vgabios: Make struct vgamode_s more similar to bochs/cirrus mode tables.

For graphics modes, store pixel width/height instead of text
width/height.  Add explicit char width field.  Where needed, calculate
text width/height from pixel width/height by dividing pixel count by
character size.

Rename some fields and change field sizes to match cirrus/bochs
definitions.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/vgasrc/stdvga.h b/vgasrc/stdvga.h
index 0a99d37..735022c 100644
--- a/vgasrc/stdvga.h
+++ b/vgasrc/stdvga.h
@@ -45,12 +45,13 @@
 #define SEG_MTEXT 0xB000
 
 struct vgamode_s {
-    u8 svgamode;
-    u8 memmodel;    /* CTEXT,MTEXT,CGA,PL1,PL2,PL4,P8,P15,P16,P24,P32 */
-    u8 twidth;
-    u8 theight;
+    u16 mode;
+    u8 memmodel;
+    u16 width;
+    u16 height;
+    u8 depth;
+    u8 cwidth;
     u8 cheight;
-    u8 pixbits;
     u16 sstart;
     u16 slength;
 
diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c
index 7bed069..31636cc 100644
--- a/vgasrc/vgabios.c
+++ b/vgasrc/vgabios.c
@@ -329,18 +329,26 @@
 modeswitch_set_bda(int mode, int flags, struct vgamode_s *vmode_g)
 {
     // Set the BIOS mem
-    u16 cheight = GET_GLOBAL(vmode_g->cheight);
+    int width = GET_GLOBAL(vmode_g->width);
+    int height = GET_GLOBAL(vmode_g->height);
+    int cheight = GET_GLOBAL(vmode_g->cheight);
     SET_BDA(video_mode, mode);
-    SET_BDA(video_cols, GET_GLOBAL(vmode_g->twidth));
+    if (GET_GLOBAL(vmode_g->memmodel) == MM_TEXT) {
+        SET_BDA(video_cols, width);
+        SET_BDA(video_rows, height-1);
+        SET_BDA(cursor_type, 0x0607);
+    } else {
+        int cwidth = GET_GLOBAL(vmode_g->cwidth);
+        SET_BDA(video_cols, width / cwidth);
+        SET_BDA(video_rows, (height / cheight) - 1);
+        SET_BDA(cursor_type, 0x0000);
+    }
     SET_BDA(video_pagesize, GET_GLOBAL(vmode_g->slength));
     SET_BDA(crtc_address, stdvga_get_crtc());
-    SET_BDA(video_rows, GET_GLOBAL(vmode_g->theight)-1);
     SET_BDA(char_height, cheight);
     SET_BDA(video_ctl, 0x60 | (flags & MF_NOCLEARMEM ? 0x80 : 0x00));
     SET_BDA(video_switches, 0xF9);
     SET_BDA(modeset_ctl, GET_BDA(modeset_ctl) & 0x7f);
-    SET_BDA(cursor_type
-            , GET_GLOBAL(vmode_g->memmodel) == MM_TEXT ? 0x0607 : 0x0000);
     int i;
     for (i=0; i<8; i++)
         SET_BDA(cursor_pos[i], 0x0000);
diff --git a/vgasrc/vgafb.c b/vgasrc/vgafb.c
index 0f33720..eb4ced8 100644
--- a/vgasrc/vgafb.c
+++ b/vgasrc/vgafb.c
@@ -75,7 +75,7 @@
             , struct cursorpos ul, struct cursorpos lr)
 {
     int cheight = GET_GLOBAL(vmode_g->cheight) / 2;
-    int cwidth = GET_GLOBAL(vmode_g->pixbits);
+    int cwidth = GET_GLOBAL(vmode_g->depth);
     int stride = GET_BDA(video_cols) * cwidth;
     void *src_far, *dest_far;
     if (nblines >= 0) {
@@ -253,7 +253,7 @@
         return;
 
     u8 *fdata_g = vgafont8;
-    u8 bpp = GET_GLOBAL(vmode_g->pixbits);
+    u8 bpp = GET_GLOBAL(vmode_g->depth);
     u16 addr = (cp.x * bpp) + cp.y * 320;
     u16 src = ca.car * 8;
     u8 i;
@@ -431,14 +431,14 @@
         stdvga_grdc_write(0x03, 0x00);
         break;
     case MM_CGA:
-        if (GET_GLOBAL(vmode_g->pixbits) == 2)
+        if (GET_GLOBAL(vmode_g->depth) == 2)
             addr_far = (void*)((x >> 2) + (y >> 1) * 80);
         else
             addr_far = (void*)((x >> 3) + (y >> 1) * 80);
         if (y & 1)
             addr_far += 0x2000;
         data = GET_FARVAR(SEG_CTEXT, *addr_far);
-        if (GET_GLOBAL(vmode_g->pixbits) == 2) {
+        if (GET_GLOBAL(vmode_g->depth) == 2) {
             attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
             mask = 0x03 << ((3 - (x & 0x03)) * 2);
         } else {
@@ -489,7 +489,7 @@
         if (y & 1)
             addr_far += 0x2000;
         data = GET_FARVAR(SEG_CTEXT, *addr_far);
-        if (GET_GLOBAL(vmode_g->pixbits) == 2)
+        if (GET_GLOBAL(vmode_g->depth) == 2)
             attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
         else
             attr = (data >> (7 - (x & 0x07))) & 0x01;
diff --git a/vgasrc/vgatables.c b/vgasrc/vgatables.c
index fe860eb..314222e 100644
--- a/vgasrc/vgatables.c
+++ b/vgasrc/vgatables.c
@@ -54,16 +54,25 @@
 
     int i;
     for (i=0; i<ARRAY_SIZE(parammodes); i++) {
-        u8 mode = GET_GLOBAL(parammodes[i]);
+        int mode = GET_GLOBAL(parammodes[i]);
         if (! mode)
             continue;
         struct VideoParam_s *vparam_g = &video_param_table[i];
         struct vgamode_s *vmode_g = find_vga_entry(mode);
         if (!vmode_g)
             continue;
-        SET_VGA(vparam_g->twidth, GET_GLOBAL(vmode_g->twidth));
-        SET_VGA(vparam_g->theightm1, GET_GLOBAL(vmode_g->theight)-1);
-        SET_VGA(vparam_g->cheight, GET_GLOBAL(vmode_g->cheight));
+        int width = GET_GLOBAL(vmode_g->width);
+        int height = GET_GLOBAL(vmode_g->height);
+        int cheight = GET_GLOBAL(vmode_g->cheight);
+        if (GET_GLOBAL(vmode_g->memmodel) == MM_TEXT) {
+            SET_VGA(vparam_g->twidth, width);
+            SET_VGA(vparam_g->theightm1, height-1);
+        } else {
+            int cwidth = GET_GLOBAL(vmode_g->cwidth);
+            SET_VGA(vparam_g->twidth, width / cwidth);
+            SET_VGA(vparam_g->theightm1, (height / cheight) - 1);
+        }
+        SET_VGA(vparam_g->cheight, cheight);
         SET_VGA(vparam_g->slength, GET_GLOBAL(vmode_g->slength));
         memcpy_far(get_global_seg(), vparam_g->sequ_regs
                    , get_global_seg(), GET_GLOBAL(vmode_g->sequ_regs)
@@ -337,39 +346,39 @@
 #define VPARAM(x) &video_param_table[x]
 
 static struct vgamode_s vga_modes[] VAR16 = {
-    //mode model       tx  ty bpp cw ch  sstart     slength
+    //mode model       tx   ty bpp cw ch  sstart     slength
     // pelm  dac            sequ     misc  crtc     actl     grdc
-    {0x00, MM_TEXT,    40, 25, 4, 9, 16, SEG_CTEXT, 0x0800
+    {0x00, MM_TEXT,    40,  25, 4, 9, 16, SEG_CTEXT, 0x0800
      , 0xFF, PAL(palette2), sequ_01, 0x67, crtc_01, actl_01, grdc_01},
-    {0x01, MM_TEXT,    40, 25, 4, 9, 16, SEG_CTEXT, 0x0800
+    {0x01, MM_TEXT,    40,  25, 4, 9, 16, SEG_CTEXT, 0x0800
      , 0xFF, PAL(palette2), sequ_01, 0x67, crtc_01, actl_01, grdc_01},
-    {0x02, MM_TEXT,    80, 25, 4, 9, 16, SEG_CTEXT, 0x1000
+    {0x02, MM_TEXT,    80,  25, 4, 9, 16, SEG_CTEXT, 0x1000
      , 0xFF, PAL(palette2), sequ_03, 0x67, crtc_03, actl_01, grdc_01},
-    {0x03, MM_TEXT,    80, 25, 4, 9, 16, SEG_CTEXT, 0x1000
+    {0x03, MM_TEXT,    80,  25, 4, 9, 16, SEG_CTEXT, 0x1000
      , 0xFF, PAL(palette2), sequ_03, 0x67, crtc_03, actl_01, grdc_01},
-    {0x04, MM_CGA,     40, 25, 2, 8,  8, SEG_CTEXT, 0x0800
+    {0x04, MM_CGA,    320, 200, 2, 8,  8, SEG_CTEXT, 0x0800
      , 0xFF, PAL(palette1), sequ_04, 0x63, crtc_04, actl_04, grdc_04},
-    {0x05, MM_CGA,     40, 25, 2, 8,  8, SEG_CTEXT, 0x0800
+    {0x05, MM_CGA,    320, 200, 2, 8,  8, SEG_CTEXT, 0x0800
      , 0xFF, PAL(palette1), sequ_04, 0x63, crtc_04, actl_04, grdc_04},
-    {0x06, MM_CGA,     80, 25, 1, 8,  8, SEG_CTEXT, 0x1000
+    {0x06, MM_CGA,    640, 200, 1, 8,  8, SEG_CTEXT, 0x1000
      , 0xFF, PAL(palette1), sequ_06, 0x63, crtc_06, actl_06, grdc_06},
-    {0x07, MM_TEXT,    80, 25, 4, 9, 16, SEG_MTEXT, 0x1000
+    {0x07, MM_TEXT,    80,  25, 4, 9, 16, SEG_MTEXT, 0x1000
      , 0xFF, PAL(palette0), sequ_03, 0x66, crtc_07, actl_07, grdc_07},
-    {0x0D, MM_PLANAR,  40, 25, 4, 8,  8, SEG_GRAPH, 0x2000
+    {0x0D, MM_PLANAR, 320, 200, 4, 8,  8, SEG_GRAPH, 0x2000
      , 0xFF, PAL(palette1), sequ_0d, 0x63, crtc_0d, actl_0d, grdc_0d},
-    {0x0E, MM_PLANAR,  80, 25, 4, 8,  8, SEG_GRAPH, 0x4000
+    {0x0E, MM_PLANAR, 640, 200, 4, 8,  8, SEG_GRAPH, 0x4000
      , 0xFF, PAL(palette1), sequ_0e, 0x63, crtc_0e, actl_0d, grdc_0d},
-    {0x0F, MM_PLANAR,  80, 25, 1, 8, 14, SEG_GRAPH, 0x8000
+    {0x0F, MM_PLANAR, 640, 350, 1, 8, 14, SEG_GRAPH, 0x8000
      , 0xFF, PAL(palette0), sequ_0e, 0xa3, crtc_0f, actl_0f, grdc_0d},
-    {0x10, MM_PLANAR,  80, 25, 4, 8, 14, SEG_GRAPH, 0x8000
+    {0x10, MM_PLANAR, 640, 350, 4, 8, 14, SEG_GRAPH, 0x8000
      , 0xFF, PAL(palette2), sequ_0e, 0xa3, crtc_0f, actl_10, grdc_0d},
-    {0x11, MM_PLANAR,  80, 30, 1, 8, 16, SEG_GRAPH, 0x0000
+    {0x11, MM_PLANAR, 640, 480, 1, 8, 16, SEG_GRAPH, 0x0000
      , 0xFF, PAL(palette2), sequ_0e, 0xe3, crtc_11, actl_11, grdc_0d},
-    {0x12, MM_PLANAR,  80, 30, 4, 8, 16, SEG_GRAPH, 0x0000
+    {0x12, MM_PLANAR, 640, 480, 4, 8, 16, SEG_GRAPH, 0x0000
      , 0xFF, PAL(palette2), sequ_0e, 0xe3, crtc_11, actl_10, grdc_0d},
-    {0x13, MM_PACKED,  40, 25, 8, 8,  8, SEG_GRAPH, 0x0000
+    {0x13, MM_PACKED, 320, 200, 8, 8,  8, SEG_GRAPH, 0x0000
      , 0xFF, PAL(palette3), sequ_13, 0x63, crtc_13, actl_13, grdc_13},
-    {0x6A, MM_PLANAR, 100, 37, 4, 8, 16, SEG_GRAPH, 0x0000
+    {0x6A, MM_PLANAR, 800, 600, 4, 8, 16, SEG_GRAPH, 0x0000
      , 0xFF, PAL(palette2), sequ_0e, 0xe3, crtc_6A, actl_10, grdc_0d},
 };
 
@@ -379,7 +388,7 @@
     int i;
     for (i = 0; i < ARRAY_SIZE(vga_modes); i++) {
         struct vgamode_s *vmode_g = &vga_modes[i];
-        if (GET_GLOBAL(vmode_g->svgamode) == mode)
+        if (GET_GLOBAL(vmode_g->mode) == mode)
             return vmode_g;
     }
     return NULL;