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115 lines
4.4 KiB
C
115 lines
4.4 KiB
C
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/*
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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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#ifndef CPU_X86_MM_PAGING_PROT_DOMAINS_H_
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#define CPU_X86_MM_PAGING_PROT_DOMAINS_H_
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "dma.h"
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#include "helpers.h"
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#include "paging.h"
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#include "syscalls-int.h"
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struct dom_kern_data {
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/** Base physical address of optional MMIO region */
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uintptr_t mmio;
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/** Number of (contiguous) pages in MMIO region */
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size_t mmio_sz;
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/** Base physical address of optional metadata region */
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uintptr_t meta;
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/** Number of (contiguous) pages in metadata region */
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size_t meta_sz;
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/** Flags are defined with the prefix PROT_DOMAINS_FLAG in prot-domains.h */
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uint32_t flags;
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/**
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* Original return address from call stack when this protection domain
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* invoked some other protection domain. This serves to control the return
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* entrypoint. The callee is not permitted to modify this value (unless the
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* callee is the kernel protection domain).
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*/
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uintptr_t orig_ret_addr;
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/* align to next-larger power of 2 to enable usage of shifting instead of
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* multiplication to index an array of these structures.
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*/
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} __attribute__((aligned(32)));
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/** Linear base address at which to map the MMIO region. */
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#define PROT_DOMAINS_MMIO_LINEAR_BASE (MIN_PAGE_SIZE + (uintptr_t)&_ebss_kern_addr)
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/** Maximum supported size of MMIO region */
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#define PROT_DOMAINS_MAX_MMIO_SZ 0x4000
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/** Linear base address at which to map the metadata region */
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#define PROT_DOMAINS_META_LINEAR_BASE \
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(MIN_PAGE_SIZE + (PROT_DOMAINS_MMIO_LINEAR_BASE + PROT_DOMAINS_MAX_MMIO_SZ))
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#define PROT_DOMAINS_META_OFF_TO_PHYS(off, meta_phys_base) \
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((meta_phys_base) + ((off) - PROT_DOMAINS_META_LINEAR_BASE))
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/** Any MMIO region mapping always starts at a particular linear address. */
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#define PROT_DOMAINS_MMIO(dcd) PROT_DOMAINS_MMIO_LINEAR_BASE
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/**
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* Any metadata region mapping always starts at a particular linear address.
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*/
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#define PROT_DOMAINS_META(dcd) PROT_DOMAINS_META_LINEAR_BASE
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#define PROT_DOMAINS_ENTER_ISR(exc) \
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PROT_DOMAINS_ENTER_ISR_COMMON(exc)
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#define PROT_DOMAINS_LEAVE_ISR(exc) PROT_DOMAINS_LEAVE_ISR_COMMON(exc)
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/* Enable paging */
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#define CR0_PG BIT(31)
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/* Enable write protection in supervisor mode */
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#define CR0_WP BIT(16)
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/* Enable protected mode */
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#define CR0_PE BIT(0)
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/**
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* \brief Enable or disable write protection enforcement in supervisor mode.
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* When disabled, supervisory code (i.e. code running at ring levels
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* 0-2) is permitted to write to pages that are marked read-only in
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* page tables.
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*
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* \param en Set to true to enable write protection enforcement.
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*/
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static inline void prot_domains_set_wp(bool en)
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{
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uint32_t cr0_val = CR0_PG | CR0_PE;
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if(en) {
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cr0_val |= CR0_WP;
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}
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__asm__ __volatile__ ("mov %0, %%cr0" :: "r"(cr0_val));
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}
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#endif /* CPU_X86_MM_PAGING_PROT_DOMAINS_H_ */
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