Import backup from 2003-12-22_2
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//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 "lib/string.h" //library string functions
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#include "lib/io.h" //library input/output functions
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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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void isr(dword num);
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void k_init();
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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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#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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dword *videoMode;
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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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remap_pics(0x20, 0x28);
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init_timer();
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mm_init();
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videoMode = (dword *)0x90002;
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if (*videoMode)
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video_init((ModeInfoBlock *) 0x90306);
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vmm_init();
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mouse_init();
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vmm_enable_paging();
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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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printf("HOS 0.12 - Kernel Size: %d kb\n", kernel_size()/1024);
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printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
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printf("Free memory: %d bytes\n", mm_freemem());
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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 *)(0xb8000))++;
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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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79
kernel.c
79
kernel.c
@ -1,21 +1,94 @@
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//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"
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#include "k_defines.h" //#DEFINE's for kernel
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#include "lib/string.h" //library string functions
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#include "lib/io.h" //library input/output functions
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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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void isr(dword num);
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void k_init();
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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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#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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dword *videoMode;
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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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mm_init();
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vmm_init();
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console_cls();
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remap_pics(0x20, 0x28);
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init_timer();
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videoMode = (dword *)0x90002;
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if (*videoMode)
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video_init((ModeInfoBlock *) 0x90306);
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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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printf("HOS 0.12 - Kernel Size: %d kb\n", kernel_size()/1024);
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printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
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printf("Free memory: %d bytes\n", mm_freemem());
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dword key = 0;
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for (;;)
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{
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(*(byte *)0xc00b8000)++;
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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 *)(0xb8000))++;
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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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26
vmm.c
26
vmm.c
@ -3,19 +3,12 @@
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// Author: Josh Holtrop
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// Date: 09/30/03
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PageDirectory *vmm_PDBR = 0;
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PageDirectory *vmm_PDBR = (PageDirectory *)0x104000;
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dword vmm_first_virtual_address = 0;
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void vmm_init()
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{
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if (!(vmm_PDBR = mm_palloc(1, PID_KERNEL)))
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{
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printf("ERROR! COULD NOT ALLOCATE PAGE FOR INITIAL PAGE DIRECTORY!!\n");
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halt();
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}
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vmm_init_pagetable((dword)vmm_PDBR);
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if (mm_totalmem % 4096)
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vmm_first_virtual_address = mm_totalmem + (4096 - (mm_totalmem % 4096));
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else
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@ -24,7 +17,7 @@ void vmm_init()
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if (vmm_mapn(0, 0, 0x03, mm_totalmem/4096+1))
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{
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printf("Could not page in all physical RAM!\n");
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halt();
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//halt();
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}
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//we also need to map in the video framebuffer memory:
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if (video_mode.PhysBasePtr > 0 && video_mode.BitsPerPixel > 0)
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@ -38,13 +31,6 @@ void vmm_init()
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}
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void vmm_enable_paging()
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{
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write_cr3((dword)vmm_PDBR);
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write_cr0(0x80000000|read_cr0());
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}
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int vmm_map1(dword virtual, dword physical, dword flags)
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{
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if (virtual & 0x00000FFF)
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@ -72,17 +58,11 @@ int vmm_map1(dword virtual, dword physical, dword flags)
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int vmm_mapn(dword virtual, dword physical, dword flags, dword n)
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{
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int mapped;
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int result = 0;
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dword va = virtual;
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dword pa = physical;
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for (mapped = 0; mapped < n; mapped++)
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{
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if (result = vmm_map1(va, pa, flags))
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{
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if (mapped > 0)
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vmm_unmapn(virtual, mapped);
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return result;
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}
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vmm_map1(va, pa, flags);
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va += 4096;
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pa += 4096;
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}
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