176 lines
4.3 KiB
C
176 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
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*/
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#ifndef __FW_CFG__
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#define __FW_CFG__
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#include <linux/list.h>
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enum qemu_fwcfg_items {
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FW_CFG_SIGNATURE = 0x00,
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FW_CFG_ID = 0x01,
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FW_CFG_UUID = 0x02,
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FW_CFG_RAM_SIZE = 0x03,
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FW_CFG_NOGRAPHIC = 0x04,
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FW_CFG_NB_CPUS = 0x05,
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FW_CFG_MACHINE_ID = 0x06,
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FW_CFG_KERNEL_ADDR = 0x07,
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FW_CFG_KERNEL_SIZE = 0x08,
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FW_CFG_KERNEL_CMDLINE = 0x09,
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FW_CFG_INITRD_ADDR = 0x0a,
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FW_CFG_INITRD_SIZE = 0x0b,
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FW_CFG_BOOT_DEVICE = 0x0c,
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FW_CFG_NUMA = 0x0d,
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FW_CFG_BOOT_MENU = 0x0e,
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FW_CFG_MAX_CPUS = 0x0f,
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FW_CFG_KERNEL_ENTRY = 0x10,
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FW_CFG_KERNEL_DATA = 0x11,
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FW_CFG_INITRD_DATA = 0x12,
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FW_CFG_CMDLINE_ADDR = 0x13,
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FW_CFG_CMDLINE_SIZE = 0x14,
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FW_CFG_CMDLINE_DATA = 0x15,
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FW_CFG_SETUP_ADDR = 0x16,
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FW_CFG_SETUP_SIZE = 0x17,
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FW_CFG_SETUP_DATA = 0x18,
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FW_CFG_FILE_DIR = 0x19,
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FW_CFG_FILE_FIRST = 0x20,
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FW_CFG_WRITE_CHANNEL = 0x4000,
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FW_CFG_ARCH_LOCAL = 0x8000,
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FW_CFG_INVALID = 0xffff,
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};
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enum {
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BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
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BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
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BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
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};
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enum {
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BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
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BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
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};
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#define FW_CFG_FILE_SLOTS 0x10
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#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
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#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
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#define FW_CFG_MAX_FILE_PATH 56
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#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
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#define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
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#define FW_CFG_DMA_ERROR (1 << 0)
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#define FW_CFG_DMA_READ (1 << 1)
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#define FW_CFG_DMA_SKIP (1 << 2)
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#define FW_CFG_DMA_SELECT (1 << 3)
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#define FW_CFG_DMA_ENABLED (1 << 1)
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struct fw_cfg_file {
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__be32 size;
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__be16 select;
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__be16 reserved;
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char name[FW_CFG_MAX_FILE_PATH];
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};
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struct fw_file {
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struct fw_cfg_file cfg; /* firmware file information */
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unsigned long addr; /* firmware file in-memory address */
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struct list_head list; /* list node to link to fw_list */
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};
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struct fw_cfg_file_iter {
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struct list_head *entry; /* structure to iterate file list */
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};
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struct fw_cfg_dma_access {
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__be32 control;
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__be32 length;
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__be64 address;
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};
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struct fw_cfg_arch_ops {
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void (*arch_read_pio)(uint16_t selector, uint32_t size,
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void *address);
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void (*arch_read_dma)(struct fw_cfg_dma_access *dma);
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};
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struct bios_linker_entry {
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__le32 command;
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union {
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/*
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* COMMAND_ALLOCATE - allocate a table from @alloc.file
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* subject to @alloc.align alignment (must be power of 2)
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* and @alloc.zone (can be HIGH or FSEG) requirements.
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*
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* Must appear exactly once for each file, and before
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* this file is referenced by any other command.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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__le32 align;
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uint8_t zone;
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} alloc;
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/*
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* COMMAND_ADD_POINTER - patch the table (originating from
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* @dest_file) at @pointer.offset, by adding a pointer to the
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* table originating from @src_file. 1,2,4 or 8 byte unsigned
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* addition is used depending on @pointer.size.
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*/
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struct {
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char dest_file[BIOS_LINKER_LOADER_FILESZ];
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char src_file[BIOS_LINKER_LOADER_FILESZ];
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__le32 offset;
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uint8_t size;
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} pointer;
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/*
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* COMMAND_ADD_CHECKSUM - calculate checksum of the range
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* specified by @cksum_start and @cksum_length fields,
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* and then add the value at @cksum.offset.
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* Checksum simply sums -X for each byte X in the range
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* using 8-bit math.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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__le32 offset;
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__le32 start;
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__le32 length;
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} cksum;
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/* padding */
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char pad[124];
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};
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} __packed;
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/**
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* Initialize QEMU fw_cfg interface
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*
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* @ops: arch specific read operations
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*/
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void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops);
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void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
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int qemu_fwcfg_read_firmware_list(void);
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struct fw_file *qemu_fwcfg_find_file(const char *name);
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/**
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* Get system cpu number
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*
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* @return: cpu number in system
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*/
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int qemu_fwcfg_online_cpus(void);
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/* helper functions to iterate firmware file list */
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struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter);
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struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter);
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bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter);
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bool qemu_fwcfg_present(void);
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bool qemu_fwcfg_dma_present(void);
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#endif
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