sdei.txt

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    1 * Software Delegated Exception Interface (SDEI)
    2 
    3 Firmware implementing the SDEI functions described in ARM document number
    4 ARM DEN 0054A ("Software Delegated Exception Interface") can be used by
    5 Linux to receive notification of events such as those generated by
    6 firmware-first error handling, or from an IRQ that has been promoted to
    7 a firmware-assisted NMI.
    8 
    9 The interface provides a number of API functions for registering callbacks
   10 and enabling/disabling events. Functions are invoked by trapping to the
   11 privilege level of the SDEI firmware (specified as part of the binding
   12 below) and passing arguments in a manner specified by the "SMC Calling
   13 Convention (ARM DEN 0028B):
   14 
   15          r0             => 32-bit Function ID / return value
   16         {r1 - r3}       => Parameters
   17 
   18 Note that the immediate field of the trapping instruction must be set
   19 to #0.
   20 
   21 The SDEI_EVENT_REGISTER function registers a callback in the kernel
   22 text to handle the specified event number.
   23 
   24 The sdei node should be a child node of '/firmware' and have required
   25 properties:
   26 
   27  - compatible    : should contain:
   28         * "arm,sdei-1.0" : For implementations complying to SDEI version 1.x.
   29 
   30  - method        : The method of calling the SDEI firmware. Permitted
   31                    values are:
   32         * "smc" : SMC #0, with the register assignments specified in this
   33                   binding.
   34         * "hvc" : HVC #0, with the register assignments specified in this
   35                   binding.
   36 Example:
   37         firmware {
   38                 sdei {
   39                         compatible      = "arm,sdei-1.0";
   40                         method          = "smc";
   41                 };
   42         };

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sys/contrib/device-tree/Bindings/arm/firmware/sdei.txt