Import backup from 2003-08-11
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9035beda29
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10
bootdef.inc
10
bootdef.inc
@ -1,9 +1,17 @@
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%define VERSION "0.1.2" ;HOS version
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%define BOOT_FAT_SEG 0x07E0 ;right after boot sector
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%define BOOT_ROOT_SEG 0x0900 ;right after FAT
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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_SEG 0x0AC0 ;right after ROOT_DIR
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%define BOOT_KERNEL_ADD 0x100000 ;final pmode kernel destination - physical
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%define BOOT_DATA_SEG 0x9000 ;data gathered by stage2 loader goes here
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%define BOOT_HASRD 0x0000 ;1
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%define BOOT_RD_ADD 0x200000 ;2mb for ram disk
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%define BOOT_DRIVE 0x7C24 ;1 - boot drive
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24
kernel.asm
24
kernel.asm
@ -1,7 +1,11 @@
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%include "bootdef.inc"
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bits 32
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org 0x100000
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org BOOT_KERNEL_ADD
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call cls
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mov esi, msg
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mov edi, 0xb8000
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@ -19,6 +23,24 @@ msg_done:
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jmp $
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cls:
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push eax
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push ecx
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push edi
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mov edi, 0xb8000
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mov ecx, 2000
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mov eax, 0x0700
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cls_loop:
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stosw
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loop cls_loop
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pop edi
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pop ecx
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pop eax
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ret
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msg:
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db "This kernel is located at 0x100000! Aren't you glad?", 0
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@ -33,6 +33,8 @@ brFSID DB 'FAT12 ' ; 0036h - File System ID
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;------------------------------------------------------------------------
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start:
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jmp 0:jmphere ;ensure that cs=0 and ip=0x7c...
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jmphere:
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;dl=drive number, save it!
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xor ax, ax
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mov ds, ax
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@ -133,6 +135,8 @@ error:
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jmp $ ;halt! no kernel file found!
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found_file: ;ds:si points to root dir entry
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xor ax, ax
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mov gs, ax
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mov ax, BOOT_STAGE2_SEG
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mov es, ax
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@ -148,7 +152,7 @@ readstage2_loop:
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push ax
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call getCHSfromCluster
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mov ax, 0x0201
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mov dl, 0 ;[brDrive]
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mov dl, [gs:BOOT_DRIVE]
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xor bx, bx
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int 0x13
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mov bx, es
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148
stage2.asm
148
stage2.asm
@ -33,6 +33,8 @@ error:
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jmp $ ;halt! no kernel file found!
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found_file: ;ds:si points to root dir entry of kernel file
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xor ax, ax
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mov gs, ax
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mov ax, [ds:si+26]
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mov bx, BOOT_FAT_SEG
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mov ds, bx ;ds points to beginning of FAT
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@ -44,7 +46,7 @@ readkernel_loop:
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push ax
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call getCHSfromCluster
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mov ax, 0x0201
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mov dl, 0 ;[brDrive]
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mov dl, [gs:BOOT_DRIVE]
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mov bx, BOOT_KERNEL_SEG
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mov es, bx
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xor bx, bx
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@ -81,10 +83,146 @@ odd_cluster:
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got_cluster:
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jmp readkernel_loop
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readkernel_done:
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;------------------------------------------------------
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readkernel_done: ;-------------put more real mode init stuff here!
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;----ask to load RD from floppy
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mov ax, 0xb800
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mov es, ax
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xor ax, ax
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mov ds, ax
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xor di, di
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mov cx, 2000
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mov ax, 0x0700
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cls_loop:
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stosw
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loop cls_loop
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mov dx, 0x3d4 ;move cursor off screen...
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mov al, 0x0e
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out dx, al
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inc dx
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mov al, 0xff
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out dx, al
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dec dx
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mov al, 0x0f
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out dx, al
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inc dx
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out dx, al
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xor di, di
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mov si, txt_welcome
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mov ah, 0x1f
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call puts
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mov di, 160
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mov si, txt_rd1
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mov ah, 7
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call puts
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mov si, txt_rd2
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mov di, 160*2
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call puts
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mov di, 160*3
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mov si, txt_input
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call puts
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get_rd:
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xor ax, ax
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int 0x16
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cmp al, '1'
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jz got_rd
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cmp al, '2'
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jnz get_rd
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got_rd:
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stosb
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sub al, '1'
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push ds
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mov bx, BOOT_DATA_SEG ;segment for data to send kernel
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mov ds, bx
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mov [ds:BOOT_HASRD], al
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pop ds ;ds=0
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cmp al, 0 ;dont load rd
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jz no_rd
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mov cx, 80
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mov edi, 0xb8000+160*4
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filler_loop:
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mov word [ds:edi], 0x0400+176
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inc edi
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inc edi
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loop filler_loop
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mov cx, 80 ;80 cylinders to read
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xor si, si
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mov edi, BOOT_RD_ADD ;ram disk address
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read_cylinder:
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push cx
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mov bx, 0x0100
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mov es, bx
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xor bx, bx
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mov ax, 0x0224
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mov cx, si
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mov ch, cl
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mov cl, 1
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xor dx, dx
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mov dl, [gs:BOOT_DRIVE]
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int 0x13
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mov ebx, 0xb8000
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add bx, si
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shl bl, 1
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mov word [ds:ebx+160*4], 0x0200+219
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push si
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mov esi, 0x1000
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mov cx, 0x2400
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copydisk_loop:
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mov ax, [ds:esi]
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inc esi
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inc esi
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mov [ds:edi], ax
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inc edi
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inc edi
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loop copydisk_loop
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pop si ;what cylinder# we are on...
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inc si
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pop cx
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loop read_cylinder
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no_rd:
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xor ax, ax
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mov ds, ax
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mov ax, 0xb800
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mov es, ax
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mov si, txt_vesa
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mov di, 160*5
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mov ah, 7
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call puts
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xor ax, ax
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int 0x16
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jmp go_pm
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puts:
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lodsb
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or al, al
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jz puts_done
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stosb
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mov al, ah
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stosb
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jmp puts
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puts_done:
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ret
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txt_welcome: db " Welcome to HOS v", VERSION, "! ", 0
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txt_rd1: db "1. Do not load an initial ram disk", 0
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txt_rd2: db "2. Load initial ram disk from floppy", 0
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txt_input: db "Enter your selection: ", 0
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txt_vesa: db "VESA version: ", 0
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;------------------------------------------------------
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getCHSfromCluster:
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;input: ax=lba of sector on floppy (0-2879)
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@ -148,12 +286,10 @@ pmode:
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mov ax, KERNEL_DATA
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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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kernel: db "KERNEL BIN"
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k_count: dw 0
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times 510-($-$$) db 0
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db 0x55, 0xaa
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