100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
// kernel.c
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// Author: Josh Holtrop
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// Date: 08/13/03
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// Holtrop's Operating System - Version 0.13
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// Modified: 03/08/04
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#include "hos_defines.h" //#DEFINE's for kernel
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#include "functions.h" //general functions
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#include "asmfuncs.h" //assembly functions
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#include "kio.h" //kernel input/output functions
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#include "mm/mm.h" //physical memory management functions
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#include "mm/vmm.h" //virtual memory management & paging functions
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#include "char/keyboard.h" //generic keyboard driver & functions
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#include "char/mouse.h" //generic ps/2 mouse driver & functions
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#include "block/fdc.h" //Floppy Disk Controller functions
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#include "string/string.h" //string functions
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#include "sys/cmos.h" //CMOS interface functions
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#include "sys/io.h" //port i/o functions
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#include "sys/pic.h" //Programmable Interrupt Controller functions
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#include "sys/rtc.h" //Real Time Clock functions
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#include "video/stdfont.h" //Standard font bitmask array
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#include "video/video.h" //video functions
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void isr(dword num);
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void k_init();
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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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kio_console_cls();
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video_init();
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mm_init();
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vmm_init();
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pic_remap(0x20, 0x28);
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timer_init();
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mouse_init();
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pic_mask1(0); //unmask IRQ's 0-7
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pic_mask2(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 (video_Mode())
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{
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int p = video_getWidth()*video_getHeight()-1;
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for (; p >= 0; p--)
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video_pseti(p, 0x00000066);
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kio_drawConsole();
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}
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printf("HOS 0.14 - Kernel File Size: %u kb\tData Size: %u bytes\n", kernel_size()>>10, (dword)(&_end)-(dword)(&_code));
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printf("Memory available to OS: %u MB (%u bytes)\n", mm_getTotalMegs(), mm_getTotalMem());
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printf("Free memory: %u bytes (%u pages)\n", mm_freemem(), mm_freemem()>>12);
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printf("%b/%b/%b\t%b:%b:%b\n", rtc_readMonth(), rtc_readDay(), rtc_readYear(), rtc_readHour(), rtc_readMinute(), rtc_readSecond());
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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 14:
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printf("Page fault, CR2 = 0x%x\n", read_cr2());
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halt();
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break;
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case 0x20: // IRQ0 - timer interrupt
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timer++;
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(*(byte *)(0xc00b8000))++;
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pic_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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pic_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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halt();
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break;
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}
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}
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