原始版本

RT_Thread/libcpu/ia32/interrupt.c

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015/9/15      Bernard      Update to new interrupt framework.
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#include <bsp.h>
+
+extern void rt_hw_idt_init(void);
+
+/* exception and interrupt handler table */
+struct rt_irq_desc irq_desc[MAX_HANDLERS];
+
+rt_uint16_t irq_mask_8259A = 0xFFFF;
+
+void rt_hw_interrupt_handle(int vector, void* param);
+
+/**
+ * @addtogroup I386
+ */
+/*@{*/
+
+/**
+ * This function initializes 8259 interrupt controller
+ */
+void rt_hw_pic_init()
+{
+    outb(IO_PIC1, 0x11);
+    outb(IO_PIC1+1, IRQ_OFFSET);
+    outb(IO_PIC1+1, 1<<IRQ_SLAVE);
+    outb(IO_PIC1+1, 0x3);
+    outb(IO_PIC1+1, 0xff);
+    outb(IO_PIC1, 0x68);
+    outb(IO_PIC1, 0x0a);
+    outb(IO_PIC2, 0x11);
+    outb(IO_PIC2+1, IRQ_OFFSET + 8);
+    outb(IO_PIC2+1, IRQ_SLAVE);
+    outb(IO_PIC2+1, 0x3);
+    outb(IO_PIC2+1, 0xff);
+    outb(IO_PIC2, 0x68);
+    outb(IO_PIC2, 0x0a);
+
+    if (irq_mask_8259A != 0xFFFF)
+    {
+        outb(IO_PIC1+1, (char)irq_mask_8259A);
+        outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
+    }
+}
+
+void rt_hw_interrupt_handle(int vector, void* param)
+{
+    rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
+}
+
+void rt_hw_isr(int vector)
+{
+    if (vector < MAX_HANDLERS)
+    {
+        irq_desc[vector].handler(vector, irq_desc[vector].param);
+    }
+}
+
+/**
+ * This function initializes interrupt descript table and 8259 interrupt controller
+ *
+ */
+void rt_hw_interrupt_init(void)
+{
+    int idx;
+
+    rt_hw_idt_init();
+    rt_hw_pic_init();
+
+    /* init exceptions table */
+    for(idx=0; idx < MAX_HANDLERS; idx++)
+    {
+        irq_desc[idx].handler = (rt_isr_handler_t)rt_hw_interrupt_handle;
+        irq_desc[idx].param = RT_NULL;
+#ifdef RT_USING_INTERRUPT_INFO
+        rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, "default");
+        irq_desc[idx].counter = 0;
+#endif
+    }
+}
+
+void rt_hw_interrupt_umask(int vector)
+{
+    irq_mask_8259A = irq_mask_8259A&~(1<<vector);
+    outb(IO_PIC1+1, (char)irq_mask_8259A);
+    outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
+}
+
+void rt_hw_interrupt_mask(int vector)
+{
+    irq_mask_8259A = irq_mask_8259A | (1<<vector);
+    outb(IO_PIC1+1, (char)irq_mask_8259A);
+    outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
+}
+
+rt_isr_handler_t rt_hw_interrupt_install(int              vector,
+                                         rt_isr_handler_t handler,
+                                         void            *param,
+                                         const char      *name)
+{
+    rt_isr_handler_t old_handler = RT_NULL;
+
+    if(vector < MAX_HANDLERS)
+    {
+        old_handler = irq_desc[vector].handler;
+        if (handler != RT_NULL)
+        {
+            irq_desc[vector].handler = (rt_isr_handler_t)handler;
+            irq_desc[vector].param = param;
+#ifdef RT_USING_INTERRUPT_INFO
+            rt_snprintf(irq_desc[vector].name, RT_NAME_MAX - 1, "%s", name);
+            irq_desc[vector].counter = 0;
+#endif
+        }
+    }
+
+    return old_handler;
+}
+
+/*@}*/