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/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
****************************************************************************
* (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
****************************************************************************
*
* File: mm.h
* Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
* Changes:
*
* Date: Aug 2003
*
* Environment:
* Description:
*
****************************************************************************
* $Id: h-insert.h,v 1.4 2002/11/08 16:03:55 rn Exp $
****************************************************************************
*/
#ifndef _MM_H_
#define _MM_H_
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
extern unsigned long *phys_to_machine_mapping;
#define pfn_to_mfn(_pfn) (phys_to_machine_mapping[(_pfn)])
#define mfn_to_pfn(_mfn) (machine_to_phys_mapping[(_mfn)])
static inline unsigned long phys_to_machine(unsigned long phys)
{
unsigned long machine = pfn_to_mfn(phys >> PAGE_SHIFT);
machine = (machine << PAGE_SHIFT) | (phys & ~PAGE_MASK);
return machine;
}
static inline unsigned long machine_to_phys(unsigned long machine)
{
unsigned long phys = mfn_to_pfn(machine >> PAGE_SHIFT);
phys = (phys << PAGE_SHIFT) | (machine & ~PAGE_MASK);
return phys;
}
/* VIRT <-> MACHINE conversion */
#define virt_to_machine(_a) (phys_to_machine(__pa(_a)))
#define machine_to_virt(_m) (__va(machine_to_phys(_m)))
/*
* This handles the memory map.. We could make this a config
* option, but too many people screw it up, and too few need
* it.
*
* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
* a virtual address space of one gigabyte, which limits the
* amount of physical memory you can use to about 950MB.
*
* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
* and CONFIG_HIGHMEM64G options in the kernel configuration.
*/
#define __PAGE_OFFSET (0xC0000000)
#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
/* prototypes */
void init_mm();
void release_bytes_to_allocator(unsigned long min, unsigned long max);
unsigned long __get_free_pages(int order);
void __free_pages(unsigned long p, int order);
#define get_free_pages(_o) (__get_free_pages(_o))
#define get_free_page() (__get_free_pages(0))
#define free_pages(_p,_o) (__free_pages(_p,_o))
#define free_page(_p) (__free_pages(_p,0))
static __inline__ int get_order(unsigned long size)
{
int order;
size = (size-1) >> (PAGE_SHIFT-1);
order = -1;
do {
size >>= 1;
order++;
} while (size);
return order;
}
#endif /* _MM_H_ */
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