Created
May 6, 2019 02:31
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#include <linux/init.h> | |
#include <linux/module.h> | |
#include <linux/slab.h> | |
#include <linux/mm.h> | |
#include <linux/moduleparam.h> | |
#include <asm/io.h> | |
static void *virtual_addr; | |
static phys_addr_t physical_addr; | |
int size = 1024; /* allocate 1024 bytes */ | |
static int alloc_init(void) | |
{ | |
virtual_addr = kmalloc(size,GFP_ATOMIC); | |
if(!virtual_addr) { | |
/* handle error */ | |
pr_err("memory allocation failed\n"); | |
return -ENOMEM; | |
} else { | |
pr_info("Memory allocated successfully Virtual address:%p\n", virtual_addr); | |
physical_addr = virt_to_phys(virtual_addr); | |
pr_info("Physical address:%llx\n", physical_addr); | |
pr_info("Virtual address:%p\n", phys_to_virt(physical_addr)); | |
} | |
return 0; | |
} | |
static void alloc_exit(void) | |
{ | |
kfree(virtual_addr); | |
pr_info("Memory freed\n"); | |
} | |
module_init(alloc_init); | |
module_exit(alloc_exit); | |
MODULE_LICENSE("GPL"); |
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