os-workshop

commit 9768a2b62981aacbd0e9a92087cb7116d5ec8e17
parent 21ef5111f4ced2aa63a2c18c97d47750b966e3dc
Author: Brian Swetland <swetland@frotz.net>
Date:   Fri, 22 Apr 2022 11:16:11 -0700

samples: mandelbrot and info

Diffstat:
A
misc/info.c
 | 
19
+++++++++++++++++++
A
misc/mandelbrot.c
 | 
32
++++++++++++++++++++++++++++++++
A
project/info.mk
 | 
5
+++++
A
project/mandelbrot.mk
 | 
5
+++++

4 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/misc/info.c b/misc/info.c
@@ -0,0 +1,19 @@
+// Copyright 2022, Brian Swetland <swetland@frotz.net>
+// Licensed under the Apache License, Version 2.0
+
+#include <hw/debug.h>
+#include <hw/riscv.h>
+
+void main(void) {
+	xprintf("Hello?\n");
+	xprintf("MSTATUS    %08x\n", csr_read(CSR_MSTATUS));
+	xprintf("MISA       %08x\n", csr_read(CSR_MISA));
+	xprintf("MCYCLE     %08x\n", csr_read(CSR_MCYCLE));
+
+	uint32_t n = csr_read(CSR_MISA);
+	xprintf("ISA: RV32");
+	for (int i = 0; i < 26; i++) {
+		if (n & (1<<i)) xputc('A'+i);
+	}
+	xputc('\n');
+}
diff --git a/misc/mandelbrot.c b/misc/mandelbrot.c
@@ -0,0 +1,32 @@
+// Copyright 2022, Brian Swetland <swetland@frotz.net>
+// Licensed under the Apache License, Version 2.0
+
+#include <hw/debug.h>
+
+int main(int argc, char** argv) {
+	int top = 1000, bottom = -1000, ystep = 50;
+	int left = -2500, right = 1000, xstep = 30;
+	int maxiter = 1000;
+
+	for (int y0 = top; y0 > bottom; y0 -= ystep) {
+		for (int x0 = left; x0 < right; x0 += xstep) {
+			int i = 0, x = 0, y = 0, ch = ' ';
+			while (i < maxiter) {
+				int x2 = x * x / 1000;
+				int y2 = y * y / 1000;
+				if ((x2 + y2) > 4000) {
+					ch = (i > 9) ? '@' : (i + '0');
+					break;
+				}
+				y = 2 * x * y / 1000 + y0;
+				x = x2 - y2 + x0;
+				i++;
+			}
+			xputc(ch);
+		}
+		xputc('\n');
+	}
+
+	xprintf("Hello, Mandlebrot!\n");
+	return 0;
+}
diff --git a/project/info.mk b/project/info.mk
@@ -0,0 +1,5 @@
+
+APP := info
+SRC := hw/src/start.S misc/info.c
+SRC += hw/src/debug.c $(LIBC_SRC)
+include make/app.mk
diff --git a/project/mandelbrot.mk b/project/mandelbrot.mk
@@ -0,0 +1,5 @@
+
+APP := mandelbrot
+SRC := hw/src/start.S misc/mandelbrot.c
+SRC += hw/src/debug.c $(LIBC_SRC)
+include make/app.mk