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x86: qemu: Move qfw command over to cmd and add Kconfig entry
[karo-tx-uboot.git] / include / qemu_fw_cfg.h
1 /*
2  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #ifndef __FW_CFG__
8 #define __FW_CFG__
9
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
14
15 #include <linux/list.h>
16
17 enum qemu_fwcfg_items {
18         FW_CFG_SIGNATURE        = 0x00,
19         FW_CFG_ID               = 0x01,
20         FW_CFG_UUID             = 0x02,
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,
31         FW_CFG_NUMA             = 0x0d,
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,
48 };
49
50 enum {
51         BIOS_LINKER_LOADER_COMMAND_ALLOCATE     = 0x1,
52         BIOS_LINKER_LOADER_COMMAND_ADD_POINTER  = 0x2,
53         BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
54 };
55
56 enum {
57         BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
58         BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
59 };
60
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)
64
65 #define FW_CFG_MAX_FILE_PATH    56
66 #define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
67
68 #define QEMU_FW_CFG_SIGNATURE   (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
69
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)
74
75 #define FW_CFG_DMA_ENABLED      (1 << 1)
76
77 struct fw_cfg_file {
78         __be32 size;
79         __be16 select;
80         __be16 reserved;
81         char name[FW_CFG_MAX_FILE_PATH];
82 };
83
84 struct fw_file {
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 */
88 };
89
90 struct fw_cfg_dma_access {
91         __be32 control;
92         __be32 length;
93         __be64 address;
94 };
95
96 struct bios_linker_entry {
97         __le32 command;
98         union {
99                 /*
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.
103                  *
104                  * Must appear exactly once for each file, and before
105                  * this file is referenced by any other command.
106                  */
107                 struct {
108                         char file[BIOS_LINKER_LOADER_FILESZ];
109                         __le32 align;
110                         uint8_t zone;
111                 } alloc;
112
113                 /*
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.
118                  */
119                 struct {
120                         char dest_file[BIOS_LINKER_LOADER_FILESZ];
121                         char src_file[BIOS_LINKER_LOADER_FILESZ];
122                         __le32 offset;
123                         uint8_t size;
124                 } pointer;
125
126                 /*
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
131                  * using 8-bit math.
132                  */
133                 struct {
134                         char file[BIOS_LINKER_LOADER_FILESZ];
135                         __le32 offset;
136                         __le32 start;
137                         __le32 length;
138                 } cksum;
139
140                 /* padding */
141                 char pad[124];
142         };
143 } __packed;
144
145 /**
146  * Initialize QEMU fw_cfg interface
147  */
148 void qemu_fwcfg_init(void);
149
150 void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
151 int qemu_fwcfg_read_firmware_list(void);
152 struct fw_file *qemu_fwcfg_find_file(const char *name);
153 void qemu_fwcfg_free_files(void);
154
155 /**
156  * Get system cpu number
157  *
158  * @return:   cpu number in system
159  */
160 int qemu_fwcfg_online_cpus(void);
161
162 #endif