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Rev 2713 Rev 2725
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
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	je valid_boot
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	je valid_boot
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		xorl %ecx, %ecx					# no memory size or map available
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		xorl %ecx, %ecx					# no memory size or map available
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		movl %ecx, e801memorysize
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		movl %ecx, e820counter
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		movl %ecx, e820counter
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		jmp invalid_boot
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		jmp invalid_boot
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	valid_boot:
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	valid_boot:
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		movl (%ebx), %eax				# ebx = physical address of struct multiboot_info
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		movl (%ebx), %eax				# ebx = physical address of struct multiboot_info
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		bt $0, %eax					# mbi->flags[0] (mem_lower, mem_upper valid)
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		jc mem_valid
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			xorl %ecx, %ecx
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			jmp mem_invalid
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- 
 
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		mem_valid:
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		movl 4(%ebx), %ecx				# mbi->mem_lower
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		addl 8(%ebx), %ecx				# mbi->mem_upper
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- 
 
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		mem_invalid:
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		movl %ecx, e801memorysize
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		bt $3, %eax					# mbi->flags[3] (mods_count, mods_addr valid)
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		bt $3, %eax					# mbi->flags[3] (mods_count, mods_addr valid)
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		jc mods_valid
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		jc mods_valid
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			xorq %rcx, %rcx
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			xorq %rcx, %rcx
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			movq %rcx, init
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			movq %rcx, init