140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Benno Rice under sponsorship from
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* the FreeBSD Foundation.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <stand.h>
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#include <bootstrap.h>
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#include <efi.h>
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#include <efilib.h>
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#ifndef EFI_STAGING_SIZE
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#define EFI_STAGING_SIZE 32
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#endif
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#define STAGE_PAGES ((EFI_STAGING_SIZE) * 1024 * 1024 / 4096)
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EFI_PHYSICAL_ADDRESS staging, staging_end;
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int stage_offset_set = 0;
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ssize_t stage_offset;
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int
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efi_copy_init(void)
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{
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EFI_STATUS status;
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status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
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STAGE_PAGES, &staging);
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if (EFI_ERROR(status)) {
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printf("failed to allocate staging area: %lu\n",
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(unsigned long)(status & EFI_ERROR_MASK));
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return (status);
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}
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staging_end = staging + STAGE_PAGES * 4096;
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#if defined(__aarch64__) || defined(__arm__)
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/*
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* Round the kernel load address to a 2MiB value. This is needed
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* because the kernel builds a page table based on where it has
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* been loaded in physical address space. As the kernel will use
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* either a 1MiB or 2MiB page for this we need to make sure it
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* is correctly aligned for both cases.
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*/
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staging = roundup2(staging, 2 * 1024 * 1024);
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#endif
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return (0);
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}
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void *
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efi_translate(vm_offset_t ptr)
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{
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return ((void *)(ptr + stage_offset));
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}
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ssize_t
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efi_copyin(const void *src, vm_offset_t dest, const size_t len)
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{
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if (!stage_offset_set) {
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stage_offset = (vm_offset_t)staging - dest;
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stage_offset_set = 1;
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}
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/* XXX: Callers do not check for failure. */
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if (dest + stage_offset + len > staging_end) {
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errno = ENOMEM;
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return (-1);
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}
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bcopy(src, (void *)(dest + stage_offset), len);
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return (len);
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}
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ssize_t
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efi_copyout(const vm_offset_t src, void *dest, const size_t len)
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{
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/* XXX: Callers do not check for failure. */
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if (src + stage_offset + len > staging_end) {
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errno = ENOMEM;
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return (-1);
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}
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bcopy((void *)(src + stage_offset), dest, len);
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return (len);
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}
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ssize_t
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efi_readin(const int fd, vm_offset_t dest, const size_t len)
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{
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if (dest + stage_offset + len > staging_end) {
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errno = ENOMEM;
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return (-1);
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}
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return (read(fd, (void *)(dest + stage_offset), len));
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}
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void
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efi_copy_finish(void)
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{
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uint64_t *src, *dst, *last;
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src = (uint64_t *)staging;
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dst = (uint64_t *)(staging - stage_offset);
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last = (uint64_t *)(staging + STAGE_PAGES * EFI_PAGE_SIZE);
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while (src < last)
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*dst++ = *src++;
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}
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