2 * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
10 #define FW_CONTROL_PORT 0x510
11 #define FW_DATA_PORT 0x511
12 #define FW_DMA_PORT_LOW 0x514
13 #define FW_DMA_PORT_HIGH 0x518
15 #include <linux/list.h>
17 enum qemu_fwcfg_items {
18 FW_CFG_SIGNATURE = 0x00,
21 FW_CFG_RAM_SIZE = 0x03,
22 FW_CFG_NOGRAPHIC = 0x04,
23 FW_CFG_NB_CPUS = 0x05,
24 FW_CFG_MACHINE_ID = 0x06,
25 FW_CFG_KERNEL_ADDR = 0x07,
26 FW_CFG_KERNEL_SIZE = 0x08,
27 FW_CFG_KERNEL_CMDLINE = 0x09,
28 FW_CFG_INITRD_ADDR = 0x0a,
29 FW_CFG_INITRD_SIZE = 0x0b,
30 FW_CFG_BOOT_DEVICE = 0x0c,
32 FW_CFG_BOOT_MENU = 0x0e,
33 FW_CFG_MAX_CPUS = 0x0f,
34 FW_CFG_KERNEL_ENTRY = 0x10,
35 FW_CFG_KERNEL_DATA = 0x11,
36 FW_CFG_INITRD_DATA = 0x12,
37 FW_CFG_CMDLINE_ADDR = 0x13,
38 FW_CFG_CMDLINE_SIZE = 0x14,
39 FW_CFG_CMDLINE_DATA = 0x15,
40 FW_CFG_SETUP_ADDR = 0x16,
41 FW_CFG_SETUP_SIZE = 0x17,
42 FW_CFG_SETUP_DATA = 0x18,
43 FW_CFG_FILE_DIR = 0x19,
44 FW_CFG_FILE_FIRST = 0x20,
45 FW_CFG_WRITE_CHANNEL = 0x4000,
46 FW_CFG_ARCH_LOCAL = 0x8000,
47 FW_CFG_INVALID = 0xffff,
51 BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
52 BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
53 BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
57 BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
58 BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
61 #define FW_CFG_FILE_SLOTS 0x10
62 #define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
63 #define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
65 #define FW_CFG_MAX_FILE_PATH 56
66 #define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
68 #define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
70 #define FW_CFG_DMA_ERROR (1 << 0)
71 #define FW_CFG_DMA_READ (1 << 1)
72 #define FW_CFG_DMA_SKIP (1 << 2)
73 #define FW_CFG_DMA_SELECT (1 << 3)
75 #define FW_CFG_DMA_ENABLED (1 << 1)
81 char name[FW_CFG_MAX_FILE_PATH];
85 struct fw_cfg_file cfg; /* firmware file information */
86 unsigned long addr; /* firmware file in-memory address */
87 struct list_head list; /* list node to link to fw_list */
90 struct fw_cfg_dma_access {
96 struct bios_linker_entry {
100 * COMMAND_ALLOCATE - allocate a table from @alloc.file
101 * subject to @alloc.align alignment (must be power of 2)
102 * and @alloc.zone (can be HIGH or FSEG) requirements.
104 * Must appear exactly once for each file, and before
105 * this file is referenced by any other command.
108 char file[BIOS_LINKER_LOADER_FILESZ];
114 * COMMAND_ADD_POINTER - patch the table (originating from
115 * @dest_file) at @pointer.offset, by adding a pointer to the
116 * table originating from @src_file. 1,2,4 or 8 byte unsigned
117 * addition is used depending on @pointer.size.
120 char dest_file[BIOS_LINKER_LOADER_FILESZ];
121 char src_file[BIOS_LINKER_LOADER_FILESZ];
127 * COMMAND_ADD_CHECKSUM - calculate checksum of the range
128 * specified by @cksum_start and @cksum_length fields,
129 * and then add the value at @cksum.offset.
130 * Checksum simply sums -X for each byte X in the range
134 char file[BIOS_LINKER_LOADER_FILESZ];
146 * Initialize QEMU fw_cfg interface
148 void qemu_fwcfg_init(void);
151 * Get system cpu number
153 * @return: cpu number in system
155 int qemu_fwcfg_online_cpus(void);