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https://github.com/AsahiLinux/m1n1
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Briefly document protocol
Signed-off-by: Andrew Worsley <amworsley@gmail.com>
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3 changed files with 26 additions and 1 deletions
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@ -80,6 +80,20 @@ ExcInfo = Struct(
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"sp_phys" / Int64ul,
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"data" / Int64ul,
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)
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# Sends 56+ byte Commands and Expects 36 Byte Responses
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# Commands are format <I48sI
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# 4 byte command, 48 byte null padded data + 4 byte checksum
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# Responses are of the format: struct format <Ii24sI
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# 4byte Response , 4 byte status, 24 byte string, 4 byte Checksum
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# Response must start 0xff55aaXX where XX distiguishes between them
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# In little endian mode these numbers as listed as REQ_* constants
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# defined under UartInterface
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#
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# Event Response REQ_EVENT passed to registered Event Handler
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# Boot Response REQ_BOOT passed to handle_boot() which may
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# pass to a matching registered handler based on reason, code values
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# If the status is ST_OK returns the data field to caller
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# Otherwise reports a remote Error
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class UartInterface(Reloadable):
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REQ_NOP = 0x00AA55FF
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@ -426,6 +440,8 @@ REGION_RWX_EL0 = 0x8000000000
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REGION_RW_EL0 = 0x9000000000
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REGION_RX_EL1 = 0xa000000000
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# Uses UartInterface.proxyreq() to send requests to M1N1 and process
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# reponses sent back.
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class M1N1Proxy(Reloadable):
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S_OK = 0
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S_BADCMD = -1
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@ -8,11 +8,18 @@ from .sysreg import *
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from .tgtypes import *
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from .utils import *
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# Create serial connection
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iface = UartInterface()
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# Construct m1n1 proxy layer over serial connection
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p = M1N1Proxy(iface, debug=False)
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# Customise parameters of proxy and serial port
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# based on information sent over the connection
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bootstrap_port(iface, p)
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# Initialise the Proxy interface from values fetched from
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# the remote end
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u = ProxyUtils(p)
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# Build a Register Monitoring object on Proxy Interface
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mon = RegMonitor(u)
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hv = HV(iface, p, u)
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@ -46,7 +46,9 @@ class HistoryConsole(code.InteractiveConsole):
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class ExitConsole(SystemExit):
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pass
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# locals is a dictionary for constructing the
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# InteractiveConsole with. It adds in the callables
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# in proxy utils iface and sysreg into locals
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def run_shell(locals, msg=None, exitmsg=None):
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saved_display = sys.displayhook
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try:
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