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/*
kmalloc can apply 128KB memory only. This func support any continous memory allocate more than 2MB.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#define KMEM_PAGES //apply more than one page
#define KMEM_DEBUG //debug message switch
/*
// Pure 2^n version of get_order
static __inline__ __attribute_const__ int get_order(unsigned long size)
{
int order;
size = (size - 1) >> (PAGE_SHIFT - 1);
order = -1;
do {
size >>= 1;
order++;
} while (size);
return order;
}
*/
/*
alloc memory for DMA using in kernel space.
*/
void *kmem_alloc(size_t size, dma_addr_t *dma_handle, unsigned long flags)
{
struct page *page; //start page address
void *cpu_addr = NULL; //cpu io address
struct page *end; //end of pages
unsigned int PageOrder=0;
size = PAGE_ALIGN(size); //must be times of 4KB
PageOrder=get_order(size);
#ifdef CONFIG_ISOLATE_HIGHMEM //allocate in high memory
page = alloc_pages(GFP_HIGHUSER, PageOrder);
#else //allocate from low memory
page = alloc_pages(GFP_KERNEL, PageOrder); //get_order(size) means how many 4KB page do you want to apply. 2^n
#end
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