75 lines
1.6 KiB
Python
75 lines
1.6 KiB
Python
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from migen.fhdl.std import *
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from migen.genlib.record import *
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from migen.flow.actor import *
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KB = 1024
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MB = 1024*KB
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GB = 1024*MB
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def get_bar_mask(size):
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mask = 0
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found = 0
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for i in range(32):
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if size%2:
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found = 1
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if found:
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mask |= (1 << i)
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size = size >> 1
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return mask
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def reverse_bytes(v):
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return Cat(v[24:32], v[16:24], v[8:16], v[0:8])
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def reverse_bits(v):
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return Cat(v[3], v[2], v[1], v[0])
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def phy_layout(dw):
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layout = [
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("dat", dw),
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("be", dw//8)
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]
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return EndpointDescription(layout, packetized=True)
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def request_layout(dw):
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layout = [
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("we", 1),
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("adr", 32),
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("len", 10),
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("req_id", 16),
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("tag", 8),
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("dat", dw),
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("channel", 8), # for routing
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("user_id", 8) # for packet identification
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]
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return EndpointDescription(layout, packetized=True)
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def completion_layout(dw):
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layout = [
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("adr", 32),
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("len", 10),
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("last", 1),
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("req_id", 16),
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("cmp_id", 16),
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("err", 1),
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("tag", 8),
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("dat", dw),
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("channel", 8), # for routing
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("user_id", 8) # for packet identification
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]
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return EndpointDescription(layout, packetized=True)
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def interrupt_layout():
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return [("dat", 8)]
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def dma_layout(dw):
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layout = [("dat", dw)]
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return EndpointDescription(layout, packetized=True)
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