111 lines
2.6 KiB
C
111 lines
2.6 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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//Version: 0.12
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//Modified: 11/12/03
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#include "k_defines.h" //#DEFINE's for kernel
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#include "functions.h" //general functions
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#include "video.h" //video functions
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#include "mm.h" //physical memory management functions
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#include "vmm.h" //virtual memory management & paging functions
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#include "keyboard.h" //generic keyboard driver & functions
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#include "mouse.h" //generic ps/2 mouse driver & functions
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#include "fdc.h" //Floppy Disk Controller functions
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#include "stdfont.h" //Standard font bitmask array
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#include "kio.h"
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void isr(dword num);
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void k_init();
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/* These functions are defined in asmfuncs.asm */
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extern dword write_cr0(dword cr0);
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extern dword read_cr0();
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extern dword write_cr3(dword cr3);
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extern dword read_cr3();
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extern void writeCursorPosition(dword pos);
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extern dword getCursorPosition();
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extern void console_scroll();
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extern void console_cls();
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extern int puts(char *str);
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extern int putDec(int number);
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extern int putDecu(dword number);
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#include "kio.c"
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#include "fdc.c"
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#include "mouse.c"
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#include "keyboard.c"
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#include "mm.c"
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#include "vmm.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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//Main kernel initialization method
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void k_init()
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{
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// ===== Initialization
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fdc_sendDOR(0x0C); //turn off floppy motor!!
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console_cls();
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video_init();
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mm_init();
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vmm_init();
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remap_pics(0x20, 0x28);
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init_timer();
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mouse_init();
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pic1_mask(0); //unmask IRQ's 0-7
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pic2_mask(0); //unmask IRQ's 8-15
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enable_ints();
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kbd_resetLEDs(); //after enabling interrupts!!
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if (videoMode)
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{
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int p = video_mode.XResolution*video_mode.YResolution-1;
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for (; p >= 0; p--)
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video_psetp(p, 0x00000044);
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video_drawConsole();
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}
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printf("HOS 0.13 - Kernel Size: %u kb\n", kernel_size()>>10);
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printf("Memory available to OS: %u MB (Bytes: %u)\n", mm_megabytes, mm_totalmem);
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printf("Free memory: %u bytes (%u pages)\n", mm_freemem(), mm_freemem()>>12);
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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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if ((key & 0xFF) > 2) //key is not a control key
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putc(key);
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}
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}
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// main Interrupt Service Routine - handles all interrupts unless caught by kernel.asm
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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 *)(0xc00b8000))++;
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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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case 0x2C: // IRQ12 - PS/2 mouse
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isr_mouse();
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eoi2();
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break;
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default:
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printf("Interrupt %d (0x%x) Unhandled!!\n", num, num);
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break;
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}
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}
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