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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>
enum qemu_fwcfg_items {
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)
#define FW_CFG_DMA_ENABLED (1 << 1)
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; /* structure to iterate file list */
};
struct fw_cfg_dma_access {
__be32 control;
__be32 length;
__be64 address;
};
struct fw_cfg_arch_ops {
void (*arch_read_pio)(uint16_t selector, uint32_t size,
void *address);
void (*arch_read_dma)(struct fw_cfg_dma_access *dma);
};
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;
/**
* Initialize QEMU fw_cfg interface
*
* @ops: arch specific read operations
*/
void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops);
void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
int qemu_fwcfg_read_firmware_list(void);
struct fw_file *qemu_fwcfg_find_file(const char *name);
/**
* Get system cpu number
*
* @return: cpu number in system
*/
int qemu_fwcfg_online_cpus(void);
/* helper functions to iterate firmware file list */
struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter);
struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter);
bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter);
bool qemu_fwcfg_present(void);
bool qemu_fwcfg_dma_present(void);
#endif
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