[comboot] Add COMBOOT and COM32 support

src/tests/comboot/shuffle-simple.asm

@@ -0,0 +1,40 @@
+	bits 16
+	org 100h
+
+	jmp start
+	
+shuffle_start:
+	push 0xB800
+	pop es
+	mov cx, 80*24*2
+	mov ax, 'AA'
+	xor di, di
+	rep stosw
+.lbl:	jmp .lbl
+shuffle_end:
+	nop
+shuffle_len equ (shuffle_end - shuffle_start + 1)
+
+start:
+	; calculate physical address of shuffled part
+	xor eax, eax
+	push ds
+	pop ax
+	shl eax, 4
+	add ax, shuffle_start
+	mov dword [source], eax
+
+	mov ax, 0012h
+	mov di, shuffle_descriptors
+	mov cx, num_shuffle_descriptors
+	mov ebp, 0x7c00
+	int 22h
+	int3
+
+shuffle_descriptors:
+	dd 0x7C00
+source:	dd 0
+	dd shuffle_len
+
+num_shuffle_descriptors equ 1
+

src/tests/comboot/version.asm

@@ -0,0 +1,136 @@
+	bits 16
+	org 100h
+
+_start:
+	; first check for SYSLINUX
+	mov ah, 30h
+	int 21h
+
+	cmp eax, 59530000h
+	jne .not_syslinux
+	cmp ebx, 4c530000h
+	jne .not_syslinux
+	cmp ecx, 4e490000h
+	jne .not_syslinux
+	cmp edx, 58550000h
+	jne .not_syslinux
+
+	; now get syslinux version
+	mov ax, 0001h
+	int 22h
+
+	push cx
+	push dx
+	push di
+	push si
+	push es
+
+	; print version string
+	mov dx, str_version
+	mov ah, 09h
+	int 21h
+
+	pop es
+	pop bx
+	push es
+	mov ax, 0002h
+	int 22h
+
+	; print copyright string
+	mov dx, str_copyright
+	mov ah, 09h
+	int 21h
+
+	pop es
+	pop bx
+	mov ax, 0002h
+	int 22h
+
+	; print syslinux derivative id
+	mov dx, str_derivative
+	mov ah, 09h
+	int 21h
+
+	pop ax
+	call print_hex_byte
+
+	; print version number
+	mov dx, str_version_num
+	mov ah, 09h
+	int 21h
+
+	pop cx
+	push cx
+	mov ax, cx
+	and ax, 0FFh
+	call print_dec_word
+
+	mov dl, '.'
+	mov ah, 02h
+	int 21h
+
+	pop cx
+	mov ax, cx
+	shr ax, 8
+	call print_dec_word
+
+	ret
+
+
+.not_syslinux:
+	mov dx, str_not_syslinux
+	mov ah, 09h
+	int 21h
+	ret
+
+; input: al = byte to print in hex
+print_hex_byte:
+	push ax
+	shr al, 4
+	call print_hex_nybble
+	pop ax
+	call print_hex_nybble
+	ret
+
+; input: bottom half of al = nybble to print in hex
+print_hex_nybble:
+	push ax
+	mov bl, al
+	and bx, 1111b
+	mov dl, [str_hex + bx]
+	mov ah, 02h
+	int 21h
+	pop ax
+	ret
+
+str_hex: db "01234567890abcdef"
+
+; input: ax = word to print
+print_dec_word:
+	mov cx, 10
+	mov word [.count], 0
+.loop:
+	xor dx, dx
+	div cx
+	inc word [.count]
+	push dx
+	test ax, ax
+	jnz .loop
+
+.print:
+	pop dx
+	add dx, '0'
+	mov ah, 02h
+	int 21h
+	dec word [.count]
+	jnz .print
+
+	ret
+
+.count:	dw 0
+
+str_not_syslinux: db "Not SYSLINUX or derivative (running on DOS?)$"
+str_version: db "Version: $"
+str_copyright: db 10, "Copyright: $"
+str_derivative: db 10, "Derivative ID: 0x$"
+str_version_num: db 10, "Version number: $"