Gerd Hoffmann (kraxel@redhat.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4275
-gerrit
commit 687f11c85e88e090aa1c5d91251c5f6b9e1ff8a5 Author: Gerd Hoffmann kraxel@redhat.com Date: Mon Nov 25 09:59:45 2013 +0100
qemu: add cirrus gfx driver
This patch adds native graphics coverage for the qemu cirrus vga (which is the default gfx card). Modesetting function shameless stolen from the linux kernel's cirrus drm driver.
Boots at 800x600 with 32bpp. 1024x768 @ 24bpp should work too. grub2 showed a dissorted picture in my testing though. 24bpp is rather uncommon these days, probably a small buglet somewhere due to lack of test coverage.
For resolutions higher than 1024x768 I strongly recomment switching to the standard vga (-vga std). The qemu cirrus emulation is limited by the capabilities real cirrus cards had last century ...
Change-Id: I6dd9f05d565af7b40fa9ce14139526b58863a191 Signed-off-by: Gerd Hoffmann kraxel@redhat.com --- src/drivers/emulation/qemu/Kconfig | 8 + src/drivers/emulation/qemu/Makefile.inc | 1 + src/drivers/emulation/qemu/cirrus.c | 304 ++++++++++++++++++++++++++++++++ src/drivers/emulation/qemu/cirrusregs.h | 93 ++++++++++ src/drivers/emulation/qemu/vgaregs.h | 139 +++++++++++++++ 5 files changed, 545 insertions(+)
diff --git a/src/drivers/emulation/qemu/Kconfig b/src/drivers/emulation/qemu/Kconfig index 56fdaca..f6eec2f 100644 --- a/src/drivers/emulation/qemu/Kconfig +++ b/src/drivers/emulation/qemu/Kconfig @@ -10,6 +10,14 @@ config DRIVERS_EMULATION_QEMU_BOCHS vga (cirrus) is *not* supported, so you have to pick another one explicitly via 'qemu -vga $card'.
+config DRIVERS_EMULATION_QEMU_CIRRUS + bool "cirrus vga driver" + default y + depends on BOARD_EMULATION_QEMU_X86 + depends on MAINBOARD_DO_NATIVE_VGA_INIT + help + VGA driver for qemu emulated cirrus vga card. + config DRIVERS_EMULATION_QEMU_BOCHS_XRES int "bochs vga xres" default 800 diff --git a/src/drivers/emulation/qemu/Makefile.inc b/src/drivers/emulation/qemu/Makefile.inc index 77b8c74..7bb78d4 100644 --- a/src/drivers/emulation/qemu/Makefile.inc +++ b/src/drivers/emulation/qemu/Makefile.inc @@ -1 +1,2 @@ ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += bochs.c +ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_CIRRUS) += cirrus.c diff --git a/src/drivers/emulation/qemu/cirrus.c b/src/drivers/emulation/qemu/cirrus.c new file mode 100644 index 0000000..1769edd --- /dev/null +++ b/src/drivers/emulation/qemu/cirrus.c @@ -0,0 +1,304 @@ +#include <stdint.h> +#include <delay.h> +#include <edid.h> +#include <stdlib.h> +#include <string.h> +#include <arch/io.h> + +#include <boot/coreboot_tables.h> +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <device/pci_ops.h> + +#include "vgaregs.h" +#include "cirrusregs.h" + +#define RREG8(reg) read8((mmio) + (reg)) +#define WREG8(reg, v) write8((mmio) + (reg), v) + +#define SEQ_INDEX 4 +#define SEQ_DATA 5 + +#define WREG_SEQ(reg, v) \ + do { \ + WREG8(SEQ_INDEX, reg); \ + WREG8(SEQ_DATA, v); \ + } while (0) \ + +#define CRT_INDEX 0x14 +#define CRT_DATA 0x15 + +#define WREG_CRT(reg, v) \ + do { \ + WREG8(CRT_INDEX, reg); \ + WREG8(CRT_DATA, v); \ + } while (0) \ + +#define GFX_INDEX 0xe +#define GFX_DATA 0xf + +#define WREG_GFX(reg, v) \ + do { \ + WREG8(GFX_INDEX, reg); \ + WREG8(GFX_DATA, v); \ + } while (0) \ + +/* + * Cirrus has a "hidden" DAC register that can be accessed by writing to + * the pixel mask register to reset the state, then reading from the register + * four times. The next write will then pass to the DAC + */ +#define VGA_DAC_MASK 0x6 + +#define WREG_HDR(v) \ + do { \ + RREG8(VGA_DAC_MASK); \ + RREG8(VGA_DAC_MASK); \ + RREG8(VGA_DAC_MASK); \ + RREG8(VGA_DAC_MASK); \ + WREG8(VGA_DAC_MASK, v); \ + } while (0) \ + +struct drm_display_mode { + char name[32]; + + /* Proposed mode values */ + int clock; /* in kHz */ + int hdisplay; + int hsync_start; + int hsync_end; + int htotal; + int hskew; + int vdisplay; + int vsync_start; + int vsync_end; + int vtotal; + int vscan; +}; + +#define DRM_MODE(nm, c, hd, hss, hse, ht, hsk, vd, vss, vse, vt, vs) \ + .name = nm, .clock = (c), \ + .hdisplay = (hd), .hsync_start = (hss), .hsync_end = (hse), \ + .htotal = (ht), .hskew = (hsk), .vdisplay = (vd), \ + .vsync_start = (vss), .vsync_end = (vse), .vtotal = (vt), \ + .vscan = (vs), \ + +static const struct drm_display_mode mode_640_480 = { + /* 640x480@60Hz */ + DRM_MODE("640x480", 25175, 640, 656, + 752, 800, 0, 480, 489, 492, 525, 0) +}; +static const struct drm_display_mode mode_800_600 = { + /* 800x600@60Hz */ + DRM_MODE("800x600", 40000, 800, 840, + 968, 1056, 0, 600, 601, 605, 628, 0) +}; +static const struct drm_display_mode mode_1024_768 = { + /* 1024x768@60Hz */ + DRM_MODE("1024x768", 65000, 1024, 1048, + 1184, 1344, 0, 768, 771, 777, 806, 0) +}; + +static void cirrus_set_start_address(u32 mmio, unsigned offset) +{ + u32 addr; + u8 tmp; + + addr = offset >> 2; + WREG_CRT(0x0c, (u8)((addr >> 8) & 0xff)); + WREG_CRT(0x0d, (u8)(addr & 0xff)); + + WREG8(CRT_INDEX, 0x1b); + tmp = RREG8(CRT_DATA); + tmp &= 0xf2; + tmp |= (addr >> 16) & 0x01; + tmp |= (addr >> 15) & 0x0c; + WREG_CRT(0x1b, tmp); + WREG8(CRT_INDEX, 0x1d); + tmp = RREG8(CRT_DATA); + tmp &= 0x7f; + tmp |= (addr >> 12) & 0x80; + WREG_CRT(0x1d, tmp); +} + +/* + * The meat of this driver. The core passes us a mode and we have to program + * it. The modesetting here is the bare minimum required to satisfy the qemu + * emulation of this hardware, and running this against a real device is + * likely to result in an inadequately programmed mode. We've already had + * the opportunity to modify the mode, so whatever we receive here should + * be something that can be correctly programmed and displayed + */ +static int cirrus_crtc_mode_set(u32 mmio, int bits_per_pixel, + const struct drm_display_mode *mode) +{ + int hsyncstart, hsyncend, htotal, hdispend; + int vtotal, vdispend; + int pitch, tmp; + int sr07 = 0, hdr = 0; + + WREG8(VGA_MIS_W - 0x3c0, VGA_MIS_COLOR); + + htotal = mode->htotal / 8; + hsyncend = mode->hsync_end / 8; + hsyncstart = mode->hsync_start / 8; + hdispend = mode->hdisplay / 8; + + vtotal = mode->vtotal; + vdispend = mode->vdisplay; + + vdispend -= 1; + vtotal -= 2; + + htotal -= 5; + hdispend -= 1; + hsyncstart += 1; + hsyncend += 1; + + WREG_CRT(VGA_CRTC_V_SYNC_END, 0x20); + WREG_CRT(VGA_CRTC_H_TOTAL, htotal); + WREG_CRT(VGA_CRTC_H_DISP, hdispend); + WREG_CRT(VGA_CRTC_H_SYNC_START, hsyncstart); + WREG_CRT(VGA_CRTC_H_SYNC_END, hsyncend); + WREG_CRT(VGA_CRTC_V_TOTAL, vtotal & 0xff); + WREG_CRT(VGA_CRTC_V_DISP_END, vdispend & 0xff); + + tmp = 0x40; + if ((vdispend + 1) & 512) + tmp |= 0x20; + WREG_CRT(VGA_CRTC_MAX_SCAN, tmp); + + /* + * Overflow bits for values that don't fit in the standard registers + */ + tmp = 16; + if (vtotal & 256) + tmp |= 1; + if (vdispend & 256) + tmp |= 2; + if ((vdispend + 1) & 256) + tmp |= 8; + if (vtotal & 512) + tmp |= 32; + if (vdispend & 512) + tmp |= 64; + WREG_CRT(VGA_CRTC_OVERFLOW, tmp); + + tmp = 0; + + /* More overflow bits */ + + if ((htotal + 5) & 64) + tmp |= 16; + if ((htotal + 5) & 128) + tmp |= 32; + if (vtotal & 256) + tmp |= 64; + if (vtotal & 512) + tmp |= 128; + + WREG_CRT(CL_CRT1A, tmp); + + /* Disable Hercules/CGA compatibility */ + WREG_CRT(VGA_CRTC_MODE, 0x03); + + WREG8(SEQ_INDEX, 0x7); + sr07 = RREG8(SEQ_DATA); + sr07 &= 0xe0; + hdr = 0; + switch (bits_per_pixel) { + case 8: + sr07 |= 0x11; + break; + case 16: + sr07 |= 0xc1; + hdr = 0xc0; + break; + case 24: + sr07 |= 0x15; + hdr = 0xc5; + break; + case 32: + sr07 |= 0x19; + hdr = 0xc5; + break; + default: + return -1; + } + + WREG_SEQ(0x7, sr07); + + /* Program the pitch */ + pitch = mode->hdisplay * ((bits_per_pixel + 7) / 8); + tmp = pitch / 8; + WREG_CRT(VGA_CRTC_OFFSET, tmp); + + /* Enable extended blanking and pitch bits, and enable full memory */ + tmp = 0x22; + tmp |= (pitch >> 7) & 0x10; + tmp |= (pitch >> 6) & 0x40; + WREG_CRT(0x1b, tmp); + + /* Enable high-colour modes */ + WREG_GFX(VGA_GFX_MODE, 0x40); + + /* And set graphics mode */ + WREG_GFX(VGA_GFX_MISC, 0x01); + + WREG_HDR(hdr); + + WREG8(0, 0x20); /* disable blanking */ + cirrus_set_start_address(mmio, 0); + return 0; +} + +static void qemu_cirrus_init(device_t dev) +{ + const struct drm_display_mode *mode; + int bits_per_pixel; + struct edid edid; + u32 addr; + u32 mmio; + + /* find lfb pci bar */ + addr = pci_read_config32(dev, PCI_BASE_ADDRESS_0); + addr &= ~PCI_BASE_ADDRESS_MEM_ATTR_MASK; + if (!addr) + return; + + /* find mmio pci bar */ + mmio = pci_read_config32(dev, PCI_BASE_ADDRESS_1); + mmio &= ~PCI_BASE_ADDRESS_MEM_ATTR_MASK; + if (!mmio) + return; + + printk(BIOS_DEBUG, "QEMU VGA: cirrus, lfb @ 0x%x, mmio @ 0x%x\n", + addr, mmio); + + /* initialize mode */ + bits_per_pixel = 32; + mode = &mode_800_600; + cirrus_crtc_mode_set(mmio, bits_per_pixel, mode); + + /* setup coreboot framebuffer */ + edid.ha = mode->hdisplay; + edid.va = mode->vdisplay; + edid.bpp = bits_per_pixel; + set_vbe_mode_info_valid(&edid, addr); +} + +static struct device_operations qemu_cirrus_graph_ops = { + .read_resources = pci_dev_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_dev_enable_resources, + .init = qemu_cirrus_init, + .scan_bus = 0, +}; + +static const struct pci_driver qemu_cirrus_driver __pci_driver = { + .ops = &qemu_cirrus_graph_ops, + .vendor = 0x1013, + .device = 0x00b8, +}; diff --git a/src/drivers/emulation/qemu/cirrusregs.h b/src/drivers/emulation/qemu/cirrusregs.h new file mode 100644 index 0000000..44989d0 --- /dev/null +++ b/src/drivers/emulation/qemu/cirrusregs.h @@ -0,0 +1,93 @@ +/*** External/General Registers ***/ +#define CL_POS102 0x102 /* POS102 register */ +#define CL_VSSM 0x46e8 /* Adapter Sleep */ +#define CL_VSSM2 0x3c3 /* Motherboard Sleep */ + +/*** VGA Sequencer Registers ***/ +/* the following are from the "extension registers" group */ +#define CL_SEQR6 0x6 /* Unlock ALL Extensions */ +#define CL_SEQR7 0x7 /* Extended Sequencer Mode */ +#define CL_SEQR8 0x8 /* EEPROM Control */ +#define CL_SEQR9 0x9 /* Scratch Pad 0 (do not access!) */ +#define CL_SEQRA 0xa /* Scratch Pad 1 (do not access!) */ +#define CL_SEQRB 0xb /* VCLK0 Numerator */ +#define CL_SEQRC 0xc /* VCLK1 Numerator */ +#define CL_SEQRD 0xd /* VCLK2 Numerator */ +#define CL_SEQRE 0xe /* VCLK3 Numerator */ +#define CL_SEQRF 0xf /* DRAM Control */ +#define CL_SEQR10 0x10 /* Graphics Cursor X Position */ +#define CL_SEQR11 0x11 /* Graphics Cursor Y Position */ +#define CL_SEQR12 0x12 /* Graphics Cursor Attributes */ +#define CL_SEQR13 0x13 /* Graphics Cursor Pattern Address Offset */ +#define CL_SEQR14 0x14 /* Scratch Pad 2 (CL-GD5426/'28 Only) (do not access!) */ +#define CL_SEQR15 0x15 /* Scratch Pad 3 (CL-GD5426/'28 Only) (do not access!) */ +#define CL_SEQR16 0x16 /* Performance Tuning (CL-GD5424/'26/'28 Only) */ +#define CL_SEQR17 0x17 /* Configuration ReadBack and Extended Control (CL-GF5428 Only) */ +#define CL_SEQR18 0x18 /* Signature Generator Control (Not CL-GD5420) */ +#define CL_SEQR19 0x19 /* Signature Generator Result Low Byte (Not CL-GD5420) */ +#define CL_SEQR1A 0x1a /* Signature Generator Result High Byte (Not CL-GD5420) */ +#define CL_SEQR1B 0x1b /* VCLK0 Denominator and Post-Scalar Value */ +#define CL_SEQR1C 0x1c /* VCLK1 Denominator and Post-Scalar Value */ +#define CL_SEQR1D 0x1d /* VCLK2 Denominator and Post-Scalar Value */ +#define CL_SEQR1E 0x1e /* VCLK3 Denominator and Post-Scalar Value */ +#define CL_SEQR1F 0x1f /* BIOS ROM write enable and MCLK Select */ + +/*** CRT Controller Registers ***/ +#define CL_CRT22 0x22 /* Graphics Data Latches ReadBack */ +#define CL_CRT24 0x24 /* Attribute Controller Toggle ReadBack */ +#define CL_CRT26 0x26 /* Attribute Controller Index ReadBack */ +/* the following are from the "extension registers" group */ +#define CL_CRT19 0x19 /* Interlace End */ +#define CL_CRT1A 0x1a /* Interlace Control */ +#define CL_CRT1B 0x1b /* Extended Display Controls */ +#define CL_CRT1C 0x1c /* Sync adjust and genlock register */ +#define CL_CRT1D 0x1d /* Overlay Extended Control register */ +#define CL_CRT1E 0x1e /* Another overflow register */ +#define CL_CRT25 0x25 /* Part Status Register */ +#define CL_CRT27 0x27 /* ID Register */ +#define CL_CRT51 0x51 /* P4 disable "flicker fixer" */ + +/*** Graphics Controller Registers ***/ +/* the following are from the "extension registers" group */ +#define CL_GR9 0x9 /* Offset Register 0 */ +#define CL_GRA 0xa /* Offset Register 1 */ +#define CL_GRB 0xb /* Graphics Controller Mode Extensions */ +#define CL_GRC 0xc /* Color Key (CL-GD5424/'26/'28 Only) */ +#define CL_GRD 0xd /* Color Key Mask (CL-GD5424/'26/'28 Only) */ +#define CL_GRE 0xe /* Miscellaneous Control (Cl-GD5428 Only) */ +#define CL_GRF 0xf /* Display Compression Control register */ +#define CL_GR10 0x10 /* 16-bit Pixel BG Color High Byte (Not CL-GD5420) */ +#define CL_GR11 0x11 /* 16-bit Pixel FG Color High Byte (Not CL-GD5420) */ +#define CL_GR12 0x12 /* Background Color Byte 2 Register */ +#define CL_GR13 0x13 /* Foreground Color Byte 2 Register */ +#define CL_GR14 0x14 /* Background Color Byte 3 Register */ +#define CL_GR15 0x15 /* Foreground Color Byte 3 Register */ +/* the following are CL-GD5426/'28 specific blitter registers */ +#define CL_GR20 0x20 /* BLT Width Low */ +#define CL_GR21 0x21 /* BLT Width High */ +#define CL_GR22 0x22 /* BLT Height Low */ +#define CL_GR23 0x23 /* BLT Height High */ +#define CL_GR24 0x24 /* BLT Destination Pitch Low */ +#define CL_GR25 0x25 /* BLT Destination Pitch High */ +#define CL_GR26 0x26 /* BLT Source Pitch Low */ +#define CL_GR27 0x27 /* BLT Source Pitch High */ +#define CL_GR28 0x28 /* BLT Destination Start Low */ +#define CL_GR29 0x29 /* BLT Destination Start Mid */ +#define CL_GR2A 0x2a /* BLT Destination Start High */ +#define CL_GR2C 0x2c /* BLT Source Start Low */ +#define CL_GR2D 0x2d /* BLT Source Start Mid */ +#define CL_GR2E 0x2e /* BLT Source Start High */ +#define CL_GR2F 0x2f /* Picasso IV Blitter compat mode..? */ +#define CL_GR30 0x30 /* BLT Mode */ +#define CL_GR31 0x31 /* BLT Start/Status */ +#define CL_GR32 0x32 /* BLT Raster Operation */ +#define CL_GR33 0x33 /* another P4 "compat" register.. */ +#define CL_GR34 0x34 /* Transparent Color Select Low */ +#define CL_GR35 0x35 /* Transparent Color Select High */ +#define CL_GR38 0x38 /* Source Transparent Color Mask Low */ +#define CL_GR39 0x39 /* Source Transparent Color Mask High */ + +/*** Attribute Controller Registers ***/ +#define CL_AR33 0x33 /* The "real" Pixel Panning register (?) */ +#define CL_AR34 0x34 /* TEST */ + diff --git a/src/drivers/emulation/qemu/vgaregs.h b/src/drivers/emulation/qemu/vgaregs.h new file mode 100644 index 0000000..5ab8241 --- /dev/null +++ b/src/drivers/emulation/qemu/vgaregs.h @@ -0,0 +1,139 @@ +/* Some of the code below is taken from SVGAlib. The original, + unmodified copyright notice for that code is below. */ +/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */ +/* */ +/* This library is free software; you can redistribute it and/or */ +/* modify it without any restrictions. This library is distributed */ +/* in the hope that it will be useful, but without any warranty. */ + +/* Multi-chipset support Copyright 1993 Harm Hanemaayer */ +/* partially copyrighted (C) 1993 by Hartmut Schirmer */ + +/* VGA data register ports */ +#define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */ +#define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */ +#define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */ +#define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */ +#define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */ +#define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */ +#define VGA_MIS_R 0x3CC /* Misc Output Read Register */ +#define VGA_MIS_W 0x3C2 /* Misc Output Write Register */ +#define VGA_FTC_R 0x3CA /* Feature Control Read Register */ +#define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */ +#define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */ +#define VGA_PEL_D 0x3C9 /* PEL Data Register */ +#define VGA_PEL_MSK 0x3C6 /* PEL mask register */ + +/* EGA-specific registers */ +#define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */ +#define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */ + +/* VGA index register ports */ +#define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */ +#define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */ +#define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */ +#define VGA_GFX_I 0x3CE /* Graphics Controller Index */ +#define VGA_SEQ_I 0x3C4 /* Sequencer Index */ +#define VGA_PEL_IW 0x3C8 /* PEL Write Index */ +#define VGA_PEL_IR 0x3C7 /* PEL Read Index */ + +/* standard VGA indexes max counts */ +#define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */ +#define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */ +#define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */ +#define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */ +#define VGA_MIS_C 0x01 /* Number of Misc Output Register */ + +/* VGA misc register bit masks */ +#define VGA_MIS_COLOR 0x01 +#define VGA_MIS_ENB_MEM_ACCESS 0x02 +#define VGA_MIS_DCLK_28322_720 0x04 +#define VGA_MIS_ENB_PLL_LOAD (0x04 | 0x08) +#define VGA_MIS_SEL_HIGH_PAGE 0x20 + +/* VGA CRT controller register indices */ +#define VGA_CRTC_H_TOTAL 0 +#define VGA_CRTC_H_DISP 1 +#define VGA_CRTC_H_BLANK_START 2 +#define VGA_CRTC_H_BLANK_END 3 +#define VGA_CRTC_H_SYNC_START 4 +#define VGA_CRTC_H_SYNC_END 5 +#define VGA_CRTC_V_TOTAL 6 +#define VGA_CRTC_OVERFLOW 7 +#define VGA_CRTC_PRESET_ROW 8 +#define VGA_CRTC_MAX_SCAN 9 +#define VGA_CRTC_CURSOR_START 0x0A +#define VGA_CRTC_CURSOR_END 0x0B +#define VGA_CRTC_START_HI 0x0C +#define VGA_CRTC_START_LO 0x0D +#define VGA_CRTC_CURSOR_HI 0x0E +#define VGA_CRTC_CURSOR_LO 0x0F +#define VGA_CRTC_V_SYNC_START 0x10 +#define VGA_CRTC_V_SYNC_END 0x11 +#define VGA_CRTC_V_DISP_END 0x12 +#define VGA_CRTC_OFFSET 0x13 +#define VGA_CRTC_UNDERLINE 0x14 +#define VGA_CRTC_V_BLANK_START 0x15 +#define VGA_CRTC_V_BLANK_END 0x16 +#define VGA_CRTC_MODE 0x17 +#define VGA_CRTC_LINE_COMPARE 0x18 +#define VGA_CRTC_REGS VGA_CRT_C + +/* VGA CRT controller bit masks */ +#define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */ +#define VGA_CR17_H_V_SIGNALS_ENABLED 0x80 + +/* VGA attribute controller register indices */ +#define VGA_ATC_PALETTE0 0x00 +#define VGA_ATC_PALETTE1 0x01 +#define VGA_ATC_PALETTE2 0x02 +#define VGA_ATC_PALETTE3 0x03 +#define VGA_ATC_PALETTE4 0x04 +#define VGA_ATC_PALETTE5 0x05 +#define VGA_ATC_PALETTE6 0x06 +#define VGA_ATC_PALETTE7 0x07 +#define VGA_ATC_PALETTE8 0x08 +#define VGA_ATC_PALETTE9 0x09 +#define VGA_ATC_PALETTEA 0x0A +#define VGA_ATC_PALETTEB 0x0B +#define VGA_ATC_PALETTEC 0x0C +#define VGA_ATC_PALETTED 0x0D +#define VGA_ATC_PALETTEE 0x0E +#define VGA_ATC_PALETTEF 0x0F +#define VGA_ATC_MODE 0x10 +#define VGA_ATC_OVERSCAN 0x11 +#define VGA_ATC_PLANE_ENABLE 0x12 +#define VGA_ATC_PEL 0x13 +#define VGA_ATC_COLOR_PAGE 0x14 + +#define VGA_AR_ENABLE_DISPLAY 0x20 + +/* VGA sequencer register indices */ +#define VGA_SEQ_RESET 0x00 +#define VGA_SEQ_CLOCK_MODE 0x01 +#define VGA_SEQ_PLANE_WRITE 0x02 +#define VGA_SEQ_CHARACTER_MAP 0x03 +#define VGA_SEQ_MEMORY_MODE 0x04 + +/* VGA sequencer register bit masks */ +#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */ +#define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */ +#define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */ +#define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */ +#define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */ +#define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */ + +/* VGA graphics controller register indices */ +#define VGA_GFX_SR_VALUE 0x00 +#define VGA_GFX_SR_ENABLE 0x01 +#define VGA_GFX_COMPARE_VALUE 0x02 +#define VGA_GFX_DATA_ROTATE 0x03 +#define VGA_GFX_PLANE_READ 0x04 +#define VGA_GFX_MODE 0x05 +#define VGA_GFX_MISC 0x06 +#define VGA_GFX_COMPARE_MASK 0x07 +#define VGA_GFX_BIT_MASK 0x08 + +/* VGA graphics controller bit masks */ +#define VGA_GR06_GRAPHICS_MODE 0x01 +