Go to most recent revision |
Blame |
Compare with Previous |
Last modification |
View Log
| RSS feed
#ifndef _ASM_IO_H
#define _ASM_IO_H
#include <linux/config.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 IO_SPACE_LIMIT 0xffff
#define XQUAD_PORTIO_BASE 0xfe400000
#define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
#ifdef __KERNEL__
#include <linux/vmalloc.h>
/*
* Temporary debugging check to catch old code using
* unmapped ISA addresses. Will be removed in 2.4.
*/
#ifdef CONFIG_DEBUG_IOVIRT
extern void *__io_virt_debug(unsigned long x, const char *file, int line);
#define __io_virt(x) __io_virt_debug((unsigned long)(x), __FILE__, __LINE__)
#else
#define __io_virt(x) ((void *)(x))
#endif
/**
* virt_to_phys - map virtual addresses to physical
* @address: address to remap
*
* The returned physical address is the physical (CPU) mapping for
* the memory address given. It is only valid to use this function on
* addresses directly mapped or allocated via kmalloc.
*
* This function does not give bus mappings for DMA transfers. In
* almost all conceivable cases a device driver should not be using
* this function
*/
static inline unsigned long virt_to_phys(volatile void * address)
{
return __pa(address);
}
/**
* phys_to_virt - map physical address to virtual
* @address: address to remap
*
* The returned virtual address is a current CPU mapping for
* the memory address given. It is only valid to use this function on
* addresses that have a kernel mapping
*
* This function does not handle bus mappings for DMA transfers. In
* almost all conceivable cases a device driver should not be using
* this function
*/
static inline void * phys_to_virt(unsigned long address)
{
return __va(address);
}
/*
* Change "struct page" to physical address.
*/
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
/**
* ioremap - map bus memory into CPU space
* @offset: bus address of the memory
* @size: size of the resource to map
*
* ioremap performs a platform specific sequence of operations to
* make bus memory CPU accessible via the readb/readw/readl/writeb/
* writew/writel functions and the other mmio helpers. The returned
* address is not guaranteed to be usable directly as a virtual
* address.
*/
static inline void * ioremap (unsigned long offset, unsigned long size)
{
return __ioremap(offset, size, 0);
}
extern void * ioremap_nocache (unsigned long offset, unsigned long size);
extern void iounmap(void *addr);
/*
* bt_ioremap() and bt_iounmap() are for temporary early boot-time
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
*/
extern void *bt_ioremap(unsigned long offset, unsigned long size);
extern void bt_iounmap(void *addr, unsigned long size);
/*
* 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
/*
* 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.
*/
#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
#define memcpy_fromio(a,b,c) __memcpy((a),__io_virt(b),(c))
#define memcpy_toio(a,b,c) __memcpy(__io_virt(a),(b),(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 *)(PAGE_OFFSET))
#define isa_readb(a) readb(__ISA_IO_base + (a))
#define isa_readw(a) readw(__ISA_IO_base + (a))
#define isa_readl(a) readl(__ISA_IO_base + (a))
#define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))
#define isa_writew(w,a) writew(w,__ISA_IO_base + (a))
#define isa_writel(l,a) writel(l,__ISA_IO_base + (a))
#define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c))
#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
#define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c))
/*
* Again, i386 does not require mem IO specific function.
*/
#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(b),(c),(d))
#define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(__ISA_IO_base + (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(unsigned long 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;
}
/**
* isa_check_signature - find BIOS signatures
* @io_addr: mmio address to check
* @signature: signature block
* @length: length of signature
*
* Perform a signature comparison with the ISA mmio address io_addr.
* Returns 1 on a match.
*
* This function is deprecated. New drivers should use ioremap and
* check_signature.
*/
static inline int isa_check_signature(unsigned long io_addr,
const unsigned char *signature, int length)
{
int retval = 0;
do {
if (isa_readb(io_addr) != *signature)
goto out;
io_addr++;
signature++;
length--;
} while (length);
retval = 1;
out:
return retval;
}
/*
* Cache management
*
* This needed for two cases
* 1. Out of order aware processors
* 2. Accidentally out of order processors (PPro errata #51)
*/
#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
static inline void flush_write_buffers(void)
{
__asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
}
#define dma_cache_inv(_start,_size) flush_write_buffers()
#define dma_cache_wback(_start,_size) flush_write_buffers()
#define dma_cache_wback_inv(_start,_size) flush_write_buffers()
#else
/* 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()
#endif
#endif /* __KERNEL__ */
#ifdef SLOW_IO_BY_JUMPING
#define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:"
#else
#define __SLOW_DOWN_IO "outb %%al,$0x80;"
#endif
static inline void slow_down_io(void) {
__asm__ __volatile__(
__SLOW_DOWN_IO
#ifdef REALLY_SLOW_IO
__SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
#endif
: : );
}
#ifdef CONFIG_X86_NUMAQ
extern void *xquad_portio; /* Where the IO area was mapped */
#define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
#define __BUILDIO(bwl,bw,type) \
static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
if (xquad_portio) \
write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
else \
out##bwl##_local(value, port); \
} \
static inline void out##bwl(unsigned type value, int port) { \
out##bwl##_quad(value, port, 0); \
} \
static inline unsigned type in##bwl##_quad(int port, int quad) { \
if (xquad_portio) \
return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
else \
return in##bwl##_local(port); \
} \
static inline unsigned type in##bwl(int port) { \
return in##bwl##_quad(port, 0); \
}
#else
#define __BUILDIO(bwl,bw,type) \
static inline void out##bwl(unsigned type value, int port) { \
out##bwl##_local(value, port); \
} \
static inline unsigned type in##bwl(int port) { \
return in##bwl##_local(port); \
}
#endif
#define BUILDIO(bwl,bw,type) \
static inline void out##bwl##_local(unsigned type value, int port) { \
__asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
} \
static inline unsigned type in##bwl##_local(int port) { \
unsigned type value; \
__asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
return value; \
} \
static inline void out##bwl##_local_p(unsigned type value, int port) { \
out##bwl##_local(value, port); \
slow_down_io(); \
} \
static inline unsigned type in##bwl##_local_p(int port) { \
unsigned type value = in##bwl##_local(port); \
slow_down_io(); \
return value; \
} \
__BUILDIO(bwl,bw,type) \
static inline void out##bwl##_p(unsigned type value, int port) { \
out##bwl(value, port); \
slow_down_io(); \
} \
static inline unsigned type in##bwl##_p(int port) { \
unsigned type value = in##bwl(port); \
slow_down_io(); \
return value; \
} \
static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
__asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
} \
static inline void ins##bwl(int port, void *addr, unsigned long count) { \
__asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
}
BUILDIO(b,b,char)
BUILDIO(w,w,short)
BUILDIO(l,,int)
#endif