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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (C) 2017 Alexandru Elisei <alexandru.elisei@gmail.com>
*
* 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 0x0001000000000000
/*
* When the vmm code is installed the following handles can be used by
* the host to call into EL2.
*/
#define HYP_CLEANUP 0x00000001
#define HYP_ENTER_GUEST 0x00000002
#define HYP_READ_REGISTER 0x00000003
#define HYP_REG_ICH_VTR 0x1
#define HYP_CLEAN_S2_TLBI 0x00000004
#define HYP_DC_CIVAC 0x00000005
#define HYP_EL2_TLBI 0x00000006
#define HYP_EL2_TLBI_ALL 0x1
#define HYP_EL2_TLBI_VA 0x2
#define HYP_S2_TLBI_RANGE 0x00000010
#define HYP_S2_TLBI_ALL 0x00000011
/*
* 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
/* Used internally in vmm_hyp.c */
#define EXCP_TYPE_REENTER 9
#define HYP_GET_VECTOR_TABLE -1
#endif /* !_VMM_HYP_H_ */
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