Kernel/drv/vterm.c

   1 /*
   2  * Acess2 Virtual Terminal Driver
   3  */
   4 #include <common.h>
   5 #include <fs_devfs.h>
   6 #include <modules.h>
   7 #include <tpl_drv_video.h>
   8 #include <tpl_drv_keyboard.h>
   9
  10 // === CONSTANTS ===
  11 #define NUM_VTS 4
  12 #define MAX_INPUT_CHARS 64
  13 #define VT_SCROLLBACK   4       // 4 Screens of text
  14 #define DEFAULT_OUTPUT  "/Devices/VGA"
  15 #define DEFAULT_INPUT   "/Devices/PS2Keyboard"
  16 #define DEFAULT_WIDTH   80
  17 #define DEFAULT_HEIGHT  25
  18 #define DEFAULT_COLOUR  (VT_COL_BLACK|(VT_COL_WHITE<<16))
  19
  20 enum eVT_Modes {
  21         VT_MODE_TEXT8,  // UTF-8 Text Mode (VT100 Emulation)
  22         VT_MODE_TEXT32, // UTF-32 Text Mode (Acess Native)
  23         VT_MODE_8BPP,   // 256 Colour Mode
  24         VT_MODE_16BPP,  // 16 bit Colour Mode
  25         VT_MODE_24BPP,  // 24 bit Colour Mode
  26         VT_MODE_32BPP,  // 32 bit Colour Mode
  27         NUM_VT_MODES
  28 };
  29
  30 // === TYPES ===
  31 typedef struct {
  32          int    Mode;
  33          int    Width, Height;
  34          int    ViewPos, WritePos;
  35         Uint32  CurColour;
  36         char    Name[2];
  37          int    InputRead;
  38          int    InputWrite;
  39         Uint32  InputBuffer[MAX_INPUT_CHARS];
  40         union {
  41                 tVT_Char        *Text;
  42                 Uint32          *Buffer;
  43         };
  44         tVFS_Node       Node;
  45 } tVTerm;
  46
  47 // === PROTOTYPES ===
  48  int    VT_Install(char **Arguments);
  49 char    *VT_ReadDir(tVFS_Node *Node, int Pos);
  50 tVFS_Node       *VT_FindDir(tVFS_Node *Node, char *Name);
  51 Uint64  VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  52 Uint64  VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  53  int    VT_IOCtl(tVFS_Node *Node, int Id, void *Data);
  54 void    VT_KBCallBack(Uint32 Codepoint);
  55 void    VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count);
  56  int    VT_int_ParseEscape(tVTerm *Term, char *Buffer);
  57 void    VT_int_PutChar(tVTerm *Term, Uint32 Ch);
  58 void    VT_int_UpdateScreen( tVTerm *Term, int UpdateAll );
  59
  60 // === CONSTANTS ===
  61 const Uint16    caVT100Colours[] = {
  62                 VT_COL_BLACK, 0, 0, 0, 0, 0, 0, VT_COL_LTGREY,
  63                 VT_COL_GREY, 0, 0, 0, 0, 0, 0, VT_COL_WHITE
  64         };
  65
  66 // === GLOBALS ===
  67 MODULE_DEFINE(0, 0x0032, VTerm, VT_Install, NULL, NULL);
  68 tDevFS_Driver   gVT_DrvInfo = {
  69         NULL, "VTerm",
  70         {
  71         .Flags = VFS_FFLAG_DIRECTORY,
  72         .Inode = -1,
  73         .NumACLs = 0,
  74         .ReadDir = VT_ReadDir,
  75         .FindDir = VT_FindDir
  76         }
  77 };
  78 tVTerm  gVT_Terminals[NUM_VTS];
  79 char    *gsVT_OutputDevice = NULL;
  80 char    *gsVT_InputDevice = NULL;
  81  int    giVT_OutputDevHandle = -2;
  82  int    giVT_InputDevHandle = -2;
  83  int    giVT_CurrentTerminal = 0;
  84
  85 // === CODE ===
  86 /**
  87  * \fn int VT_Install(char **Arguments)
  88  */
  89 int VT_Install(char **Arguments)
  90 {
  91         char    **args = Arguments;
  92         char    *arg;
  93          int    i;
  94
  95         // Scan Arguments
  96         if(Arguments)
  97         {
  98                 for( ; (arg = *args); args++ )
  99                 {
 100                         if(arg[0] != '-')       continue;
 101
 102                         switch(arg[1])
 103                         {
 104                         // Set output device
 105                         case 'o':
 106                                 if(args[1] ==  NULL)    break;
 107                                 if(gsVT_OutputDevice)   free(gsVT_OutputDevice);
 108                                 gsVT_OutputDevice = malloc(strlen(args[1])+1);
 109                                 strcpy(gsVT_OutputDevice, args[1]);
 110                                 args ++;
 111                                 break;
 112
 113                         // Set input device
 114                         case 'i':
 115                                 if(args[1] == NULL)     break;
 116                                 if(gsVT_InputDevice)    free(gsVT_InputDevice);
 117                                 gsVT_InputDevice = malloc(strlen(args[1])+1);
 118                                 strcpy(gsVT_InputDevice, args[1]);
 119                                 args ++;
 120                                 break;
 121
 122                         }
 123                 }
 124         }
 125
 126         // Apply Defaults
 127         if(!gsVT_OutputDevice)  gsVT_OutputDevice = DEFAULT_OUTPUT;
 128         if(!gsVT_InputDevice)   gsVT_InputDevice = DEFAULT_INPUT;
 129
 130         LOG("Using '%s' as output", gsVT_OutputDevice);
 131         LOG("Using '%s' as input", gsVT_InputDevice);
 132
 133         // Create Nodes
 134         for( i = 0; i < NUM_VTS; i++ )
 135         {
 136                 gVT_Terminals[i].Mode = VT_MODE_TEXT8;
 137                 gVT_Terminals[i].Width = DEFAULT_WIDTH;
 138                 gVT_Terminals[i].Height = DEFAULT_HEIGHT;
 139                 gVT_Terminals[i].CurColour = DEFAULT_COLOUR;
 140                 gVT_Terminals[i].WritePos = 0;
 141                 gVT_Terminals[i].ViewPos = 0;
 142
 143                 gVT_Terminals[i].Buffer = malloc( DEFAULT_WIDTH*DEFAULT_HEIGHT*sizeof(tVT_Char) );
 144                 memset( gVT_Terminals[i].Buffer, 0, DEFAULT_WIDTH*DEFAULT_HEIGHT*sizeof(tVT_Char) );
 145
 146                 gVT_Terminals[i].Name[0] = '0'+i;
 147                 gVT_Terminals[i].Name[1] = '\0';
 148                 gVT_Terminals[i].Node.Inode = i;
 149                 gVT_Terminals[i].Node.NumACLs = 0;      // Only root can open virtual terminals
 150
 151                 gVT_Terminals[i].Node.Read = VT_Read;
 152                 gVT_Terminals[i].Node.Write = VT_Write;
 153                 gVT_Terminals[i].Node.IOCtl = VT_IOCtl;
 154         }
 155
 156         // Add to DevFS
 157         DevFS_AddDevice( &gVT_DrvInfo );
 158
 159         return 0;
 160 }
 161
 162 /**
 163  * \fn void VT_InitOutput()
 164  * \brief Initialise Video Output
 165  */
 166 void VT_InitOutput()
 167 {
 168         giVT_OutputDevHandle = VFS_Open(gsVT_OutputDevice, VFS_OPENFLAG_WRITE);
 169         LOG("giVT_OutputDevHandle = %x\n", giVT_OutputDevHandle);
 170 }
 171
 172 /**
 173  * \fn void VT_InitInput()
 174  * \brief Initialises the input
 175  */
 176 void VT_InitInput()
 177 {
 178         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
 179         LOG("giVT_InputDevHandle = %x\n", giVT_InputDevHandle);
 180         if(giVT_InputDevHandle == -1)   return ;
 181         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
 182 }
 183
 184 /**
 185  * \fn char *VT_ReadDir(tVFS_Node *Node, int Pos)
 186  * \brief Read from the VTerm Directory
 187  */
 188 char *VT_ReadDir(tVFS_Node *Node, int Pos)
 189 {
 190         if(Pos < 0)     return NULL;
 191         if(Pos >= NUM_VTS)      return NULL;
 192         return gVT_Terminals[Pos].Name;
 193 }
 194
 195 /**
 196  * \fn tVFS_Node *VT_FindDir(tVFS_Node *Node, char *Name)
 197  * \brief Find an item in the VTerm directory
 198  */
 199 tVFS_Node *VT_FindDir(tVFS_Node *Node, char *Name)
 200 {
 201          int    num;
 202
 203         //ENTER("pNode sName", Node, Name);
 204
 205         // Open the input and output files if needed
 206         if(giVT_OutputDevHandle == -2)  VT_InitOutput();
 207         if(giVT_InputDevHandle == -2)   VT_InitInput();
 208
 209         // Sanity check name
 210         if(Name[0] < '0' || Name[0] > '9' || Name[1] != '\0') {
 211                 LEAVE('n');
 212                 return NULL;
 213         }
 214         // Get index
 215         num = Name[0] - '0';
 216         if(num >= NUM_VTS) {
 217                 LEAVE('n');
 218                 return NULL;
 219         }
 220         // Return node
 221         //LEAVE('p', &gVT_Terminals[num].Node);
 222         return &gVT_Terminals[num].Node;
 223 }
 224
 225 /**
 226  * \fn Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 227  * \brief Read from a virtual terminal
 228  */
 229 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 230 {
 231          int    pos = 0;
 232         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 233
 234         // Check current mode
 235         switch(term->Mode)
 236         {
 237         case VT_MODE_TEXT8:
 238                 while(pos < Length)
 239                 {
 240                         while(term->InputRead == term->InputWrite)      Proc_Yield();
 241                         while(term->InputRead != term->InputWrite)
 242                         {
 243                                 LOG("WriteUTF8(%p, 0x%x)", Buffer+pos, term->InputBuffer[term->InputRead]);
 244                                 pos += WriteUTF8(Buffer+pos, term->InputBuffer[term->InputRead]);
 245                                 term->InputRead ++;
 246                         }
 247                 }
 248                 break;
 249
 250         case VT_MODE_TEXT32:
 251                 while(pos < Length)
 252                 {
 253                         while(term->InputRead == term->InputWrite)      Proc_Yield();
 254                         while(term->InputRead != term->InputWrite)
 255                         {
 256                                 ((Uint32*)Buffer)[pos] = term->InputBuffer[term->InputRead];
 257                                 pos ++;
 258                                 term->InputRead ++;
 259                         }
 260                 }
 261                 break;
 262         }
 263         return 0;
 264 }
 265
 266 /**
 267  * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 268  * \brief Write to a virtual terminal
 269  */
 270 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 271 {
 272         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 273
 274         //ENTER("pNode XOffset XLength pBuffer",  Node, Offset, Length, Buffer);
 275
 276         // Write
 277         switch( term->Mode )
 278         {
 279         case VT_MODE_TEXT8:
 280                 VT_int_PutString(term, Buffer, Length);
 281                 break;
 282         case VT_MODE_TEXT32:
 283                 //VT_int_PutString32(term, Buffer, Length);
 284                 break;
 285         }
 286         //LEAVE('i', 0);
 287         return 0;
 288 }
 289
 290 /**
 291  * \fn int VT_IOCtl(tVFS_Node *Node, int Id, void *Data)
 292  * \brief Call an IO Control on a virtual terminal
 293  */
 294 int VT_IOCtl(tVFS_Node *Node, int Id, void *Data)
 295 {
 296         return 0;
 297 }
 298
 299 /**
 300  * \fn void VT_KBCallBack(Uint32 Codepoint)
 301  * \brief Called on keyboard interrupt
 302  */
 303 void VT_KBCallBack(Uint32 Codepoint)
 304 {
 305         tVTerm  *term = &gVT_Terminals[giVT_CurrentTerminal];
 306
 307         term->InputBuffer[ term->InputWrite ] = Codepoint;
 308         term->InputWrite ++;
 309         term->InputWrite %= MAX_INPUT_CHARS;
 310         if(term->InputRead == term->InputWrite) {
 311                 term->InputRead ++;
 312                 term->InputRead %= MAX_INPUT_CHARS;
 313         }
 314 }
 315
 316 /**
 317  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
 318  * \brief Print a string to the Virtual Terminal
 319  */
 320 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
 321 {
 322         Uint32  val;
 323          int    i;
 324         for( i = 0; i < Count; i++ )
 325         {
 326                 if( Buffer[i] == 0x1B ) // Escape Sequence
 327                 {
 328                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]);
 329                         continue;
 330                 }
 331
 332                 if( Buffer[i] < 128 )   // Plain ASCII
 333                         VT_int_PutChar(Term, Buffer[i]);
 334                 else {  // UTF-8
 335                         i += ReadUTF8(&Buffer[i], &val);
 336                         VT_int_PutChar(Term, val);
 337                 }
 338         }
 339 }
 340
 341 /**
 342  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 343  * \brief Parses a VT100 Escape code
 344  */
 345 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 346 {
 347         char    c;
 348          int    argc = 0, j = 1;
 349          int    args[4] = {0,0,0,0};
 350
 351         switch(Buffer[0]) {
 352         //Large Code
 353         case '[':
 354                 // Get Arguments
 355                 c = Buffer[1];
 356                 do {
 357                         while('0' <= c && c <= '9') {
 358                                 args[argc] *= 10;
 359                                 args[argc] += c-'0';
 360                                 c = Buffer[++j];
 361                         }
 362                         argc ++;
 363                 } while(c == ';');
 364
 365                 // Get string (what does this do?)
 366                 if(c == '"') {
 367                         c = Buffer[++j];
 368                         while(c != '"')
 369                                 c = Buffer[++j];
 370                 }
 371
 372                 // Get Command
 373                 if(     ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
 374                 {
 375                         switch(c) {
 376                         //Clear By Line
 377                         case 'J':
 378                                 // Clear Screen
 379                                 if(args[0] == 2) {
 380                                         memset(Term->Text, 0, Term->Width*Term->Height*VT_SCROLLBACK*sizeof(tVT_Char));
 381                                         Term->WritePos = 0;
 382                                         Term->ViewPos = 0;
 383                                 }
 384                                 break;
 385                         // Set Font flags
 386                         case 'm':
 387                                 for( ; argc--; )
 388                                 {
 389                                         // Flags
 390                                         if( 0 <= args[argc] && args[argc] <= 8)
 391                                         {
 392                                                 switch(args[argc])
 393                                                 {
 394                                                 case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
 395                                                 case 1: Term->CurColour |= 0x80000000;  break;  // Bright
 396                                                 case 2: Term->CurColour &= ~0x80000000; break;  // Dim
 397                                                 }
 398                                         }
 399                                         // Foreground Colour
 400                                         else if(30 <= args[argc] && args[argc] <= 37) {
 401                                                 Term->CurColour &= 0xF000FFFF;
 402                                                 Term->CurColour |= (Uint32)caVT100Colours[ args[argc]-30+(Term->CurColour>>28) ] << 16;
 403                                         }
 404                                         // Background Colour
 405                                         else if(40 <= args[argc] && args[argc] <= 47) {
 406                                                 Term->CurColour &= 0xFFFF8000;
 407                                                 Term->CurColour |= caVT100Colours[ args[argc]-40+((Term->CurColour>>12)&15) ];
 408                                         }
 409                                 }
 410                                 break;
 411                         }
 412                 }
 413                 break;
 414
 415         default:
 416                 break;
 417         }
 418
 419         return j + 1;
 420 }
 421
 422 /**
 423  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
 424  * \brief Write a single character to a VTerm
 425  */
 426 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
 427 {
 428          int    i;
 429         //ENTER("pTerm xCh", Term, Ch);
 430         //LOG("Term = {WritePos:%i, ViewPos:%i}\n", Term->WritePos, Term->ViewPos);
 431
 432         switch(Ch)
 433         {
 434         case '\n':
 435                 Term->WritePos += Term->Width;
 436         case '\r':
 437                 Term->WritePos -= Term->WritePos % Term->Width;
 438                 break;
 439
 440         case '\t':
 441                 do {
 442                         Term->Text[ Term->WritePos ].Ch = '\t';
 443                         Term->Text[ Term->WritePos ].Colour = Term->CurColour;
 444                         Term->WritePos ++;
 445                 } while(Term->WritePos & 7);
 446                 break;
 447
 448         case '\b':
 449                 // Backspace is invalid at Offset 0
 450                 if(Term->WritePos == 0) break;
 451
 452                 Term->WritePos --;
 453                 // Singe Character
 454                 if(Term->Text[ Term->WritePos ].Ch != '\t') {
 455                         Term->Text[ Term->WritePos ].Ch = 0;
 456                         Term->Text[ Term->WritePos ].Colour = Term->CurColour;
 457                         break;
 458                 }
 459                 // Tab
 460                 i = 7;  // Limit it to 8
 461                 do {
 462                         Term->Text[ Term->WritePos ].Ch = 0;
 463                         Term->Text[ Term->WritePos ].Colour = Term->CurColour;
 464                         Term->WritePos --;
 465                 } while(Term->WritePos && i-- && Term->Text[ Term->WritePos ].Ch == '\t');
 466                 break;
 467
 468         default:
 469                 Term->Text[ Term->WritePos ].Ch = Ch;
 470                 Term->Text[ Term->WritePos ].Colour = Term->CurColour;
 471                 Term->WritePos ++;
 472                 break;
 473         }
 474
 475         if(Term->WritePos >= Term->Width*Term->Height*VT_SCROLLBACK)
 476         {
 477                  int    base, i;
 478                 Term->WritePos -= Term->Width;
 479
 480                 // Update view position
 481                 base = Term->Width*Term->Height*(VT_SCROLLBACK-1);
 482                 if(Term->ViewPos < base)        Term->ViewPos += Term->Width;
 483                 if(Term->ViewPos > base)        Term->ViewPos = base;
 484
 485                 // Scroll terminal cache
 486                 base = Term->Width*(Term->Height*VT_SCROLLBACK-1);
 487
 488                 // Scroll Back
 489                 memcpy( Term->Text, &Term->Text[Term->Width], base*sizeof(tVT_Char) );
 490
 491                 // Clear last row
 492                 for( i = 0; i < Term->Width; i ++ )
 493                 {
 494                         Term->Text[ base + i ].Ch = 0;
 495                         Term->Text[ base + i ].Colour = Term->CurColour;
 496                 }
 497
 498                 VT_int_UpdateScreen( Term, 1 );
 499         }
 500         else
 501                 VT_int_UpdateScreen( Term, 0 );
 502
 503         //LEAVE('-');
 504 }
 505
 506 /**
 507  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
 508  * \brief Updates the video framebuffer
 509  */
 510 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
 511 {
 512         if(UpdateAll) {
 513                 VFS_WriteAt(
 514                         giVT_OutputDevHandle,
 515                         0,
 516                         Term->Width*Term->Height*sizeof(tVT_Char),
 517                         &Term->Text[Term->ViewPos]
 518                         );
 519         } else {
 520                  int    pos = Term->WritePos - Term->WritePos % Term->Width;
 521                 VFS_WriteAt(
 522                         giVT_OutputDevHandle,
 523                         (pos - Term->ViewPos)*sizeof(tVT_Char),
 524                         Term->Width*sizeof(tVT_Char),
 525                         &Term->Text[pos]
 526                         );
 527         }
 528 }
 529
 530 // ---
 531 // Font Render
 532 // ---
 533 #define MONOSPACE_FONT  10816
 534
 535 #if MONOSPACE_FONT == 10808     // 8x8
 536 # include "vterm_font_8x8.h"
 537 #elif MONOSPACE_FONT == 10816   // 8x16
 538 # include "vterm_font_8x16.h"
 539 #endif
 540
 541
 542 int VT_Font_GetWidth(Uint32 Codepoint)
 543 {
 544         return FONT_WIDTH;
 545 }
 546 int VT_Font_GetHeight(Uint32 Codepoint)
 547 {
 548         return FONT_HEIGHT;
 549 }
 550
 551 void VT_Font_Render(Uint32 Codepoint, void *Buffer, Uint32 BGC, Uint32 FGC)
 552 {
 553 //      Uint8   *font;
 554
 555 }
 556
 557 /**
 558  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
 559  * \brief Gets an index into the font array given a Unicode Codepoint
 560  * \note See http://en.wikipedia.org/wiki/CP437
 561  */
 562 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
 563 {
 564          int    index = 0;
 565         if(Codepoint < 128)
 566                 return &VTermFont[Codepoint*FONT_HEIGHT];
 567         switch(Codepoint)
 568         {
 569         case 0xC7:      index = 128;    break;  // Ç
 570         case 0xFC:      index = 129;    break;  // ü
 571         case 0xE9:      index = 130;    break;  // é
 572         case 0xE2:      index = 131;    break;  // â
 573         case 0xE4:      index = 132;    break;  // ä
 574         case 0xE0:      index = 133;    break;  // à
 575         case 0xE5:      index = 134;    break;  // å
 576         case 0xE7:      index = 135;    break;  // ç
 577         case 0xEA:      index = 136;    break;  // ê
 578         case 0xEB:      index = 137;    break;  // ë
 579         case 0xE8:      index = 138;    break;  // è
 580         case 0xEF:      index = 139;    break;  // ï
 581         case 0xEE:      index = 140;    break;  // î
 582         case 0xEC:      index = 141;    break;  // ì
 583         case 0xC4:      index = 142;    break;  // Ä
 584         case 0xC5:      index = 143;    break;  // Å
 585         }
 586
 587         return &VTermFont[index*FONT_HEIGHT];
 588 }