107 lines
1.7 KiB
C
107 lines
1.7 KiB
C
#include "vga_terminal.h"
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#include "paging.h"
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#include "os.h"
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#include "io.h"
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static u8 s_cCurAttr = DEFAULT_COLOR;
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u32 s_iX;
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u32 s_iY;
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void vga_terminal_init()
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{
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//Map 0xB8000 to 0xC100B8000
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page_map(OS_VIDEO_BUFFER,0x000B8000,80*25,PAGE_TABLE_READWRITE);
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}
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void update_cursor()
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{
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u16 pos;
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pos = s_iY * 80 + s_iX;
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outb(0x3D4, 0x0F);
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outb(0x3D5, (u8) (pos & 0xFF));
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outb(0x3D4, 0x0E);
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outb(0x3D5, (u8) ((pos >> 8) & 0xFF));
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}
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void cls()
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{
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u32 i;
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for(i = 0; i < SCR_CHARS*SCR_LINES; i++)
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SCR_TEXT_BUF[i] = SCR_ENTRY(0,DEFAULT_COLOR);
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s_iX = s_iY = 0;
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update_cursor();
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}
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void shiftscreen();
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void printchar(unsigned char c)
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{
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if(c == '\n' || c == '\r' || c == '\t' || c == '\b') // Control characters
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{
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if(c == '\r') s_iX = 0;
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else if(c == '\n') s_iX = SCR_CHARS;
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else if(c == '\t') s_iX = (s_iX + 8) & ~7;
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else if(c == '\b')
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{
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if(s_iX) s_iX--;
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else if(s_iY)
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{
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s_iY--;
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s_iX = SCR_CHARS-1;
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}
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//Remove character
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SCR_TEXT_BUF[s_iY*SCR_CHARS+s_iX] = SCR_ENTRY(0,s_cCurAttr);
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}
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}
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else // Text characters
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SCR_TEXT_BUF[s_iY*SCR_CHARS+s_iX++] = SCR_ENTRY(c,s_cCurAttr);
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if(s_iX > SCR_CHARS-1)
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{
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s_iX = 0;
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if(s_iY < SCR_LINES-1)
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s_iY++;
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else shiftscreen();
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}
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update_cursor();
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}
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void shiftscreen()
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{
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//cls();
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u32 x,y;
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for(y = 1; y < SCR_LINES; y++)
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{
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for(x = 0; x < SCR_CHARS; x++)
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{
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SCR_TEXT_BUF[(y-1)*SCR_CHARS+x]
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= SCR_TEXT_BUF[y*SCR_CHARS+x];
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}
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}
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for(x = 0; x < SCR_CHARS; x++)
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{
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SCR_TEXT_BUF[(SCR_LINES-1)*SCR_CHARS+x]
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= SCR_ENTRY(0,DEFAULT_COLOR);
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}
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}
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void chg_color(u8 color)
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{
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s_cCurAttr = color;
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}
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void print(const char* str)
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{
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while(*str) printchar(*str++);
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}
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void move_to_next_char(){}
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void move_to_next_line(){}
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void locate(int h, int w)
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{
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s_iX = w;
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s_iY = h;
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}
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