFFER_AP];
+    framebuffer_update_memory_section(&s->fbsection, &buf->mr, 0,
+                                      buf->width, buf->height);
+    /*
+     * no idea whether the cursor is fixed size or not, so assume 32x32 which
+     * seems sufficient for HP-UX X11.
+     */
+    s->cursor_height = 32;
+    s->cursor_width = 32;
+
+    s->con = graphic_console_init(DEVICE(dev), 0, &artist_ops, s);
+    qemu_console_resize(s->con, s->width, s->height);
+}
+
+static int vmstate_artist_post_load(void *opaque, int version_id)
+{
+    artist_invalidate(opaque);
+    return 0;
+}
+
+static const VMStateDescription vmstate_artist = {
+    .name = "artist",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .post_load = vmstate_artist_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT16(height, ARTISTState),
+        VMSTATE_UINT16(width, ARTISTState),
+        VMSTATE_UINT16(depth, ARTISTState),
+        VMSTATE_UINT32(fg_color, ARTISTState),
+        VMSTATE_UINT32(bg_color, ARTISTState),
+        VMSTATE_UINT32(vram_char_y, ARTISTState),
+        VMSTATE_UINT32(vram_bitmask, ARTISTState),
+        VMSTATE_UINT32(vram_start, ARTISTState),
+        VMSTATE_UINT32(vram_pos, ARTISTState),
+        VMSTATE_UINT32(vram_size, ARTISTState),
+        VMSTATE_UINT32(blockmove_source, ARTISTState),
+        VMSTATE_UINT32(blockmove_dest, ARTISTState),
+        VMSTATE_UINT32(blockmove_size, ARTISTState),
+        VMSTATE_UINT32(line_size, ARTISTState),
+        VMSTATE_UINT32(line_end, ARTISTState),
+        VMSTATE_UINT32(line_xy, ARTISTState),
+        VMSTATE_UINT32(cursor_pos, ARTISTState),
+        VMSTATE_UINT32(cursor_height, ARTISTState),
+        VMSTATE_UINT32(cursor_width, ARTISTState),
+        VMSTATE_UINT32(plane_mask, ARTISTState),
+        VMSTATE_UINT32(reg_100080, ARTISTState),
+        VMSTATE_UINT32(reg_300200, ARTISTState),
+        VMSTATE_UINT32(reg_300208, ARTISTState),
+        VMSTATE_UINT32(reg_300218, ARTISTState),
+        VMSTATE_UINT32(cmap_bm_access, ARTISTState),
+        VMSTATE_UINT32(dst_bm_access, ARTISTState),
+        VMSTATE_UINT32(src_bm_access, ARTISTState),
+        VMSTATE_UINT32(control_plane, ARTISTState),
+        VMSTATE_UINT32(transfer_data, ARTISTState),
+        VMSTATE_UINT32(image_bitmap_op, ARTISTState),
+        VMSTATE_UINT32(font_write1, ARTISTState),
+        VMSTATE_UINT32(font_write2, ARTISTState),
+        VMSTATE_UINT32(font_write_pos_y, ARTISTState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property artist_properties[] = {
+    DEFINE_PROP_UINT16("width",        ARTISTState, width, 1280),
+    DEFINE_PROP_UINT16("height",       ARTISTState, height, 1024),
+    DEFINE_PROP_UINT16("depth",        ARTISTState, depth, 8),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void artist_reset(DeviceState *qdev)
+{
+}
+
+static void artist_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = artist_realizefn;
+    dc->vmsd = &vmstate_artist;
+    dc->props = artist_properties;
+    dc->reset = artist_reset;
+}
+
+static const TypeInfo artist_info = {
+    .name          = TYPE_ARTIST,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(ARTISTState),
+    .instance_init = artist_initfn,
+    .class_init    = artist_class_init,
+};
+
+static void artist_register_types(void)
+{
+    type_register_static(&artist_info);
+}
+
+type_init(artist_register_types)
diff --git a/hw/display/trace-events b/hw/display/trace-events
index ba7787b180..e6e22bef88 100644
--- a/hw/display/trace-events
+++ b/hw/display/trace-events
@@ -142,3 +142,12 @@  sii9022_switch_mode(const char *mode) "mode: %s"
 # ati.c
 ati_mm_read(unsigned int size, uint64_t addr, const char *name, uint64_t val) "%u 0x%"PRIx64 " %s -> 0x%"PRIx64
 ati_mm_write(unsigned int size, uint64_t addr, const char *name, uint64_t val) "%u 0x%"PRIx64 " %s <- 0x%"PRIx64
+
+# artist.c
+artist_reg_read(unsigned int size, uint64_t addr, const char *name, uint64_t val) "%u 0x%"PRIx64 "%s -> 0x%"PRIx64
+artist_reg_write(unsigned int size, uint64_t addr, const char *name, uint64_t val) "%u 0x%"PRIx64 "%s <- 0x%"PRIx64
+artist_vram_read(unsigned int size, uint64_t addr, int posx, int posy, uint64_t val) "%u 0x%"PRIx64 " %ux%u-> 0x%"PRIx64
+artist_vram_write(unsigned int size, uint64_t addr, uint64_t val) "%u 0x%"PRIx64 " <- 0x%"PRIx64
+artist_fill_window(unsigned int start_x, unsigned int start_y, unsigned int width, unsigned int height, uint32_t op, uint32_t ctlpln) "start=%ux%u length=%ux%u op=0x%08x ctlpln=0x%08x"
+artist_block_move(unsigned int start_x, unsigned int start_y, unsigned int dest_x, unsigned int dest_y, unsigned int width, unsigned int height) "source %ux%u -> dest %ux%u size %ux%u"
+artist_draw_line(unsigned int start_x, unsigned int start_y, unsigned int end_x, unsigned int end_y) "%ux%u %ux%u"
diff --git a/hw/hppa/Kconfig b/hw/hppa/Kconfig
index 7f9be7f25c..82178c7dcb 100644
--- a/hw/hppa/Kconfig
+++ b/hw/hppa/Kconfig
@@ -12,3 +12,4 @@  config DINO
     select LSI_SCSI_PCI
     select LASI_82596
     select LASIPS2
+    select ARTIST
diff --git a/hw/hppa/hppa_hardware.h b/hw/hppa/hppa_hardware.h
index 507f91e05d..4a2fe2df60 100644
--- a/hw/hppa/hppa_hardware.h
+++ b/hw/hppa/hppa_hardware.h
@@ -22,6 +22,7 @@ 
 #define LASI_PS2KBD_HPA 0xffd08000
 #define LASI_PS2MOU_HPA 0xffd08100
 #define LASI_GFX_HPA    0xf8000000
+#define ARTIST_FB_ADDR  0xf9000000
 #define CPU_HPA         0xfffb0000
 #define MEMORY_HPA      0xfffbf000
 
diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index 967738477a..9d0192c4fa 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -74,6 +74,7 @@  static void machine_hppa_init(MachineState *machine)
     MemoryRegion *cpu_region;
     long i;
     unsigned int smp_cpus = machine->smp.cpus;
+    SysBusDevice *s;
 
     ram_size = machine->ram_size;
 
@@ -126,6 +127,14 @@  static void machine_hppa_init(MachineState *machine)
     dev = DEVICE(pci_create_simple(pci_bus, -1, "lsi53c895a"));
     lsi53c8xx_handle_legacy_cmdline(dev);
 
+    if (vga_interface_type != VGA_NONE) {
+        dev = qdev_create(NULL, "artist");
+        qdev_init_nofail(dev);
+        s = SYS_BUS_DEVICE(dev);
+        sysbus_mmio_map(s, 0, LASI_GFX_HPA);
+        sysbus_mmio_map(s, 1, ARTIST_FB_ADDR);
+    }
+
     /* Network setup.  e1000 is good enough, failing Tulip support.  */
     for (i = 0; i < nb_nics; i++) {
         if (!enable_lasi_lan()) {