Zephyr API 4.4.99
A Scalable Open Source RTOS
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qemu_fwcfg.h
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1/*
2 * Copyright (c) 2026 Maximilian Zimmermann
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
12
13#ifndef ZEPHYR_INCLUDE_DRIVERS_FIRMWARE_QEMU_FWCFG_H_
14#define ZEPHYR_INCLUDE_DRIVERS_FIRMWARE_QEMU_FWCFG_H_
15
24
25#include <stdbool.h>
26#include <stddef.h>
27#include <stdint.h>
28
29#include <zephyr/device.h>
30#include <zephyr/sys/util.h>
31
34#define FW_CFG_SIGNATURE 0x0000
36#define FW_CFG_ID 0x0001
38#define FW_CFG_FILE_DIR 0x0019
39
41#define FW_CFG_ID_F_TRADITIONAL BIT(0)
43#define FW_CFG_ID_F_DMA BIT(1)
45
58int qemu_fwcfg_read_item(const struct device *dev, uint16_t key, void *buf, size_t len);
59
75int qemu_fwcfg_write_item(const struct device *dev, uint16_t key, const void *buf, size_t len);
76
85int qemu_fwcfg_get_features(const struct device *dev, uint32_t *features);
86
98int qemu_fwcfg_find_file(const struct device *dev, const char *file, uint16_t *select,
99 uint32_t *size);
100
109bool qemu_fwcfg_dma_supported(const struct device *dev);
110
112
113#endif /* ZEPHYR_INCLUDE_DRIVERS_FIRMWARE_QEMU_FWCFG_H_ */
qemu_fwcfg_read_item
int qemu_fwcfg_read_item(const struct device *dev, uint16_t key, void *buf, size_t len)
Read data from an fw_cfg item.
qemu_fwcfg_dma_supported
bool qemu_fwcfg_dma_supported(const struct device *dev)
Check whether fw_cfg DMA feature is available.
qemu_fwcfg_find_file
int qemu_fwcfg_find_file(const struct device *dev, const char *file, uint16_t *select, uint32_t *size)
Look up a file entry in fw_cfg file directory.
qemu_fwcfg_get_features
int qemu_fwcfg_get_features(const struct device *dev, uint32_t *features)
Get fw_cfg feature bits reported by the device.
qemu_fwcfg_write_item
int qemu_fwcfg_write_item(const struct device *dev, uint16_t key, const void *buf, size_t len)
Write data to an fw_cfg item.
select
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout)
uint32_t
__UINT32_TYPE__ uint32_t
Definition stdint.h:90
uint16_t
__UINT16_TYPE__ uint16_t
Definition stdint.h:89
device
Runtime device structure (in ROM) per driver instance.
Definition device.h:513
util.h
Misc utilities.