310551038 lab5–8

lab5/c/.clang-format

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+BasedOnStyle: LLVM

lab5/c/.gitignore

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+/build

lab5/c/Makefile

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+DEFAULT_PROFILE = DEBUG
+SRC_DIR         = src
+BUILD_DIR       = build
+
+AS      = aarch64-linux-gnu-as
+CC      = aarch64-linux-gnu-gcc
+CPP     = aarch64-linux-gnu-cpp
+OBJCOPY = aarch64-linux-gnu-objcopy
+
+CPPFLAGS_BASE = -Iinclude
+
+ASFLAGS_DEBUG = -g
+
+CFLAGS_BASE    = -std=c17 -pedantic-errors -Wall -Wextra -ffreestanding \
+                 -mcpu=cortex-a53+nofp+nosimd -mstrict-align
+CFLAGS_DEBUG   = -g
+CFLAGS_RELEASE = -O3 -flto
+
+LDFLAGS_BASE    = -nostdlib -Xlinker --build-id=none
+LDFLAGS_RELEASE = -flto -Xlinker --gc-sections
+
+LDLIBS_BASE = -lgcc
+
+OBJS      = start main console devicetree initrd panic shell \
+            drivers/aux drivers/gpio drivers/l1ic drivers/l2ic drivers/mailbox \
+            drivers/mini-uart drivers/pm \
+            mem/malloc mem/page-alloc mem/startup-alloc mem/types mem/vm \
+            sched/idle-thread sched/periodic-sched sched/run-signal-handler \
+            sched/sched sched/schedule sched/sig-handler-main \
+            sched/thread-main sched/user-program-main \
+            timer/delay timer/timeout \
+            xcpt/default-handler xcpt/irq-handler xcpt/svc-handler \
+            xcpt/syscall-table xcpt/task-queue xcpt/vector-table xcpt/xcpt \
+            xcpt/syscall/enosys xcpt/syscall/getpid xcpt/syscall/uart-read \
+            xcpt/syscall/uart-write xcpt/syscall/exec xcpt/syscall/fork \
+            xcpt/syscall/fork-impl xcpt/syscall/fork-child-ret \
+            xcpt/syscall/exit xcpt/syscall/mbox-call xcpt/syscall/kill \
+            xcpt/syscall/signal xcpt/syscall/signal-kill \
+            xcpt/syscall/sigreturn xcpt/syscall/sigreturn-check \
+            libc/ctype libc/stdio libc/stdlib/qsort libc/string \
+            utils/core-id utils/fmt utils/heapq utils/rb
+LD_SCRIPT = $(SRC_DIR)/linker.ld
+
+# ------------------------------------------------------------------------------
+
+PROFILE = $(DEFAULT_PROFILE)
+OUT_DIR = $(BUILD_DIR)/$(PROFILE)
+
+CPPFLAGS = $(CPPFLAGS_BASE) $(CPPFLAGS_$(PROFILE))
+ASFLAGS  = $(ASFLAGS_BASE) $(ASFLAGS_$(PROFILE))
+CFLAGS   = $(CFLAGS_BASE) $(CFLAGS_$(PROFILE))
+LDFLAGS  = $(LDFLAGS_BASE) $(LDFLAGS_$(PROFILE))
+LDLIBS   = $(LDLIBS_BASE) $(LDLIBS_$(PROFILE))
+
+OBJ_PATHS = $(addprefix $(OUT_DIR)/,$(addsuffix .o,$(OBJS)))
+
+# ------------------------------------------------------------------------------
+
+.PHONY: all qemu qemu-debug gdb clean-profile clean
+
+all: $(OUT_DIR)/kernel8.img
+
+$(OUT_DIR)/kernel8.img: $(OUT_DIR)/kernel8.elf
+	@mkdir -p $(@D)
+	$(OBJCOPY) -O binary $^ $@
+
+$(OUT_DIR)/kernel8.elf: $(OBJ_PATHS) $(LD_SCRIPT)
+	@mkdir -p $(@D)
+	$(CC) -T $(LD_SCRIPT) $(LDFLAGS) $(filter-out $(LD_SCRIPT),$^) $(LDLIBS) -o $@
+
+$(OUT_DIR)/%.o: $(SRC_DIR)/%.c
+	@mkdir -p $(@D)
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c -MMD -MP -MF $(OUT_DIR)/$*.d $< -o $@
+
+$(OUT_DIR)/%.o: $(OUT_DIR)/%.s
+	@mkdir -p $(@D)
+	$(AS) $(ASFLAGS) $^ -o $@
+
+$(OUT_DIR)/%.s: $(SRC_DIR)/%.S
+	@mkdir -p $(@D)
+	$(CPP) $(CPPFLAGS) $^ -o $@
+
+qemu: $(OUT_DIR)/kernel8.img
+	qemu-system-aarch64 -M raspi3b -kernel $< -initrd ../tests/initramfs.cpio \
+		-dtb ../tests/bcm2710-rpi-3-b-plus.dtb -display gtk -serial null \
+		-serial stdio
+
+qemu-debug: $(OUT_DIR)/kernel8.img
+	qemu-system-aarch64 -M raspi3b -kernel $< -initrd ../tests/initramfs.cpio \
+		-dtb ../tests/bcm2710-rpi-3-b-plus.dtb -display gtk -serial null \
+		-serial stdio -S -s
+
+gdb: $(OUT_DIR)/kernel8.elf
+	gdb -s $< -ex 'target remote :1234'
+
+clean-profile:
+	$(RM) -r $(OUT_DIR)
+
+clean:
+	$(RM) -r $(BUILD_DIR)
+
+-include $(OUT_DIR)/*.d

lab5/c/include/oscos/console.h

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+/// \file include/oscos/console.h
+/// \brief Serial console.
+///
+/// The serial console reads and writes data to the mini UART.
+///
+/// Before using the serial console, it must be initialized by calling
+/// console_init(void) exactly once. Initializing the serial console twice or
+/// operating on the serial console before initialization are not checked and
+/// may have unintended consequences.
+///
+/// The serial console implements two modes: text mode and binary mode. In text
+/// mode, automatic newline translation is performed. A "\r" character received
+/// by the mini UART will be read as "\n", and writing "\n" to the serial
+/// console will send "\r\n" down the mini UART. In binary mode, automatic
+/// newline translation is not performed. Any byte received by the mini UART
+/// will be read as-is, and every character written to the serial console will
+/// also be sent as-is. Upon initialization, the mode is set to text mode.
+
+#ifndef OSCOS_CONSOLE_H
+#define OSCOS_CONSOLE_H
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+/// \brief The mode of the serial console.
+typedef enum {
+  CM_TEXT,  ///< Text mode. Performs newline translation.
+  CM_BINARY ///< Binary mode. Every byte are sent/received as-is.
+} console_mode_t;
+
+/// \brief Initializes the serial console.
+///
+/// See the file-level documentation for requirements on initialization.
+void console_init(void);
+
+/// \brief Sets the mode of the serial console.
+///
+/// \param mode The mode. Must be `CM_TEXT` or `CM_BINARY`.
+void console_set_mode(console_mode_t mode);
+
+/// \brief Reads a character from the serial console.
+///
+/// When calling this function, the serial console must be initialized.
+unsigned char console_getc(void);
+
+/// \brief Reads a character from the serial console without blocking.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return The character read, or a negative number if the read would block.
+int console_getc_nonblock(void);
+
+/// \brief Reads as many characters from the serial console as possible without
+///        blocking.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return The number of characters read.
+size_t console_read_nonblock(void *buf, size_t count);
+
+/// \brief Writes a character to the serial console.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return \p c
+unsigned char console_putc(unsigned char c);
+
+/// \brief Writes a character to the serial console without blocking.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return \p c if the operation is successful, or a negative number if the
+///         write operation would block.
+int console_putc_nonblock(unsigned char c);
+
+/// \brief Writes characters to the serial console.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return \p count
+size_t console_write(const void *buf, size_t count);
+
+/// \brief Writes as many characters to the serial console as possible without
+///        blocking.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return The number of characters written.
+size_t console_write_nonblock(const void *buf, size_t count);
+
+/// \brief Writes a string to the serial console without trailing newline.
+///
+/// When calling this function, the serial console must be initialized.
+void console_fputs(const char *s);
+
+/// \brief Writes a string to the serial console with trailing newline.
+///
+/// When calling this function, the serial console must be initialized.
+void console_puts(const char *s);
+
+/// \brief Performs string formatting and writes the result to the serial
+///        console.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return The number of characters written.
+int console_vprintf(const char *restrict format, va_list ap)
+    __attribute__((format(printf, 1, 0)));
+
+/// \brief Performs string formatting and writes the result to the serial
+///        console.
+///
+/// When calling this function, the serial console must be initialized.
+///
+/// \return The number of characters written.
+int console_printf(const char *restrict format, ...)
+    __attribute__((format(printf, 1, 2)));
+
+/// \brief Registers the notification callback for read readiness.
+///
+/// \param callback The callback that will be called.
+/// \param arg The argument that will be passed to \p callback.
+/// \return true if the registration succeeds.
+/// \return false if the registration fails because an earlier callback has not
+///         been called.
+bool console_notify_read_ready(void (*callback)(void *), void *arg);
+
+/// \brief Registers the notification callback for write readiness.
+///
+/// \param callback The callback that will be called.
+/// \param arg The argument that will be passed to \p callback.
+/// \return true if the registration succeeds.
+/// \return false if the registration fails because an earlier callback has not
+///         been called.
+bool console_notify_write_ready(void (*callback)(void *), void *arg);
+
+/// \brief Interrupt handler. Not meant to be called directly.
+void mini_uart_interrupt_handler(void);
+
+#endif