mbv: now with functioning timer interrupts!

And a few other nice things.
The bootloader now has an embedded wozmon!
If you know its offset, you can jump to it from the app.

mbv/configure

@@ -18,6 +18,7 @@ hostcflags = "-g -std=c++20 -fprofile-instr-generate -fcoverage-mapping"
 hostlibs = "-lgtest -lgmock -lgtest_main"
 hostldflags = "-fprofile-instr-generate -fcoverage-mapping"
 include_dirs = [
+    "hal",
     "hal/uart",
     "hal/lib/common",
 ]
@@ -31,7 +32,7 @@ common_flags = [
     "-Wall",
     "-Wextra",
     "-flto",
-    "-march=rv32i",
+    "-march=rv32i_zicsr",
     "-ffunction-sections",
     "-Oz",
 ]
@@ -44,7 +45,7 @@ ldflags = [
     "-Wl,--gc-sections",
     "-Wl,--print-memory-usage",
     "-flto",
-    "-march=rv32i",
+    "-march=rv32i_zicsr",
 ]
 
 
@@ -244,6 +245,8 @@ def make_coverage(binaries):
 
 
 hal = source_set("hal", [
+        "hal/intc.cc",
+        "hal/interrupts.cc",
         "hal/start.cc",
         "hal/lib/common/xil_assert.c",
         "hal/uart/xuartlite.c",
@@ -252,9 +255,6 @@ hal = source_set("hal", [
         ])
 
 bootloader = source_set("bootloader", glob.glob("./bootloader/**/*.cc", recursive=True))
-helloworld = source_set("helloworld", glob.glob("./apps/helloworld/**/*.cc", recursive=True))
-wozmon = source_set("wozmon", glob.glob("./apps/wozmon/**/*.cc", recursive=True))
-
 bootloader_image = build_image(
     bootloader,
     dependencies=[hal],
@@ -262,22 +262,22 @@ bootloader_image = build_image(
     linker_script="bootloader/bootloader.ld",
 )
 
-helloworld_image = build_image(
-    helloworld,
-    dependencies=[hal],
-    elf_out="out/helloworld.elf",
-    bin_out="out/helloworld.bin",
-)
+def app_image(app):
+    return build_image(
+            source_set(app, glob.glob(f"./apps/{app}/**/*.cc", recursive=True)),
+            dependencies=[hal],
+            elf_out=f"out/{app}.elf",
+            bin_out=f"out/{app}.bin",
+    )
 
-wozmon_image = build_image(
-    wozmon,
-    dependencies=[hal],
-    elf_out="out/wozmon.elf",
-    bin_out="out/wozmon.bin",
-    linker_script = "apps/fromddr.ld",
-)
+all = [
+        build_source_set(hal),
+        bootloader_image,
 
-all = [build_source_set(hal), bootloader_image, helloworld_image, wozmon_image]
+        app_image("helloworld"),
+        app_image("wozmon"),
+        app_image("timer"),
+]
 
 
 def parse_args():