diff options
Diffstat (limited to 'boot')
| -rw-r--r-- | boot/GDT.asm | 76 | ||||
| -rw-r--r-- | boot/Makefile | 16 | ||||
| -rw-r--r-- | boot/check_a20_16.asm | 61 | ||||
| -rw-r--r-- | boot/common_pm.asm | 86 | ||||
| -rw-r--r-- | boot/disk_load_16.asm | 281 | ||||
| -rw-r--r-- | boot/kernel_entry.asm | 20 | ||||
| -rw-r--r-- | boot/memmap.asm | 57 | ||||
| -rw-r--r-- | boot/mp.asm | 37 | ||||
| -rw-r--r-- | boot/pm.asm | 36 | ||||
| -rw-r--r-- | boot/print_string_16.asm | 115 | ||||
| -rw-r--r-- | boot/stage2.asm | 247 | ||||
| -rw-r--r-- | boot/vesa_setup_16.asm | 92 |
12 files changed, 0 insertions, 1124 deletions
diff --git a/boot/GDT.asm b/boot/GDT.asm deleted file mode 100644 index cc33c45..0000000 --- a/boot/GDT.asm +++ /dev/null @@ -1,76 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -; Global Descriptor Table -; we have the null descriptor and a code and data block for a start -; -; 0x80 code segment -; 0x10 data segment -; -; this file contains pure data -; -; -; -; - -gdt_start: - -gdt_null: ;null descriptor (2 x 4 bytes) - dd 0x0 - dd 0x0 - -gdt_code: - ; flags: - ; present: 1 / privilege: 00 / type: 1 - ; code: 1 / conforming: 0 / readable: 1 / accessed: 0 - ; granularity: 1 / 16-bit default: 1 / 64-bit seg: 0 / AVL: 0 - dw 0xffff ;limit - dw 0x0 ;base - db 0x0 ;base - db 10011010b ;flags - db 11001111b ;flags & seg.limit - db 0x0 ;base - -gdt_data: - ; flags: - ; code: 0 / expand down: 0 / writable: 1 / accessed: 0 - dw 0xffff - dw 0x0 - db 0x0 - db 10010010b - db 10001111b - db 0x0 - -gdt16_code: - ; flags: - ; present: 1 / privilege: 00 / type: 1 - ; code: 1 / conforming: 0 / readable: 1 / accessed: 0 - ; granularity: 1 / 16-bit default: 1 / 64-bit seg: 0 / AVL: 0 - dw 0xffff ;limit - dw 0x0 ;base - db 0x0 ;base - db 10011010b ;flags - db 10001111b ;flags & seg.limit - db 0x0 ;base - -gdt16_data: - ; flags: - ; code: 0 / expand down: 0 / writable: 1 / accessed: 0 - dw 0xffff - dw 0x0 - db 0x0 - db 10010010b - db 11001111b - db 0x0 - -gdt_end: - -gdt_descriptor: - dw gdt_end-gdt_start-1 - dd gdt_start - -CODE_SEG equ gdt_code - gdt_start -DATA_SEG equ gdt_data - gdt_start -CODE16_SEG equ gdt16_code - gdt_start -DATA16_SEG equ gdt16_data - gdt_start diff --git a/boot/Makefile b/boot/Makefile deleted file mode 100644 index 17dc454..0000000 --- a/boot/Makefile +++ /dev/null @@ -1,16 +0,0 @@ -#master boot record - -include ../Makefile.common - -STAGE2=stage2.bin - -ASM_SOURCES=$(wildcard *.asm) - -$(STAGE2): $(ASM_SOURCES) - -clean: - -rm $(STAGE2) - - - - diff --git a/boot/check_a20_16.asm b/boot/check_a20_16.asm deleted file mode 100644 index 43da6e3..0000000 --- a/boot/check_a20_16.asm +++ /dev/null @@ -1,61 +0,0 @@ -; The following code is public domain licensed - -[bits 16] - -; Function: check_a20 -; -; Purpose: to check the status of the a20 line in a completely self-contained state-preserving way. -; The function can be modified as necessary by removing push's at the beginning and their -; respective pop's at the end if complete self-containment is not required. -; -; Returns: 0 in ax if the a20 line is disabled (memory wraps around) -; 1 in ax if the a20 line is enabled (memory does not wrap around) - -check_a20: - pushf - push ds - push es - push di - push si - - cli - - xor ax, ax ; ax = 0 - mov es, ax - - not ax ; ax = 0xFFFF - mov ds, ax - - mov di, 0x0500 - mov si, 0x0510 - - mov al, byte [es:di] - push ax - - mov al, byte [ds:si] - push ax - - mov byte [es:di], 0x00 - mov byte [ds:si], 0xFF - - cmp byte [es:di], 0xFF - - pop ax - mov byte [ds:si], al - - pop ax - mov byte [es:di], al - - mov ax, 0 - je check_a20__exit - - mov ax, 1 - -check_a20__exit: - pop si - pop di - pop es - pop ds - popf - - ret diff --git a/boot/common_pm.asm b/boot/common_pm.asm deleted file mode 100644 index c96e1a8..0000000 --- a/boot/common_pm.asm +++ /dev/null @@ -1,86 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -;print_string_pm -;print_hex_pm -; -; -; - -[bits 32] - -VIDEO_MEM equ 0xb8000 -WHITE_ON_BLACK equ 0x0f - -;global data -STR_HEX_OUT_PM: - db "0x0000",0 - -; print [ebx] at ecx -print_string_pm: - pusha - mov edx, VIDEO_MEM - add edx,ecx - print_string_pm_loop: - mov al,[ebx] - mov ah, WHITE_ON_BLACK - cmp al,0 - je print_string_pm_done - mov [edx],ax - add ebx,1 - add edx,2 - jmp print_string_pm_loop - -print_string_pm_done: - popa - ret - -;print_hex_pm routine (dx) at ecx -;will print the value of the bx register as hex to the screen -print_hex_pm: - - pusha - - - ;begin with last hex val (hex_out[5]) - mov bx,STR_HEX_OUT_PM+5 - - ;lets loop throuth all 4 'digits' - print_hex_pm_loop: - - ;get least significan hex digit to cx - mov cx,dx - and cx,0x000F - - ;check range (0-9 vs a-f) - cmp cx,10 - jl print_hex_pm_setnum - - ;set hex a-f - mov al,'A'-10 - add al,cl - jmp print_hex_pm_al - - ;set hex 0-9 - print_hex_pm_setnum: - mov al,'0' - add al,cl - - ; set hex_out[bx] to al - print_hex_pm_al: - mov [bx],al - - ;proceed with the next significant hex 'digit' - dec bx - shr dx,4 - - ;check if finished (otherwise loop) - cmp bx,STR_HEX_OUT_PM+1 - jne print_hex_pm_loop - - ;output complete hex string and return to caller - popa - mov bx,STR_HEX_OUT_PM - call print_string_pm - ret diff --git a/boot/disk_load_16.asm b/boot/disk_load_16.asm deleted file mode 100644 index 52912f4..0000000 --- a/boot/disk_load_16.asm +++ /dev/null @@ -1,281 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -;disk_load_16 -; - -[bits 16] - -STR_ERROR: - db "Disk Read Error",0 - -STR_SPACE: - db " ",0 - -STR_OK: - db "Kernel Loaded",0 -STR_PROGRESS: - db ".",0 - -bpbSectorsPerTrack: - dw 18 - -bpbHeadsPerCylinder: - dw 2 - -LBA: - dw 10 ; current lba - -disk_load_16: - - ; check if LBA is supported - mov ah,0x41 - mov bx,0x55aa - int 0x13 - jnc disk_load_lba - jmp disk_load_chs - - -;####################### - -disk_load_lba: - - pusha - - mov bx,0x1800 ;target es:bx - mov es,bx - mov bx,0 - - next_sectors_lba: - - jmp skip_debug_lba - ;show es - target - pusha - mov bx,es - - ;mov al,bh - ;call print_hex_byte - - ;mov al,bl - ;call print_hex_byte - - mov bx,[LBA] - - mov al,bh - call print_hex_byte - - mov al,bl - call print_hex_byte - - popa - ;-- - - skip_debug_lba: - - mov [lba_addr_sector],es - mov ax,[LBA] - mov [lba_first_sector],ax - - mov dl,[BOOT_DRIVE] - - mov ah,0x42 - mov bx,0 - mov ds,bx - lea si,[lba_adr] - int 0x13 - jc disk_read_error - - mov bx,es - add bx,0x0800 - - mov ax,[LBA] - add ax,64 ; 64 sectors = 0x2000*4 bytes ;16 sectors this is 0x200*0x10 butes - mov [LBA],ax - - cmp bx,0x9000 - je disk_load_finish - - mov es,bx ;next target es:bx - mov bx,0 - - jmp next_sectors_lba - -;####################### - - -disk_load_chs: - - pusha - - ; get boot drive geometry - mov ah,8 - mov dl,[BOOT_DRIVE] - int 0x13 - - add dh,1 - and cl,0x3f - - mov [bpbSectorsPerTrack],cl - mov [bpbHeadsPerCylinder],dh - ; - - ;show geometry - mov al,dh - call print_hex_byte - - mov bx, STR_SPACE - call print_string - - mov al,cl - call print_hex_byte - - call print_nextline - popa - ; - - pusha - - - mov bx,0x1800 ;target es:bx - mov es,bx - mov bx,0 - - next_sectors_chs: - - ;jmp skip_debug - pusha - - mov bx, STR_SPACE - call print_string - - ;show es - target - mov bx,es - - mov al,bh - call print_hex_byte - - mov al,bl - call print_hex_byte - - mov bx, STR_SPACE - call print_string - - ;show next LBA numer - mov ax,[LBA] - mov al,ah - call print_hex_byte - - mov ax,[LBA] - call print_hex_byte - - mov bx, STR_SPACE - call print_string - - popa - - mov ax,[LBA] - - ;calculate chs - call lba_to_chs - - ;show chs sector/ head / cylinder - mov al,cl - call print_hex_byte - - mov al,dh - call print_hex_byte - - mov al,ch - call print_hex_byte - - call print_nextline - - skip_debug: - - - mov ax,[LBA] - - ;calculate chs - call lba_to_chs - - ; and now READ it! - mov al,1 ;number of sectors to read - mov dl,[BOOT_DRIVE] - - mov ah,0x02 ;BIOS read sector func - int 0x13 ;bios interrupt - - jc disk_read_error - - mov bx,es - add bx,0x0020 - cmp bx,0x9000 - je disk_load_finish - - mov es,bx - mov bx,0 - - mov ax,[LBA] - add ax,1 - mov [LBA],ax - - jmp next_sectors_chs - -disk_read_error: - mov bx, STR_ERROR - call print_string - call print_nextline - jmp $ - -disk_load_finish: - - mov bx, STR_PROGRESS - call print_string -; call print_nextline - - popa - ret - - - -;lba to chs translation: -; input : ax - lba -; output: cl - sector -; dh - head -; ch - cylinder / track - -lba_to_chs: - - xor dx, dx ; prepare dx:ax for operation - div WORD [bpbSectorsPerTrack] ; divide by sectors per track - inc dl ; add 1 (obsolute sector formula) - mov cl, dl - - xor dx, dx ; prepare dx:ax for operation - div WORD [bpbHeadsPerCylinder] ; mod by number of heads (Absolue head formula) - mov dh,dl ; everything else was already done from the first formula - - mov ch, al ; not much else to do :) - ret - -;; here we hold the lba addr -lba_adr: - - dw 0x10 ; size of packet ( 16 byte) - dw 64 ; number of sectors to read - - ; target is 0x10000 - - dw 0x0000 ; target addr. offset - -lba_addr_sector: - dw 0x1800 ; target addr. sector - -lba_first_sector: - dw 10 ; first sector to read - dw 0 - - dd 0 - - ; diff --git a/boot/kernel_entry.asm b/boot/kernel_entry.asm deleted file mode 100644 index 53f63ad..0000000 --- a/boot/kernel_entry.asm +++ /dev/null @@ -1,20 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -; this will be compiled to an object file and linked with the kernel -; to simplify the entrance! -; -; -[bits 32] -[extern kernel_main] - -push 0x1 - -cmp eax,1 -je multiproc -push 0x0 -multiproc: - -push esp -call kernel_main ; jumps in the world of C diff --git a/boot/memmap.asm b/boot/memmap.asm deleted file mode 100644 index d101557..0000000 --- a/boot/memmap.asm +++ /dev/null @@ -1,57 +0,0 @@ -;--------------------------------------------- -; Get memory map from bios -; /in es:di->destination buffer for entries -; /ret bp=entry count -;--------------------------------------------- - -; stolen from: http://www.brokenthorn.com/Resources/OSDev17.html -struc MemoryMapEntry - .baseAddress resq 1 ; base address of address range - .length resq 1 ; length of address range in bytes - .type resd 1 ; type of address range - .acpi_null resd 1 ; reserved -endstruc - -[bits 16] - -BiosGetMemoryMap: - pushad - xor ebx, ebx - xor bp, bp ; number of entries stored here - mov edx, 'PAMS' ; 'SMAP' - mov eax, 0xe820 - mov ecx, 24 ; memory map entry struct is 24 bytes - int 0x15 ; get first entry - jc .error - cmp eax, 'PAMS' ; bios returns SMAP in eax - jne .error - test ebx, ebx ; if ebx=0 then list is one entry long; bail out - je .error - jmp .start -.next_entry: - mov edx, 'PAMS' ; some bios's trash this register - mov ecx, 24 ; entry is 24 bytes - mov eax, 0xe820 - int 0x15 ; get next entry -.start: - jcxz .skip_entry ; if actual returned bytes is 0, skip entry -.notext: - mov ecx, [es:di + MemoryMapEntry.length] ; get length (low dword) - test ecx, ecx ; if length is 0 skip it - jne short .good_entry - mov ecx, [es:di + MemoryMapEntry.length + 4]; get length (upper dword) - jecxz .skip_entry ; if length is 0 skip it -.good_entry: - inc bp ; increment entry count - add di, 24 ; point di to next entry in buffer -.skip_entry: - cmp ebx, 0 ; if ebx return is 0, list is done - jne .next_entry ; get next entry - jmp .done -.error: - stc -.done: - - mov [MEMMAP_SIZE_OFFSET],bp - popad - ret diff --git a/boot/mp.asm b/boot/mp.asm deleted file mode 100644 index 072aa74..0000000 --- a/boot/mp.asm +++ /dev/null @@ -1,37 +0,0 @@ -; other processors will enter here! -[org 0x7000] ; here the binary will be loaded - -[bits 16] - - cli ;switch off interrupts! - lgdt [gdt_descriptor] ;load descriptor table! - - ;switch on 32-bit protected mode - mov eax, cr0 - or eax,0x1 - mov cr0, eax - - jmp 0x8:init_pm - -[bits 32] -init_pm: - - mov ax, 0x10 - mov ds, ax - mov ss, ax - mov es, ax - mov fs, ax - mov gs, ax - - mov ebp, 0x95000 - mov esp, ebp - - call boot_32_pm ;continue booting in 32-bit protected mode - -boot_32_pm: - - mov eax,1 -; - call 0x18000 ;jump into our Kernel! - -%include "boot/GDT.asm" diff --git a/boot/pm.asm b/boot/pm.asm deleted file mode 100644 index e6f3474..0000000 --- a/boot/pm.asm +++ /dev/null @@ -1,36 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -; switch_to_pm - actual switch from 16bit real to 32bit protected -; init_pm - sets up some regs and calls boot_32_pm -; - -[bits 16] -switch_to_pm: - - cli ;switch off interrupts! - lgdt [gdt_descriptor] ;load descriptor table! -; lldt [gdt_descriptor] ;load descriptor table! (local) - - ;switch on 32-bit protected mode - mov eax, cr0 - or eax,0x1 - mov cr0, eax - - jmp CODE_SEG:init_pm - -[bits 32] -init_pm: - - mov ax, DATA_SEG - mov ds, ax - mov ss, ax - mov es, ax - mov fs, ax - mov gs, ax - - mov ebp, 0x07bff - mov esp, ebp - - call boot_32_pm ;continue booting in 32-bit protected mode diff --git a/boot/print_string_16.asm b/boot/print_string_16.asm deleted file mode 100644 index 9f81a87..0000000 --- a/boot/print_string_16.asm +++ /dev/null @@ -1,115 +0,0 @@ -[bits 16] - -BLANK: - db 0x12 - -SPACE: - db " ",0 - -;print_string routine ([bx]) -;this routine will print a null terminated string at [bx] to the screen. -print_string: - - pusha ;push all registers - mov ah,0x0e - - print_string_loop: - - ;check if value at [bx] is "\0" (end of string) - mov cl,[bx] - cmp cl,0 - je print_string_finish - - ;otherwise instruct BIOS to print the current char - mov al,cl - int 0x10 - - ;proceed with next char - inc bx - jmp print_string_loop - - print_string_finish: - - popa ;pop all registers - ret ;return to caller - -print_clear: - -pusha - mov ah,0x6 ;func - mov al,0 ;scroll one line - mov bh,[BLANK] ;blank char - - mov ch,0 ;upper left corner - mov cl,0 - mov dh,20 ;lower right corner - mov dl,40 - int 0x10 - - mov ah,0x2 - mov bh,0 - mov dl,0 - mov dh,20 - int 0x10 -popa - -print_nextline: - - pusha - - mov ah,0x6 ;func - mov al,1 ;scroll one line - mov bh,[BLANK] ;blank char - - mov ch,0 ;upper left corner - mov cl,0 - mov dh,20 ;lower right corner - mov dl,40 - int 0x10 - - - mov ah,0x3 - mov bh,0 - int 0x10 - - - mov ah,0x2 - mov dl,0 - int 0x10 - - mov bx,SPACE - call print_string - - popa - ret - - -;print byte from al to screen - print_hex_byte: - - pusha - - mov [.temp],al - shr al,4 - cmp al,10 - sbb al,69h - das - - mov ah,0Eh - int 10h - - mov al,[.temp] - ror al,4 - shr al,4 - cmp al,10 - sbb al,69h - das - - mov ah,0Eh - int 10h - -popa - - ret - - .temp db 0 diff --git a/boot/stage2.asm b/boot/stage2.asm deleted file mode 100644 index 0a3ee87..0000000 --- a/boot/stage2.asm +++ /dev/null @@ -1,247 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -; THE FOOL-BOOT-LOADER -; -; * X sectors of our kernel loaded at KERNEL_OFFSET from floppy -; -; * memory map made available at MEMMAP_OFFSET -; (check at MEMMEP_SIZE_OFFSET for number of entries) -; -; * the VESA mode specified by VESA_MODE_SELECT will be set up -; (check at VESA_MODES, and VESA_MODE_INFO -; for additional information) -; -; * interrupts disabled -; -; * 32-bit protected mode set up. -; -; * esp set under MBR -; -; * A20 gate opened -; -; * and finally we will jump into the C world to kernel_main() ! -; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - - -;we want 16-bit instructions, before we switch to 32-bit protected mode. -[bits 16] - -;define origin of boot record in memory: 0x7c00 was bootloader0 -;this is where the BIOS per definition will put the first -;512 bytes of data from the boot device -;wer are one sector after that. -[org 0x7e00] - -;;define some constants -;;where we will load our kernel into memory and some -;;other memory locations -; -MEMMAP_SIZE_OFFSET equ 0x7c00 -MEMMAP_OFFSET equ 0x7c01 -VESA_MODES equ 0x9300 ; do NOT overwrite yourself! be careful! -VESA_MODE_INFO equ 0x9400 -VESA_MODE_SELECT equ 0x4114 -; - -jmp boot_16 ;start boot process - -;;SOME Global Data, mainly info/error strings -FILL: - times 32 db 0x66 - -BOOT_DRIVE: - db 0xff - -LOADER_TARGET: - dd 0x100000 ;here we will put our image - -KERNEL_CHUNK: - dw 0x1 -STR_VERSION: - db "Fool Loader Stage 2 v0.5",0 - -STR_LOAD: - db "Loading Kernel...",0 -STR_BOOT: - db "Boot Drive: ",0 -MEMMAP_INFO: - db "Getting Memory Map from BIOS.",0 -STR_PM: - db "PROTECTED MODE",0 - -; -;;lets put our temporary GDT (Global Descriptor Table) here -;;kernel should move this away -%include "GDT.asm" -; -;;include 16-bit real mode routines (print_string, disk_load, vesa_setup,check_a20) -%include "disk_load_16.asm" -;%include "boot/check_a20_16.asm" -%include "print_string_16.asm" -%include "vesa_setup_16.asm" -; -;;include our routines for switching to 32-bit protected mode -%include "pm.asm" - -;include some pm mode helpers -%include "common_pm.asm" - -; -; -; -;;get memory map routine -%include "memmap.asm" -; -;;;;;;;;; BOOT 16-bit real ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -;;lets start -[bits 16] - -idt_real: - dw 0x3ff ; 256 entries, 4b each = 1K - dd 0 ; Real Mode IVT @ 0x0000 - -boot_16: - - mov [BOOT_DRIVE],dl - - ;pr info - mov bx, STR_VERSION - call print_string - call print_nextline - - ;show bootdrive - mov bx, STR_BOOT - call print_string - mov al,dl - call print_hex_byte - call print_nextline - - - ; memmap message - mov bx,MEMMAP_INFO - call print_string - call print_nextline - - ;get memory map from bios before we enter 32 bit protected mode - mov ax,0 ; set target address in es:di (0:offset) - mov es,ax - mov di,MEMMAP_OFFSET - call BiosGetMemoryMap ; this will also put the number of entries - ; of the memory map at MEMMAP_SIZE_OFFSET - - ; Load the KERNEL Image - mov bx, STR_LOAD - call print_string - call print_nextline - -kernel_load: - - call disk_load_16 - - ; init vesa on last iteration! - mov ax,[KERNEL_CHUNK] - cmp ax,0x5 - jne skip_vesa_init -; call VesaSetup - skip_vesa_init: - - call switch_to_pm -; -;;;;;;;;; BOOT 32-bit protected mode;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -[bits 32] -boot_32_pm: - - ;Fast A20 Gate: - ;http://wiki.osdev.org/A20_Line - in al, 0x92 - or al, 2 - out 0x92, al - - ; tell the world we are protected - ;mov ebx,STR_PM - ;mov ecx,2*23*80 - ;call print_string_pm - - ;increment chunk number - mov ax,[KERNEL_CHUNK] - add ax,1 - mov [KERNEL_CHUNK],ax - - ;check if all chunkgs loaded (hardcoded to 0x6 for a start) - cmp ax,0x6 - je finish_load - - ; show KERNEL CHUNK value -; push edx ; persist edx for some reason!? -; mov edx,0 -; mov dx,[KERNEL_CHUNK] -; mov ecx,2*24*80 -; call print_hex_pm -; pop edx - - - ; here we actually do copy the chunk into ext mem! - mov eax,[LOADER_TARGET] - mov ebx,0x18000 - - copy_next_byte: - - mov ecx,[ebx] - mov [eax],ecx - - inc eax - inc ebx - cmp ebx, 0x90000 - - jne copy_next_byte - mov [LOADER_TARGET],eax ;persist next target address - - - ; and now go back to real! (first 16bit protected!) - jmp CODE16_SEG:reinit_16 - - finish_load: - ; - - ; call kernel! - mov eax,0 ;tell the kernel - ; we are the booting processor - jmp 0x100000 ;jump into our Kernel! - - -[bits 16] -reinit_16: ;16 bit protected mode - - mov eax,DATA16_SEG - mov ds,eax - mov es,eax - mov fs,eax - mov gs,eax - mov ss,eax - - - mov eax,cr0 - and eax,!0x1 ; Disable protected mode - mov cr0, eax - - jmp 0:realmode - - -realmode: - - mov sp,0x07bff - mov bp,sp - - mov ax,0 - mov ds,ax - mov es,ax - mov fs,ax - mov gs,ax - mov ss,ax - - lidt [idt_real] - - sti - jmp kernel_load diff --git a/boot/vesa_setup_16.asm b/boot/vesa_setup_16.asm deleted file mode 100644 index d4c6ca2..0000000 --- a/boot/vesa_setup_16.asm +++ /dev/null @@ -1,92 +0,0 @@ -VESA_CHECK1: - db "VESA: get modes!",0 -VESA_CHECK2: - db "VESA: get info on target mode!",0 -VESA_CHECK3: - db "VESA: switching to target mode!",0 -VESA_PAUSE: - db "[Press any key to switch to VESA 0x114]",0 - -VesaSetup: - - pusha - - ;VESA: get all available vesa modes! - mov ax,0 ; set target address in es:di (0:offset) - mov es,ax - mov di,VESA_MODES - mov ax,0x4f00 ;vesa function: Get Controller Info - int 0x10 ; call the interrupt to get the data from the bios! - vesa_err: - mov bx, VESA_CHECK1 - call print_string - call print_nextline - cmp ax,0x004f - je vesa_ok - jmp vesa_err - vesa_ok: - ; - - - ;VESA: get vesa info on mode of interest - mov ax,0 ; set target address in es:di (0:offset) - mov es,ax - mov di,VESA_MODE_INFO - mov ax,0x4f01 ;vesa function: Get Mode Info - mov cx,VESA_MODE_SELECT - int 0x10 ; call the interrupt to get the data from the bios! - vesa_err2: - mov bx, VESA_CHECK2 - call print_string - call print_nextline - cmp ax,0x004f - je vesa_ok2 - jmp vesa_err2 - vesa_ok2: - - ;show press any key -; call print_nextline -; mov bx, VESA_PAUSE -; call print_string -; call print_nextline - - ;preempt keyboard buffer - - next_key: - - mov ah,0x1 ;get scnacode from kb (non-blocking) - int 0x16 - jnz get_key ; nothing to preempt - - jmp wait_key - - get_key: - mov ah,0 ;get key from buffer - int 0x16 - -; mov al,ah -; call print_hex_byte -; call print_nextline - - jmp next_key - - ;;;;;;;;;;;;;;;;; - wait_key: -; mov ah,0 ; block waiting for keyboard scancode -; int 0x16 - - - ;VESA: finally switch to the mode of choice! - mov ax,0x4f02 ;vesa function: Set Mode - mov bx,VESA_MODE_SELECT - int 0x10 - cmp ax,0x004f - je vesa_ok3 - vesa_err3: - mov bx, VESA_CHECK3 - call print_string - call print_nextline - jmp vesa_err3 - vesa_ok3: - popa - ret |