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nuclear@0
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1 #include <string.h>
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nuclear@0
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2 #include "vid.h"
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nuclear@35
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3 #include "intr.h"
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nuclear@2
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4 #include "asmops.h"
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nuclear@2
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5
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nuclear@2
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6 /* height of our virtual console text buffer */
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nuclear@12
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7 #define VIRT_HEIGHT 200
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nuclear@2
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8
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nuclear@2
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9 /* CRTC ports */
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nuclear@2
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10 #define CRTC_ADDR 0x3d4
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nuclear@2
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11 #define CRTC_DATA 0x3d5
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12
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nuclear@2
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13 /* CRTC registers */
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nuclear@2
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14 #define CRTC_START_HIGH 0xc
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nuclear@2
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15 #define CRTC_START_LOW 0xd
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nuclear@2
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16 #define CRTC_CURSOR_HIGH 0xe
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nuclear@2
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17 #define CRTC_CURSOR_LOW 0xf
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18
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nuclear@2
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19 /* construct a character with its attributes */
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nuclear@2
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20 #define VMEM_CHAR(c, fg, bg) \
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21 ((uint16_t)(c) | (((uint16_t)(fg) & 0xf) << 8) | (((uint16_t)(bg) & 0xf) << 12))
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nuclear@2
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22
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nuclear@2
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23 static void set_start_line(int line);
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nuclear@0
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24
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nuclear@0
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25 static uint16_t *vmem = (uint16_t*)0xb8000;
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nuclear@2
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26 static int start_line;
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nuclear@0
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27
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nuclear@2
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28
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nuclear@2
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29 void clear_scr(void)
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nuclear@0
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30 {
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31 int istate = get_intr_state();
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32 disable_intr();
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33
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nuclear@2
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34 memset16(vmem, VMEM_CHAR(' ', LTGRAY, BLACK), WIDTH * HEIGHT);
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nuclear@2
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35 start_line = 0;
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nuclear@2
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36 set_start_line(0);
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nuclear@2
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37 set_cursor(0, 0);
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38
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nuclear@35
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39 set_intr_state(istate);
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nuclear@0
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40 }
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nuclear@0
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41
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nuclear@1
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42 void set_char(char c, int x, int y, int fg, int bg)
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nuclear@0
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43 {
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nuclear@2
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44 vmem[(y + start_line) * WIDTH + x] = VMEM_CHAR(c, fg, bg);
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nuclear@2
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45 }
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nuclear@2
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46
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nuclear@2
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47 void set_cursor(int x, int y)
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nuclear@2
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48 {
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nuclear@2
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49 int loc;
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nuclear@35
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50 int istate = get_intr_state();
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nuclear@35
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51 disable_intr();
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nuclear@2
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52
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nuclear@2
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53 if(x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT) {
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nuclear@2
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54 loc = 0xffff;
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nuclear@2
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55 } else {
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nuclear@2
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56 loc = (y + start_line) * WIDTH + x;
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nuclear@2
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57 }
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nuclear@2
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58
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nuclear@2
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59 outb(CRTC_CURSOR_LOW, CRTC_ADDR);
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nuclear@2
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60 outb(loc, CRTC_DATA);
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nuclear@2
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61 outb(CRTC_CURSOR_HIGH, CRTC_ADDR);
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nuclear@2
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62 outb(loc >> 8, CRTC_DATA);
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63
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nuclear@35
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64 set_intr_state(istate);
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nuclear@0
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65 }
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nuclear@0
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66
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nuclear@1
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67 void scroll_scr(void)
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nuclear@0
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68 {
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nuclear@35
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69 int new_line, istate = get_intr_state();
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nuclear@35
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70 disable_intr();
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71
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nuclear@2
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72 if(++start_line > VIRT_HEIGHT - HEIGHT) {
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nuclear@2
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73 /* The bottom of the visible range reached the end of our text buffer.
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nuclear@2
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74 * Copy the rest of the lines to the top and reset start_line.
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75 */
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nuclear@12
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76 memcpy(vmem, vmem + start_line * WIDTH, (HEIGHT - 1) * WIDTH * 2);
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nuclear@2
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77 start_line = 0;
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nuclear@2
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78 }
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nuclear@2
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79
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nuclear@2
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80 /* clear the next line that will be revealed by scrolling */
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nuclear@35
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81 new_line = start_line + HEIGHT - 1;
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nuclear@2
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82 memset16(vmem + new_line * WIDTH, VMEM_CHAR(' ', LTGRAY, BLACK), WIDTH);
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nuclear@35
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83 set_start_line(start_line);
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nuclear@2
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84
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nuclear@35
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85 set_intr_state(istate);
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nuclear@0
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86 }
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nuclear@2
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87
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nuclear@2
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88 static void set_start_line(int line)
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nuclear@2
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89 {
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nuclear@2
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90 int start_addr = line * WIDTH;
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nuclear@2
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91
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nuclear@2
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92 outb(CRTC_START_LOW, CRTC_ADDR);
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nuclear@2
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93 outb(start_addr & 0xff, CRTC_DATA);
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nuclear@2
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94 outb(CRTC_START_HIGH, CRTC_ADDR);
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nuclear@2
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95 outb((start_addr >> 8) & 0xff, CRTC_DATA);
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nuclear@2
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96 }
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