Import backup from 2003-12-22
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Copy of kernel.c
Normal file
98
Copy of kernel.c
Normal file
@ -0,0 +1,98 @@
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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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@ -6,7 +6,7 @@
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%define BOOT_KERNEL_SEG 0x0AC0 ;right after ROOT_DIR
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%define BOOT_STAGE2_SEG 0x0B00 ;right after KERNEL_SEG
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%define BOOT_STAGE2_ADD 0xB000 ;address of stage2 to jump to, org at
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%define BOOT_KERNEL_ADD 0x104000 ;final pmode kernel destination - physical
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%define BOOT_KERNEL_ADD 0x106000 ;final pmode kernel destination - physical
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%define BOOT_RD_ADD 0x200000 ;2mb for ram disk
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%define BOOT_DATA_SEG 0x9000 ;data gathered by stage2 loader goes here
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2
idt.inc
2
idt.inc
@ -5,7 +5,7 @@
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idtr:
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dw 50*8-1 ;size of idt
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dd IDT ;address of idt
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dd IDT_P ;address of idt
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%macro isr_label 1
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51
kernel.asm
51
kernel.asm
@ -2,10 +2,16 @@
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;Author: Josh Holtrop
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;Modified: 10/30/03
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%include "bootdef.inc"
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%define GDT 0x100000
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%define IDT 0x102000
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%define GDT_P 0x100000; ;1mb physical - Global Descriptor Table space
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%define GDT_V GDT_P+0xC0000000
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%define IDT_P 0x102000 ;1mb+8kb - Interrupt Descriptor Table space
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%define IDT_V IDT_P+0xC0000000
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%define PDBR_P 0x104000 ;1mb+16kb - Page Directory Base Register (first PD)
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%define PDBR_V PDBR_P+0xC0000000
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%define LOPT_P 0x105000 ;1mb+20kb - LOw Page Table for mapping first 4mb
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%define LOPT_V LOPT_P+0xC0000000
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%define KERNEL_P 0x106000 ;1mb+24kb - the kernel's physical address
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%define KERNEL_V KERNEL_P+0xC0000000 ;3gb+1mb+24kb, the virtual address of the kernel
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[global start]
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[extern _isr]
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@ -14,9 +20,36 @@
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bits 32
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;This is where the kernel begins execution
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;At this point, the temporary gdt is set up to "map" 0xC000_0000 to 0x0.
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;We must enable paging with the first 4mb mapped 1:1 virtual:physical
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; and with the 4mb starting at 0xC000_0000 mapped to the first 4mb physical.
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;Then we can start using our "real" gdt, then unmap the lower 4mb.
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start:
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cli ;if they weren't already off
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mov edi, GDT
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cli ;if they weren't already off
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xor eax, eax
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mov edi, PDBR_V
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mov ecx, 1024 ;clear the PDBR
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rep stosd
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mov [PDBR_V], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
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mov [PDBR_V+0xC00], dword LOPT_P|0x03 ;store the physical address of the LOw Page Table (read/write, present)
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mov edi, LOPT_V
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mov ecx, 1024
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mov eax, 0x03 ;starting physical address = 0x0 (read/write, present flags)
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fill_lopt_loop: ;fill the page table
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stosd
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add eax, 4096 ;increment next phsyical address by 4kb
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loop fill_lopt_loop
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mov eax, PDBR_P
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mov cr3, eax ;store the Page Directory Base Address
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mov eax, cr0
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or eax, 0x80000000 ;set page enable bit
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mov cr0, eax ;now paging is active!
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mov edi, GDT_V
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mov esi, gdt
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mov ecx, gdt_end-gdt
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copy_gdt:
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@ -24,7 +57,7 @@ copy_gdt:
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stosb
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loop copy_gdt
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mov edi, IDT ;destination
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mov edi, IDT_V ;destination
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mov esi, isr_0 ;address of isr0
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mov edx, isr_1-isr_0 ;distance between isr labels
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mov ecx, 50 ;number of isrlabels
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@ -42,7 +75,7 @@ fill_idt:
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mov esi, ebx
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add esi, edx
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loop fill_idt
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mov word [IDT+0x30*8+4], 0xEE00 ;interrupt 0x30 has user priviledges
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mov word [IDT_V+0x30*8+4], 0xEE00 ;interrupt 0x30 has user priviledges
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lgdt [gdtr] ;load gdt
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jmp KERNEL_CODE:newgdtcontinue
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@ -53,7 +86,7 @@ newgdtcontinue:
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mov gs, ax
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mov fs, ax
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mov ss, ax
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mov esp, 0x1ffffc ;stack just under 2mb, moves downward
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mov esp, 0xc01ffffc ;stack just under 2mb, moves downward
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lidt [idtr] ;load idt
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call _k_init
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96
kernel.c
96
kernel.c
@ -1,111 +1,21 @@
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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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#include "k_defines.h"
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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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char *bmpptr = (char *)0x108000+54;
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int a = 0;
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int x = 0;
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int y = 479;
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for (a=0; a < 640*480; a++)
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{
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video_pset(x, y, *(dword *)bmpptr);
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bmpptr += 3;
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x++;
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if (x == 640)
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{
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x = 0;
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y--;
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}
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}
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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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(*(byte *)0xc00b8000)++;
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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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2
link.ld
2
link.ld
@ -2,7 +2,7 @@ OUTPUT_FORMAT("binary")
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ENTRY(start)
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SECTIONS
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{
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.text 0x104000 : {
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.text 0xC0106000 : {
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code = .; _code = .; __code = .;
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*(.text)
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. = ALIGN(4096);
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BIN
rivercity.bmp
BIN
rivercity.bmp
Binary file not shown.
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Before Width: | Height: | Size: 900 KiB |
42
stage2.asm
42
stage2.asm
@ -890,11 +890,43 @@ KERNEL_DATA equ $-gdt
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db 0x00
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db 0x00
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db 0x92
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db 0xcf ;cf
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db 0xcf
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db 0x00
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gdt_end:
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;-------------------------------------------------------
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gdtr32:
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dw gdt_end32-gdt32-1
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dd gdt32
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gdt32:
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dd 0
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dd 0
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;a base of 0x4000_0000, when added to 0xC000_0000 will produce 0x0000_0000 physical before paging in effect
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KERNEL_CODE32 equ $-gdt32
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db 0xff ;limit 7:0
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db 0xff ;limit 15:8
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db 0x00 ;base 7:0
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db 0x00 ;base 15:8
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db 0x00 ;base 23:16
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db 0x9a ;access
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db 0xcf ;flags / limit 19:16
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db 0x40 ;base 31:24
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KERNEL_DATA32 equ $-gdt32
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db 0xff ;segment 16 = 4gb data
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db 0xff
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db 0x00
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db 0x00
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db 0x00
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db 0x92
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db 0xcf
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db 0x40
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gdt_end32:
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;------------------------------------------------------
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go_pm:
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xor ax, ax
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@ -909,12 +941,16 @@ go_pm:
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bits 32
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pmode:
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mov ax, KERNEL_DATA
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lgdt [gdtr32]
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jmp KERNEL_CODE32:pmode_offsetted+0xC0000000
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pmode_offsetted:
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mov ax, KERNEL_DATA32
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mov es, ax
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mov ds, ax
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mov fs, ax
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mov gs, ax
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jmp KERNEL_CODE:BOOT_KERNEL_ADD
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jmp KERNEL_CODE:BOOT_KERNEL_ADD+0xC0000000
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kernel: db "KERNEL BIN", 0
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