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x86, realmode: Relocator for realmode code

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Implements relocator for real mode code that is called
as part of setup_arch(). Processes segment relocations
and linear relocations. Real-mode code is relocated to
a free hole below 1 MB.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-4-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jarkko Sakkinen
2012-05-08 21:22:26 +03:00
committed by H. Peter Anvin
parent b3266bd6ff
commit 084ee1c641
4 changed files with 108 additions and 0 deletions
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26
arch/x86/include/asm/realmode.h Normal file
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#ifndef _ARCH_X86_REALMODE_H
#define _ARCH_X86_REALMODE_H
#include <linux/types.h>
#include <asm/io.h>
/* This must match data at realmode.S */
struct real_mode_header {
u32 text_start;
u32 ro_end;
u32 end;
} __attribute__((__packed__));
extern struct real_mode_header real_mode_header;
extern unsigned char *real_mode_base;
extern unsigned long init_rsp;
extern unsigned long initial_code;
extern unsigned long initial_gs;
extern unsigned char real_mode_blob[];
extern unsigned char real_mode_relocs[];
extern void __init setup_real_mode(void);
#endif /* _ARCH_X86_REALMODE_H */