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1 | /** @file\r |
2 | Internal interfaces specific to the QemuFwCfgLib instances in OvmfPkg.\r | |
3 | \r | |
4 | Copyright (C) 2016, Red Hat, Inc.\r | |
b049655d | 5 | Copyright (C) 2017, Advanced Micro Devices. All rights reserved\r |
5297c0bf | 6 | \r |
b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
5297c0bf LE |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #ifndef __QEMU_FW_CFG_LIB_INTERNAL_H__\r | |
12 | #define __QEMU_FW_CFG_LIB_INTERNAL_H__\r | |
13 | \r | |
14 | /**\r | |
15 | Returns a boolean indicating if the firmware configuration interface is\r | |
16 | available for library-internal purposes.\r | |
17 | \r | |
18 | This function never changes fw_cfg state.\r | |
19 | \r | |
20 | @retval TRUE The interface is available internally.\r | |
21 | @retval FALSE The interface is not available internally.\r | |
22 | **/\r | |
23 | BOOLEAN\r | |
24 | InternalQemuFwCfgIsAvailable (\r | |
25 | VOID\r | |
26 | );\r | |
27 | \r | |
2c8dcbc6 LE |
28 | /**\r |
29 | Returns a boolean indicating whether QEMU provides the DMA-like access method\r | |
30 | for fw_cfg.\r | |
31 | \r | |
32 | @retval TRUE The DMA-like access method is available.\r | |
33 | @retval FALSE The DMA-like access method is unavailable.\r | |
34 | **/\r | |
35 | BOOLEAN\r | |
36 | InternalQemuFwCfgDmaIsAvailable (\r | |
37 | VOID\r | |
38 | );\r | |
39 | \r | |
b049655d | 40 | /**\r |
f6c909ae BS |
41 | Transfer an array of bytes, or skip a number of bytes, using the DMA\r |
42 | interface.\r | |
b049655d | 43 | \r |
f6c909ae | 44 | @param[in] Size Size in bytes to transfer or skip.\r |
b049655d | 45 | \r |
f6c909ae BS |
46 | @param[in,out] Buffer Buffer to read data into or write data from. Ignored,\r |
47 | and may be NULL, if Size is zero, or Control is\r | |
48 | FW_CFG_DMA_CTL_SKIP.\r | |
b049655d | 49 | \r |
f6c909ae BS |
50 | @param[in] Control One of the following:\r |
51 | FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer.\r | |
52 | FW_CFG_DMA_CTL_READ - read from fw_cfg into Buffer.\r | |
53 | FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg.\r | |
b049655d BS |
54 | **/\r |
55 | VOID\r | |
f6c909ae | 56 | InternalQemuFwCfgDmaBytes (\r |
ac0a286f MK |
57 | IN UINT32 Size,\r |
58 | IN OUT VOID *Buffer OPTIONAL,\r | |
59 | IN UINT32 Control\r | |
b049655d BS |
60 | );\r |
61 | \r | |
5297c0bf | 62 | #endif\r |