8a016596a5
unicore32 supports STRICT_DEVMEM, so it needs devmem_is_allowed(), like
some of other architectures have done (e.g. arm, powerpc, x86 ...).
The related error with allmodconfig:
CC drivers/char/mem.o
drivers/char/mem.c: In function ârange_is_allowedâ:
drivers/char/mem.c:69: error: implicit declaration of function âdevmem_is_allowedâ
make[2]: *** [drivers/char/mem.o] Error 1
make[1]: *** [drivers/char] Error 2
make: *** [drivers] Error 2
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Acked-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
Signed-off-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/*
|
|
* linux/arch/unicore32/include/asm/io.h
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* 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 __UNICORE_IO_H__
|
|
#define __UNICORE_IO_H__
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/byteorder.h>
|
|
#include <asm/memory.h>
|
|
|
|
#define PCI_IOBASE PKUNITY_PCILIO_BASE
|
|
#include <asm-generic/io.h>
|
|
|
|
/*
|
|
* __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address.
|
|
*/
|
|
extern void __iomem *__uc32_ioremap(unsigned long, size_t);
|
|
extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
|
|
extern void __uc32_iounmap(volatile void __iomem *addr);
|
|
|
|
/*
|
|
* ioremap and friends.
|
|
*
|
|
* ioremap takes a PCI memory address, as specified in
|
|
* Documentation/io-mapping.txt.
|
|
*
|
|
*/
|
|
#define ioremap(cookie, size) __uc32_ioremap(cookie, size)
|
|
#define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size)
|
|
#define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size)
|
|
#define iounmap(cookie) __uc32_iounmap(cookie)
|
|
|
|
#define readb_relaxed readb
|
|
#define readw_relaxed readw
|
|
#define readl_relaxed readl
|
|
|
|
#define HAVE_ARCH_PIO_SIZE
|
|
#define PIO_OFFSET (unsigned int)(PCI_IOBASE)
|
|
#define PIO_MASK (unsigned int)(IO_SPACE_LIMIT)
|
|
#define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1)
|
|
|
|
#ifdef CONFIG_STRICT_DEVMEM
|
|
|
|
#include <linux/ioport.h>
|
|
#include <linux/mm.h>
|
|
|
|
/*
|
|
* devmem_is_allowed() checks to see if /dev/mem access to a certain
|
|
* address is valid. The argument is a physical page number.
|
|
* We mimic x86 here by disallowing access to system RAM as well as
|
|
* device-exclusive MMIO regions. This effectively disable read()/write()
|
|
* on /dev/mem.
|
|
*/
|
|
static inline int devmem_is_allowed(unsigned long pfn)
|
|
{
|
|
if (iomem_is_exclusive(pfn << PAGE_SHIFT))
|
|
return 0;
|
|
if (!page_is_ram(pfn))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_STRICT_DEVMEM */
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __UNICORE_IO_H__ */
|