Import backup from 2003-08-10
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10
bootdef.inc
10
bootdef.inc
@ -1,7 +1,9 @@
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%define FAT_SEG 0x07E0 ;right after boot sector
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%define ROOT_SEG 0x0900 ;right after FAT
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%define STAGE2_SEG 0x0AC0 ;right after ROOT_DIR
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%define KERNEL_ADD 0x100000 ;final pmode kernel destination - physical
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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_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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14
kernel.asm
14
kernel.asm
@ -1,14 +1,10 @@
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bits 16
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bits 32
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org 0xac00
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org 0x100000
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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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mov si, msg
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xor di, di
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mov esi, msg
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mov edi, 0xb8000
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msg_loop:
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lodsb
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@ -24,5 +20,5 @@ msg_done:
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jmp $
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msg:
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db "This kernel is located at 0x100000!", 0
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db "This kernel is located at 0x100000! Aren't you glad?", 0
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35
stage1.asm
35
stage1.asm
@ -34,9 +34,10 @@ brFSID DB 'FAT12 ' ; 0036h - File System ID
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start:
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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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mov [brDrive], dl
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cli
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xor ax, ax
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mov ss, ax
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mov sp, 0x7Bfe ;right under boot sector
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sti
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@ -90,7 +91,7 @@ unreal:
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mov cx, 0x0002
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xor dh, dh
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mov dl, [brDrive]
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mov bx, FAT_SEG
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mov bx, BOOT_FAT_SEG
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mov es, bx
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xor bx, bx
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int 0x13
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@ -99,13 +100,13 @@ unreal:
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mov cx, 0x0002 ;cyl/sect
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mov dh, 0x01 ;head
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mov dl, [brDrive] ;drive
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mov bx, ROOT_SEG
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mov bx, BOOT_ROOT_SEG
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mov es, bx
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xor bx, bx
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int 0x13
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;k now read root directory
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mov bx, ROOT_SEG
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mov bx, BOOT_ROOT_SEG
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mov ds, bx
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xor si, si ;k now ds:si points to beginning of root directory
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mov es, si
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@ -118,7 +119,6 @@ loop_compare:
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loop_name:
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cmpsb
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loopz loop_name
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;cmp cx, 0
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jnz goon ;cx didn't get to zero, bad file
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pop si
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pop cx
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@ -133,13 +133,12 @@ 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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mov ax, STAGE2_SEG
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mov ax, BOOT_STAGE2_SEG
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mov es, ax
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mov ax, [ds:si+26]
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mov bx, FAT_SEG
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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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xor bx, bx
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xor di, di
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readstage2_loop:
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@ -147,22 +146,14 @@ readstage2_loop:
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jg readstage2_done
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inc di
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push ax
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push bx
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call getCHSfromCluster
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pop bx
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push bx
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mov ax, 0x0201
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mov dl, [brDrive]
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int 0x13
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pop bx
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add bx, 512
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cmp bx, 0
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jne readstage2_goon
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mov bx, es
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add bx, 0x0100
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mov es, bx
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mov dl, 0 ;[brDrive]
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xor bx, bx
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readstage2_goon:
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int 0x13
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mov bx, es
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add bx, 0x0020
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mov es, bx
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pop ax ;current logical cluster #
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mov cx, ax ;cx=logical cluster
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@ -184,7 +175,7 @@ got_cluster:
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readstage2_done:
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jmp 0:(STAGE2_SEG*16)
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jmp 0:BOOT_STAGE2_ADD
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;------------------------------------------------------
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getCHSfromCluster:
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169
stage2.asm
169
stage2.asm
@ -1,114 +1,13 @@
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%define FAT_SEG 0x07E0 ;right after boot sector
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%define ROOT_SEG 0x0900 ;right after FAT
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%define KERNEL_SEG 0x0AC0 ;right after ROOT_DIR
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%define KERNEL_ADD 0x100000 ;1mb - kernel final address
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%include "bootdef.inc"
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[bits 16]
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org 0x7c00
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org BOOT_STAGE2_ADD
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jmp short start
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; --------------------------------------------------
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; data portion of the "DOS BOOT RECORD"
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; ----------------------------------------------------------------------
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brINT13Flag DB 90H ; 0002h - 0EH for INT13 AH=42 READ
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brOEM DB 'MSDOS5.0' ; 0003h - OEM ID - Windows 95B
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brBPS DW 512 ; 000Bh - Bytes per sector
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brSPC DB 1 ; 000Dh - Sector per cluster
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brSc_b4_fat DW 1 ; 000Eh - Reserved sectors
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brFATs DB 2 ; 0010h - FAT copies
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brRootEntries DW 0E0H ; 0011h - Root directory entries
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brSectorCount DW 2880 ; 0013h - Sectors in volume, < 32MB
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brMedia DB 240 ; 0015h - Media descriptor
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brSPF DW 9 ; 0016h - Sectors per FAT
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brSc_p_trk DW 18 ; 0018h - Sectors per head/track
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brHPC DW 2 ; 001Ah - Heads per cylinder
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brSc_b4_prt DD 0 ; 001Ch - Hidden sectors
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brSectors DD 0 ; 0020h - Total number of sectors
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brDrive DB 0 ; 0024h - Physical drive no.
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DB 0 ; 0025h - Reserved (FAT32)
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DB 29H ; 0026h - Extended boot record sig (FAT32)
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brSerialNum DD 404418EAH ; 0027h - Volume serial number
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brLabel DB 'HOS 0.1.1 ' ; 002Bh - Volume label
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brFSID DB 'FAT12 ' ; 0036h - File System ID
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;------------------------------------------------------------------------
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start:
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;dl=drive number, save it!
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mov [brDrive], dl
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cli
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xor ax, ax
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mov ss, ax
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mov sp, 0x7Bfe ;right under boot sector
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sti
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mov ax, 0xb800
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mov ds, ax
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mov es, ax
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xor di, di
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mov ax, 0x0700
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mov cx, 2000
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cls:
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stosw
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loop cls
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enable_a20:
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in al, 0x64
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test al, 2
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jnz enable_a20
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mov al, 0xD1
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out 0x64, al
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ea20_2: in al, 0x64
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and ax, byte 2
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jnz ea20_2
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mov al, 0xDF
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out 0x60, al
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unreal:
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xor ax, ax
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mov es, ax
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mov ds, ax
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lgdt [gdtr] ;load gdt
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cli
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push es
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push ds ;save segment values
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mov ebx, cr0
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inc bl
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mov cr0, ebx ;pmode!
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mov ax, KERNEL_DATA
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mov es, ax
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mov ds, ax ;load segment limits
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dec bl
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mov cr0, ebx ;back to real mode!
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pop ds
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pop es ;segments back, with 4gb limits!
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sti
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;now lets read in the FAT and root directory so we can search for the kernel file...
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mov ax, 0x0209 ;FAT1
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mov cx, 0x0002
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xor dh, dh
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mov dl, [brDrive]
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mov bx, FAT_SEG
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mov es, bx
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xor bx, bx
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int 0x13
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mov ax, 0x020E ;root directory
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mov cx, 0x0002 ;cyl/sect
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mov dh, 0x01 ;head
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mov dl, [brDrive] ;drive
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mov bx, ROOT_SEG
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mov es, bx
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xor bx, bx
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int 0x13
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;k now read root directory
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mov bx, ROOT_SEG
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mov bx, BOOT_ROOT_SEG
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mov ds, bx
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xor si, si ;k now ds:si points to beginning of root directory
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mov es, si
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@ -120,7 +19,7 @@ loop_compare:
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mov cx, 11
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loop_name:
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cmpsb
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loopnz loop_name
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loopz loop_name
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jnz goon ;cx didn't get to zero, bad file
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pop si
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pop cx
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@ -134,36 +33,35 @@ 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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mov ax, KERNEL_SEG
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mov es, ax
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mov ax, [ds:si+26]
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mov bx, FAT_SEG
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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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xor bx, bx
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xor di, di
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mov edi, BOOT_KERNEL_ADD
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readkernel_loop:
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cmp ax, 0xff7
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jg readkernel_done
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inc di
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push ax
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push bx
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call getCHSfromCluster
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pop bx
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push bx
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mov ax, 0x0201
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mov dl, [brDrive]
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int 0x13
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pop bx
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add bx, 512
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cmp bx, 0
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jne readkernel_goon
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mov bx, es
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add bx, 0x0100
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mov dl, 0 ;[brDrive]
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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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readkernel_goon:
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int 0x13
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mov cx, 256
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xor ax, ax
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mov es, ax
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mov esi, BOOT_KERNEL_SEG*16
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copykernel_loop:
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mov ax, [es:esi]
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mov [es:edi], ax
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inc esi
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inc esi
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inc edi
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inc edi
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loop copykernel_loop
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pop ax ;current logical cluster #
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mov cx, ax ;cx=logical cluster
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@ -183,25 +81,7 @@ odd_cluster:
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got_cluster:
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jmp readkernel_loop
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readkernel_done: ;now copy kernel to final location in KERNEL_ADD!
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xor ecx, ecx
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mov cx, di ;cx=# of 512byte sectors loaded
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shl ecx, 9 ;ecx=ecx*512
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mov ax, KERNEL_SEG
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mov ds, ax
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xor esi, esi
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xor ax, ax
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mov es, ax
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mov edi, KERNEL_ADD
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movekernel_loop:
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mov al, [ds:esi]
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inc esi
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mov [es:edi], al
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inc edi
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dec ecx
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cmp ecx, 0
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jne movekernel_loop
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readkernel_done:
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jmp go_pm
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@ -229,6 +109,7 @@ gdtr:
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gdt:
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dd 0
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dd 0
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KERNEL_CODE equ $-gdt
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db 0xff ;limit 7:0
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db 0xff ;limit 15:8
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@ -267,7 +148,7 @@ 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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jmp KERNEL_CODE:KERNEL_ADD
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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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