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util: Expose addr config mechanisms in the gem5 op java wrapper.

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These allow you to set the target physical address, and map or unmap the
region of physical memory. This is not automatic for two reasons. First,
the address needs to be configured before the mapping is done, and
there's no way to ensure that ordering when everything is handled
automatically. Second, if the user isn't going to use the address based
mechanism, then the mapping and access to /dev/mem isn't necessary and
may prevent using the other call types.

Change-Id: I0f9c32d6bfa402ba59ea1bf5672fb7f11003568d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28184
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Gabe Black
2020-10-22 20:01:08 -07:00
parent c3f882f905
commit 3fa1ce6d72
3 changed files with 36 additions and 0 deletions
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4
util/m5/src/java/gem5/Ops.java
View File

@@ -53,6 +53,10 @@ public class Ops {
private static Map<String, Ops> _callTypes;
public static final Map<String, Ops> callTypes;
public static native void setAddr(long addr);
public static native void mapMem();
public static native void unmapMem();
static {
try {
File temp_lib = File.createTempFile("gem5Ops", ".so");

19
util/m5/src/java/gem5/ops.cc
View File

@@ -44,6 +44,7 @@
#include "call_type/semi_dt.hh"
#include "gem5/m5ops.h"
#include "java/gem5_Ops.h"
#include "m5_mmap.h"
#define _stringify(x) #x
#define stringify(x) _stringify(x)
@@ -108,6 +109,24 @@ Java_gem5_Ops_setupCallTypes(JNIEnv *env, jclass clazz)
env->DeleteLocalRef(map);
}
JNIEXPORT void JNICALL
Java_gem5_Ops_setAddr(JNIEnv *env, jclass clazz, jlong addr)
{
m5op_addr = addr;
}
JNIEXPORT void JNICALL
Java_gem5_Ops_mapMem(JNIEnv *env, jclass clazz)
{
map_m5_mem();
}
JNIEXPORT void JNICALL
Java_gem5_Ops_unmapMem(JNIEnv *env, jclass clazz)
{
unmap_m5_mem();
}
static DispatchTable *
getDispatchTable(JNIEnv *env, jobject obj)
{