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core/sal: interface for backend-specific notion of time

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This adds an interface for a backend-specific notion of time, e.g. CPU
cycles since simulator start, and a concrete implementation for the
Bochs backend.  This is needed to record CPU idle times (e.g., HLT
instruction), and for target backends capable of more timing-accurate
execution.

This change also modifies the tracing plugin to add the time to all
trace events.

Change-Id: I93ac1d54c07f32b0b8f84f333417741d8e9c8288
This commit is contained in:
Horst Schirmeier
2013-03-28 19:22:08 +01:00
parent 6b5728ece1
commit e5fe9dd525
6 changed files with 53 additions and 4 deletions
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5
src/core/sal/SALConfig.hpp
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@ -27,6 +27,11 @@ typedef uint8_t byte_t; //!< 8 bit type for memory access (read or
typedef uint32_t regwidth_t; //!< type of register width [bits]
typedef register_data_t regdata_t; //!< type of register data
typedef timer_t timer_id_t; //!< type of timer IDs
//! backend-specific notion of time, e.g. CPU cycles or nanoseconds
//! (move this to backend-specific headers when necessary)
typedef uint64_t simtime_t;
//! backend-specific notion of time difference
typedef int64_t simtime_diff_t;
// Note: The following flags are defined in SALConfig.cc.