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Rev 2302 Rev 2725
Line 107... Line 107...
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	movl grub_eax, %eax
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	movl grub_eax, %eax
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	movl grub_ebx, %ebx
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	movl grub_ebx, %ebx
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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 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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- 
 
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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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- 
 
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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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			xorl %ecx, %ecx
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			xorl %ecx, %ecx
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			movl %ecx, init
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			movl %ecx, init