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qemu / qemu / d444e5673c223241bd2edbc207b02cc1b2114b71 / . / hw / display / vga.c
blob: 892fedc8dcef26d33baa131e7b839cdca9cd616a [file] [log] [blame]
/*
* QEMU VGA Emulator.
*
* Copyright (c) 2003 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "sysemu/reset.h"
#include "qapi/error.h"
#include "exec/tswap.h"
#include "hw/display/vga.h"
#include "hw/i386/x86.h"
#include "hw/pci/pci.h"
#include "vga_int.h"
#include "vga_regs.h"
#include "ui/pixel_ops.h"
#include "ui/console.h"
#include "qemu/timer.h"
#include "hw/xen/xen.h"
#include "migration/vmstate.h"
#include "trace.h"
//#define DEBUG_VGA_MEM
//#define DEBUG_VGA_REG
bool have_vga = true;
/* 16 state changes per vertical frame @60 Hz */
#define VGA_TEXT_CURSOR_PERIOD_MS (1000 * 2 * 16 / 60)
/* Address mask for non-VESA modes. */
#define VGA_VRAM_SIZE (256 * KiB)
/* This value corresponds to a shift of zero pixels
* in 9-dot text mode. In other modes, bit 3 is undefined;
* we just ignore it, so that 8 corresponds to zero pixels
* in all modes.
*/
#define VGA_HPEL_NEUTRAL 8
/*
* Video Graphics Array (VGA)
*
* Chipset docs for original IBM VGA:
* http://www.mcamafia.de/pdf/ibm_vgaxga_trm2.pdf
*
* FreeVGA site:
* http://www.osdever.net/FreeVGA/home.htm
*
* Standard VGA features and Bochs VBE extensions are implemented.
*/
/* force some bits to zero */
const uint8_t sr_mask[8] = {
0x03,
0x3d,
0x0f,
0x3f,
0x0e,
0x00,
0x00,
0xff,
};
const uint8_t gr_mask[16] = {
0x0f, /* 0x00 */
0x0f, /* 0x01 */
0x0f, /* 0x02 */
0x1f, /* 0x03 */
0x03, /* 0x04 */
0x7b, /* 0x05 */
0x0f, /* 0x06 */
0x0f, /* 0x07 */
0xff, /* 0x08 */
0x00, /* 0x09 */
0x00, /* 0x0a */
0x00, /* 0x0b */
0x00, /* 0x0c */
0x00, /* 0x0d */
0x00, /* 0x0e */
0x00, /* 0x0f */
};
#define GET_PLANE(data, p) ((cpu_to_le32(data) >> ((p) * 8)) & 0xff)
static const uint32_t mask16[16] = {
const_le32(0x00000000),
const_le32(0x000000ff),
const_le32(0x0000ff00),
const_le32(0x0000ffff),
const_le32(0x00ff0000),
const_le32(0x00ff00ff),
const_le32(0x00ffff00),
const_le32(0x00ffffff),
const_le32(0xff000000),
const_le32(0xff0000ff),
const_le32(0xff00ff00),
const_le32(0xff00ffff),
const_le32(0xffff0000),
const_le32(0xffff00ff),
const_le32(0xffffff00),
const_le32(0xffffffff),
};
static uint32_t expand4[256];
static uint16_t expand2[256];
static uint8_t expand4to8[16];
static void vbe_update_vgaregs(VGACommonState *s);
static inline bool vbe_enabled(VGACommonState *s)
{
return s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED;
}
static inline uint8_t sr(VGACommonState *s, int idx)
{
return vbe_enabled(s) ? s->sr_vbe[idx] : s->sr[idx];
}
static void vga_update_memory_access(VGACommonState *s)
{
hwaddr base, offset, size;
if (s->legacy_address_space == NULL) {
return;
}
if (s->has_chain4_alias) {
memory_region_del_subregion(s->legacy_address_space, &s->chain4_alias);
object_unparent(OBJECT(&s->chain4_alias));
s->has_chain4_alias = false;
s->plane_updated = 0xf;
}
if ((sr(s, VGA_SEQ_PLANE_WRITE) & VGA_SR02_ALL_PLANES) ==
VGA_SR02_ALL_PLANES && sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_CHN_4M) {
offset = 0;
switch ((s->gr[VGA_GFX_MISC] >> 2) & 3) {
case 0:
base = 0xa0000;
size = 0x20000;
break;
case 1:
base = 0xa0000;
size = 0x10000;
offset = s->bank_offset;
break;
case 2:
base = 0xb0000;
size = 0x8000;
break;
case 3:
default:
base = 0xb8000;
size = 0x8000;
break;
}
assert(offset + size <= s->vram_size);
memory_region_init_alias(&s->chain4_alias, memory_region_owner(&s->vram),
"vga.chain4", &s->vram, offset, size);
memory_region_add_subregion_overlap(s->legacy_address_space, base,
&s->chain4_alias, 2);
s->has_chain4_alias = true;
}
}
static void vga_dumb_update_retrace_info(VGACommonState *s)
{
(void) s;
}
static void vga_precise_update_retrace_info(VGACommonState *s)
{
int htotal_chars;
int hretr_start_char;
int hretr_skew_chars;
int hretr_end_char;
int vtotal_lines;
int vretr_start_line;
int vretr_end_line;
int dots;
#if 0
int div2, sldiv2;
#endif
int clocking_mode;
int clock_sel;
const int clk_hz[] = {25175000, 28322000, 25175000, 25175000};
int64_t chars_per_sec;
struct vga_precise_retrace *r = &s->retrace_info.precise;
htotal_chars = s->cr[VGA_CRTC_H_TOTAL] + 5;
hretr_start_char = s->cr[VGA_CRTC_H_SYNC_START];
hretr_skew_chars = (s->cr[VGA_CRTC_H_SYNC_END] >> 5) & 3;
hretr_end_char = s->cr[VGA_CRTC_H_SYNC_END] & 0x1f;
vtotal_lines = (s->cr[VGA_CRTC_V_TOTAL] |
(((s->cr[VGA_CRTC_OVERFLOW] & 1) |
((s->cr[VGA_CRTC_OVERFLOW] >> 4) & 2)) << 8)) + 2;
vretr_start_line = s->cr[VGA_CRTC_V_SYNC_START] |
((((s->cr[VGA_CRTC_OVERFLOW] >> 2) & 1) |
((s->cr[VGA_CRTC_OVERFLOW] >> 6) & 2)) << 8);
vretr_end_line = s->cr[VGA_CRTC_V_SYNC_END] & 0xf;
clocking_mode = (sr(s, VGA_SEQ_CLOCK_MODE) >> 3) & 1;
clock_sel = (s->msr >> 2) & 3;
dots = (s->msr & 1) ? 8 : 9;
chars_per_sec = clk_hz[clock_sel] / dots;
htotal_chars <<= clocking_mode;
r->total_chars = vtotal_lines * htotal_chars;
if (r->freq) {
r->ticks_per_char = NANOSECONDS_PER_SECOND / (r->total_chars * r->freq);
} else {
r->ticks_per_char = NANOSECONDS_PER_SECOND / chars_per_sec;
}
r->vstart = vretr_start_line;
r->vend = r->vstart + vretr_end_line + 1;
r->hstart = hretr_start_char + hretr_skew_chars;
r->hend = r->hstart + hretr_end_char + 1;
r->htotal = htotal_chars;
#if 0
div2 = (s->cr[VGA_CRTC_MODE] >> 2) & 1;
sldiv2 = (s->cr[VGA_CRTC_MODE] >> 3) & 1;
printf (
"hz=%f\n"
"htotal = %d\n"
"hretr_start = %d\n"
"hretr_skew = %d\n"
"hretr_end = %d\n"
"vtotal = %d\n"
"vretr_start = %d\n"
"vretr_end = %d\n"
"div2 = %d sldiv2 = %d\n"
"clocking_mode = %d\n"
"clock_sel = %d %d\n"
"dots = %d\n"
"ticks/char = %" PRId64 "\n"
"\n",
(double) NANOSECONDS_PER_SECOND / (r->ticks_per_char * r->total_chars),
htotal_chars,
hretr_start_char,
hretr_skew_chars,
hretr_end_char,
vtotal_lines,
vretr_start_line,
vretr_end_line,
div2, sldiv2,
clocking_mode,
clock_sel,
clk_hz[clock_sel],
dots,
r->ticks_per_char
);
#endif
}
static uint8_t vga_precise_retrace(VGACommonState *s)
{
struct vga_precise_retrace *r = &s->retrace_info.precise;
uint8_t val = s->st01 & ~(ST01_V_RETRACE | ST01_DISP_ENABLE);
if (r->total_chars) {
int cur_line, cur_line_char, cur_char;
int64_t cur_tick;
cur_tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
cur_char = (cur_tick / r->ticks_per_char) % r->total_chars;
cur_line = cur_char / r->htotal;
if (cur_line >= r->vstart && cur_line <= r->vend) {
val |= ST01_V_RETRACE | ST01_DISP_ENABLE;
} else {
cur_line_char = cur_char % r->htotal;
if (cur_line_char >= r->hstart && cur_line_char <= r->hend) {
val |= ST01_DISP_ENABLE;
}
}
return val;
} else {
return s->st01 ^ (ST01_V_RETRACE | ST01_DISP_ENABLE);
}
}
static uint8_t vga_dumb_retrace(VGACommonState *s)
{
return s->st01 ^ (ST01_V_RETRACE | ST01_DISP_ENABLE);
}
int vga_ioport_invalid(VGACommonState *s, uint32_t addr)
{
if (s->msr & VGA_MIS_COLOR) {
/* Color */
return (addr >= 0x3b0 && addr <= 0x3bf);
} else {
/* Monochrome */
return (addr >= 0x3d0 && addr <= 0x3df);
}
}
uint32_t vga_ioport_read(void *opaque, uint32_t addr)
{
VGACommonState *s = opaque;
int val, index;
if (vga_ioport_invalid(s, addr)) {
val = 0xff;
} else {
switch(addr) {
case VGA_ATT_W:
if (s->ar_flip_flop == 0) {
val = s->ar_index;
} else {
val = 0;
}
break;
case VGA_ATT_R:
index = s->ar_index & 0x1f;
if (index < VGA_ATT_C) {
val = s->ar[index];
} else {
val = 0;
}
break;
case VGA_MIS_W:
val = s->st00;
break;
case VGA_SEQ_I:
val = s->sr_index;
break;
case VGA_SEQ_D:
val = s->sr[s->sr_index];
#ifdef DEBUG_VGA_REG
printf("vga: read SR%x = 0x%02x\n", s->sr_index, val);
#endif
break;
case VGA_PEL_IR:
val = s->dac_state;
break;
case VGA_PEL_IW:
val = s->dac_write_index;
break;
case VGA_PEL_D:
val = s->palette[s->dac_read_index * 3 + s->dac_sub_index];
if (++s->dac_sub_index == 3) {
s->dac_sub_index = 0;
s->dac_read_index++;
}
break;
case VGA_FTC_R:
val = s->fcr;
break;
case VGA_MIS_R:
val = s->msr;
break;
case VGA_GFX_I:
val = s->gr_index;
break;
case VGA_GFX_D:
val = s->gr[s->gr_index];
#ifdef DEBUG_VGA_REG
printf("vga: read GR%x = 0x%02x\n", s->gr_index, val);
#endif
break;
case VGA_CRT_IM:
case VGA_CRT_IC:
val = s->cr_index;
break;
case VGA_CRT_DM:
case VGA_CRT_DC:
val = s->cr[s->cr_index];
#ifdef DEBUG_VGA_REG
printf("vga: read CR%x = 0x%02x\n", s->cr_index, val);
#endif
break;
case VGA_IS1_RM:
case VGA_IS1_RC:
/* just toggle to fool polling */
val = s->st01 = s->retrace(s);
s->ar_flip_flop = 0;
break;
default:
val = 0x00;
break;
}
}
trace_vga_std_read_io(addr, val);
return val;
}
void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
VGACommonState *s = opaque;
int index;
/* check port range access depending on color/monochrome mode */
if (vga_ioport_invalid(s, addr)) {
return;
}
trace_vga_std_write_io(addr, val);
switch(addr) {
case VGA_ATT_W:
if (s->ar_flip_flop == 0) {
val &= 0x3f;
s->ar_index = val;
} else {
index = s->ar_index & 0x1f;
switch(index) {
case VGA_ATC_PALETTE0 ... VGA_ATC_PALETTEF:
s->ar[index] = val & 0x3f;
break;
case VGA_ATC_MODE:
s->ar[index] = val & ~0x10;
break;
case VGA_ATC_OVERSCAN:
s->ar[index] = val;
break;
case VGA_ATC_PLANE_ENABLE:
s->ar[index] = val & ~0xc0;
break;
case VGA_ATC_PEL:
s->ar[index] = val & ~0xf0;
break;
case VGA_ATC_COLOR_PAGE:
s->ar[index] = val & ~0xf0;
break;
default:
break;
}
}
s->ar_flip_flop ^= 1;
break;
case VGA_MIS_W:
s->msr = val & ~0x10;
s->update_retrace_info(s);
break;
case VGA_SEQ_I:
s->sr_index = val & 7;
break;
case VGA_SEQ_D:
#ifdef DEBUG_VGA_REG
printf("vga: write SR%x = 0x%02x\n", s->sr_index, val);
#endif
s->sr[s->sr_index] = val & sr_mask[s->sr_index];
if (s->sr_index == VGA_SEQ_CLOCK_MODE) {
s->update_retrace_info(s);
}
vga_update_memory_access(s);
break;
case VGA_PEL_IR:
s->dac_read_index = val;
s->dac_sub_index = 0;
s->dac_state = 3;
break;
case VGA_PEL_IW:
s->dac_write_index = val;
s->dac_sub_index = 0;
s->dac_state = 0;
break;
case VGA_PEL_D:
s->dac_cache[s->dac_sub_index] = val;
if (++s->dac_sub_index == 3) {
memcpy(&s->palette[s->dac_write_index * 3], s->dac_cache, 3);
s->dac_sub_index = 0;
s->dac_write_index++;
}
break;
case VGA_GFX_I:
s->gr_index = val & 0x0f;
break;
case VGA_GFX_D:
#ifdef DEBUG_VGA_REG
printf("vga: write GR%x = 0x%02x\n", s->gr_index, val);
#endif
s->gr[s->gr_index] = val & gr_mask[s->gr_index];
vbe_update_vgaregs(s);
vga_update_memory_access(s);
break;
case VGA_CRT_IM:
case VGA_CRT_IC:
s->cr_index = val;
break;
case VGA_CRT_DM:
case VGA_CRT_DC:
#ifdef DEBUG_VGA_REG
printf("vga: write CR%x = 0x%02x\n", s->cr_index, val);
#endif
/* handle CR0-7 protection */
if ((s->cr[VGA_CRTC_V_SYNC_END] & VGA_CR11_LOCK_CR0_CR7) &&
s->cr_index <= VGA_CRTC_OVERFLOW) {
/* can always write bit 4 of CR7 */
if (s->cr_index == VGA_CRTC_OVERFLOW) {
s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x10) |
(val & 0x10);
vbe_update_vgaregs(s);
}
return;
}
s->cr[s->cr_index] = val;
vbe_update_vgaregs(s);
switch(s->cr_index) {
case VGA_CRTC_H_TOTAL:
case VGA_CRTC_H_SYNC_START:
case VGA_CRTC_H_SYNC_END:
case VGA_CRTC_V_TOTAL:
case VGA_CRTC_OVERFLOW:
case VGA_CRTC_V_SYNC_END:
case VGA_CRTC_MODE:
s->update_retrace_info(s);
break;
}
break;
case VGA_IS1_RM:
case VGA_IS1_RC:
s->fcr = val & 0x10;
break;
}
}
/*
* Sanity check vbe register writes.
*
* As we don't have a way to signal errors to the guest in the bochs
* dispi interface we'll go adjust the registers to the closest valid
* value.
*/
static void vbe_fixup_regs(VGACommonState *s)
{
uint16_t *r = s->vbe_regs;
uint32_t bits, linelength, maxy, offset;
if (!vbe_enabled(s)) {
/* vbe is turned off -- nothing to do */
return;
}
/* check depth */
switch (r[VBE_DISPI_INDEX_BPP]) {
case 4:
case 8:
case 16:
case 24:
case 32:
bits = r[VBE_DISPI_INDEX_BPP];
break;
case 15:
bits = 16;
break;
default:
bits = r[VBE_DISPI_INDEX_BPP] = 8;
break;
}
/* check width */
r[VBE_DISPI_INDEX_XRES] &= ~7u;
if (r[VBE_DISPI_INDEX_XRES] == 0) {
r[VBE_DISPI_INDEX_XRES] = 8;
}
if (r[VBE_DISPI_INDEX_XRES] > VBE_DISPI_MAX_XRES) {
r[VBE_DISPI_INDEX_XRES] = VBE_DISPI_MAX_XRES;
}
r[VBE_DISPI_INDEX_VIRT_WIDTH] &= ~7u;
if (r[VBE_DISPI_INDEX_VIRT_WIDTH] > VBE_DISPI_MAX_XRES) {
r[VBE_DISPI_INDEX_VIRT_WIDTH] = VBE_DISPI_MAX_XRES;
}
if (r[VBE_DISPI_INDEX_VIRT_WIDTH] < r[VBE_DISPI_INDEX_XRES]) {
r[VBE_DISPI_INDEX_VIRT_WIDTH] = r[VBE_DISPI_INDEX_XRES];
}
/* check height */
linelength = r[VBE_DISPI_INDEX_VIRT_WIDTH] * bits / 8;
maxy = s->vbe_size / linelength;
if (r[VBE_DISPI_INDEX_YRES] == 0) {
r[VBE_DISPI_INDEX_YRES] = 1;
}
if (r[VBE_DISPI_INDEX_YRES] > VBE_DISPI_MAX_YRES) {
r[VBE_DISPI_INDEX_YRES] = VBE_DISPI_MAX_YRES;
}
if (r[VBE_DISPI_INDEX_YRES] > maxy) {
r[VBE_DISPI_INDEX_YRES] = maxy;
}
/* check offset */
if (r[VBE_DISPI_INDEX_X_OFFSET] > VBE_DISPI_MAX_XRES) {
r[VBE_DISPI_INDEX_X_OFFSET] = VBE_DISPI_MAX_XRES;
}
if (r[VBE_DISPI_INDEX_Y_OFFSET] > VBE_DISPI_MAX_YRES) {
r[VBE_DISPI_INDEX_Y_OFFSET] = VBE_DISPI_MAX_YRES;
}
offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;
offset += r[VBE_DISPI_INDEX_Y_OFFSET] * linelength;
if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {
r[VBE_DISPI_INDEX_Y_OFFSET] = 0;
offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;
if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {
r[VBE_DISPI_INDEX_X_OFFSET] = 0;
offset = 0;
}
}
/* update vga state */
r[VBE_DISPI_INDEX_VIRT_HEIGHT] = maxy;
s->vbe_line_offset = linelength;
s->vbe_start_addr = offset / 4;
}
/* we initialize the VGA graphic mode */
static void vbe_update_vgaregs(VGACommonState *s)
{
int h, shift_control;
if (!vbe_enabled(s)) {
/* vbe is turned off -- nothing to do */
return;
}
/* graphic mode + memory map 1 */
s->gr[VGA_GFX_MISC] = (s->gr[VGA_GFX_MISC] & ~0x0c) | 0x04 |
VGA_GR06_GRAPHICS_MODE;
s->cr[VGA_CRTC_MODE] |= 3; /* no CGA modes */
s->cr[VGA_CRTC_OFFSET] = s->vbe_line_offset >> 3;
/* width */
s->cr[VGA_CRTC_H_DISP] =
(s->vbe_regs[VBE_DISPI_INDEX_XRES] >> 3) - 1;
/* height (only meaningful if < 1024) */
h = s->vbe_regs[VBE_DISPI_INDEX_YRES] - 1;
s->cr[VGA_CRTC_V_DISP_END] = h;
s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x42) |
((h >> 7) & 0x02) | ((h >> 3) & 0x40);
/* line compare to 1023 */
s->cr[VGA_CRTC_LINE_COMPARE] = 0xff;
s->cr[VGA_CRTC_OVERFLOW] |= 0x10;
s->cr[VGA_CRTC_MAX_SCAN] |= 0x40;
if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) {
shift_control = 0;
s->sr_vbe[VGA_SEQ_CLOCK_MODE] &= ~8; /* no double line */
} else {
shift_control = 2;
/* set chain 4 mode */
s->sr_vbe[VGA_SEQ_MEMORY_MODE] |= VGA_SR04_CHN_4M;
/* activate all planes */
s->sr_vbe[VGA_SEQ_PLANE_WRITE] |= VGA_SR02_ALL_PLANES;
}
s->gr[VGA_GFX_MODE] = (s->gr[VGA_GFX_MODE] & ~0x60) |
(shift_control << 5);
s->cr[VGA_CRTC_MAX_SCAN] &= ~0x9f; /* no double scan */
}
static uint32_t vbe_ioport_read_index(void *opaque, uint32_t addr)
{
VGACommonState *s = opaque;
return s->vbe_index;
}
uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr)
{
VGACommonState *s = opaque;
uint32_t val;
if (s->vbe_index < VBE_DISPI_INDEX_NB) {
if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_GETCAPS) {
switch(s->vbe_index) {
/* XXX: do not hardcode ? */
case VBE_DISPI_INDEX_XRES:
val = VBE_DISPI_MAX_XRES;
break;
case VBE_DISPI_INDEX_YRES:
val = VBE_DISPI_MAX_YRES;
break;
case VBE_DISPI_INDEX_BPP:
val = VBE_DISPI_MAX_BPP;
break;
default:
val = s->vbe_regs[s->vbe_index];
break;
}
} else {
val = s->vbe_regs[s->vbe_index];
}
} else if (s->vbe_index == VBE_DISPI_INDEX_VIDEO_MEMORY_64K) {
val = s->vbe_size / (64 * KiB);
} else {
val = 0;
}
trace_vga_vbe_read(s->vbe_index, val);
return val;
}
void vbe_ioport_write_index(void *opaque, uint32_t addr, uint32_t val)
{
VGACommonState *s = opaque;
s->vbe_index = val;
}
void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
{
VGACommonState *s = opaque;
if (s->vbe_index <= VBE_DISPI_INDEX_NB) {
trace_vga_vbe_write(s->vbe_index, val);
switch(s->vbe_index) {
case VBE_DISPI_INDEX_ID:
if (val == VBE_DISPI_ID0 ||
val == VBE_DISPI_ID1 ||
val == VBE_DISPI_ID2 ||
val == VBE_DISPI_ID3 ||
val == VBE_DISPI_ID4 ||
val == VBE_DISPI_ID5) {
s->vbe_regs[s->vbe_index] = val;
}
break;
case VBE_DISPI_INDEX_XRES:
case VBE_DISPI_INDEX_YRES:
case VBE_DISPI_INDEX_BPP:
case VBE_DISPI_INDEX_VIRT_WIDTH:
case VBE_DISPI_INDEX_X_OFFSET:
case VBE_DISPI_INDEX_Y_OFFSET:
s->vbe_regs[s->vbe_index] = val;
vbe_fixup_regs(s);
vbe_update_vgaregs(s);
break;
case VBE_DISPI_INDEX_BANK:
val &= s->vbe_bank_mask;
s->vbe_regs[s->vbe_index] = val;
s->bank_offset = (val << 16);
vga_update_memory_access(s);
break;
case VBE_DISPI_INDEX_ENABLE:
if ((val & VBE_DISPI_ENABLED) &&
!(s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {
s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] = 0;
s->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] = 0;
s->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] = 0;
s->vbe_regs[VBE_DISPI_INDEX_ENABLE] |= VBE_DISPI_ENABLED;
vbe_fixup_regs(s);
vbe_update_vgaregs(s);
/* clear the screen */
if (!(val & VBE_DISPI_NOCLEARMEM)) {
memset(s->vram_ptr, 0,
s->vbe_regs[VBE_DISPI_INDEX_YRES] * s->vbe_line_offset);
}
} else {
s->bank_offset = 0;
}
s->dac_8bit = (val & VBE_DISPI_8BIT_DAC) > 0;
s->vbe_regs[s->vbe_index] = val;
vga_update_memory_access(s);
break;
default:
break;
}
}
}
/* called for accesses between 0xa0000 and 0xc0000 */
uint32_t vga_mem_readb(VGACommonState *s, hwaddr addr)
{
int memory_map_mode, plane;
uint32_t ret;
/* convert to VGA memory offset */
memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
addr &= 0x1ffff;
switch(memory_map_mode) {
case 0:
break;
case 1:
if (addr >= 0x10000)
return 0xff;
addr += s->bank_offset;
break;
case 2:
addr -= 0x10000;
if (addr >= 0x8000)
return 0xff;
break;
default:
case 3:
addr -= 0x18000;
if (addr >= 0x8000)
return 0xff;
break;
}
if (sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_CHN_4M) {
/* chain4 mode */
plane = addr & 3;
addr &= ~3;
} else if (s->gr[VGA_GFX_MODE] & VGA_GR05_HOST_ODD_EVEN) {
/* odd/even mode (aka text mode mapping) */
plane = (s->gr[VGA_GFX_PLANE_READ] & 2) | (addr & 1);
} else {
/* standard VGA latched access */
plane = s->gr[VGA_GFX_PLANE_READ];
}
if (s->gr[VGA_GFX_MISC] & VGA_GR06_CHAIN_ODD_EVEN) {
addr &= ~1;
}
/* Doubleword/word mode. See comment in vga_mem_writeb */
if (s->cr[VGA_CRTC_UNDERLINE] & VGA_CR14_DW) {
addr >>= 2;
} else if ((s->gr[VGA_GFX_MODE] & VGA_GR05_HOST_ODD_EVEN) &&
(s->cr[VGA_CRTC_MODE] & VGA_CR17_WORD_BYTE) == 0) {
addr >>= 1;
}
if (addr * sizeof(uint32_t) >= s->vram_size) {
return 0xff;
}
if (s->sr[VGA_SEQ_MEMORY_MODE] & VGA_SR04_CHN_4M) {
/* chain 4 mode: simplified access (but it should use the same
* algorithms as below, see e.g. vga_mem_writeb's plane mask check).
*/
return s->vram_ptr[(addr << 2) | plane];
}
s->latch = ((uint32_t *)s->vram_ptr)[addr];
if (!(s->gr[VGA_GFX_MODE] & 0x08)) {
/* read mode 0 */
ret = GET_PLANE(s->latch, plane);
} else {
/* read mode 1 */
ret = (s->latch ^ mask16[s->gr[VGA_GFX_COMPARE_VALUE]]) &
mask16[s->gr[VGA_GFX_COMPARE_MASK]];
ret |= ret >> 16;
ret |= ret >> 8;
ret = (~ret) & 0xff;
}
return ret;
}
/* called for accesses between 0xa0000 and 0xc0000 */
void vga_mem_writeb(VGACommonState *s, hwaddr addr, uint32_t val)
{
int memory_map_mode, write_mode, b, func_select, mask;
uint32_t write_mask, bit_mask, set_mask;
int plane = 0;
#ifdef DEBUG_VGA_MEM
printf("vga: [0x" HWADDR_FMT_plx "] = 0x%02x\n", addr, val);
#endif
/* convert to VGA memory offset */
memory_map_mode = (s->gr[VGA_GFX_MISC] >> 2) & 3;
addr &= 0x1ffff;
switch(memory_map_mode) {
case 0:
break;
case 1:
if (addr >= 0x10000)
return;
addr += s->bank_offset;
break;
case 2:
addr -= 0x10000;
if (addr >= 0x8000)
return;
break;
default:
case 3:
addr -= 0x18000;
if (addr >= 0x8000)
return;
break;
}
mask = sr(s, VGA_SEQ_PLANE_WRITE);
if (sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_CHN_4M) {
/* chain 4 mode : simplest access */
plane = addr & 3;
mask &= (1 << plane);
addr &= ~3;
} else {
if ((sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_SEQ_MODE) == 0) {
mask &= (addr & 1) ? 0x0a : 0x05;
}
if (s->gr[VGA_GFX_MISC] & VGA_GR06_CHAIN_ODD_EVEN) {
addr &= ~1;
}
}
/* Doubleword/word mode. These should be honored when displaying,
* not when reading/writing to memory! For example, chain4 modes
* use double-word mode and, on real hardware, would fetch bytes
* 0,1,2,3, 16,17,18,19, 32,33,34,35, etc. Text modes use word
* mode and, on real hardware, would fetch bytes 0,1, 8,9, etc.
*
* QEMU instead shifted addresses on memory accesses because it
* allows more optimizations (e.g. chain4_alias) and simplifies
* the draw_line handlers. Unfortunately, there is one case where
* the difference shows. When fetching font data, accesses are
* always in consecutive bytes, even if the text/attribute pairs
* are done in word mode. Hence, doing a right shift when operating
* on font data is wrong. So check the odd/even mode bits together with
* word mode bit. The odd/even read bit is 0 when reading font data,
* and the odd/even write bit is 1 when writing it.
*/
if (s->cr[VGA_CRTC_UNDERLINE] & VGA_CR14_DW) {
addr >>= 2;
} else if ((sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_SEQ_MODE) == 0 &&
(s->cr[VGA_CRTC_MODE] & VGA_CR17_WORD_BYTE) == 0) {
addr >>= 1;
}
if (addr * sizeof(uint32_t) >= s->vram_size) {
return;
}
if (sr(s, VGA_SEQ_MEMORY_MODE) & VGA_SR04_CHN_4M) {
if (mask) {
s->vram_ptr[(addr << 2) | plane] = val;
#ifdef DEBUG_VGA_MEM
printf("vga: chain4: [0x" HWADDR_FMT_plx "]\n", addr);
#endif
s->plane_updated |= mask; /* only used to detect font change */
memory_region_set_dirty(&s->vram, addr, 1);
}
return;
}
/* standard VGA latched access */
write_mode = s->gr[VGA_GFX_MODE] & 3;
switch(write_mode) {
default:
case 0:
/* rotate */
b = s->gr[VGA_GFX_DATA_ROTATE] & 7;
val = ((val >> b) | (val << (8 - b))) & 0xff;
val |= val << 8;
val |= val << 16;
/* apply set/reset mask */
set_mask = mask16[s->gr[VGA_GFX_SR_ENABLE]];
val = (val & ~set_mask) |
(mask16[s->gr[VGA_GFX_SR_VALUE]] & set_mask);
bit_mask = s->gr[VGA_GFX_BIT_MASK];
break;
case 1:
val = s->latch;
goto do_write;
case 2:
val = mask16[val & 0x0f];
bit_mask = s->gr[VGA_GFX_BIT_MASK];
break;
case 3:
/* rotate */
b = s->gr[VGA_GFX_DATA_ROTATE] & 7;
val = (val >> b) | (val << (8 - b));
bit_mask = s->gr[VGA_GFX_BIT_MASK] & val;
val = mask16[s->gr[VGA_GFX_SR_VALUE]];
break;
}
/* apply logical operation */
func_select = s->gr[VGA_GFX_DATA_ROTATE] >> 3;
switch(func_select) {
case 0:
default:
/* nothing to do */
break;
case 1:
/* and */
val &= s->latch;
break;
case 2:
/* or */
val |= s->latch;
break;
case 3:
/* xor */
val ^= s->latch;
break;
}
/* apply bit mask */
bit_mask |= bit_mask << 8;
bit_mask |= bit_mask << 16;
val = (val & bit_mask) | (s->latch & ~bit_mask);
do_write:
/* mask data according to sr[2] */
s->plane_updated |= mask; /* only used to detect font change */
write_mask = mask16[mask];
((uint32_t *)s->vram_ptr)[addr] =
(((uint32_t *)s->vram_ptr)[addr] & ~write_mask) |
(val & write_mask);
#ifdef DEBUG_VGA_MEM
printf("vga: latch: [0x" HWADDR_FMT_plx "] mask=0x%08x val=0x%08x\n",
addr * 4, write_mask, val);
#endif
memory_region_set_dirty(&s->vram, addr << 2, sizeof(uint32_t));
}
typedef void *vga_draw_line_func(VGACommonState *s1, uint8_t *d,
uint32_t srcaddr, int width, int hpel);
#include "vga-access.h"
#include "vga-helpers.h"
/* return true if the palette was modified */
static int update_palette16(VGACommonState *s)
{
int full_update, i;
uint32_t v, col, *palette;
full_update = 0;
palette = s->last_palette;
for(i = 0; i < 16; i++) {
v = s->ar[i];
if (s->ar[VGA_ATC_MODE] & 0x80) {
v = ((s->ar[VGA_ATC_COLOR_PAGE] & 0xf) << 4) | (v & 0xf);
} else {
v = ((s->ar[VGA_ATC_COLOR_PAGE] & 0xc) << 4) | (v & 0x3f);
}
v = v * 3;
col = rgb_to_pixel32(c6_to_8(s->palette[v]),
c6_to_8(s->palette[v + 1]),
c6_to_8(s->palette[v + 2]));
if (col != palette[i]) {
full_update = 1;
palette[i] = col;
}
}
return full_update;
}
/* return true if the palette was modified */
static int update_palette256(VGACommonState *s)
{
int full_update, i;
uint32_t v, col, *palette;
full_update = 0;
palette = s->last_palette;
v = 0;
for(i = 0; i < 256; i++) {
if (s->dac_8bit) {
col = rgb_to_pixel32(s->palette[v],
s->palette[v + 1],
s->palette[v + 2]);
} else {
col = rgb_to_pixel32(c6_to_8(s->palette[v]),
c6_to_8(s->palette[v + 1]),
c6_to_8(s->palette[v + 2]));
}
if (col != palette[i]) {
full_update = 1;
palette[i] = col;
}
v += 3;
}
return full_update;
}
static void vga_get_params(VGACommonState *s,
VGADisplayParams *params)
{
if (vbe_enabled(s)) {
params->line_offset = s->vbe_line_offset;
params->start_addr = s->vbe_start_addr;
params->line_compare = 65535;
params->hpel = VGA_HPEL_NEUTRAL;
params->hpel_split = false;
} else {
/* compute line_offset in bytes */
params->line_offset = s->cr[VGA_CRTC_OFFSET] << 3;
/* starting address */
params->start_addr = s->cr[VGA_CRTC_START_LO] |
(s->cr[VGA_CRTC_START_HI] << 8);
/* line compare */
params->line_compare = s->cr[VGA_CRTC_LINE_COMPARE] |
((s->cr[VGA_CRTC_OVERFLOW] & 0x10) << 4) |
((s->cr[VGA_CRTC_MAX_SCAN] & 0x40) << 3);
params->hpel = s->ar[VGA_ATC_PEL];
params->hpel_split = s->ar[VGA_ATC_MODE] & 0x20;
}
}
/* update start_addr and line_offset. Return TRUE if modified */
static int update_basic_params(VGACommonState *s)
{
int full_update;
VGADisplayParams current;
full_update = 0;
s->get_params(s, &current);
if (memcmp(&current, &s->params, sizeof(current))) {
s->params = current;
full_update = 1;
}
return full_update;
}
static const uint8_t cursor_glyph[32 * 4] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
static void vga_get_text_resolution(VGACommonState *s, int *pwidth, int *pheight,
int *pcwidth, int *pcheight)
{
int width, cwidth, height, cheight;
/* total width & height */
cheight = (s->cr[VGA_CRTC_MAX_SCAN] & 0x1f) + 1;
cwidth = 8;
if (!(sr(s, VGA_SEQ_CLOCK_MODE) & VGA_SR01_CHAR_CLK_8DOTS)) {
cwidth = 9;
}
if (sr(s, VGA_SEQ_CLOCK_MODE) & 0x08) {
cwidth = 16; /* NOTE: no 18 pixel wide */
}
width = (s->cr[VGA_CRTC_H_DISP] + 1);
if (s->cr[VGA_CRTC_V_TOTAL] == 100) {
/* ugly hack for CGA 160x100x16 - explain me the logic */
height = 100;
} else {
height = s->cr[VGA_CRTC_V_DISP_END] |
((s->cr[VGA_CRTC_OVERFLOW] & 0x02) << 7) |
((s->cr[VGA_CRTC_OVERFLOW] & 0x40) << 3);
height = (height + 1) / cheight;
}
*pwidth = width;
*pheight = height;
*pcwidth = cwidth;
*pcheight = cheight;
}
/*
* Text mode update
* Missing:
* - double scan
* - double width
* - underline
* - flashing
*/
static void vga_draw_text(VGACommonState *s, int full_update)
{
DisplaySurface *surface = qemu_console_surface(s->con);
int cx, cy, cheight, cw, ch, cattr, height, width, ch_attr;
int cx_min, cx_max, linesize, x_incr, line, line1;
uint32_t offset, fgcol, bgcol, v, cursor_offset;
uint8_t *d1, *d, *src, *dest, *cursor_ptr;
const uint8_t *font_ptr, *font_base[2];
int dup9, line_offset;
uint32_t *palette;
uint32_t *ch_attr_ptr;
int64_t now = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
/* compute font data address (in plane 2) */
v = sr(s, VGA_SEQ_CHARACTER_MAP);
offset = (((v >> 4) & 1) | ((v << 1) & 6)) * 8192 * 4 + 2;
if (offset != s->font_offsets[0]) {
s->font_offsets[0] = offset;
full_update = 1;
}
font_base[0] = s->vram_ptr + offset;
offset = (((v >> 5) & 1) | ((v >> 1) & 6)) * 8192 * 4 + 2;
font_base[1] = s->vram_ptr + offset;
if (offset != s->font_offsets[1]) {
s->font_offsets[1] = offset;
full_update = 1;
}
if (s->plane_updated & (1 << 2) || s->has_chain4_alias) {
/* if the plane 2 was modified since the last display, it
indicates the font may have been modified */
s->plane_updated = 0;
full_update = 1;
}
full_update |= update_basic_params(s);
line_offset = s->params.line_offset;
vga_get_text_resolution(s, &width, &height, &cw, &cheight);
if ((height * width) <= 1) {
/* better than nothing: exit if transient size is too small */
return;
}
if ((height * width) > CH_ATTR_SIZE) {
/* better than nothing: exit if transient size is too big */
return;
}
if (width != s->last_width || height != s->last_height ||
cw != s->last_cw || cheight != s->last_ch || s->last_depth) {
s->last_scr_width = width * cw;
s->last_scr_height = height * cheight;
qemu_console_resize(s->con, s->last_scr_width, s->last_scr_height);
surface = qemu_console_surface(s->con);
dpy_text_resize(s->con, width, height);
s->last_depth = 0;
s->last_width = width;
s->last_height = height;
s->last_ch = cheight;
s->last_cw = cw;
full_update = 1;
}
full_update |= update_palette16(s);
palette = s->last_palette;
x_incr = cw * surface_bytes_per_pixel(surface);
if (full_update) {
s->full_update_text = 1;
}
if (s->full_update_gfx) {
s->full_update_gfx = 0;
full_update |= 1;
}
cursor_offset = ((s->cr[VGA_CRTC_CURSOR_HI] << 8) |
s->cr[VGA_CRTC_CURSOR_LO]) - s->params.start_addr;
if (cursor_offset != s->cursor_offset ||
s->cr[VGA_CRTC_CURSOR_START] != s->cursor_start ||
s->cr[VGA_CRTC_CURSOR_END] != s->cursor_end) {
/* if the cursor position changed, we update the old and new
chars */
if (s->cursor_offset < CH_ATTR_SIZE)
s->last_ch_attr[s->cursor_offset] = -1;
if (cursor_offset < CH_ATTR_SIZE)
s->last_ch_attr[cursor_offset] = -1;
s->cursor_offset = cursor_offset;
s->cursor_start = s->cr[VGA_CRTC_CURSOR_START];
s->cursor_end = s->cr[VGA_CRTC_CURSOR_END];
}
cursor_ptr = s->vram_ptr + (s->params.start_addr + cursor_offset) * 4;
if (now >= s->cursor_blink_time) {
s->cursor_blink_time = now + VGA_TEXT_CURSOR_PERIOD_MS / 2;
s->cursor_visible_phase = !s->cursor_visible_phase;
}
dest = surface_data(surface);
linesize = surface_stride(surface);
ch_attr_ptr = s->last_ch_attr;
line = 0;
offset = s->params.start_addr * 4;
for(cy = 0; cy < height; cy++) {
d1 = dest;
src = s->vram_ptr + offset;
cx_min = width;
cx_max = -1;
for(cx = 0; cx < width; cx++) {
if (src + sizeof(uint16_t) > s->vram_ptr + s->vram_size) {
break;
}
ch_attr = *(uint16_t *)src;
if (full_update || ch_attr != *ch_attr_ptr || src == cursor_ptr) {
if (cx < cx_min)
cx_min = cx;
if (cx > cx_max)
cx_max = cx;
*ch_attr_ptr = ch_attr;
#if HOST_BIG_ENDIAN
ch = ch_attr >> 8;
cattr = ch_attr & 0xff;
#else
ch = ch_attr & 0xff;
cattr = ch_attr >> 8;
#endif
font_ptr = font_base[(cattr >> 3) & 1];
font_ptr += 32 * 4 * ch;
bgcol = palette[cattr >> 4];
fgcol = palette[cattr & 0x0f];
if (cw == 16) {
vga_draw_glyph16(d1, linesize,
font_ptr, cheight, fgcol, bgcol);
} else if (cw != 9) {
vga_draw_glyph8(d1, linesize,
font_ptr, cheight, fgcol, bgcol);
} else {
dup9 = 0;
if (ch >= 0xb0 && ch <= 0xdf &&
(s->ar[VGA_ATC_MODE] & 0x04)) {
dup9 = 1;
}
vga_draw_glyph9(d1, linesize,
font_ptr, cheight, fgcol, bgcol, dup9);
}
if (src == cursor_ptr &&
!(s->cr[VGA_CRTC_CURSOR_START] & 0x20) &&
s->cursor_visible_phase) {
int line_start, line_last, h;
/* draw the cursor */
line_start = s->cr[VGA_CRTC_CURSOR_START] & 0x1f;
line_last = s->cr[VGA_CRTC_CURSOR_END] & 0x1f;
/* XXX: check that */
if (line_last > cheight - 1)
line_last = cheight - 1;
if (line_last >= line_start && line_start < cheight) {
h = line_last - line_start + 1;
d = d1 + linesize * line_start;
if (cw == 16) {
vga_draw_glyph16(d, linesize,
cursor_glyph, h, fgcol, bgcol);
} else if (cw != 9) {
vga_draw_glyph8(d, linesize,
cursor_glyph, h, fgcol, bgcol);
} else {
vga_draw_glyph9(d, linesize,
cursor_glyph, h, fgcol, bgcol, 1);
}
}
}
}
d1 += x_incr;
src += 4;
ch_attr_ptr++;
}
if (cx_max != -1) {
dpy_gfx_update(s->con, cx_min * cw, cy * cheight,
(cx_max - cx_min + 1) * cw, cheight);
}
dest += linesize * cheight;
line1 = line + cheight;
offset += line_offset;
if (line < s->params.line_compare && line1 >= s->params.line_compare) {
offset = 0;
}
line = line1;
}
}
enum {
VGA_DRAW_LINE2,
VGA_DRAW_LINE2D2,
VGA_DRAW_LINE4,
VGA_DRAW_LINE4D2,
VGA_DRAW_LINE8D2,
VGA_DRAW_LINE8,
VGA_DRAW_LINE15_LE,
VGA_DRAW_LINE16_LE,
VGA_DRAW_LINE24_LE,
VGA_DRAW_LINE32_LE,
VGA_DRAW_LINE15_BE,
VGA_DRAW_LINE16_BE,
VGA_DRAW_LINE24_BE,
VGA_DRAW_LINE32_BE,
VGA_DRAW_LINE_NB,
};
static vga_draw_line_func * const vga_draw_line_table[VGA_DRAW_LINE_NB] = {
vga_draw_line2,
vga_draw_line2d2,
vga_draw_line4,
vga_draw_line4d2,
vga_draw_line8d2,
vga_draw_line8,
vga_draw_line15_le,
vga_draw_line16_le,
vga_draw_line24_le,
vga_draw_line32_le,
vga_draw_line15_be,
vga_draw_line16_be,
vga_draw_line24_be,
vga_draw_line32_be,
};
static int vga_get_bpp(VGACommonState *s)
{
int ret;
if (vbe_enabled(s)) {
ret = s->vbe_regs[VBE_DISPI_INDEX_BPP];
} else {
ret = 0;
}
return ret;
}
static void vga_get_resolution(VGACommonState *s, int *pwidth, int *pheight)
{
int width, height;
if (vbe_enabled(s)) {
width = s->vbe_regs[VBE_DISPI_INDEX_XRES];
height = s->vbe_regs[VBE_DISPI_INDEX_YRES];
} else {
width = (s->cr[VGA_CRTC_H_DISP] + 1) * 8;
height = s->cr[VGA_CRTC_V_DISP_END] |
((s->cr[VGA_CRTC_OVERFLOW] & 0x02) << 7) |
((s->cr[VGA_CRTC_OVERFLOW] & 0x40) << 3);
height = (height + 1);
}
*pwidth = width;
*pheight = height;
}
void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2)
{
int y;
if (y1 >= VGA_MAX_HEIGHT)
return;
if (y2 >= VGA_MAX_HEIGHT)
y2 = VGA_MAX_HEIGHT;
for(y = y1; y < y2; y++) {
s->invalidated_y_table[y >> 5] |= 1 << (y & 0x1f);
}
}
static bool vga_scanline_invalidated(VGACommonState *s, int y)
{
if (y >= VGA_MAX_HEIGHT) {
return false;
}
return s->invalidated_y_table[y >> 5] & (1 << (y & 0x1f));
}
void vga_dirty_log_start(VGACommonState *s)
{
memory_region_set_log(&s->vram, true, DIRTY_MEMORY_VGA);
}
void vga_dirty_log_stop(VGACommonState *s)
{
memory_region_set_log(&s->vram, false, DIRTY_MEMORY_VGA);
}
/*
* graphic modes
*/
static void vga_draw_graphic(VGACommonState *s, int full_update)
{
DisplaySurface *surface = qemu_console_surface(s->con);
int y1, y, update, linesize, y_start, double_scan, mask, depth;
int width, height, shift_control, bwidth, bits;
ram_addr_t page0, page1, region_start, region_end;
DirtyBitmapSnapshot *snap = NULL;
int disp_width, multi_scan, multi_run;
int hpel;
uint8_t *d;
uint32_t v, addr1, addr;
vga_draw_line_func *vga_draw_line = NULL;
bool allocate_surface, force_shadow = false;
pixman_format_code_t format;
#if HOST_BIG_ENDIAN
bool byteswap = !s->big_endian_fb;
#else
bool byteswap = s->big_endian_fb;
#endif
full_update |= update_basic_params(s);
s->get_resolution(s, &width, &height);
disp_width = width;
depth = s->get_bpp(s);
/* bits 5-6: 0 = 16-color mode, 1 = 4-color mode, 2 = 256-color mode. */
shift_control = (s->gr[VGA_GFX_MODE] >> 5) & 3;
double_scan = (s->cr[VGA_CRTC_MAX_SCAN] >> 7);
if (s->cr[VGA_CRTC_MODE] & 1) {
multi_scan = (((s->cr[VGA_CRTC_MAX_SCAN] & 0x1f) + 1) << double_scan)
- 1;
} else {
/* in CGA modes, multi_scan is ignored */
/* XXX: is it correct ? */
multi_scan = double_scan;
}
multi_run = multi_scan;
if (shift_control != s->shift_control ||
double_scan != s->double_scan) {
full_update = 1;
s->shift_control = shift_control;
s->double_scan = double_scan;
}
if (shift_control == 0) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
disp_width <<= 1;
v = VGA_DRAW_LINE4D2;
} else {
v = VGA_DRAW_LINE4;
}
bits = 4;
} else if (shift_control == 1) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
disp_width <<= 1;
v = VGA_DRAW_LINE2D2;
} else {
v = VGA_DRAW_LINE2;
}
bits = 4;
} else {
switch (depth) {
default:
case 0:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8D2;
bits = 4;
break;
case 8:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8;
bits = 8;
break;
case 15:
v = s->big_endian_fb ? VGA_DRAW_LINE15_BE : VGA_DRAW_LINE15_LE;
bits = 16;
break;
case 16:
v = s->big_endian_fb ? VGA_DRAW_LINE16_BE : VGA_DRAW_LINE16_LE;
bits = 16;
break;
case 24:
v = s->big_endian_fb ? VGA_DRAW_LINE24_BE : VGA_DRAW_LINE24_LE;
bits = 24;
break;
case 32:
v = s->big_endian_fb ? VGA_DRAW_LINE32_BE : VGA_DRAW_LINE32_LE;
bits = 32;
break;
}
}
/* Horizontal pel panning bit 3 is only used in text mode. */
hpel = bits <= 8 ? s->params.hpel & 7 : 0;
bwidth = DIV_ROUND_UP(width * bits, 8); /* scanline length */
if (hpel) {
bwidth += 4;
}
region_start = (s->params.start_addr * 4);
region_end = region_start + (ram_addr_t)s->params.line_offset * (height - 1) + bwidth;
if (region_end > s->vbe_size) {
/*
* On wrap around take the safe and slow route:
* - create a dirty bitmap snapshot for all vga memory.
* - force shadowing (so all vga memory access goes
* through vga_read_*() helpers).
*
* Given this affects only vga features which are pretty much
* unused by modern guests there should be no performance
* impact.
*/
region_start = 0;
region_end = s->vbe_size;
force_shadow = true;
}
if (s->params.line_compare < height) {
/* split screen mode */
region_start = 0;
}
/*
* Check whether we can share the surface with the backend
* or whether we need a shadow surface. We share native
* endian surfaces for 15bpp and above and byteswapped
* surfaces for 24bpp and above.
*/
format = qemu_default_pixman_format(depth, !byteswap);
if (format) {
allocate_surface = !dpy_gfx_check_format(s->con, format)
|| s->force_shadow || force_shadow;
} else {
allocate_surface = true;
}
if (s->params.line_offset != s->last_line_offset ||
disp_width != s->last_width ||
height != s->last_height ||
s->last_depth != depth ||
s->last_byteswap != byteswap ||
allocate_surface != surface_is_allocated(surface)) {
/* display parameters changed -> need new display surface */
s->last_scr_width = disp_width;
s->last_scr_height = height;
s->last_width = disp_width;
s->last_height = height;
s->last_line_offset = s->params.line_offset;
s->last_depth = depth;
s->last_byteswap = byteswap;
/* 16 extra pixels are needed for double-width planar modes. */
s->panning_buf = g_realloc(s->panning_buf,
(disp_width + 16) * sizeof(uint32_t));
full_update = 1;
}
if (surface_data(surface) != s->vram_ptr + (s->params.start_addr * 4)
&& !surface_is_allocated(surface)) {
/* base address changed (page flip) -> shared display surfaces
* must be updated with the new base address */
full_update = 1;
}
if (full_update) {
if (!allocate_surface) {
surface = qemu_create_displaysurface_from(disp_width,
height, format, s->params.line_offset,
s->vram_ptr + (s->params.start_addr * 4));
dpy_gfx_replace_surface(s->con, surface);
} else {
qemu_console_resize(s->con, disp_width, height);
surface = qemu_console_surface(s->con);
}
}
vga_draw_line = vga_draw_line_table[v];
if (surface_is_allocated(surface) && s->cursor_invalidate) {
s->cursor_invalidate(s);
}
#if 0
printf("w=%d h=%d v=%d line_offset=%d cr[0x09]=0x%02x cr[0x17]=0x%02x linecmp=%d sr[0x01]=0x%02x\n",
width, height, v, line_offset, s->cr[9], s->cr[VGA_CRTC_MODE],
s->params.line_compare, sr(s, VGA_SEQ_CLOCK_MODE));
#endif
addr1 = (s->params.start_addr * 4);
y_start = -1;
d = surface_data(surface);
linesize = surface_stride(surface);
y1 = 0;
if (!full_update) {
snap = memory_region_snapshot_and_clear_dirty(&s->vram, region_start,
region_end - region_start,
DIRTY_MEMORY_VGA);
}
for(y = 0; y < height; y++) {
addr = addr1;
if (!(s->cr[VGA_CRTC_MODE] & 1)) {
int shift;
/* CGA compatibility handling */
shift = 14 + ((s->cr[VGA_CRTC_MODE] >> 6) & 1);
addr = (addr & ~(1 << shift)) | ((y1 & 1) << shift);
}
if (!(s->cr[VGA_CRTC_MODE] & 2)) {
addr = (addr & ~0x8000) | ((y1 & 2) << 14);
}
page0 = addr & s->vbe_size_mask;
page1 = (addr + bwidth - 1) & s->vbe_size_mask;
if (full_update) {
update = 1;
} else if (page1 < page0) {
/* scanline wraps from end of video memory to the start */
assert(force_shadow);
update = memory_region_snapshot_get_dirty(&s->vram, snap,
page0, s->vbe_size - page0);
update |= memory_region_snapshot_get_dirty(&s->vram, snap,
0, page1);
} else {
update = memory_region_snapshot_get_dirty(&s->vram, snap,
page0, page1 - page0);
}
/* explicit invalidation for the hardware cursor (cirrus only) */
update |= vga_scanline_invalidated(s, y);
if (update) {
if (y_start < 0)
y_start = y;
if (surface_is_allocated(surface)) {
uint8_t *p;
p = vga_draw_line(s, d, addr, width, hpel);
if (p) {
memcpy(d, p, disp_width * sizeof(uint32_t));
}
if (s->cursor_draw_line)
s->cursor_draw_line(s, d, y);
}
} else {
if (y_start >= 0) {
/* flush to display */
dpy_gfx_update(s->con, 0, y_start,
disp_width, y - y_start);
y_start = -1;
}
}
if (!multi_run) {
mask = (s->cr[VGA_CRTC_MODE] & 3) ^ 3;
if ((y1 & mask) == mask)
addr1 += s->params.line_offset;
y1++;
multi_run = multi_scan;
} else {
multi_run--;
}
/* line compare acts on the displayed lines */
if (y == s->params.line_compare) {
if (s->params.hpel_split) {
hpel = VGA_HPEL_NEUTRAL;
}
addr1 = 0;
}
d += linesize;
}
if (y_start >= 0) {
/* flush to display */
dpy_gfx_update(s->con, 0, y_start,
disp_width, y - y_start);
}
g_free(snap);
memset(s->invalidated_y_table, 0, sizeof(s->invalidated_y_table));
}
static void vga_draw_blank(VGACommonState *s, int full_update)
{
DisplaySurface *surface = qemu_console_surface(s->con);
int i, w;
uint8_t *d;
if (!full_update)
return;
if (s->last_scr_width <= 0 || s->last_scr_height <= 0)
return;
if (!surface_is_allocated(surface)) {
/* unshare buffer, otherwise the blanking corrupts vga vram */
surface = qemu_create_displaysurface(s->last_scr_width,
s->last_scr_height);
dpy_gfx_replace_surface(s->con, surface);
}
w = s->last_scr_width * surface_bytes_per_pixel(surface);
d = surface_data(surface);
for(i = 0; i < s->last_scr_height; i++) {
memset(d, 0, w);
d += surface_stride(surface);
}
dpy_gfx_update_full(s->con);
}
#define GMODE_TEXT 0
#define GMODE_GRAPH 1
#define GMODE_BLANK 2
static void vga_update_display(void *opaque)
{
VGACommonState *s = opaque;
DisplaySurface *surface = qemu_console_surface(s->con);
int full_update, graphic_mode;
qemu_flush_coalesced_mmio_buffer();
if (surface_bits_per_pixel(surface) == 0) {
/* nothing to do */
} else {
full_update = 0;
if (!(s->ar_index & 0x20)) {
graphic_mode = GMODE_BLANK;
} else {
graphic_mode = s->gr[VGA_GFX_MISC] & VGA_GR06_GRAPHICS_MODE;
}
if (graphic_mode != s->graphic_mode) {
s->graphic_mode = graphic_mode;
s->cursor_blink_time = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
full_update = 1;
}
switch(graphic_mode) {
case GMODE_TEXT:
vga_draw_text(s, full_update);
break;
case GMODE_GRAPH:
vga_draw_graphic(s, full_update);
break;
case GMODE_BLANK:
default:
vga_draw_blank(s, full_update);
break;
}
}
}
/* force a full display refresh */
static void vga_invalidate_display(void *opaque)
{
VGACommonState *s = opaque;
s->last_width = -1;
s->last_height = -1;
}
void vga_common_reset(VGACommonState *s)
{
s->sr_index = 0;
memset(s->sr, '\0', sizeof(s->sr));
memset(s->sr_vbe, '\0', sizeof(s->sr_vbe));
s->gr_index = 0;
memset(s->gr, '\0', sizeof(s->gr));
s->ar_index = 0;
memset(s->ar, '\0', sizeof(s->ar));
s->ar_flip_flop = 0;
s->cr_index = 0;
memset(s->cr, '\0', sizeof(s->cr));
s->msr = 0;
s->fcr = 0;
s->st00 = 0;
s->st01 = 0;
s->dac_state = 0;
s->dac_sub_index = 0;
s->dac_read_index = 0;
s->dac_write_index = 0;
memset(s->dac_cache, '\0', sizeof(s->dac_cache));
s->dac_8bit = 0;
memset(s->palette, '\0', sizeof(s->palette));
s->bank_offset = 0;
s->vbe_index = 0;
memset(s->vbe_regs, '\0', sizeof(s->vbe_regs));
s->vbe_regs[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
s->vbe_start_addr = 0;
s->vbe_line_offset = 0;
s->vbe_bank_mask = (s->vram_size >> 16) - 1;
memset(s->font_offsets, '\0', sizeof(s->font_offsets));
s->graphic_mode = -1; /* force full update */
s->shift_control = 0;
s->double_scan = 0;
memset(&s->params, '\0', sizeof(s->params));
s->plane_updated = 0;
s->last_cw = 0;
s->last_ch = 0;
s->last_width = 0;
s->last_height = 0;
s->last_scr_width = 0;
s->last_scr_height = 0;
s->cursor_start = 0;
s->cursor_end = 0;
s->cursor_offset = 0;
s->big_endian_fb = s->default_endian_fb;
memset(s->invalidated_y_table, '\0', sizeof(s->invalidated_y_table));
memset(s->last_palette, '\0', sizeof(s->last_palette));
memset(s->last_ch_attr, '\0', sizeof(s->last_ch_attr));
switch (vga_retrace_method) {
case VGA_RETRACE_DUMB:
break;
case VGA_RETRACE_PRECISE:
memset(&s->retrace_info, 0, sizeof (s->retrace_info));
break;
}
vga_update_memory_access(s);
}
static void vga_reset(void *opaque)
{
VGACommonState *s = opaque;
vga_common_reset(s);
}
#define TEXTMODE_X(x) ((x) % width)
#define TEXTMODE_Y(x) ((x) / width)
#define VMEM2CHTYPE(v) ((v & 0xff0007ff) | \
((v & 0x00000800) << 10) | ((v & 0x00007000) >> 1))
/* relay text rendering to the display driver
* instead of doing a full vga_update_display() */
static void vga_update_text(void *opaque, console_ch_t *chardata)
{
VGACommonState *s = opaque;
int graphic_mode, i, cursor_offset, cursor_visible;
int cw, cheight, width, height, size, c_min, c_max;
uint32_t *src;
console_ch_t *dst, val;
char msg_buffer[80];
int full_update = 0;
qemu_flush_coalesced_mmio_buffer();
if (!(s->ar_index & 0x20)) {
graphic_mode = GMODE_BLANK;
} else {
graphic_mode = s->gr[VGA_GFX_MISC] & VGA_GR06_GRAPHICS_MODE;
}
if (graphic_mode != s->graphic_mode) {
s->graphic_mode = graphic_mode;
full_update = 1;
}
if (s->last_width == -1) {
s->last_width = 0;
full_update = 1;
}
switch (graphic_mode) {
case GMODE_TEXT:
/* TODO: update palette */
full_update |= update_basic_params(s);
/* total width & height */
cheight = (s->cr[VGA_CRTC_MAX_SCAN] & 0x1f) + 1;
cw = 8;
if (!(sr(s, VGA_SEQ_CLOCK_MODE) & VGA_SR01_CHAR_CLK_8DOTS)) {
cw = 9;
}
if (sr(s, VGA_SEQ_CLOCK_MODE) & 0x08) {
cw = 16; /* NOTE: no 18 pixel wide */
}
width = (s->cr[VGA_CRTC_H_DISP] + 1);
if (s->cr[VGA_CRTC_V_TOTAL] == 100) {
/* ugly hack for CGA 160x100x16 - explain me the logic */
height = 100;
} else {
height = s->cr[VGA_CRTC_V_DISP_END] |
((s->cr[VGA_CRTC_OVERFLOW] & 0x02) << 7) |
((s->cr[VGA_CRTC_OVERFLOW] & 0x40) << 3);
height = (height + 1) / cheight;
}
size = (height * width);
if (size > CH_ATTR_SIZE) {
if (!full_update)
return;
snprintf(msg_buffer, sizeof(msg_buffer), "%i x %i Text mode",
width, height);
break;
}
if (width != s->last_width || height != s->last_height ||
cw != s->last_cw || cheight != s->last_ch) {
s->last_scr_width = width * cw;
s->last_scr_height = height * cheight;
qemu_console_resize(s->con, s->last_scr_width, s->last_scr_height);
dpy_text_resize(s->con, width, height);
s->last_depth = 0;
s->last_width = width;
s->last_height = height;
s->last_ch = cheight;
s->last_cw = cw;
full_update = 1;
}
if (full_update) {
s->full_update_gfx = 1;
}
if (s->full_update_text) {
s->full_update_text = 0;
full_update |= 1;
}
/* Update "hardware" cursor */
cursor_offset = ((s->cr[VGA_CRTC_CURSOR_HI] << 8) |
s->cr[VGA_CRTC_CURSOR_LO]) - s->params.start_addr;
if (cursor_offset != s->cursor_offset ||
s->cr[VGA_CRTC_CURSOR_START] != s->cursor_start ||
s->cr[VGA_CRTC_CURSOR_END] != s->cursor_end || full_update) {
cursor_visible = !(s->cr[VGA_CRTC_CURSOR_START] & 0x20);
if (cursor_visible && cursor_offset < size && cursor_offset >= 0)
dpy_text_cursor(s->con,
TEXTMODE_X(cursor_offset),
TEXTMODE_Y(cursor_offset));
else
dpy_text_cursor(s->con, -1, -1);
s->cursor_offset = cursor_offset;
s->cursor_start = s->cr[VGA_CRTC_CURSOR_START];
s->cursor_end = s->cr[VGA_CRTC_CURSOR_END];
}
src = (uint32_t *) s->vram_ptr + s->params.start_addr;
dst = chardata;
if (full_update) {
for (i = 0; i < size; src ++, dst ++, i ++)
console_write_ch(dst, VMEM2CHTYPE(le32_to_cpu(*src)));
dpy_text_update(s->con, 0, 0, width, height);
} else {
c_max = 0;
for (i = 0; i < size; src ++, dst ++, i ++) {
console_write_ch(&val, VMEM2CHTYPE(le32_to_cpu(*src)));
if (*dst != val) {
*dst = val;
c_max = i;
break;
}
}
c_min = i;
for (; i < size; src ++, dst ++, i ++) {
console_write_ch(&val, VMEM2CHTYPE(le32_to_cpu(*src)));
if (*dst != val) {
*dst = val;
c_max = i;
}
}
if (c_min <= c_max) {
i = TEXTMODE_Y(c_min);
dpy_text_update(s->con, 0, i, width, TEXTMODE_Y(c_max) - i + 1);
}
}
return;
case GMODE_GRAPH:
if (!full_update)
return;
s->get_resolution(s, &width, &height);
snprintf(msg_buffer, sizeof(msg_buffer), "%i x %i Graphic mode",
width, height);
break;
case GMODE_BLANK:
default:
if (!full_update)
return;
snprintf(msg_buffer, sizeof(msg_buffer), "VGA Blank mode");
break;
}
/* Display a message */
s->last_width = 60;
s->last_height = height = 3;
dpy_text_cursor(s->con, -1, -1);
dpy_text_resize(s->con, s->last_width, height);
for (dst = chardata, i = 0; i < s->last_width * height; i ++)
console_write_ch(dst ++, ' ');
size = strlen(msg_buffer);
width = (s->last_width - size) / 2;
dst = chardata + s->last_width + width;
for (i = 0; i < size; i ++)
console_write_ch(dst ++, ATTR2CHTYPE(msg_buffer[i], QEMU_COLOR_BLUE,
QEMU_COLOR_BLACK, 1));
dpy_text_update(s->con, 0, 0, s->last_width, height);
}
static uint64_t vga_mem_read(void *opaque, hwaddr addr,
unsigned size)
{
VGACommonState *s = opaque;
return vga_mem_readb(s, addr);
}
static void vga_mem_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VGACommonState *s = opaque;
vga_mem_writeb(s, addr, data);
}
const MemoryRegionOps vga_mem_ops = {
.read = vga_mem_read,
.write = vga_mem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static int vga_common_post_load(void *opaque, int version_id)
{
VGACommonState *s = opaque;
/* force refresh */
s->graphic_mode = -1;
vbe_update_vgaregs(s);
vga_update_memory_access(s);
return 0;
}
static bool vga_endian_state_needed(void *opaque)
{
VGACommonState *s = opaque;
/*
* Only send the endian state if it's different from the
* default one, thus ensuring backward compatibility for
* migration of the common case
*/
return s->default_endian_fb != s->big_endian_fb;
}
static const VMStateDescription vmstate_vga_endian = {
.name = "vga.endian",
.version_id = 1,
.minimum_version_id = 1,
.needed = vga_endian_state_needed,
.fields = (const VMStateField[]) {
VMSTATE_BOOL(big_endian_fb, VGACommonState),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_vga_common = {
.name = "vga",
.version_id = 2,
.minimum_version_id = 2,
.post_load = vga_common_post_load,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(latch, VGACommonState),
VMSTATE_UINT8(sr_index, VGACommonState),
VMSTATE_PARTIAL_BUFFER(sr, VGACommonState, 8),
VMSTATE_UINT8(gr_index, VGACommonState),
VMSTATE_PARTIAL_BUFFER(gr, VGACommonState, 16),
VMSTATE_UINT8(ar_index, VGACommonState),
VMSTATE_BUFFER(ar, VGACommonState),
VMSTATE_INT32(ar_flip_flop, VGACommonState),
VMSTATE_UINT8(cr_index, VGACommonState),
VMSTATE_BUFFER(cr, VGACommonState),
VMSTATE_UINT8(msr, VGACommonState),
VMSTATE_UINT8(fcr, VGACommonState),
VMSTATE_UINT8(st00, VGACommonState),
VMSTATE_UINT8(st01, VGACommonState),
VMSTATE_UINT8(dac_state, VGACommonState),
VMSTATE_UINT8(dac_sub_index, VGACommonState),
VMSTATE_UINT8(dac_read_index, VGACommonState),
VMSTATE_UINT8(dac_write_index, VGACommonState),
VMSTATE_BUFFER(dac_cache, VGACommonState),
VMSTATE_BUFFER(palette, VGACommonState),
VMSTATE_INT32(bank_offset, VGACommonState),
VMSTATE_UINT8_EQUAL(is_vbe_vmstate, VGACommonState, NULL),
VMSTATE_UINT16(vbe_index, VGACommonState),
VMSTATE_UINT16_ARRAY(vbe_regs, VGACommonState, VBE_DISPI_INDEX_NB),
VMSTATE_UINT32(vbe_start_addr, VGACommonState),
VMSTATE_UINT32(vbe_line_offset, VGACommonState),
VMSTATE_UINT32(vbe_bank_mask, VGACommonState),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * const []) {
&vmstate_vga_endian,
NULL
}
};
static const GraphicHwOps vga_ops = {
.invalidate = vga_invalidate_display,
.gfx_update = vga_update_display,
.text_update = vga_update_text,
};
static inline uint32_t uint_clamp(uint32_t val, uint32_t vmin, uint32_t vmax)
{
if (val < vmin) {
return vmin;
}
if (val > vmax) {
return vmax;
}
return val;
}
bool vga_common_init(VGACommonState *s, Object *obj, Error **errp)
{
int i, j, v, b;
Error *local_err = NULL;
for(i = 0;i < 256; i++) {
v = 0;
for(j = 0; j < 8; j++) {
v |= ((i >> j) & 1) << (j * 4);
}
expand4[i] = v;
v = 0;
for(j = 0; j < 4; j++) {
v |= ((i >> (2 * j)) & 3) << (j * 4);
}
expand2[i] = v;
}
for(i = 0; i < 16; i++) {
v = 0;
for(j = 0; j < 4; j++) {
b = ((i >> j) & 1);
v |= b << (2 * j);
v |= b << (2 * j + 1);
}
expand4to8[i] = v;
}
s->vram_size_mb = uint_clamp(s->vram_size_mb, 1, 512);
s->vram_size_mb = pow2ceil(s->vram_size_mb);
s->vram_size = s->vram_size_mb * MiB;
if (!s->vbe_size) {
s->vbe_size = s->vram_size;
}
s->vbe_size_mask = s->vbe_size - 1;
s->is_vbe_vmstate = 1;
if (s->global_vmstate && qemu_ram_block_by_name("vga.vram")) {
error_setg(errp, "Only one global VGA device can be used at a time");
return false;
}
memory_region_init_ram_nomigrate(&s->vram, obj, "vga.vram", s->vram_size,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return false;
}
vmstate_register_ram(&s->vram, s->global_vmstate ? NULL : DEVICE(obj));
xen_register_framebuffer(&s->vram);
s->vram_ptr = memory_region_get_ram_ptr(&s->vram);
s->get_bpp = vga_get_bpp;
s->get_params = vga_get_params;
s->get_resolution = vga_get_resolution;
s->hw_ops = &vga_ops;
switch (vga_retrace_method) {
case VGA_RETRACE_DUMB:
s->retrace = vga_dumb_retrace;
s->update_retrace_info = vga_dumb_update_retrace_info;
break;
case VGA_RETRACE_PRECISE:
s->retrace = vga_precise_retrace;
s->update_retrace_info = vga_precise_update_retrace_info;
break;
}
/*
* Set default fb endian based on target, could probably be turned
* into a device attribute set by the machine/platform to remove
* all target endian dependencies from this file.
*/
s->default_endian_fb = target_words_bigendian();
vga_dirty_log_start(s);
return true;
}
static const MemoryRegionPortio vga_portio_list[] = {
{ 0x04, 2, 1, .read = vga_ioport_read, .write = vga_ioport_write }, /* 3b4 */
{ 0x0a, 1, 1, .read = vga_ioport_read, .write = vga_ioport_write }, /* 3ba */
{ 0x10, 16, 1, .read = vga_ioport_read, .write = vga_ioport_write }, /* 3c0 */
{ 0x24, 2, 1, .read = vga_ioport_read, .write = vga_ioport_write }, /* 3d4 */
{ 0x2a, 1, 1, .read = vga_ioport_read, .write = vga_ioport_write }, /* 3da */
PORTIO_END_OF_LIST(),
};
static const MemoryRegionPortio vbe_portio_list_x86[] = {
{ 0, 1, 2, .read = vbe_ioport_read_index, .write = vbe_ioport_write_index },
{ 1, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
{ 2, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
PORTIO_END_OF_LIST(),
};
static const MemoryRegionPortio vbe_portio_list_no_x86[] = {
{ 0, 1, 2, .read = vbe_ioport_read_index, .write = vbe_ioport_write_index },
{ 2, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
PORTIO_END_OF_LIST(),
};
/* Used by both ISA and PCI */
MemoryRegion *vga_init_io(VGACommonState *s, Object *obj,
const MemoryRegionPortio **vga_ports,
const MemoryRegionPortio **vbe_ports)
{
MemoryRegion *vga_mem;
MachineState *ms = MACHINE(qdev_get_machine());
/*
* We unfortunately need two VBE lists since non-x86 machines might
* not be able to do 16-bit accesses at unaligned addresses (0x1cf)
*/
if (object_dynamic_cast(OBJECT(ms), TYPE_X86_MACHINE)) {
*vbe_ports = vbe_portio_list_x86;
} else {
*vbe_ports = vbe_portio_list_no_x86;
}
*vga_ports = vga_portio_list;
vga_mem = g_malloc(sizeof(*vga_mem));
memory_region_init_io(vga_mem, obj, &vga_mem_ops, s,
"vga-lowmem", 0x20000);
memory_region_set_flush_coalesced(vga_mem);
return vga_mem;
}
void vga_init(VGACommonState *s, Object *obj, MemoryRegion *address_space,
MemoryRegion *address_space_io, bool init_vga_ports)
{
MemoryRegion *vga_io_memory;
const MemoryRegionPortio *vga_ports, *vbe_ports;
qemu_register_reset(vga_reset, s);
s->bank_offset = 0;
s->legacy_address_space = address_space;
vga_io_memory = vga_init_io(s, obj, &vga_ports, &vbe_ports);
memory_region_add_subregion_overlap(address_space,
0x000a0000,
vga_io_memory,
1);
memory_region_set_coalescing(vga_io_memory);
if (init_vga_ports) {
portio_list_init(&s->vga_port_list, obj, vga_ports, s, "vga");
portio_list_set_flush_coalesced(&s->vga_port_list);
portio_list_add(&s->vga_port_list, address_space_io, 0x3b0);
}
if (vbe_ports) {
portio_list_init(&s->vbe_port_list, obj, vbe_ports, s, "vbe");
portio_list_add(&s->vbe_port_list, address_space_io, 0x1ce);
}
}