8347d20afe
The call to BS->AllocatePages can cause the memory map to become framented, causing BS->GetMemoryMap to return EFI_BUFFER_TOO_SMALL more than once. For example this can happen on the MinnowBoard Turbot, causing the boot to stop with an error. Avoid this by calling GetMemoryMap in a loop. Reviewed by: imp, tsoome, kevans Differential Revision: https://reviews.freebsd.org/D19341
299 lines
7.4 KiB
C
299 lines
7.4 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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#include "loader_efi.h"
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#if defined(__i386__) || defined(__amd64__)
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#include <machine/cpufunc.h>
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#include <machine/specialreg.h>
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/*
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* The code is excerpted from sys/x86/x86/identcpu.c: identify_cpu(),
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* identify_hypervisor(), and dev/hyperv/vmbus/hyperv.c: hyperv_identify().
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*/
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#define CPUID_LEAF_HV_MAXLEAF 0x40000000
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#define CPUID_LEAF_HV_INTERFACE 0x40000001
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#define CPUID_LEAF_HV_FEATURES 0x40000003
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#define CPUID_LEAF_HV_LIMITS 0x40000005
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#define CPUID_HV_IFACE_HYPERV 0x31237648 /* HV#1 */
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#define CPUID_HV_MSR_TIME_REFCNT 0x0002 /* MSR_HV_TIME_REF_COUNT */
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#define CPUID_HV_MSR_HYPERCALL 0x0020
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static int
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running_on_hyperv(void)
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{
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char hv_vendor[16];
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uint32_t regs[4];
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do_cpuid(1, regs);
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if ((regs[2] & CPUID2_HV) == 0)
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return (0);
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do_cpuid(CPUID_LEAF_HV_MAXLEAF, regs);
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if (regs[0] < CPUID_LEAF_HV_LIMITS)
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return (0);
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((uint32_t *)&hv_vendor)[0] = regs[1];
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((uint32_t *)&hv_vendor)[1] = regs[2];
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((uint32_t *)&hv_vendor)[2] = regs[3];
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hv_vendor[12] = '\0';
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if (strcmp(hv_vendor, "Microsoft Hv") != 0)
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return (0);
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do_cpuid(CPUID_LEAF_HV_INTERFACE, regs);
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if (regs[0] != CPUID_HV_IFACE_HYPERV)
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return (0);
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do_cpuid(CPUID_LEAF_HV_FEATURES, regs);
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if ((regs[0] & CPUID_HV_MSR_HYPERCALL) == 0)
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return (0);
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if ((regs[0] & CPUID_HV_MSR_TIME_REFCNT) == 0)
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return (0);
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return (1);
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}
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#define KERNEL_PHYSICAL_BASE (2*1024*1024)
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static void
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efi_verify_staging_size(unsigned long *nr_pages)
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{
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UINTN sz;
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EFI_MEMORY_DESCRIPTOR *map = NULL, *p;
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EFI_PHYSICAL_ADDRESS start, end;
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UINTN key, dsz;
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UINT32 dver;
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EFI_STATUS status;
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int i, ndesc;
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unsigned long available_pages = 0;
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sz = 0;
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for (;;) {
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status = BS->GetMemoryMap(&sz, map, &key, &dsz, &dver);
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if (!EFI_ERROR(status))
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break;
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if (status != EFI_BUFFER_TOO_SMALL) {
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printf("Can't read memory map: %lu\n",
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EFI_ERROR_CODE(status));
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goto out;
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}
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free(map);
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/* Allocate 10 descriptors more than the size reported,
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* to allow for any fragmentation caused by calling
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* malloc */
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map = malloc(sz + (10 * dsz));
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if (map == NULL) {
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printf("Unable to allocate memory\n");
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goto out;
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}
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}
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ndesc = sz / dsz;
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for (i = 0, p = map; i < ndesc;
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i++, p = NextMemoryDescriptor(p, dsz)) {
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start = p->PhysicalStart;
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end = start + p->NumberOfPages * EFI_PAGE_SIZE;
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if (KERNEL_PHYSICAL_BASE < start ||
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KERNEL_PHYSICAL_BASE >= end)
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continue;
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available_pages = p->NumberOfPages -
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((KERNEL_PHYSICAL_BASE - start) >> EFI_PAGE_SHIFT);
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break;
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}
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if (available_pages == 0) {
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printf("Can't find valid memory map for staging area!\n");
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goto out;
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}
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i++;
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p = NextMemoryDescriptor(p, dsz);
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for ( ; i < ndesc;
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i++, p = NextMemoryDescriptor(p, dsz)) {
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if (p->Type != EfiConventionalMemory &&
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p->Type != EfiLoaderData)
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break;
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if (p->PhysicalStart != end)
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break;
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end = p->PhysicalStart + p->NumberOfPages * EFI_PAGE_SIZE;
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available_pages += p->NumberOfPages;
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}
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if (*nr_pages > available_pages) {
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printf("Staging area's size is reduced: %ld -> %ld!\n",
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*nr_pages, available_pages);
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*nr_pages = available_pages;
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}
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out:
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free(map);
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}
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#endif /* __i386__ || __amd64__ */
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#ifndef EFI_STAGING_SIZE
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#define EFI_STAGING_SIZE 64
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#endif
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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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unsigned long nr_pages;
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nr_pages = EFI_SIZE_TO_PAGES((EFI_STAGING_SIZE) * 1024 * 1024);
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#if defined(__i386__) || defined(__amd64__)
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/*
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* We'll decrease nr_pages, if it's too big. Currently we only
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* apply this to FreeBSD VM running on Hyper-V. Why? Please see
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* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211746#c28
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*/
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if (running_on_hyperv())
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efi_verify_staging_size(&nr_pages);
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/*
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* The staging area must reside in the the first 1GB physical
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* memory: see elf64_exec() in
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* boot/efi/loader/arch/amd64/elf64_freebsd.c.
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*/
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staging = 1024*1024*1024;
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status = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData,
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nr_pages, &staging);
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#else
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status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
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nr_pages, &staging);
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#endif
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if (EFI_ERROR(status)) {
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printf("failed to allocate staging area: %lu\n",
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EFI_ERROR_CODE(status));
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return (status);
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}
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staging_end = staging + nr_pages * EFI_PAGE_SIZE;
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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 *)(uintptr_t)staging;
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dst = (uint64_t *)(uintptr_t)(staging - stage_offset);
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last = (uint64_t *)(uintptr_t)staging_end;
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while (src < last)
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*dst++ = *src++;
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}
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