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[efi] Allow DEBUG=efi_wrap to be used independently of a loaded image

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Allow temporary debugging code to call efi_wrap_systab() to obtain a
pointer to the wrapper EFI system table.  This can then be used to
e.g. forcibly overwrite the boot services table pointer used by an
already loaded and running UEFI driver, in order to trace calls made
by that driver.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-10-01 15:44:05 +01:00
parent 8344803c93
commit 7151fa3ffa
2 changed files with 35 additions and 25 deletions
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src/include/ipxe/efi/efi_wrap.h
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@@ -10,6 +10,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/efi/efi.h>
extern EFI_SYSTEM_TABLE * efi_wrap_systab ( void );
extern void efi_wrap ( EFI_HANDLE handle );
#endif /* _IPXE_EFI_WRAP_H */