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from collections import namedtuple
CommandInfo = namedtuple('CommandInfo', ['ptr', 'value', 'op', 'payload_ofs', 'desc', 'state_info'])
StateInfo = namedtuple('StateInfo', ['pos', 'format'])
# Number of words to ignore at start of command buffer
# A PIPE3D command will be inserted here by the kernel if necessary
CMDBUF_IGNORE_INITIAL = 8
def parse_command_buffer(buffer_words):
'''
Parse Vivante command buffer contents, return a sequence of
CommandInfo records.
'''
state_base = 0
state_count = 0
state_format = 0
next_cmd = CMDBUF_IGNORE_INITIAL
payload_start_ptr = 0
payload_end_ptr = 0
op = 0
ptr = 0
for value in buffer_words:
state_info = None
if ptr >= next_cmd:
payload_ofs = -1
op = value >> 27
payload_start_ptr = payload_end_ptr = ptr + 1
if op == 1:
state_base = (value & 0xFFFF)<<2
state_count = (value >> 16) & 0x3FF
if state_count == 0:
state_count = 0x400
state_format = (value >> 26) & 1
payload_end_ptr = payload_start_ptr + state_count
desc = "LOAD_STATE (1) Base: 0x%05X Size: %i Fixp: %i" % (state_base, state_count, state_format)
elif op == 2:
desc = "END (2)"
elif op == 3:
desc = "NOP (3)"
elif op == 4:
desc = "DRAW_2D (4)"
elif op == 5:
desc = "DRAW_PRIMITIVES (5)"
payload_end_ptr = payload_start_ptr + 3
elif op == 6:
desc = "DRAW_INDEXED_PRIMITIVES (6)"
payload_end_ptr = payload_start_ptr + 4
elif op == 7:
desc = "WAIT (7)"
elif op == 8:
desc = "LINK (8)"
payload_end_ptr = payload_start_ptr + 1
elif op == 9:
desc = "STALL (9)"
payload_end_ptr = payload_start_ptr + 1
elif op == 10:
desc = "CALL (10)"
payload_end_ptr = payload_start_ptr + 1
elif op == 11:
desc = "RETURN (11)"
elif op == 13:
desc = "CHIP_SELECT (13)"
else:
desc = "UNKNOWN (%i)" % op
next_cmd = (payload_end_ptr + 1) & (~1)
elif ptr < payload_end_ptr: # Parse payload
payload_ofs = ptr - payload_start_ptr
desc = ""
if op == 1:
pos = payload_ofs*4 + state_base
state_info = StateInfo(pos, state_format)
else:
desc = "PAD"
payload_ofs = -2 # padding
yield CommandInfo(ptr, value, op, payload_ofs, desc, state_info)
ptr += 1
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