#include "kvmem.h"#include <linux/vmalloc.h>/* allocate user space mmapable block of memory in the kernel space */void * rvmalloc(unsigned long size){	void * mem;	unsigned long adr, page;        	mem=vmalloc(size);	if (mem) 	{		memset(mem, 0, size); /* Clear the ram out, no junk to the user */	        adr=(unsigned long) mem;		while (size > 0)                 {#ifdef MAP_NR	                page = kvirt_to_phys(adr);			mem_map_reserve(MAP_NR(phys_to_virt(page)));#else	                page = kvirt_to_pa(adr);			mem_map_reserve(virt_to_page(__va(page)));#endif			adr+=PAGE_SIZE;			size-=PAGE_SIZE;		}	}	return mem;}void rvfree(void * mem, unsigned long size){        unsigned long adr, page;        	if (mem) 	{	        adr=(unsigned long) mem;		while (size > 0)                 {#ifdef MAP_NR	                page = kvirt_to_phys(adr);			mem_map_unreserve(MAP_NR(phys_to_virt(page)));#else	                page = kvirt_to_pa(adr);			mem_map_unreserve(virt_to_page(__va(page)));#endif			adr+=PAGE_SIZE;			size-=PAGE_SIZE;		}		vfree(mem);	}}/* this function will map (fragment of) rvmalloc'ed memory area to user space */int rvmmap(void *mem, unsigned memsize, struct vm_area_struct *vma) {	unsigned long pos, size, start=vma->vm_start;#if LINUX_VERSION_CODE < 0x20300	unsigned long offset = vma->vm_offset;#else	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;#endif	/* this is not time critical code, so we check the arguments */	/* offset HAS to be checked (and is checked)*/	if (offset<0)		return -EFAULT;	size = vma->vm_end - vma->vm_start;	if (size + offset > memsize)		return -EFAULT;	pos = (unsigned long) mem + offset;	if (pos%PAGE_SIZE || start%PAGE_SIZE || size%PAGE_SIZE)		return -EFAULT;			while (size>0) {		if (remap_page_range(start,kvirt_to_phys(pos), PAGE_SIZE, 			vma->vm_page_prot )) {			/* FIXME: what should we do here to unmap previous pages ?*/			printk(KERN_ERR "rvmmap failed: vm_start=0x%lx, vm_end=0x%lx, size=0x%lx, pos=0x%lx; please report to motyl@stan.chemie.unibas.ch\n",vma->vm_start,vma->vm_end,size,pos);			return -EFAULT;		}		pos+=PAGE_SIZE;		start+=PAGE_SIZE;		size-=PAGE_SIZE;	}	return 0;}