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/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT HOLDER 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 __XLAT_TABLES_ARCH_H__
#define __XLAT_TABLES_ARCH_H__
#include <arch.h>
#include <platform_def.h>
#include <xlat_tables_defs.h>
/*
* In AArch64 state, the MMU may support 4 KB, 16 KB and 64 KB page
* granularity. For 4KB granularity, a level 0 table descriptor doesn't support
* block translation. For 16KB, the same thing happens to levels 0 and 1. For
* 64KB, same for level 1. See section D4.3.1 of the ARMv8-A Architecture
* Reference Manual (DDI 0487A.k) for more information.
*
* The define below specifies the first table level that allows block
* descriptors.
*/
#if PAGE_SIZE == (4*1024) /* 4KB */
# define MIN_LVL_BLOCK_DESC 1
#else /* 16KB or 64KB */
# define MIN_LVL_BLOCK_DESC 2
#endif
/*
* Each platform can define the size of the virtual address space, which is
* defined in PLAT_VIRT_ADDR_SPACE_SIZE. TCR.TxSZ is calculated as 64 minus the
* width of said address space. The value of TCR.TxSZ must be in the range 16
* to 39 [1], which means that the virtual address space width must be in the
* range 48 to 25 bits.
*
* Here we calculate the initial lookup level from the value of
* PLAT_VIRT_ADDR_SPACE_SIZE. For a 4 KB page size, level 0 supports virtual
* address spaces of widths 48 to 40 bits, level 1 from 39 to 31, and level 2
* from 30 to 25. Wider or narrower address spaces are not supported. As a
* result, level 3 cannot be used as initial lookup level with 4 KB
* granularity. [2]
*
* For example, for a 35-bit address space (i.e. PLAT_VIRT_ADDR_SPACE_SIZE ==
* 1 << 35), TCR.TxSZ will be programmed to (64 - 35) = 29. According to Table
* D4-11 in the ARM ARM, the initial lookup level for an address space like
* that is 1.
*
* See the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more
* information:
* [1] Page 1730: 'Input address size', 'For all translation stages'.
* [2] Section D4.2.5
*/
#if PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << (64 - TCR_TxSZ_MIN))
# error "PLAT_VIRT_ADDR_SPACE_SIZE is too big."
#elif PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << L0_XLAT_ADDRESS_SHIFT)
# define XLAT_TABLE_LEVEL_BASE 0
# define NUM_BASE_LEVEL_ENTRIES \
(PLAT_VIRT_ADDR_SPACE_SIZE >> L0_XLAT_ADDRESS_SHIFT)
#elif PLAT_VIRT_ADDR_SPACE_SIZE > (1 << L1_XLAT_ADDRESS_SHIFT)
# define XLAT_TABLE_LEVEL_BASE 1
# define NUM_BASE_LEVEL_ENTRIES \
(PLAT_VIRT_ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT)
#elif PLAT_VIRT_ADDR_SPACE_SIZE >= (1 << (64 - TCR_TxSZ_MAX))
# define XLAT_TABLE_LEVEL_BASE 2
# define NUM_BASE_LEVEL_ENTRIES \
(PLAT_VIRT_ADDR_SPACE_SIZE >> L2_XLAT_ADDRESS_SHIFT)
#else
# error "PLAT_VIRT_ADDR_SPACE_SIZE is too small."
#endif
#endif /* __XLAT_TABLES_ARCH_H__ */
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