Usermode/libc - Fix strchr and strrchr behavior
[tpg/acess2.git] / 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 // === PROTOTYPES ===
56 void    KernelPanic_SetMode(void);
57 void    KernelPanic_PutChar(char Ch);
58
59 // === CODE ===
60 /**
61  * \brief Sets the screen mode for a kernel panic
62  */
63 void KernelPanic_SetMode(void)
64 {
65          int    i;
66         
67         // This function is called by Panic(), but MM_PageFault and the
68         // CPU exception handers also call it, so let's not clear the screen
69         // twice
70         if( giKP_Pos )  return ;
71         
72         // Restore VGA 0xB8000 text mode
73         #if 0
74         for( i = 0; i < NUM_REGVALUES; i++ )
75         {
76                 // Reset Flip-Flop
77                 if( caRegValues[i].IdxPort == 0x3C0 )   inb(0x3DA);
78                 
79                 if( caRegValues[i].IdxPort )
80                         outb(caRegValues[i].IdxPort, caRegValues[i].Index);
81                 outb(caRegValues[i].DatPort, caRegValues[i].Value);
82         }
83         
84         inb(0x3DA);
85         outb(0x3C0, 0x20);
86         #endif
87         
88         // Clear Screen
89         for( i = 0; i < 80*25; i++ )
90         {
91                 FB[i] = BGC;
92         }
93 }
94
95 void KernelPanic_PutChar(char Ch)
96 {
97         if( giKP_Pos > 80*25 )  return ;
98         switch(Ch)
99         {
100         case '\t':
101                 do {
102                         FB[giKP_Pos] &= 0xFF00;
103                         FB[giKP_Pos++] |= ' ';
104                 } while(giKP_Pos & 7);
105                 break;
106         
107         case '\n':
108                 giKP_Pos += 80;
109         case '\r':
110                 giKP_Pos -= giKP_Pos % 80;
111                 break;
112         
113         default:
114                 if(' ' <= Ch && Ch < 0x7F)
115                 {
116                         FB[giKP_Pos] &= 0xFF00;
117                         FB[giKP_Pos] |= Ch;
118                 }
119                 giKP_Pos ++;
120                 break;
121         }
122 }

UCC git Repository :: git.ucc.asn.au