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This patch implements a simple, lightweight form of protection domains using a pluggable framework. Currently, the following plugin is available: - Flat memory model with paging. The overall goal of a protection domain implementation within this framework is to define a set of resources that should be accessible to each protection domain and to prevent that protection domain from accessing other resources. The details of each implementation of protection domains may differ substantially, but they should all be guided by the principle of least privilege. However, that idealized principle is balanced against the practical objectives of limiting the number of relatively time-consuming context switches and minimizing changes to existing code. For additional information, please refer to cpu/x86/mm/README.md. This patch also causes the C compiler to be used as the default linker and assembler.
73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Uefi.h>
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#include <Protocol/LoadedImage.h>
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#define MAX_MEM_DESC 128
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void start(void);
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/* The section attribute below is copied from ATTR_BOOT_CODE in prot-domains.h.
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* prot-domains.h includes stdlib.h which defines NULL. The UEFI headers also
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* define NULL, which induces a warning when the compiler detects the conflict.
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* To avoid that, we avoid including prot-domains.h from this file.
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*/
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EFI_STATUS EFIAPI __attribute__((section(".boot_text")))
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uefi_start(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)
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{
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EFI_MEMORY_DESCRIPTOR mem_map[MAX_MEM_DESC];
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UINTN mem_map_len = sizeof(mem_map);
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UINTN mem_map_key;
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UINTN mem_map_desc_sz;
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UINT32 mem_map_rev;
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EFI_STATUS res;
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res = SystemTable->BootServices->GetMemoryMap(&mem_map_len,
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mem_map,
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&mem_map_key,
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&mem_map_desc_sz,
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&mem_map_rev);
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if(res != EFI_SUCCESS) {
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return EFI_ABORTED;
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}
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res = SystemTable->BootServices->ExitBootServices(ImageHandle, mem_map_key);
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if(res != EFI_SUCCESS) {
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return EFI_ABORTED;
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}
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start();
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/* Should not be reachable: */
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return EFI_SUCCESS;
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}
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