diff options
Diffstat (limited to 'xxx/boot2')
| -rw-r--r-- | xxx/boot2/GDT.asm | 77 | ||||
| -rw-r--r-- | xxx/boot2/Makefile | 28 | ||||
| -rw-r--r-- | xxx/boot2/check_a20_16.asm | 61 | ||||
| -rw-r--r-- | xxx/boot2/common_pm.asm | 86 | ||||
| -rw-r--r-- | xxx/boot2/disk_load_16.asm | 281 | ||||
| -rw-r--r-- | xxx/boot2/memmap.asm | 57 | ||||
| -rw-r--r-- | xxx/boot2/mp.asm | 37 | ||||
| -rw-r--r-- | xxx/boot2/pm.asm | 36 | ||||
| -rw-r--r-- | xxx/boot2/print_string_16.asm | 115 | ||||
| -rw-r--r-- | xxx/boot2/stage2.asm | 267 | ||||
| -rw-r--r-- | xxx/boot2/vesa_setup_16.asm | 93 |
11 files changed, 1138 insertions, 0 deletions
diff --git a/xxx/boot2/GDT.asm b/xxx/boot2/GDT.asm new file mode 100644 index 0000000..4c14b46 --- /dev/null +++ b/xxx/boot2/GDT.asm @@ -0,0 +1,77 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;;;;;;; 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 +; +; +; +; +global gdt_descriptor + +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 11001111b + 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 10001111b + 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/xxx/boot2/Makefile b/xxx/boot2/Makefile new file mode 100644 index 0000000..f2537ce --- /dev/null +++ b/xxx/boot2/Makefile @@ -0,0 +1,28 @@ +#master boot record + +include ../Makefile.common + +.PHONY: all clean + +STAGE2=stage2.bin +MP=mp.bin +CONFIG=config.inc + + + +ASM_SOURCES=$(wildcard *.asm) + +all: $(STAGE2) $(MP) + +$(CONFIG): ../kernel/config.h + cat ../kernel/config.h | grep "^#define" | sed -e "s/#/%/" -e "s/\/\/.*//" > $@ + +$(STAGE2): $(ASM_SOURCES) $(CONFIG) +$(MP): $(ASM_SOURCES) + +clean: + -rm $(STAGE2) $(MP) $(CONFIG) + + + + diff --git a/xxx/boot2/check_a20_16.asm b/xxx/boot2/check_a20_16.asm new file mode 100644 index 0000000..43da6e3 --- /dev/null +++ b/xxx/boot2/check_a20_16.asm @@ -0,0 +1,61 @@ +; 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/xxx/boot2/common_pm.asm b/xxx/boot2/common_pm.asm new file mode 100644 index 0000000..c96e1a8 --- /dev/null +++ b/xxx/boot2/common_pm.asm @@ -0,0 +1,86 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;;;;;;; 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/xxx/boot2/disk_load_16.asm b/xxx/boot2/disk_load_16.asm new file mode 100644 index 0000000..65b1bff --- /dev/null +++ b/xxx/boot2/disk_load_16.asm @@ -0,0 +1,281 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;;;;;;; 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 + 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/xxx/boot2/memmap.asm b/xxx/boot2/memmap.asm new file mode 100644 index 0000000..d101557 --- /dev/null +++ b/xxx/boot2/memmap.asm @@ -0,0 +1,57 @@ +;--------------------------------------------- +; 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/xxx/boot2/mp.asm b/xxx/boot2/mp.asm new file mode 100644 index 0000000..b6efd04 --- /dev/null +++ b/xxx/boot2/mp.asm @@ -0,0 +1,37 @@ +; 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 "GDT.asm" diff --git a/xxx/boot2/pm.asm b/xxx/boot2/pm.asm new file mode 100644 index 0000000..e6f3474 --- /dev/null +++ b/xxx/boot2/pm.asm @@ -0,0 +1,36 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;;;;;;; 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/xxx/boot2/print_string_16.asm b/xxx/boot2/print_string_16.asm new file mode 100644 index 0000000..9f81a87 --- /dev/null +++ b/xxx/boot2/print_string_16.asm @@ -0,0 +1,115 @@ +[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/xxx/boot2/stage2.asm b/xxx/boot2/stage2.asm new file mode 100644 index 0000000..160d75c --- /dev/null +++ b/xxx/boot2/stage2.asm @@ -0,0 +1,267 @@ +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +; +; 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 0xa000 +MEMMAP_OFFSET equ 0xa001 + +VESA_MODES equ 0xb000 ; do NOT overwrite yourself! be careful! +VESA_MODE_INFO equ 0xc000 + +VESA_MODE_SELECT equ 0x4114 +CHUNKS_TO_LOAD equ 0x20 ;number of 0x8000 * 512 byte chunks to load into ram +; + +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 + +; kernel config +%include "config.inc" + +; +;;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 + + + ; hide text-mode cursor + mov ah,0x01 + mov cx,0x2607 + int 0x10 + + + ;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,(CHUNKS_TO_LOAD-1) + jne skip_vesa_init + + %ifndef FOOLOS_CONSOLE + call VesaSetup + %endif + + 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) + ;each chunk is 0x8000 * 15 bytes + cmp ax,CHUNKS_TO_LOAD + 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,0x07000 + 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/xxx/boot2/vesa_setup_16.asm b/xxx/boot2/vesa_setup_16.asm new file mode 100644 index 0000000..5bee57c --- /dev/null +++ b/xxx/boot2/vesa_setup_16.asm @@ -0,0 +1,93 @@ +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 |