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/**
* Header file of MobiCore Driver Kernel Module.
*
* @addtogroup MobiCore_Driver_Kernel_Module
* @{
* Wrapper for Linux API
* @file
*
* Some convenient wrappers for memory functions
*
* <!-- Copyright Giesecke & Devrient GmbH 2009-2012 -->
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _MC_DRV_MODULE_LINUX_API_H_
#define _MC_DRV_MODULE_LINUX_API_H_
#include <linux/version.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/highmem.h>
#include <linux/kthread.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/sizes.h>
#include <asm/pgtable.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
#include <linux/timer.h>
/* make some nice types */
#if !defined(TRUE)
#define TRUE (1 == 1)
#endif
#if !defined(FALSE)
#define FALSE (1 != 1)
#endif
/* Linux GCC modifiers */
#if !defined(__init)
#warning "missing definition: __init"
/* define a dummy */
#define __init
#endif
#if !defined(__exit)
#warning "missing definition: __exit"
/* define a dummy */
#define __exit
#endif
#if !defined(__must_check)
#warning "missing definition: __must_check"
/* define a dummy */
#define __must_check
#endif
#if !defined(__user)
#warning "missing definition: __user"
/* define a dummy */
#define __user
#endif
#define INVALID_ORDER ((unsigned int)(-1))
/*----------------------------------------------------------------------------*/
/* get start address of the 4 KiB page where the given addres is located in. */
static inline void *getPageStart(
void *addr
)
{
return (void *)(((unsigned long)(addr)) & PAGE_MASK);
}
/*----------------------------------------------------------------------------*/
/* get offset into the 4 KiB page where the given addres is located in. */
static inline unsigned int getOffsetInPage(
void *addr
)
{
return (unsigned int)(((unsigned long)(addr)) & (~PAGE_MASK));
}
/*----------------------------------------------------------------------------*/
/* get number of pages for a given buffer. */
static inline unsigned int getNrOfPagesForBuffer(
void *addrStart, /* may be null */
unsigned int len
)
{
/* calculate used number of pages. Example:
offset+size newSize+PAGE_SIZE-1 nrOfPages
0 4095 0
1 4096 1
4095 8190 1
4096 8191 1
4097 8192 2 */
return (getOffsetInPage(addrStart) + len + PAGE_SIZE-1) / PAGE_SIZE;
}
/*----------------------------------------------------------------------------*/
/**
* convert a given size to page order, which is equivalent to finding log_2(x).
* The maximum for order was 5 in Linux 2.0 corresponding to 32 pages.
* Later versions allow 9 corresponding to 512 pages, which is 2 MB on
* most platforms). Anyway, the bigger order is, the more likely it is
* that the allocation will fail.
* Size 0 1 4097 8193 12289 24577 28673 40961 61441
* Pages - 1 2 3 4 7 8 15 16
* Order INVALID_ORDER 0 1 1 2 2 3 3 4
*
* @param size
* @return order
*/
static inline unsigned int sizeToOrder(
unsigned int size
)
{
unsigned int order = INVALID_ORDER;
if (0 != size) {
/* ARMv5 as a CLZ instruction which count the leading zeros of
the binary representation of a value. It return a value
between 0 and 32.
Value 0 1 2 3 4 5 6 7 8 9 10 ...
CLZ 32 31 30 30 29 29 29 29 28 28 28 ...
We have excluded Size==0 before, so this is safe. */
order = __builtin_clz(
getNrOfPagesForBuffer(NULL, size));
/* there is a size overflow in getNrOfPagesForBuffer when
* the size is too large */
if (unlikely(order > 31))
return INVALID_ORDER;
order = 31 - order;
/* above algorithm rounds down: clz(5)=2 instead of 3 */
/* quick correction to fix it: */
if (((1<<order)*PAGE_SIZE) < size)
order++;
}
return order;
}
/* magic linux macro */
#if !defined(list_for_each_entry)
/* stop compiler */
#error "missing macro: list_for_each_entry()"
/* define a dummy */
#define list_for_each_entry(a, b, c) if (0)
#endif
/*----------------------------------------------------------------------------*/
/* return the page frame number of an address */
static inline unsigned int addrToPfn(
void *addr
)
{
/* there is no real API for this */
return ((unsigned int)(addr)) >> PAGE_SHIFT;
}
/*----------------------------------------------------------------------------*/
/* return the address of a page frame number */
static inline void *pfnToAddr(
unsigned int pfn
)
{
/* there is no real API for this */
return (void *)(pfn << PAGE_SHIFT);
}
#endif /* _MC_DRV_MODULE_LINUX_API_H_ */
/** @} */
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