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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
*/
#ifndef __FW_CFG__
#define __FW_CFG__
#include <linux/list.h>
/*
* List of firmware configuration item selectors. The official source of truth
* for these is the QEMU source itself; see
* https://github.com/qemu/qemu/blob/master/hw/nvram/fw_cfg.c
*/
enum {
FW_CFG_SIGNATURE = 0x00,
FW_CFG_ID = 0x01,
FW_CFG_UUID = 0x02,
FW_CFG_RAM_SIZE = 0x03,
FW_CFG_NOGRAPHIC = 0x04,
FW_CFG_NB_CPUS = 0x05,
FW_CFG_MACHINE_ID = 0x06,
FW_CFG_KERNEL_ADDR = 0x07,
FW_CFG_KERNEL_SIZE = 0x08,
FW_CFG_KERNEL_CMDLINE = 0x09,
FW_CFG_INITRD_ADDR = 0x0a,
FW_CFG_INITRD_SIZE = 0x0b,
FW_CFG_BOOT_DEVICE = 0x0c,
FW_CFG_NUMA = 0x0d,
FW_CFG_BOOT_MENU = 0x0e,
FW_CFG_MAX_CPUS = 0x0f,
FW_CFG_KERNEL_ENTRY = 0x10,
FW_CFG_KERNEL_DATA = 0x11,
FW_CFG_INITRD_DATA = 0x12,
FW_CFG_CMDLINE_ADDR = 0x13,
FW_CFG_CMDLINE_SIZE = 0x14,
FW_CFG_CMDLINE_DATA = 0x15,
FW_CFG_SETUP_ADDR = 0x16,
FW_CFG_SETUP_SIZE = 0x17,
FW_CFG_SETUP_DATA = 0x18,
FW_CFG_FILE_DIR = 0x19,
FW_CFG_FILE_FIRST = 0x20,
FW_CFG_WRITE_CHANNEL = 0x4000,
FW_CFG_ARCH_LOCAL = 0x8000,
FW_CFG_INVALID = 0xffff,
};
enum {
BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
};
enum {
BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
};
#define FW_CFG_FILE_SLOTS 0x10
#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
#define FW_CFG_MAX_FILE_PATH 56
#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
#define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
#define FW_CFG_DMA_ERROR (1 << 0)
#define FW_CFG_DMA_READ (1 << 1)
#define FW_CFG_DMA_SKIP (1 << 2)
#define FW_CFG_DMA_SELECT (1 << 3)
/* Bit set in FW_CFG_ID response to indicate DMA interface availability. */
#define FW_CFG_DMA_ENABLED (1 << 1)
/* Structs read from FW_CFG_FILE_DIR. */
struct fw_cfg_file {
__be32 size;
__be16 select;
__be16 reserved;
char name[FW_CFG_MAX_FILE_PATH];
};
struct fw_file {
struct fw_cfg_file cfg; /* firmware file information */
unsigned long addr; /* firmware file in-memory address */
struct list_head list; /* list node to link to fw_list */
};
struct fw_cfg_file_iter {
struct list_head *entry, *end; /* structures to iterate file list */
};
struct bios_linker_entry {
__le32 command;
union {
/*
* COMMAND_ALLOCATE - allocate a table from @alloc.file
* subject to @alloc.align alignment (must be power of 2)
* and @alloc.zone (can be HIGH or FSEG) requirements.
*
* Must appear exactly once for each file, and before
* this file is referenced by any other command.
*/
struct {
char file[BIOS_LINKER_LOADER_FILESZ];
__le32 align;
uint8_t zone;
} alloc;
/*
* COMMAND_ADD_POINTER - patch the table (originating from
* @dest_file) at @pointer.offset, by adding a pointer to the
* table originating from @src_file. 1,2,4 or 8 byte unsigned
* addition is used depending on @pointer.size.
*/
struct {
char dest_file[BIOS_LINKER_LOADER_FILESZ];
char src_file[BIOS_LINKER_LOADER_FILESZ];
__le32 offset;
uint8_t size;
} pointer;
/*
* COMMAND_ADD_CHECKSUM - calculate checksum of the range
* specified by @cksum_start and @cksum_length fields,
* and then add the value at @cksum.offset.
* Checksum simply sums -X for each byte X in the range
* using 8-bit math.
*/
struct {
char file[BIOS_LINKER_LOADER_FILESZ];
__le32 offset;
__le32 start;
__le32 length;
} cksum;
/* padding */
char pad[124];
};
} __packed;
/* DMA transfer control data between UCLASS_QFW and QEMU. */
struct qfw_dma {
__be32 control;
__be32 length;
__be64 address;
};
/* uclass per-device configuration information */
struct qfw_dev {
struct udevice *dev; /* Transport device */
bool dma_present; /* DMA interface usable? */
struct list_head fw_list; /* Cached firmware file list */
};
/* Ops used internally between UCLASS_QFW and its driver implementations. */
struct dm_qfw_ops {
/**
* read_entry_io() - Read a firmware config entry using the regular
* IO interface for the platform (either PIO or MMIO)
*
* Supply %FW_CFG_INVALID as the entry to continue a previous read. In
* this case, no selector will be issued before reading.
*
* @dev: Device to use
* @entry: Firmware config entry number (e.g. %FW_CFG_SIGNATURE)
* @size: Number of bytes to read
* @address: Target location for read
*/
void (*read_entry_io)(struct udevice *dev, u16 entry, u32 size,
void *address);
/**
* read_entry_dma() - Read a firmware config entry using the DMA
* interface
*
* Supply FW_CFG_INVALID as the entry to continue a previous read. In
* this case, no selector will be issued before reading.
*
* This method assumes DMA availability has already been confirmed.
*
* @dev: Device to use
* @dma: DMA transfer control struct
*/
void (*read_entry_dma)(struct udevice *dev, struct qfw_dma *dma);
};
#define dm_qfw_get_ops(dev) \
((struct dm_qfw_ops *)(dev)->driver->ops)
/**
* qfw_register() - Called by a qfw driver after successful probe.
* @dev: Device registering itself with the uclass.
*
* Used internally by driver implementations on successful probe.
*
* Return: 0 on success, negative otherwise.
*/
int qfw_register(struct udevice *dev);
struct udevice;
/**
* qfw_get_dev() - Get QEMU firmware config device.
* @devp: Pointer to be filled with address of the qfw device.
*
* Gets the active QEMU firmware config device, for use with qfw_read_entry()
* and others.
*
* Return: 0 on success, -ENODEV if the device is not available.
*/
int qfw_get_dev(struct udevice **devp);
/**
* qfw_read_entry() - Read a QEMU firmware config entry
* @dev: QFW device to use.
* @entry: Firmware config entry number (e.g. %FW_CFG_SIGNATURE).
* @size: Number of bytes to read.
* @address: Target location for read.
*
* Reads a QEMU firmware config entry using @dev. DMA will be used if the QEMU
* machine supports it, otherwise PIO/MMIO.
*/
void qfw_read_entry(struct udevice *dev, u16 entry, u32 size, void *address);
/**
* qfw_read_firmware_list() - Read and cache the QEMU firmware config file
* list.
* @dev: QFW device to use.
*
* Reads the QEMU firmware config file list, caching it against @dev for later
* use with qfw_find_file().
*
* If the list has already been read, does nothing and returns 0 (success).
*
* Return: 0 on success, -ENOMEM if unable to allocate.
*/
int qfw_read_firmware_list(struct udevice *dev);
/**
* qfw_find_file() - Find a file by name in the QEMU firmware config file
* list.
* @dev: QFW device to use.
* @name: Name of file to locate (e.g. "etc/table-loader").
*
* Finds a file by name in the QEMU firmware config file list cached against
* @dev. You must call qfw_read_firmware_list() successfully first for this to
* succeed.
*
* Return: Pointer to &struct fw_file if found, %NULL if not present.
*/
struct fw_file *qfw_find_file(struct udevice *dev, const char *name);
/**
* qfw_online_cpus() - Get number of CPUs in system from QEMU firmware config.
* @dev: QFW device to use.
*
* Asks QEMU to report how many CPUs it is emulating for the machine.
*
* Return: Number of CPUs in the system.
*/
int qfw_online_cpus(struct udevice *dev);
/**
* qfw_file_iter_init() - Start iterating cached firmware file list.
* @dev: QFW device to use.
* @iter: Iterator to be initialised.
*
* Starts iterating the cached firmware file list in @dev. You must call
* qfw_read_firmware_list() successfully first, otherwise you will always get
* an empty list.
*
* qfw_file_iter_init() returns the first &struct fw_file, but it may be
* invalid if the list is empty. Check that ``!qfw_file_iter_end(&iter)``
* first.
*
* Return: The first &struct fw_file item in the firmware file list, if any.
* Only valid when qfw_file_iter_end() is not true after the call.
*/
struct fw_file *qfw_file_iter_init(struct udevice *dev,
struct fw_cfg_file_iter *iter);
/**
* qfw_file_iter_next() - Iterate cached firmware file list.
* @iter: Iterator to use.
*
* Continues iterating the cached firmware file list in @dev. You must call
* qfw_file_iter_init() first to initialise it. Check that
* ``!qfw_file_iter_end(&iter)`` before using the return value of this
* function.
*
* Return: The next &struct fw_file item in the firmware file list. Only valid
* when qfw_file_iter_end() is not true after the call.
*/
struct fw_file *qfw_file_iter_next(struct fw_cfg_file_iter *iter);
/**
* qfw_file_iter_end() - Check if iter is at end of list.
* @iter: Iterator to use.
*
* Checks whether or not the iterator is at its end position. If so, the
* qfw_file_iter_init() or qfw_file_iter_next() call that immediately preceded
* returned invalid data.
*
* Return: True if the iterator is at its end; false otherwise.
*/
bool qfw_file_iter_end(struct fw_cfg_file_iter *iter);
/**
* qemu_cpu_fixup() - Fix up the CPUs for QEMU.
*
* Return: 0 on success, -ENODEV if no CPUs, -ENOMEM if out of memory, other <
* 0 on on other error.
*/
int qemu_cpu_fixup(void);
#endif