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4127 decky 1 
#ifdef CONFIG_FB
4128 decky 2 
 
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#define MULTIBOOT_LOADER_MAGIC  0x2BADB002
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#define MBINFO_BIT_CMDLINE      2
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#define MBINFO_OFFSET_CMDLINE   16
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	# copy real mode VESA initialization code
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4127 decky 9 
	mov $vesa_init, %esi
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	mov $VESA_INIT_SEGMENT << 4, %edi
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	mov $e_vesa_init - vesa_init, %ecx
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	rep movsb
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4128 decky 14 
	# check for GRUB command line
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	mov grub_eax, %eax
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	cmp $MULTIBOOT_LOADER_MAGIC, %eax
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	jne no_cmdline
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	mov grub_ebx, %ebx
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	mov (%ebx), %eax
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	bt $MBINFO_BIT_CMDLINE, %eax
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	jnc no_cmdline
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	# skip the kernel path in command line
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	mov MBINFO_OFFSET_CMDLINE(%ebx), %esi
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	skip_loop:
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		lodsb
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		cmp $0, %al
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		je no_cmdline
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		cmp $' ', %al
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		je skip_loop_done
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		jmp skip_loop
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	skip_loop_done:
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4149 decky 41 
	space_loop:
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		mov (%esi), %al
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		cmp $0, %al
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		je no_cmdline
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		cmp $' ', %al
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		jne space_loop_done
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		inc %esi
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		jmp space_loop
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	space_loop_done:
4128 decky 53 
 
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	# copy at most 23 characters from command line
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4127 decky 56 
	mov $VESA_INIT_SEGMENT << 4, %edi
4128 decky 57 
	add $default_mode - vesa_init, %edi
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	mov $23, %ecx
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	cmd_loop:
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		lodsb
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		stosb
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		cmp $0, %al
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		je cmd_loop_done
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		loop cmd_loop
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	cmd_loop_done:
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	# zero termination
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	xor %eax, %eax
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	stosb
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	no_cmdline:
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	# jump to the real mode
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	mov $VESA_INIT_SEGMENT << 4, %edi
4127 decky 80 
	jmpl *%edi
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	vesa_meeting_point:
4128 decky 83 
		# returned back to protected mode
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4151 decky 85 
		mov %ax, KA2PA(vesa_scanline)
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		shr $16, %eax
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		mov %ax, KA2PA(vesa_bpp)
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		mov %bx, KA2PA(vesa_height)
4127 decky 90 
		shr $16, %ebx
4151 decky 91 
		mov %bx, KA2PA(vesa_width)
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		mov %dl, KA2PA(vesa_green_pos)
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		shr $8, %edx
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		mov %dl, KA2PA(vesa_green_mask)
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		shr $8, %edx
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		mov %dl, KA2PA(vesa_red_pos)
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		shr $8, %edx
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		mov %dl, KA2PA(vesa_red_mask)
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		mov %esi, %edx
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		mov %dl, KA2PA(vesa_blue_pos)
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		shr $8, %edx
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		mov %dl, KA2PA(vesa_blue_mask)
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		mov %edi, KA2PA(vesa_ph_addr)
4127 decky 107 
#endif