#include "vga_regs.h"
+#ifndef CONFIG_DEBUG_VGA
+#undef PrintDebug
+#define PrintDebug(fmt, args...)
+#endif
+
+#define DEBUG_MEM_DATA 0
+#define DEBUG_DEEP_MEM 0
+#define DEBUG_DEEP_RENDER 0
+
+
#define MEM_REGION_START 0xa0000
#define MEM_REGION_END 0xc0000
#define MEM_REGION_NUM_PAGES (((MEM_REGION_END)-(MEM_REGION_START))/4096)
}
+
static void find_text_attr_start(struct vga_internal *vga, void **data)
{
uint32_t offset;
}
+static void find_graphics_data_starting_offset(struct vga_internal *vga, uint32_t *offset)
+{
+
+ *offset = vga->vga_crt_controller.vga_start_address_high;
+ *offset <<= 8;
+ *offset += vga->vga_crt_controller.vga_start_address_low;
+}
+
+
+static void find_shift_mode(struct vga_internal *vga, shift_mode_t *mode)
+{
+ if (vga->vga_graphics_controller.vga_graphics_mode.c256) {
+ *mode=C256_SHIFT;
+ } else {
+ if (vga->vga_graphics_controller.vga_graphics_mode.shift_reg_mode) {
+ *mode=PACKED_SHIFT;
+ } else {
+ *mode=PLANAR_SHIFT;
+ }
+ }
+}
+
+
static void find_graphics_res(struct vga_internal *vga, uint32_t *width, uint32_t *height)
{
uint32_t vert_lsb, vert_msb;
+ (vga->vga_crt_controller.vga_overflow.vertical_disp_enable_end8);
*height = ( (vert_msb << 8) + vert_lsb + 1) ; // pixels high (scanlines)
+
+ // At this point we have the resolution in dot clocks across and scanlines top-to-bottom
+ // This is usually the resolution in pixels, but it can be monkeyed with
+ // at least in the following ways
+
+ // vga sequencer dot clock divide by two
+ if (vga->vga_sequencer.vga_clocking_mode.dot_clock) {
+ *width/=2;
+ *height/=2;
+ }
+
+ // crt_controller.max_row_scan.double_scan => each row twice for 200=>400
+ if (vga->vga_crt_controller.vga_max_row_scan.double_scan) {
+ *height/=2;
+ }
+
+ // crt_controller.crt_mode_control.count_by_two => pixels twice as wide as normal
+ if (vga->vga_crt_controller.vga_crt_mode_control.count_by_two) {
+ *width /= 2;
+ }
+
+ // crt_controller.crt_mode_control.horizontal_retrace_select => pixels twice as tall as normal
+ if (vga->vga_crt_controller.vga_crt_mode_control.horizontal_retrace_select) {
+ *height /= 2;
+ }
}
}
-static void find_shift_mode(struct vga_internal *vga, shift_mode_t *mode)
-{
- if (vga->vga_graphics_controller.vga_graphics_mode.c256) {
- *mode=C256_SHIFT;
- } else {
- if (vga->vga_graphics_controller.vga_graphics_mode.shift_reg_mode) {
- *mode=PACKED_SHIFT;
- } else {
- *mode=PLANAR_SHIFT;
- }
- }
-}
-
static void dac_lookup_24bit_color(struct vga_internal *vga,
uint8_t entry,
uint8_t *red,
find_graphics_cursor_pos(vga,&cur_x,&cur_y);
+ find_graphics_data_starting_offset(vga,&offset);
+
fw = spec->width;
fh = spec->height;
PrintDebug("vga: attempting graphics render (%s): graphics_res=(%u,%u), fb_res=(%u,%u), "
- "fb=0x%p (16 color mode)\n",
+ "fb=0x%p offset=0x%x\n",
sm == PLANAR_SHIFT ? "planar shift" :
sm == PACKED_SHIFT ? "packed shift" :
sm == C256_SHIFT ? "color256 shift" : "UNKNOWN",
- gw,gh,fw,fh, fb);
+ gw,gh,fw,fh,fb,offset);
// First we need to clip to what we can actually show
rgw = gw < fw ? gw : fw;
- rgh = gh < fh ? gh : gw;
+ rgh = gh < fh ? gh : fh;
if (gw%8) {
PrintError("vga: warning: graphics width is not a multiple of 8\n");
}
- offset=0; // do we always start at zero in the map?
+
// Now we scan across by row
for (fy=0;fy<gh;fy++) {
for (fx=0;fx<gw;
fx += (sm==C256_SHIFT ? 4 : 8) , offset++ ) {
- // if any of these pixels are in the renger region
+ // if any of these pixels are in the rendger region
if (fy < rgh && fx < rgw) {
// assemble all 4 or 8 pixels
case PLANAR_SHIFT:
for (p=0;p<8;p++) {
pb[p]=
- ( db[0] >> 7) |
- ( db[1] >> 6) |
- ( db[2] >> 5) |
- ( db[3] >> 4) ;
+ (( db[0] >> 7) & 0x1) |
+ (( db[1] >> 6) & 0x2) |
+ (( db[2] >> 5) & 0x4) |
+ (( db[3] >> 4) & 0x8) ;
for (m=0;m<4;m++) {
db[m] <<= 1;
// first 4 pixels use planes 0 and 2
for (p=0;p<4;p++) {
pb[p] =
- ( db[2] >> 4) |
- ( db[0] >> 6) ;
+ ((db[2] >> 4) & 0xc) |
+ ((db[0] >> 6) & 0x3) ;
db[2] <<= 2;
db[0] <<= 2;
}
// next 4 pixels use planes 1 and 3
for (p=4;p<8;p++) {
pb[p] =
- ( db[3] >> 4) |
- ( db[1] >> 6) ;
+ ((db[3] >> 4) & 0xc) |
+ ((db[1] >> 6) & 0x3) ;
db[3] <<= 2;
db[1] <<= 2;
}
for (p=0;p< (sm==C256_SHIFT ? 4 : 8);p++) {
// find its color
- find_24bit_color(vga,db[p],&r,&g,&b);
+ find_24bit_color(vga,pb[p],&r,&g,&b);
// find its position in the framebuffer;
pixel = fb + (((fx + p) + (fy*spec->width)) * spec->bytes_per_pixel);
}
}
+static void render_black(struct vga_internal *vga, void *fb)
+{
+ struct v3_frame_buffer_spec *s;
+
+ s=&(vga->target_spec);
+
+ memset(fb,0,s->height*s->width*s->bytes_per_pixel);
+}
+
static void render_maps(struct vga_internal *vga, void *fb)
{
fb = v3_graphics_console_get_frame_buffer_data_rw(vga->host_cons,&(vga->target_spec));
- if (vga->vga_graphics_controller.vga_misc.graphics_mode) {
- render_graphics(vga,fb);
+ if (!(vga->vga_sequencer.vga_clocking_mode.screen_off)) {
+ if (vga->vga_attribute_controller.vga_attribute_mode_control.graphics) {
+ render_graphics(vga,fb);
+ } else {
+ render_text(vga,fb);
+ render_text_cursor(vga,fb);
+ }
} else {
- render_text(vga,fb);
- render_text_cursor(vga,fb);
+ render_black(vga,fb);
}
if (0) { render_test(vga,fb); }
+ // always render maps for now
render_maps(vga,fb);
v3_graphics_console_release_frame_buffer_data_rw(vga->host_cons);
memcpy(V3_VAddr((void*)guest_addr),src,length);
}
-#if 0
+#if DEBUG_MEM_DATA
int i;
PrintDebug("vga: data written was 0x");
for (i=0;i<length;i++) {
offset = find_offset_write(vga, guest_addr);
+#if DEBUG_DEEP_MEM
PrintDebug("vga: mode 0 write, offset=0x%llx, ror=%u, func=%u\n", offset,ror,func);
+#endif
for (i=0;i<length;i++,offset+=find_increment_write(vga,guest_addr+i)) {
// now for each map
uint8_t bm = vga->vga_graphics_controller.vga_bit_mask;
uint8_t mm = find_map_write(vga,guest_addr+i);
- //PrintDebug("vga: write i=%u, mm=0x%x, offset=0x%x\n",i,(unsigned int)mm,(unsigned int)offset);
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: write i=%u, mm=0x%x, bm=0x%x sr=0x%x esr=0x%x offset=0x%x\n",i,(unsigned int)mm,(unsigned int)bm, (unsigned int)sr, (unsigned int)esr,(unsigned int)offset);
+#endif
- for (mapnum=0;mapnum<4;mapnum++, sr>>=1, esr>>=1, bm>>=1, mm>>=1) {
+ for (mapnum=0;mapnum<4;mapnum++, sr>>=1, esr>>=1, mm>>=1) {
vga_map map = vga->map[mapnum];
uint8_t data = ((uint8_t *)src)[i];
uint8_t latchval = vga->latch[mapnum];
-
+
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: raw data=0x%x\n",data);
+#endif
// rotate data right
- data = (data>>ror) | data<<(8-ror);
-
+ if (ror) {
+ data = (data>>ror) | data<<(8-ror);
+ }
+
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: data after ror=0x%x\n",data);
+#endif
// use SR bit if ESR is on for this map
- if (esr & 0x1) {
- data = (uint8_t)((((sint8_t)(sr&0x1))<<7)>>7); // expand sr bit
+ if (esr & 0x1) {
+ data = (sr&0x1) * -1;
+
}
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: data after esrr=0x%x\n",data);
+#endif
+
// Apply function
switch (func) {
case 0: // NOP
data ^= latchval;
break;
}
-
- // mux between latch and alu output
- if (bm & 0x1) {
- // use alu output, which is in data
- } else {
- // use latch value
- data=latchval;
- }
+
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: data after func=0x%x\n",data);
+#endif
+
+ // mux between the data byte and the latch byte on
+ // a per-bit basis
+ data = (bm & data) | ((~bm) & latchval);
+
+
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: data after bm mux=0x%x\n",data);
+#endif
// selective write
if (mm & 0x1) {
// write to this map
- //PrintDebug("vga: write map %u offset 0x%p map=0x%p pointer=0x%p\n",mapnum,(void*)offset,map,&(map[offset]));
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: write map %u offset 0x%p map=0x%p pointer=0x%p\n",mapnum,(void*)offset,map,&(map[offset]));
+#endif
map[offset] = data;
} else {
// skip this map
uint64_t offset = find_offset_write(vga,guest_addr);
+#if DEBUG_DEEP_MEM
PrintDebug("vga: mode 1 write, offset=0x%llx\n", offset);
+#endif
for (i=0;i<length;i++,offset+=find_increment_write(vga,guest_addr+i)) {
offset = find_offset_write(vga, guest_addr);
+#if DEBUG_DEEP_MEM
PrintDebug("vga: mode 2 write, offset=0x%llx, func=%u\n", offset,func);
+#endif
for (i=0;i<length;i++,offset+=find_increment_write(vga,guest_addr+i)) {
// now for each map
uint8_t latchval = vga->latch[mapnum];
// expand relevant bit to 8 bit
- // it's basically esr=1, sr=bit from write
- data = (uint8_t)(((sint8_t)(((data>>mapnum)&0x1)<<7))>>7);
-
+ // it's basically esr=1, sr=bit from mode 0 write
+ data = ((data>>mapnum)&0x1) * -1;
+
// Apply function
switch (func) {
case 0: // NOP
data ^= latchval;
break;
}
-
+
// mux between latch and alu output
- if (bm & 0x1) {
- // use alu output, which is in data
- } else {
- // use latch value
- data=latchval;
- }
+ data = (bm & data) | ((~bm) & latchval);
// selective write
if (mm & 0x1) {
// now for each map
uint8_t data = ((uint8_t *)src)[i];
- data = (data>>ror) | data<<(8-ror);
+ if (ror) {
+ data = (data>>ror) | data<<(8-ror);
+ }
uint8_t bm = vga->vga_graphics_controller.vga_bit_mask & data;
uint8_t sr = vga->vga_graphics_controller.vga_set_reset.val & 0xf;
vga_map map = vga->map[mapnum];
uint8_t latchval = vga->latch[mapnum];
- data = (uint8_t)((((sint8_t)(sr&0x1))<<7)>>7); // expand sr bit
-
-
+ // expand SR bit
+ data = (sr&0x1) * -1;
+
// mux between latch and alu output
- if (bm & 0x1) {
- // use alu output, which is in data
- } else {
- // use latch value
- data=latchval;
- }
+ data = (bm & data) | ((~bm) & latchval);
// selective write
if (mm & 0x1) {
// address bytes select the map
for (i=0;i<length;i++,offset+=find_increment_read(vga,guest_addr+i)) {
mapnum = (guest_addr+i) % 4;
- ((uint8_t*)dst)[i] = vga->latch[mapnum] = *(vga->map[mapnum]+offset);
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: mode 0 read, chain4, offset=0x%llx, mapnum=%u\n",offset,mapnum);
+#endif
+ ((uint8_t*)dst)[i] = *(vga->map[mapnum]+offset);
+
+ // presumably all the latches are to be reloaded, not just the selected one?
+ for (mapnum=0;mapnum<4;mapnum++) {
+ vga->latch[mapnum] = *(vga->map[mapnum]+offset);
+ }
}
} else {
mapnum = vga->vga_graphics_controller.vga_read_map_select.map_select;
PrintError("vga: read to offset=%llu map=%u (%u bytes)\n",offset,mapnum,length);
}
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: mode 0 read, not-chain4, offset=0x%llx, mapnum=%u\n",offset,mapnum);
+#endif
+
memcpy(dst,(vga->map[mapnum])+offset,length);
// load the latches with the last item read
uint8_t bits;
offset = find_offset_read(vga,guest_addr);
+
+#if DEBUG_DEEP_MEM
+ PrintDebug("vga: mode 1 read, offset=0x%llx, cc=0x%x, dc-0x%x\n",offset,cc,dc);
+#endif
+
for (i=0;i<length;i++,offset++) {
vga_map map;
}
-#if 0
+#if DEBUG_MEM_DATA
int i;
PrintDebug("vga: data read is 0x");
for (i=0;i<length;i++) {
