mmapped_ipr.hh (9897:e105fbf799e7) | mmapped_ipr.hh (9911:676d3dcf1cc2) |
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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; --- 35 unchanged lines hidden (view full) --- 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 | 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; --- 35 unchanged lines hidden (view full) --- 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. 53 * 54 * In order to make the IPR space manageable we always set bit 63 55 * (IPR_GENERIC) for accesses that should be handled by the 56 * generic ISA code. Architectures may use the rest of the IPR 57 * space internally. | 52 * mode. Such IPRs always have the flag GENERIC_IPR set and are 53 * handled by this code. |
58 */ 59 | 54 */ 55 |
60 /** Is this a generic IPR access? */ 61 const Addr IPR_GENERIC = ULL(0x8000000000000000); 62 63 /** @{ */ 64 /** Mask when extracting the class of a generic IPR */ 65 const Addr IPR_CLASS_MASK = ULL(0x7FFF000000000000); | |
66 /** Shift amount when extracting the class of a generic IPR */ 67 const int IPR_CLASS_SHIFT = 48; | 56 /** Shift amount when extracting the class of a generic IPR */ 57 const int IPR_CLASS_SHIFT = 48; |
68 /** @} */ | |
69 70 /** Mask to extract the offset in within a generic IPR class */ 71 const Addr IPR_IN_CLASS_MASK = ULL(0x0000FFFFFFFFFFFF); 72 73 /** gem5 pseudo-inst emulation. 74 * 75 * Read and writes to this class execute gem5 76 * pseudo-instructions. A write discards the return value of the --- 12 unchanged lines hidden (view full) --- 89 * 90 * @param func Function ID to call. 91 * @param subfunc Sub-function, usually 0. 92 * @return Address in the IPR space corresponding to the call. 93 */ 94 inline Addr 95 iprAddressPseudoInst(uint8_t func, uint8_t subfunc) 96 { | 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 --- 12 unchanged lines hidden (view full) --- 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 { |
97 return IPR_GENERIC | (IPR_CLASS_PSEUDO_INST << IPR_CLASS_SHIFT) | | 86 return (IPR_CLASS_PSEUDO_INST << IPR_CLASS_SHIFT) | |
98 (func << 8) | subfunc; 99 } 100 101 /** 102 * Check if this is an platform independent IPR access 103 * 104 * Accesses to internal platform independent gem5 registers are 105 * handled by handleGenericIprRead() and 106 * handleGenericIprWrite(). This method determines if a packet 107 * should be routed to those functions instead of the platform 108 * specific code. 109 * 110 * @see handleGenericIprRead 111 * @see handleGenericIprWrite 112 */ 113 inline bool 114 isGenericIprAccess(const Packet *pkt) 115 { | 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 { |
116 return pkt->getAddr() & IPR_GENERIC; | 105 Request::Flags flags(pkt->req->getFlags()); 106 return (flags & Request::MMAPPED_IPR) && 107 (flags & Request::GENERIC_IPR); |
117 } 118 119 /** 120 * Handle generic IPR reads 121 * 122 * @param xc Thread context of the current thread. 123 * @param pkt Packet from the CPU 124 * @return Latency in CPU cycles --- 57 unchanged lines hidden --- | 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 --- 57 unchanged lines hidden --- |