From 619725a5f2f5272f9cbb547ed95c87312c2765a9 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Thu, 15 Sep 2022 00:37:13 +0300
Subject: add SYS_TICKS

---
 arch/riscv64/conf/init   | Bin 1232 -> 2136 bytes
 arch/riscv64/conf/init.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++
 arch/riscv64/conf/initrd | Bin 1536 -> 2560 bytes
 3 files changed, 106 insertions(+)
 create mode 100644 arch/riscv64/conf/init.c

(limited to 'arch/riscv64/conf')

diff --git a/arch/riscv64/conf/init b/arch/riscv64/conf/init
index 23c3097..d9a585d 100755
Binary files a/arch/riscv64/conf/init and b/arch/riscv64/conf/init differ
diff --git a/arch/riscv64/conf/init.c b/arch/riscv64/conf/init.c
new file mode 100644
index 0000000..4bd6a4e
--- /dev/null
+++ b/arch/riscv64/conf/init.c
@@ -0,0 +1,106 @@
+/* This file is allowed to be undocumented as it is only temporarily in this
+ * tree. At some point in the (hopefully) near future, I intend to move the
+ * kernel code and initrd generation stuff into separate repositories, to make
+ * things easier for myself. For now though, this is good enough.
+ */
+
+/* compile with riscv64-unknown-elf-gcc -ffreestanding -nostdlib */
+/* create initrd with echo init | cpio -H newc -o > initrd */
+#include <stdint.h>
+#include "../../../include/apos/syscalls.h"
+
+static void sys_noop()
+{
+	long register a0 asm ("a0") = SYS_NOOP;
+	asm ("ecall" : : : "a0", "a1");
+}
+
+static void sys_putch(char c)
+{
+	long register a0 asm ("a0") = SYS_PUTCH;
+	long register a1 asm ("a1") = c;
+	asm ("ecall" : : : "a0", "a1");
+}
+
+static uint64_t sys_timebase()
+{
+	long register a0 asm ("a0") = SYS_TIMEBASE;
+	long register a1 asm ("a1") = 0;
+	asm ("ecall" : : : "a0", "a1");
+#if defined(_LP64)
+	return a1;
+#else
+	uint64_t t = a0;
+	t <<= 32;
+	return t + a1;
+#endif
+}
+
+static uint64_t sys_ticks()
+{
+	long register a0 asm ("a0") = SYS_TICKS;
+	long register a1 asm ("a1") = 0;
+	asm ("ecall" : : : "a0", "a1");
+#if defined(_LP64)
+	return a1;
+#else
+	uint64_t t = a0;
+	t <<= 32;
+	return t + a1;
+#endif
+}
+
+static void puts(const char *s)
+{
+	while (*s)
+		sys_putch(*s++);
+}
+
+static void _print_number(uint64_t v)
+{
+	if (v == 0)
+		return;
+
+	_print_number(v / 10);
+	sys_putch((v % 10) + '0');
+}
+
+static void print_number(uint64_t v)
+{
+	if (v == 0) {
+		sys_putch('0');
+		return;
+	}
+
+	_print_number(v);
+}
+
+static void print_value(const char *s, uint64_t v)
+{
+	puts(s);
+	puts(": ");
+
+	print_number(v);
+	sys_putch('\n');
+}
+
+void _start()
+{
+	sys_noop();
+	puts("Hello, world!\n");
+
+	uint64_t second = sys_timebase();
+	print_value("Timebase", second);
+
+	uint64_t n = 0, i, start;
+	start = i = sys_ticks();
+	print_value("Start ticks", start);
+
+	while (i < start + second) {
+		i = sys_ticks();
+		n++;
+	}
+
+	print_value("End ticks", i);
+	print_value("Syscalls per second", n);
+}
diff --git a/arch/riscv64/conf/initrd b/arch/riscv64/conf/initrd
index efba349..f05e035 100644
Binary files a/arch/riscv64/conf/initrd and b/arch/riscv64/conf/initrd differ
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