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typedef struct __attribute__((packed))
{
    u32_t           sig;
    u32_t           len;
    u8_t            rev;
    u8_t            csum;
    char            oem_id[ACPI_OEM_ID_SIZE];
    char            oem_tid[ACPI_OEM_TABLE_ID_SIZE];
    u32_t           oem_rev;
    u32_t           creator_id;
    u32_t           creator_rev;
}acpi_thead_t;

typedef struct __attribute__((packed)){
    acpi_thead_t    Header;             /* Common ACPI table header */
    u32_t           Facs;               /* 32-bit physical address of FACS */
    u32_t           Dsdt;               /* 32-bit physical address of DSDT */
    u8_t            Model;              /* System Interrupt Model (ACPI 1.0) - not used in ACPI 2.0+ */
    u8_t            PreferredProfile;   /* Conveys preferred power management profile to OSPM. */
    u16_t           SciInterrupt;       /* System vector of SCI interrupt */
    u32_t           SmiCommand;         /* 32-bit Port address of SMI command port */
    u8_t            AcpiEnable;         /* Value to write to smi_cmd to enable ACPI */
    u8_t            AcpiDisable;        /* Value to write to smi_cmd to disable ACPI */
    u8_t            S4BiosRequest;      /* Value to write to SMI CMD to enter S4BIOS state */
    u8_t            PstateControl;      /* Processor performance state control*/
    u32_t           Pm1aEventBlock;     /* 32-bit Port address of Power Mgt 1a Event Reg Blk */
    u32_t           Pm1bEventBlock;     /* 32-bit Port address of Power Mgt 1b Event Reg Blk */
    u32_t           Pm1aControlBlock;   /* 32-bit Port address of Power Mgt 1a Control Reg Blk */
    u32_t           Pm1bControlBlock;   /* 32-bit Port address of Power Mgt 1b Control Reg Blk */
    u32_t           Pm2ControlBlock;    /* 32-bit Port address of Power Mgt 2 Control Reg Blk */
    u32_t           PmTimerBlock;       /* 32-bit Port address of Power Mgt Timer Ctrl Reg Blk */
    u32_t           Gpe0Block;          /* 32-bit Port address of General Purpose Event 0 Reg Blk */
    u32_t           Gpe1Block;          /* 32-bit Port address of General Purpose Event 1 Reg Blk */
    u8_t            Pm1EventLength;     /* Byte Length of ports at Pm1xEventBlock */
    u8_t            Pm1ControlLength;   /* Byte Length of ports at Pm1xControlBlock */
    u8_t            Pm2ControlLength;   /* Byte Length of ports at Pm2ControlBlock */
    u8_t            PmTimerLength;      /* Byte Length of ports at PmTimerBlock */
    u8_t            Gpe0BlockLength;    /* Byte Length of ports at Gpe0Block */
    u8_t            Gpe1BlockLength;    /* Byte Length of ports at Gpe1Block */
    u8_t            Gpe1Base;           /* Offset in GPE number space where GPE1 events start */
    u8_t            CstControl;         /* Support for the _CST object and C States change notification */
    u16_t           C2Latency;          /* Worst case HW latency to enter/exit C2 state */
    u16_t           C3Latency;          /* Worst case HW latency to enter/exit C3 state */
    u16_t           FlushSize;          /* Processor's memory cache line width, in bytes */
    u16_t           FlushStride;        /* Number of flush strides that need to be read */
    u8_t            DutyOffset;         /* Processor duty cycle index in processor's P_CNT reg*/
    u8_t            DutyWidth;          /* Processor duty cycle value bit width in P_CNT register.*/
    u8_t            DayAlarm;           /* Index to day-of-month alarm in RTC CMOS RAM */
    u8_t            MonthAlarm;         /* Index to month-of-year alarm in RTC CMOS RAM */
    u8_t            Century;            /* Index to century in RTC CMOS RAM */
    u16_t           BootFlags;          /* IA-PC Boot Architecture Flags. See Table 5-10 for description */
    u8_t            Reserved;           /* Reserved, must be zero */
    u32_t           Flags;              /* Miscellaneous flag bits (see below for individual flags) */
    acpi_address_t  ResetRegister;      /* 64-bit address of the Reset register */
    u8_t            ResetValue;         /* Value to write to the ResetRegister port to reset the system */
    u8_t            Reserved4[3];       /* Reserved, must be zero */
    u64_t           XFacs;              /* 64-bit physical address of FACS */
    u64_t           XDsdt;              /* 64-bit physical address of DSDT */
    acpi_address_t  XPm1aEventBlock;    /* 64-bit Extended Power Mgt 1a Event Reg Blk address */
    acpi_address_t  XPm1bEventBlock;    /* 64-bit Extended Power Mgt 1b Event Reg Blk address */
    acpi_address_t  XPm1aControlBlock;  /* 64-bit Extended Power Mgt 1a Control Reg Blk address */
    acpi_address_t  XPm1bControlBlock;  /* 64-bit Extended Power Mgt 1b Control Reg Blk address */
    acpi_address_t  XPm2ControlBlock;   /* 64-bit Extended Power Mgt 2 Control Reg Blk address */
    acpi_address_t  XPmTimerBlock;      /* 64-bit Extended Power Mgt Timer Ctrl Reg Blk address */
    acpi_address_t  XGpe0Block;         /* 64-bit Extended General Purpose Event 0 Reg Blk address */
    acpi_address_t  XGpe1Block;         /* 64-bit Extended General Purpose Event 1 Reg Blk address */
} acpi_fadt_t;

static void dump_fadt(acpi_fadt_t *fadt)
{

    printf("FACS base: %x DSDT base: %x\n", fadt->Facs, fadt->Dsdt);

    u8_t p = fadt->PreferredProfile;
    printf("PreferredProfile: %s\n" ,
            p == 0 ? "Unspecified"  :
            p == 1 ? "Desktop"      :
            p == 2 ? "Mobile"       :
            p == 3 ? "Workstation"  :
            p == 4 ? "Enterprise Server" :
            p == 5 ? "SOHO Server"  :
            p == 6 ? "Appliance PC" : "Unknown");

    printf("SciInterrupt:   %d\n"
           "SmiCommand:     %x\n"
           "AcpiEnable:     %x\n"
           "AcpiDisable:    %x\n"
           "S4BiosRequest:  %x\n"
           "PstateControl:  %x\n"
           "Pm1aEventBlock: %x\n"
           "Pm1bEventBlock: %x\n\n",
           fadt->SciInterrupt,
           fadt->SmiCommand,
           fadt->AcpiDisable,
           fadt->S4BiosRequest,
           fadt->PstateControl,
           fadt->Pm1aEventBlock,
           fadt->Pm1bEventBlock);
};

        fadt = (acpi_fadt_t*)rsdt_find(rsdt, 0x50434146);