Last change
on this file since 72 was
72,
checked in by rosiere, 16 years ago
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- SystemC de l'unite fonctionnelle.
- gestion des groupes / instructions custom
|
File size:
1.7 KB
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Rev | Line | |
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[72] | 1 | #include "Behavioural/include/SPR_access_mode.h" |
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| 2 | |
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| 3 | namespace morpheo { |
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| 4 | namespace behavioural { |
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| 5 | |
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| 6 | |
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| 7 | // SM : Supervisor Mode |
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| 8 | // * 0 : User Mode |
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| 9 | // * 1 : Supervisor Mode |
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| 10 | // SUMRA : SPRs User Mode Read Access |
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| 11 | // * 0 : All SPRs are inaccessible in user mode |
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| 12 | // * 1 : Certain SPRs can be read in user mode |
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| 13 | |
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| 14 | bool SPR_access_mode::read (spr_address_t address, Tcontrol_t SM, Tcontrol_t SUMRA) |
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| 15 | { |
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| 16 | if (not valid(address)) |
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| 17 | return false; |
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| 18 | |
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| 19 | spr_access_mode_t mode = _spr_generic [address._group][address._register]; |
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| 20 | |
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| 21 | return (((SM == 1) and ( (mode._supervisor_access_mode == SPR_ACCESS_MODE_READ_ONLY ) or |
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| 22 | (mode._supervisor_access_mode == SPR_ACCESS_MODE_READ_WRITE ))) or |
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| 23 | ((SM == 0) and ( (mode._user_access_mode == SPR_ACCESS_MODE_READ_ONLY ) or |
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| 24 | (mode._user_access_mode == SPR_ACCESS_MODE_READ_WRITE ) or |
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| 25 | ((mode._user_access_mode == SPR_ACCESS_MODE_READ_ONLY_COND) and (SUMRA == 1))))); |
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| 26 | } |
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| 27 | |
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| 28 | bool SPR_access_mode::write(spr_address_t address, Tcontrol_t SM, Tcontrol_t SUMRA) |
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| 29 | { |
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| 30 | if (not valid(address)) |
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| 31 | return false; |
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| 32 | |
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| 33 | spr_access_mode_t mode = _spr_generic [address._group][address._register]; |
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| 34 | |
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| 35 | return (((SM == 1) and ( (mode._supervisor_access_mode == SPR_ACCESS_MODE_WRITE_ONLY ) or |
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| 36 | (mode._supervisor_access_mode == SPR_ACCESS_MODE_READ_WRITE ))) or |
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| 37 | ((SM == 0) and ( (mode._user_access_mode == SPR_ACCESS_MODE_WRITE_ONLY ) or |
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| 38 | (mode._user_access_mode == SPR_ACCESS_MODE_READ_WRITE )))) ; |
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| 39 | } |
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| 40 | |
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| 41 | }; // end namespace behavioural |
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| 42 | }; // end namespace morpheo |
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| 43 | |
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