romutil.py (5852:1a40b07bbc30) romutil.py (5853:606b9525071d)
1# Copyright (c) 2008 The Regents of The University of Michigan
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright

--- 29 unchanged lines hidden (view full) ---

38 # Get the 64 bit interrupt or trap gate descriptor from the IDT
39 #
40
41 # Load the gate descriptor from the IDT
42 slli t4, t1, 4, dataSize=8
43 ld t2, idtr, [1, t0, t4], 8, dataSize=8, addressSize=8
44 ld t4, idtr, [1, t0, t4], dataSize=8, addressSize=8
45
1# Copyright (c) 2008 The Regents of The University of Michigan
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright

--- 29 unchanged lines hidden (view full) ---

38 # Get the 64 bit interrupt or trap gate descriptor from the IDT
39 #
40
41 # Load the gate descriptor from the IDT
42 slli t4, t1, 4, dataSize=8
43 ld t2, idtr, [1, t0, t4], 8, dataSize=8, addressSize=8
44 ld t4, idtr, [1, t0, t4], dataSize=8, addressSize=8
45
46 # Check permissions
46 # Make sure the descriptor is a legal gate.
47 chks t1, t4, IntGateCheck
48
47 chks t1, t4, IntGateCheck
48
49 mov t1, t1, t4, dataSize=8
50
51 # Check that it's the right type
52 srli t4, t1, 40, dataSize=8
53 andi t4, t4, 0xe, dataSize=8
54 xori t4, t4, 0xe, flags=(EZF,), dataSize=8
55 fault "new GeneralProtection(0)", flags=(nCEZF,)
56
57
58 #
59 # Get the target CS descriptor using the selector in the gate
60 # descriptor.
61 #
62 srli t10, t4, 16, dataSize=8
63 andi t5, t10, 0xF8, dataSize=8
64 andi t0, t10, 0x4, flags=(EZF,), dataSize=2
65 br rom_local_label("globalDescriptor"), flags=(CEZF,)

--- 129 unchanged lines hidden --- 		49 #
50 # Get the target CS descriptor using the selector in the gate
51 # descriptor.
52 #
53 srli t10, t4, 16, dataSize=8
54 andi t5, t10, 0xF8, dataSize=8
55 andi t0, t10, 0x4, flags=(EZF,), dataSize=2
56 br rom_local_label("globalDescriptor"), flags=(CEZF,)

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