;* ;* x86_64-bios/bootboot.asm ;* ;* Copyright (C) 2017 - 2020 bzt (bztsrc@gitlab) ;* ;* Permission is hereby granted, free of charge, to any person ;* obtaining a copy of this software and associated documentation ;* files (the "Software"), to deal in the Software without ;* restriction, including without limitation the rights to use, copy, ;* modify, merge, publish, distribute, sublicense, and/or sell copies ;* of the Software, and to permit persons to whom the Software is ;* furnished to do so, subject to the following conditions: ;* ;* The above copyright notice and this permission notice shall be ;* included in all copies or substantial portions of the Software. ;* ;* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, ;* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF ;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND ;* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT ;* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, ;* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ;* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER ;* DEALINGS IN THE SOFTWARE. ;* ;* This file is part of the BOOTBOOT Protocol package. ;* @brief Booting code for BIOS, MultiBoot, El Torito, Linux boot ;* ;* Stage2 loader, compatible with GRUB and BIOS boot specification ;* 1.0.1 (even expansion ROM), El Torito "no emulation" CDROM boot, ;* as well as Linux boot protocol. ;* ;* text segment occupied: 800-7C00, bss: 8000-x ;* ;* Memory map ;* 0h - 600h reserved for the system ;* 600h - 800h stage1 (MBR/VBR, boot.bin) ;* 800h - 6C00h stage2 (this) ;* 6C00h - 7C00h stack (7000h - 700Fh SMP trampoline code) ;* 8000h - 9000h bootboot structure ;* 9000h - A000h environment ;* A000h - B000h disk buffer / PML4 ;* B000h - C000h PDPE, higher half core 4K slots ;* C000h - D000h PDE 4K ;* D000h - E000h PTE 4K ;* E000h - F000h PDPE, 4G physical RAM identity mapped 2M ;* F000h - 10000h PDE 2M ;* 10000h - 11000h PDE 2M ;* 11000h - 12000h PDE 2M ;* 12000h - 13000h PDE 2M ;* 13000h - 14000h PTE 4K ;* 14000h - 9F000h core stacks (1k per core) ;* ;* At first big enough free hole, initrd. Usually at 1Mbyte. ;* ;* WARNING: supports BOOTBOOT Protocol level 1 only (static mappings) ;* BBDEBUG equ 1 format ELF64 ;get Core boot parameter block include "bootboot.inc" ;VBE filter (available, has additional info, color, graphic, linear fb) VBE_MODEFLAGS equ 1+2+8+16+128 ;********************************************************************* ;* Macros * ;********************************************************************* ;Writes a message on screen. macro real_print msg { if ~ msg eq si push si mov si, msg end if call real_printfunc if ~ msg eq si pop si end if } ;protected and real mode are functions, because we have to switch beetween macro real_protmode { USE16 call near real_protmodefunc USE32 } macro prot_realmode { USE32 call near prot_realmodefunc USE16 } ;edx:eax sector, edi:pointer macro prot_readsector { call near prot_readsectorfunc } macro DBG msg { if BBDEBUG eq 1 real_print msg end if } macro DBG32 msg { if BBDEBUG eq 1 prot_realmode real_print msg real_protmode end if } virtual at 0 bpb.jmp db 3 dup 0 bpb.oem db 8 dup 0 bpb.bps dw 0 bpb.spc db 0 bpb.rsc dw 0 bpb.nf db 0 ;16 bpb.nr dw 0 bpb.ts16 dw 0 bpb.media db 0 bpb.spf16 dw 0 ;22 bpb.spt dw 0 bpb.nh dw 0 bpb.hs dd 0 bpb.ts32 dd 0 bpb.spf32 dd 0 ;36 bpb.flg dd 0 bpb.rc dd 0 ;44 bpb.vol db 6 dup 0 bpb.fst db 8 dup 0 ;54 bpb.dmy db 20 dup 0 bpb.fst2 db 8 dup 0 ;84 end virtual virtual at 0 fatdir.name db 8 dup 0 fatdir.ext db 3 dup 0 fatdir.attr db 9 dup 0 fatdir.ch dw 0 fatdir.attr2 dd 0 fatdir.cl dw 0 fatdir.size dd 0 end virtual ;********************************************************************* ;* header * ;********************************************************************* ;offs len desc ; 0 2 expansion ROM magic (AA55h) ; 2 1 size in blocks (40h) ; 3 1 magic E9h ; 4 2 real mode entry point (relative) ; 6 2 checksum ; 8 8 magic 'BOOTBOOT' ; 16 10 zeros, at least one and a padding ; 26 2 pnp ptr, must be zero ; 28 4 flags, must be zero ; 32 32 MultiBoot header with protected mode entry point ; 64 x free to use ;497 127 Linux x86 boot protocol header ;any format can follow. USE16 ORG 800h ;BOOTBOOT stage2 header (64 bytes) public loader loader: db 55h,0AAh ;ROM magic db (loader_end-loader)/512 ;size in 512 blocks .executor: jmp near realmode_start ;entry point .checksum: dw 0 ;checksum .name: db "BOOTBOOT" dw 0 dd 0, 0 .pnpptr: dw 0 .flags: dd 0 MB_MAGIC equ 01BADB002h MB_FLAGS equ 010001h align 8 .mb_header: dd MB_MAGIC ;magic dd MB_FLAGS ;flags dd -(MB_MAGIC+MB_FLAGS) ;checksum (0-magic-flags) dd .mb_header ;our location (GRUB should load us here) dd 0800h ;the same... load start dd 07C00h ;load end dd 0h ;no bss dd multiboot_start ;entry point ;no segments or sections, code comes right after the header ;********************************************************************* ;* code * ;********************************************************************* ;----------------Multiboot stub----------------- USE32 public multiboot_start multiboot_start: cli cld ;clear drive code, initrd ptr and environment xor edx, edx mov edi, 9000h mov dword [edi], edx mov dword [bootboot.initrd_ptr], edx mov dword [bootboot.initrd_size], edx ;no GRUB environment available? cmp eax, 2BADB002h jne @f ;save drive code for boot device mov dl, byte [ebx+12] ;is there a module? mod_count!=0 cmp dword [ebx+20], 0 jz @f ;mod_addr!=0 mov eax, dword [ebx+24] or eax, eax jz @f ;mods[0].end mov ecx, dword [eax+4] sub ecx, dword [eax] mov dword [bootboot.initrd_size], ecx ;mods[0].start mov ecx, dword [eax] mov dword [bootboot.initrd_ptr], ecx inc byte [hasinitrd] ;mod_count>1? cmp dword [ebx+20], 1 jbe @f ;mods[1], copy environment (4k) mov esi, dword [eax+16] mov ecx, 1024 repnz movsd inc byte [hasconfig] @@: lgdt [GDT_value] mov ax, DATA_BOOT ;clear shadow segment registers mov ds, ax mov es, ax mov ss, ax xor esp, esp ;GRUB leaves the upper 16 bits non-zero, we must clear it jmp CODE_BOOT:.real ;load 16 bit mode segment into cs USE16 .real: mov eax, CR0 and eax, 07FFFFFFEh ;switching back to real mode mov CR0, eax xor ax, ax mov ds, ax ;load segment registers DS and CS jmp 0:@f @@: lidt [idt16] ;restore IDT as newer GRUBs mess it up ;fallthrough realmode_start ;-----------realmode-protmode stub------------- public realmode_start realmode_start: cli cld xchg bx, bx mov sp, 7C00h xor ax, ax mov es, ax mov ss, ax ;relocate ourself from ROM to RAM if necessary call .getaddr .getaddr: pop si mov ax, cs or ax, ax jnz .reloc cmp si, .getaddr je .noreloc .reloc: mov ds, ax mov di, loader sub si, .getaddr-loader mov cx, (loader_end-loader)/2 repnz movsw xor ax, ax mov ds, ax jmp 0:.clrdl .noreloc: or dl, dl jnz @f .clrdl: mov dl, 80h @@: mov byte [bootdev], dl ;-----initialize serial port COM1,115200,8N1------ mov ax, 0401h xor bx, bx mov cx, 030Bh xor dx, dx int 14h ; if there's no serial, but BIOS incorrectly sets the IO port for it mov dx, word [400h] or dx, dx jz @f add dx, 5 in al, dx cmp al, 0FFh jne @f mov word [400h], 0 @@: real_print starting ; flush PS/2 keyboard in al, 060h ; read key in al, 061h ; ack out 061h, al DBG dbg_cpu ;-----check CPU----- ;at least 286? pushf pushf pop dx xor dh,40h push dx popf pushf pop bx popf cmp dx, bx jne .cpuerror mov ebp, 200000h ;check for 386 ;look for cpuid instruction pushfd pop eax mov ebx, eax xor eax, ebp and ebx, ebp push eax popfd pushfd pop eax and eax, ebp xor eax, ebx shr eax, 21 and al, 1 jz .cpuerror ;ok, now we can get cpu feature flags mov eax, 1 cpuid shr al, 4 shr ebx, 24 mov word [bootboot.bspid], bx ;look for minimum family cmp ax, 0600h jb .cpuerror ;look for minimum feature flags ;so we have PAE? bt edx, 6 jnc .cpuerror ;what about MSR? bt edx, 5 jnc .cpuerror ;and can we use long mode (LME)? mov eax, 80000000h mov ebp, eax inc ebp cpuid cmp eax, ebp jb .cpuerror mov eax, ebp cpuid ;long mode bt edx, 29 jc cpuok .cpuerror: mov si, noarch jmp real_diefunc ;okay, we can do 64 bit! ;--- Linux x86 boot protocol header --- db 01F1h-($-$$) dup 090h public hdr hdr: setup_sects: db (loader_end-loader-511)/512 root_flags: dw 0 syssize: dd (loader_end-loader)/16 ram_size: dw 0 vid_mode: dw 0 root_dev: dw 0 boot_flag: dw 0AA55h db 0EBh ; short jmp db start_of_setup-@f ; no space to jump to realmode_start directly @@: db "HdrS" dw 020eh realmode_swtch: dd 0 start_sys_seg: dw 0 dw 0 ; we don't have Linux kernel version... type_of_loader: db 0FFh loadflags: db 0 setup_move_size: dw 08000h code32_start: dd 0 ; we dont' use this either... ramdisk_image: dd 0 ramdisk_size: dd 0 bootsect_kludge: dd 0 heap_end_ptr: dd loader_end+1024-512 ; we don't care, we set our stack directly ext_loader_ver: db 0 ext_loader_type: db 0 cmd_line_ptr: dd 0 initrd_addr_max: dd 07fffffffh kernel_alignment: dd 16 relocatable_kernel: db 0 min_alignment: db 4 xloadflags: dw 0 cmdline_size: dd 0 hardware_subarch: dd 0 hardware_subarch_data: dq 0 payload_offset: dd 0 payload_length: dd 0 setup_data: dq 0 pref_address: dq 90000h ; qemu does not handle anything else init_size: dd loader_end-loader handover_offset: dd 0 acpi_rsdp_addr: dq 0 start_of_setup: ; fix: qemu forces address and set CS to 0x9020, but we must jump to segment 0x9000. jmp 9000h:realmode_start-loader ; --- end of Linux boot protocol header --- public cpuok cpuok: DBG dbg_A20 ;-----enable A20----- ;no problem even if a20 is already turned on. mov ax, 2401h ;BIOS enable A20 function int 15h ;see if it worked call a20chk jz a20ok ;keyboard nightmare call a20wait mov al, 0ADh out 64h, al call a20wait mov al, 0D0h out 64h, al call a20wait2 in al, 60h push ax call a20wait mov al, 0D1h out 64h, al call a20wait pop ax or al, 2 out 60h, al call a20wait mov al, 0AEh out 64h, al call a20wait call a20chk jz a20ok ;fast enable method in al, 92h test al, 2 jnz a20ok or al, 2 and al, 0FEh out 92h, al jmp a20ok public a20chk a20chk: push es xor ax, ax dec ax mov es, ax mov ah, byte [es:510h] mov byte [ds:500h], 0 mov byte [es:510h], al mov al, byte [ds:500h] mov byte [es:510h], ah pop es or al, al ret a20wait: in al, 64h test al, 2 jnz a20wait ret a20wait2: in al, 64h test al, 1 jz a20wait2 ret a20ok: ; wait for a key press for half a sec, if pressed use backup initrd mov word [origcount], 0 sti .waitkey: mov ax, word 0100h or al, al ; make sure ZF is clear int 16h jz @f or al, al jz @f ; this blocks, so only call it if we are sure there's a keystroke waiting xor ah, ah int 16h mov eax, ' BAK' mov dword [bkp], eax real_print backup jmp .waitend @@: ; wait 10 millisec xor cx, cx mov dx, 10000 mov ah, 086h int 15h ; repeat loop 50 times inc word [origcount] cmp word [origcount], 50 jl .waitkey .waitend: cli ;-----detect memory map----- public getmemmap getmemmap: DBG dbg_mem xor eax, eax mov edi, bootboot.acpi_ptr mov ecx, 16 repnz stosd cmp byte [hasconfig], 0 jnz @f mov dword [9000h], eax @@: cmp byte [hasinitrd], 0 jnz @f mov dword [bootboot.initrd_ptr], eax mov dword [bootboot.initrd_size], eax @@: mov dword [bootboot.initrd_ptr+4], eax mov dword [bootboot.initrd_size+4], eax mov eax, bootboot_MAGIC mov dword [bootboot.magic], eax mov dword [bootboot.size], 128 mov dword [bootboot.protocol], PROTOCOL_STATIC or LOADER_BIOS mov di, bootboot.fb_ptr mov cx, 800h-28h xor ax, ax repnz stosw mov di, bootboot.mmap xor ebx, ebx clc .nextmap: cmp word [bootboot.size], 4096 jae .nomoremap mov edx, 'PAMS' xor ecx, ecx mov cl, 20 xor eax, eax mov ax, 0E820h int 15h jc .nomoremap cmp eax, 'PAMS' jne .nomoremap ;is this the first memory hole? If so, mark ;ourself as reserved memory cmp dword [di+4], 0 jnz .notfirst cmp dword [di], 0 jnz .notfirst ; "allocate" memory for loader mov eax, 14000h add dword [di], eax sub dword [di+8], eax ;convert E820 memory type to BOOTBOOT memory type .notfirst: mov al, byte [di+16] cmp al, 1 je .noov cmp al, 4 je .isacpi cmp al, 3 jne @f .isacpi: mov al, MMAP_ACPI jmp .noov ; everything else reserved @@: mov al, MMAP_USED .noov: ;copy memory type to size's least significant byte mov byte [di+8], al xor ecx, ecx ;is it ACPI area? cmp al, MMAP_ACPI jne .notacpi mov dword [bootboot.acpi_ptr], edi jmp .entryok ;is it free slot? .notacpi: cmp al, MMAP_FREE jne .notmax .freemem: ;do we have a ramdisk area? cmp dword [bootboot.initrd_ptr], 0 jnz .entryok ;is it big enough for the compressed and the inflated ramdisk? mov ebp, (INITRD_MAXSIZE+2)*1024*1024 shr ebp, 20 shl ebp, 20 ;is this free memory hole big enough? (first fit) .sizechk: mov eax, dword [di+8] ;load size xor al, al mov edx, dword [di+12] and edx, 000FFFFFFh or edx, edx jnz .bigenough cmp eax, ebp jb .entryok .bigenough: mov eax, dword [di] ;save ramdisk pointer mov dword [bootboot.initrd_ptr], eax .entryok: ;get limit of memory mov eax, dword [di+8] ;load size xor al, al mov edx, dword [di+12] add eax, dword [di] ;add base adc edx, dword [di+4] and edx, 000FFFFFFh .notmax: add dword [bootboot.size], 16 ;bubble up entry if necessary push si push di .bubbleup: mov si, di cmp di, bootboot.mmap jbe .swapdone sub di, 16 ;order by base asc mov eax, dword [si+4] cmp eax, dword [di+4] jb .swapmodes jne .swapdone mov eax, dword [si] cmp eax, dword [di] jae .swapdone .swapmodes: push di mov cx, 16/2 @@: mov dx, word [di] lodsw stosw mov word [si-2], dx dec cx jnz @b pop di jmp .bubbleup .swapdone: pop di pop si add di, 16 cmp di, bootboot.mmap+4096 jae .nomoremap .skip: or ebx, ebx jnz .nextmap .nomoremap: cmp dword [bootboot.size], 128 jne .E820ok .noE820: mov si, memerr jmp real_diefunc .E820ok: ;check if we have memory for the ramdisk xor ecx, ecx cmp dword [bootboot.initrd_ptr], ecx jnz .enoughmem .nomem: mov si, noenmem jmp real_diefunc .enoughmem: public systables systables: ;-----detect system structures----- DBG dbg_systab ;do we need that scanning shit? mov eax, dword [bootboot.acpi_ptr] or eax, eax jz @f shr eax, 4 mov es, ax ;no if E820 map was correct cmp dword [es:0], 'XSDT' je .detsmbi cmp dword [es:0], 'RSDT' je .detsmbi @@: inc dx ;get starting address min(EBDA,E0000) mov ah,0C1h stc int 15h mov bx, es jnc @f mov ax, [ebdaptr] @@: cmp ax, 0E000h jb .acpinext mov ax, 0E000h ;detect ACPI ptr .acpinext: mov es, ax cmp dword [es:0], 'RSD ' jne .acpinotf cmp dword [es:4], 'PTR ' jne .acpinotf ;ptr found ; do we have XSDT? cmp dword [es:28], 0 jne .acpi2 cmp dword [es:24], 0 je .acpi1 .acpi2: mov eax, dword [es:24] mov dword [bootboot.acpi_ptr], eax mov edx, dword [es:28] mov dword [bootboot.acpi_ptr+4], edx jmp .chkacpi ; no, fallback to RSDT .acpi1: mov eax, dword [es:16] @@: mov dword [bootboot.acpi_ptr], eax xor edx, edx jmp .chkacpi .acpinotf: xor eax, eax mov ax, es inc ax cmp ax, 0A000h jne @f add ax, 03000h @@: ;end of 1Mb? or ax, ax jnz .acpinext mov si, noacpi jmp real_diefunc .chkacpi: ; check if memory is marked as ACPI in the memory map mov esi, bootboot.mmap mov edi, bootboot.magic add edi, dword [bootboot.size] .nextmm: cmp edx, dword [si+4] jne .skipmm mov ebx, dword [si] cmp eax, ebx jl .skipmm add ebx, dword [si+8] and bl, 0F0h cmp eax, ebx jge .skipmm mov al, byte [si+8] and al, 0F0h or al, MMAP_ACPI mov byte [si+8], al jmp .detsmbi .skipmm: add si, 16 cmp si, di jl .nextmm ;detect SMBios tables .detsmbi: xor eax, eax mov ax, 0E000h xor dx, dx .smbnext: mov es, ax push ax cmp dword [es:0], '_SM_' je .smbfound cmp dword [es:0], '_MP_' jne .smbnotf shl eax, 4 mov dword [bootboot.mp_ptr], eax bts dx, 2 jmp .smbnotf .smbfound: shl eax, 4 mov dword [bootboot.smbi_ptr], eax bts dx, 1 .smbnotf: pop ax bt ax, 0 mov bx, ax and bx, 03h inc ax ;end of 1Mb? or ax, ax jnz .smbnext ;restore ruined es .detend: push ds pop es DBG dbg_time ; ------- BIOS date and time ------- mov ah, 4 int 1Ah jc .nobtime ;ch century ;cl year xchg ch, cl mov word [bootboot.datetime], cx ;dh month ;dl day xchg dh, dl mov word [bootboot.datetime+2], dx mov ah, 2 int 1Ah jc .nobtime ;ch hour ;cl min xchg ch, cl mov word [bootboot.datetime+4], cx ;dh sec ;dl daylight saving on/off xchg dh, dl mov word [bootboot.datetime+6], dx .nobtime: ;---- enable protmode ---- cli cld lgdt [GDT_value] mov eax, cr0 or al, 1 mov cr0, eax jmp CODE_PROT:protmode_start ;---- enable protmode on APs ---- public ap_trampoline ap_trampoline: ;--this code will be relocated to the SIPI address -- cli cld jmp 0:ap_start ;--relocation end-- ap_start: xor ax, ax mov ds, ax lgdt [GDT_value] mov eax, cr0 or al, 1 mov cr0, eax jmp CODE_PROT:@f USE32 @@: mov ax, DATA_PROT mov ds, ax mov es, ax mov fs, ax mov gs, ax mov ss, ax ; spinlock until BSP finishes @@: pause cmp byte [bsp_done], 0 jz @b jmp longmode_init ;writes the reason, waits for a key and reboots. public prot_diefunc prot_diefunc: prot_realmode USE16 public real_diefunc real_diefunc: push si real_print loader.name real_print panic pop si call real_printfunc mov si, crlf call real_printfunc call real_getchar mov al, 0FEh out 64h, al jmp far 0FFFFh:0 ;invoke BIOS POST routine ; get a character from keyboard or from serial line public real_getchar real_getchar: pushf sti push si push di .chkser: cmp word [400h], 0 jz @f mov ah, byte 03h xor dx, dx int 14h bt ax, 8 jnc @f mov ah, byte 02h xor dx, dx int 14h jmp .gotch @@: mov ah, byte 01h int 16h jz .chkser xor ah, ah int 16h .gotch: pop di pop si popf xor ah, ah ret ;ds:si zero terminated string to write public real_printfunc real_printfunc: lodsb or al, al jz .end push si push ax mov ah, byte 0Eh mov bx, word 11 int 10h pop ax cmp word [400h], 0 jz @f mov ah, byte 01h xor dx, dx int 14h @@: pop si jmp real_printfunc .end: ret public real_protmodefunc real_protmodefunc: cli ;get return address xor ebp, ebp pop bp mov dword [hw_stack], esp lgdt [GDT_value] mov eax, cr0 ;enable protected mode or al, 1 mov cr0, eax jmp CODE_PROT:.init USE32 .init: mov ax, DATA_PROT mov ds, ax mov es, ax mov fs, ax mov gs, ax mov ss, ax mov esp, dword [hw_stack] jmp ebp public prot_realmodefunc prot_realmodefunc: cli ;get return address pop ebp ;save stack pointer mov dword [hw_stack], esp jmp CODE_BOOT:.back ;load 16 bit mode segment into cs USE16 .back: mov eax, CR0 and al, 0FEh ;switching back to real mode mov CR0, eax xor ax, ax mov ds, ax ;load registers 2nd turn mov es, ax mov ss, ax jmp 0:.back2 .back2: mov sp, word [hw_stack] sti jmp bp USE32 public prot_readsectorfunc prot_readsectorfunc: push eax push ecx push esi push edi ;load 8 sectors (1 page) or more in low memory mov dword [lbapacket.sect0], eax prot_realmode ;try all drives from bootdev-87 to support RAID mirror mov dl, byte [bootdev] mov byte [readdev], dl mov byte [cntdev], 0 mov byte [iscdrom], 0 .again: mov ax, word [lbapacket.count] mov word [origcount], ax mov dl, byte [readdev] ;don't use INT 13h / AX=4B01h, that's buggy on many BIOSes cmp dl, 0E0h jl @f ;use 2048 byte sectors instead of 512 if it's a cdrom mov al, byte [lbapacket.sect0] and al, 011b or al, al jz .cdok ;this should never happen. ; - GPT is loaded from PMBR, from LBA 0 (%4==0) ; - ESP is at LBA 128 or 2048 (%4==0) ; - root dir is at LBA 172 (%4==0) for FAT16, and it's cluster aligned for FAT32 ; - cluster size is multiple of 4 sectors mov si, notcdsect jmp real_diefunc .cdok: shr dword [lbapacket.sect0], 2 add word [lbapacket.count], 3 shr word [lbapacket.count], 2 mov byte [iscdrom], 1 @@: mov ah, byte 42h mov esi, lbapacket clc int 13h jnc .rdok ;we do not expect this to fail, but if so, load sector from another ;drive assuming we have a RAID mirror. This will fail for non-RAIDs mov al, byte [readdev] inc al cmp al, 87h jle @f mov al, 80h @@: mov byte [readdev], al inc byte [cntdev] cmp byte [cntdev], 8 jle .again .rdok: xor ebx, ebx mov bl, ah real_protmode pop edi or edi, edi jz @f push edi ;and copy to addr where it wanted to be (maybe in high memory) mov esi, dword [lbapacket.addr] xor ecx, ecx mov cx, word [origcount] shl ecx, 7 repnz movsd pop edi @@: pop esi pop ecx pop eax ret public prot_hex2bin prot_hex2bin: xor eax, eax xor ebx, ebx @@: mov bl, byte [esi] cmp bl, '0' jb @f cmp bl, '9' jbe .num cmp bl, 'A' jb @f cmp bl, 'F' ja @f sub bl, 7 .num: sub bl, '0' shl eax, 4 add eax, ebx inc esi dec cx jnz @b @@: ret public prot_dec2bin prot_dec2bin: xor eax, eax xor ebx, ebx xor edx, edx mov ecx, 10 @@: mov bl, byte [esi] cmp bl, '0' jb @f cmp bl, '9' ja @f mul ecx sub bl, '0' add eax, ebx inc esi jmp @b @@: ret ;IN: eax=str ptr, ecx=length OUT: eax=num public prot_oct2bin prot_oct2bin: push ebx push edx mov ebx, eax xor eax, eax xor edx, edx @@: shl eax, 3 mov dl, byte[ebx] sub dl, '0' add eax, edx inc ebx dec ecx jnz @b pop edx pop ebx ret ; IN: al, character to send public uart_send uart_send: mov ah, al mov dx, word [400h] ;3fdh add dx, 5 @@: pause in al, dx and al, 20h jz @b sub dx, 5 mov al, ah out dx, al ret ; IN: edi pointer to store the received char public uart_getc uart_getc: mov dx, word [400h] ;3fdh add dx, 5 @@: pause in al, dx and al, 1 jz @b sub dl, 5 in al, dx stosb ret public protmode_start protmode_start: xchg bx, bx mov ax, DATA_PROT mov ds, ax mov es, ax mov fs, ax mov gs, ax mov ss, ax mov esp, 7C00h ; ------- Locate initrd -------- cmp byte [hasinitrd], 0 jnz .initrdrom mov esi, 0C8000h .nextrom: cmp word [esi], 0AA55h jne @f cmp dword [esi+8], 'INIT' jne @f cmp word [esi+12], 'RD' jne @f mov ecx, dword [esi+16] mov dword [bootboot.initrd_size], ecx add esi, 32 cmp word [esi], 08b1fh je .initrdrom ; copy from ROM to RAM mov edi, dword [bootboot.initrd_ptr] repnz movsb jmp .noinflate @@: add esi, 2048 cmp esi, 0F4000h jb .nextrom ;---- notify raspbootcom / USBImager to send the initrd over serial line ---- cmp word [400h], 0 jz .getgpt mov al, 3 call uart_send call uart_send call uart_send ; wait for response with timeout mov ah, al mov cx, 10000 mov dx, word [400h] add dx, 5 @@: dec cx jz .getgpt pause in al, dx and al, 1 jz @b DBG32 dbg_serial ; read the initrd's size mov edi, bootboot.initrd_size call uart_getc call uart_getc call uart_getc call uart_getc mov ecx, dword [bootboot.initrd_size] ; send negative or positive acknowledge cmp ecx, 32 jb .se cmp ecx, INITRD_MAXSIZE*1024*1024 jb .ok .se: mov al, 'S' call uart_send mov al, 'E' call uart_send jmp .getgpt .ok: mov al, 'O' call uart_send mov al, 'K' call uart_send mov edi, dword [bootboot.initrd_ptr] ; read in the image @@: call uart_getc dec ecx jnz @b jmp .initrdloaded ;---- read GPT ----- .getgpt: xor eax, eax xor edi, edi prot_readsector if BBDEBUG eq 1 cmp byte [iscdrom], 0 jz @f DBG32 dbg_cdrom jmp .isgpt @@: DBG32 dbg_gpt .isgpt: end if mov esi, 0A000h+512 cmp dword [esi], 'EFI ' je @f .nogpt: mov esi, nogpt jmp prot_diefunc @@: mov edi, 0B000h mov ebx, edi mov ecx, 896 repnz movsd mov esi, ebx mov ecx, dword [esi+80] ;number of entries mov ebx, dword [esi+84] ;size of one entry add esi, 512 mov edx, esi ;first entry mov dword [gpt_ent], ebx mov dword [gpt_num], ecx mov dword [gpt_ptr], edx ; first, look for a partition with bootable flag mov esi, edx @@: cmp dword [esi], 0 ;failsafe, jump to parttype search jne .notz cmp dword [esi+32], 0 jz .nextgpt .notz: bt word [esi+48], 2 ;EFI_PART_USED_BY_OS? jc .loadesp2 add esi, ebx dec ecx jnz @b ; if none, look for specific partition types .nextgpt: mov esi, dword [gpt_ptr] mov ebx, dword [gpt_ent] mov ecx, dword [gpt_num] mov eax, 0C12A7328h mov edx, 011D2F81Fh @@: cmp dword [esi], eax ;GUID match? jne .note cmp dword [esi+4], edx je .loadesp .note: cmp dword [esi], 'OS/Z' ;or OS/Z root partition for this architecture? jne .noto cmp word [esi+4], 08664h jne .noto cmp dword [esi+12], 'root' je .loadesp .noto: add esi, ebx dec ecx jnz @b .nopart: mov esi, nopar jmp prot_diefunc ; load ESP at free memory hole found .loadesp: mov dword [gpt_ptr], esi mov dword [gpt_num], ecx .loadesp2: mov ecx, dword [esi+40] ;last sector mov eax, dword [esi+32] ;first sector mov edx, dword [esi+36] or edx, edx jnz .nextgpt or ecx, ecx jz .nextgpt or eax, eax jz .nextgpt mov dword [bpb_sec], eax ;load BPB mov edi, dword [bootboot.initrd_ptr] mov word [lbapacket.count], 8 prot_readsector ;parse fat on EFI System Partition @@: cmp dword [edi + bpb.fst2], 'FAT3' je .isfat cmp dword [edi + bpb.fst], 'FAT1' je .isfat ;no, then it's an initrd on the entire partition or eax, eax jz .nopart or ecx, ecx jz .nopart sub ecx, eax shl ecx, 9 mov dword [bootboot.initrd_size], ecx ; load INITRD from partition dec ecx shr ecx, 12 mov edi, dword [bootboot.initrd_ptr] @@: add edi, 4096 prot_readsector add eax, 8 dec ecx jnz @b jmp .initrdloaded .isfat: cmp word [edi + bpb.bps], 512 jne .nextgpt ;calculations xor eax, eax xor ebx, ebx xor ecx, ecx xor edx, edx mov bx, word [edi + bpb.spf16] or bx, bx jnz @f mov ebx, dword [edi + bpb.spf32] @@: mov al, byte [edi + bpb.nf] mov cx, word [edi + bpb.rsc] ;data_sec = numFat*secPerFat mul ebx ;data_sec += reservedSec add eax, ecx ;data_sec += ESPsec add eax, dword [bpb_sec] mov dword [data_sec], eax mov dword [root_sec], eax xor eax, eax mov al, byte [edi + bpb.spc] mov dword [clu_sec], eax ;FAT16 ;data_sec += (numRootEnt*32+511)/512 cmp word [edi + bpb.spf16], 0 je .fat32bpb cmp byte [edi + bpb.fst + 4], '6' jne .nextgpt xor eax, eax mov ax, word [edi + bpb.nr] shl eax, 5 add eax, 511 shr eax, 9 add dword [data_sec], eax mov byte [fattype], 0 xor ecx, ecx mov cx, word [edi + bpb.spf16] jmp .loadfat .fat32bpb: ;FAT32 ;root_sec += (rootCluster-2)*secPerCluster mov eax, dword [edi + bpb.rc] sub eax, 2 xor edx, edx mov ebx, dword [clu_sec] mul ebx add dword [root_sec], eax mov byte [fattype], 1 mov ecx, dword [edi + bpb.spf32] ;load FAT .loadfat: xor eax, eax mov ax, word [edi+bpb.rsc] add eax, dword [bpb_sec] shr ecx, 3 inc ecx mov edi, 0x10000 mov word [lbapacket.count], 8 @@: prot_readsector add edi, 4096 add eax, 8 dec ecx jnz @b mov ax, word [clu_sec] mov word [lbapacket.count], ax ;load root directory mov eax, dword [root_sec] mov edi, dword [bootboot.initrd_ptr] prot_readsector ;look for BOOTBOOT directory mov esi, edi mov eax, 'BOOT' mov ecx, 255 .nextroot: cmp dword [esi], eax jne @f cmp dword [esi+4], eax jne @f cmp word [esi+8], ' ' je .foundroot @@: add esi, 32 cmp byte [esi], 0 jz .nextgpt dec ecx jnz .nextroot jmp .nextgpt .foundroot: xor eax, eax cmp byte [fattype], 0 jz @f mov ax, word [esi + fatdir.ch] shl eax, 16 @@: mov ax, word [esi + fatdir.cl] ;sec = (cluster-2)*secPerCluster+data_sec sub eax, 2 mov ebx, dword [clu_sec] mul ebx add eax, dword [data_sec] mov edi, dword [bootboot.initrd_ptr] prot_readsector ;look for CONFIG and INITRD mov esi, edi mov ecx, 255 mov edx, dword [bkp] .nextdir: cmp dword [esi], 'CONF' jne .notcfg cmp dword [esi+4], 'IG ' jne .notcfg cmp dword [esi+7], ' ' jne .notcfg ; load environment from FS0:/BOOTBOOT/CONFIG push edx push esi push edi push ecx mov ecx, dword [esi + fatdir.size] cmp ecx, 4095 jbe @f mov ecx, 4095 @@: mov dword [core_len], ecx xor eax, eax cmp byte [fattype], 0 jz @f mov ax, word [esi + fatdir.ch] shl eax, 16 @@: mov ax, word [esi + fatdir.cl] mov edi, 9000h .nextcfg: push eax ;sec = (cluster-2)*secPerCluster+data_sec sub eax, 2 mov ebx, dword [clu_sec] mov word [lbapacket.count], bx mul ebx shl ebx, 9 add eax, dword [data_sec] push ebx prot_readsector pop ebx pop eax add edi, ebx sub ecx, ebx js .cfgloaded jz .cfgloaded ;get next cluster from FAT cmp byte [fattype], 0 jz @f shl eax, 2 add eax, 0x10000 mov eax, dword [eax] jmp .nextcfg @@: shl eax, 1 add eax, 0x10000 mov ax, word [eax] and eax, 0FFFFh jmp .nextcfg .cfgloaded: pop ecx pop edi pop esi pop edx xor eax, eax mov ecx, 4096 sub ecx, dword [core_len] mov edi, 9000h add edi, dword [core_len] repnz stosb mov dword [core_len], eax mov byte [9FFFh], al jmp .notinit .notcfg: cmp dword [esi], 'X86_' jne @f cmp dword [esi+4], '64 ' je .altinitrd @@: cmp dword [esi], 'INIT' jne .notinit cmp dword [esi+4], 'RD ' jne .notinit cmp dword [esi+7], edx jne .notinit .altinitrd: mov ecx, dword [esi + fatdir.size] mov dword [bootboot.initrd_size], ecx xor eax, eax cmp byte [fattype], 0 jz @f mov ax, word [esi + fatdir.ch] shl eax, 16 @@: mov ax, word [esi + fatdir.cl] jmp .loadinitrd .notinit: add esi, 32 cmp byte [esi], 0 jz .loadinitrd dec ecx jnz .nextdir .noinitrd: mov esi, nord jmp prot_diefunc ;load cluster chain, eax=cluster, ecx=size .loadinitrd: mov edi, dword [bootboot.initrd_ptr] .nextclu: push eax ;sec = (cluster-2)*secPerCluster+data_sec sub eax, 2 mov ebx, dword [clu_sec] mov word [lbapacket.count], bx mul ebx shl ebx, 9 add eax, dword [data_sec] push ebx prot_readsector pop ebx pop eax add edi, ebx sub ecx, ebx js .initrdloaded jz .initrdloaded ;get next cluster from FAT cmp byte [fattype], 0 jz @f shl eax, 2 add eax, 0x10000 mov eax, dword [eax] jmp .nextclu @@: shl eax, 1 add eax, 0x10000 mov ax, word [eax] and eax, 0FFFFh jmp .nextclu .initrdloaded: DBG32 dbg_initrd mov esi, dword [bootboot.initrd_ptr] .initrdrom: mov edi, dword [bootboot.initrd_ptr] cmp word [esi], 08b1fh jne .noinflate DBG32 dbg_gzinitrd mov ebx, esi mov eax, dword [bootboot.initrd_size] add ebx, eax sub ebx, 4 mov ecx, dword [ebx] mov dword [bootboot.initrd_size], ecx add edi, eax add edi, 4095 shr edi, 12 shl edi, 12 add eax, ecx cmp eax, (INITRD_MAXSIZE+2)*1024*1024 jb @f mov esi, nogzmem jmp prot_diefunc @@: mov dword [bootboot.initrd_ptr], edi ; inflate initrd xor eax, eax add esi, 2 lodsb cmp al, 8 jne tinf_err lodsb mov bl, al add esi, 6 test bl, 4 jz @f lodsw add esi, eax @@: test bl, 8 jz .noname @@: lodsb or al, al jnz @b .noname: test bl, 16 jz .nocmt @@: lodsb or al, al jnz @b .nocmt: test bl, 2 jz @f add esi, 2 @@: call tinf_uncompress .noinflate: ;round up to page size mov eax, dword [bootboot.initrd_size] add eax, 4095 shr eax, 12 shl eax, 12 mov dword [bootboot.initrd_size], eax ;do we have an environment configuration? mov ebx, 9000h cmp byte [ebx], 0 jnz .parsecfg ;-----load /sys/config------ mov edx, fsdrivers .nextfs1: xor ebx, ebx mov bx, word [edx] or bx, bx jz .errfs1 mov esi, dword [bootboot.initrd_ptr] mov ecx, dword [bootboot.initrd_size] add ecx, esi mov edi, cfgfile push edx call ebx pop edx or ecx, ecx jnz .fscfg add edx, 2 jmp .nextfs1 .fscfg: mov edi, 9000h add ecx, 3 shr ecx, 2 repnz movsd .errfs1: ;do we have an environment configuration? mov ebx, 9000h cmp byte [ebx], 0 jz .noconf ;parse .parsecfg: push ebx DBG32 dbg_env pop esi jmp .getnext ;skip comments .nextvar: cmp byte[esi], '#' je .skipcom cmp word[esi], '//' jne @f add esi, 2 .skipcom: lodsb cmp al, 10 je .getnext cmp al, 13 je .getnext or al, al jz .parseend cmp esi, 0A000h ja .parseend jmp .skipcom @@: cmp word[esi], '/*' jne @f .skipcom2: inc esi cmp word [esi-2], '*/' je .getnext cmp byte [esi], 0 jz .parseend cmp esi, 0A000h ja .parseend jmp .skipcom2 ;only match on beginning of line @@: cmp esi, 9000h je @f cmp byte [esi-1], ' ' je @f cmp byte [esi-1], 13 jae .next ;parse screen dimensions @@: cmp dword[esi], 'scre' jne @f cmp word[esi+4], 'en' jne @f cmp byte[esi+6], '=' jne @f add esi, 7 call prot_dec2bin mov dword [reqwidth], eax inc esi call prot_dec2bin mov dword [reqheight], eax jmp .getnext ;get kernel's filename @@: cmp dword[esi], 'kern' jne @f cmp word[esi+4], 'el' jne @f cmp byte[esi+6], '=' jne @f add esi, 7 mov edi, kernel .copy: lodsb or al, al jz .copyend cmp al, ' ' jz .copyend cmp al, 13 jbe .copyend cmp esi, 0A000h ja .copyend cmp edi, loader_end-1 jae .copyend stosb jmp .copy .copyend: xor al, al stosb jmp .getnext @@: cmp dword[esi], 'nosm' jne .next cmp word[esi+4], 'p=' jne .next cmp byte[esi+6], '1' jne .next mov byte[nosmp], 1 .next: inc esi ;failsafe .getnext: cmp esi, 0A000h jae .parseend cmp byte [esi], 0 je .parseend ;skip white spaces cmp byte [esi], ' ' je @b cmp byte [esi], 13 jbe @b jmp .nextvar .noconf: mov edi, ebx mov ecx, 1024 xor eax, eax repnz stosd mov dword [ebx+0], '// N' mov dword [ebx+4], '/A' or (10 shl 16) .parseend: ;-----load /sys/core------ mov edx, fsdrivers .nextfs: xor ebx, ebx mov bx, word [edx] or bx, bx jz .errfs mov esi, dword [bootboot.initrd_ptr] mov ecx, dword [bootboot.initrd_size] add ecx, esi mov edi, kernel push edx call ebx pop edx or ecx, ecx jnz .coreok add edx, 2 jmp .nextfs .errfs2: mov esi, nocore jmp prot_diefunc .errfs: ; if all drivers failed, search for the first elf executable DBG32 dbg_scan mov esi, dword [bootboot.initrd_ptr] mov ecx, dword [bootboot.initrd_size] add ecx, esi dec esi @@: inc esi cmp esi, ecx jae .errfs2 cmp dword [esi], 5A2F534Fh ; OS/Z magic je .alt cmp dword [esi], 464C457Fh ; ELF magic je .alt cmp word [esi], 5A4Dh ; MZ magic jne @b mov eax, dword [esi+0x3c] cmp eax, 65536 jnl @b add eax, esi cmp dword [eax], 00004550h ; PE magic jne @b cmp word [eax+4], 8664h ; x86_64 jne @b cmp word [eax+20], 20Bh jne @b .alt: cmp word [esi+4], 0102h ;lsb 64 bit jne @b cmp word [esi+18], 62 ;x86_64 jne @b cmp word [esi+0x38], 0 ;e_phnum > 0 jz @b .coreok: ; parse PE cmp word [esi], 5A4Dh ; MZ magic jne .tryelf mov ebx, esi cmp dword [esi+0x3c], 65536 jnl .badcore add esi, dword [esi+0x3c] cmp dword [esi], 00004550h ; PE magic jne .badcore cmp word [esi+4], 8664h ; x86_64 architecture jne .badcore cmp word [esi+20], 20Bh ; PE32+ format jne .badcore DBG32 dbg_pe mov eax, dword [esi+36] ; entry point mov dword [entrypoint], eax mov dword [entrypoint+4], 0FFFFFFFFh mov ecx, eax sub ecx, dword [esi+40] ; - code base add ecx, dword [esi+24] ; + text size add ecx, dword [esi+28] ; + data size mov edx, dword [esi+32] ; bss size shr eax, 31 jz .badcore jmp .mkcore ; parse ELF .tryelf: cmp dword [esi], 5A2F534Fh ; OS/Z magic je @f cmp dword [esi], 464C457Fh ; ELF magic jne .badcore @@: cmp word [esi+4], 0102h ;lsb 64 bit, little endian jne .badcore cmp word [esi+18], 62 ;x86_64 architecture je @f .badcore: mov esi, badcore jmp prot_diefunc @@: DBG32 dbg_elf mov ebx, esi mov eax, dword [esi+0x18] mov dword [entrypoint], eax mov eax, dword [esi+0x18+4] mov dword [entrypoint+4], eax ;parse ELF binary mov cx, word [esi+0x38] ; program header entries phnum mov eax, dword [esi+0x20] ; program header add esi, eax sub esi, 56 inc cx .nextph: add esi, 56 dec cx jz .badcore cmp word [esi], 1 ; p_type, loadable jne .nextph cmp word [esi+22], 0FFFFh ; p_vaddr == negative address jne .nextph ;got it add ebx, dword [esi+8] ; + P_offset mov ecx, dword [esi+32] ; p_filesz ; hack to keep symtab and strtab for shared libraries cmp byte [ebx+16], 3 jne @f add ecx, 04000h @@: mov edx, dword [esi+40] ; p_memsz sub edx, ecx ;ebx=ptr to core segment, ecx=segment size, edx=bss size .mkcore: or ecx, ecx jz .badcore mov eax, ecx add eax, edx cmp eax, 2*1024*1024 - 256*1024 - 2*4096; 2M minus stack for 256 cores minus bootboot and environment jl @f mov esi, bigcore jmp prot_diefunc @@: mov edi, dword [bootboot.initrd_ptr] add edi, dword [bootboot.initrd_size] mov dword [core_ptr], edi mov dword [core_len], ecx ;copy code from segment after initrd mov esi, ebx mov ebx, ecx and bl, 3 shr ecx, 2 repnz movsd or bl, bl jz @f mov cl, bl repnz movsb ;zero out bss @@: or edx, edx jz @f add dword [core_len], edx xor eax, eax mov ecx, edx and dl, 3 shr ecx, 2 repnz stosd or dl, dl jz @f mov cl, dl repnz stosb ;round up to page size @@: mov eax, dword [core_len] add eax, 4095 shr eax, 12 shl eax, 12 mov dword [core_len], eax ;exclude initrd area and core from free mmap mov esi, bootboot.mmap mov ebx, dword [bootboot.initrd_ptr] mov edx, dword [core_ptr] add edx, eax mov cx, 248 ; initrd+core (ebx..edx) .nextfree: cmp dword [esi], ebx ja .excludeok mov eax, dword [esi+8] and al, 0F0h add eax, dword [esi] cmp edx, eax ja .notini ; +--------------+ ; ####### cmp dword [esi], ebx jne .splitmem ; ptr = initrd_ptr+initrd_size+core_len mov dword [esi], edx sub edx, ebx and dl, 0F0h ; size -= initrd_size+core_len sub dword [esi+8], edx jmp .excludeok ; +--+ +----------+ ; ####### .splitmem: mov edi, bootboot.magic add edi, dword [bootboot.size] add dword [bootboot.size], 16 @@: mov eax, dword [edi-16] mov dword [edi], eax mov eax, dword [edi-12] mov dword [edi+4], eax mov eax, dword [edi-8] mov dword [edi+8], eax mov eax, dword [edi-4] mov dword [edi+12], eax sub edi, 16 cmp edi, esi ja @b mov eax, ebx sub eax, dword [esi] sub dword [esi+24], eax inc al mov dword [esi+8], eax mov dword [esi+16], edx sub edx, ebx sub dword [esi+24], edx jmp .excludeok .notini: add esi, 16 dec cx jnz .nextfree .excludeok: ; -------- SMP --------- ; clear LAPIC address and logical core id list mov edi, lapic_ptr mov ecx, 512/4+1 xor eax, eax repnz stosd ; clear flags mov byte [bsp_done], al cmp byte [nosmp], al jne .nosmp ; try ACPI first mov esi, dword [bootboot.acpi_ptr] or esi, esi jz .trymp mov edx, 4 cmp byte [esi], 'X' ; XSDT has 8 bytes pointers, but we can only access 4G jne @f mov edx, 8 @@: mov ecx, dword [esi+4] add esi, 024h sub ecx, 024h .nextsdt: mov ebx, dword [esi] add esi, edx cmp dword [ebx], 'APIC' ; look for MADT je .madt sub ecx, edx or ecx, ecx jz .trymp jmp .nextsdt ; MADT found. .madt: mov eax, dword [ebx+24h] mov dword [lapic_ptr], eax ; madt.lapic_address mov ecx, dword [ebx+4] sub ecx, 2ch add ebx, 2ch mov edi, lapic_ids .nextmadtentry: cmp word [bootboot.numcores], 256 jae .dosmp cmp byte [ebx], 0 ; madt_entry.type: is it a Local APIC Processor? jne @f xor ax, ax mov al, byte [ebx+2] ; madt_entry.lapicproc.lapicid stosw ; ACPI table holds 1 byte id, but internally we have 2 bytes inc word [bootboot.numcores] @@: xor eax, eax mov al, byte [ebx+1] ; madt_entry.size or al, al jz .dosmp add ebx, eax sub ecx, eax cmp ecx, 0 jg .nextmadtentry jmp .dosmp .trymp: ; in lack of ACPI, try legacy MP structures mov esi, dword [bootboot.mp_ptr] or esi, esi jz .nosmp mov esi, dword [esi+4] cmp dword [esi], 'PCMP' jne .nosmp mov eax, dword [esi+36] ; pcmp.lapic_address mov dword [lapic_ptr], eax mov cx, word [esi+34] ; pcmp.numentries add esi, 44 ; pcmp header length mov edi, lapic_ids .nextpcmpentry: cmp word [bootboot.numcores], 256 jae .dosmp cmp byte [esi], 0 ; pcmp_entry.type: is it a Local APIC Processor? jne @f xor ax, ax mov al, byte [esi+1] ; pcmp_entry.lapicproc.lapicid stosw ; PCMP has 1 byte id, but we use 2 bytes internally inc word [bootboot.numcores] add esi, 12 @@: add esi, 8 dec cx jnz .nextpcmpentry ; send IPI and SIPI .dosmp: cmp word [bootboot.numcores], 2 jb .nosmp DBG32 dbg_smp ; relocate AP trampoline mov esi, ap_trampoline mov edi, 7000h mov ecx, (ap_start-ap_trampoline+3)/4 repnz movsd ; send Broadcast INIT IPI mov esi, dword [lapic_ptr] add esi, 300h mov eax, 0C4500h mov dword [esi], eax ; wait 10 millisec prot_realmode xor cx, cx mov dx, 10000 mov ah, 086h sti int 15h cli real_protmode ; send Broadcast STARTUP IPI mov eax, 0C4607h ; start at 0700:0000h mov dword [esi], eax ; wait 200 microsec prot_realmode xor cx, cx mov dx, 200 mov ah, 086h sti int 15h cli real_protmode mov eax, 0C4607h ; second SIPI mov dword [esi], eax .nosmp: ; failsafe cmp word [bootboot.numcores], 0 jnz @f inc word [bootboot.numcores] mov ax, word [bootboot.bspid] mov word [lapic_ids], ax @@: ; remove core stacks from memory map xor eax, eax mov ax, word [bootboot.numcores] shl eax, 10 mov edi, bootboot.mmap add dword [edi], eax sub dword [edi+8], eax ; ------- set video resolution ------- prot_realmode DBG dbg_vesa xor ax, ax mov es, ax ;get VESA VBE2.0 info mov ax, 4f00h mov di, 0A000h mov dword [di], 'VBE2' ;this call requires a big stack int 10h cmp ax, 004fh je @f .viderr: mov si, novbe jmp real_diefunc ;read dword pointer and copy string to 1st 64k ;available video modes @@: xor esi, esi xor edi, edi mov si, word [0A000h+0Eh] mov ax, word [0A000h+10h] mov ds, ax xor ax, ax mov es, ax mov di, 0A000h+400h mov cx, 64 @@: lodsw cmp ax, 0ffffh je @f or ax, ax jz @f stosw dec cx jnz @b @@: xor ax, ax stosw ;iterate on modes mov si, 0A000h+400h .nextmode: mov di, 0A000h+800h xor ax, ax mov word [0A000h+802h], ax ; vbe mode lodsw or ax, ax jz .viderr mov cx, ax mov ax, 4f01h push bx push cx push si push di int 10h pop di pop si pop cx pop bx cmp ax, 004fh jne .viderr bts cx, 13 bts cx, 14 mov ax, word [0A000h+800h] ; vbe flags and ax, VBE_MODEFLAGS cmp ax, VBE_MODEFLAGS jne .nextmode ;check memory model (direct) cmp byte [0A000h+81bh], 6 jne .nextmode ;check bpp cmp byte [0A000h+819h], 32 jne .nextmode ;check min width mov ax, word [reqwidth] cmp ax, 640 ja @f mov ax, 640 @@: cmp word [0A000h+812h], ax jne .nextmode ;check min height mov ax, word [reqheight] cmp ax, 480 ja @f mov ax, 480 @@: cmp word [0A000h+814h], ax jb .nextmode ;match? go no further .match: xor edx, edx xor ebx, ebx xor eax, eax mov bx, word [0A000h+810h] mov word [bootboot.fb_scanline], bx mov ax, word [0A000h+812h] mov word [bootboot.fb_width], ax mov ax, word [0A000h+814h] mov word [bootboot.fb_height], ax mul ebx mov dword [bootboot.fb_size], eax mov eax, dword [0A000h+828h] mov dword [bootboot.fb_ptr], eax mov byte [bootboot.fb_type],FB_ARGB ; blue offset cmp byte [0A000h+824h], 0 je @f mov byte [bootboot.fb_type],FB_RGBA cmp byte [0A000h+824h], 8 je @f mov byte [bootboot.fb_type],FB_ABGR cmp byte [0A000h+824h], 16 je @f mov byte [bootboot.fb_type],FB_BGRA @@: ; set video mode mov bx, cx bts bx, 14 ;flat linear mov ax, 4f02h int 10h cmp ax, 004fh jne .viderr ;no debug output after this point ;inform firmware that we're about to leave it's realm mov ax, 0EC00h mov bx, 2 ; 64 bit int 15h real_protmode ; -------- paging --------- ;map core at higher half of memory ;address 0xffffffffffe00000 xor eax, eax mov edi, 0A000h mov ecx, (14000h+256*1024-0A000h)/4 repnz stosd ;PML4 mov edi, 0A000h ;pointer to 2M PDPE (first 4G RAM identity mapped) mov dword [edi], 0E003h ;pointer to 4k PDPE (core mapped at -2M) mov dword [edi+4096-8], 0B003h ;4K PDPE mov edi, 0B000h mov dword [edi+4096-8], 0C003h ;4K PDE mov edi, 0C000h+3840 mov eax, dword[bootboot.fb_ptr] ;map framebuffer mov al,83h mov ecx, 31 @@: stosd add edi, 4 add eax, 2*1024*1024 dec ecx jnz @b mov dword [0C000h+4096-8], 0D003h ;4K PT mov dword[0D000h], 08001h ;map bootboot mov dword[0D008h], 09001h ;map configuration mov edi, 0D010h mov eax, dword[core_ptr] ;map core text segment inc eax mov ecx, dword[core_len] shr ecx, 12 inc ecx @@: stosd add edi, 4 add eax, 4096 dec ecx jnz @b ;map core stacks (one page per 4 cores) mov edi, 0DFF8h mov eax, 014003h mov cx, word [bootboot.numcores] add cx, 3 shr cx, 2 @@: mov dword[edi], eax sub edi, 8 add eax, 1000h dec cx jnz @b ;identity mapping ;2M PDPE mov edi, 0E000h mov dword [edi], 0F003h mov dword [edi+8], 010003h mov dword [edi+16], 011003h mov dword [edi+24], 012003h ;2M PDE mov edi, 0F000h xor eax, eax mov al, 83h mov ecx, 512* 4;G RAM @@: stosd add edi, 4 add eax, 2*1024*1024 dec ecx jnz @b ;first 2M mapped by page mov dword [0F000h], 013003h mov edi, 013000h mov eax, 3 mov ecx, 512 @@: stosd add edi, 4 add eax, 4096 dec ecx jnz @b ;generate new 64 bit gdt mov edi, GDT_table+8 ;8h core code xor eax, eax ;supervisor mode (ring 0) mov ax, 0FFFFh stosd mov eax, 00209800h stosd ;10h core data xor eax, eax ;flat data segment mov ax, 0FFFFh stosd mov eax, 00809200h stosd ;18h mandatory tss xor eax, eax ;required by vt-x mov al, 068h stosd mov eax, 00008900h stosd xor eax, eax stosd stosd ;Enter long mode cli mov al, 0FFh ;disable PIC out 021h, al out 0A1h, al in al, 70h ;disable NMI or al, 80h out 70h, al ;release AP spinlock inc byte [bsp_done] ;don't use stack below this line public longmode_init longmode_init: xchg bx, bx mov eax, 1101101000b ;Set PAE, MCE, PGE; OSFXSR, OSXMMEXCPT (enable SSE) mov cr4, eax mov eax, 0A000h mov cr3, eax mov ecx, 0C0000080h ;EFER MSR rdmsr or eax, 100h ;enable long mode wrmsr mov eax, 0C0000011h ;clear EM, MP (enable SSE) and WP mov cr0, eax ;enable paging with cache disabled lgdt [GDT_value] ;read 80 bit address jmp @f nop @@: jmp 8:@f USE64 @@: xor eax, eax ;load long mode segments mov ax, 10h mov ds, ax mov es, ax mov ss, ax mov fs, ax mov gs, ax ; find out our lapic id mov eax, 1 cpuid shr ebx, 24 mov edx, ebx ; get array index for it xor rbx, rbx mov rsi, lapic_ids mov cx, word [bootboot.numcores] @@: lodsw cmp ax, dx je @f inc ebx dec cx jnz @b xor rbx, rbx @@: shl rbx, 10 ; 1k stack for each core ; set stack and call _start() in sys/core xor rsp, rsp ;sp = core_num * -1024 sub rsp, rbx xchg bx, bx jmp qword[entrypoint] nop nop nop nop USE32 include "fs.inc" include "tinf.inc" ;encryption support for FS/Z ; --- SHA-256 --- public sha_init sha_init: xor eax, eax mov dword [sha_l], eax mov dword [sha_b], eax mov dword [sha_b+4], eax mov dword [sha_s ], 06a09e667h mov dword [sha_s+ 4], 0bb67ae85h mov dword [sha_s+ 8], 03c6ef372h mov dword [sha_s+12], 0a54ff53ah mov dword [sha_s+16], 0510e527fh mov dword [sha_s+20], 09b05688ch mov dword [sha_s+24], 01f83d9abh mov dword [sha_s+28], 05be0cd19h ret ; IN: ebx = buffer, ecx = length public sha_upd sha_upd: push esi or ecx, ecx jz .end mov esi, ebx mov edi, dword [sha_l] add edi, sha_d ; for(;len--;d++) { ; ctx->d[ctx->l++]=*d; .next: movsb inc byte [sha_l] ; if(ctx->l==64) { cmp byte [sha_l], 64 jne @f ; sha256_t(ctx); call sha_final.sha_t ; SHA_ADD(ctx->b[0],ctx->b[1],512); add dword [sha_b], 512 adc dword [sha_b+4], 0 ; ctx->l=0; mov byte [sha_l], 0 sub edi, 64 ; } @@: dec ecx jnz .next .end: pop esi ret ; IN: edi = output buffer public sha_final sha_final: push esi push edi mov ebx, edi ; i=ctx->l; ctx->d[i++]=0x80; mov edi, dword [sha_l] mov ecx, edi add edi, sha_d mov al, 80h stosb xor eax, eax ; if(ctx->l<56) {while(i<56) ctx->d[i++]=0x00;} cmp cl, 56 jae @f neg ecx add ecx, 63 xor al, al repnz stosb jmp .padded @@: ; else {while(i<64) ctx->d[i++]=0x00;sha256_t(ctx);memset(ctx->d,0,56);} stosb call .sha_t push ecx mov ecx, 56/4 repnz stosd pop ecx inc cl cmp cl, 64 jne @b .padded: ; SHA_ADD(ctx->b[0],ctx->b[1],ctx->l*8); mov eax, dword [sha_l] shl eax, 3 add dword [sha_b], eax adc dword [sha_b+4], 0 ; ctx->d[63]=ctx->b[0];ctx->d[62]=ctx->b[0]>>8;ctx->d[61]=ctx->b[0]>>16;ctx->d[60]=ctx->b[0]>>24; mov eax, dword [sha_b] bswap eax mov dword [sha_d+60], eax ; ctx->d[59]=ctx->b[1];ctx->d[58]=ctx->b[1]>>8;ctx->d[57]=ctx->b[1]>>16;ctx->d[56]=ctx->b[1]>>24; mov eax, dword [sha_b+4] bswap eax mov dword [sha_d+56], eax ; sha256_t(ctx); call .sha_t ; for(i=0;i<4;i++) { ; h[i] =(ctx->s[0]>>(24-i*8)); h[i+4] =(ctx->s[1]>>(24-i*8)); ; h[i+8] =(ctx->s[2]>>(24-i*8)); h[i+12]=(ctx->s[3]>>(24-i*8)); ; h[i+16]=(ctx->s[4]>>(24-i*8)); h[i+20]=(ctx->s[5]>>(24-i*8)); ; h[i+24]=(ctx->s[6]>>(24-i*8)); h[i+28]=(ctx->s[7]>>(24-i*8)); ; } mov edi, ebx mov esi, sha_s mov cl, 8 @@: lodsd bswap eax stosd dec cl jnz @b pop edi pop esi ret ; private func, sha transform .sha_t: push esi push edi push edx push ecx push ebx ; for(i=0,j=0;i<16;i++,j+=4) m[i]=(ctx->d[j]<<24)|(ctx->d[j+1]<<16)|(ctx->d[j+2]<<8)|(ctx->d[j+3]); mov cl, 16 mov edi, _m mov esi, sha_d @@: lodsd bswap eax stosd dec cl jnz @b ; for(;i<64;i++) m[i]=SHA_SIG1(m[i-2])+m[i-7]+SHA_SIG0(m[i-15])+m[i-16]; mov cl, 48 ; SHA_SIG0[m[i-15]) (SHA_ROTR(x,7)^SHA_ROTR(x,18)^((x)>>3)) @@: mov eax, dword [edi-15*4] mov ebx, eax mov edx, eax ror eax, 7 ror ebx, 18 shr edx, 3 xor eax, ebx xor eax, edx ; SHA_SIG1(m[i-2]) (SHA_ROTR(x,17)^SHA_ROTR(x,19)^((x)>>10)) mov ebx, dword [edi-2*4] mov edx, ebx ror ebx, 17 ror edx, 19 xor ebx, edx rol edx, 19 shr edx, 10 xor ebx, edx add eax, ebx ; m[i-7] add eax, dword [edi-7*4] ; m[i-16] add eax, dword [edi-16*4] stosd dec cl jnz @b ; a=ctx->s[0];b=ctx->s[1];c=ctx->s[2];d=ctx->s[3]; ; e=ctx->s[4];f=ctx->s[5];g=ctx->s[6];h=ctx->s[7]; xor ecx, ecx mov cl, 8 mov esi, sha_s mov edi, _a repnz movsd ; for(i=0;i<64;i++) { mov esi, _m @@: ; t1=h+SHA_EP1(e)+SHA_CH(e,f,g)+sha256_k[i]+m[i]; mov eax, dword [_h] mov dword [t1], eax ; SHA_EP1(e) (SHA_ROTR(x,6)^SHA_ROTR(x,11)^SHA_ROTR(x,25)) mov eax, dword [_e] mov ebx, eax ror eax, 6 ror ebx, 11 xor eax, ebx ror ebx, 14 ; 25 = 11+14 xor eax, ebx add dword [t1], eax ; SHA_CH(e,f,g) (((x)&(y))^(~(x)&(z))) mov eax, dword [_e] mov ebx, eax not ebx and eax, dword [_f] and ebx, dword [_g] xor eax, ebx add dword [t1], eax ; sha256_k[i] mov eax, dword [sha256_k+4*ecx] add dword [t1], eax ; m[i] lodsd add dword [t1], eax ; t2=SHA_EP0(a)+SHA_MAJ(a,b,c); ; SHA_EP0(a) (SHA_ROTR(x,2)^SHA_ROTR(x,13)^SHA_ROTR(x,22)) mov eax, dword [_a] mov ebx, eax ror eax, 2 ror ebx, 13 xor eax, ebx ror ebx, 9 ; 22 = 13+9 xor eax, ebx mov dword [t2], eax ; SHA_MAJ(a,b,c) (((x)&(y))^((x)&(z))^((y)&(z))) mov eax, dword [_a] mov edx, dword [_c] mov ebx, eax and eax, dword [_b] and ebx, edx xor eax, ebx mov ebx, dword [_b] and ebx, edx xor eax, ebx add dword [t2], eax ; h=g;g=f;f=e;e=d+t1;d=c;c=b;b=a;a=t1+t2; mov eax, dword [_g] mov dword [_h], eax mov eax, dword [_f] mov dword [_g], eax mov eax, dword [_e] mov dword [_f], eax mov eax, dword [_d] add eax, dword [t1] mov dword [_e], eax mov eax, dword [_c] mov dword [_d], eax mov eax, dword [_b] mov dword [_c], eax mov eax, dword [_a] mov dword [_b], eax mov eax, dword [t1] add eax, dword [t2] mov dword [_a], eax ; } inc cl cmp cl, 64 jne @b ; ctx->s[0]+=a;ctx->s[1]+=b;ctx->s[2]+=c;ctx->s[3]+=d; ; ctx->s[4]+=e;ctx->s[5]+=f;ctx->s[6]+=g;ctx->s[7]+=h; mov cl, 8 mov esi, _a mov edi, sha_s @@: lodsd add dword [edi], eax add edi, 4 dec cl jnz @b pop ebx pop ecx pop edx pop edi pop esi xor eax, eax ret ; --- CRC-32c --- ; IN: esi = buffer, ecx = length ; OUT: edx = crc public crc32_calc crc32_calc: xor edx, edx xor eax, eax xor ebx, ebx or cx, cx jz .end .next: lodsb mov bl, dl xor bl, al mov eax, edx shr edx, 8 xor edx, dword [crclkp+4*ebx] dec cx jnz .next .end: ret ;********************************************************************* ;* Data * ;********************************************************************* ;global descriptor table align 16 public GDT_table GDT_table: dd 0, 0 ;null descriptor DATA_PROT = $-GDT_table dd 0000FFFFh,008F9200h ;flat ds DATA_BOOT = $-GDT_table dd 0000FFFFh,00009200h ;16 bit legacy real mode ds CODE_BOOT = $-GDT_table dd 0000FFFFh,00009800h ;16 bit legacy real mode cs CODE_PROT = $-GDT_table dd 0000FFFFh,00CF9A00h ;32 bit prot mode ring0 cs dd 00000068h,00CF8900h ;32 bit TSS, not used but required public GDT_value GDT_value: dw $-GDT_table dd GDT_table dd 0,0 ;lookup tables for initrd encryption dw 0 public crclkp crclkp: dd 000000000h, 0F26B8303h, 0E13B70F7h, 01350F3F4h, 0C79A971Fh, 035F1141Ch, 026A1E7E8h, 0D4CA64EBh dd 08AD958CFh, 078B2DBCCh, 06BE22838h, 09989AB3Bh, 04D43CFD0h, 0BF284CD3h, 0AC78BF27h, 05E133C24h dd 0105EC76Fh, 0E235446Ch, 0F165B798h, 0030E349Bh, 0D7C45070h, 025AFD373h, 036FF2087h, 0C494A384h dd 09A879FA0h, 068EC1CA3h, 07BBCEF57h, 089D76C54h, 05D1D08BFh, 0AF768BBCh, 0BC267848h, 04E4DFB4Bh dd 020BD8EDEh, 0D2D60DDDh, 0C186FE29h, 033ED7D2Ah, 0E72719C1h, 0154C9AC2h, 0061C6936h, 0F477EA35h dd 0AA64D611h, 0580F5512h, 04B5FA6E6h, 0B93425E5h, 06DFE410Eh, 09F95C20Dh, 08CC531F9h, 07EAEB2FAh dd 030E349B1h, 0C288CAB2h, 0D1D83946h, 023B3BA45h, 0F779DEAEh, 005125DADh, 01642AE59h, 0E4292D5Ah dd 0BA3A117Eh, 04851927Dh, 05B016189h, 0A96AE28Ah, 07DA08661h, 08FCB0562h, 09C9BF696h, 06EF07595h dd 0417B1DBCh, 0B3109EBFh, 0A0406D4Bh, 0522BEE48h, 086E18AA3h, 0748A09A0h, 067DAFA54h, 095B17957h dd 0CBA24573h, 039C9C670h, 02A993584h, 0D8F2B687h, 00C38D26Ch, 0FE53516Fh, 0ED03A29Bh, 01F682198h dd 05125DAD3h, 0A34E59D0h, 0B01EAA24h, 042752927h, 096BF4DCCh, 064D4CECFh, 077843D3Bh, 085EFBE38h dd 0DBFC821Ch, 02997011Fh, 03AC7F2EBh, 0C8AC71E8h, 01C661503h, 0EE0D9600h, 0FD5D65F4h, 00F36E6F7h dd 061C69362h, 093AD1061h, 080FDE395h, 072966096h, 0A65C047Dh, 05437877Eh, 04767748Ah, 0B50CF789h dd 0EB1FCBADh, 0197448AEh, 00A24BB5Ah, 0F84F3859h, 02C855CB2h, 0DEEEDFB1h, 0CDBE2C45h, 03FD5AF46h dd 07198540Dh, 083F3D70Eh, 090A324FAh, 062C8A7F9h, 0B602C312h, 044694011h, 05739B3E5h, 0A55230E6h dd 0FB410CC2h, 0092A8FC1h, 01A7A7C35h, 0E811FF36h, 03CDB9BDDh, 0CEB018DEh, 0DDE0EB2Ah, 02F8B6829h dd 082F63B78h, 0709DB87Bh, 063CD4B8Fh, 091A6C88Ch, 0456CAC67h, 0B7072F64h, 0A457DC90h, 0563C5F93h dd 0082F63B7h, 0FA44E0B4h, 0E9141340h, 01B7F9043h, 0CFB5F4A8h, 03DDE77ABh, 02E8E845Fh, 0DCE5075Ch dd 092A8FC17h, 060C37F14h, 073938CE0h, 081F80FE3h, 055326B08h, 0A759E80Bh, 0B4091BFFh, 0466298FCh dd 01871A4D8h, 0EA1A27DBh, 0F94AD42Fh, 00B21572Ch, 0DFEB33C7h, 02D80B0C4h, 03ED04330h, 0CCBBC033h dd 0A24BB5A6h, 0502036A5h, 04370C551h, 0B11B4652h, 065D122B9h, 097BAA1BAh, 084EA524Eh, 07681D14Dh dd 02892ED69h, 0DAF96E6Ah, 0C9A99D9Eh, 03BC21E9Dh, 0EF087A76h, 01D63F975h, 00E330A81h, 0FC588982h dd 0B21572C9h, 0407EF1CAh, 0532E023Eh, 0A145813Dh, 0758FE5D6h, 087E466D5h, 094B49521h, 066DF1622h dd 038CC2A06h, 0CAA7A905h, 0D9F75AF1h, 02B9CD9F2h, 0FF56BD19h, 00D3D3E1Ah, 01E6DCDEEh, 0EC064EEDh dd 0C38D26C4h, 031E6A5C7h, 022B65633h, 0D0DDD530h, 00417B1DBh, 0F67C32D8h, 0E52CC12Ch, 01747422Fh dd 049547E0Bh, 0BB3FFD08h, 0A86F0EFCh, 05A048DFFh, 08ECEE914h, 07CA56A17h, 06FF599E3h, 09D9E1AE0h dd 0D3D3E1ABh, 021B862A8h, 032E8915Ch, 0C083125Fh, 0144976B4h, 0E622F5B7h, 0F5720643h, 007198540h dd 0590AB964h, 0AB613A67h, 0B831C993h, 04A5A4A90h, 09E902E7Bh, 06CFBAD78h, 07FAB5E8Ch, 08DC0DD8Fh dd 0E330A81Ah, 0115B2B19h, 0020BD8EDh, 0F0605BEEh, 024AA3F05h, 0D6C1BC06h, 0C5914FF2h, 037FACCF1h dd 069E9F0D5h, 09B8273D6h, 088D28022h, 07AB90321h, 0AE7367CAh, 05C18E4C9h, 04F48173Dh, 0BD23943Eh dd 0F36E6F75h, 00105EC76h, 012551F82h, 0E03E9C81h, 034F4F86Ah, 0C69F7B69h, 0D5CF889Dh, 027A40B9Eh dd 079B737BAh, 08BDCB4B9h, 0988C474Dh, 06AE7C44Eh, 0BE2DA0A5h, 04C4623A6h, 05F16D052h, 0AD7D5351h public sha256_k sha256_k: dd 0428a2f98h, 071374491h, 0b5c0fbcfh, 0e9b5dba5h, 03956c25bh, 059f111f1h, 0923f82a4h, 0ab1c5ed5h dd 0d807aa98h, 012835b01h, 0243185beh, 0550c7dc3h, 072be5d74h, 080deb1feh, 09bdc06a7h, 0c19bf174h dd 0e49b69c1h, 0efbe4786h, 00fc19dc6h, 0240ca1cch, 02de92c6fh, 04a7484aah, 05cb0a9dch, 076f988dah dd 0983e5152h, 0a831c66dh, 0b00327c8h, 0bf597fc7h, 0c6e00bf3h, 0d5a79147h, 006ca6351h, 014292967h dd 027b70a85h, 02e1b2138h, 04d2c6dfch, 053380d13h, 0650a7354h, 0766a0abbh, 081c2c92eh, 092722c85h dd 0a2bfe8a1h, 0a81a664bh, 0c24b8b70h, 0c76c51a3h, 0d192e819h, 0d6990624h, 0f40e3585h, 0106aa070h dd 019a4c116h, 01e376c08h, 02748774ch, 034b0bcb5h, 0391c0cb3h, 04ed8aa4ah, 05b9cca4fh, 0682e6ff3h dd 0748f82eeh, 078a5636fh, 084c87814h, 08cc70208h, 090befffah, 0a4506cebh, 0bef9a3f7h, 0c67178f2h public idt16 idt16: dw 3FFh dq 0 public lbapacket lbapacket: ;lba packet for BIOS .size: dw 10h .count: dw 8 .addr: dd 0A000h .sect0: dd 0 .sect1: dd 0 public spc_packet spc_packet: db 18h dup 0 public reqwidth reqwidth: dd 1024 public reqheight reqheight: dd 768 public ebdaptr ebdaptr: dd 0 public hw_stack hw_stack: dd 0 public bpb_sec bpb_sec: dd 0 ;ESP's first sector public root_sec root_sec: dd 0 ;root directory's first sector public data_sec data_sec: dd 0 ;first data sector public clu_sec clu_sec: dd 0 ;sector per cluster public origcount origcount: dw 0 public bootdev bootdev: db 0 public readdev readdev: db 0 public cntdev cntdev: db 0 public hasinitrd hasinitrd: db 0 public hasconfig hasconfig: db 0 public iscdrom iscdrom: db 0 public nosmp nosmp: db 0 public bsp_done bsp_done: ;flag to indicate APs can run public fattype fattype: db 0 public bkp bkp: dd ' ' if BBDEBUG eq 1 dbg_cpu db " * Detecting CPU",10,13,0 dbg_A20 db " * Enabling A20",10,13,0 dbg_mem db " * E820 Memory Map",10,13,0 dbg_systab db " * System tables",10,13,0 dbg_time db " * System time",10,13,0 dbg_serial db " * Initrd over serial",10,13,0 dbg_gpt db " * Reading GPT",10,13,0 dbg_cdrom db " * Detected CDROM boot",10,13,0 dbg_env db " * Environment",10,13,0 dbg_initrd db " * Initrd loaded",10,13,0 dbg_gzinitrd db " * Gzip compressed initrd",10,13,0 dbg_scan db " * Autodetecting kernel",10,13,0 dbg_elf db " * Parsing ELF64",10,13,0 dbg_pe db " * Parsing PE32+",10,13,0 dbg_smp db " * SMP init",10,13,0 dbg_vesa db " * Screen VESA VBE",10,13,0 end if backup: db " * Backup initrd",10,13,0 passphrase: db " * Passphrase? ",0 decrypting: db 13," * Decrypting...",0 clrdecrypt: db 13," ",13,0 public starting starting: db "Booting OS..." crlf: db 10,13,0 public panic panic: db "-PANIC: ",0 public noarch noarch: db "Hardware not supported",0 public a20err a20err: db "Failed to enable A20",0 public memerr memerr: db "E820 memory map not found",0 public nogzmem nogzmem: db "Inflating: " public noenmem noenmem: db "Not enough memory",0 public noacpi noacpi: db "ACPI not found",0 public nogpt nogpt: db "No GPT found",0 public nopar nopar: db "No boot partition",0 public nord nord: db "Initrd not found",0 public nolib nolib: db "/sys not found in initrd",0 public nocore nocore: db "Kernel not found in initrd",0 public badcore badcore: db "Kernel is not a valid executable",0 public bigcore bigcore: db "Kernel is too big",0 public novbe novbe: db "VESA VBE error, no framebuffer",0 public nogzip nogzip: db "Unable to uncompress",0 public notcdsect notcdsect: db "Not 2048 sector aligned",0 public nocipher nocipher: db "Unsupported cipher",10,13,0 public badpass badpass: db 13,"BOOTBOOT-ERROR: Bad passphrase",10,13,0 public cfgfile cfgfile: db "sys/config",0,0,0 public kernel kernel: db "sys/core" db (64-($-kernel)) dup 0 ;-----------padding to be multiple of 512---------- db (511-($-loader+511) mod 512) dup 0 public loader_end loader_end: ;-----------BIOS checksum------------ chksum = 0 repeat $-loader load b byte from (loader+%-1) chksum = (chksum + b) mod 100h end repeat store byte (100h-chksum) at (loader.checksum) ;-----------bss area----------- entrypoint: dq ? core_ptr: dd ? core_len: dd ? gpt_ptr: dd ? gpt_num: dd ? gpt_ent: dd ? lapic_ptr: dd ? lapic_ids: tinf_bss_start: d_end: dd ? d_lzOff: dd ? d_dict_ring:dd ? d_dict_size:dd ? d_dict_idx: dd ? d_tag: db ? d_bitcount: db ? d_bfinal: db ? d_curlen: dw ? d_ltree: d_ltree_table: dw 16 dup ? d_ltree_trans: dw 288 dup ? d_dtree: d_dtree_table: dw 16 dup ? d_dtree_trans: dw 288 dup ? offs: dw 16 dup ? num: dw ? lengths: db 320 dup ? hlit: dw ? hdist: dw ? hclen: dw ? tinf_bss_end: virtual at tinf_bss_start pass: db 256 dup ? sha_d: db 64 dup ? sha_l: dd ? sha_b: dd 2 dup ? sha_s: dd 8 dup ? _a: dd ? _b: dd ? _c: dd ? _d: dd ? _e: dd ? _f: dd ? _g: dd ? _h: dd ? t1: dd ? t2: dd ? _m: dd 64 dup ? chk: db 32 dup ? iv: db 32 dup ? pl: dd ? _i: dd ? end virtual ;-----------bound check------------- ;fasm will generate an error if the code ;is bigger than it should be db 07C00h-4096-($-loader) dup ?