Kernel/arch/x86/kpanic.c

   1 /*
   2  * Acess 2 Kernel
   3  * By John Hodge (thePowersGang)
   4  * - x86 Kernel Panic Handler
   5  */
   6
   7 #include <acess.h>
   8
   9 #define FB      ((Uint16 *)(KERNEL_BASE|0xB8000))
  10 #define BGC     0x4F00  // White on Red
  11 //#define BGC   0xC000  // Black on Bright Red
  12 //#define BGC   0x1F00  // White on Blue (BSOD!)
  13
  14  int    giKP_Pos = 0;
  15
  16 const struct {
  17         Uint16  IdxPort;
  18         Uint16  DatPort;
  19         Uint8   Index;
  20         Uint8   Value;
  21 }       caRegValues[] = {
  22         //{0x3C0, 0x3C0, 0x10, 0x0C},   // Mode Control (Blink Enabled)
  23         {0x3C0, 0x3C0, 0x10, 0x04},     // Mode Control (Blink Disabled)
  24         {0x3C0, 0x3C0, 0x11, 0x00},     // Overscan Register
  25         {0x3C0, 0x3C0, 0x12, 0x0F},     // Color Plane Enable
  26         {0x3C0, 0x3C0, 0x13, 0x08},     // Horizontal Panning
  27         {0x3C0, 0x3C0, 0x14, 0x00},     // Color Select
  28         {0    , 0x3C2, 0   , 0x67},     // Miscellaneous Output Register
  29         {0x3C4, 0x3C5, 0x01, 0x00},     // Clock Mode Register
  30         {0x3C4, 0x3C5, 0x03, 0x00},     // Character select
  31         {0x3C4, 0x3C5, 0x04, 0x07},     // Memory Mode Register
  32         {0x3CE, 0x3CF, 0x05, 0x10},     // Mode Register
  33         {0x3CE, 0x3CF, 0x06, 0x0E},     // Miscellaneous Register
  34         {0x3D4, 0x3D5, 0x00, 0x5F},     // Horizontal Total
  35         {0x3D4, 0x3D5, 0x01, 0x4F},     // Horizontal Display Enable End
  36         {0x3D4, 0x3D5, 0x02, 0x50},     // Horizontal Blank Start
  37         {0x3D4, 0x3D5, 0x03, 0x82},     // Horizontal Blank End
  38         {0x3D4, 0x3D5, 0x04, 0x55},     // Horizontal Retrace Start
  39         {0x3D4, 0x3D5, 0x05, 0x81},     // Horizontal Retrace End
  40         {0x3D4, 0x3D5, 0x06, 0xBF},     // Vertical Total
  41         {0x3D4, 0x3D5, 0x07, 0x1F},     // Overflow Register
  42         {0x3D4, 0x3D5, 0x08, 0x00},     // Preset row scan
  43         {0x3D4, 0x3D5, 0x09, 0x4F},     // Maximum Scan Line
  44         {0x3D4, 0x3D5, 0x10, 0x9C},     // Vertical Retrace Start
  45         {0x3D4, 0x3D5, 0x11, 0x8E},     // Vertical Retrace End
  46         {0x3D4, 0x3D5, 0x12, 0x8F},     // Vertical Display Enable End
  47         {0x3D4, 0x3D5, 0x13, 0x28},     // Logical Width
  48         {0x3D4, 0x3D5, 0x14, 0x1F},     // Underline Location
  49         {0x3D4, 0x3D5, 0x15, 0x96},     // Vertical Blank Start
  50         {0x3D4, 0x3D5, 0x16, 0xB9},     // Vertical Blank End
  51         {0x3D4, 0x3D5, 0x17, 0xA3}      // CRTC Mode Control
  52 };
  53 #define NUM_REGVALUES   (sizeof(caRegValues)/sizeof(caRegValues[0]))
  54
  55 /**
  56  * \brief Sets the screen mode for a kernel panic
  57  */
  58 void KernelPanic_SetMode()
  59 {
  60          int    i;
  61
  62         // Some routines call this function twice, let's avoid that, shall we?
  63         if( giKP_Pos )  return ;
  64
  65         // Restore VGA 0xB8000 text mode
  66         #if 1
  67         for( i = 0; i < NUM_REGVALUES; i++ )
  68         {
  69                 // Reset Flip-Flop
  70                 if( caRegValues[i].IdxPort == 0x3C0 )   inb(0x3DA);
  71
  72                 if( caRegValues[i].IdxPort )
  73                         outb(caRegValues[i].IdxPort, caRegValues[i].Index);
  74                 outb(caRegValues[i].DatPort, caRegValues[i].Value);
  75         }
  76
  77         inb(0x3DA);
  78         outb(0x3C0, 0x20);
  79         #endif
  80
  81         // Clear Screen
  82         for( i = 0; i < 80*25; i++ )
  83         {
  84                 FB[i] = BGC;
  85         }
  86 }
  87
  88 void KernelPanic_PutChar(char Ch)
  89 {
  90         if( giKP_Pos > 80*25 )  return ;
  91         switch(Ch)
  92         {
  93         case '\t':
  94                 do {
  95                         FB[giKP_Pos] &= 0xFF00;
  96                         FB[giKP_Pos++] |= ' ';
  97                 } while(giKP_Pos & 7);
  98                 break;
  99
 100         case '\n':
 101                 giKP_Pos += 80;
 102         case '\r':
 103                 giKP_Pos -= giKP_Pos % 80;
 104                 break;
 105
 106         default:
 107                 if(' ' <= Ch && Ch < 0x7F)
 108                 {
 109                         FB[giKP_Pos] &= 0xFF00;
 110                         FB[giKP_Pos] |= Ch;
 111                 }
 112                 giKP_Pos ++;
 113                 break;
 114         }
 115 }