feat(io): ✨ start lab#1

6 свв/лабораторные/lab1/.gitignore

@@ -0,0 +1,6 @@
+# Building
+*.elf
+*.map
+
+# IDEs
+.vscode/

6 свв/лабораторные/lab1/io.c

@@ -0,0 +1,12 @@
+#include "io.h"
+
+void putchar(char ch);
+
+void
+puts(const char *s)
+{
+  while (*s)
+  {
+      putchar(*s++);
+  }
+}

6 свв/лабораторные/lab1/io.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#define va_list  __builtin_va_list
+#define va_start __builtin_va_start
+#define va_end   __builtin_va_end
+#define va_arg   __builtin_va_arg
+
+extern void puts(const char *s);
+extern void printf(const char *fmt, ...);

6 свв/лабораторные/lab1/kernel.c

@@ -0,0 +1,72 @@
+#include "kernel.h"
+#include "io.h"
+
+extern char __bss[], __bss_end[], __stack_top[];
+
+struct sbiret
+sbi_call(long arg0, long arg1, long arg2, long arg3, long arg4, long arg5, long fid, long eid)
+{
+  register long a0 __asm__("a0") = arg0;
+  register long a1 __asm__("a1") = arg1;
+  register long a2 __asm__("a2") = arg2;
+  register long a3 __asm__("a3") = arg3;
+  register long a4 __asm__("a4") = arg4;
+  register long a5 __asm__("a5") = arg5;
+  register long a6 __asm__("a6") = fid;
+  register long a7 __asm__("a7") = eid;
+
+  __asm__ __volatile__("ecall"
+                  : "=r"(a0), "=r"(a1)
+                  : "r"(a0), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), "r"(a6), "r"(a7)
+                  : "memory");
+  return (struct sbiret) {.error = a0, .value = a1};
+}
+
+void
+putchar(char ch)
+{
+  sbi_call(ch, 0, 0, 0, 0, 0, 0, SBI_ECALL_0_1_PUTCHAR);
+}
+
+int
+getchar(void)
+{
+  struct sbiret ret;
+
+  do
+  {
+    ret = sbi_call(0, 0, 0, 0, 0, 0, 0, SBI_ECALL_0_1_GETCHAR);
+  } while (ret.error == SBI_ERR_FAILED);
+
+  return (int) ret.error;
+}
+
+// TODO
+void
+kernel_main(void)
+{
+  for(char *p = __bss; p < __bss_end; p++)
+  {
+    *p = 0;
+  }
+
+  puts("Hello World!");
+
+  for(;;)
+  {
+    __asm__ __volatile__("wfi");
+  }
+}
+
+__attribute__((section(".text.boot")))
+__attribute__((naked))
+void
+boot(void)
+{
+  __asm__ __volatile__(
+          "mv sp, %[stack_top]\n"
+          "j kernel_main\n"
+          :
+          : [stack_top] "r" (__stack_top)
+  );
+}

6 свв/лабораторные/lab1/kernel.h

@@ -0,0 +1,19 @@
+#pragma once
+
+struct sbiret {
+  long error;
+  long value;
+};
+
+#define SBI_SUCCESS           0
+#define SBI_ERR_FAILED        -1
+#define SBI_ECALL_0_1_PUTCHAR 0x01
+#define SBI_ECALL_0_1_GETCHAR 0x02
+#define SBI_EXT_BASE          0x10
+#define SBI_EXT_VER           0x00
+#define SBI_EXT_PMU           0x504D55
+#define SBI_EXT_CTR_NUM       0x00
+#define SBI_EXT_CTR_DTLS      0x01
+#define SBI_EXT_HSM           0x48534D
+#define SBI_EXT_SRST          0x53525354
+#define SBI_EXT_SHUTDOWN      0x00

6 свв/лабораторные/lab1/kernel.ld

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+ENTRY(boot)
+
+SECTIONS {
+  . = 0x80200000;
+
+  .text :{
+    KEEP(*(.text.boot));
+    *(.text .text.*);
+  }
+
+  .rodata : ALIGN(4) {
+    *(.rodata .rodata.*);
+  }
+
+  .data : ALIGN(4) {
+    *(.data .data.*);
+  }
+
+  .bss : ALIGN(4) {
+    __bss = .;
+    *(.bss .bss.* .sbss .sbss.*);
+    __bss_end = .;
+  }
+
+  . = ALIGN(4);
+  . += 128 * 1024;
+  __stack_top = .;
+}

6 свв/лабораторные/lab1/run.sh

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+#!/bin/bash
+
+set -xue
+
+QEMU=qemu-system-riscv32
+
+CC=clang
+CFLAGS="-std=c11 -O2 -g3 -Wall -Wextra --target=riscv32 -ffreestanding -nostdlib"
+
+$CC $CFLAGS -Wl,-Tkernel.ld -Wl,-Map=kernel.map -o kernel.elf \
+    kernel.c io.c
+
+$QEMU -machine virt -bios default -nographic -serial mon:stdio --no-reboot \
+    -kernel kernel.elf