sm501: Fix device endianness

We only emulate the sysbus device in its default LE mode and PCI is LE
as well so specify this for registers and framebuffer memory.

Note that though the Linux kernel driver has code which claims to
handle both big and little endian, it is obviously bogus for 16 bit
and cannot be trusted as a source of information on the framebuffer
pixel format. This is our best guess about device behaviour based on
the specs and testing with MorphOS that is known to work on real HW.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Message-id: 8b9605a569f8bf54074e15903620b18cd9967c89.1492787889.git.balaton@eik.bme.hu
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index c92a5fa45814f352841bce4327c1771ec908b6ae..a628ef194d4092af1e6edcc0ef00100ae42a6f8e 100644 (file)
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -850,7 +850,7 @@ static const MemoryRegionOps sm501_system_config_ops = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static uint32_t sm501_palette_read(void *opaque, hwaddr addr)
@@ -1086,7 +1086,7 @@ static const MemoryRegionOps sm501_disp_ctrl_ops = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static uint64_t sm501_2d_engine_read(void *opaque, hwaddr addr,
@@ -1174,7 +1174,7 @@ static const MemoryRegionOps sm501_2d_engine_ops = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 /* draw line functions for all console modes */
@@ -1510,7 +1510,7 @@ static void sm501_realize_sysbus(DeviceState *dev, Error **errp)
     if (s->chr_state) {
         serial_mm_init(&s->state.mmio_region, SM501_UART0, 2,
                        NULL, /* TODO : chain irq to IRL */
-                       115200, s->chr_state, DEVICE_NATIVE_ENDIAN);
+                       115200, s->chr_state, DEVICE_LITTLE_ENDIAN);
     }
 }
 

diff --git a/hw/display/sm501_template.h b/hw/display/sm501_template.h
index 832ee6177b0ad9bf43457f6fe14dacf3f8c910a7..54807bdc6ecbe5da999d81a3e9308fdc47819745 100644 (file)
--- a/hw/display/sm501_template.h
+++ b/hw/display/sm501_template.h
@@ -64,10 +64,10 @@ static void glue(draw_line16_, PIXEL_NAME)(
     uint8_t r, g, b;
 
     do {
-        rgb565 = lduw_p(s);
-        r = ((rgb565 >> 11) & 0x1f) << 3;
-        g = ((rgb565 >>  5) & 0x3f) << 2;
-        b = ((rgb565 >>  0) & 0x1f) << 3;
+        rgb565 = lduw_le_p(s);
+        r = (rgb565 >> 8) & 0xf8;
+        g = (rgb565 >> 3) & 0xfc;
+        b = (rgb565 << 3) & 0xf8;
         *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
         s += 2;
         d += BPP;
@@ -80,16 +80,9 @@ static void glue(draw_line32_, PIXEL_NAME)(
     uint8_t r, g, b;
 
     do {
-        ldub_p(s);
-#if defined(TARGET_WORDS_BIGENDIAN)
-        r = s[1];
-        g = s[2];
-        b = s[3];
-#else
-        b = s[0];
-        g = s[1];
         r = s[2];
-#endif
+        g = s[1];
+        b = s[0];
         *(PIXEL_TYPE *)d = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
         s += 4;
         d += BPP;