Differential D26976 Diff 79613 sys/arm64/vmm/hyp.h

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sys/arm64/vmm/hyp.h

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				/*
				* Copyright (C) 2017 Alexandru Elisei <alexandru.elisei@gmail.com>
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#ifndef _VMM_HYP_H_
				#define _VMM_HYP_H_

				/*
				* The translation tables for the hypervisor mode will hold mappings for kernel
				* virtual addresses and an identity mapping (VA == PA) necessary when
				* enabling/disabling the MMU.
				*
				* When in EL2 exception level the translation table base register is TTBR0_EL2
				* and the virtual addresses generated by the CPU must be at the bottom of the
				* memory, with the first 16 bits all set to zero:
				*
				* 0x0000ffffffffffff End hyp address space
				* 0x0000000000000000 Start of hyp address space
				*
				* To run code in hyp mode we need to convert kernel virtual addresses to
				* addreses that fit into this address space.
				*
				* The kernel virtual address range is:
				*
				* 0xffff007fffffffff End of KVA
				* 0xffff000000000000 Kernel base address & start of KVA
				*
				* (see /sys/arm64/include/vmparam.h).
				*
				* We could convert the kernel virtual addresses to valid EL2 addresses by
				* setting the first 16 bits to zero and thus mapping the kernel addresses in
				* the bottom half of the EL2 address space, but then they might clash with the
				* identity mapping addresses. Instead we map the kernel addresses in the upper
				* half of the EL2 address space.
				*
				* The hypervisor address space will look like this:
				*
				* 0x0000807fffffffff End of KVA mapping
				* 0x0000800000000000 Start of KVA mapping
				*
				* 0x00007fffffffffff End of identity mapping
				* 0x0000000000000000 Start of identity mapping
				*
				* With the scheme we have 47 bits at our disposable for the identity map and
				* another 47 bits for the kernel virtual addresses. For a maximum physical
				* memory size of 128TB we are guaranteed to not have any clashes between
				* addresses.
				*/
				#define HYP_VM_MIN_ADDRESS 0x0000000000000000
				#define HYP_VM_MAX_ADDRESS 0x0000ffffffffffff

				#define HYP_KVA_OFFSET 0x0000800000000000
				#define HYP_KVA_MASK 0x0000ffffffffffff

				/*
				* When taking asynchronous exceptions, or interrupts, with the exception of the
				* SError interrupt, the exception syndrome register is not updated with the
				* exception code. We need to differentiate between the different exception
				* types taken to EL2.
				*/
				#define EXCP_TYPE_EL1_SYNC 0
				#define EXCP_TYPE_EL1_IRQ 1
				#define EXCP_TYPE_EL1_FIQ 2
				#define EXCP_TYPE_EL1_ERROR 3

				#define EXCP_TYPE_EL2_SYNC 4
				#define EXCP_TYPE_EL2_IRQ 5
				#define EXCP_TYPE_EL2_FIQ 6
				#define EXCP_TYPE_EL2_ERROR 7

				#define EXCP_TYPE_MAINT_IRQ 8

				#define HYP_GET_VECTOR_TABLE -1

				#endif /* !_VMM_HYP_H_ */