/* $NetBSD: efi_runtime.c,v 1.2.2.1 2019/12/17 12:36:38 martin Exp $ */ /*- * Copyright (c) 2018 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jared McNeill . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: efi_runtime.c,v 1.2.2.1 2019/12/17 12:36:38 martin Exp $"); #include #include #include #include static kmutex_t efi_lock; static struct efi_systbl *ST = NULL; static struct efi_rt *RT = NULL; int arm_efirt_init(paddr_t efi_system_table) { const size_t sz = PAGE_SIZE * 2; vaddr_t va, cva; paddr_t cpa; va = uvm_km_alloc(kernel_map, sz, 0, UVM_KMF_VAONLY); if (va == 0) { aprint_error("%s: can't allocate VA\n", __func__); return ENOMEM; } for (cva = va, cpa = trunc_page(efi_system_table); cva < va + sz; cva += PAGE_SIZE, cpa += PAGE_SIZE) { pmap_kenter_pa(cva, cpa, VM_PROT_READ, 0); } pmap_update(pmap_kernel()); ST = (void *)(va + (efi_system_table - trunc_page(efi_system_table))); if (ST->st_hdr.th_sig != EFI_SYSTBL_SIG) { aprint_error("EFI: signature mismatch (%#lx != %#lx)\n", ST->st_hdr.th_sig, EFI_SYSTBL_SIG); return EINVAL; } RT = ST->st_rt; mutex_init(&efi_lock, MUTEX_DEFAULT, IPL_HIGH); return 0; } int arm_efirt_gettime(struct efi_tm *tm) { int error; if (RT == NULL || RT->rt_gettime == NULL) return ENXIO; mutex_enter(&efi_lock); if ((error = arm_efirt_md_enter()) == 0) { if (RT->rt_gettime(tm, NULL) != 0) error = EIO; } arm_efirt_md_exit(); mutex_exit(&efi_lock); return error; } int arm_efirt_settime(struct efi_tm *tm) { int error; if (RT == NULL || RT->rt_settime == NULL) return ENXIO; mutex_enter(&efi_lock); if ((error = arm_efirt_md_enter()) == 0) { if (RT->rt_settime(tm) != 0) error = EIO; } arm_efirt_md_exit(); mutex_exit(&efi_lock); return error; } int arm_efirt_reset(enum efi_reset type) { static int reset_called = false; int error; if (RT == NULL || RT->rt_reset == NULL) return ENXIO; mutex_enter(&efi_lock); if (reset_called == false) { reset_called = true; if ((error = arm_efirt_md_enter()) == 0) { if (RT->rt_reset(type, 0, 0, NULL) != 0) error = EIO; } arm_efirt_md_exit(); } else { error = EPERM; } mutex_exit(&efi_lock); return error; }