/*
* Copyright (c) 2022 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
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* The Original Code and all software distributed under the License are
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*/
#include <machine/asm.h>
#include <mach/kern_return.h>
#include <arm64/proc_reg.h>
#include <arm64/exception_asm.h>
#include <pexpert/arm64/board_config.h>
#include "assym.s"
#if HAS_GUARDED_IO_FILTER && !CONFIG_SPTM
.section __PPLTEXT,__text,regular,pure_instructions
.align 2
.globl EXT(io_filter_vtop)
LEXT(io_filter_vtop)
ARM64_STACK_PROLOG
/* x9 - temp reg for the physical addr of the ioreg, x10 - draft reg. */
at s1e1w, x0 // Get PA of the addr passed in for comparison.
// Use s1e1w flavor of at so permission is checked for writing from EL1.
isb sy
mrs x9, PAR_EL1
and x10, x9, #0x7ffffffffc000 // Extract the page-aligned address from PAR_EL1.PA[51:48] | PAR_EL1.PA[47:14].
bfxil x10, x0, #0, #14 // Copy the page offset from the VA to assemble the PA.
tst x9, #0x1 // Check PAR_EL1.F to see if translation was successful.
csel x0, x10, xzr, eq // If translation was successful return PA, else 0.
ARM64_STACK_EPILOG
#endif /* HAS_GUARDED_IO_FILTER && !CONFIG_SPTM */