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112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/* $Id: //depot/dev/Foxhill/Xtensa/OS/include/xtensa/mpuasm.h#5 $ */
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/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _MPUASM_H_
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#define _MPUASM_H_
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#include <xtensa/config/core.h>
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/*
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* Macro for writing MPU map.
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*
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* Parameters:
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* a_map => address register containing pointer to MPU map
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* a_num_entries => number of entries in the forementioned map
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* a_temp1, a_temp2. => address register temporaries
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* a_temp3, a_temp4
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*/
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.macro mpu_write_map a_map, a_num_entries, a_temp1, a_temp2, a_temp3, a_temp4
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#if XCHAL_HAVE_MPU
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movi \a_temp1, 0
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wsr.cacheadrdis \a_temp1 // enable the cache in all regions
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wsr.mpuenb \a_temp1 // disable all foreground entries
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// Clear out the unused entries.
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//
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// Currently we are clearing out all the entries because currently
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// the entries must be ordered even if they are all disabled.
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// If out of order entries were permitted when all are disabled,
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// performance could be improved by clearing XCHAL_MPU_ENTRIES - n
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// (n = number of entries) rather than XCHAL_MPU_ENTRIES - 1 entries.
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//
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movi \a_temp2, 0
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movi \a_temp3, XCHAL_MPU_ENTRIES - 1
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j 1f
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.align 16 // this alignment is done to ensure that
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1:
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memw // todo currently wptlb must be preceeded by a memw. The instructions must
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// be aligned to ensure that both are in the same cache line. These statements should be
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// properly conditionalized when that restriction is removed from the HW
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wptlb \a_temp2, \a_temp1
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addi \a_temp2, \a_temp2, 1
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bltu \a_temp2, \a_temp3, 1b
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// Write the new entries.
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//
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beqz \a_num_entries, 4f // if no entries, skip loop
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addx8 \a_map, \a_num_entries, \a_map // compute end of provided map
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j 3f
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.align 16
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2: memw // todo currently wptlb must be preceeded by a memw. The instructions must
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// be aligned to ensure that both are in the same cache line. These statements should be
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// properly conditionalized when that restriction is removed from the HW
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wptlb \a_temp2, \a_temp4
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addi \a_temp3, \a_temp3, -1
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beqz \a_num_entries, 4f // loop until done
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3: addi \a_map, \a_map, -8
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l32i \a_temp2, \a_map, 4 // get at (acc.rights, memtype)
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l32i \a_temp4, \a_map, 0 // get as (vstart, valid)
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addi \a_num_entries, \a_num_entries, -1
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extui \a_temp1, \a_temp2, 0, 5 // entry index portion
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xor \a_temp2, \a_temp2, \a_temp1 // zero it
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or \a_temp2, \a_temp2, \a_temp3 // set index = \a_temp3
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j 2b
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4:
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#endif
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.endm
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/*
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* Macro for reading MPU map
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*
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* Parameters:
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* a_map_ptr => address register pointing to memory where map is written
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* a_temp1, a_temp2 => address register temporaries
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*/
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.macro mpu_read_map a_map_ptr, a_temp1, a_temp2
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#if XCHAL_HAVE_MPU
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movi \a_temp1, XCHAL_MPU_ENTRIES // set index to last entry + 1
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addx8 \a_map_ptr, \a_temp1, \a_map_ptr // set map ptr to last entry + 1
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1: addi \a_temp1, \a_temp1, -1 // decrement index
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addi \a_map_ptr, \a_map_ptr, -8 // decrement index
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rptlb0 \a_temp2, \a_temp1 // read 1/2 of entry
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s32i \a_temp2, \a_map_ptr, 0 // write 1/2 of entry
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rptlb1 \a_temp2, \a_temp1
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s32i \a_temp2, \a_map_ptr, 4
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bnez \a_temp1, 1b // loop until done
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#endif
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.endm
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#endif
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