1/*
2 * Copyright (c) 2013 Andreas Sandberg
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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44
45namespace GenericISA
46{
47 /** @{ */
48 /**
49 * Memory requests with the MMAPPED_IPR flag are generally mapped
50 * to registers. There is a class of these registers that are
51 * internal to gem5, for example gem5 pseudo-ops in virtualized
52 * mode. Such IPRs always have the flag GENERIC_IPR set and are
53 * handled by this code.
54 */
55
56 /** Shift amount when extracting the class of a generic IPR */
57 const int IPR_CLASS_SHIFT = 48;
58
59 /** Mask to extract the offset in within a generic IPR class */
60 const Addr IPR_IN_CLASS_MASK = ULL(0x0000FFFFFFFFFFFF);
61
62 /** gem5 pseudo-inst emulation.
63 *
64 * Read and writes to this class execute gem5
65 * pseudo-instructions. A write discards the return value of the

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78 *
79 * @param func Function ID to call.
80 * @param subfunc Sub-function, usually 0.
81 * @return Address in the IPR space corresponding to the call.
82 */
83 inline Addr
84 iprAddressPseudoInst(uint8_t func, uint8_t subfunc)
85 {
86 return (IPR_CLASS_PSEUDO_INST << IPR_CLASS_SHIFT) |
87 (func << 8) | subfunc;
88 }
89
90 /**
91 * Check if this is an platform independent IPR access
92 *
93 * Accesses to internal platform independent gem5 registers are
94 * handled by handleGenericIprRead() and
95 * handleGenericIprWrite(). This method determines if a packet
96 * should be routed to those functions instead of the platform
97 * specific code.
98 *
99 * @see handleGenericIprRead
100 * @see handleGenericIprWrite
101 */
102 inline bool
103 isGenericIprAccess(const Packet *pkt)
104 {
105 Request::Flags flags(pkt->req->getFlags());
106 return (flags & Request::MMAPPED_IPR) &&
107 (flags & Request::GENERIC_IPR);
108 }
109
110 /**
111 * Handle generic IPR reads
112 *
113 * @param xc Thread context of the current thread.
114 * @param pkt Packet from the CPU
115 * @return Latency in CPU cycles

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