real initial commit
This commit is contained in:
Lucia Ceionia
parent
cf7710ad25
commit
0fa405dd98
4
.gitignore
vendored
Normal file
4
.gitignore
vendored
Normal file
@ -0,0 +1,4 @@
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*.o
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*.bin
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*.lock
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bx_enh_dbg.ini
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11
Makefile
Normal file
11
Makefile
Normal file
@ -0,0 +1,11 @@
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all:
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nasm boot.nasm -o boot.bin
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nasm -f elf32 -o entry.o entry.nasm
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clang -target "i686-elf" -ffreestanding -m32 -march=pentium-m -fno-stack-protector -nostdlib -c -o kernel.o kernel.c
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#clang -target "i686-elf" -O2 -ffreestanding -m32 -march=i386 -fno-stack-protector -nostdlib -c -o kernel.o kernel.c
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gcc -Tlink.ld -m32 -ffreestanding -nostartfiles -nostdlib -o kernel.bin entry.o kernel.o
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dd bs=256 count=1 conv=notrunc if=boot.bin of=virtdisk.bin
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dd bs=512 seek=1 conv=notrunc if=kernel.bin of=virtdisk.bin
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virtdisk:
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dd bs=1M count=32 if=/dev/zero of=virtdisk.bin
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echo -n -e '\x55\xaa' | dd bs=1 seek=510 conv=notrunc of=virtdisk.bin
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54
bochsrc
Normal file
54
bochsrc
Normal file
@ -0,0 +1,54 @@
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# configuration file generated by Bochs
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display_library: x, options="gui_debug"
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#magic_break: enabled=1
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plugin_ctrl: unmapped=true, biosdev=true, speaker=true, extfpuirq=true, parallel=true, serial=true, iodebug=true, pcidev=false, usb_uhci=false
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config_interface: textconfig
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display_library: x
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memory: host=32, guest=32
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romimage: file="/usr/share/bochs/BIOS-bochs-latest", address=0x00000000, options=none
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vgaromimage: file="/usr/share/bochs/VGABIOS-lgpl-latest"
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boot: disk
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floppy_bootsig_check: disabled=0
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floppya: type=none
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# no floppyb
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ata0: enabled=true, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
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ata0-master: type=disk, path="virtdisk.bin", mode=flat, cylinders=2, heads=16, spt=63, sect_size=512, model="Generic 1234", biosdetect=auto, translation=auto
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ata0-slave: type=none
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ata1: enabled=true, ioaddr1=0x170, ioaddr2=0x370, irq=15
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ata1-master: type=none
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ata1-slave: type=none
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ata2: enabled=false
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ata3: enabled=false
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optromimage1: file=none
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optromimage2: file=none
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optromimage3: file=none
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optromimage4: file=none
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optramimage1: file=none
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optramimage2: file=none
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optramimage3: file=none
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optramimage4: file=none
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pci: enabled=1, chipset=i440fx, slot1=none, slot2=none, slot3=none, slot4=none, slot5=none
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vga: extension=vbe, update_freq=5, realtime=1, ddc=builtin
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cpu: count=1:1:1, ips=4000000, quantum=16, model=core_duo_t2400_yonah, reset_on_triple_fault=1, cpuid_limit_winnt=0, ignore_bad_msrs=1, mwait_is_nop=0
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print_timestamps: enabled=0
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debugger_log: -
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magic_break: enabled=0
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port_e9_hack: enabled=0
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private_colormap: enabled=0
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clock: sync=none, time0=local, rtc_sync=0
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# no cmosimage
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log: -
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logprefix: %t%e%d
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debug: action=ignore
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info: action=report
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error: action=report
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panic: action=ask
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keyboard: type=mf, serial_delay=250, paste_delay=100000, user_shortcut=none
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mouse: type=ps2, enabled=false, toggle=ctrl+mbutton
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speaker: enabled=true, mode=system
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parport1: enabled=true, file=none
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parport2: enabled=false
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com1: enabled=true, mode=null
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com2: enabled=false
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com3: enabled=false
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com4: enabled=false
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31
boot.nasm
Normal file
31
boot.nasm
Normal file
@ -0,0 +1,31 @@
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[ORG 0x7c00]
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[BITS 16]
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xor ax, ax
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mov ds, ax
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mov es, ax
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mov ah, 0x42
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mov si, addr_packet
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int 0x13
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jnc 0x8000
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push 0xb800
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pop es
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xor di, di
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mov si, string
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mov cx, 10
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mov ah, 0x7
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err_print:
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lodsb
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stosw
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loop err_print
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hlt_loop:
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hlt
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jmp hlt_loop
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string: db 'DISK ERROR'
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addr_packet:
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db 0x10, 0x00 ; size, reserved
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dw 0x20 ; blocks
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dd 0x8000 ; transfer buffer
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dq 1 ; start block
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337
entry.nasm
Normal file
337
entry.nasm
Normal file
@ -0,0 +1,337 @@
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[BITS 16]
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global entry
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entry:
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cli ; no interrupts
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xor ax,ax
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mov ds, ax
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lgdt [gdt_desc] ; load gdt register
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mov eax, cr0 ; set pmode bit
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or al, 1
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mov cr0, eax
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jmp 08h:Pmodecode
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[BITS 32]
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Pmodecode:
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mov ax, 0x10 ; set up segments
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov ebp, 0x400000
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mov esp, ebp
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mov eax, 0x1f001f00
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mov ecx, (80*25)/2
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mov edi, 0xb8000
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rep stosd
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call start
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hlt_loop:
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hlt
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jmp hlt_loop
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setup_paging:
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mov ecx, 1024*3 ; 3K?
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xor eax, eax
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mov edi, 0x1000
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rep stosd ; zero first 3K for some reason
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mov edi, 0x4000
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mov eax, 0x800007 ; 8MB + 7
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std ; fill backwards
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.fill:
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stosd
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sub eax, 0x1000
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jge .fill
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cld ; fix direction
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mov dword [0x0000], 0x2000 + 7
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mov dword [0x0004], 0x3000 + 7
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mov eax, 0x1000
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mov cr3, eax ; page dir start 0x1000
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mov eax, cr0
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or eax, 0x80000000
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mov cr0, eax ; set paging bit
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ret ; flushes pre-fetch queue
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[BITS 16]
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real_hexprint:
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xor cx, cx
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mov bl, al
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shr al, 4
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jmp .donibble
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.nibble2:
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mov al, bl
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inc cx
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.donibble:
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and al, 0x0F
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cmp al, 0x0A
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jl .noadjust
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add al, 'A' - '0' - 10
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.noadjust:
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add al, '0'
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mov ah, 0x1f
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stosw
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test cx, cx
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jz .nibble2
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ret
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real_printword:
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mov dx, ax
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mov al, ah
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call real_hexprint
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mov ax, dx
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call real_hexprint
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ret
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extern v86Code
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v86Code:
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mov ax, 0xb814
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mov es, ax
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mov di, 20
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mov ax, sp
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call real_printword
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add di, 2
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mov ax, ds
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call real_printword
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add di, 2
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mov ax, cs
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call real_printword
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.loop:
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inc byte [0]
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;mov ax, 0x1111
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;mov ds, ax
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;mov ax, 0x2222
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;mov es, ax
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;mov ax, 0x3333
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;mov fs, ax
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;mov ax, 0x4444
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;mov gs, ax
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;mov ax, 0x5555
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;mov ss, ax
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;mov ax, 0x6666
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;mov sp, ax
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int 3
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;jmp .loop
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mov ax, 0x13
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int 0x10
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int 0x30 ; exit
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jmp $
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extern real_test
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real_test:
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nop
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nop
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nop
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jmp $
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[BITS 32]
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; extern void enter_v86(uint32_t ss, uint32_t esp, uint32_t cs, uint32_t eip);
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global enter_v86
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enter_v86:
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mov ebp, esp ; save stack pointer
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push dword [ebp+4] ; ss
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push dword [ebp+8] ; esp
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pushfd ; eflags
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or dword [esp], (1 << 17) ; set VM flags
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;or dword [esp], (3 << 12) ; IOPL 3
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push dword [ebp+12] ; cs
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push dword [ebp+16] ; eip
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iret
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user_test:
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mov dword [0xb8000], 0x0f000f00 | 'U' | 's' << 16
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mov dword [0xb8004], 0x0f000f00 | 'e' | 'r' << 16
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mov dword [0xb8008], 0x0f000f00 | 'm' | 'o' << 16
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mov dword [0xb800C], 0x0f000f00 | 'd' | 'e' << 16
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mov word [0xb8010], 0x0f00 | '!'
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mov edi, 0xA0000
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xor eax, eax
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.loop:
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mov cx, 320
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rep stosb
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inc al
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cmp eax, 200
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jl .loop
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xor ebx, ebx
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div bl
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global jmp_usermode_test
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jmp_usermode_test:
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mov ax, 0x20 | 3
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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 eax, esp
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push 0x20 | 3
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push eax
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pushfd
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push 0x18 | 3
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push user_test
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iret
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extern unhandled_handler
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unhandled_handler:
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mov ax, 0x10
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mov ds, ax
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mov dword [0xb8000], 0x0f000f00 | 'E' | 'R' << 16
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mov dword [0xb8004], 0x0f000f00 | 'R' | 'O' << 16
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mov dword [0xb8008], 0x0f000f00 | 'R' | '!' << 16
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.hlt:
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hlt
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jmp .hlt
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extern gpf_handler_v86
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global gpfHandler
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gpfHandler:
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iret
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mov ax, 0x10
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mov ds, ax
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;jmp gpf_handler_v86
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mov word [0xb8000], 0x0f00 | 'G'
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mov word [0xb8002], 0x0f00 | 'P'
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mov word [0xb8004], 0x0f00 | 'F'
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.hlt:
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hlt
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jmp .hlt
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scancodesToAscii: db 0, 0 ; 0x00 - 0x01
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db "1234567890" ; 0x02 - 0x0B
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db "-=" ; 0x0C - 0x0D
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db 0, 0 ; 0x0E - 0x0F
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db "qwertyuiop[]" ; 0x10 - 0x1B
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db 0, 0 ; 0x1C - 0x1D
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db "asdfghjkl;'`" ; 0x1E - 0x29
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db 0 ; 0x2A
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db "\zxcvbnm,./" ; 0x2B - 0x35
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db 0 ; 0x36
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db '*' ; 0x37
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db 0 ; 0x38
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db ' ' ; 0x39
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db 'C'
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scancodesToAsciiEnd:
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cursorCurrent: dd 0xb8000 + (80*6*2)
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global keyboardHandler
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keyboardHandler:
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push eax
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push ebx
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push ds
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mov ax, 0x10
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mov ds, ax
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xor eax, eax
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in al, 0x60
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cmp eax, 0x3A
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jg .done
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mov al, [scancodesToAscii+eax]
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test al, al
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jz .done
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mov ebx, [cursorCurrent]
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mov byte [ebx], al
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add dword [cursorCurrent], 2
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mov byte [KBDWAIT], 1
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.done:
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mov al, 0x20
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out 0x20, al
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pop ds
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pop ebx
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pop eax
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iret
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KBDWAIT: db 0
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global kbd_wait
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kbd_wait:
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mov byte [KBDWAIT], 0
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.loop:
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hlt
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xor eax, eax
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mov al, [KBDWAIT]
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test eax, eax
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jz .loop
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ret
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global timerHandler
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timerHandler:
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push eax
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push ds
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mov ax, 0x10
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mov ds, ax
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inc byte [(0xb8000 + (80*8*2))]
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mov al, 0x20
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out 0x20, al
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pop ds
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pop eax
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iret
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global picInit
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picInit:
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mov al, 0x11 ; initialization sequence
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out 0x20, al ; send to 8259A-1
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jmp $+2
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jmp $+2
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out 0xA0, al ; and to 8259A-2
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jmp $+2
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jmp $+2
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mov al, 0x20 ; start of hardware ints (0x20)
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out 0x21, al
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jmp $+2
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jmp $+2
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mov al, 0x28 ; start of hardware ints 2 (0x28)
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0x04 ; 8259-1 is master
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out 0x21, al
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jmp $+2
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jmp $+2
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mov al, 0x02 ; 8259-2 is slave
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0x01 ; 8086 mode for both
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out 0x21, al
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jmp $+2
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jmp $+2
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0xFF ; all interrupts off for now
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out 0x21, al
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jmp $+2
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jmp $+2
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out 0xA1, al
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ret
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global flushTSS
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flushTSS:
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mov ax, 0x28
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ltr ax
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ret
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extern tss_data
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extern start
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gdt_desc:
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dw gdt_end - gdt
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dd gdt
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gdt:
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gdt_null: dq 0
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gdt_code: dw 0xFFFF, 0 ; bits 0-15 limit (4GB), bits 0-15 base address
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db 0 ; bits 16-23 base address
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db 10011010b ; access byte
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db 11001111b ; bits 16-19 limit (4GB), 4 bits flags
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db 0 ; bits 24-31 base address
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gdt_data: dw 0xFFFF, 0 ; bits 0-15 limit (4GB), bits 0-15 base address
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db 0 ; bits 16-23 base address
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db 10010010b ; access byte
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db 11001111b ; bits 16-19 limit (4GB), 4 bits flags
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db 0 ; bits 24-31 base address
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gdt_r3code: dw 0xFFFF, 0 ; bits 0-15 limit (4GB), bits 0-15 base address
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db 0 ; bits 16-23 base address
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db 0xFA ; access byte
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db 11001111b ; bits 16-19 limit (4GB), 4 bits flags
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db 0 ; bits 24-31 base address
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gdt_r3data: dw 0xFFFF, 0 ; bits 0-15 limit (4GB), bits 0-15 base address
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db 0 ; bits 16-23 base address
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db 0xF2 ; access byte
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db 11001111b ; bits 16-19 limit (4GB), 4 bits flags
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db 0 ; bits 24-31 base address
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gdt_tss: dw 0x2080, 0x0000;26*4, tss_data ; bits 0-15 limit (4GB), bits 0-15 base address
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db 0x2 ; bits 16-23 base address
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db 0x89 ; access byte
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db 00000000b ; bits 16-19 limit (4GB), 4 bits flags
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db 0 ; bits 24-31 base address
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gdt_end:
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453
kernel.c
Normal file
453
kernel.c
Normal file
@ -0,0 +1,453 @@
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#include <stdint.h>
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typedef unsigned short word;
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char nibbleToHex(char n) {
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return n > 9 ? (n - 10) + 'A' : n + '0';
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}
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void printByte(char v, short *buff) {
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*(char *)&buff[0] = nibbleToHex((v >> 4) & 0xF);
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*(char *)&buff[1] = nibbleToHex(v & 0xF);
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}
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void printWord(short v, short *buff) {
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printByte(v >> 8, buff);
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printByte(v, &buff[2]);
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}
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void printDword(int v, short *buff) {
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printWord(v >> 16, buff);
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printWord(v, &buff[4]);
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}
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char check_apic() {
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uint32_t eax, ebx, ecx, edx;
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asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
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return (edx & (1 << 9)) != 0;
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}
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char check_sse() {
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uint32_t eax, ebx, ecx, edx;
|
||||
asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
|
||||
return (edx & (1 << 25)) != 0;
|
||||
}
|
||||
|
||||
struct __attribute__((__packed__)) IDTR_t {
|
||||
uint16_t size;
|
||||
uint32_t offset;
|
||||
};
|
||||
|
||||
struct __attribute__((__packed__)) InterruptDescriptor32 {
|
||||
uint16_t offset_1; // offset bits 0..15
|
||||
uint16_t selector; // a code segment selector in GDT or LDT
|
||||
uint8_t zero; // unused, set to 0
|
||||
uint8_t type_attributes; // gate type, dpl, and p fields
|
||||
uint16_t offset_2; // offset bits 16..31
|
||||
};
|
||||
|
||||
__attribute__((aligned(0x10)))
|
||||
struct InterruptDescriptor32 IDT[256];
|
||||
struct IDTR_t IDTR;
|
||||
|
||||
void outb(uint16_t port, uint8_t value) {
|
||||
asm volatile("outb %%al, %%dx" : : "d"(port), "a"(value));
|
||||
}
|
||||
uint8_t inb(uint16_t port) {
|
||||
uint8_t value;
|
||||
asm volatile("inb %%dx, %%al" : "=a"(value) : "d"(port));
|
||||
return value;
|
||||
}
|
||||
|
||||
void IRQ_set_mask(char IRQline) {
|
||||
uint16_t port;
|
||||
uint8_t value;
|
||||
if (IRQline < 8) {
|
||||
port = 0x21;
|
||||
} else {
|
||||
port = 0xA1;
|
||||
IRQline -= 8;
|
||||
}
|
||||
value = inb(port) | (1 << IRQline);
|
||||
outb(port, value);
|
||||
}
|
||||
void IRQ_clear_mask(char IRQline) {
|
||||
uint16_t port;
|
||||
uint8_t value;
|
||||
if (IRQline < 8) {
|
||||
port = 0x21;
|
||||
} else {
|
||||
port = 0xA1;
|
||||
IRQline -= 8;
|
||||
}
|
||||
value = inb(port) & ~(1 << IRQline);
|
||||
outb(port, value);
|
||||
}
|
||||
|
||||
struct interrupt_frame {
|
||||
uint32_t eip, cs;
|
||||
uint32_t eflags;
|
||||
uint32_t esp, ss;
|
||||
uint32_t es, ds, fs, gs;
|
||||
};
|
||||
|
||||
/* Real Mode helper macros */
|
||||
/* segment:offset pair */
|
||||
typedef uint32_t FARPTR;
|
||||
|
||||
/* Make a FARPTR from a segment and an offset */
|
||||
#define MK_FP(seg, off) ((FARPTR) (((uint32_t) (seg) << 16) | (uint16_t) (off)))
|
||||
|
||||
/* Extract the segment part of a FARPTR */
|
||||
#define FP_SEG(fp) (((FARPTR) fp) >> 16)
|
||||
|
||||
/* Extract the offset part of a FARPTR */
|
||||
#define FP_OFF(fp) (((FARPTR) fp) & 0xffff)
|
||||
|
||||
/* Convert a segment:offset pair to a linear address */
|
||||
#define FP_TO_LINEAR(seg, off) ((void*)(uintptr_t)((((uint32_t)seg) << 4) + ((uint32_t)off)))
|
||||
|
||||
FARPTR i386LinearToFp(void *ptr)
|
||||
{
|
||||
unsigned seg, off;
|
||||
off = (uintptr_t) ptr & 0xffff;
|
||||
seg = ((uintptr_t) ptr >> 16);
|
||||
return MK_FP(seg, off);
|
||||
}
|
||||
|
||||
#define EFLAG_IF ((uint32_t)1 << 9)
|
||||
#define EFLAG_VM ((uint32_t)1 << 17)
|
||||
|
||||
char v86_if = 0;
|
||||
extern void real_test();
|
||||
extern void kbd_wait();
|
||||
#define VALID_FLAGS 0xDFF
|
||||
__attribute__ ((interrupt))
|
||||
void gpf_handler_v86(struct interrupt_frame *frame, uint32_t error_code) {
|
||||
asm volatile("mov %%ax,%%ds"::"a"(0x10));
|
||||
uint8_t *ip;
|
||||
uint16_t *stack, *ivt;
|
||||
uint32_t *stack32;
|
||||
char is_operand32 = 0, is_address32 = 0;
|
||||
ip = ((frame->cs << 4) + frame->eip) & 0xFFFFF;
|
||||
ivt = (uint16_t*)0x0000;
|
||||
stack = FP_TO_LINEAR(frame->ss, frame->esp);
|
||||
stack32 = (uint32_t*)stack;
|
||||
|
||||
char *vga = (char*)0xb8000 + (160 * 10);
|
||||
vga[0] = 'I'; vga[2] = 'P'; printWord(frame->eip, &vga[4]); vga += 14;
|
||||
vga[0] = 'C'; vga[2] = 'S'; printWord(frame->cs, &vga[4]); vga += 14;
|
||||
vga[0] = 'F'; vga[2] = 'L'; printDword(frame->eflags, &vga[4]); vga += 14;
|
||||
vga = (char*)0xb8000 + (160 * 11);
|
||||
vga[0] = 'S'; vga[2] = 'P'; printWord(frame->esp, &vga[4]); vga += 14;
|
||||
vga[0] = 'S'; vga[2] = 'S'; printWord(frame->ss, &vga[4]); vga += 14;
|
||||
vga = (char*)0xb8000 + (160 * 12);
|
||||
vga[0] = 'E'; vga[2] = 'S'; printWord(frame->es, &vga[4]); vga += 14;
|
||||
vga[0] = 'D'; vga[2] = 'S'; printWord(frame->ds, &vga[4]); vga += 14;
|
||||
vga[0] = 'F'; vga[2] = 'S'; printWord(frame->fs, &vga[4]); vga += 14;
|
||||
vga[0] = 'G'; vga[2] = 'S'; printWord(frame->gs, &vga[4]); vga += 14;
|
||||
|
||||
//vga[2]++;
|
||||
//printDword(frame, &vga[20]);
|
||||
//vga = &vga[38];
|
||||
//uint32_t *fr = frame;
|
||||
//for (int i = 0; i < sizeof(struct interrupt_frame)/sizeof(uint32_t); i++) {
|
||||
// printDword(fr[i], vga);
|
||||
// vga += (sizeof(uint32_t)*2+1)*2;
|
||||
//}
|
||||
//vga = (char*)0xb80A0;
|
||||
//printDword(ip, &vga[20]);
|
||||
//vga = &vga[38];
|
||||
//for (int i = 0; i < 16; i++) {
|
||||
// printByte(ip[i], vga);
|
||||
// vga += (sizeof(uint8_t)*2)*2;
|
||||
//}
|
||||
vga = (char*)0xb8000 + (160*3);
|
||||
for(;;) {
|
||||
switch (ip[0]) {
|
||||
case 0x66: // O32
|
||||
is_operand32 = 1;
|
||||
ip++;
|
||||
frame->eip = (uint16_t)(frame->eip + 1);
|
||||
break;
|
||||
case 0x67: // A32
|
||||
is_address32 = 1;
|
||||
ip++;
|
||||
frame->eip = (uint16_t)(frame->eip + 1);
|
||||
break;
|
||||
case 0x9C: // PUSHF
|
||||
if (is_operand32) {
|
||||
frame->esp = ((frame->esp & 0xffff) - 4) & 0xffff;
|
||||
stack32--;
|
||||
stack32[0] = frame->eflags & VALID_FLAGS;
|
||||
if (v86_if)
|
||||
stack32[0] |= EFLAG_IF;
|
||||
else
|
||||
stack32[0] &= ~EFLAG_IF;
|
||||
} else {
|
||||
frame->esp = ((frame->esp & 0xffff) - 2) & 0xffff;
|
||||
stack--;
|
||||
stack[0] = (uint16_t)frame->eflags;
|
||||
if (v86_if)
|
||||
stack[0] |= EFLAG_IF;
|
||||
else
|
||||
stack[0] &= ~EFLAG_IF;
|
||||
}
|
||||
frame->eip = (uint16_t)(frame->eip + 1);
|
||||
goto done;
|
||||
case 0x9D: // POPF
|
||||
if (is_operand32) {
|
||||
frame->eflags = EFLAG_IF | EFLAG_VM | (stack32[0] & VALID_FLAGS);
|
||||
v86_if = (stack32[0] & EFLAG_IF) != 0;
|
||||
frame->esp = ((frame->esp & 0xffff) + 4) & 0xffff;
|
||||
} else {
|
||||
frame->eflags = EFLAG_IF | EFLAG_VM | stack[0];
|
||||
v86_if = (stack[0] & EFLAG_IF) != 0;
|
||||
frame->esp = ((frame->esp & 0xffff) + 2) & 0xffff;
|
||||
}
|
||||
frame->eip = (uint16_t)(frame->eip + 1);
|
||||
goto done;
|
||||
case 0xCD: // INT n
|
||||
vga[0] = 'I'; vga[2]++; if (vga[2] < '0') vga[2] = '0';
|
||||
asm volatile("nop\nnop");
|
||||
switch (ip[1]) {
|
||||
case 0x30: // Exit V86 Mode?
|
||||
asm volatile("nop\nnop");
|
||||
asm volatile("jmp jmp_usermode_test");
|
||||
//__builtin_unreachable();
|
||||
break;
|
||||
//case 0x20: // ???
|
||||
//case 0x21: // ???
|
||||
case 0x3: // Debugger trap
|
||||
kbd_wait();
|
||||
asm volatile("nop");
|
||||
default:
|
||||
stack -= 3;
|
||||
frame->esp = ((frame->esp & 0xffff) - 6) & 0xffff;
|
||||
|
||||
stack[0] = (uint16_t) (frame->eip + 2);
|
||||
stack[1] = frame->cs;
|
||||
stack[2] = (uint16_t) frame->eflags;
|
||||
|
||||
if (v86_if)
|
||||
stack[2] |= EFLAG_IF;
|
||||
else
|
||||
stack[2] &= ~EFLAG_IF;
|
||||
|
||||
frame->cs = ivt[ip[1] * 2 + 1];
|
||||
frame->eip = ivt[ip[1] * 2];
|
||||
asm volatile("nop");
|
||||
//frame->cs = 0;
|
||||
//frame->eip = real_test;
|
||||
goto done;
|
||||
}
|
||||
goto done;
|
||||
case 0xCF: // IRET
|
||||
frame->eip = stack[0];
|
||||
frame->cs = stack[1];
|
||||
frame->eflags = EFLAG_IF | EFLAG_VM | stack[2];
|
||||
v86_if = (stack[2] & EFLAG_IF) != 0;
|
||||
frame->esp = ((frame->esp & 0xffff) + 6) & 0xffff;
|
||||
goto done;
|
||||
case 0xFA: // CLI
|
||||
v86_if = 0;
|
||||
frame->eip = (uint16_t) (frame->eip + 1);
|
||||
goto done;
|
||||
case 0xFB: // STI
|
||||
v86_if = 1;
|
||||
frame->eip = (uint16_t) (frame->eip + 1);
|
||||
goto done;
|
||||
default:
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
done:
|
||||
vga = (char*)0xb8000 + (160 * 13);
|
||||
vga[0] = 'I'; vga[2] = 'P'; printWord(frame->eip, &vga[4]); vga += 14;
|
||||
vga[0] = 'C'; vga[2] = 'S'; printWord(frame->cs, &vga[4]); vga += 14;
|
||||
vga[0] = 'F'; vga[2] = 'L'; printDword(frame->eflags, &vga[4]); vga += 14;
|
||||
vga = (char*)0xb8000 + (160 * 14);
|
||||
vga[0] = 'S'; vga[2] = 'P'; printWord(frame->esp, &vga[4]); vga += 14;
|
||||
vga[0] = 'S'; vga[2] = 'S'; printWord(frame->ss, &vga[4]); vga += 14;
|
||||
vga = (char*)0xb8000 + (160 * 15);
|
||||
vga[0] = 'E'; vga[2] = 'S'; printWord(frame->es, &vga[4]); vga += 14;
|
||||
vga[0] = 'D'; vga[2] = 'S'; printWord(frame->ds, &vga[4]); vga += 14;
|
||||
vga[0] = 'F'; vga[2] = 'S'; printWord(frame->fs, &vga[4]); vga += 14;
|
||||
vga[0] = 'G'; vga[2] = 'S'; printWord(frame->gs, &vga[4]); vga += 14;
|
||||
}
|
||||
|
||||
extern void timerHandler();
|
||||
extern void keyboardHandler();
|
||||
extern void gpfHandler();
|
||||
extern void unhandled_handler();
|
||||
extern void picInit();
|
||||
void set_system_gate(uint8_t gate, void (*handler)()) {
|
||||
IDT[gate].offset_1 = (uint32_t)handler & 0xFFFF;
|
||||
IDT[gate].offset_2 = ((uint32_t)handler >> 16) & 0xFFFF;
|
||||
IDT[gate].selector = 0x08;
|
||||
IDT[gate].type_attributes = 0x8E;
|
||||
}
|
||||
void set_trap_gate(uint8_t gate, void (*handler)()) {
|
||||
IDT[gate].offset_1 = (uint32_t)handler & 0xFFFF;
|
||||
IDT[gate].offset_2 = ((uint32_t)handler >> 16) & 0xFFFF;
|
||||
IDT[gate].selector = 0x08;
|
||||
IDT[gate].type_attributes = 0x8F;
|
||||
}
|
||||
void setup_interrupts() {
|
||||
IDTR.size = 256*8 - 1;
|
||||
IDTR.offset = (uint32_t)IDT;
|
||||
for (int i = 0; i < 256; i++) {
|
||||
*(uint64_t*)&IDT[i] = 0;
|
||||
}
|
||||
|
||||
for (int i = 0; i < 9; i++) {
|
||||
set_trap_gate(i, unhandled_handler);
|
||||
}
|
||||
for (int i = 10; i < 15; i++) {
|
||||
set_trap_gate(i, unhandled_handler);
|
||||
}
|
||||
for (int i = 16; i < 22; i++) {
|
||||
set_trap_gate(i, unhandled_handler);
|
||||
}
|
||||
|
||||
set_system_gate(0x20, timerHandler);
|
||||
set_system_gate(0x21, keyboardHandler);
|
||||
set_trap_gate(13, gpf_handler_v86);
|
||||
//set_trap_gate(13, gpfHandler);
|
||||
|
||||
asm volatile("lidt %0": : "m"(IDTR));
|
||||
picInit();
|
||||
IRQ_clear_mask(0);
|
||||
IRQ_clear_mask(1);
|
||||
asm volatile("sti");
|
||||
}
|
||||
|
||||
|
||||
struct __attribute__((__packed__)) tss_entry_struct {
|
||||
uint32_t prev_tss;
|
||||
uint32_t esp0;
|
||||
uint32_t ss0;
|
||||
uint32_t esp1;
|
||||
uint32_t ss1;
|
||||
uint32_t esp2;
|
||||
uint32_t ss2;
|
||||
uint32_t cr3;
|
||||
uint32_t eip;
|
||||
uint32_t eflags;
|
||||
uint32_t eax;
|
||||
uint32_t ecx;
|
||||
uint32_t edx;
|
||||
uint32_t ebx;
|
||||
uint32_t esp;
|
||||
uint32_t ebp;
|
||||
uint32_t esi;
|
||||
uint32_t edi;
|
||||
uint32_t es;
|
||||
uint32_t cs;
|
||||
uint32_t ss;
|
||||
uint32_t ds;
|
||||
uint32_t fs;
|
||||
uint32_t gs;
|
||||
uint32_t ldt;
|
||||
uint32_t trap;
|
||||
uint32_t iomap_base;
|
||||
};
|
||||
struct tss_entry_struct *tss_data;
|
||||
void write_tss() {
|
||||
tss_data = (struct tss_entry_struct *)0x20000;
|
||||
for (int i = 0; i < 0x2080; i++)
|
||||
((uint8_t*)tss_data)[i] = 0;
|
||||
tss_data->ss0 = 0x10;
|
||||
tss_data->esp0 = 0x400000;
|
||||
tss_data->iomap_base = 0x80;
|
||||
}
|
||||
|
||||
void enable_sse() {
|
||||
asm volatile(
|
||||
"mov %%cr0, %%eax\n"
|
||||
"and $0xFFFB, %%ax\n"
|
||||
"or $0x2, %%ax\n"
|
||||
"mov %%eax, %%cr0\n"
|
||||
"mov %%cr4, %%eax\n"
|
||||
"or $0x600, %%ax\n"
|
||||
"mov %%eax, %%cr4\n"
|
||||
: : : "%eax"
|
||||
);
|
||||
}
|
||||
|
||||
void print_flags() {
|
||||
uint32_t flags;
|
||||
asm volatile("pushfd\npop %%eax":"=a"(flags));
|
||||
printDword(flags, 0xB8000 + (160*4) + 50);
|
||||
}
|
||||
void print_cr0() {
|
||||
uint32_t reg;
|
||||
asm volatile("mov %%cr0, %%eax":"=a"(reg));
|
||||
printDword(reg, 0xB8000 + (160*5) + 50);
|
||||
}
|
||||
void print_cr3() {
|
||||
uint32_t reg;
|
||||
asm volatile("mov %%cr3, %%eax":"=a"(reg));
|
||||
printDword(reg, 0xB8000 + (160*5) + 50 + 8*2 + 2);
|
||||
}
|
||||
void print_cr4() {
|
||||
uint32_t reg;
|
||||
asm volatile("mov %%cr4, %%eax":"=a"(reg));
|
||||
printDword(reg, 0xB8000 + (160*5) + 50 + 8*4 + 4);
|
||||
}
|
||||
|
||||
extern void enter_v86(uint32_t ss, uint32_t esp, uint32_t cs, uint32_t eip);
|
||||
extern void v86Code();
|
||||
extern void flushTSS();
|
||||
extern void jmp_usermode_test();
|
||||
|
||||
/*
|
||||
Real Mode Accessible (First MB)
|
||||
00000 - 02000 IVT
|
||||
01000 - 04000 Paging
|
||||
04000 - 07C00 Free
|
||||
07C00 - 08000 Boot
|
||||
08000 - 20000 Kernel Code
|
||||
20000 - 22080 TSS
|
||||
80000 - 90000 Real Mode Stack
|
||||
90000 - A0000 Free
|
||||
A0000 - FFFFF BIOS Area
|
||||
Protected Only (1MB+)
|
||||
100000 - Free
|
||||
*/
|
||||
|
||||
void start() {
|
||||
word *vga_text = (word *)0xb8000;
|
||||
char h[] = "LuciaOS";
|
||||
for (int i = 0; i < sizeof(h); i++)
|
||||
*(char *)&vga_text[i] = h[i];
|
||||
|
||||
uint32_t o;
|
||||
asm("mov %%esp, %%eax" : "=a"(o) : :);
|
||||
printDword(o, (short *)&vga_text[80]);
|
||||
asm("mov %%ebp, %%eax" : "=a"(o) : :);
|
||||
printDword(o, (short *)&vga_text[160]);
|
||||
|
||||
//char c[] = "APIC support: ";
|
||||
//char apic;
|
||||
//printByte(apic = check_apic(), (short*)&vga_text[80*3 + sizeof(c) - 1]);
|
||||
//for (int i = 0; i < sizeof(c); i++)
|
||||
// *(char *)&vga_text[i+(80*3)] = c[i];
|
||||
//if (!apic) return;
|
||||
|
||||
char sse_str[] = "SSE support: ";
|
||||
char sse;
|
||||
printByte(sse = check_sse(), (short*)&vga_text[80*4 + sizeof(sse_str) - 1]);
|
||||
for (int i = 0; i < sizeof(sse_str); i++)
|
||||
*(char *)&vga_text[i+(80*4)] = sse_str[i];
|
||||
if (!sse) return;
|
||||
enable_sse();
|
||||
|
||||
setup_interrupts();
|
||||
write_tss();
|
||||
flushTSS();
|
||||
print_flags();
|
||||
print_cr0();
|
||||
print_cr3();
|
||||
print_cr4();
|
||||
FARPTR v86_entry = i386LinearToFp(v86Code);
|
||||
enter_v86(0x8000, 0xFF00, FP_SEG(v86_entry), FP_OFF(v86_entry));
|
||||
//jmp_usermode_test();
|
||||
}
|
||||
|
||||
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Reference in New Issue
Block a user