- added support for a lot more non-standard VBE modes (e.g. widescreen modes) - requires latest Bochs VBE code (16 MB video memory, VBE_DISPI_ID5, VRAM size in 64k pages stored in VBE register) - check if VBE mode is supported with current VRAM size

3 files changed, 91 insertions, 53 deletions

diff --git a/vbe.c b/vbe.c
index 92e3d0d..ecff90d 100644
--- a/vbe.c
+++ b/vbe.c
@@ -38,8 +38,6 @@
 #include "vbe.h"
 #include "vbetables.h"
 
-#define VBE_TOTAL_VIDEO_MEMORY_DIV_64K (VBE_DISPI_TOTAL_VIDEO_MEMORY_MB*1024/64)
-
 // The current OEM Software Revision of this VBE Bios
 #define VBE_OEM_SOFTWARE_REV 0x0002;
 
@@ -715,7 +713,7 @@ vbe_init:
   mov  [bx], al
   pop  bx
   pop  ds
-  mov  ax, # VBE_DISPI_ID4
+  mov  ax, # VBE_DISPI_ID5
   call dispi_set_id
 no_vbe_interface:
 #if defined(USE_BX_INFO) || defined(DEBUG)
@@ -742,7 +740,19 @@ no_vbe_flag:
   mov  ds, ax
   mov  si, #_no_vbebios_info_string
   jmp  _display_string
-ASM_END  
+
+; helper function for memory size calculation
+
+lmulul:
+  and eax, #0x0000FFFF
+  shl ebx, #16
+  or  eax, ebx
+  SEG SS
+  mul eax, dword ptr [di]
+  mov ebx, eax
+  shr ebx, #16
+  ret
+ASM_END
 
 /** Function 00h - Return VBE Controller Information
  * 
@@ -765,6 +775,7 @@ Bit16u *AX;Bit16u ES;Bit16u DI;
         Bit16u            vbe2_info;
         Bit16u            cur_mode=0;
         Bit16u            cur_ptr=34;
+        Bit16u            size_64k;
         ModeInfoListItem  *cur_info=&mode_info_list;
 
         status = read_word(ss, AX);
@@ -820,8 +831,9 @@ Bit16u *AX;Bit16u ES;Bit16u DI;
         vbe_info_block.VideoModePtr_Seg= ES ;
         vbe_info_block.VideoModePtr_Off= DI + 34;
 
-        // VBE Total Memory (in 64b blocks)
-        vbe_info_block.TotalMemory = VBE_TOTAL_VIDEO_MEMORY_DIV_64K;
+        // VBE Total Memory (in 64k blocks)
+        outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_VIDEO_MEMORY_64K);
+        vbe_info_block.TotalMemory = inw(VBE_DISPI_IOPORT_DATA);
 
         if (vbe2_info)
         {
@@ -845,8 +857,11 @@ Bit16u *AX;Bit16u ES;Bit16u DI;
 
         do
         {
+                size_64k = (Bit16u)((Bit32u)cur_info->info.XResolution * cur_info->info.XResolution * cur_info->info.BitsPerPixel) >> 19;
+
                 if ((cur_info->info.XResolution <= dispi_get_max_xres()) &&
-                    (cur_info->info.BitsPerPixel <= dispi_get_max_bpp())) {
+                    (cur_info->info.BitsPerPixel <= dispi_get_max_bpp()) &&
+                    (size_64k <= vbe_info_block.TotalMemory)) {
 #ifdef DEBUG
                   printf("VBE found mode %x => %x\n", cur_info->mode,cur_mode);
 #endif
@@ -855,7 +870,7 @@ Bit16u *AX;Bit16u ES;Bit16u DI;
                   cur_ptr+=2;
                 } else {
 #ifdef DEBUG
-                  printf("VBE mode %x (xres=%x / bpp=%02x) not supported by display\n", cur_info->mode,cur_info->info.XResolution,cur_info->info.BitsPerPixel);
+                  printf("VBE mode %x (xres=%x / bpp=%02x) not supported \n", cur_info->mode,cur_info->info.XResolution,cur_info->info.BitsPerPixel);
 #endif
                 }
                 cur_info++;
diff --git a/vbe.h b/vbe.h
index 60434ac..72cb045 100644
--- a/vbe.h
+++ b/vbe.h
@@ -275,39 +275,41 @@ typedef struct ModeInfoListItem
 //        like 0xE0000000
 
 
-  #define VBE_DISPI_BANK_ADDRESS          0xA0000
-  #define VBE_DISPI_BANK_SIZE_KB          64
-  
-  #define VBE_DISPI_MAX_XRES              1024
-  #define VBE_DISPI_MAX_YRES              768
-  
-  #define VBE_DISPI_IOPORT_INDEX          0x01CE
-  #define VBE_DISPI_IOPORT_DATA           0x01CF
-  
-  #define VBE_DISPI_INDEX_ID              0x0
-  #define VBE_DISPI_INDEX_XRES            0x1
-  #define VBE_DISPI_INDEX_YRES            0x2
-  #define VBE_DISPI_INDEX_BPP             0x3
-  #define VBE_DISPI_INDEX_ENABLE          0x4
-  #define VBE_DISPI_INDEX_BANK            0x5
-  #define VBE_DISPI_INDEX_VIRT_WIDTH      0x6
-  #define VBE_DISPI_INDEX_VIRT_HEIGHT     0x7
-  #define VBE_DISPI_INDEX_X_OFFSET        0x8
-  #define VBE_DISPI_INDEX_Y_OFFSET        0x9
-      
-  #define VBE_DISPI_ID0                   0xB0C0
-  #define VBE_DISPI_ID1                   0xB0C1
-  #define VBE_DISPI_ID2                   0xB0C2
-  #define VBE_DISPI_ID3                   0xB0C3
-  #define VBE_DISPI_ID4                   0xB0C4
-  
-  #define VBE_DISPI_DISABLED              0x00
-  #define VBE_DISPI_ENABLED               0x01
-  #define VBE_DISPI_GETCAPS               0x02
-  #define VBE_DISPI_8BIT_DAC              0x20
-  #define VBE_DISPI_LFB_ENABLED           0x40
-  #define VBE_DISPI_NOCLEARMEM            0x80
-  
-  #define VBE_DISPI_LFB_PHYSICAL_ADDRESS  0xE0000000
+  #define VBE_DISPI_BANK_ADDRESS           0xA0000
+  #define VBE_DISPI_BANK_SIZE_KB           64
+
+  #define VBE_DISPI_MAX_XRES               2560
+  #define VBE_DISPI_MAX_YRES               1600
+
+  #define VBE_DISPI_IOPORT_INDEX           0x01CE
+  #define VBE_DISPI_IOPORT_DATA            0x01CF
+
+  #define VBE_DISPI_INDEX_ID               0x0
+  #define VBE_DISPI_INDEX_XRES             0x1
+  #define VBE_DISPI_INDEX_YRES             0x2
+  #define VBE_DISPI_INDEX_BPP              0x3
+  #define VBE_DISPI_INDEX_ENABLE           0x4
+  #define VBE_DISPI_INDEX_BANK             0x5
+  #define VBE_DISPI_INDEX_VIRT_WIDTH       0x6
+  #define VBE_DISPI_INDEX_VIRT_HEIGHT      0x7
+  #define VBE_DISPI_INDEX_X_OFFSET         0x8
+  #define VBE_DISPI_INDEX_Y_OFFSET         0x9
+  #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
+
+  #define VBE_DISPI_ID0                    0xB0C0
+  #define VBE_DISPI_ID1                    0xB0C1
+  #define VBE_DISPI_ID2                    0xB0C2
+  #define VBE_DISPI_ID3                    0xB0C3
+  #define VBE_DISPI_ID4                    0xB0C4
+  #define VBE_DISPI_ID5                    0xB0C5
+
+  #define VBE_DISPI_DISABLED               0x00
+  #define VBE_DISPI_ENABLED                0x01
+  #define VBE_DISPI_GETCAPS                0x02
+  #define VBE_DISPI_8BIT_DAC               0x20
+  #define VBE_DISPI_LFB_ENABLED            0x40
+  #define VBE_DISPI_NOCLEARMEM             0x80
+
+  #define VBE_DISPI_LFB_PHYSICAL_ADDRESS   0xE0000000
 
 #endif
diff --git a/vbetables-gen.c b/vbetables-gen.c
index 7014a16..550935a 100644
--- a/vbetables-gen.c
+++ b/vbetables-gen.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#define VBE_DISPI_TOTAL_VIDEO_MEMORY_MB 8
+#define VBE_DISPI_TOTAL_VIDEO_MEMORY_MB 16
 
 typedef struct {
     int width;
@@ -41,20 +41,41 @@ ModeInfo modes[] = {
 { 1600, 1200, 16                      , 0x11E},
 { 1600, 1200, 24                      , 0x11F},
 
-      /* BOCHS/PLE, 86 'own' mode numbers */
-{ 320, 200, 32                        , 0x140},
-{ 640, 400, 32                        , 0x141},
-{ 640, 480, 32                        , 0x142},
-{ 800, 600, 32                        , 0x143},
-{ 1024, 768, 32                       , 0x144},
-{ 1280, 1024, 32                      , 0x145},
-{ 320, 200, 8                           , 0x146},
-{ 1600, 1200, 32                      , 0x147},
-{ 1152, 864, 8                      , 0x148},
+      /* BOCHS/PLEX86 'own' mode numbers */
+{ 320, 200, 32                       , 0x140},
+{ 640, 400, 32                       , 0x141},
+{ 640, 480, 32                       , 0x142},
+{ 800, 600, 32                       , 0x143},
+{ 1024, 768, 32                      , 0x144},
+{ 1280, 1024, 32                     , 0x145},
+{ 320, 200, 8                        , 0x146},
+{ 1600, 1200, 32                     , 0x147},
+{ 1152, 864, 8                       , 0x148},
 { 1152, 864, 15                      , 0x149},
 { 1152, 864, 16                      , 0x14a},
 { 1152, 864, 24                      , 0x14b},
 { 1152, 864, 32                      , 0x14c},
+{ 1280, 800, 16                      , 0x178},
+{ 1280, 800, 24                      , 0x179},
+{ 1280, 800, 32                      , 0x17a},
+{ 1280, 960, 16                      , 0x17b},
+{ 1280, 960, 24                      , 0x17c},
+{ 1280, 960, 32                      , 0x17d},
+{ 1440, 900, 16                      , 0x17e},
+{ 1440, 900, 24                      , 0x17f},
+{ 1440, 900, 32                      , 0x180},
+{ 1400, 1050, 16                     , 0x181},
+{ 1400, 1050, 24                     , 0x182},
+{ 1400, 1050, 32                     , 0x183},
+{ 1680, 1050, 16                     , 0x184},
+{ 1680, 1050, 24                     , 0x185},
+{ 1680, 1050, 32                     , 0x186},
+{ 1920, 1200, 16                     , 0x187},
+{ 1920, 1200, 24                     , 0x188},
+{ 1920, 1200, 32                     , 0x189},
+{ 2560, 1600, 16                     , 0x18a},
+{ 2560, 1600, 24                     , 0x18b},
+{ 2560, 1600, 32                     , 0x18c},
 { 0, },
 };