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