99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
//kernel.c
|
|
//08/13/03 Josh Holtrop
|
|
//Holtrop's Operating System
|
|
//Version: 0.12
|
|
//Modified: 11/12/03
|
|
|
|
#include "k_defines.h" //#DEFINE's for kernel
|
|
|
|
#include "lib/string.h" //library string functions
|
|
#include "lib/io.h" //library input/output functions
|
|
|
|
#include "functions.h" //general functions
|
|
#include "video.h" //video functions
|
|
#include "mm.h" //physical memory management functions
|
|
#include "vmm.h" //virtual memory management & paging functions
|
|
#include "keyboard.h" //generic keyboard driver & functions
|
|
#include "mouse.h" //generic ps/2 mouse driver & functions
|
|
#include "fdc.h" //Floppy Disk Controller functions
|
|
#include "stdfont.h" //Standard font bitmask array
|
|
|
|
void isr(dword num);
|
|
void k_init();
|
|
extern dword write_cr0(dword cr0);
|
|
extern dword read_cr0();
|
|
extern dword write_cr3(dword cr3);
|
|
extern dword read_cr3();
|
|
|
|
#include "fdc.c"
|
|
#include "mouse.c"
|
|
#include "keyboard.c"
|
|
#include "mm.c"
|
|
#include "vmm.c"
|
|
#include "functions.c"
|
|
#include "video.c"
|
|
|
|
dword timer = 0;
|
|
dword *videoMode;
|
|
|
|
//Main kernel initialization method
|
|
void k_init()
|
|
{
|
|
// ===== Initialization
|
|
fdc_sendDOR(0x0C); //turn off floppy motor!!
|
|
console_cls();
|
|
remap_pics(0x20, 0x28);
|
|
init_timer();
|
|
mm_init();
|
|
videoMode = (dword *)0x90002;
|
|
if (*videoMode)
|
|
video_init((ModeInfoBlock *) 0x90306);
|
|
vmm_init();
|
|
mouse_init();
|
|
vmm_enable_paging();
|
|
pic1_mask(0); //unmask IRQ's 0-7
|
|
pic2_mask(0); //unmask IRQ's 8-15
|
|
enable_ints();
|
|
kbd_resetLEDs(); //after enabling interrupts!!
|
|
|
|
printf("HOS 0.12 - Kernel Size: %d kb\n", kernel_size()/1024);
|
|
printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
|
|
printf("Free memory: %d bytes\n", mm_freemem());
|
|
|
|
dword key = 0;
|
|
for (;;)
|
|
{
|
|
key = kbdWaitKey();
|
|
// if (((key & 0xFF00) >> 8) != 2) //key is not a control key
|
|
putc(key);
|
|
}
|
|
}
|
|
|
|
// main Interrupt Service Routine - handles all interrupts unless caught by kernel.asm
|
|
void isr(dword num)
|
|
{
|
|
switch(num)
|
|
{
|
|
case 0x20: // IRQ0 - timer interrupt
|
|
timer++;
|
|
(*(byte *)(0xb8000))++;
|
|
eoi();
|
|
break;
|
|
case 0x21: // IRQ1 - keyboard interrupt
|
|
isr_keyboard(); //isr_keybard() takes care of calling eoi()
|
|
break;
|
|
case 0x2C: // IRQ12 - PS/2 mouse
|
|
isr_mouse();
|
|
eoi2();
|
|
break;
|
|
default:
|
|
printf("Interrupt %d (0x%x) Unhandled!!\n", num, num);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|