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include/qfw.h
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/* * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com> * * SPDX-License-Identifier: GPL-2.0+ */ #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 |