108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
//kernel.c
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//08/13/03 Josh Holtrop
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//Holtrop's Operating System
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#define VXR video_mode.XResolution
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#define VYR video_mode.YResolution
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#include "k_defines.h"
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#include "lib/string.h"
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#include "lib/io.h"
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#include "functions.h"
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#include "video.h"
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#include "mm.h"
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#include "keyboard.h"
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void isr(dword num);
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void k_init();
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#include "keyboard.c"
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#include "mm.c"
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#include "functions.c"
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#include "video.c"
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dword timer = 0;
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dword index = 0;
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dword keepgoing = 1;
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dword addresses[256];
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void k_init()
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{
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remap_pics(0x20, 0x28);
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//set timer : 2e9c = 100hz
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outportb(0x43, 0x34);
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outportb(0x40, 0x9c); //lsb
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outportb(0x40, 0x2e); //msb
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video_init((ModeInfoBlock *) 0x90306);
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video_rectf(VXR*3/11, 0, VXR*4/11, VYR-1, 0x00000088); //test rectangles, draws "HOS"
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video_rectf(VXR*7/11, 0, VXR*8/11, VYR-1, 0x00000088);
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video_rectf(VXR/11, 0, VXR*2/11, VYR*2/5, 0x00000088);
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video_rectf(VXR/11, VYR*3/5, VXR*2/11, VYR-1, 0x00000088);
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video_rectf(VXR*5/11, VYR/5, VXR*6/11, VYR*4/5, 0x00000088);
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video_rectf(VXR*9/11, VYR/5, VXR-1, VYR*2/5, 0x00000088);
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video_rectf(VXR*8/11, VYR*3/5, VXR*10/11, VYR*4/5, 0x00000088);
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video_vert(10, 10, 16, 0x00ffff00); //should be yellow 'H'
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video_horiz(13, 10, 14, 0x00ffff00);
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video_vert(14, 10, 16, 0x00ffff00);
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mm_init();
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enable_ints();
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console_cls();
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printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
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dword key = 0;
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for (;;)
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{
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key = kbdWaitKey();
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putc(key);
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}
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}
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void isr(dword num)
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{
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switch(num)
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{
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case 0x20: // IRQ0 - timer interrupt
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timer++;
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(*(byte *)0xb8000)++;
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if ((timer%25)==0)
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{
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if (keepgoing)
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{
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addresses[index] = (dword) mm_palloc(256, KERNEL_PID);
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printf("Addr: 0x%x\tEntries:\t%d\n", addresses[index], mm_freeentries());
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if (addresses[index] == 0)
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{
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index = -1;
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keepgoing = 0;
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}
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index++;
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}
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else
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{
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printf("Freeing %x\t", addresses[index]);
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addresses[index] = mm_pfree((void *)addresses[index]);
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printf("Free:\t%d\tEntries:\t%d\n", addresses[index], mm_freeentries());
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if (addresses[index] != 0)
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{
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index = -1;
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keepgoing = 1;
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}
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index++;
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}
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}
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eoi();
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break;
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case 0x21: // IRQ1 - keyboard interrupt
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isr_keyboard(); //isr_keybard() takes care of calling eoi()
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break;
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}
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}
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