Handout

libsys/Makefile

@@ -0,0 +1,23 @@
+# --------------------------------------------------------------------------
+# Files to be compiled (important: defined prior to importing common.mk!)
+CC_SOURCES = $(shell find * -name "*.cc")
+ASM_SOURCES = $(shell find * -name "*.asm")
+
+# -----------------------------------------------------------------------------
+# Include global variables and default targets
+
+include ../tools/common.mk
+
+# --------------------------------------------------------------------------
+# Default target
+
+.DEFAULT_GOAL = all
+all: $(BUILDDIR)/libsys.a
+
+# --------------------------------------------------------------------------
+# Package libsys.a
+
+$(BUILDDIR)/libsys.a:  $(ASM_OBJECTS) $(CC_OBJECTS) $(MAKEFILE_LIST)
+	@echo "AR		$@"
+	@mkdir -p $(@D)
+	$(VERBOSE) $(AR) rcs $@  $(ASM_OBJECTS) $(CC_OBJECTS)

libsys/iostream.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "outputstream.h"
+#include "stub.h"
+
+class IOStream : public OutputStream {
+   private:
+	IOStream(IOStream &copy);  // no copy
+	int fd;
+
+   public:
+	explicit IOStream(int sysfd = 0) : fd(sysfd) {}
+
+	~IOStream() {
+		if (pos > 0) {
+			sys_write(fd, buffer, pos);
+		}
+	}
+
+	void flush() override {
+		sys_write(fd, buffer, pos);
+		pos = 0;
+	}
+};

libsys/libc.cc

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+../kernel/compiler/libc.cc

libsys/libc.h

@@ -0,0 +1 @@
+../kernel/compiler/libc.h

libsys/math.h

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+../kernel/utils/math.h

libsys/outputstream.cc

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+../kernel/object/outputstream.cc

libsys/outputstream.h

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+../kernel/object/outputstream.h

libsys/rand.cc

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+#include "rand.h"
+
+// Mersenne Twister (32 bit pseudorandom number generator)
+// https://en.wikipedia.org/wiki/Mersenne_Twister
+
+static const uint32_t N = 624;
+static const uint32_t M = 397;
+static const uint32_t R = 31;
+static const uint32_t A = 0x9908B0DF;
+
+// initialization multiplier
+static const uint32_t F = 1812433253;
+
+static const uint32_t U = 11;
+
+static const uint32_t S = 7;
+static const uint32_t B = 0x9D2C5680;
+
+static const uint32_t T = 15;
+static const uint32_t C = 0xEFC60000;
+
+static const uint32_t L = 18;
+
+static const uint32_t MASK_LOWER = (1ULL << R) - 1;
+static const uint32_t MASK_UPPER = (1ULL << R);
+
+static uint32_t mt[N];
+static uint16_t index;
+
+void srand(const uint32_t seed) {
+	mt[0] = seed;
+
+	for (uint32_t i = 1; i < N; i++) {
+		mt[i] = (F * (mt[i - 1] ^ (mt[i - 1] >> 30)) + i);
+	}
+
+	index = N;
+}
+
+uint32_t rand() {
+	uint16_t v = index;
+
+	if (index >= N) {
+		// Twist
+		for (uint32_t i = 0; i < N; i++) {
+			uint32_t x = (mt[i] & MASK_UPPER) + (mt[(i + 1) % N] & MASK_LOWER);
+
+			uint32_t xA = x >> 1;
+
+			if ((x & 0x1) != 0) {
+				xA ^= A;
+			}
+
+			mt[i] = mt[(i + M) % N] ^ xA;
+		}
+		v = index = 0;
+	}
+
+	uint32_t y = mt[v];
+	index = v + 1;
+
+	y ^= (y >> U);
+	y ^= (y << S) & B;
+	y ^= (y << T) & C;
+	y ^= (y >> L);
+
+	return y;
+}

libsys/rand.h

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+#pragma once
+
+#include "types.h"
+
+const uint32_t RAND_MAX = UINT32_MAX;
+
+void srand(uint32_t seed);
+
+uint32_t rand();

libsys/string.cc

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+../kernel/utils/string.cc

libsys/string.h

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+../kernel/utils/string.h

libsys/stringbuffer.cc

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+../kernel/object/stringbuffer.cc

libsys/stringbuffer.h

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+../kernel/object/stringbuffer.h

libsys/stub.asm

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+../kernel/syscall/stub.asm

libsys/stub.h

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+../kernel/syscall/stub.h

libsys/types.h

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+../kernel/types.h