mirror of https://github.com/ipxe/ipxe.git
1a602c92ac
When DEBUG=efi_wrap is enabled, we construct a patched copy of the boot services table and patch the global system table to point to this copy. This ensures that any subsequently loaded EFI binaries will call our wrappers. Previously loaded EFI binaries will typically have cached the boot services table pointer (in the gBS variable used by EDK2 code), and therefore will not pick up the updated pointer and so will not call our wrappers. In most cases, this is what we want to happen: we are interested in tracing the calls issued by the newly loaded binary and we do not want to be distracted by the high volume of boot services calls issued by existing UEFI drivers. In some circumstances (such as when a badly behaved OEM driver is causing the system to lock up during the ExitBootServices() call), it can be very useful to be able to patch the global boot services table in situ, so that we can trace calls issued by existing drivers. Restructure the wrapping code to allow wrapping to be enabled or disabled at any time, and to allow for patching the global boot services table in situ. Signed-off-by: Michael Brown <mcb30@ipxe.org> |
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README
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org