From 33e4744d1c73c9f5512abb4010e4cc81763ab3a2 Mon Sep 17 00:00:00 2001
From: cheapie <cheapiephp@gmail.com>
Date: Fri, 19 Jun 2026 22:38:28 -0500
Subject: Add machine timer interrupt

---
 assembly/timer-test/Makefile        |  24 ++++++++++++++++++++++++
 assembly/timer-test/rvcontroller.ld |   1 +
 assembly/timer-test/timer-test.S    |  36 ++++++++++++++++++++++++++++++++++++
 assembly/timer-test/timer-test.elf  | Bin 0 -> 5352 bytes
 assembly/timer-test/timer-test.hex  |   7 +++++++
 assembly/timer-test/timer-test.o    | Bin 0 -> 1324 bytes
 6 files changed, 68 insertions(+)
 create mode 100644 assembly/timer-test/Makefile
 create mode 120000 assembly/timer-test/rvcontroller.ld
 create mode 100644 assembly/timer-test/timer-test.S
 create mode 100755 assembly/timer-test/timer-test.elf
 create mode 100644 assembly/timer-test/timer-test.hex
 create mode 100644 assembly/timer-test/timer-test.o

(limited to 'assembly/timer-test')

diff --git a/assembly/timer-test/Makefile b/assembly/timer-test/Makefile
new file mode 100644
index 0000000..7989624
--- /dev/null
+++ b/assembly/timer-test/Makefile
@@ -0,0 +1,24 @@
+MARCH ?= rv32imacbzicntr_zicond_zicsr_zifencei_zihintpause_zilsd_zclsd_zabha_zacas_zbkb_zbkx_zcb_zcmp_zcmt
+
+.PHONY: all dump load clean
+
+all: timer-test.hex
+
+timer-test.o: timer-test.S
+	riscv32-none-elf-as -I../rvcontroller-libraries -march=${MARCH} -o timer-test.o timer-test.S
+
+timer-test.elf:  timer-test.o
+	riscv32-none-elf-ld -T rvcontroller.ld --no-warn-rwx-segments -o timer-test.elf timer-test.o
+
+dump: timer-test.elf
+	riscv32-none-elf-objdump -d timer-test.elf
+
+timer-test.hex: timer-test.elf
+	riscv32-none-elf-objcopy -O ihex timer-test.elf timer-test.hex
+
+load: timer-test.hex
+	bash -c "wl-copy < timer-test.hex"
+
+clean:
+	rm -f timer-test.hex timer-test.elf timer-test.o
+
diff --git a/assembly/timer-test/rvcontroller.ld b/assembly/timer-test/rvcontroller.ld
new file mode 120000
index 0000000..bc01402
--- /dev/null
+++ b/assembly/timer-test/rvcontroller.ld
@@ -0,0 +1 @@
+../../rvcontroller.ld
\ No newline at end of file
diff --git a/assembly/timer-test/timer-test.S b/assembly/timer-test/timer-test.S
new file mode 100644
index 0000000..e114f3f
--- /dev/null
+++ b/assembly/timer-test/timer-test.S
@@ -0,0 +1,36 @@
+la t0,handler
+csrw mtvec,t0 # Set trap handler address and mode (0/direct)
+li t0,0x400
+csrc mstatush,t0 # Enable trap handler
+li t0,0x80
+csrw mie,t0 # Enable machine timer interrupt and disable others
+
+la t0,mmio
+csrw 0x801,t0 # Set up MMIO base address
+
+lw t1,2(t0) # Read current time
+addi t1,t1,5
+sw t1,10(t0) # Set mtimecmp to 5 seconds in the future
+
+csrsi mstatus,8 # Enable interrupts globally
+
+wfi # Wait for the interrupt to trigger
+
+li a7,10 # Exit program
+ecall
+
+.balign 4
+handler:
+li t1,-1
+sw t1,10(t0) # Set mtimecmp to the distant future
+csrr a0,mcause
+li a7,1 # Print integer
+ecall
+
+li a0,'\n'
+li a7,11 # Print character
+ecall
+
+mret
+
+mmio:
diff --git a/assembly/timer-test/timer-test.elf b/assembly/timer-test/timer-test.elf
new file mode 100755
index 0000000..729cb45
Binary files /dev/null and b/assembly/timer-test/timer-test.elf differ
diff --git a/assembly/timer-test/timer-test.hex b/assembly/timer-test/timer-test.hex
new file mode 100644
index 0000000..c909eb4
--- /dev/null
+++ b/assembly/timer-test/timer-test.hex
@@ -0,0 +1,7 @@
+:1000000097020000938202047390523093020040E2
+:1000100073B00231930200087390423097020000DF
+:10002000938202047390128003A32200150323A578
+:1000300062007360043073005010A9487300000020
+:100040007D5323A56200732520348548730000008A
+:0E0050002945AD487300000073002030010008
+:00000001FF
diff --git a/assembly/timer-test/timer-test.o b/assembly/timer-test/timer-test.o
new file mode 100644
index 0000000..3f2e505
Binary files /dev/null and b/assembly/timer-test/timer-test.o differ
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