include/qfw.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
   4  */
   5
   6 #ifndef __FW_CFG__
   7 #define __FW_CFG__
   8
   9 #include <linux/list.h>
  10
  11 enum qemu_fwcfg_items {
  12         FW_CFG_SIGNATURE        = 0x00,
  13         FW_CFG_ID               = 0x01,
  14         FW_CFG_UUID             = 0x02,
  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,
  25         FW_CFG_NUMA             = 0x0d,
  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,
  42 };
  43
  44 enum {
  45         BIOS_LINKER_LOADER_COMMAND_ALLOCATE     = 0x1,
  46         BIOS_LINKER_LOADER_COMMAND_ADD_POINTER  = 0x2,
  47         BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
  48 };
  49
  50 enum {
  51         BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
  52         BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
  53 };
  54
  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)
  58
  59 #define FW_CFG_MAX_FILE_PATH    56
  60 #define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
  61
  62 #define QEMU_FW_CFG_SIGNATURE   (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
  63
  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)
  68
  69 #define FW_CFG_DMA_ENABLED      (1 << 1)
  70
  71 struct fw_cfg_file {
  72         __be32 size;
  73         __be16 select;
  74         __be16 reserved;
  75         char name[FW_CFG_MAX_FILE_PATH];
  76 };
  77
  78 struct fw_file {
  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 */
  82 };
  83
  84 struct fw_cfg_file_iter {
  85         struct list_head *entry; /* structure to iterate file list */
  86 };
  87
  88 struct fw_cfg_dma_access {
  89         __be32 control;
  90         __be32 length;
  91         __be64 address;
  92 };
  93
  94 struct fw_cfg_arch_ops {
  95         void (*arch_read_pio)(uint16_t selector, uint32_t size,
  96                         void *address);
  97         void (*arch_read_dma)(struct fw_cfg_dma_access *dma);
  98 };
  99
 100 struct bios_linker_entry {
 101         __le32 command;
 102         union {
 103                 /*
 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.
 107                  *
 108                  * Must appear exactly once for each file, and before
 109                  * this file is referenced by any other command.
 110                  */
 111                 struct {
 112                         char file[BIOS_LINKER_LOADER_FILESZ];
 113                         __le32 align;
 114                         uint8_t zone;
 115                 } alloc;
 116
 117                 /*
 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.
 122                  */
 123                 struct {
 124                         char dest_file[BIOS_LINKER_LOADER_FILESZ];
 125                         char src_file[BIOS_LINKER_LOADER_FILESZ];
 126                         __le32 offset;
 127                         uint8_t size;
 128                 } pointer;
 129
 130                 /*
 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
 135                  * using 8-bit math.
 136                  */
 137                 struct {
 138                         char file[BIOS_LINKER_LOADER_FILESZ];
 139                         __le32 offset;
 140                         __le32 start;
 141                         __le32 length;
 142                 } cksum;
 143
 144                 /* padding */
 145                 char pad[124];
 146         };
 147 } __packed;
 148
 149 /**
 150  * Initialize QEMU fw_cfg interface
 151  *
 152  * @ops: arch specific read operations
 153  */
 154 void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops);
 155
 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);
 159
 160 /**
 161  * Get system cpu number
 162  *
 163  * @return:   cpu number in system
 164  */
 165 int qemu_fwcfg_online_cpus(void);
 166
 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);
 171
 172 bool qemu_fwcfg_present(void);
 173 bool qemu_fwcfg_dma_present(void);
 174
 175 #endif