1 #include <linux/init.h>
  2 #include <linux/thread_info.h>
  3 #include <linux/module.h>
  4 #include <linux/sched.h>
  5 #include <linux/errno.h>
  6 #include <linux/kernel.h>
  7 #include <linux/module.h>
  8 #include <linux/slab.h>
  9 #include <linux/input.h>
 10
 
 #include <linux/init.h>
 11 #include <linux/serio.h>
 12 #include <linux/delay.h>
 13 #include <linux/clk.h>
 14 #include <linux/miscdevice.h>
 15 #include <linux/io.h>
 16 #include <linux/ioport.h>
 17 #include <linux/vmalloc.h>
 18 #include <linux/dma-mapping.h>
 19
 
 #include <linux/export.h>
 20 #include <linux/gfp.h>
 21 
 22 #include <asm/dma-mapping.h>
 23 #include <asm/uaccess.h>
 24 
 25 #include <linux/gpio.h>
 26 #include <mach/gpio.h>
 27 #include <plat/gpio-cfg.h>
 28 
 29 MODULE_LICENSE("GPL");
 30 MODULE_AUTHOR("
 
bunfly");
 31 
 32 
 33 unsigned long vmalloc_to_pfn(const void *vmalloc_addr);
 34 int test_init()
 35 {
 36     int ret = 0;
 37     unsigned char *vmalloc_virt, *normal_virt, *phys;
 38     unsigned long pfn;
 39 
 40     printk("KERNEL SPACE: init\n");
 41 
 42     printk("KERNEL SPACE: read from d0003000: %s\n", 0xd0003000);
 43     //讀出d0003000虛擬地址裡面的資料
 44 
 45     normal_virt = kmalloc(40, GFP_KERNEL);
 46     //kmalloc分配一段虛擬地址，大小，睡眠不可中斷
 47 
 48     phys = virt_to_phys(normal_virt);
 49     printk("KMAKLLOC: kmalloc virt: %p <==> phys: %p\n", normal_virt, phys);
 50 
 51     kfree(normal_virt);
 52 
 53     //分配頁
 54     //--------------------------------------
 55     vmalloc_virt = vmalloc(500);
 56     //vmalloc分配記憶體
 57 
 58     pfn = vmalloc_to_pfn(vmalloc_virt);
 59     //頁分配
 60     phys = (pfn << 12) | ((unsigned long)vmalloc_virt & 0xfff);
 61     //將頁地址轉換成實體地址
 62     normal_virt = phys_to_virt(phys);
 63     //再將實體地址轉換成虛擬地址
 64     printk("VMALLOC: vmalloc_virt = %p, normal_virt = %p\n", vmalloc_virt, normal_virt);
 65 
 66     //dma分配
 67     normal_virt = dma_alloc_coherent(NULL, 1024, &phys, GFP_KERNEL);
 68     printk("DMA: vmalloc_virt = %p, normal_virt = %p\n", vmalloc_virt,phys);
 69     dma_free_coherent(NULL, 1024, normal_virt, phys);
 70 
 71     vfree(vmalloc_virt);
 72     return 0;
 73 }
 74 
 75 void test_exit()
 76 {
 77     printk("KERNEL SPACE: exit\n");
 78 }
 79 
 80 module_init(test_init);
 81 module_exit(test_exit);
 82 
~                                                                                                                                                                                                                                                                                                                                                                                                                                  
~                                                                                                                                                                                                                                                                                                                                                                                                                                  
~