e6108b9636
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>
604 lines
16 KiB
C
604 lines
16 KiB
C
/*
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* QEMU Motorola 680x0 Macintosh Video Card Emulation
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* Copyright (c) 2012-2018 Laurent Vivier
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*
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* some parts from QEMU G364 framebuffer Emulator.
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* Copyright (c) 2007-2011 Herve Poussineau
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "hw/sysbus.h"
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#include "ui/console.h"
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#include "ui/pixel_ops.h"
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#include "hw/nubus/nubus.h"
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#include "hw/display/macfb.h"
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#include "qapi/error.h"
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#include "hw/qdev-properties.h"
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#include "migration/vmstate.h"
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#include "trace.h"
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#define VIDEO_BASE 0x00001000
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#define DAFB_BASE 0x00800000
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#define MACFB_PAGE_SIZE 4096
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#define MACFB_VRAM_SIZE (4 * MiB)
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#define DAFB_MODE_SENSE 0x1c
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#define DAFB_RESET 0x200
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#define DAFB_LUT 0x213
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/*
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* Quadra sense codes taken from Apple Technical Note HW26:
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* "Macintosh Quadra Built-In Video". The sense codes and
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* extended sense codes have different meanings:
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*
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* Sense:
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* bit 2: SENSE2 (pin 10)
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* bit 1: SENSE1 (pin 7)
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* bit 0: SENSE0 (pin 4)
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*
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* 0 = pin tied to ground
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* 1 = pin unconnected
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*
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* Extended Sense:
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* bit 2: pins 4-10
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* bit 1: pins 10-7
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* bit 0: pins 7-4
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*
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* 0 = pins tied together
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* 1 = pins unconnected
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*
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* Reads from the sense register appear to be active low, i.e. a 1 indicates
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* that the pin is tied to ground, a 0 indicates the pin is disconnected.
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*
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* Writes to the sense register appear to activate pulldowns i.e. a 1 enables
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* a pulldown on a particular pin.
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*
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* The MacOS toolbox appears to use a series of reads and writes to first
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* determine if extended sense is to be used, and then check which pins are
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* tied together in order to determine the display type.
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*/
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typedef struct MacFbSense {
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uint8_t type;
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uint8_t sense;
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uint8_t ext_sense;
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} MacFbSense;
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static MacFbSense macfb_sense_table[] = {
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{ MACFB_DISPLAY_APPLE_21_COLOR, 0x0, 0 },
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{ MACFB_DISPLAY_APPLE_PORTRAIT, 0x1, 0 },
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{ MACFB_DISPLAY_APPLE_12_RGB, 0x2, 0 },
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{ MACFB_DISPLAY_APPLE_2PAGE_MONO, 0x3, 0 },
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{ MACFB_DISPLAY_NTSC_UNDERSCAN, 0x4, 0 },
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{ MACFB_DISPLAY_NTSC_OVERSCAN, 0x4, 0 },
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{ MACFB_DISPLAY_APPLE_12_MONO, 0x6, 0 },
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{ MACFB_DISPLAY_APPLE_13_RGB, 0x6, 0 },
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{ MACFB_DISPLAY_16_COLOR, 0x7, 0x3 },
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{ MACFB_DISPLAY_PAL1_UNDERSCAN, 0x7, 0x0 },
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{ MACFB_DISPLAY_PAL1_OVERSCAN, 0x7, 0x0 },
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{ MACFB_DISPLAY_PAL2_UNDERSCAN, 0x7, 0x6 },
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{ MACFB_DISPLAY_PAL2_OVERSCAN, 0x7, 0x6 },
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{ MACFB_DISPLAY_VGA, 0x7, 0x5 },
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{ MACFB_DISPLAY_SVGA, 0x7, 0x5 },
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};
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typedef void macfb_draw_line_func(MacfbState *s, uint8_t *d, uint32_t addr,
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int width);
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static inline uint8_t macfb_read_byte(MacfbState *s, uint32_t addr)
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{
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return s->vram[addr & s->vram_bit_mask];
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}
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/* 1-bit color */
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static void macfb_draw_line1(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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int bit = x & 7;
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int idx = (macfb_read_byte(s, addr) >> (7 - bit)) & 1;
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r = g = b = ((1 - idx) << 7);
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addr += (bit == 7);
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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/* 2-bit color */
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static void macfb_draw_line2(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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int bit = (x & 3);
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int idx = (macfb_read_byte(s, addr) >> ((3 - bit) << 1)) & 3;
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r = s->color_palette[idx * 3];
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g = s->color_palette[idx * 3 + 1];
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b = s->color_palette[idx * 3 + 2];
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addr += (bit == 3);
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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/* 4-bit color */
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static void macfb_draw_line4(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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int bit = x & 1;
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int idx = (macfb_read_byte(s, addr) >> ((1 - bit) << 2)) & 15;
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r = s->color_palette[idx * 3];
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g = s->color_palette[idx * 3 + 1];
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b = s->color_palette[idx * 3 + 2];
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addr += (bit == 1);
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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/* 8-bit color */
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static void macfb_draw_line8(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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r = s->color_palette[macfb_read_byte(s, addr) * 3];
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g = s->color_palette[macfb_read_byte(s, addr) * 3 + 1];
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b = s->color_palette[macfb_read_byte(s, addr) * 3 + 2];
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addr++;
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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/* 16-bit color */
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static void macfb_draw_line16(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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uint16_t pixel;
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pixel = (macfb_read_byte(s, addr) << 8) | macfb_read_byte(s, addr + 1);
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r = ((pixel >> 10) & 0x1f) << 3;
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g = ((pixel >> 5) & 0x1f) << 3;
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b = (pixel & 0x1f) << 3;
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addr += 2;
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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/* 24-bit color */
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static void macfb_draw_line24(MacfbState *s, uint8_t *d, uint32_t addr,
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int width)
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{
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uint8_t r, g, b;
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int x;
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for (x = 0; x < width; x++) {
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r = macfb_read_byte(s, addr);
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g = macfb_read_byte(s, addr + 1);
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b = macfb_read_byte(s, addr + 2);
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addr += 3;
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*(uint32_t *)d = rgb_to_pixel32(r, g, b);
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d += 4;
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}
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}
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enum {
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MACFB_DRAW_LINE1,
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MACFB_DRAW_LINE2,
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MACFB_DRAW_LINE4,
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MACFB_DRAW_LINE8,
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MACFB_DRAW_LINE16,
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MACFB_DRAW_LINE24,
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MACFB_DRAW_LINE_NB,
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};
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static macfb_draw_line_func * const
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macfb_draw_line_table[MACFB_DRAW_LINE_NB] = {
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macfb_draw_line1,
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macfb_draw_line2,
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macfb_draw_line4,
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macfb_draw_line8,
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macfb_draw_line16,
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macfb_draw_line24,
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};
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static int macfb_check_dirty(MacfbState *s, DirtyBitmapSnapshot *snap,
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ram_addr_t addr, int len)
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{
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return memory_region_snapshot_get_dirty(&s->mem_vram, snap, addr, len);
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}
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static void macfb_draw_graphic(MacfbState *s)
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{
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DisplaySurface *surface = qemu_console_surface(s->con);
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DirtyBitmapSnapshot *snap = NULL;
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ram_addr_t page;
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uint32_t v = 0;
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int y, ymin;
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int macfb_stride = (s->depth * s->width + 7) / 8;
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macfb_draw_line_func *macfb_draw_line;
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switch (s->depth) {
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case 1:
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v = MACFB_DRAW_LINE1;
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break;
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case 2:
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v = MACFB_DRAW_LINE2;
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break;
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case 4:
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v = MACFB_DRAW_LINE4;
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break;
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case 8:
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v = MACFB_DRAW_LINE8;
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break;
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case 16:
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v = MACFB_DRAW_LINE16;
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break;
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case 24:
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v = MACFB_DRAW_LINE24;
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break;
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}
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macfb_draw_line = macfb_draw_line_table[v];
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assert(macfb_draw_line != NULL);
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snap = memory_region_snapshot_and_clear_dirty(&s->mem_vram, 0x0,
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memory_region_size(&s->mem_vram),
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DIRTY_MEMORY_VGA);
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ymin = -1;
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page = 0;
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for (y = 0; y < s->height; y++, page += macfb_stride) {
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if (macfb_check_dirty(s, snap, page, macfb_stride)) {
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uint8_t *data_display;
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data_display = surface_data(surface) + y * surface_stride(surface);
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macfb_draw_line(s, data_display, page, s->width);
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if (ymin < 0) {
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ymin = y;
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}
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} else {
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if (ymin >= 0) {
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dpy_gfx_update(s->con, 0, ymin, s->width, y - ymin);
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ymin = -1;
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}
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}
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}
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if (ymin >= 0) {
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dpy_gfx_update(s->con, 0, ymin, s->width, y - ymin);
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}
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g_free(snap);
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}
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static void macfb_invalidate_display(void *opaque)
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{
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MacfbState *s = opaque;
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memory_region_set_dirty(&s->mem_vram, 0, MACFB_VRAM_SIZE);
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}
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static uint32_t macfb_sense_read(MacfbState *s)
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{
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MacFbSense *macfb_sense;
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uint8_t sense;
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macfb_sense = &macfb_sense_table[MACFB_DISPLAY_VGA];
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if (macfb_sense->sense == 0x7) {
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/* Extended sense */
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sense = 0;
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if (!(macfb_sense->ext_sense & 1)) {
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/* Pins 7-4 together */
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if (~s->sense & 3) {
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sense = (~s->sense & 7) | 3;
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}
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}
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if (!(macfb_sense->ext_sense & 2)) {
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/* Pins 10-7 together */
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if (~s->sense & 6) {
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sense = (~s->sense & 7) | 6;
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}
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}
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if (!(macfb_sense->ext_sense & 4)) {
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/* Pins 4-10 together */
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if (~s->sense & 5) {
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sense = (~s->sense & 7) | 5;
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}
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}
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} else {
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/* Normal sense */
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sense = (~macfb_sense->sense & 7) | (~s->sense & 7);
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}
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trace_macfb_sense_read(sense);
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return sense;
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}
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static void macfb_sense_write(MacfbState *s, uint32_t val)
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{
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s->sense = val;
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trace_macfb_sense_write(val);
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return;
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}
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static void macfb_update_display(void *opaque)
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{
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MacfbState *s = opaque;
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DisplaySurface *surface = qemu_console_surface(s->con);
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qemu_flush_coalesced_mmio_buffer();
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if (s->width == 0 || s->height == 0) {
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return;
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}
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if (s->width != surface_width(surface) ||
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s->height != surface_height(surface)) {
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qemu_console_resize(s->con, s->width, s->height);
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}
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macfb_draw_graphic(s);
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}
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static void macfb_reset(MacfbState *s)
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{
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int i;
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s->palette_current = 0;
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for (i = 0; i < 256; i++) {
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s->color_palette[i * 3] = 255 - i;
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s->color_palette[i * 3 + 1] = 255 - i;
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s->color_palette[i * 3 + 2] = 255 - i;
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}
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memset(s->vram, 0, MACFB_VRAM_SIZE);
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macfb_invalidate_display(s);
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}
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static uint64_t macfb_ctrl_read(void *opaque,
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hwaddr addr,
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unsigned int size)
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{
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MacfbState *s = opaque;
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uint64_t val = 0;
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switch (addr) {
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case DAFB_MODE_SENSE:
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val = macfb_sense_read(s);
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break;
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}
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trace_macfb_ctrl_read(addr, val, size);
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return val;
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}
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static void macfb_ctrl_write(void *opaque,
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hwaddr addr,
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uint64_t val,
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unsigned int size)
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{
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MacfbState *s = opaque;
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switch (addr) {
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case DAFB_MODE_SENSE:
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macfb_sense_write(s, val);
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break;
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case DAFB_RESET:
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s->palette_current = 0;
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break;
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case DAFB_LUT:
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s->color_palette[s->palette_current] = val;
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s->palette_current = (s->palette_current + 1) %
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ARRAY_SIZE(s->color_palette);
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if (s->palette_current % 3) {
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macfb_invalidate_display(s);
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}
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break;
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}
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trace_macfb_ctrl_write(addr, val, size);
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}
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static const MemoryRegionOps macfb_ctrl_ops = {
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.read = macfb_ctrl_read,
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.write = macfb_ctrl_write,
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.endianness = DEVICE_BIG_ENDIAN,
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.impl.min_access_size = 1,
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.impl.max_access_size = 4,
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};
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static int macfb_post_load(void *opaque, int version_id)
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{
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macfb_invalidate_display(opaque);
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return 0;
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}
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static const VMStateDescription vmstate_macfb = {
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.name = "macfb",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.post_load = macfb_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8_ARRAY(color_palette, MacfbState, 256 * 3),
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VMSTATE_UINT32(palette_current, MacfbState),
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VMSTATE_UINT32(sense, MacfbState),
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VMSTATE_END_OF_LIST()
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}
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};
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static const GraphicHwOps macfb_ops = {
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.invalidate = macfb_invalidate_display,
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.gfx_update = macfb_update_display,
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};
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static bool macfb_common_realize(DeviceState *dev, MacfbState *s, Error **errp)
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{
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DisplaySurface *surface;
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if (s->depth != 1 && s->depth != 2 && s->depth != 4 && s->depth != 8 &&
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s->depth != 16 && s->depth != 24) {
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error_setg(errp, "unknown guest depth %d", s->depth);
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return false;
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}
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s->con = graphic_console_init(dev, 0, &macfb_ops, s);
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surface = qemu_console_surface(s->con);
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if (surface_bits_per_pixel(surface) != 32) {
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error_setg(errp, "unknown host depth %d",
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surface_bits_per_pixel(surface));
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return false;
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}
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memory_region_init_io(&s->mem_ctrl, OBJECT(dev), &macfb_ctrl_ops, s,
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"macfb-ctrl", 0x1000);
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memory_region_init_ram(&s->mem_vram, OBJECT(dev), "macfb-vram",
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MACFB_VRAM_SIZE, &error_abort);
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s->vram = memory_region_get_ram_ptr(&s->mem_vram);
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s->vram_bit_mask = MACFB_VRAM_SIZE - 1;
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memory_region_set_coalescing(&s->mem_vram);
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return true;
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}
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static void macfb_sysbus_realize(DeviceState *dev, Error **errp)
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{
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MacfbSysBusState *s = MACFB(dev);
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MacfbState *ms = &s->macfb;
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if (!macfb_common_realize(dev, ms, errp)) {
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return;
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}
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sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_ctrl);
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sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_vram);
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}
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static void macfb_nubus_realize(DeviceState *dev, Error **errp)
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{
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NubusDevice *nd = NUBUS_DEVICE(dev);
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MacfbNubusState *s = NUBUS_MACFB(dev);
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MacfbNubusDeviceClass *ndc = NUBUS_MACFB_GET_CLASS(dev);
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MacfbState *ms = &s->macfb;
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ndc->parent_realize(dev, errp);
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if (*errp) {
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return;
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}
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if (!macfb_common_realize(dev, ms, errp)) {
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return;
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}
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memory_region_add_subregion(&nd->slot_mem, DAFB_BASE, &ms->mem_ctrl);
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memory_region_add_subregion(&nd->slot_mem, VIDEO_BASE, &ms->mem_vram);
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}
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static void macfb_sysbus_reset(DeviceState *d)
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{
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MacfbSysBusState *s = MACFB(d);
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macfb_reset(&s->macfb);
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}
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static void macfb_nubus_reset(DeviceState *d)
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{
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MacfbNubusState *s = NUBUS_MACFB(d);
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macfb_reset(&s->macfb);
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}
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static Property macfb_sysbus_properties[] = {
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DEFINE_PROP_UINT32("width", MacfbSysBusState, macfb.width, 640),
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DEFINE_PROP_UINT32("height", MacfbSysBusState, macfb.height, 480),
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DEFINE_PROP_UINT8("depth", MacfbSysBusState, macfb.depth, 8),
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DEFINE_PROP_END_OF_LIST(),
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};
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static Property macfb_nubus_properties[] = {
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DEFINE_PROP_UINT32("width", MacfbNubusState, macfb.width, 640),
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DEFINE_PROP_UINT32("height", MacfbNubusState, macfb.height, 480),
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DEFINE_PROP_UINT8("depth", MacfbNubusState, macfb.depth, 8),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void macfb_sysbus_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = macfb_sysbus_realize;
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dc->desc = "SysBus Macintosh framebuffer";
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dc->reset = macfb_sysbus_reset;
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dc->vmsd = &vmstate_macfb;
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device_class_set_props(dc, macfb_sysbus_properties);
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}
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static void macfb_nubus_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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MacfbNubusDeviceClass *ndc = NUBUS_MACFB_CLASS(klass);
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device_class_set_parent_realize(dc, macfb_nubus_realize,
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&ndc->parent_realize);
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dc->desc = "Nubus Macintosh framebuffer";
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dc->reset = macfb_nubus_reset;
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dc->vmsd = &vmstate_macfb;
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set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
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device_class_set_props(dc, macfb_nubus_properties);
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}
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static TypeInfo macfb_sysbus_info = {
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.name = TYPE_MACFB,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(MacfbSysBusState),
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.class_init = macfb_sysbus_class_init,
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};
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static TypeInfo macfb_nubus_info = {
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.name = TYPE_NUBUS_MACFB,
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.parent = TYPE_NUBUS_DEVICE,
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.instance_size = sizeof(MacfbNubusState),
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.class_init = macfb_nubus_class_init,
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.class_size = sizeof(MacfbNubusDeviceClass),
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};
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static void macfb_register_types(void)
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{
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type_register_static(&macfb_sysbus_info);
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type_register_static(&macfb_nubus_info);
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}
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type_init(macfb_register_types)
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