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/usr/include/x86_64-linux-gnu/asm/boot.h is in linux-libc-dev 3.2.0-23.36.

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#ifndef _ASM_X86_BOOT_H
#define _ASM_X86_BOOT_H

/* Internal svga startup constants */
#define NORMAL_VGA	0xffff		/* 80x25 mode */
#define EXTENDED_VGA	0xfffe		/* 80x50 mode */
#define ASK_VGA		0xfffd		/* ask for it at bootup */


#endif /* _ASM_X86_BOOT_H */