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