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macfb: implement mode sense to allow display type to be detected

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The MacOS toolbox ROM uses the monitor sense to detect the display type and then
offer a fixed set of resolutions and colour depths accordingly. Implement the
monitor sense using information found in Apple Technical Note HW26: "Macintosh
Quadra Built-In Video" along with some local experiments.

Since the default configuration is 640 x 480 with 8-bit colour then hardcode
the sense register to return MACFB_DISPLAY_VGA for now.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211007221253.29024-8-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-10-07 23:12:47 +01:00 • committed by Laurent Vivier
parent 4ec27073fd
commit e6108b9636
3 changed files with 137 additions and 2 deletions
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20
include/hw/display/macfb.h
View file

@ -17,6 +17,24 @@
#include "ui/console.h"
#include "qom/object.h"
typedef enum {
MACFB_DISPLAY_APPLE_21_COLOR = 0,
MACFB_DISPLAY_APPLE_PORTRAIT = 1,
MACFB_DISPLAY_APPLE_12_RGB = 2,
MACFB_DISPLAY_APPLE_2PAGE_MONO = 3,
MACFB_DISPLAY_NTSC_UNDERSCAN = 4,
MACFB_DISPLAY_NTSC_OVERSCAN = 5,
MACFB_DISPLAY_APPLE_12_MONO = 6,
MACFB_DISPLAY_APPLE_13_RGB = 7,
MACFB_DISPLAY_16_COLOR = 8,
MACFB_DISPLAY_PAL1_UNDERSCAN = 9,
MACFB_DISPLAY_PAL1_OVERSCAN = 10,
MACFB_DISPLAY_PAL2_UNDERSCAN = 11,
MACFB_DISPLAY_PAL2_OVERSCAN = 12,
MACFB_DISPLAY_VGA = 13,
MACFB_DISPLAY_SVGA = 14,
} MacfbDisplayType;
typedef struct MacfbState {
MemoryRegion mem_vram;
MemoryRegion mem_ctrl;
@ -28,6 +46,8 @@ typedef struct MacfbState {
uint8_t color_palette[256 * 3];
uint32_t width, height; /* in pixels */
uint8_t depth;
uint32_t sense;
} MacfbState;
#define TYPE_MACFB "sysbus-macfb"