1 /*
2 * Copyright (C) 2025 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 */
17
18 #include "io_stack.h"
19
20 #include <kernel/vm.h>
21
get_io_stack()22 void *get_io_stack() {
23 static void *io_stack = nullptr;
24 if (io_stack == nullptr) {
25 auto status = vmm_alloc(vmm_get_kernel_aspace(), "uefi_io_stack",
26 kIoStackSize, &io_stack, PAGE_SIZE_SHIFT, 0, 0);
27 if (io_stack == nullptr) {
28 printf("Failed to allocated IO stack of size %zu error %d\n",
29 kIoStackSize, status);
30 return nullptr;
31 }
32 }
33 return io_stack;
34 }