U-Boot学习：[0]global_data 和 bd_info

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U-Boot学习：[0]global_data 和 bd_info

基于U-Boot 2017.03-rc2-gc7a25b3-dirty 源码分析

global_data

global_data 数据结构

global_data 数据结构的定义位于源码目录：

include/asm-generic/global_data.h

typedef struct global_data {    bd_t *bd;       //struct board_info指针，保存板子信息    unsigned long flags;        //指示标志，如设备已经初始化标志等    unsigned int baudrate;       //串口波特率    unsigned long cpu_clk;      /* CPU clock in Hz!     */    unsigned long bus_clk;    /* We cannot bracket this with CONFIG_PCI due to mpc5xxx */    unsigned long pci_clk;    unsigned long mem_clk;#if defined(CONFIG_LCD) || defined(CONFIG_VIDEO)    unsigned long fb_base;      /* Base address of framebuffer mem frame buffer的基址 */#endif#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)    unsigned long post_log_word;    /* Record POST activities */    unsigned long post_log_res; /* success of POST test */    unsigned long post_init_f_time; /* When post_init_f started */#endif#ifdef CONFIG_BOARD_TYPES    unsigned long board_type;#endif    unsigned long have_console; /* serial_init() was called 串口初始化标志 */#if CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)    unsigned long precon_buf_idx;   /* Pre-Console buffer index */#endif    unsigned long env_addr;     /* Address  of Environment struct 环境参数地址 */    unsigned long env_valid;    /* Checksum of Environment valid? 环境参数CRC检验有效标志 */    unsigned long ram_top;      /* Top address of RAM used by U-Boot */    unsigned long relocaddr;    /* Start address of U-Boot in RAM */    phys_size_t ram_size;       /* RAM size */    unsigned long mon_len;      /* monitor len */    unsigned long irq_sp;       /* irq stack pointer */    unsigned long start_addr_sp;    /* start_addr_stackpointer */    unsigned long reloc_off;    struct global_data *new_gd; /* relocated global data */#ifdef CONFIG_DM    struct udevice  *dm_root;   /* Root instance for Driver Model */    struct udevice  *dm_root_f; /* Pre-relocation root instance */    struct list_head uclass_root;   /* Head of core tree */#endif#ifdef CONFIG_TIMER    struct udevice  *timer;     /* Timer instance for Driver Model */#endif    const void *fdt_blob;       /* Our device tree, NULL if none */    void *new_fdt;          /* Relocated FDT */    unsigned long fdt_size;     /* Space reserved for relocated FDT */    struct jt_funcs *jt;        /* jump table 跳转表，用来"函数调用地址登记" */    char env_buf[32];       /* buffer for getenv() before reloc. */#ifdef CONFIG_TRACE    void        *trace_buff;    /* The trace buffer */#endif#if defined(CONFIG_SYS_I2C)    int     cur_i2c_bus;    /* current used i2c bus */#endif#ifdef CONFIG_SYS_I2C_MXC    void *srdata[10];#endif    unsigned long timebase_h;    unsigned long timebase_l;#ifdef CONFIG_SYS_MALLOC_F_LEN    unsigned long malloc_base;  /* base address of early malloc() */    unsigned long malloc_limit; /* limit address */    unsigned long malloc_ptr;   /* current address */#endif#ifdef CONFIG_PCI    struct pci_controller *hose;    /* PCI hose for early use */    phys_addr_t pci_ram_top;    /* top of region accessible to PCI */#endif#ifdef CONFIG_PCI_BOOTDELAY    int pcidelay_done;#endif    struct udevice *cur_serial_dev; /* current serial device */    struct arch_global_data arch;   /* architecture-specific data */#ifdef CONFIG_CONSOLE_RECORD    struct membuff console_out; /* console output */    struct membuff console_in;  /* console input */#endif#ifdef CONFIG_DM_VIDEO    ulong video_top;        /* Top of video frame buffer area */    ulong video_bottom;     /* Bottom of video frame buffer area */#endif} gd_t;

global_data 声明

对于ARM架构，其 struct arch_global_data 定义位于源码目录：

arch/arm/include/asm/global_data.h:

/* Architecture-specific global data */struct arch_global_data {#if defined(CONFIG_FSL_ESDHC)    u32 sdhc_clk;#endif#if defined(CONFIG_U_QE)    u32 qe_clk;    u32 brg_clk;    uint mp_alloc_base;    uint mp_alloc_top;#endif /* CONFIG_U_QE */#ifdef CONFIG_AT91FAMILY    /* "static data" needed by at91's clock.c */    unsigned long   cpu_clk_rate_hz;    unsigned long   main_clk_rate_hz;    unsigned long   mck_rate_hz;    unsigned long   plla_rate_hz;    unsigned long   pllb_rate_hz;    unsigned long   at91_pllb_usb_init;#endif    /* "static data" needed by most of timer.c on ARM platforms */    unsigned long timer_rate_hz;    unsigned long tbu;    unsigned long tbl;    unsigned long lastinc;    unsigned long long timer_reset_value;#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))    unsigned long tlb_addr;    unsigned long tlb_size;#if defined(CONFIG_ARM64)    unsigned long tlb_fillptr;    unsigned long tlb_emerg;#endif#endif#ifdef CONFIG_SYS_MEM_RESERVE_SECURE#define MEM_RESERVE_SECURE_SECURED  0x1#define MEM_RESERVE_SECURE_MAINTAINED   0x2#define MEM_RESERVE_SECURE_ADDR_MASK    (~0x3)    /*     * Secure memory addr     * This variable needs maintenance if the RAM base is not zero,     * or if RAM splits into non-consecutive banks. It also has a     * flag indicating the secure memory is marked as secure by MMU.     * Flags used: 0x1 secured     *             0x2 maintained     */    phys_addr_t secure_ram;    unsigned long tlb_allocated;#endif#ifdef CONFIG_ARCH_OMAP2    u32 omap_boot_device;    u32 omap_boot_mode;    u8 omap_ch_flags;#endif#if defined(CONFIG_FSL_LSCH3) && defined(CONFIG_SYS_FSL_HAS_DP_DDR)    unsigned long mem2_clk;#endif};

#ifdef CONFIG_ARM64#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("x18")#else#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r9")#endif#endif

当使用gd_t时需用宏定义进行声明：DECLARE_GLOBAL_DATA_PTR。

对于ARM架构指定占用寄存器r9；对于ARM64架构制定占用寄存器x18。

bd_info

bd_info 数据结构

bd_info 数据结构的定义位于源码目录：

include/asm-generic/u-boot.h

typedef struct bd_info {    unsigned long   bi_memstart;    /* start of DRAM memory */    phys_size_t bi_memsize; /* size  of DRAM memory in bytes */    unsigned long   bi_flashstart;  /* start of FLASH memory */    unsigned long   bi_flashsize;   /* size  of FLASH memory */    unsigned long   bi_flashoffset; /* reserved area for startup monitor */    unsigned long   bi_sramstart;   /* start of SRAM memory */    unsigned long   bi_sramsize;    /* size  of SRAM memory */#ifdef CONFIG_AVR32    unsigned char   bi_phy_id[4];   /* PHY address for ATAG_ETHERNET */    unsigned long   bi_board_number;/* ATAG_BOARDINFO */#endif#ifdef CONFIG_ARM    unsigned long   bi_arm_freq; /* arm frequency */    unsigned long   bi_dsp_freq; /* dsp core frequency */    unsigned long   bi_ddr_freq; /* ddr frequency */#endif#if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_MPC8260) \    || defined(CONFIG_E500) || defined(CONFIG_MPC86xx)    unsigned long   bi_immr_base;   /* base of IMMR register */#endif#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)    unsigned long   bi_mbar_base;   /* base of internal registers */#endif#if defined(CONFIG_MPC83xx)    unsigned long   bi_immrbar;#endif    unsigned long   bi_bootflags;   /* boot / reboot flag (Unused) */    unsigned long   bi_ip_addr; /* IP Address */    unsigned char   bi_enetaddr[6]; /* OLD: see README.enetaddr */    unsigned short  bi_ethspeed;    /* Ethernet speed in Mbps */    unsigned long   bi_intfreq; /* Internal Freq, in MHz */    unsigned long   bi_busfreq; /* Bus Freq, in MHz */#if defined(CONFIG_CPM2)    unsigned long   bi_cpmfreq; /* CPM_CLK Freq, in MHz */    unsigned long   bi_brgfreq; /* BRG_CLK Freq, in MHz */    unsigned long   bi_sccfreq; /* SCC_CLK Freq, in MHz */    unsigned long   bi_vco;     /* VCO Out from PLL, in MHz */#endif#if defined(CONFIG_MPC512X)    unsigned long   bi_ipsfreq; /* IPS Bus Freq, in MHz */#endif /* CONFIG_MPC512X */#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)    unsigned long   bi_ipbfreq; /* IPB Bus Freq, in MHz */    unsigned long   bi_pcifreq; /* PCI Bus Freq, in MHz */#endif#if defined(CONFIG_EXTRA_CLOCK)    unsigned long bi_inpfreq;   /* input Freq in MHz */    unsigned long bi_vcofreq;   /* vco Freq in MHz */    unsigned long bi_flbfreq;   /* Flexbus Freq in MHz */#endif#if defined(CONFIG_405)   || \        defined(CONFIG_405GP) || \        defined(CONFIG_405EP) || \        defined(CONFIG_405EZ) || \        defined(CONFIG_405EX) || \        defined(CONFIG_440)    unsigned char   bi_s_version[4];    /* Version of this structure */    unsigned char   bi_r_version[32];   /* Version of the ROM (AMCC) */    unsigned int    bi_procfreq;    /* CPU (Internal) Freq, in Hz */    unsigned int    bi_plb_busfreq; /* PLB Bus speed, in Hz */    unsigned int    bi_pci_busfreq; /* PCI Bus speed, in Hz */    unsigned char   bi_pci_enetaddr[6]; /* PCI Ethernet MAC address */#endif#ifdef CONFIG_HAS_ETH1    unsigned char   bi_enet1addr[6];    /* OLD: see README.enetaddr */#endif#ifdef CONFIG_HAS_ETH2    unsigned char   bi_enet2addr[6];    /* OLD: see README.enetaddr */#endif#ifdef CONFIG_HAS_ETH3    unsigned char   bi_enet3addr[6];    /* OLD: see README.enetaddr */#endif#ifdef CONFIG_HAS_ETH4    unsigned char   bi_enet4addr[6];    /* OLD: see README.enetaddr */#endif#ifdef CONFIG_HAS_ETH5    unsigned char   bi_enet5addr[6];    /* OLD: see README.enetaddr */#endif#if defined(CONFIG_405GP) || defined(CONFIG_405EP) || \        defined(CONFIG_405EZ) || defined(CONFIG_440GX) || \        defined(CONFIG_440EP) || defined(CONFIG_440GR) || \        defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \        defined(CONFIG_460EX) || defined(CONFIG_460GT)    unsigned int    bi_opbfreq;     /* OPB clock in Hz */    int     bi_iic_fast[2];     /* Use fast i2c mode */#endif#if defined(CONFIG_4xx)#if defined(CONFIG_440GX) || \        defined(CONFIG_460EX) || defined(CONFIG_460GT)    int     bi_phynum[4];           /* Determines phy mapping */    int     bi_phymode[4];          /* Determines phy mode */#elif defined(CONFIG_405EP) || defined(CONFIG_405EX) || defined(CONFIG_440)    int     bi_phynum[2];           /* Determines phy mapping */    int     bi_phymode[2];          /* Determines phy mode */#else    int     bi_phynum[1];           /* Determines phy mapping */    int     bi_phymode[1];          /* Determines phy mode */#endif#endif /* defined(CONFIG_4xx) */    ulong           bi_arch_number; /* unique id for this board */    ulong           bi_boot_params; /* where this board expects params */#ifdef CONFIG_NR_DRAM_BANKS    struct {            /* RAM configuration */        phys_addr_t start;        phys_size_t size;    } bi_dram[CONFIG_NR_DRAM_BANKS];#endif /* CONFIG_NR_DRAM_BANKS */} bd_t;

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