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Software of the Month Club 2000 October
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Software of the Month - Ultimate Collection Shareware 277.iso
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WINLINUX
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DATA1.CAB
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programs_-_include
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ASM-ALPH.{_4
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IO.H
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C/C++ Source or Header
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1999-09-17
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10KB
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362 lines
#ifndef __ALPHA_IO_H
#define __ALPHA_IO_H
#include <linux/config.h>
#include <asm/system.h>
/* We don't use IO slowdowns on the Alpha, but.. */
#define __SLOW_DOWN_IO do { } while (0)
#define SLOW_DOWN_IO do { } while (0)
/*
* Virtual -> physical identity mapping starts at this offset
*/
#ifdef USE_48_BIT_KSEG
#define IDENT_ADDR 0xffff800000000000
#else
#define IDENT_ADDR 0xfffffc0000000000
#endif
#ifdef __KERNEL__
#include <asm/machvec.h>
/*
* We try to avoid hae updates (thus the cache), but when we
* do need to update the hae, we need to do it atomically, so
* that any interrupts wouldn't get confused with the hae
* register not being up-to-date with respect to the hardware
* value.
*/
static inline void __set_hae(unsigned long new_hae)
{
unsigned long ipl = swpipl(7);
alpha_mv.hae_cache = new_hae;
*alpha_mv.hae_register = new_hae;
mb();
/* Re-read to make sure it was written. */
new_hae = *alpha_mv.hae_register;
setipl(ipl);
}
static inline void set_hae(unsigned long new_hae)
{
if (new_hae != alpha_mv.hae_cache)
__set_hae(new_hae);
}
/*
* Change virtual addresses to physical addresses and vv.
*/
static inline unsigned long virt_to_phys(volatile void * address)
{
/* Conditionalize this on the CPU? This here is 40 bits,
whereas EV4 only supports 34. But KSEG is farther out
so it shouldn't _really_ matter. */
return 0xffffffffffUL & (unsigned long) address;
}
static inline void * phys_to_virt(unsigned long address)
{
return (void *) (address + IDENT_ADDR);
}
#else /* !__KERNEL__ */
/*
* Define actual functions in private name-space so it's easier to
* accommodate things like XFree or svgalib that like to define their
* own versions of inb etc.
*/
extern void __sethae (unsigned long addr); /* syscall */
extern void _sethae (unsigned long addr); /* cached version */
#endif /* !__KERNEL__ */
/*
* There are different chipsets to interface the Alpha CPUs to the world.
*/
#ifdef __KERNEL__
#ifdef CONFIG_ALPHA_GENERIC
/* In a generic kernel, we always go through the machine vector. */
# define virt_to_bus(a) alpha_mv.mv_virt_to_bus(a)
# define bus_to_virt(a) alpha_mv.mv_bus_to_virt(a)
# define __inb alpha_mv.mv_inb
# define __inw alpha_mv.mv_inw
# define __inl alpha_mv.mv_inl
# define __outb alpha_mv.mv_outb
# define __outw alpha_mv.mv_outw
# define __outl alpha_mv.mv_outl
# define __readb(a) alpha_mv.mv_readb((unsigned long)(a))
# define __readw(a) alpha_mv.mv_readw((unsigned long)(a))
# define __readl(a) alpha_mv.mv_readl((unsigned long)(a))
# define __readq(a) alpha_mv.mv_readq((unsigned long)(a))
# define __writeb(v,a) alpha_mv.mv_writeb((v),(unsigned long)(a))
# define __writew(v,a) alpha_mv.mv_writew((v),(unsigned long)(a))
# define __writel(v,a) alpha_mv.mv_writel((v),(unsigned long)(a))
# define __writeq(v,a) alpha_mv.mv_writeq((v),(unsigned long)(a))
# define inb __inb
# define inw __inw
# define inl __inl
# define outb __outb
# define outw __outw
# define outl __outl
# define readb __readb
# define readw __readw
# define readl __readl
# define readq __readq
# define writeb __writeb
# define writew __writew
# define writel __writel
# define writeq __writeq
# define dense_mem(a) alpha_mv.mv_dense_mem(a)
#else
/* Control how and what gets defined within the core logic headers. */
#define __WANT_IO_DEF
#if defined(CONFIG_ALPHA_APECS)
# include <asm/core_apecs.h>
#elif defined(CONFIG_ALPHA_CIA)
# include <asm/core_cia.h>
#elif defined(CONFIG_ALPHA_LCA)
# include <asm/core_lca.h>
#elif defined(CONFIG_ALPHA_MCPCIA)
# include <asm/core_mcpcia.h>
#elif defined(CONFIG_ALPHA_PYXIS)
# include <asm/core_pyxis.h>
#elif defined(CONFIG_ALPHA_T2)
# include <asm/core_t2.h>
#elif defined(CONFIG_ALPHA_TSUNAMI)
# include <asm/core_tsunami.h>
#elif defined(CONFIG_ALPHA_JENSEN)
# include <asm/jensen.h>
#elif defined(CONFIG_ALPHA_RX164)
# include <asm/core_polaris.h>
#else
#error "What system is this?"
#endif
#undef __WANT_IO_DEF
#endif /* GENERIC */
#endif /* __KERNEL__ */
/*
* The convention used for inb/outb etc. is that names starting with
* two underscores are the inline versions, names starting with a
* single underscore are proper functions, and names starting with a
* letter are macros that map in some way to inline or proper function
* versions. Not all that pretty, but before you change it, be sure
* to convince yourself that it won't break anything (in particular
* module support).
*/
extern unsigned int _inb (unsigned long port);
extern unsigned int _inw (unsigned long port);
extern unsigned int _inl (unsigned long port);
extern void _outb (unsigned char b,unsigned long port);
extern void _outw (unsigned short w,unsigned long port);
extern void _outl (unsigned int l,unsigned long port);
extern unsigned long _readb(unsigned long addr);
extern unsigned long _readw(unsigned long addr);
extern unsigned long _readl(unsigned long addr);
extern unsigned long _readq(unsigned long addr);
extern void _writeb(unsigned char b, unsigned long addr);
extern void _writew(unsigned short b, unsigned long addr);
extern void _writel(unsigned int b, unsigned long addr);
extern void _writeq(unsigned long b, unsigned long addr);
#ifdef __KERNEL__
/*
* The platform header files may define some of these macros to use
* the inlined versions where appropriate. These macros may also be
* redefined by userlevel programs.
*/
#ifndef inb
# define inb(p) _inb((p))
#endif
#ifndef inw
# define inw(p) _inw((p))
#endif
#ifndef inl
# define inl(p) _inl((p))
#endif
#ifndef outb
# define outb(b,p) _outb((b),(p))
#endif
#ifndef outw
# define outw(w,p) _outw((w),(p))
#endif
#ifndef outl
# define outl(l,p) _outl((l),(p))
#endif
#ifndef inb_p
# define inb_p inb
#endif
#ifndef inw_p
# define inw_p inw
#endif
#ifndef inl_p
# define inl_p inl
#endif
#ifndef outb_p
# define outb_p outb
#endif
#ifndef outw_p
# define outw_p outw
#endif
#ifndef outl_p
# define outl_p outl
#endif
#else
/* Userspace declarations. */
extern unsigned int inb (unsigned long port);
extern unsigned int inw (unsigned long port);
extern unsigned int inl (unsigned long port);
extern void outb (unsigned char b,unsigned long port);
extern void outw (unsigned short w,unsigned long port);
extern void outl (unsigned int l,unsigned long port);
extern unsigned long readb(unsigned long addr);
extern unsigned long readw(unsigned long addr);
extern unsigned long readl(unsigned long addr);
extern void writeb(unsigned char b, unsigned long addr);
extern void writew(unsigned short b, unsigned long addr);
extern void writel(unsigned int b, unsigned long addr);
#endif /* __KERNEL__ */
#ifdef __KERNEL__
/*
* The "address" in IO memory space is not clearly either an integer or a
* pointer. We will accept both, thus the casts.
*
* On the alpha, we have the whole physical address space mapped at all
* times, so "ioremap()" and "iounmap()" do not need to do anything.
*/
static inline void * ioremap(unsigned long offset, unsigned long size)
{
return (void *) offset;
}
static inline void iounmap(void *addr)
{
}
#ifndef readb
# define readb(a) _readb((unsigned long)(a))
#endif
#ifndef readw
# define readw(a) _readw((unsigned long)(a))
#endif
#ifndef readl
# define readl(a) _readl((unsigned long)(a))
#endif
#ifndef readq
# define readq(a) _readq((unsigned long)(a))
#endif
#ifndef writeb
# define writeb(v,a) _writeb((v),(unsigned long)(a))
#endif
#ifndef writew
# define writew(v,a) _writew((v),(unsigned long)(a))
#endif
#ifndef writel
# define writel(v,a) _writel((v),(unsigned long)(a))
#endif
#ifndef writeq
# define writeq(v,a) _writeq((v),(unsigned long)(a))
#endif
/*
* String version of IO memory access ops:
*/
extern void _memcpy_fromio(void *, unsigned long, long);
extern void _memcpy_toio(unsigned long, const void *, long);
extern void _memset_c_io(unsigned long, unsigned long, long);
#define memcpy_fromio(to,from,len) \
_memcpy_fromio((to),(unsigned long)(from),(len))
#define memcpy_toio(to,from,len) \
_memcpy_toio((unsigned long)(to),(from),(len))
#define memset_io(addr,c,len) \
_memset_c_io((unsigned long)(addr),0x0101010101010101UL*(u8)(c),(len))
#define __HAVE_ARCH_MEMSETW_IO
#define memsetw_io(addr,c,len) \
_memset_c_io((unsigned long)(addr),0x0001000100010001UL*(u16)(c),(len))
/*
* String versions of in/out ops:
*/
extern void insb (unsigned long port, void *dst, unsigned long count);
extern void insw (unsigned long port, void *dst, unsigned long count);
extern void insl (unsigned long port, void *dst, unsigned long count);
extern void outsb (unsigned long port, const void *src, unsigned long count);
extern void outsw (unsigned long port, const void *src, unsigned long count);
extern void outsl (unsigned long port, const void *src, unsigned long count);
/*
* XXX - We don't have csum_partial_copy_fromio() yet, so we cheat here and
* just copy it. The net code will then do the checksum later. Presently
* only used by some shared memory 8390 Ethernet cards anyway.
*/
#define eth_io_copy_and_sum(skb,src,len,unused) \
memcpy_fromio((skb)->data,(src),(len))
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;
}
/*
* The Alpha Jensen hardware for some rather strange reason puts
* the RTC clock at 0x170 instead of 0x70. Probably due to some
* misguided idea about using 0x70 for NMI stuff.
*
* These defines will override the defaults when doing RTC queries
*/
#ifdef CONFIG_ALPHA_GENERIC
# define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
#else
# ifdef CONFIG_ALPHA_JENSEN
# define RTC_PORT(x) (0x170+(x))
# else
# define RTC_PORT(x) (0x70 + (x))
# endif
#endif
#define RTC_ALWAYS_BCD 0
#endif /* __KERNEL__ */
#endif /* __ALPHA_IO_H */