new file 100644
/*
* Portions Copyright 2008, 2009 and 2011 VMware, Inc.
*/
#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>
#define __SLOW_DOWN_IO "\noutb %%al,$0x80"
#ifdef REALLY_SLOW_IO
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
#else
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
#endif
* In case of any code change below, make sure you
* go and update the corresponding documentation.
* The documentation file can be found at
* vmkdrivers/src_92/doc/dummyDefs.doc
* outb
* outb_p
* outw
* outl
* outsw
* Talk about misusing macros..
#define __OUT1(s,x) \
static inline void out##s(unsigned x value, unsigned short port) {
#if defined(__VMKLNX__)
#define __OUT2(s,s1,s2) \
vmk_CPUEnsureClearDF(); \
__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
#else /* !defined(__VMKLNX__) */
#endif /* defined(__VMKLNX__) */
#define __OUT(s,s1,x) \
__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
#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") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
#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)); }
{ __asm__ __volatile__ ("rep ; ins" #s \
#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)); }
{ __asm__ __volatile__ ("rep ; outs" #s \
#define RETURN_TYPE unsigned char
__IN(b,"")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned short
__IN(w,"")
#define RETURN_TYPE unsigned int
__IN(l,"")
__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__) && __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);
* Change "struct page" to page number.
/**
* phys_to_page - machine address to page handle
* @maddr : machine address
* ESX Deviation Notes:
* The resulting page handle cannot be derefenced. The returned value
* doesn't correspond to an address of page structure but to the actual page
* number. This page handle needs to be handled through the page api only.
/* _VMKLNX_CODECHECK_: phys_to_page */
#define phys_to_page(maddr) ((struct page *)pfn_to_page(maddr >> PAGE_SHIFT))
* page_to_phys - page handle to machine address
* @page : page handle
* Gets the machine address that corresponds to the page parameter
* None.
* RETURN VALUE:
* A machine address
/* _VMKLNX_CODECHECK_: page_to_phys */
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
#include <asm-generic/iomap.h>
extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
* ioremap - perform a cachable mapping of a physically contiguous range
* @offset: physical address to map
* @size: number of bytes to map
* Map in a physically contiguous range into kernel virtual memory and
* get a pointer to the mapped region. The region is mapped cacheable.
/* _VMKLNX_CODECHECK_: ioremap */
static inline void __iomem * ioremap (unsigned long offset, unsigned long size)
return __ioremap(offset, size, 0);
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 (unsigned long offset, unsigned long size);
extern void iounmap(volatile void __iomem *addr);
* 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.
#if !defined(__VMKLNX__)
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently. On the x86 architecture, we just read/write the
* memory location directly.
* __readb - Read a byte from specified address
* @addr: memory address to read from
* Reads a byte from a memory location that is mapped to a
* device.
* An 8-bit unsigned byte value
* SEE ALSO:
* readb
/* _VMKLNX_CODECHECK_: __readb */
static inline __u8 __readb(const volatile void __iomem *addr)
return *(__force volatile __u8 *)addr;
* __readw - Read a word (16 bits) from specified address
* Reads a word (16 bits) from a memory location
* that is mapped to a device
* A 16-bit unsigned short word value
* readw
/* _VMKLNX_CODECHECK_: __readw */
static inline __u16 __readw(const volatile void __iomem *addr)
return *(__force volatile __u16 *)addr;
* __readl - Read a long (32 bits) from specified address
* Reads a long (32 bits) from a memory location that is
* mapped to a device
* A 32-bit unsigned long word value
* readl
/* _VMKLNX_CODECHECK_: __readl */
static __always_inline __u32 __readl(const volatile void __iomem *addr)
return *(__force volatile __u32 *)addr;
* __readq - Read a quad word (64 bits) from specified address
* Reads a quad word (64 bits) from a memory location
* A 64-bit unsigned quard word value
* readq
/* _VMKLNX_CODECHECK_: __readq */
static inline __u64 __readq(const volatile void __iomem *addr)
return *(__force volatile __u64 *)addr;
* readb - Read a byte from specified address
* @x: memory address to read from
* Reads a byte from a memory location that is mapped to a device.
* readb is an alias to __readb.
* __readb
/* _VMKLNX_CODECHECK_: readb */
#define readb(x) __readb(x)
* readw - Read a word (16 bits) from specified address
* Reads a word (16 bits) from a memory location that is mapped to a device.
* readw is an alias to __readw.
* __readw
/* _VMKLNX_CODECHECK_: readw */
#define readw(x) __readw(x)
* readl - Read a long (32 bits) from specified address
* Reads a long (32 bits) from a memory location that is mapped to a device.
* readl is an alias to __readl.
* __readl
/* _VMKLNX_CODECHECK_: readl */
#define readl(x) __readl(x)
* readq - Read a quad word (64 bits) from specified address
* Reads a quad word (64 bits) from a memory location that is mapped to a device.
* readq is an alias to __readq.
* __readq
/* _VMKLNX_CODECHECK_: readq */
#define readq(x) __readq(x)
#define readb_relaxed(a) readb(a)
* readw_relaxed - Read a word (16 bits) from specified address
* @a: memory address to read from
* readw_relaxed is an alias to __readw.
* __readw readw
/* _VMKLNX_CODECHECK_: readw_relaxed */
#define readw_relaxed(a) readw(a)
* readl_relaxed - Read a long (32 bits) from specified address
* readw_relaxed is an alias to __readl.
* __readl readl
/* _VMKLNX_CODECHECK_: readl_relaxed */
#define readl_relaxed(a) readl(a)
#define readq_relaxed(a) readq(a)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define __raw_readq readq
#define mmiowb()
* __writel - write an u32 value to I/O device memory
* @b: the u32 value to be written
* @addr: the iomapped memory address that is obtained from ioremap() or from ioremap_nocache()
* This is an internal function. Please call writel instead.
* This function does not return a value.
* ioremap(), ioremap_nocache()
/* _VMKLNX_CODECHECK_: __writel */
static inline void __writel(__u32 b, volatile void __iomem *addr)
*(__force volatile __u32 *)addr = b;
*__writeq - write a u64 value to I/O device memory
* @b: the u64 value to be written
* @addr: the iomapped memory address that is obtained from ioremap()
* or from ioremap_nocache()
* This is an internal function. Please call writeq instead.
/* _VMKLNX_CODECHECK_: __writeq */
static inline void __writeq(__u64 b, volatile void __iomem *addr)
*(__force volatile __u64 *)addr = b;
* __writeb - write an u8 value to I/O device memory
* @b: the u8 value to be written
* This is an internal function. Please call writeb instead.
/* _VMKLNX_CODECHECK_: __writeb */
static inline void __writeb(__u8 b, volatile void __iomem *addr)
*(__force volatile __u8 *)addr = b;
* __writew - write an u16 value to I/O device memory
* @b: the u16 value to be written
* This is an internal function. Please call writew instead.
/* _VMKLNX_CODECHECK_: __writew */
static inline void __writew(__u16 b, volatile void __iomem *addr)
*(__force volatile __u16 *)addr = b;
#define writeq(val,addr) __writeq((val),(addr))
* writel - write an u32 value to I/O device memory
* @val: the u32 value to be written
* @addr: the iomapped memory address that is generated by ioremap() or ioremap_nocache()
* Write an u32 value to I/O device memory.
* SYNOPSIS:
* #define writel(val,addr)
/* _VMKLNX_CODECHECK_: writel */
#define writel(val,addr) __writel((val),(addr))
* writew - write an u16 value to I/O device memory
* @val: the u16 value to be written
* Write an u16 value to I/O device memory.
* #define writew(val,addr)
/* _VMKLNX_CODECHECK_: writew */
#define writew(val,addr) __writew((val),(addr))
* writeb - write an u8 value to I/O device memory
* @val: the u8 value to be written
* Write an u8 value to I/O device memory.
* #define writeb(val,addr)
/* _VMKLNX_CODECHECK_: writeb */
#define writeb(val,addr) __writeb((val),(addr))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define __raw_writeq writeq
* memcpy_fromio - copy from an IO device space to main memory space
* @from: the address for the IO Device in PCI space
* @to: the address to where the copy is to happen
* @len: the number of bytes to be copied
* Copy @len bytes from @from address of an IO device in the PCI space to
* @to address in main memory space
* None
/* _VMKLNX_CODECHECK_: memcpy_fromio */
static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
vmk_Memcpy(to, (void *)from, len);
* memcpy_toio - copy from main memory space to IO device space
* @to: the address for the IO Device in PCI space
* @from: the address from where the copy is to happen
* Copy @len bytes from @from address to @to address of a IO Device in the PCI
* space.
* RETURN VALUE
/* _VMKLNX_CODECHECK_: memcpy_toio */
static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
vmk_Memcpy((void *)to, from, len);
void __memcpy_fromio(void*,unsigned long,unsigned);
void __memcpy_toio(unsigned long,const void*,unsigned);
__memcpy_fromio(to,(unsigned long)from,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))
* Again, x86-64 does not require mem IO specific function.
#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
* check_signature - find BIOS signatures
* @io_addr: mmio address to check
* @signature: signature block
* @length: length of signature
* Perform a signature comparison with the mmio address io_addr. This
* address should have been obtained by ioremap.
* Returns 1 on a match.
static inline int check_signature(void __iomem *io_addr,
const unsigned char *signature, int length)
int retval = 0;
do {
if (readb(io_addr) != *signature)
goto out;
io_addr++;
signature++;
length--;
} while (length);
retval = 1;
out:
return retval;
/* Nothing to do */
#define dma_cache_inv(_start,_size) do { } while (0)
#define dma_cache_wback(_start,_size) do { } while (0)
#define dma_cache_wback_inv(_start,_size) do { } while (0)
#define flush_write_buffers()
extern int iommu_bio_merge;
#define BIO_VMERGE_BOUNDARY iommu_bio_merge
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
#define xlate_dev_mem_ptr(p) __va(p)
* Convert a virtual cached pointer to an uncached pointer
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */