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509 lines
15 KiB
509 lines
15 KiB
/*
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* Copyright (c) 2013-2017, ARM Limited and Contributors. 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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <assert_macros.S>
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.globl get_afflvl_shift
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.globl mpidr_mask_lower_afflvls
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.globl eret
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.globl smc
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.globl zero_normalmem
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.globl zeromem
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.globl zeromem16
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.globl memcpy16
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.globl disable_mmu_el3
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.globl disable_mmu_icache_el3
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#if SUPPORT_VFP
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.globl enable_vfp
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#endif
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func get_afflvl_shift
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cmp x0, #3
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cinc x0, x0, eq
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mov x1, #MPIDR_AFFLVL_SHIFT
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lsl x0, x0, x1
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ret
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endfunc get_afflvl_shift
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func mpidr_mask_lower_afflvls
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cmp x1, #3
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cinc x1, x1, eq
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mov x2, #MPIDR_AFFLVL_SHIFT
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lsl x2, x1, x2
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lsr x0, x0, x2
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lsl x0, x0, x2
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ret
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endfunc mpidr_mask_lower_afflvls
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func eret
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eret
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endfunc eret
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func smc
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smc #0
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endfunc smc
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/* -----------------------------------------------------------------------
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* void zeromem16(void *mem, unsigned int length);
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*
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* Initialise a memory region to 0.
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* The memory address must be 16-byte aligned.
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* NOTE: This function is deprecated and zeromem should be used instead.
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* -----------------------------------------------------------------------
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*/
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.equ zeromem16, zeromem
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/* -----------------------------------------------------------------------
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* void zero_normalmem(void *mem, unsigned int length);
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*
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* Initialise a region in normal memory to 0. This functions complies with the
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* AAPCS and can be called from C code.
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*
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* NOTE: MMU must be enabled when using this function as it can only operate on
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* normal memory. It is intended to be mainly used from C code when MMU
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* is usually enabled.
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* -----------------------------------------------------------------------
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*/
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.equ zero_normalmem, zeromem_dczva
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/* -----------------------------------------------------------------------
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* void zeromem(void *mem, unsigned int length);
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*
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* Initialise a region of device memory to 0. This functions complies with the
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* AAPCS and can be called from C code.
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*
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* NOTE: When data caches and MMU are enabled, zero_normalmem can usually be
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* used instead for faster zeroing.
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*
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* -----------------------------------------------------------------------
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*/
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func zeromem
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/* x2 is the address past the last zeroed address */
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add x2, x0, x1
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/*
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* Uses the fallback path that does not use DC ZVA instruction and
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* therefore does not need enabled MMU
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*/
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b .Lzeromem_dczva_fallback_entry
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endfunc zeromem
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/* -----------------------------------------------------------------------
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* void zeromem_dczva(void *mem, unsigned int length);
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*
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* Fill a region of normal memory of size "length" in bytes with null bytes.
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* MMU must be enabled and the memory be of
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* normal type. This is because this function internally uses the DC ZVA
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* instruction, which generates an Alignment fault if used on any type of
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* Device memory (see section D3.4.9 of the ARMv8 ARM, issue k). When the MMU
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* is disabled, all memory behaves like Device-nGnRnE memory (see section
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* D4.2.8), hence the requirement on the MMU being enabled.
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* NOTE: The code assumes that the block size as defined in DCZID_EL0
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* register is at least 16 bytes.
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*
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* -----------------------------------------------------------------------
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*/
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func zeromem_dczva
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/*
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* The function consists of a series of loops that zero memory one byte
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* at a time, 16 bytes at a time or using the DC ZVA instruction to
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* zero aligned block of bytes, which is assumed to be more than 16.
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* In the case where the DC ZVA instruction cannot be used or if the
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* first 16 bytes loop would overflow, there is fallback path that does
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* not use DC ZVA.
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* Note: The fallback path is also used by the zeromem function that
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* branches to it directly.
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*
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* +---------+ zeromem_dczva
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* | entry |
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* +----+----+
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* |
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* v
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* +---------+
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* | checks |>o-------+ (If any check fails, fallback)
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* +----+----+ |
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* | |---------------+
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* v | Fallback path |
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* +------+------+ |---------------+
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* | 1 byte loop | |
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* +------+------+ .Lzeromem_dczva_initial_1byte_aligned_end
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* | |
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* v |
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* +-------+-------+ |
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* | 16 bytes loop | |
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* +-------+-------+ |
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* | |
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* v |
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* +------+------+ .Lzeromem_dczva_blocksize_aligned
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* | DC ZVA loop | |
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* +------+------+ |
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* +--------+ | |
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* | | | |
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* | v v |
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* | +-------+-------+ .Lzeromem_dczva_final_16bytes_aligned
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* | | 16 bytes loop | |
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* | +-------+-------+ |
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* | | |
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* | v |
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* | +------+------+ .Lzeromem_dczva_final_1byte_aligned
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* | | 1 byte loop | |
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* | +-------------+ |
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* | | |
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* | v |
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* | +---+--+ |
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* | | exit | |
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* | +------+ |
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* | |
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* | +--------------+ +------------------+ zeromem
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* | | +----------------| zeromem function |
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* | | | +------------------+
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* | v v
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* | +-------------+ .Lzeromem_dczva_fallback_entry
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* | | 1 byte loop |
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* | +------+------+
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* | |
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* +-----------+
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*/
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/*
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* Readable names for registers
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*
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* Registers x0, x1 and x2 are also set by zeromem which
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* branches into the fallback path directly, so cursor, length and
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* stop_address should not be retargeted to other registers.
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*/
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cursor .req x0 /* Start address and then current address */
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length .req x1 /* Length in bytes of the region to zero out */
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/* Reusing x1 as length is never used after block_mask is set */
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block_mask .req x1 /* Bitmask of the block size read in DCZID_EL0 */
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stop_address .req x2 /* Address past the last zeroed byte */
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block_size .req x3 /* Size of a block in bytes as read in DCZID_EL0 */
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tmp1 .req x4
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tmp2 .req x5
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#if ASM_ASSERTION
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/*
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* Check for M bit (MMU enabled) of the current SCTLR_EL(1|3)
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* register value and panic if the MMU is disabled.
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*/
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#if defined(IMAGE_BL1) || defined(IMAGE_BL31)
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mrs tmp1, sctlr_el3
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#else
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mrs tmp1, sctlr_el1
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#endif
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tst tmp1, #SCTLR_M_BIT
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ASM_ASSERT(ne)
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#endif /* ASM_ASSERTION */
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/* stop_address is the address past the last to zero */
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add stop_address, cursor, length
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/*
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* Get block_size = (log2(<block size>) >> 2) (see encoding of
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* dczid_el0 reg)
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*/
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mrs block_size, dczid_el0
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/*
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* Select the 4 lowest bits and convert the extracted log2(<block size
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* in words>) to <block size in bytes>
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*/
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ubfx block_size, block_size, #0, #4
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mov tmp2, #(1 << 2)
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lsl block_size, tmp2, block_size
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#if ASM_ASSERTION
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/*
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* Assumes block size is at least 16 bytes to avoid manual realignment
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* of the cursor at the end of the DCZVA loop.
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*/
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cmp block_size, #16
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ASM_ASSERT(hs)
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#endif
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/*
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* Not worth doing all the setup for a region less than a block and
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* protects against zeroing a whole block when the area to zero is
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* smaller than that. Also, as it is assumed that the block size is at
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* least 16 bytes, this also protects the initial aligning loops from
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* trying to zero 16 bytes when length is less than 16.
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*/
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cmp length, block_size
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b.lo .Lzeromem_dczva_fallback_entry
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/*
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* Calculate the bitmask of the block alignment. It will never
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* underflow as the block size is between 4 bytes and 2kB.
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* block_mask = block_size - 1
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*/
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sub block_mask, block_size, #1
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/*
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* length alias should not be used after this point unless it is
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* defined as a register other than block_mask's.
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*/
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.unreq length
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/*
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* If the start address is already aligned to zero block size, go
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* straight to the cache zeroing loop. This is safe because at this
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* point, the length cannot be smaller than a block size.
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*/
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tst cursor, block_mask
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b.eq .Lzeromem_dczva_blocksize_aligned
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/*
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* Calculate the first block-size-aligned address. It is assumed that
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* the zero block size is at least 16 bytes. This address is the last
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* address of this initial loop.
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*/
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orr tmp1, cursor, block_mask
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add tmp1, tmp1, #1
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/*
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* If the addition overflows, skip the cache zeroing loops. This is
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* quite unlikely however.
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*/
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cbz tmp1, .Lzeromem_dczva_fallback_entry
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/*
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* If the first block-size-aligned address is past the last address,
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* fallback to the simpler code.
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*/
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cmp tmp1, stop_address
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b.hi .Lzeromem_dczva_fallback_entry
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/*
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* If the start address is already aligned to 16 bytes, skip this loop.
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* It is safe to do this because tmp1 (the stop address of the initial
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* 16 bytes loop) will never be greater than the final stop address.
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*/
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tst cursor, #0xf
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b.eq .Lzeromem_dczva_initial_1byte_aligned_end
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/* Calculate the next address aligned to 16 bytes */
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orr tmp2, cursor, #0xf
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add tmp2, tmp2, #1
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/* If it overflows, fallback to the simple path (unlikely) */
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cbz tmp2, .Lzeromem_dczva_fallback_entry
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/*
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* Next aligned address cannot be after the stop address because the
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* length cannot be smaller than 16 at this point.
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*/
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/* First loop: zero byte per byte */
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1:
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strb wzr, [cursor], #1
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cmp cursor, tmp2
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b.ne 1b
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.Lzeromem_dczva_initial_1byte_aligned_end:
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/*
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* Second loop: we need to zero 16 bytes at a time from cursor to tmp1
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* before being able to use the code that deals with block-size-aligned
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* addresses.
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*/
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cmp cursor, tmp1
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b.hs 2f
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1:
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stp xzr, xzr, [cursor], #16
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cmp cursor, tmp1
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b.lo 1b
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2:
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/*
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* Third loop: zero a block at a time using DC ZVA cache block zeroing
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* instruction.
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*/
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.Lzeromem_dczva_blocksize_aligned:
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/*
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* Calculate the last block-size-aligned address. If the result equals
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* to the start address, the loop will exit immediately.
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*/
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bic tmp1, stop_address, block_mask
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cmp cursor, tmp1
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b.hs 2f
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1:
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/* Zero the block containing the cursor */
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dc zva, cursor
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/* Increment the cursor by the size of a block */
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add cursor, cursor, block_size
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cmp cursor, tmp1
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b.lo 1b
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2:
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/*
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* Fourth loop: zero 16 bytes at a time and then byte per byte the
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* remaining area
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*/
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.Lzeromem_dczva_final_16bytes_aligned:
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/*
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* Calculate the last 16 bytes aligned address. It is assumed that the
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* block size will never be smaller than 16 bytes so that the current
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* cursor is aligned to at least 16 bytes boundary.
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*/
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bic tmp1, stop_address, #15
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cmp cursor, tmp1
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b.hs 2f
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1:
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stp xzr, xzr, [cursor], #16
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cmp cursor, tmp1
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b.lo 1b
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2:
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/* Fifth and final loop: zero byte per byte */
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.Lzeromem_dczva_final_1byte_aligned:
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cmp cursor, stop_address
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b.eq 2f
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1:
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strb wzr, [cursor], #1
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cmp cursor, stop_address
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b.ne 1b
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2:
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ret
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/* Fallback for unaligned start addresses */
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.Lzeromem_dczva_fallback_entry:
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/*
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* If the start address is already aligned to 16 bytes, skip this loop.
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*/
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tst cursor, #0xf
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b.eq .Lzeromem_dczva_final_16bytes_aligned
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/* Calculate the next address aligned to 16 bytes */
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orr tmp1, cursor, #15
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add tmp1, tmp1, #1
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/* If it overflows, fallback to byte per byte zeroing */
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cbz tmp1, .Lzeromem_dczva_final_1byte_aligned
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/* If the next aligned address is after the stop address, fall back */
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cmp tmp1, stop_address
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b.hs .Lzeromem_dczva_final_1byte_aligned
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/* Fallback entry loop: zero byte per byte */
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1:
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strb wzr, [cursor], #1
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cmp cursor, tmp1
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b.ne 1b
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b .Lzeromem_dczva_final_16bytes_aligned
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.unreq cursor
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/*
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* length is already unreq'ed to reuse the register for another
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* variable.
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*/
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.unreq stop_address
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.unreq block_size
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.unreq block_mask
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.unreq tmp1
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.unreq tmp2
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endfunc zeromem_dczva
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/* --------------------------------------------------------------------------
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* void memcpy16(void *dest, const void *src, unsigned int length)
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*
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* Copy length bytes from memory area src to memory area dest.
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* The memory areas should not overlap.
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* Destination and source addresses must be 16-byte aligned.
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* --------------------------------------------------------------------------
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*/
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func memcpy16
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#if ASM_ASSERTION
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orr x3, x0, x1
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tst x3, #0xf
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ASM_ASSERT(eq)
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#endif
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/* copy 16 bytes at a time */
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m_loop16:
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cmp x2, #16
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b.lo m_loop1
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ldp x3, x4, [x1], #16
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stp x3, x4, [x0], #16
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sub x2, x2, #16
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b m_loop16
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/* copy byte per byte */
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m_loop1:
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cbz x2, m_end
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ldrb w3, [x1], #1
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strb w3, [x0], #1
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subs x2, x2, #1
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b.ne m_loop1
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m_end:
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ret
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endfunc memcpy16
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/* ---------------------------------------------------------------------------
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* Disable the MMU at EL3
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* ---------------------------------------------------------------------------
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*/
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func disable_mmu_el3
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mov x1, #(SCTLR_M_BIT | SCTLR_C_BIT)
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do_disable_mmu:
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mrs x0, sctlr_el3
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bic x0, x0, x1
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msr sctlr_el3, x0
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isb // ensure MMU is off
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dsb sy
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ret
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endfunc disable_mmu_el3
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func disable_mmu_icache_el3
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mov x1, #(SCTLR_M_BIT | SCTLR_C_BIT | SCTLR_I_BIT)
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b do_disable_mmu
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endfunc disable_mmu_icache_el3
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/* ---------------------------------------------------------------------------
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* Enable the use of VFP at EL3
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* ---------------------------------------------------------------------------
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*/
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#if SUPPORT_VFP
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func enable_vfp
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mrs x0, cpacr_el1
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orr x0, x0, #CPACR_VFP_BITS
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msr cpacr_el1, x0
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mrs x0, cptr_el3
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mov x1, #AARCH64_CPTR_TFP
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bic x0, x0, x1
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msr cptr_el3, x0
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isb
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ret
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endfunc enable_vfp
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#endif
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