mirror of
https://git.proxmox.com/git/efi-boot-shim
synced 2025-05-01 05:31:50 +00:00
8807e36aae
I'm told rebooting is sometimes unreliable when called here, and we'll get bootx64.efi loaded anyway. I'll just assume that's true and try to load the first option, since it's clearly what we'd prefer happens next. Signed-off-by: Peter Jones <pjones@redhat.com>
666 lines
16 KiB
C
666 lines
16 KiB
C
/*
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* Copyright 2012-2013 Red Hat, Inc.
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* All rights reserved.
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*
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* See "COPYING" for license terms.
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*
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* Author(s): Peter Jones <pjones@redhat.com>
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*/
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#include <efi.h>
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#include <efilib.h>
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#include "ucs2.h"
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EFI_LOADED_IMAGE *this_image = NULL;
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static EFI_STATUS
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get_file_size(EFI_FILE_HANDLE fh, UINT64 *retsize)
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{
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EFI_STATUS rc;
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void *buffer = NULL;
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UINTN bs = 0;
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EFI_GUID finfo = EFI_FILE_INFO_ID;
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/* The API here is "Call it once with bs=0, it fills in bs,
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* then allocate a buffer and ask again to get it filled. */
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rc = uefi_call_wrapper(fh->GetInfo, 4, fh, &finfo, &bs, NULL);
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if (rc == EFI_BUFFER_TOO_SMALL) {
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buffer = AllocateZeroPool(bs);
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if (!buffer) {
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Print(L"Could not allocate memory\n");
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return EFI_OUT_OF_RESOURCES;
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}
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rc = uefi_call_wrapper(fh->GetInfo, 4, fh, &finfo,
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&bs, buffer);
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}
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/* This checks *either* the error from the first GetInfo, if it isn't
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* the EFI_BUFFER_TOO_SMALL we're expecting, or the second GetInfo call
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* in *any* case. */
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if (EFI_ERROR(rc)) {
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Print(L"Could not get file info: %d\n", rc);
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if (buffer)
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FreePool(buffer);
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return rc;
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}
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EFI_FILE_INFO *fi = buffer;
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*retsize = fi->FileSize;
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FreePool(buffer);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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read_file(EFI_FILE_HANDLE fh, CHAR16 *fullpath, CHAR16 **buffer, UINT64 *bs)
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{
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EFI_FILE_HANDLE fh2;
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EFI_STATUS rc = uefi_call_wrapper(fh->Open, 5, fh, &fh2, fullpath,
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EFI_FILE_READ_ONLY, 0);
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if (EFI_ERROR(rc)) {
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Print(L"Couldn't open \"%s\": %d\n", fullpath, rc);
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return rc;
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}
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UINT64 len = 0;
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CHAR16 *b = NULL;
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rc = get_file_size(fh2, &len);
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if (EFI_ERROR(rc)) {
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uefi_call_wrapper(fh2->Close, 1, fh2);
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return rc;
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}
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b = AllocateZeroPool(len + 2);
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if (!buffer) {
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Print(L"Could not allocate memory\n");
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uefi_call_wrapper(fh2->Close, 1, fh2);
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return EFI_OUT_OF_RESOURCES;
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}
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rc = uefi_call_wrapper(fh->Read, 3, fh, &len, b);
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if (EFI_ERROR(rc)) {
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FreePool(buffer);
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uefi_call_wrapper(fh2->Close, 1, fh2);
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Print(L"Could not read file: %d\n", rc);
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return rc;
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}
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*buffer = b;
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*bs = len;
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uefi_call_wrapper(fh2->Close, 1, fh2);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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make_full_path(CHAR16 *dirname, CHAR16 *filename, CHAR16 **out, UINT64 *outlen)
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{
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UINT64 len;
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len = StrLen(dirname) + StrLen(filename) + StrLen(L"\\EFI\\\\") + 2;
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CHAR16 *fullpath = AllocateZeroPool(len*sizeof(CHAR16));
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if (!fullpath) {
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Print(L"Could not allocate memory\n");
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return EFI_OUT_OF_RESOURCES;
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}
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StrCat(fullpath, L"\\EFI\\");
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StrCat(fullpath, dirname);
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StrCat(fullpath, L"\\");
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StrCat(fullpath, filename);
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*out = fullpath;
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*outlen = len;
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return EFI_SUCCESS;
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}
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CHAR16 *bootorder = NULL;
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int nbootorder = 0;
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EFI_DEVICE_PATH *first_new_option = NULL;
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VOID *first_new_option_args = NULL;
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UINTN first_new_option_size = 0;
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EFI_STATUS
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add_boot_option(EFI_DEVICE_PATH *dp, CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
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{
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static int i = 0;
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CHAR16 varname[] = L"Boot0000";
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CHAR16 hexmap[] = L"0123456789ABCDEF";
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EFI_GUID global = EFI_GLOBAL_VARIABLE;
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EFI_STATUS rc;
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for(; i <= 0xffff; i++) {
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varname[4] = hexmap[(i & 0xf000) >> 12];
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varname[5] = hexmap[(i & 0x0f00) >> 8];
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varname[6] = hexmap[(i & 0x00f0) >> 4];
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varname[7] = hexmap[(i & 0x000f) >> 0];
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void *var = LibGetVariable(varname, &global);
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if (!var) {
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int size = sizeof(UINT32) + sizeof (UINT16) +
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StrLen(label)*2 + 2 + DevicePathSize(dp) +
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StrLen(arguments) * 2 + 2;
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CHAR8 *data = AllocateZeroPool(size);
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CHAR8 *cursor = data;
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*(UINT32 *)cursor = LOAD_OPTION_ACTIVE;
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cursor += sizeof (UINT32);
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*(UINT16 *)cursor = DevicePathSize(dp);
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cursor += sizeof (UINT16);
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StrCpy((CHAR16 *)cursor, label);
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cursor += StrLen(label)*2 + 2;
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CopyMem(cursor, dp, DevicePathSize(dp));
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cursor += DevicePathSize(dp);
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StrCpy((CHAR16 *)cursor, arguments);
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Print(L"Creating boot entry \"%s\" with label \"%s\" "
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L"for file \"%s\"\n",
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varname, label, filename);
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rc = uefi_call_wrapper(RT->SetVariable, 5, varname,
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&global, EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS,
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size, data);
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FreePool(data);
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if (EFI_ERROR(rc)) {
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Print(L"Could not create variable: %d\n", rc);
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return rc;
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}
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CHAR16 *newbootorder = AllocateZeroPool(sizeof (CHAR16)
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* (nbootorder + 1));
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if (!newbootorder)
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return EFI_OUT_OF_RESOURCES;
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int j = 0;
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if (nbootorder) {
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for (j = 0; j < nbootorder; j++)
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newbootorder[j] = bootorder[j];
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FreePool(bootorder);
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}
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newbootorder[j] = i & 0xffff;
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bootorder = newbootorder;
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nbootorder += 1;
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#ifdef DEBUG_FALLBACK
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Print(L"nbootorder: %d\nBootOrder: ", nbootorder);
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for (j = 0 ; j < nbootorder ; j++)
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Print(L"%04x ", bootorder[j]);
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Print(L"\n");
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#endif
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return EFI_SUCCESS;
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}
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}
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return EFI_OUT_OF_RESOURCES;
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}
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EFI_STATUS
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update_boot_order(void)
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{
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CHAR16 *oldbootorder;
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UINTN size;
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EFI_GUID global = EFI_GLOBAL_VARIABLE;
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CHAR16 *newbootorder = NULL;
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oldbootorder = LibGetVariableAndSize(L"BootOrder", &global, &size);
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if (oldbootorder) {
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int n = size / sizeof (CHAR16) + nbootorder;
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newbootorder = AllocateZeroPool(n * sizeof (CHAR16));
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if (!newbootorder)
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return EFI_OUT_OF_RESOURCES;
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CopyMem(newbootorder, bootorder, nbootorder * sizeof (CHAR16));
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CopyMem(newbootorder + nbootorder, oldbootorder, size);
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size = n * sizeof (CHAR16);
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} else {
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size = nbootorder * sizeof(CHAR16);
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newbootorder = AllocateZeroPool(size);
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if (!newbootorder)
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return EFI_OUT_OF_RESOURCES;
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CopyMem(newbootorder, bootorder, size);
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}
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#ifdef DEBUG_FALLBACK
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Print(L"nbootorder: %d\nBootOrder: ", size / sizeof (CHAR16));
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int j;
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for (j = 0 ; j < size / sizeof (CHAR16); j++)
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Print(L"%04x ", newbootorder[j]);
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Print(L"\n");
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#endif
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if (oldbootorder) {
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LibDeleteVariable(L"BootOrder", &global);
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FreePool(oldbootorder);
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}
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EFI_STATUS rc;
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rc = uefi_call_wrapper(RT->SetVariable, 5, L"BootOrder", &global,
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EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS,
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size, newbootorder);
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FreePool(newbootorder);
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return rc;
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}
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EFI_STATUS
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add_to_boot_list(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
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{
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CHAR16 *fullpath = NULL;
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UINT64 pathlen = 0;
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EFI_STATUS rc = EFI_SUCCESS;
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rc = make_full_path(dirname, filename, &fullpath, &pathlen);
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if (EFI_ERROR(rc))
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return rc;
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EFI_DEVICE_PATH *dph = NULL, *dpf = NULL, *dp = NULL;
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dph = DevicePathFromHandle(this_image->DeviceHandle);
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if (!dph) {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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dpf = FileDevicePath(fh, fullpath);
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if (!dpf) {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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dp = AppendDevicePath(dph, dpf);
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if (!dp) {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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#ifdef DEBUG_FALLBACK
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UINTN s = DevicePathSize(dp);
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int i;
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UINT8 *dpv = (void *)dp;
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for (i = 0; i < s; i++) {
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if (i > 0 && i % 16 == 0)
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Print(L"\n");
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Print(L"%02x ", dpv[i]);
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}
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Print(L"\n");
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CHAR16 *dps = DevicePathToStr(dp);
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Print(L"device path: \"%s\"\n", dps);
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#endif
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if (!first_new_option) {
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CHAR16 *dps = DevicePathToStr(dp);
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Print(L"device path: \"%s\"\n", dps);
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first_new_option = DuplicateDevicePath(dp);
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first_new_option_args = arguments;
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first_new_option_size = StrLen(arguments) * sizeof (CHAR16);
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}
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add_boot_option(dp, fullpath, label, arguments);
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err:
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if (dpf)
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FreePool(dpf);
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if (dp)
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FreePool(dp);
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if (fullpath)
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FreePool(fullpath);
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return rc;
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}
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EFI_STATUS
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populate_stanza(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename, CHAR16 *csv)
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{
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#ifdef DEBUG_FALLBACK
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Print(L"CSV data: \"%s\"\n", csv);
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#endif
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CHAR16 *file = csv;
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UINTN comma0 = StrCSpn(csv, L",");
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if (comma0 == 0)
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return EFI_INVALID_PARAMETER;
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file[comma0] = L'\0';
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#ifdef DEBUG_FALLBACK
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Print(L"filename: \"%s\"\n", file);
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#endif
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CHAR16 *label = csv + comma0 + 1;
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UINTN comma1 = StrCSpn(label, L",");
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if (comma1 == 0)
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return EFI_INVALID_PARAMETER;
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label[comma1] = L'\0';
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#ifdef DEBUG_FALLBACK
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Print(L"label: \"%s\"\n", label);
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#endif
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CHAR16 *arguments = csv + comma0 +1 + comma1 +1;
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UINTN comma2 = StrCSpn(arguments, L",");
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arguments[comma2] = L'\0';
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/* This one is optional, so don't check if comma2 is 0 */
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#ifdef DEBUG_FALLBACK
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Print(L"arguments: \"%s\"\n", arguments);
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#endif
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add_to_boot_list(fh, dirname, file, label, arguments);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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try_boot_csv(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename)
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{
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CHAR16 *fullpath = NULL;
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UINT64 pathlen = 0;
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EFI_STATUS rc;
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rc = make_full_path(dirname, filename, &fullpath, &pathlen);
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if (EFI_ERROR(rc))
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return rc;
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#ifdef DEBUG_FALLBACK
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Print(L"Found file \"%s\"\n", fullpath);
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#endif
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CHAR16 *buffer;
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UINT64 bs;
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rc = read_file(fh, fullpath, &buffer, &bs);
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if (EFI_ERROR(rc)) {
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Print(L"Could not read file \"%s\": %d\n", fullpath, rc);
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FreePool(fullpath);
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return rc;
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}
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FreePool(fullpath);
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#ifdef DEBUG_FALLBACK
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Print(L"File looks like:\n%s\n", buffer);
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#endif
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CHAR16 *start = buffer;
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/* The file may or may not start with the Unicode byte order marker.
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* Sadness ensues. Since UEFI is defined as LE, I'm going to decree
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* that these files must also be LE.
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*
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* IT IS THUS SO.
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*
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* But if we find the LE byte order marker, just skip it.
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*/
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if (*start == 0xfeff)
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start++;
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while (*start) {
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while (*start == L'\r' || *start == L'\n')
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start++;
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UINTN l = StrCSpn(start, L"\r\n");
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if (l == 0) {
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if (start[l] == L'\0')
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break;
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start++;
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continue;
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}
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CHAR16 c = start[l];
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start[l] = L'\0';
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populate_stanza(fh, dirname, filename, start);
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start[l] = c;
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start += l;
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}
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FreePool(buffer);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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find_boot_csv(EFI_FILE_HANDLE fh, CHAR16 *dirname)
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{
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EFI_STATUS rc;
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void *buffer = NULL;
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UINTN bs = 0;
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EFI_GUID finfo = EFI_FILE_INFO_ID;
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/* The API here is "Call it once with bs=0, it fills in bs,
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* then allocate a buffer and ask again to get it filled. */
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rc = uefi_call_wrapper(fh->GetInfo, 4, fh, &finfo, &bs, NULL);
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if (rc == EFI_BUFFER_TOO_SMALL) {
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buffer = AllocateZeroPool(bs);
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if (!buffer) {
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Print(L"Could not allocate memory\n");
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return EFI_OUT_OF_RESOURCES;
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}
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rc = uefi_call_wrapper(fh->GetInfo, 4, fh, &finfo,
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&bs, buffer);
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}
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/* This checks *either* the error from the first GetInfo, if it isn't
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* the EFI_BUFFER_TOO_SMALL we're expecting, or the second GetInfo call
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* in *any* case. */
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if (EFI_ERROR(rc)) {
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Print(L"Could not get info for \"%s\": %d\n", dirname, rc);
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if (buffer)
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FreePool(buffer);
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return rc;
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}
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EFI_FILE_INFO *fi = buffer;
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if (!(fi->Attribute & EFI_FILE_DIRECTORY)) {
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FreePool(buffer);
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return EFI_SUCCESS;
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}
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FreePool(buffer);
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bs = 0;
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do {
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bs = 0;
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rc = uefi_call_wrapper(fh->Read, 3, fh, &bs, NULL);
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if (rc == EFI_BUFFER_TOO_SMALL) {
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buffer = AllocateZeroPool(bs);
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if (!buffer) {
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Print(L"Could not allocate memory\n");
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return EFI_OUT_OF_RESOURCES;
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}
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rc = uefi_call_wrapper(fh->Read, 3, fh, &bs, buffer);
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}
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if (EFI_ERROR(rc)) {
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Print(L"Could not read \\EFI\\%s\\: %d\n", dirname, rc);
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FreePool(buffer);
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return rc;
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}
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if (bs == 0)
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break;
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fi = buffer;
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if (!StrCaseCmp(fi->FileName, L"boot.csv")) {
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EFI_FILE_HANDLE fh2;
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rc = uefi_call_wrapper(fh->Open, 5, fh, &fh2,
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fi->FileName,
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EFI_FILE_READ_ONLY, 0);
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if (EFI_ERROR(rc) || fh2 == NULL) {
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Print(L"Couldn't open \\EFI\\%s\\%s: %d\n",
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dirname, fi->FileName, rc);
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FreePool(buffer);
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buffer = NULL;
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continue;
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}
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rc = try_boot_csv(fh2, dirname, fi->FileName);
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uefi_call_wrapper(fh2->Close, 1, fh2);
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}
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FreePool(buffer);
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buffer = NULL;
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} while (bs != 0);
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rc = EFI_SUCCESS;
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return rc;
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}
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EFI_STATUS
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find_boot_options(EFI_HANDLE device)
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{
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EFI_STATUS rc = EFI_SUCCESS;
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EFI_FILE_IO_INTERFACE *fio = NULL;
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rc = uefi_call_wrapper(BS->HandleProtocol, 3, device,
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&FileSystemProtocol, &fio);
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if (EFI_ERROR(rc)) {
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Print(L"Couldn't find file system: %d\n", rc);
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return rc;
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}
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/* EFI_FILE_HANDLE is a pointer to an EFI_FILE, and I have
|
|
* *no idea* what frees the memory allocated here. Hopefully
|
|
* Close() does. */
|
|
EFI_FILE_HANDLE fh = NULL;
|
|
rc = uefi_call_wrapper(fio->OpenVolume, 2, fio, &fh);
|
|
if (EFI_ERROR(rc) || fh == NULL) {
|
|
Print(L"Couldn't open file system: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
EFI_FILE_HANDLE fh2 = NULL;
|
|
rc = uefi_call_wrapper(fh->Open, 5, fh, &fh2, L"EFI",
|
|
EFI_FILE_READ_ONLY, 0);
|
|
if (EFI_ERROR(rc) || fh2 == NULL) {
|
|
Print(L"Couldn't open EFI: %d\n", rc);
|
|
uefi_call_wrapper(fh->Close, 1, fh);
|
|
return rc;
|
|
}
|
|
rc = uefi_call_wrapper(fh2->SetPosition, 2, fh2, 0);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"Couldn't set file position: %d\n", rc);
|
|
uefi_call_wrapper(fh2->Close, 1, fh2);
|
|
uefi_call_wrapper(fh->Close, 1, fh);
|
|
return rc;
|
|
}
|
|
|
|
void *buffer;
|
|
UINTN bs;
|
|
do {
|
|
bs = 0;
|
|
rc = uefi_call_wrapper(fh2->Read, 3, fh2, &bs, NULL);
|
|
if (rc == EFI_BUFFER_TOO_SMALL ||
|
|
(rc == EFI_SUCCESS && bs != 0)) {
|
|
buffer = AllocateZeroPool(bs);
|
|
if (!buffer) {
|
|
Print(L"Could not allocate memory\n");
|
|
/* sure, this might work, why not? */
|
|
uefi_call_wrapper(fh2->Close, 1, fh2);
|
|
uefi_call_wrapper(fh->Close, 1, fh);
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
rc = uefi_call_wrapper(fh2->Read, 3, fh2, &bs, buffer);
|
|
}
|
|
if (bs == 0)
|
|
break;
|
|
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"Could not read \\EFI\\: %d\n", rc);
|
|
if (buffer) {
|
|
FreePool(buffer);
|
|
buffer = NULL;
|
|
}
|
|
uefi_call_wrapper(fh2->Close, 1, fh2);
|
|
uefi_call_wrapper(fh->Close, 1, fh);
|
|
return rc;
|
|
}
|
|
EFI_FILE_INFO *fi = buffer;
|
|
|
|
if (!(fi->Attribute & EFI_FILE_DIRECTORY)) {
|
|
FreePool(buffer);
|
|
buffer = NULL;
|
|
continue;
|
|
}
|
|
if (!StrCmp(fi->FileName, L".") ||
|
|
!StrCmp(fi->FileName, L"..") ||
|
|
!StrCaseCmp(fi->FileName, L"BOOT")) {
|
|
FreePool(buffer);
|
|
buffer = NULL;
|
|
continue;
|
|
}
|
|
#ifdef DEBUG_FALLBACK
|
|
Print(L"Found directory named \"%s\"\n", fi->FileName);
|
|
#endif
|
|
|
|
EFI_FILE_HANDLE fh3;
|
|
rc = uefi_call_wrapper(fh->Open, 5, fh2, &fh3, fi->FileName,
|
|
EFI_FILE_READ_ONLY, 0);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"%d Couldn't open %s: %d\n", __LINE__, fi->FileName, rc);
|
|
FreePool(buffer);
|
|
buffer = NULL;
|
|
continue;
|
|
}
|
|
|
|
rc = find_boot_csv(fh3, fi->FileName);
|
|
FreePool(buffer);
|
|
buffer = NULL;
|
|
if (rc == EFI_OUT_OF_RESOURCES)
|
|
break;
|
|
|
|
} while (1);
|
|
|
|
if (rc == EFI_SUCCESS && nbootorder > 0)
|
|
rc = update_boot_order();
|
|
|
|
uefi_call_wrapper(fh2->Close, 1, fh2);
|
|
uefi_call_wrapper(fh->Close, 1, fh);
|
|
return rc;
|
|
}
|
|
|
|
static EFI_STATUS
|
|
try_start_first_option(EFI_HANDLE parent_image_handle)
|
|
{
|
|
EFI_STATUS rc;
|
|
EFI_HANDLE image_handle;
|
|
|
|
if (!first_new_option) {
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
rc = uefi_call_wrapper(BS->LoadImage, 6, 0, parent_image_handle,
|
|
first_new_option, NULL, 0,
|
|
&image_handle);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"LoadImage failed: %d\n", rc);
|
|
uefi_call_wrapper(BS->Stall, 1, 2000000);
|
|
return rc;
|
|
}
|
|
rc = uefi_call_wrapper(BS->StartImage, 3, image_handle, NULL, NULL);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"StartImage failed: %d\n", rc);
|
|
uefi_call_wrapper(BS->Stall, 1, 2000000);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
EFI_STATUS
|
|
efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
|
|
{
|
|
EFI_STATUS rc;
|
|
|
|
InitializeLib(image, systab);
|
|
|
|
rc = uefi_call_wrapper(BS->HandleProtocol, 3, image, &LoadedImageProtocol, (void *)&this_image);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"Error: could not find loaded image: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
Print(L"System BootOrder not found. Initializing defaults.\n");
|
|
|
|
rc = find_boot_options(this_image->DeviceHandle);
|
|
if (EFI_ERROR(rc)) {
|
|
Print(L"Error: could not find boot options: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
try_start_first_option(image);
|
|
|
|
Print(L"Reset System\n");
|
|
uefi_call_wrapper(RT->ResetSystem, 4, EfiResetCold,
|
|
EFI_SUCCESS, 0, NULL);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|