🆕 原子变量和信号量

kernel/process/atomic.h

@@ -0,0 +1,99 @@
+/**
+ * @file atomic.h
+ * @author fslongjin (longjin@RinGoTek.cn)
+ * @brief 原子变量
+ * @version 0.1
+ * @date 2022-04-12
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+#pragma once
+
+#define atomic_read(atomic)	((atomic)->value)   // 读取原子变量
+#define atomic_set(atomic,val)	(((atomic)->value) = (val)) // 设置原子变量的初始值
+
+typedef struct
+{
+    volatile long value;
+} atomic_t;
+
+/**
+ * @brief 原子变量增加值
+ *
+ * @param ato 原子变量对象
+ * @param val 要增加的值
+ */
+static inline void atomic_add(atomic_t *ato, long val)
+{
+    asm volatile("lock addq %1, %0 \n\t"
+                 : "=m"(ato->value)
+                 : "m"(val)
+                 : "memory");
+}
+
+/**
+ * @brief 原子变量减少值
+ *
+ * @param ato 原子变量对象
+ * @param val 要减少的值
+ */
+static inline void atomic_sub(atomic_t *ato, long val)
+{
+    asm volatile("lock subq %1, %0  \n\t"
+                 : "=m"(ato->value)
+                 : "m"(val)
+                 : "memory");
+}
+
+/**
+ * @brief 原子变量自增
+ *
+ * @param ato 原子变量对象
+ */
+static inline void atomic_inc(atomic_t *ato)
+{
+    asm volatile("lock incq %0   \n\t"
+                 : "=m"(ato->value)
+                 : "m"(ato->value)
+                 : "memory");
+}
+
+/**
+ * @brief 原子变量自减
+ *
+ * @param ato 原子变量对象
+ */
+static inline void atomic_dec(atomic_t *ato)
+{
+    asm volatile("lock decq %0 \n\t"
+                 : "=m"(ato->value)
+                 : "m"(ato->value)
+                 : "memory");
+}
+
+/**
+ * @brief 设置原子变量的mask
+ *
+ * @param ato 原子变量对象
+ */
+static inline void atomic_set_mask(atomic_t *ato, long mask)
+{
+    __asm__ __volatile__("lock	orq	%1,	%0	\n\t"
+                         : "=m"(ato->value)
+                         : "r"(mask)
+                         : "memory");
+}
+
+/**
+ * @brief 清除原子变量的mask
+ *
+ * @param ato 原子变量对象
+ */
+static inline void atomic_clear_mask(atomic_t *ato, long mask)
+{
+    __asm__ __volatile__("lock	andq	%1,	%0	\n\t"
+                         : "=m"(ato->value)
+                         : "r"(mask)
+                         : "memory");
+}

kernel/process/semaphore.h

@@ -0,0 +1,101 @@
+/**
+ * @file semaphore.h
+ * @author fslngjin (lonjin@RinGoTek.cn)
+ * @brief 信号量
+ * @version 0.1
+ * @date 2022-04-12
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+
+#pragma once
+#include <process/atomic.h>
+
+#include <process/process.h>
+#include <sched/sched.h>
+
+/**
+ * @brief 信号量的等待队列
+ *
+ */
+typedef struct
+{
+    struct List wait_list;
+    struct process_control_block *pcb;
+} wait_queue_node_t;
+
+/**
+ * @brief 初始化信号量的等待队列
+ *
+ * @param wait_queue 等待队列
+ * @param pcb pcb
+ */
+void wait_queue_init(wait_queue_node_t *wait_queue, struct process_control_block *pcb)
+{
+    list_init(&wait_queue->wait_list);
+    wait_queue->pcb = pcb;
+}
+
+/**
+ * @brief 信号量的结构体
+ *
+ */
+typedef struct
+{
+    atomic_t counter;
+    wait_queue_node_t wait_queue;
+} semaphore_t;
+
+/**
+ * @brief 初始化信号量
+ *
+ * @param sema 信号量对象
+ * @param count 信号量的初始值
+ */
+void semaphore_init(semaphore_t *sema, ul count)
+{
+    atomic_set(&sema->counter, count);
+    wait_queue_init(&sema->wait_queue, NULL);
+}
+
+/**
+ * @brief 信号量down
+ *
+ * @param sema
+ */
+void semaphore_down(semaphore_t *sema)
+{
+    if (atomic_read(&sema->counter) > 0) // 信号量大于0，资源充足
+        atomic_dec(&sema->counter);
+    else // 资源不足，进程休眠
+    {
+        // 将当前进程加入信号量的等待队列
+        wait_queue_node_t wait;
+        wait_queue_init(&wait, current_pcb);
+
+        current_pcb->state = PROC_UNINTERRUPTIBLE;
+
+        list_append(&sema->wait_queue.wait_list, &wait.wait_list);
+
+        // 执行调度
+        sched_cfs();
+    }
+}
+
+void semaphore_up(semaphore_t *sema)
+{
+    if (list_empty(&sema->wait_queue.wait_list)) // 没有进程在等待资源
+    {
+        atomic_inc(&sema->counter);
+    }
+    else    // 有进程在等待资源，唤醒进程
+    {
+
+        wait_queue_node_t *wq = container_of(list_next(&sema->wait_queue.wait_list), wait_queue_node_t, wait_list);
+        list_del(&wq->wait_list);
+
+        wq->pcb->state = PROC_RUNNING;
+        sched_cfs_enqueue(wq->pcb);
+    }
+}

kernel/process/spinlock.h

@@ -8,6 +8,7 @@
  * @copyright Copyright (c) 2022
  *
  */
+#pragma once
 #include "../common/glib.h"
 
 /**

kernel/syscall/syscall.c

@@ -77,10 +77,10 @@ long enter_syscall_int(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg
 ul sys_printf(struct pt_regs *regs)
 {
 
-    // if(regs->r9 == 0 &&regs->r10 == 0)
+    if(regs->r9 == 0 &&regs->r10 == 0)
-    //     printk((char*)regs->r8);
+         printk((char*)regs->r8);
-    // else printk_color(regs->r9, regs->r10, (char*)regs->r8);
+     else printk_color(regs->r9, regs->r10, (char*)regs->r8);
-    printk_color(BLACK, WHITE, (char *)regs->r8);
+    // printk_color(BLACK, WHITE, (char *)regs->r8);
 
     return 0;
 }