deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

x86: Add support for (paging-based) protection domains

Browse source 
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.
This commit is contained in:
Michael LeMay 2015-08-10 08:34:02 -07:00
parent b0de416682
commit 3908253038
48 changed files with 3558 additions and 295 deletions
Download patch file Download diff file Expand all files Collapse all files

30
cpu/x86/init/common/gdt.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -31,6 +31,32 @@
#ifndef GDT_H
#define GDT_H
void gdt_init(void);
#include "gdt-layout.h"
#include "prot-domains.h"
#include "segmentation.h"
extern segment_desc_t gdt[];
extern int _ebss_gdt_addr;
#define GDT_IDX_OF_DESC(ptr) \
((((uintptr_t)(ptr)) - ((uintptr_t)&gdt))/ \
sizeof(segment_desc_t))
/**
* \brief Compute the selector for a GDT entry allocated somewhere besides gdt.c.
* \param ptr Pointer to GDT descriptor.
* \param rpl Requested Privilege Level.
*/
#define GDT_SEL_OF_DESC(ptr, rpl) GDT_SEL(GDT_IDX_OF_DESC(ptr), rpl)
#define ATTR_BSS_GDT __attribute__((section(".gdt_bss")))
#define ATTR_BSS_GDT_START __attribute__((section(".gdt_bss_start")))
void gdt_copy_desc_change_dpl(unsigned int dest_idx,
unsigned int src_idx,
unsigned dpl);
void gdt_init(void) ATTR_CODE_BOOT;
void gdt_insert(unsigned int idx, segment_desc_t desc);
void gdt_lookup(unsigned int idx, segment_desc_t *desc);
#endif /* GDT_H */