FreeBSD/Linux Kernel Cross Reference
sys/Documentation/dcdbas.txt

     Overview
     
     The Dell Systems Management Base Driver provides a sysfs interface for
     systems management software such as Dell OpenManage to perform system
     management interrupts and host control actions (system power cycle or
     power off after OS shutdown) on certain Dell systems.
     
     Dell OpenManage requires this driver on the following Dell PowerEdge systems:
     300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
    700, and 750.  Other Dell software such as the open source libsmbios project
    is expected to make use of this driver, and it may include the use of this
    driver on other Dell systems.
    
    The Dell libsmbios project aims towards providing access to as much BIOS
    information as possible.  See http://linux.dell.com/libsmbios/main/ for
    more information about the libsmbios project.
    
    
    System Management Interrupt
    
    On some Dell systems, systems management software must access certain
    management information via a system management interrupt (SMI).  The SMI data
    buffer must reside in 32-bit address space, and the physical address of the
    buffer is required for the SMI.  The driver maintains the memory required for
    the SMI and provides a way for the application to generate the SMI.
    The driver creates the following sysfs entries for systems management
    software to perform these system management interrupts:
    
    /sys/devices/platform/dcdbas/smi_data
    /sys/devices/platform/dcdbas/smi_data_buf_phys_addr
    /sys/devices/platform/dcdbas/smi_data_buf_size
    /sys/devices/platform/dcdbas/smi_request
    
    Systems management software must perform the following steps to execute
    a SMI using this driver:
    
    1) Lock smi_data.
    2) Write system management command to smi_data.
    3) Write "1" to smi_request to generate a calling interface SMI or
       "2" to generate a raw SMI.
    4) Read system management command response from smi_data.
    5) Unlock smi_data.
    
    
    Host Control Action
    
    Dell OpenManage supports a host control feature that allows the administrator
    to perform a power cycle or power off of the system after the OS has finished
    shutting down.  On some Dell systems, this host control feature requires that
    a driver perform a SMI after the OS has finished shutting down.
    
    The driver creates the following sysfs entries for systems management software
    to schedule the driver to perform a power cycle or power off host control
    action after the system has finished shutting down:
    
    /sys/devices/platform/dcdbas/host_control_action
    /sys/devices/platform/dcdbas/host_control_smi_type
    /sys/devices/platform/dcdbas/host_control_on_shutdown
    
    Dell OpenManage performs the following steps to execute a power cycle or
    power off host control action using this driver:
    
    1) Write host control action to be performed to host_control_action.
    2) Write type of SMI that driver needs to perform to host_control_smi_type.
    3) Write "1" to host_control_on_shutdown to enable host control action.
    4) Initiate OS shutdown.
       (Driver will perform host control SMI when it is notified that the OS
       has finished shutting down.)
    
    
    Host Control SMI Type
    
    The following table shows the value to write to host_control_smi_type to
    perform a power cycle or power off host control action:
    
    PowerEdge System    Host Control SMI Type
    ----------------    ---------------------
          300             HC_SMITYPE_TYPE1
         1300             HC_SMITYPE_TYPE1
         1400             HC_SMITYPE_TYPE2
          500SC           HC_SMITYPE_TYPE2
         1500SC           HC_SMITYPE_TYPE2
         1550             HC_SMITYPE_TYPE2
          600SC           HC_SMITYPE_TYPE2
         1600SC           HC_SMITYPE_TYPE2
          650             HC_SMITYPE_TYPE2
         1655MC           HC_SMITYPE_TYPE2
          700             HC_SMITYPE_TYPE3
          750             HC_SMITYPE_TYPE3
    
    

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