Big reorganization stuff '-'
This commit is contained in:
parent
874b2c9e4f
commit
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11
Makefile
11
Makefile
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@ -29,15 +29,16 @@ ASM=nasm
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ASMFLAGS=
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BOOTFLAGS=-f bin
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BOOTDIR=boot
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MBRDIR=boot/mbr
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LOADERDIR=boot/loader
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OBJDIR=build/obj
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BINDIR=build/bin
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boot.mbr.asm: $(BOOTDIR)/mbr.asm $(BOOTDIR)/mbr.inc
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$(ASM) $(BOOTFLAGS) $(BOOTDIR)/mbr.asm -o $(OBJDIR)/boot/mbr.bin
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boot.mbr.asm: $(MBRDIR)/mbr.asm $(MBRDIR)/mbr.inc
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$(ASM) $(BOOTFLAGS) $(MBRDIR)/mbr.asm -o $(OBJDIR)/boot/mbr.bin
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boot.loader.asm: $(BOOTDIR)/loader.asm
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$(ASM) $(BOOTFLAGS) $(BOOTDIR)/loader.asm -o $(OBJDIR)/boot/loader.bin
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boot.loader.asm: $(LOADERDIR)/loader.asm
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$(ASM) $(BOOTFLAGS) $(LOADERDIR)/loader.asm -o $(OBJDIR)/boot/loader.bin
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bootloader: boot.mbr.asm boot.loader.asm
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cp $(OBJDIR)/boot/mbr.bin $(BINDIR)/mbr.bin
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@ -1,10 +0,0 @@
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//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Authors: spectral` //
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// NeoX //
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// //
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// Desc: ELF64 Parser and Loader //
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//----------------------------------------------------------------------------//
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//STUB
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357
boot/loader.asm
357
boot/loader.asm
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@ -1,357 +0,0 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Kernel (second stage) Loader for OS/K ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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;;VIDEO
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%define TRAM 0x0B8000 ; [T]ext[RAM]
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%define VRAM 0x0A0000 ; [V]ideo[RAM]
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;; BPB
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%define OEMName bp+0x03 ; Disk label
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%define bytesPerSector bp+0x0b ; Bytes per sector
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%define sectorsPerCluster bp+0x0d ; Sectors per cluster
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%define reservedSectors bp+0x0e ; Reserved sectors
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%define fats bp+0x10 ; Number of fats
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%define rootDirEntries bp+0x11 ; Number of entries in root dir
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%define sectors bp+0x13 ; Logical sectors
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%define mediaType bp+0x15 ; Media descriptor byte
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%define fatSectors bp+0x16 ; Sectors per FAT
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%define sectorsPerTrack bp+0x18 ; Sectors per track
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%define heads bp+0x1a ; Number of sides/heads
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%define hiddenSectors bp+0x1c ; Hidden sectors
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%define hugeSectors bp+0x20 ; LBA sectors
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%define biosBootdrvNum bp+0x24 ; Bootdrv number
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%define reserved bp+0x25 ; This is not used
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%define bootSignature bp+0x26 ; Bootdrv signature
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%define volumeId bp+0x27 ; Volume ID
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%define volumeLabel bp+0x2b ; Volume Label
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%define fatTypeLabel bp+0x36 ; File system type
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[BITS 16]
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[ORG 0x1000]
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mov ax, cs ; correcting cs after the horrible far jump
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mov ds, ax ; hm... And ds too
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mov es, ax ; And es because it is jealous
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mov [Bootdrv], dl
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xor dl, dl
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jmp 0x0000:main
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;; GDT WITH DOC
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GDT64:
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NULL_SELECTOR: ;; null selector within 64 bits
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dw GDT_LENGTH ; limit of GDT
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dw GDT64 ; linear address of GDT
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dd 0x0 ;
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CODE_SELECTOR: ;; 32-bit code selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10011010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 11001111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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DATA_SELECTOR: ;; flat data selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10010010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- expansion direction. 1 for a LIFO
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 10001111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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LONG_SELECTOR: ;; 64-bit code selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10011010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 10101111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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GDT_LENGTH:
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%include "boot/loader16.inc"
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main:
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;; compatibility check
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push si
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mov si, Init
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call PrintB
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pop si
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call Is64bits
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jc ErrorNo64
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push si
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mov si, Pass
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call PrintB
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pop si
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;; Enabling A20
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push si
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mov si, EnA20
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call PrintB
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pop si
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in al, 0x92
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or al, 2
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out 0x92, al
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push si
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mov si, Pass
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call PrintB
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pop si
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;; DISABLING CURSOR BLINKING AND GETTING INFOS
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call get_dimensions
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call disable_cursor
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;;GO GDT64
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cli ; disable interrupts
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lgdt [GDT64]
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;; ACTIVATE PROTECTED MODE
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mov eax, cr0
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or al, 1b ; PE = 1
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mov cr0, eax
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;; DISABLE PAGING
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mov eax, cr0
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and eax, 0x7FFFFFFF ; PG = 0
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; |0|111111111111111111111111111111
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; |
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; `------ Paging bit
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mov cr0, eax
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push dword [VIDEO_MODE]
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push dword [VGA_HEIGHT]
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jmp (CODE_SELECTOR-GDT64):main32
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ErrorNo64:
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mov si, NoLongMode
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call PrintB
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Die:
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cli
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hlt ; die nooooow
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jmp 0xF000:0xFFF0
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[BITS 32]
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main32:
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pop dword [VGA_HEIGHT32]
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pop dword [VIDEO_MODE32]
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;; VERIFY A20
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pushad
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mov edi,0x112345 ;odd megabyte address.
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mov esi,0x012345 ;even megabyte address.
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mov [esi],esi ;making sure that both addresses contain diffrent values.
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mov [edi],edi ;(if A20 line is cleared the two pointers would point to the address 0x012345 that would contain 0x112345 (edi))
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cmpsd ;compare addresses to see if the're equivalent.
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popad
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jne .A20_on ;if not equivalent , A20 line is set.
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mov WORD [A20_OK], 0
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jmp .A20_end
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.A20_on:
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mov BYTE [A20_OK], 1
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.A20_end:
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;; INITIALIZE PROTECTED MODE SEGMENT REGISTERS
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mov ax, DATA_SELECTOR-GDT64
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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;; ACTIVATE PHYSICAL ADRESS EXTENSION
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mov eax, cr4
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or eax, 100000b ; PAE = 1 = 4 Mo / page. 0 = 4 Ko
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mov cr4, eax
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;;cleanup
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mov edi, 0x70000
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mov ecx, 0x10000
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xor eax, eax
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rep stosd
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;;formatting
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mov dword [0x70000], 0x71000 + 7 ; first PDP table
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mov dword [0x71000], 0x72000 + 7 ; first page directory
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mov dword [0x72000], 0x73000 + 7 ; first page table
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mov edi, 0x73000 ; address of first page table
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mov eax, 7
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mov ecx, 256 ; number of pages to map (1 MB)
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.make_page_entries:
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stosd
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add edi, 4
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add eax, 0x1000
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loop .make_page_entries
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;; pointing pml4
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mov eax, 0x70000 ; Bass address of PML4
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mov cr3, eax ; load page-map level-4 base
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;; ACTIVATE LONG MODE
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mov ecx, 0xC0000080 ; address of MSR
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rdmsr ; read MSR
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or eax, 100000000b ; LME = 1. (Long Mode Enable)
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wrmsr ; write MSR
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;; ACTIVATE PAGING
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mov eax, cr0
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or eax, 0x80000000 ; make bit 31 (PG = Paging) to 1 :
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; |1|000000000000000000000000000000
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; |
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; `------ Paging bit
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mov cr0, eax
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push dword 0
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push dword [VIDEO_MODE]
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push dword 0
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push dword [VGA_HEIGHT]
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jmp (LONG_SELECTOR-GDT64):main64
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[BITS 64]
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%include "boot/loader64.inc"
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;; DATA
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Init db "Booting OS/K !", 0x0D, 0x0A, 0x0D, 0x0A, 0x09, " Checking CPUID...",0
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CPUIDD db 0x09, " Checking CPUID...", 0
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EnA20 db 0x09, " Enabling A20 line...", 0
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ReadAttempt db 0x09, " Attempt to read a sector with ATA commands...", 0x0A, 0x0D, 0x0A, 0x0D,0
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txt db 0x09, " Switching to Long Mode... ", 0
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Reinit db "Booting OS/K !", 0x0D, 0x0A, 0x0D, 0x0A, 0
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Pass db " OK", 0x0A, 0x0D, 0
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Fail db " FAIL!", 0x0A, 0x0D, 0
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msg db "The system is now in x64 mode. Is this not beautiful ?", 0x0A, 0x0D, 0
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NoLongMode db 0x0A, 0x0D, "ERROR : Your computer is not designed for x64 OS", 0
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FileNotFound db "Second Stage Error : The Kernel was not found.", 0x0A, 0x0D, 0
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DiskError db "Second Stage Error : The Disk has crashed.", 0x0A, 0x0D, 0
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filename db "KERNEL BIN"
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Bootdrv db 0
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UserData dw 0
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VGA_HEIGHT dq 0
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VIDEO_MODE dw 0
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VIDEO_MODE32 dw 0
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VGA_HEIGHT32 dw 0
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NextTRAM dq 0x0B8000 ; Last position of cursor
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VIDEO_MODE64 dq 0
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VGA_HEIGHT64 dq 0
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VGA_X dq 0
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A20_OK db 0
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main64:
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pop qword [VGA_HEIGHT64]
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pop qword [VIDEO_MODE64]
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;; INITIALIZE STACK
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mov rsp, 0x9F000
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call clear
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;; Printing
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mov bl, 0x0B
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mov esi, Reinit
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call write
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mov bl, 0x0F
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mov esi, CPUIDD
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call write
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mov bl, 0x0A
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mov esi, Pass
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call write
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mov bl, 0x0F
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mov esi, EnA20
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call write
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cmp BYTE [A20_OK], 1
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je .A20Success
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mov bl, 0x0C
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mov esi, Fail
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call write
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jmp Die
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.A20Success:
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mov bl, 0x0A
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mov esi, Pass
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call write
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mov bl, 0x0F
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mov esi, txt
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call write
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mov bl, 0x0A
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mov esi, Pass
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call write
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mov bl, 0x0D
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mov esi, msg
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call write
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mov bl, 0x0F
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mov esi, ReadAttempt
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call write
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mov rcx, 2
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.looping:
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nop
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nop
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nop
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loop .looping ; Temporized because the ATA drive must be ready
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call ata_read
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jmp Die
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; times 1024 nop
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; XXX ;
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; It seems impossible to have an executable > 2.0 kB...
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@ -1,89 +0,0 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Kernel (second stage) Loader for OS/K INCLUDED FUNCTIONS ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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[BITS 16]
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disable_cursor:
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pushf
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push eax
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push edx
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mov dx, 0x3D4
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mov al, 0xA ; low cursor shape register
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out dx, al
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inc dx
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mov al, 0x20 ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
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out dx, al
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pop edx
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pop eax
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popf
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ret
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get_dimensions:
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push eax
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push ebx
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mov ah, 0x0F
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int 0x10
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mov [VGA_HEIGHT], ah
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mov [VIDEO_MODE], al
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pop ebx
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pop eax
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ret
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Is64bits:
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;-----------------------------------------------------------------------;
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; Checks if the CPU is compatible with 64-bits operating systems ;
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; If the 21th bit of the eax register is set, then CPUID is supported ;
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; We then test CPUID's result to see if long mode is supported ;
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;-----------------------------------------------------------------------;
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pushfd ; recovering the flags in eax
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pop eax
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mov ecx, eax
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xor eax, 0x200000
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push eax
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popfd
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pushfd
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pop eax
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xor eax, ecx
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shr eax, 21
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and eax, 1 ; magical spell of murta
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push ecx
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popfd
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test eax, eax
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jz .NonCompat ; if (CPUID non supporté) goto NonCompat
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000001
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jb .NonCompat ; if (eax <= 0x80000001) goto NonCompat
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mov eax, 0x80000001
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cpuid
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test edx, 1 << 29
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jz .NonCompat ; if (edx != 1 << 29) goto NonCompat
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ret ; back to mbr.s
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.NonCompat:
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stc
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ret
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PrintB:
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;---------------------------------------------------;
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; Print out a simple string. ;
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; ;
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; Expects: DS:SI = String to print ;
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; ;
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; Returns: None ;
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; ;
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;---------------------------------------------------;
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lodsb ; Load byte from ds:si to al
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or al, al ; If al is empty stop looping
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jz .done ; Done looping and return
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mov ah, 0x0e ; Teletype output
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int 0x10 ; Video interupt
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jmp PrintB ; Loop untill string is null
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.done:
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ret
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@ -1,200 +0,0 @@
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|||
;=----------------------------------------------------------------------------=;
|
||||
; GNU GPL OS/K ;
|
||||
; ;
|
||||
; Authors: spectral` ;
|
||||
; NeoX ;
|
||||
; ;
|
||||
; Desc: Kernel (second stage) Loader for OS/K INCLUDED FUNCTIONS ;
|
||||
; (x86_64 architecture only) ;
|
||||
;=----------------------------------------------------------------------------=;
|
||||
|
||||
[BITS 64]
|
||||
|
||||
clear:
|
||||
;-----------------------------------------------------------------------;
|
||||
; x64/LM Clear Text Screen Function ;
|
||||
;-----------------------------------------------------------------------;
|
||||
mov qword [NextTRAM], TRAM
|
||||
mov edi, TRAM
|
||||
push rsi
|
||||
push rdi
|
||||
push rcx
|
||||
mov ah, 0
|
||||
mov al, 0
|
||||
mov rcx, 0x4000 ; traditionnal value
|
||||
rep stosw ; fill screen with al while cx > 0
|
||||
pop rcx
|
||||
pop rsi
|
||||
pop rdi
|
||||
ret
|
||||
|
||||
write:
|
||||
;-----------------------------------------------------------------------;
|
||||
; x64/LM Text Printing Functions ;
|
||||
; bl : color code ;
|
||||
; esi : string address ;
|
||||
;-----------------------------------------------------------------------;
|
||||
mov edi, [NextTRAM] ; TRAM ADDRESS
|
||||
push rsi
|
||||
push rdi
|
||||
.pLoop:
|
||||
lodsb
|
||||
cmp al, 0 ; while @al, i.e. while we're not hitting '\0'
|
||||
je .pEnd
|
||||
cmp al, 0x0A ; LF
|
||||
je .lf
|
||||
cmp al, 0x0D ; CR
|
||||
je .cr
|
||||
stosb ; text subpixel
|
||||
mov al, bl
|
||||
stosb ; color subpixel
|
||||
add qword [NextTRAM], 0x2 ; Cursor moving
|
||||
add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
|
||||
jmp .pLoop
|
||||
.pEnd:
|
||||
pop rdi
|
||||
pop rsi
|
||||
ret
|
||||
.lf:
|
||||
mov rax, [VGA_HEIGHT64]
|
||||
add [NextTRAM], rax ; Cursor moving
|
||||
add [NextTRAM], rax
|
||||
add edi, eax ; Address moving
|
||||
add edi, eax
|
||||
jmp .pLoop
|
||||
.cr:
|
||||
push rax
|
||||
mov rax, qword [VGA_X]
|
||||
sub qword [NextTRAM], rax ; pos = X + Y * VGA_HEIGHT64. Donc pos - X = début de ligne
|
||||
sub edi, edx
|
||||
mov qword [VGA_X], 0
|
||||
pop rax
|
||||
jmp .pLoop
|
||||
.scroll:
|
||||
; XXX I don't think I'll implement this, but never know...;
|
||||
jmp .pLoop
|
||||
|
||||
dump:
|
||||
;-----------------------------------------------------------------------;
|
||||
; x64/LM Dump Printing Functions ;
|
||||
; bl : color code ;
|
||||
; esi : string address ;
|
||||
;-----------------------------------------------------------------------;
|
||||
mov edi, [NextTRAM] ; TRAM ADDRESS
|
||||
push rsi
|
||||
push rdi
|
||||
push rcx
|
||||
mov rcx, 512
|
||||
.pLoop:
|
||||
lodsb
|
||||
stosb ; text subpixel
|
||||
mov al, bl
|
||||
stosb ; color subpixel
|
||||
add qword [NextTRAM], 0x2 ; Cursor moving
|
||||
add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
|
||||
loop .pLoop
|
||||
pop rcx
|
||||
pop rdi
|
||||
pop rsi
|
||||
ret
|
||||
|
||||
ata_read:
|
||||
;-----------------------------------------------------------------------;
|
||||
; x64/LM ATA Reading function ;
|
||||
; ;
|
||||
; ;
|
||||
;-----------------------------------------------------------------------;
|
||||
|
||||
; Technical infos about the ports (Intel Doc):
|
||||
;
|
||||
; Port Access Mode Misc
|
||||
;
|
||||
; 1f0 r/w Data register, the bytes of the disk itself
|
||||
; 1f1 r Error register that can be handled
|
||||
; 1f2 r/w Sector count, how many sectors to read
|
||||
; 1f3 r/w Sector number, the actual sector wanted
|
||||
; 1f4 r/w Cylinder low, cylinders is 0-1024
|
||||
; 1f5 r/w Cylinder high, this makes up the rest of the 1024
|
||||
; 1f6 r/w Drive/head
|
||||
; bit 7 = 1
|
||||
; bit 6 = 0
|
||||
; bit 5 = 1
|
||||
; bit 4 = 0 drive 0 select
|
||||
; = 1 drive 1 select
|
||||
; bit 3-0 head select bits
|
||||
; 1f7 r Status register
|
||||
; bit 7 = 1 controller is executing a command
|
||||
; bit 6 = 1 drive is ready
|
||||
; bit 5 = 1 write fault
|
||||
; bit 4 = 1 seek complete
|
||||
; bit 3 = 1 sector buffer requires servicing
|
||||
; bit 2 = 1 disk data read corrected
|
||||
; bit 1 = 1 index - set to 1 each revolution
|
||||
; bit 0 = 1 previous command ended in an error
|
||||
; 1f7 w Command register
|
||||
; commands:
|
||||
; 50h format track
|
||||
; 20h read sectors with retry
|
||||
; 21h read sectors without retry
|
||||
; 22h read long with retry
|
||||
; 23h read long without retry
|
||||
; 30h write sectors with retry
|
||||
; 31h write sectors without retry
|
||||
; 32h write long with retry
|
||||
; 33h write long without retry
|
||||
;
|
||||
|
||||
push rax
|
||||
push rbx
|
||||
push rdx
|
||||
push rcx
|
||||
push rdi
|
||||
mov dx, 0x1f6 ;Drive and head port
|
||||
mov al, 0x0a0 ;Drive 0, head 0
|
||||
out dx,al
|
||||
|
||||
mov dx, 0x1f2 ;Sector count port
|
||||
mov al, 1 ;Read one sector
|
||||
out dx, al
|
||||
|
||||
mov dx, 0x1f3 ;Sector number port
|
||||
mov al, 1 ;Read sector one
|
||||
out dx, al
|
||||
|
||||
mov dx, 0x1f4 ;Cylinder low port
|
||||
mov al, 0 ;Cylinder 0
|
||||
out dx, al
|
||||
|
||||
mov dx, 0x1f5 ;Cylinder high port
|
||||
mov al, 0 ;The rest of the cylinder 0
|
||||
out dx, al
|
||||
|
||||
mov dx, 0x1f7 ;Command port
|
||||
mov al, 0x20 ;Read with retry.
|
||||
out dx, al
|
||||
still_going:
|
||||
in al, dx
|
||||
test al, 8 ;This means the sector buffer requires
|
||||
;servicing.
|
||||
jz still_going ;Don't continue until the sector buffer
|
||||
;is ready.
|
||||
|
||||
mov cx, 512/2 ;One sector /2
|
||||
mov rdi, buffer
|
||||
mov dx, 0x1f0 ;Data port - data comes in and out of here.
|
||||
rep insw
|
||||
pop rdi
|
||||
pop rcx
|
||||
pop rdx
|
||||
pop rbx
|
||||
pop rax
|
||||
mov bl, 0x0F
|
||||
mov esi, buffer
|
||||
call dump
|
||||
mov bl, 0x0A
|
||||
mov esi, end
|
||||
call write
|
||||
ret
|
||||
|
||||
buffer: times 512 db "_"
|
||||
end: db "[End of Sector]", 0x0
|
||||
175
boot/mbr.asm
175
boot/mbr.asm
|
|
@ -1,175 +0,0 @@
|
|||
;=----------------------------------------------------------------------------=;
|
||||
; GNU GPL OS/K ;
|
||||
; ;
|
||||
; Authors: spectral` ;
|
||||
; NeoX ;
|
||||
; ;
|
||||
; Desc: Bootsector for OS/K ;
|
||||
; (x86_64 architecture only) ;
|
||||
;=----------------------------------------------------------------------------=;
|
||||
|
||||
;; BOOT "SEGMENT"
|
||||
%define BOOT_SEG 0x07c0 ; (BOOT_SEG << 4) + BOOT_OFF = 0x007c00
|
||||
%define BOOT_OFF 0x0000
|
||||
|
||||
;; STACK "SEGMENT"
|
||||
%define STACK_SEG 0x0600 ; (STACK_SEG << 4) + STACK_OFF = 0x007000
|
||||
%define STACK_OFF 0x1000
|
||||
|
||||
;; DISK BUFFER "SEGMENT"
|
||||
%define BUFFER_SEG 0x2000 ; (BUFFER_SEG << 4) + BUFFER_OFF = 0x020000
|
||||
%define BUFFER_OFF 0x0000
|
||||
|
||||
;; SECOND STAGE LOADER "SEGMENT"
|
||||
%define LOAD_SEG 0x0000 ; (LOAD_SEG << 4) + LOAD_OFF = 0x001000
|
||||
%define LOAD_OFF 0x1000
|
||||
|
||||
[BITS 16] ; Ensure 16-bit code (because fuck UEFI)
|
||||
|
||||
Intro:
|
||||
|
||||
jmp short _start ; Jump over the BIOS PARAMETER BLOCK
|
||||
nop ; Required by BIOS to recognize the Disk loul
|
||||
BPB:
|
||||
;---------------------------------------------------;
|
||||
; Disk description table ;
|
||||
;---------------------------------------------------;
|
||||
%define OEMName bp+0x03 ; Disk label
|
||||
%define bytesPerSector bp+0x0b ; Bytes per sector
|
||||
%define sectorsPerCluster bp+0x0d ; Sectors per cluster
|
||||
%define reservedSectors bp+0x0e ; Reserved sectors
|
||||
%define fats bp+0x10 ; Number of fats
|
||||
%define rootDirEntries bp+0x11 ; Number of entries in root dir
|
||||
%define sectors bp+0x13 ; Logical sectors
|
||||
%define mediaType bp+0x15 ; Media descriptor byte
|
||||
%define fatSectors bp+0x16 ; Sectors per FAT
|
||||
%define sectorsPerTrack bp+0x18 ; Sectors per track
|
||||
%define heads bp+0x1a ; Number of sides/heads
|
||||
%define hiddenSectors bp+0x1c ; Hidden sectors
|
||||
%define hugeSectors bp+0x20 ; LBA sectors
|
||||
%define biosBootdrvNum bp+0x24 ; Bootdrv number
|
||||
%define reserved bp+0x25 ; This is not used
|
||||
%define bootSignature bp+0x26 ; Bootdrv signature
|
||||
%define volumeId bp+0x27 ; Volume ID
|
||||
%define volumeLabel bp+0x2b ; Volume Label
|
||||
%define fatTypeLabel bp+0x36 ; File system type
|
||||
|
||||
times 0x3b db 0x00 ; ALLOCATE THE SECTORS FOR THE BPB
|
||||
|
||||
;; ENTRY POINT
|
||||
_start:
|
||||
jmp BOOT_SEG:$+5 ; Fix the cs:ip registers with a vaudou magical trip
|
||||
|
||||
bootstrap:
|
||||
jmp go
|
||||
|
||||
;; LOVELY DATA
|
||||
FileNotFound db "First Stage ERROR : NO LOADER", 0
|
||||
DiskError db "First Stage ERROR : DISK", 0
|
||||
UserData dw 0
|
||||
Bootdrv db 0
|
||||
filename db "LOADER BIN"
|
||||
|
||||
|
||||
;; GO !
|
||||
go:
|
||||
mov ax, BOOT_SEG ; Set segments to the location of the bootloader
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
|
||||
;; INIT STACK
|
||||
cli
|
||||
mov ax, STACK_SEG ; Init the stack
|
||||
mov ss, ax ; Continue init the stack
|
||||
mov sp, STACK_OFF ; Ok man, the stack is in 4K :O
|
||||
sti
|
||||
mov bp, (0x7c0-STACK_SEG) << 4 ; Correct bp (the disk description table)
|
||||
|
||||
;; INITIALIZE BOOT DISK
|
||||
or dl, dl ; Verifying dl points actually to the boot drive
|
||||
jz load_root
|
||||
mov byte [Bootdrv], dl ; Another soul (the disk) saved!
|
||||
mov ah, 0x08
|
||||
int 0x13 ; int 0x13 : read drive parameters/geom
|
||||
jc load_root
|
||||
and cx, 0x003f ; Maximum sector number is the high bits 6-7 of cl
|
||||
mov word [sectorsPerTrack], cx ; And whose low 8 bits are in ch
|
||||
mov dl, dh ; Convert the maximum head number to a word with another vaudou magical trip
|
||||
xor dh, dh
|
||||
inc dx ; because head numbers start at zero
|
||||
mov word [heads], dx ; Another soul (the heads number) saved!
|
||||
|
||||
|
||||
;; LOAD THE ROOT DIRECTORY FROM DISK
|
||||
load_root:
|
||||
xor cx, cx
|
||||
mov ax, 32 ; Size of root dir = (rootDirEntries * 32) / bytesPerSector
|
||||
mul word [rootDirEntries] ; multiply by the total size of the root directory
|
||||
div word [bytesPerSector] ; divide by the number of bytes used per sector
|
||||
xchg cx, ax
|
||||
|
||||
mov al, byte [fats] ; Location of root dir = (fats * fatSectors) + reservedSectors
|
||||
mul word [fatSectors] ; multiply by the sectors used
|
||||
add ax, word [reservedSectors] ; increase ax by the reserved sectors
|
||||
mov word [UserData], ax ; Start of user data = startOfRoot + numberOfRoot
|
||||
add word [UserData], cx ; Add the size and location of the root directory
|
||||
|
||||
mov di, BUFFER_SEG ; Set the extra segment to the disk buffer
|
||||
mov es, di
|
||||
mov di, BUFFER_OFF ; Set es:di and load the root directory into the disk buffer
|
||||
call read_sectors ; Read the sectors
|
||||
|
||||
;; FIND THE SECOND STAGE LOADER
|
||||
mov di, BUFFER_OFF ; Set es:di to the disk buffer
|
||||
mov cx, word [rootDirEntries] ; Search through all of the root dir entries
|
||||
xor ax, ax ; Clear ax for the file entry offset
|
||||
search_root:
|
||||
xchg cx, dx ; Save cx because it's a loop counter
|
||||
mov si, filename ; Load the filename
|
||||
mov cx, 11 ; Compare first 11 bytes
|
||||
rep cmpsb ; Compare si and di cx times
|
||||
je load_fat ; We found the loader
|
||||
add ax, 32 ; File entry offset
|
||||
mov di, BUFFER_OFF ; Point back to the start of the entry
|
||||
add di, ax ; Add the offset to point to the next entry
|
||||
xchg dx, cx
|
||||
loop search_root ; Continue to search for the file
|
||||
|
||||
;; ERROR...
|
||||
mov si, FileNotFound ; Could not find the file
|
||||
call print
|
||||
call reboot
|
||||
|
||||
;; LOAD THE FAT FROM THE FILE
|
||||
load_fat:
|
||||
mov ax, word [es:di + 15] ; Get the file cluster at offset 26
|
||||
push ax ; Store the FAT cluster
|
||||
xor ax, ax ; Size of fat = (fats * fatSectors)
|
||||
mov al, byte [fats] ; Move number of fats into al
|
||||
mul word [fatSectors] ; Move fat sectors into bx
|
||||
mov cx, ax ; Store in cx
|
||||
mov ax, word [reservedSectors] ; Convert the first fat on the disk
|
||||
mov di, BUFFER_OFF ; Set es:di and load the fat sectors into the disk buffer
|
||||
call read_sectors ; Read the sectors
|
||||
|
||||
;; LOAD THE CLUSTERS OF THE LOADER AND JUMP
|
||||
mov di, LOAD_SEG
|
||||
mov es, di ; Set es:bx to where the file will load
|
||||
mov di, LOAD_OFF
|
||||
pop ax ; File cluster restored
|
||||
call read_clusters ; Read clusters from the file
|
||||
mov dl, byte [Bootdrv] ; Pass the boot Bootdrv into dl
|
||||
jmp LOAD_SEG:LOAD_OFF ; Jump to the file loaded!
|
||||
|
||||
hlt ; This should never be hit...
|
||||
; ...
|
||||
; ...
|
||||
; I hope....
|
||||
; ...
|
||||
call reboot
|
||||
|
||||
%include "boot/mbr.inc"
|
||||
|
||||
;; END
|
||||
times 510 - ($ - $$) db 0 ; Pad remainder of boot sector with zeros
|
||||
dw 0xaa55 ; Boot signature
|
||||
161
boot/mbr.inc
161
boot/mbr.inc
|
|
@ -1,161 +0,0 @@
|
|||
;=----------------------------------------------------------------------------=;
|
||||
; GNU GPL OS/K ;
|
||||
; ;
|
||||
; Authors: spectral` ;
|
||||
; NeoX ;
|
||||
; ;
|
||||
; Desc: Bootsector for OS/K INCLUDED FUNCTIONS ;
|
||||
; (x86_64 architecture only) ;
|
||||
;=----------------------------------------------------------------------------=;
|
||||
[BITS 16]
|
||||
|
||||
read_clusters:
|
||||
;---------------------------------------------------;
|
||||
; Read file clusters, starting at the given cluster,;
|
||||
; expects FAT to be loaded into the disk buffer. ;
|
||||
; Please note that this may allocate up to 128KB ;
|
||||
; of ram. ;
|
||||
; ;
|
||||
; Expects: AX = Starting cluster ;
|
||||
; ES:DI = Location to load clusters ;
|
||||
; ;
|
||||
; Returns: None ;
|
||||
; ;
|
||||
;---------------------------------------------------;
|
||||
pusha
|
||||
push es
|
||||
.cluster_loop:
|
||||
xor bh, bh
|
||||
xor dx, dx
|
||||
push ax ; Get the cluster start = (cluster - 2) * sectorsPerCluster + UserData
|
||||
sub ax, 2 ; Subtract 2
|
||||
mov bl, byte [sectorsPerCluster] ; Sectors per cluster is a byte value
|
||||
mul bx ; multiply (cluster - 2) * sectorsPerCluster
|
||||
add ax, word [UserData] ; add the UserData
|
||||
xor ch, ch
|
||||
mov cl, byte [sectorsPerCluster] ; Sectors to read
|
||||
call read_sectors ; Read the sectors
|
||||
pop ax ; Current cluster number
|
||||
xor dx, dx
|
||||
;; Calculate next sector for FAT16 (cluster * 2)
|
||||
mov bx, 2 ; Multiply the cluster by two (cluster is in ax)
|
||||
mul bx
|
||||
;; Load sector in RAM
|
||||
push ds
|
||||
push si
|
||||
mov si, BUFFER_SEG
|
||||
mov ds, si ; Temporarly set ds:si to the FAT buffer
|
||||
mov si, BUFFER_OFF
|
||||
add si, ax ; Point to the next cluster in the FAT entry
|
||||
mov ax, word [ds:si] ; Load ax to the next cluster in FAT
|
||||
pop si
|
||||
pop ds
|
||||
;; Next
|
||||
cmp ax, 0xfff8 ; Check if we are at the end of the file?
|
||||
jae .done
|
||||
add di, 512 ; Add to the pointer offset
|
||||
jnc .cluster_loop
|
||||
;; Correct the buffer because an error will occur if the buffer in memory
|
||||
mov dx, es ; overlaps a 64k page boundry, when di overflows
|
||||
add dh, 0x10 ; it will trigger the carry flag, so correct
|
||||
mov es, dx ; extra segment by 0x1000
|
||||
jmp .cluster_loop ; Load the next file cluster
|
||||
.done:
|
||||
pop es
|
||||
popa
|
||||
ret
|
||||
|
||||
|
||||
read_sectors:
|
||||
;---------------------------------------------------;
|
||||
; Read sectors starting at a given sector by ;
|
||||
; the given times and load into a buffer. Please ;
|
||||
; note that this may allocate up to 128KB of ram. ;
|
||||
; ;
|
||||
; Expects: AX = Starting sector ;
|
||||
; CX = Number of sectors to read ;
|
||||
; ES:DI = Location to load sectors ;
|
||||
; ;
|
||||
; Returns: None ;
|
||||
; ;
|
||||
;---------------------------------------------------;
|
||||
pusha
|
||||
push es
|
||||
mov bx, di ; Convert es:di to es:bx for int 13h
|
||||
.sector_loop:
|
||||
push ax
|
||||
push cx
|
||||
xor dx, dx
|
||||
div word [sectorsPerTrack] ; Divide the lba (value in ax) by sectorsPerTrack
|
||||
mov cx, dx ; Save the absolute sector value
|
||||
inc cx
|
||||
xor dx, dx ; Divide by the number of heads
|
||||
div word [heads] ; to get absolute head and track values
|
||||
mov dh, dl ; Move the absolute head into dh
|
||||
mov ch, al ; Low 8 bits of absolute track
|
||||
shl ah, 1 ; High 2 bits of absolute track
|
||||
shl ah, 1
|
||||
shl ah, 1
|
||||
shl ah, 1
|
||||
shl ah, 1
|
||||
shl ah, 1
|
||||
or cl, ah ; Now cx is set with respective track and sector numbers
|
||||
mov dl, byte [Bootdrv] ; Set correct Bootdrv for int 13h
|
||||
mov di, 21 ; Try five times to read the sector because i love 21
|
||||
.attempt_read:
|
||||
mov ax, 0x0201 ; Read Sectors func of int 13h, read one sector
|
||||
int 0x13 ; Call int 13h (BIOS disk I/O)
|
||||
jnc .read_ok ; If no carry set, the sector has been read
|
||||
xor ah, ah ; Reset Bootdrv func of int 13h
|
||||
int 0x13 ; Call int 13h (BIOS disk I/O)
|
||||
dec di ; Decrease read attempt counter
|
||||
jnz .attempt_read ; Try to read the sector again
|
||||
mov si, DiskError ; Error reading the disk :/
|
||||
call print
|
||||
jmp reboot
|
||||
.read_ok:
|
||||
pop cx
|
||||
pop ax
|
||||
inc ax ; Increase the next sector to read
|
||||
add bx, word [bytesPerSector] ; Add to the buffer address for the next sector
|
||||
jnc .next_sector
|
||||
;; Fixing buffer because an error will occur if the buffer in memory
|
||||
mov dx, es ; overlaps a 64k page boundry, when bx overflows
|
||||
add dh, 0x10 ; it will trigger the carry flag, so correct
|
||||
mov es, dx ; es segment by 0x1000
|
||||
.next_sector:
|
||||
loop .sector_loop
|
||||
pop es
|
||||
popa
|
||||
ret
|
||||
|
||||
print:
|
||||
;---------------------------------------------------;
|
||||
; Print out a simple string. ;
|
||||
; ;
|
||||
; Expects: DS:SI = String to print ;
|
||||
; ;
|
||||
; Returns: None ;
|
||||
; ;
|
||||
;---------------------------------------------------;
|
||||
lodsb ; Load byte from ds:si to al
|
||||
or al, al ; If al is empty stop looping
|
||||
jz .done ; Done looping and return
|
||||
mov ah, 0x0e ; Teletype output
|
||||
int 0x10 ; Video interupt
|
||||
jmp print ; Loop untill string is null
|
||||
.done:
|
||||
ret
|
||||
|
||||
reboot:
|
||||
xor ax, ax
|
||||
int 0x16 ; Get a single keypress
|
||||
mov ah, 0x0e ; Teletype output
|
||||
mov al, 0x0d ; Carriage return
|
||||
int 0x10 ; Video interupt
|
||||
mov al, 0x0a ; Line feed
|
||||
int 0x10 ; Video interupt
|
||||
mov al, 0x0a ; Line feed
|
||||
int 0x10 ; Video interupt
|
||||
xor ax, ax
|
||||
int 0x19 ; Reboot the system
|
||||
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Reference in New Issue