minix/kernel/system/do_devio.c
Ben Gras 6f77685609 Split of architecture-dependent and -independent functions for i386,
mainly in the kernel and headers. This split based on work by
Ingmar Alting <iaalting@cs.vu.nl> done for his Minix PowerPC architecture
port.

 . kernel does not program the interrupt controller directly, do any
   other architecture-dependent operations, or contain assembly any more,
   but uses architecture-dependent functions in arch/$(ARCH)/.
 . architecture-dependent constants and types defined in arch/$(ARCH)/include.
 . <ibm/portio.h> moved to <minix/portio.h>, as they have become, for now,
   architecture-independent functions.
 . int86, sdevio, readbios, and iopenable are now i386-specific kernel calls
   and live in arch/i386/do_* now.
 . i386 arch now supports even less 86 code; e.g. mpx86.s and klib86.s have
   gone, and 'machine.protected' is gone (and always taken to be 1 in i386).
   If 86 support is to return, it should be a new architecture.
 . prototypes for the architecture-dependent functions defined in
   kernel/arch/$(ARCH)/*.c but used in kernel/ are in kernel/proto.h
 . /etc/make.conf included in makefiles and shell scripts that need to
   know the building architecture; it defines ARCH=<arch>, currently only
   i386.
 . some basic per-architecture build support outside of the kernel (lib)
 . in clock.c, only dequeue a process if it was ready
 . fixes for new include files

files deleted:
 . mpx/klib.s - only for choosing between mpx/klib86 and -386
 . klib86.s - only for 86

i386-specific files files moved (or arch-dependent stuff moved) to arch/i386/:
 . mpx386.s (entry point)
 . klib386.s
 . sconst.h
 . exception.c
 . protect.c
 . protect.h
 . i8269.c
2006-12-22 15:22:27 +00:00

87 lines
2.4 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_DEVIO
*
* The parameters for this kernel call are:
* m2_i3: DIO_REQUEST (request input or output)
* m2_l1: DIO_PORT (port to read/ write)
* m2_l2: DIO_VALUE (value to write/ return value read)
*/
#include "../system.h"
#include <minix/devio.h>
#include <minix/endpoint.h>
#include <minix/portio.h>
#if USE_DEVIO
/*===========================================================================*
* do_devio *
*===========================================================================*/
PUBLIC int do_devio(m_ptr)
register message *m_ptr; /* pointer to request message */
{
struct proc *rp;
struct priv *privp;
port_t port;
struct io_range *iorp;
int i, size, nr_io_range;
int io_type, io_dir;
io_type = m_ptr->DIO_REQUEST & _DIO_TYPEMASK;
io_dir = m_ptr->DIO_REQUEST & _DIO_DIRMASK;
rp= proc_addr(who_p);
privp= priv(rp);
if (!privp)
{
kprintf("no priv structure!\n");
goto doit;
}
if (privp->s_flags & CHECK_IO_PORT)
{
switch (io_type)
{
case _DIO_BYTE: size= 1; break;
case _DIO_WORD: size= 2; break;
case _DIO_LONG: size= 4; break;
default: size= 4; break; /* Be conservative */
}
port= m_ptr->DIO_PORT;
nr_io_range= privp->s_nr_io_range;
for (i= 0, iorp= privp->s_io_tab; i<nr_io_range; i++, iorp++)
{
if (port >= iorp->ior_base && port+size-1 <= iorp->ior_limit)
break;
}
if (i >= nr_io_range)
{
kprintf(
"do_devio: I/O port check failed for proc %d, port 0x%x\n",
m_ptr->m_source, port);
return EPERM;
}
}
doit:
/* Process a single I/O request for byte, word, and long values. */
if (io_dir == _DIO_INPUT) {
switch (io_type) {
/* maybe "it" should not be called ports */
case _DIO_BYTE: m_ptr->DIO_VALUE = inb(m_ptr->DIO_PORT); break;
case _DIO_WORD: m_ptr->DIO_VALUE = inw(m_ptr->DIO_PORT); break;
case _DIO_LONG: m_ptr->DIO_VALUE = inl(m_ptr->DIO_PORT); break;
default: return(EINVAL);
}
} else {
switch (io_type) {
case _DIO_BYTE: outb(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
case _DIO_WORD: outw(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
case _DIO_LONG: outl(m_ptr->DIO_PORT, m_ptr->DIO_VALUE); break;
default: return(EINVAL);
}
}
return(OK);
}
#endif /* USE_DEVIO */