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File aarch64-io.h of Package linuxcnc

/* 
A largely dummy io.h to statisfy the requirements of Machinekit  
on aarch64
The functions still require a valid base address, which appears to be
#define PCI_IOBASE              ((void __iomem *)(MODULES_VADDR - SZ_2M))
MODULES_VADDR being the address at which insmod begins loading kernel modules
*/

#ifndef	_SYS_IO_H
#define	_SYS_IO_H

#include <features.h>

// as per arch/.../memory.txt
#define PCI_IOBASE   0xfee00000UL
// ((void __iomem *)(MODULES_VADDR - SZ_2M))
//((void __iomem *)PCI_IO_START)

__BEGIN_DECLS

/* If TURN_ON is TRUE, request for permission to do direct i/o on the
   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
   permission off for that range.  This call requires root privileges.

Portability note: not all Linux platforms support this call.  Most
   platforms based on the PC I/O architecture probably will, however.
   E.g., Linux/Alpha for Alpha PCs supports this.  */
//extern int ioperm (unsigned long int __from, unsigned long int __num,
//                   int __turn_on) __THROW;

/* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
   access any I/O port is granted.  This call requires root
   privileges. */

// Does not appear this call is supported
// dummy function to return 0 (success and keep pci_write happy

//int iopl(int __level) { return 0; }

#if defined __GNUC__ && __GNUC__ >= 2

// Does not appear this call is supported
// dummy function to return 0 (success and keep pci_write happy

static __inline int iopl(int __level) { return 0; }

static __inline unsigned char 
inb (unsigned short int __port)
{
    unsigned char val;
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
    
    asm volatile("ldrb %w0, [%1]" : "=r" (val) : "r" (addr));
    return val;
}

static __inline unsigned short int
inw (unsigned short int __port)
{
    unsigned short val;
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
  
    asm volatile("ldrh %w0, [%1]" : "=r" (val) : "r" (addr));
    return val;
}

static __inline unsigned int
inl (unsigned short int __port)
{
    unsigned int val;
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
  
    asm volatile("ldrh %w0, [%1]" : "=r" (val) : "r" (addr));
    
    return val;
}

///////////////////////////////////////////////////////////////////

static __inline void
outb (unsigned char __value, unsigned short int __port)
{
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
    asm volatile("strb %w0, [%1]" : : "r" (__value), "r" (addr));
}

static __inline void
outw (unsigned short int __value, unsigned short int __port)
{
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
    asm volatile("strh %w0, [%1]" : : "r" (__value), "r" (addr));
}

static __inline void
outl (unsigned int __value, unsigned short int __port)
{
    unsigned long addr = ((unsigned long) __port + PCI_IOBASE);
    asm volatile("strh %w0, [%1]" : : "r" (__value), "r" (addr));
}

#endif	/* GNU C */

__END_DECLS
#endif /* _SYS_IO_H */

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File aarch64-io.h of Package linuxcnc

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