Add console interrupt support

3 files changed, 90 insertions, 0 deletions

diff --git a/c/inline/Makefile b/c/inline/Makefile
new file mode 100644
index 0000000..4a1fb6e
--- /dev/null
+++ b/c/inline/Makefile
@@ -0,0 +1,20 @@
+all: inline.hex
+
+inline.o: inline.c
+	clang -target riscv32-none-elf -I../rvcontroller-libraries -march=rv32imacb_zicntr_zicond_zicsr_zifencei_zihintpause_zilsd_zclsd_zabha_zacas_zbkb_zbkx_zcb_zcmp_zcmt -ffreestanding -O3 -c -o inline.o inline.c
+
+inline.elf: ../rvcontroller-libraries/rvcontroller-init.o ../rvcontroller-libraries/rvcontroller-ecalls.o inline.o
+	clang -target riscv32-none-elf -T rvcontroller.ld -nostdlib -nostartfiles -Xlinker --no-warn-rwx-segments -o inline.elf ../rvcontroller-libraries/rvcontroller-init.o inline.o ../rvcontroller-libraries/rvcontroller-ecalls.o
+
+dump: inline.elf
+	riscv32-none-elf-objdump -d inline.elf
+
+inline.hex: inline.elf
+	riscv32-none-elf-objcopy -O ihex inline.elf inline.hex
+
+load: inline.hex
+	bash -c "wl-copy < inline.hex"
+
+clean:
+	rm -f inline.hex inline.elf inline.o init.o
+
diff --git a/c/inline/inline.c b/c/inline/inline.c
new file mode 100644
index 0000000..c8db8e3
--- /dev/null
+++ b/c/inline/inline.c
@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include "rvcontroller-ecalls.h"
+
+volatile char thischar;
+
+volatile uint32_t nonblocking_read() {
+	volatile uint32_t ret;
+	asm(
+		"li a7,132  \n\
+		 ecall      \n\
+		 mv %0,a0   \n"
+		: "=r" (ret)
+		:
+		: "a0"
+	);
+	return ret;
+}
+
+void main() {
+	while (true) {
+		thischar = nonblocking_read();
+		//printint(thischar);
+	}
+}
diff --git a/c/inline/rvcontroller.ld b/c/inline/rvcontroller.ld
new file mode 100644
index 0000000..985892b
--- /dev/null
+++ b/c/inline/rvcontroller.ld
@@ -0,0 +1,45 @@
+/* Thanks https://github.com/darklife/darkriscv */
+  __heap_size    = 0x200;  /* required amount of heap */
+  __stack_size  = 0x800;  /* required amount of stack */
+  ENTRY(_start);
+  MEMORY
+  {
+    RAM (rwx) : ORIGIN = 0x00000000, LENGTH = 0x10000
+  }
+  SECTIONS
+  {
+    .text :
+    {
+      *(.text.startup)
+      *(.text)
+      *(.text)
+      *(.rodata*)
+    } > RAM
+    .data :
+    {
+      *(.sbss)
+      *(.data)
+      *(.bss)
+      *(.rela*)
+      *(COMMON)
+    } > RAM
+
+    .heap :
+    {
+      . = ALIGN(4);
+      PROVIDE ( end = . );
+      _sheap = .;
+      . = . + __heap_size;
+      . = ALIGN(4);
+      _eheap = .;
+    } >RAM
+
+    .stack :
+    {
+      . = ALIGN(4);
+      _estack = .;
+      . = . + __stack_size;
+      . = ALIGN(4);
+      _sstack = .;
+    } >RAM
+  }