Load kernel on qemu/k210.

.gitignore

 .idea/*
 os/target/*
+os/.idea/*

os/.cargo/config

 [build]
-target = "riscv64gc-unknown-none-elf"
\ No newline at end of file
+target = "riscv64gc-unknown-none-elf"
+
+[target.riscv64gc-unknown-none-elf]
+rustflags = [
+    "-Clink-arg=-Tsrc/linker.ld", "-Cforce-frame-pointers=yes"
+]

os/Makefile

+# Building
+TARGET := riscv64gc-unknown-none-elf
+MODE := release
+KERNEL_ELF := target/$(TARGET)/$(MODE)/os
+KERNEL_BIN := $(KERNEL_ELF).bin
+DISASM_TMP := target/$(TARGET)/$(MODE)/asm
+
+# BOARD
+BOARD		?= qemu
+SBI			?= rustsbi
+BOOTLOADER	:= ../bootloader/$(SBI)-$(BOARD).bin
+
+# Run K210
+K210-SERIALPORT	= /dev/ttyUSB0
+K210-BURNER		= ../tools/kflash.py
+
+# Binutils
+OBJDUMP := rust-objdump --arch-name=riscv64
+OBJCOPY := rust-objcopy --binary-architecture=riscv64
+
+# Disassembly
+DISASM ?= -x
+
+build: $(KERNEL_BIN)
+
+$(KERNEL_BIN): kernel
+	@$(OBJCOPY) $(KERNEL_ELF) --strip-all -O binary $@
+
+kernel:
+	@cargo build --release
+
+clean:
+	@cargo clean
+
+disasm: kernel
+	@$(OBJDUMP) $(DISASM) $(KERNEL_ELF) | less
+
+disasm-vim: kernel
+	@$(OBJDUMP) $(DISASM) $(KERNEL_ELF) > $(DISASM_TMP)
+	@vim $(DISASM_TMP)
+	@rm $(DISASM_TMP)
+
+run: run-inner
+
+run-inner: build
+ifeq ($(BOARD),qemu)
+	@qemu-system-riscv64 \
+		-machine virt \
+		-nographic \
+		-bios $(BOOTLOADER) \
+		-device loader,file=$(KERNEL_BIN),addr=0x80020000
+else
+	@cp $(BOOTLOADER) $(BOOTLOADER).copy
+	@dd if=$(KERNEL_BIN) of=$(BOOTLOADER).copy bs=128K seek=1
+	@mv $(BOOTLOADER).copy $(KERNEL_BIN)
+	@sudo chmod 777 $(K210-SERIALPORT)
+	python3 $(K210-BURNER) -p $(K210-SERIALPORT) -b 1500000 $(KERNEL_BIN)
+	miniterm --eol LF --dtr 0 --rts 0 --filter direct $(K210-SERIALPORT) 115200
+endif
+
+.PHONY: build kernel clean disasm disasm-vim run-inner

os/rust-toolchain

+nightly-2020-11-01
\ No newline at end of file

os/src/entry.asm

+    .section .text.entry
+    .globl _start
+_start:
+    la sp, boot_stack_top
+    call rust_main
+
+    .section .bss.stack
+    .globl boot_stack
+boot_stack:
+    .space 4096 * 16
+    .globl boot_stack_top
+boot_stack_top:
\ No newline at end of file

os/src/linker.ld

+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+BASE_ADDRESS = 0x80020000;
+
+SECTIONS
+{
+    . = BASE_ADDRESS;
+    skernel = .;
+
+    stext = .;
+    .text : {
+        *(.text.entry)
+        *(.text)
+    }
+
+    . = ALIGN(4K);
+    etext = .;
+    srodata = .;
+    .rodata : {
+        *(.rodata)
+    }
+
+    . = ALIGN(4K);
+    erodata = .;
+    sdata = .;
+    .data : {
+        *(.data)
+    }
+
+    . = ALIGN(4K);
+    edata = .;
+    sbss = .;
+    .bss : {
+        *(.bss)
+    }
+
+    . = ALIGN(4K);
+    ebss = .;
+    .stack : {
+        *(.bss.stack)
+    }
+
+    ekernel = .;
+
+    /DISCARD/ : {
+        *(.eh_frame)
+    }
+}
\ No newline at end of file

os/src/main.rs

 #![no_std]
 #![no_main]
+#![feature(global_asm)]
 
 mod lang_items;
 
+global_asm!(include_str!("entry.asm"));
+
+#[no_mangle]
+pub extern "C" fn rust_main() -> ! {
+    loop {}
+}
\ No newline at end of file