2 * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <linux/list.h>
12 enum qemu_fwcfg_items {
13 FW_CFG_SIGNATURE = 0x00,
16 FW_CFG_RAM_SIZE = 0x03,
17 FW_CFG_NOGRAPHIC = 0x04,
18 FW_CFG_NB_CPUS = 0x05,
19 FW_CFG_MACHINE_ID = 0x06,
20 FW_CFG_KERNEL_ADDR = 0x07,
21 FW_CFG_KERNEL_SIZE = 0x08,
22 FW_CFG_KERNEL_CMDLINE = 0x09,
23 FW_CFG_INITRD_ADDR = 0x0a,
24 FW_CFG_INITRD_SIZE = 0x0b,
25 FW_CFG_BOOT_DEVICE = 0x0c,
27 FW_CFG_BOOT_MENU = 0x0e,
28 FW_CFG_MAX_CPUS = 0x0f,
29 FW_CFG_KERNEL_ENTRY = 0x10,
30 FW_CFG_KERNEL_DATA = 0x11,
31 FW_CFG_INITRD_DATA = 0x12,
32 FW_CFG_CMDLINE_ADDR = 0x13,
33 FW_CFG_CMDLINE_SIZE = 0x14,
34 FW_CFG_CMDLINE_DATA = 0x15,
35 FW_CFG_SETUP_ADDR = 0x16,
36 FW_CFG_SETUP_SIZE = 0x17,
37 FW_CFG_SETUP_DATA = 0x18,
38 FW_CFG_FILE_DIR = 0x19,
39 FW_CFG_FILE_FIRST = 0x20,
40 FW_CFG_WRITE_CHANNEL = 0x4000,
41 FW_CFG_ARCH_LOCAL = 0x8000,
42 FW_CFG_INVALID = 0xffff,
46 BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
47 BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
48 BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
52 BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
53 BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
56 #define FW_CFG_FILE_SLOTS 0x10
57 #define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
58 #define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
60 #define FW_CFG_MAX_FILE_PATH 56
61 #define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
63 #define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
65 #define FW_CFG_DMA_ERROR (1 << 0)
66 #define FW_CFG_DMA_READ (1 << 1)
67 #define FW_CFG_DMA_SKIP (1 << 2)
68 #define FW_CFG_DMA_SELECT (1 << 3)
70 #define FW_CFG_DMA_ENABLED (1 << 1)
76 char name[FW_CFG_MAX_FILE_PATH];
80 struct fw_cfg_file cfg; /* firmware file information */
81 unsigned long addr; /* firmware file in-memory address */
82 struct list_head list; /* list node to link to fw_list */
85 struct fw_cfg_file_iter {
86 struct list_head *entry; /* structure to iterate file list */
89 struct fw_cfg_dma_access {
95 struct fw_cfg_arch_ops {
96 void (*arch_read_pio)(uint16_t selector, uint32_t size,
98 void (*arch_read_dma)(struct fw_cfg_dma_access *dma);
101 struct bios_linker_entry {
105 * COMMAND_ALLOCATE - allocate a table from @alloc.file
106 * subject to @alloc.align alignment (must be power of 2)
107 * and @alloc.zone (can be HIGH or FSEG) requirements.
109 * Must appear exactly once for each file, and before
110 * this file is referenced by any other command.
113 char file[BIOS_LINKER_LOADER_FILESZ];
119 * COMMAND_ADD_POINTER - patch the table (originating from
120 * @dest_file) at @pointer.offset, by adding a pointer to the
121 * table originating from @src_file. 1,2,4 or 8 byte unsigned
122 * addition is used depending on @pointer.size.
125 char dest_file[BIOS_LINKER_LOADER_FILESZ];
126 char src_file[BIOS_LINKER_LOADER_FILESZ];
132 * COMMAND_ADD_CHECKSUM - calculate checksum of the range
133 * specified by @cksum_start and @cksum_length fields,
134 * and then add the value at @cksum.offset.
135 * Checksum simply sums -X for each byte X in the range
139 char file[BIOS_LINKER_LOADER_FILESZ];
151 * Initialize QEMU fw_cfg interface
153 * @ops: arch specific read operations
155 void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops);
157 void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
158 int qemu_fwcfg_read_firmware_list(void);
159 struct fw_file *qemu_fwcfg_find_file(const char *name);
162 * Get system cpu number
164 * @return: cpu number in system
166 int qemu_fwcfg_online_cpus(void);
168 /* helper functions to iterate firmware file list */
169 struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter);
170 struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter);
171 bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter);
173 bool qemu_fwcfg_present(void);
174 bool qemu_fwcfg_dma_present(void);