forked from luck/tmp_suning_uos_patched
c1f64a5800
On Tue, 27 May 2008, Linus Torvalds wrote: > > Expecting people to fix up all drivers is simply not going to happen. And > serializing things shouldn't be *that* expensive. People who cannot take > the expense can continue to use the magic __raw_writel() etc stuff. Of course, for non-x86, you kind of have to expect drivers to be well-behaved, so non-x86 can probably avoid this simply because there are less relevant drivers involved. Here's a UNTESTED patch for x86 that may or may not compile and work, and which serializes (on a compiler level) the IO accesses against regular memory accesses. __read[bwlq]()/__write[bwlq]() are not serialized with a :"memory" barrier, although since they still use "asm volatile" I suspect that i practice they are probably serial too. Did not look very closely at any generated code (only did a trivial test to see that the code looks *roughly* correct). Signed-off-by: Ingo Molnar <mingo@elte.hu>
247 lines
6.2 KiB
C
247 lines
6.2 KiB
C
#ifndef _ASM_IO_H
|
|
#define _ASM_IO_H
|
|
|
|
|
|
/*
|
|
* This file contains the definitions for the x86 IO instructions
|
|
* inb/inw/inl/outb/outw/outl and the "string versions" of the same
|
|
* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
|
|
* versions of the single-IO instructions (inb_p/inw_p/..).
|
|
*
|
|
* This file is not meant to be obfuscating: it's just complicated
|
|
* to (a) handle it all in a way that makes gcc able to optimize it
|
|
* as well as possible and (b) trying to avoid writing the same thing
|
|
* over and over again with slight variations and possibly making a
|
|
* mistake somewhere.
|
|
*/
|
|
|
|
/*
|
|
* Thanks to James van Artsdalen for a better timing-fix than
|
|
* the two short jumps: using outb's to a nonexistent port seems
|
|
* to guarantee better timings even on fast machines.
|
|
*
|
|
* On the other hand, I'd like to be sure of a non-existent port:
|
|
* I feel a bit unsafe about using 0x80 (should be safe, though)
|
|
*
|
|
* Linus
|
|
*/
|
|
|
|
/*
|
|
* Bit simplified and optimized by Jan Hubicka
|
|
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
|
|
*
|
|
* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
|
|
* isa_read[wl] and isa_write[wl] fixed
|
|
* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
|
*/
|
|
|
|
extern void native_io_delay(void);
|
|
|
|
extern int io_delay_type;
|
|
extern void io_delay_init(void);
|
|
|
|
#if defined(CONFIG_PARAVIRT)
|
|
#include <asm/paravirt.h>
|
|
#else
|
|
|
|
static inline void slow_down_io(void)
|
|
{
|
|
native_io_delay();
|
|
#ifdef REALLY_SLOW_IO
|
|
native_io_delay();
|
|
native_io_delay();
|
|
native_io_delay();
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Talk about misusing macros..
|
|
*/
|
|
#define __OUT1(s, x) \
|
|
static inline void out##s(unsigned x value, unsigned short port) {
|
|
|
|
#define __OUT2(s, s1, s2) \
|
|
asm volatile ("out" #s " %" s1 "0,%" s2 "1"
|
|
|
|
#ifndef REALLY_SLOW_IO
|
|
#define REALLY_SLOW_IO
|
|
#define UNSET_REALLY_SLOW_IO
|
|
#endif
|
|
|
|
#define __OUT(s, s1, x) \
|
|
__OUT1(s, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
|
|
} \
|
|
__OUT1(s##_p, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
|
|
slow_down_io(); \
|
|
}
|
|
|
|
#define __IN1(s) \
|
|
static inline RETURN_TYPE in##s(unsigned short port) \
|
|
{ \
|
|
RETURN_TYPE _v;
|
|
|
|
#define __IN2(s, s1, s2) \
|
|
asm volatile ("in" #s " %" s2 "1,%" s1 "0"
|
|
|
|
#define __IN(s, s1, i...) \
|
|
__IN1(s) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); \
|
|
return _v; \
|
|
} \
|
|
__IN1(s##_p) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); \
|
|
slow_down_io(); \
|
|
return _v; }
|
|
|
|
#ifdef UNSET_REALLY_SLOW_IO
|
|
#undef REALLY_SLOW_IO
|
|
#endif
|
|
|
|
#define __INS(s) \
|
|
static inline void ins##s(unsigned short port, void *addr, \
|
|
unsigned long count) \
|
|
{ \
|
|
asm volatile ("rep ; ins" #s \
|
|
: "=D" (addr), "=c" (count) \
|
|
: "d" (port), "0" (addr), "1" (count)); \
|
|
}
|
|
|
|
#define __OUTS(s) \
|
|
static inline void outs##s(unsigned short port, const void *addr, \
|
|
unsigned long count) \
|
|
{ \
|
|
asm volatile ("rep ; outs" #s \
|
|
: "=S" (addr), "=c" (count) \
|
|
: "d" (port), "0" (addr), "1" (count)); \
|
|
}
|
|
|
|
#define RETURN_TYPE unsigned char
|
|
__IN(b, "")
|
|
#undef RETURN_TYPE
|
|
#define RETURN_TYPE unsigned short
|
|
__IN(w, "")
|
|
#undef RETURN_TYPE
|
|
#define RETURN_TYPE unsigned int
|
|
__IN(l, "")
|
|
#undef RETURN_TYPE
|
|
|
|
__OUT(b, "b", char)
|
|
__OUT(w, "w", short)
|
|
__OUT(l, , int)
|
|
|
|
__INS(b)
|
|
__INS(w)
|
|
__INS(l)
|
|
|
|
__OUTS(b)
|
|
__OUTS(w)
|
|
__OUTS(l)
|
|
|
|
#define IO_SPACE_LIMIT 0xffff
|
|
|
|
#if defined(__KERNEL__) && defined(__x86_64__)
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
#ifndef __i386__
|
|
/*
|
|
* Change virtual addresses to physical addresses and vv.
|
|
* These are pretty trivial
|
|
*/
|
|
static inline unsigned long virt_to_phys(volatile void *address)
|
|
{
|
|
return __pa(address);
|
|
}
|
|
|
|
static inline void *phys_to_virt(unsigned long address)
|
|
{
|
|
return __va(address);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Change "struct page" to physical address.
|
|
*/
|
|
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
|
|
|
|
#include <asm-generic/iomap.h>
|
|
|
|
extern void *early_ioremap(unsigned long addr, unsigned long size);
|
|
extern void early_iounmap(void *addr, unsigned long size);
|
|
|
|
/*
|
|
* This one maps high address device memory and turns off caching for that area.
|
|
* it's useful if some control registers are in such an area and write combining
|
|
* or read caching is not desirable:
|
|
*/
|
|
extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
|
|
extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
|
|
|
|
/*
|
|
* The default ioremap() behavior is non-cached:
|
|
*/
|
|
static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
|
|
{
|
|
return ioremap_nocache(offset, size);
|
|
}
|
|
|
|
extern void iounmap(volatile void __iomem *addr);
|
|
|
|
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
|
|
|
|
/*
|
|
* ISA I/O bus memory addresses are 1:1 with the physical address.
|
|
*/
|
|
#define isa_virt_to_bus virt_to_phys
|
|
#define isa_page_to_bus page_to_phys
|
|
#define isa_bus_to_virt phys_to_virt
|
|
|
|
/*
|
|
* However PCI ones are not necessarily 1:1 and therefore these interfaces
|
|
* are forbidden in portable PCI drivers.
|
|
*
|
|
* Allow them on x86 for legacy drivers, though.
|
|
*/
|
|
#define virt_to_bus virt_to_phys
|
|
#define bus_to_virt phys_to_virt
|
|
|
|
void __memcpy_fromio(void *, unsigned long, unsigned);
|
|
void __memcpy_toio(unsigned long, const void *, unsigned);
|
|
|
|
static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
|
|
unsigned len)
|
|
{
|
|
__memcpy_fromio(to, (unsigned long)from, len);
|
|
}
|
|
|
|
static inline void memcpy_toio(volatile void __iomem *to, const void *from,
|
|
unsigned len)
|
|
{
|
|
__memcpy_toio((unsigned long)to, from, len);
|
|
}
|
|
|
|
void memset_io(volatile void __iomem *a, int b, size_t c);
|
|
|
|
/*
|
|
* ISA space is 'always mapped' on a typical x86 system, no need to
|
|
* explicitly ioremap() it. The fact that the ISA IO space is mapped
|
|
* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
|
|
* are physical addresses. The following constant pointer can be
|
|
* used as the IO-area pointer (it can be iounmapped as well, so the
|
|
* analogy with PCI is quite large):
|
|
*/
|
|
#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
|
|
|
|
#define flush_write_buffers()
|
|
|
|
extern int iommu_bio_merge;
|
|
#define BIO_VMERGE_BOUNDARY iommu_bio_merge
|
|
|
|
/*
|
|
* Convert a virtual cached pointer to an uncached pointer
|
|
*/
|
|
#define xlate_dev_kmem_ptr(p) p
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|