1*42e22086SApple OSS Distributions/* 2*42e22086SApple OSS Distributions * Copyright (c) 2022 Apple Inc. All rights reserved. 3*42e22086SApple OSS Distributions * 4*42e22086SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*42e22086SApple OSS Distributions * 6*42e22086SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*42e22086SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*42e22086SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*42e22086SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*42e22086SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*42e22086SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*42e22086SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*42e22086SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*42e22086SApple OSS Distributions * 15*42e22086SApple OSS Distributions * Please obtain a copy of the License at 16*42e22086SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*42e22086SApple OSS Distributions * 18*42e22086SApple OSS Distributions * The Original Code and all software distributed under the License are 19*42e22086SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*42e22086SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*42e22086SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*42e22086SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*42e22086SApple OSS Distributions * Please see the License for the specific language governing rights and 24*42e22086SApple OSS Distributions * limitations under the License. 25*42e22086SApple OSS Distributions * 26*42e22086SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*42e22086SApple OSS Distributions */ 28*42e22086SApple OSS Distributions 29*42e22086SApple OSS Distributions 30*42e22086SApple OSS Distributions#include <machine/asm.h> 31*42e22086SApple OSS Distributions#include <mach/kern_return.h> 32*42e22086SApple OSS Distributions#include <arm64/proc_reg.h> 33*42e22086SApple OSS Distributions#include <arm64/exception_asm.h> 34*42e22086SApple OSS Distributions#include <pexpert/arm64/board_config.h> 35*42e22086SApple OSS Distributions 36*42e22086SApple OSS Distributions#include "assym.s" 37*42e22086SApple OSS Distributions 38*42e22086SApple OSS Distributions#if HAS_GUARDED_IO_FILTER 39*42e22086SApple OSS Distributions 40*42e22086SApple OSS Distributions .section __PPLTEXT,__text,regular,pure_instructions 41*42e22086SApple OSS Distributions .align 2 42*42e22086SApple OSS Distributions .globl EXT(io_filter_vtop) 43*42e22086SApple OSS DistributionsLEXT(io_filter_vtop) 44*42e22086SApple OSS Distributions ARM64_STACK_PROLOG 45*42e22086SApple OSS Distributions /* x9 - temp reg for the physical addr of the ioreg, x10 - draft reg. */ 46*42e22086SApple OSS Distributions at s1e1w, x0 // Get PA of the addr passed in for comparison. 47*42e22086SApple OSS Distributions // Use s1e1w flavor of at so permission is checked for writing from EL1. 48*42e22086SApple OSS Distributions isb sy 49*42e22086SApple OSS Distributions mrs x9, PAR_EL1 50*42e22086SApple OSS Distributions and x10, x9, #0x7ffffffffc000 // Extract the page-aligned address from PAR_EL1.PA[51:48] | PAR_EL1.PA[47:14]. 51*42e22086SApple OSS Distributions bfxil x10, x0, #0, #14 // Copy the page offset from the VA to assemble the PA. 52*42e22086SApple OSS Distributions tst x9, #0x1 // Check PAR_EL1.F to see if translation was successful. 53*42e22086SApple OSS Distributions csel x0, x10, xzr, eq // If translation was successful return PA, else 0. 54*42e22086SApple OSS Distributions 55*42e22086SApple OSS Distributions ARM64_STACK_EPILOG 56*42e22086SApple OSS Distributions#endif /* HAS_GUARDED_IO_FILTER */ 57