diff options
Diffstat (limited to 'src/arch/i386/interface/pxe/pxe_file.c')
| -rw-r--r-- | src/arch/i386/interface/pxe/pxe_file.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/arch/i386/interface/pxe/pxe_file.c b/src/arch/i386/interface/pxe/pxe_file.c index 552a1a12..8d832123 100644 --- a/src/arch/i386/interface/pxe/pxe_file.c +++ b/src/arch/i386/interface/pxe/pxe_file.c @@ -12,9 +12,12 @@ #include <gpxe/posix_io.h> #include <gpxe/features.h> #include <pxe.h> +#include <realmode.h> /* * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>. + * Portions (C) 2010 Shao Miller <shao.miller@yrdsb.edu.on.ca>. + * [PXE exit hook logic] * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -230,6 +233,9 @@ PXENV_EXIT_t pxenv_file_exec ( struct s_PXENV_FILE_EXEC *file_exec ) { return PXENV_EXIT_SUCCESS; } +segoff_t __data16 ( pxe_exit_hook ) = { 0, 0 }; +#define pxe_exit_hook __use_data16 ( pxe_exit_hook ) + /** * FILE API CHECK * @@ -260,7 +266,41 @@ PXENV_EXIT_t pxenv_file_api_check ( struct s_PXENV_FILE_API_CHECK *file_api_chec file_api_check->Magic = 0xe9c17b20; file_api_check->Provider = 0x45585067; /* "gPXE" */ file_api_check->APIMask = 0x0000007f; /* Functions e0-e6 */ + /* Check to see if we have a PXE exit hook */ + if ( pxe_exit_hook.segment | pxe_exit_hook.offset ) + /* Function e7, also */ + file_api_check->APIMask |= 0x00000080; file_api_check->Flags = 0; /* None defined */ return PXENV_EXIT_SUCCESS; } } + +/** + * FILE EXIT HOOK + * + * @v file_exit_hook Pointer to a struct + * s_PXENV_FILE_EXIT_HOOK + * @v s_PXENV_FILE_EXIT_HOOK::Hook SEG16:OFF16 to jump to + * @ret #PXENV_EXIT_SUCCESS Successfully set hook + * @ret #PXENV_EXIT_FAILURE We're not an NBP build + * @ret s_PXENV_FILE_EXIT_HOOK::Status PXE status code + * + */ +PXENV_EXIT_t pxenv_file_exit_hook ( struct s_PXENV_FILE_EXIT_HOOK + *file_exit_hook ) { + DBG ( "PXENV_FILE_EXIT_HOOK" ); + + /* Check to see if we have a PXE exit hook */ + if ( pxe_exit_hook.segment | pxe_exit_hook.offset ) { + /* We'll jump to the specified SEG16:OFF16 during exit */ + pxe_exit_hook.segment = file_exit_hook->Hook.segment; + pxe_exit_hook.offset = file_exit_hook->Hook.offset; + file_exit_hook->Status = PXENV_STATUS_SUCCESS; + return PXENV_EXIT_SUCCESS; + } + + DBG ( " not NBP" ); + file_exit_hook->Status = PXENV_STATUS_UNSUPPORTED; + return PXENV_EXIT_FAILURE; +} + |