glibc/sysdeps/unix/sysv/linux/alpha/ioperm.c
Ulrich Drepper a3e59be8d1 Update.
Mon Aug 12 03:31:58 1996  Ulrich Drepper  <drepper@cygnus.com>

	* nss/nsswitch.c (__nss_configure_lookup):  New function.
	Allows to specify services.
	* nss/XXX-lookup.h: Rename database variable and make global.
	* nss/databases.def: New file.  Real names of all databases.

	* nss/nss.h: New file.  Contains declaration useful for users
	and service developers.
	* nss/nsswitch.h: Move some declarations to nss/nss.h.
	* nss.h: New file.  Wrapper around nss/nss.h.

	* nss/Makefile (headers): Add nss.h.
	(distributes): Add databases.h.

Sun Aug 11 16:19:42 1996  Ulrich Drepper  <drepper@cygnus.com>

	Help the poor people with fast machines by making sure only
	one `ar' commands works on the library.
	* autolock.sh: New file.  Written by Tom Tromey.
	* Makerules (do-ar): Call autolock.sh shell script instead of
	directly using `ar'.
	* config.make.in: Make configuration variable AUTOLOCK which
	gets initialized by configure.
	* configure.in: Define variable AUTOLOCK to point to autolock.sh
	script and mark it to substitute.

	* string/Makefile: Add -fno-builtin for tst-strlen.c, too.

	* elf/dl-lookup.c (_dl_lookup_symbol): Allow self-referencing.
	Patch by David Mosberger-Tang.

Sun Aug 11 01:12:38 1996  Richard Henderson  <rth@tamu.edu>

	* sysdeps/alpha/dl-machine.h (elf_alpha_fix_plt): Optimize LD_BIND_NOW
	startup by moving Icache flush from here ...
	(ELF_MACHINE_RUNTIME_TRAMPOLINE): ... to here.
	(ELF_MACHINE_USER_ADDRESS_MASK): Delete; it is unused.

	* sysdeps/alpha/divrem.h: Update comment to reflect the actual
	calling conventions.  The code is already correct.

Sun Aug 11 01:06:42 1996  Richard Henderson  <rth@tamu.edu>

	* string/Makefile: Compile tester with -fno-builtin as we want to
	test our implementations, not gcc's.
1996-08-12 01:42:37 +00:00

525 lines
12 KiB
C

/* Copyright (C) 1992, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Mosberger.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* I/O access is restricted to ISA port space (ports 0..65535).
Modern devices hopefully are sane enough not to put any performance
critical registers in i/o space.
On the first call to ioperm() or _sethae(), the entire (E)ISA port
space is mapped into the virtual address space at address io.base.
mprotect() calls are then used to enable/disable access to ports. Per
page, there are PAGE_SIZE>>IO_SHIFT I/O ports (e.g., 256 ports on a
Low Cost Alpha based system using 8KB pages).
Keep in mind that this code should be able to run in a 32bit address
space. It is therefore unreasonable to expect mmap'ing the entire
sparse address space would work (e.g., the Low Cost Alpha chip has an
I/O address space that's 512MB large!). */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <asm/page.h>
#include <asm/system.h>
#define PATH_ALPHA_SYSTYPE "/etc/alpha_systype"
#define PATH_CPUINFO "/proc/cpuinfo"
#define MAX_PORT 0x10000
#define vuip volatile unsigned int *
#define JENSEN_IO_BASE (0xfffffc0300000000UL)
#define JENSEN_MEM (0xfffffc0200000000UL) /* sparse!! */
/*
* With respect to the I/O architecture, APECS and LCA are identical,
* so the following defines apply to LCA as well.
*/
#define APECS_IO_BASE (0xfffffc01c0000000UL)
#define APECS_SPARSE_MEM (0xfffffc0200000000UL)
#define APECS_DENSE_MEM (0xfffffc0300000000UL)
#define CIA_IO_BASE (0xfffffc8580000000UL)
#define CIA_SPARSE_MEM (0xfffffc8000000000UL)
#define CIA_DENSE_MEM (0xfffffc8600000000UL)
enum {
IOSYS_JENSEN = 0, IOSYS_APECS = 1, IOSYS_CIA = 2
} iosys_t;
struct ioswtch {
void (*sethae)(unsigned long addr);
void (*outb)(unsigned char b, unsigned long port);
void (*outw)(unsigned short b, unsigned long port);
void (*outl)(unsigned int b, unsigned long port);
unsigned int (*inb)(unsigned long port);
unsigned int (*inw)(unsigned long port);
unsigned int (*inl)(unsigned long port);
};
static struct platform {
const char *name;
int io_sys;
unsigned long bus_memory_base;
unsigned long sparse_bus_memory_base;
} platform[] = {
{"Alcor", IOSYS_CIA, CIA_DENSE_MEM, CIA_SPARSE_MEM},
{"Avanti", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"Cabriolet", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"EB164", IOSYS_CIA, CIA_DENSE_MEM, CIA_SPARSE_MEM},
{"EB64+", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"EB66", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"EB66P", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"Jensen", IOSYS_JENSEN, JENSEN_MEM, JENSEN_MEM},
{"Mikasa", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"Mustang", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
{"Noname", IOSYS_APECS, APECS_DENSE_MEM, APECS_SPARSE_MEM},
};
static struct {
struct hae {
unsigned long cache;
unsigned long * reg;
} hae;
unsigned long base;
struct ioswtch * swp;
int sys;
} io;
static unsigned long bus_memory_base = -1;
static unsigned long sparse_bus_memory_base = -1;
extern void __sethae (unsigned long); /* we can't use asm/io.h */
static inline unsigned long
port_to_cpu_addr (unsigned long port, int iosys, int size)
{
if (iosys == IOSYS_JENSEN)
return (port << 7) + ((size - 1) << 5) + io.base;
else
return (port << 5) + ((size - 1) << 3) + io.base;
}
static inline void
inline_sethae (unsigned long addr, int iosys)
{
if (iosys == IOSYS_JENSEN)
{
/* hae on the Jensen is bits 31:25 shifted right */
addr >>= 25;
if (addr != io.hae.cache)
{
__sethae (addr);
io.hae.cache = addr;
}
}
else
{
unsigned long msb;
/* no need to set hae if msb is 0: */
msb = addr & 0xf8000000;
if (msb && msb != io.hae.cache)
{
__sethae (msb);
io.hae.cache = msb;
}
}
}
static inline void
inline_outb (unsigned char b, unsigned long port, int iosys)
{
unsigned int w;
unsigned long addr = port_to_cpu_addr (port, iosys, 1);
inline_sethae (0, iosys);
asm ("insbl %2,%1,%0" : "r=" (w) : "ri" (port & 0x3), "r" (b));
*(vuip)addr = w;
mb ();
}
static inline void
inline_outw (unsigned short b, unsigned long port, int iosys)
{
unsigned int w;
unsigned long addr = port_to_cpu_addr (port, iosys, 2);
inline_sethae (0, iosys);
asm ("inswl %2,%1,%0" : "r=" (w) : "ri" (port & 0x3), "r" (b));
*(vuip)addr = w;
mb ();
}
static inline void
inline_outl (unsigned int b, unsigned long port, int iosys)
{
unsigned long addr = port_to_cpu_addr (port, iosys, 4);
if (port >= MAX_PORT)
return;
inline_sethae (0, iosys);
*(vuip)addr = b;
mb ();
}
static inline unsigned int
inline_inb (unsigned long port, int iosys)
{
unsigned long result, addr = port_to_cpu_addr (port, iosys, 1);
inline_sethae (0, iosys);
result = *(vuip) addr;
result >>= (port & 3) * 8;
return 0xffUL & result;
}
static inline unsigned int
inline_inw (unsigned long port, int iosys)
{
unsigned long result, addr = port_to_cpu_addr (port, iosys, 2);
inline_sethae (0, iosys);
result = *(vuip) addr;
result >>= (port & 3) * 8;
return 0xffffUL & result;
}
static inline unsigned int
inline_inl (unsigned long port, int iosys)
{
unsigned long addr = port_to_cpu_addr (port, iosys, 4);
inline_sethae (0, iosys);
return *(vuip) addr;
}
#define DCL_SETHAE(name, iosys) \
static void \
name##_sethae (unsigned long addr) \
{ \
inline_sethae (addr, IOSYS_##iosys); \
}
#define DCL_OUT(name, func, type, iosys) \
static void \
name##_##func (unsigned type b, unsigned long addr) \
{ \
inline_##func (b, addr, IOSYS_##iosys); \
}
#define DCL_IN(name, func, iosys) \
static unsigned int \
name##_##func (unsigned long addr) \
{ \
return inline_##func (addr, IOSYS_##iosys); \
}
DCL_SETHAE(jensen, JENSEN)
DCL_OUT(jensen, outb, char, JENSEN)
DCL_OUT(jensen, outw, short, JENSEN)
DCL_OUT(jensen, outl, int, JENSEN)
DCL_IN(jensen, inb, JENSEN)
DCL_IN(jensen, inw, JENSEN)
DCL_IN(jensen, inl, JENSEN)
/* The APECS functions are also used for CIA since they are
identical. */
DCL_SETHAE(apecs, APECS)
DCL_OUT(apecs, outb, char, APECS)
DCL_OUT(apecs, outw, short, APECS)
DCL_OUT(apecs, outl, int, APECS)
DCL_IN(apecs, inb, APECS)
DCL_IN(apecs, inw, APECS)
DCL_IN(apecs, inl, APECS)
struct ioswtch ioswtch[] = {
{
jensen_sethae,
jensen_outb, jensen_outw, jensen_outl,
jensen_inb, jensen_inw, jensen_inl
},
{
apecs_sethae,
apecs_outb, apecs_outw, apecs_outl,
apecs_inb, apecs_inw, apecs_inl
}
};
/*
* Initialize I/O system. To determine what I/O system we're dealing
* with, we first try to read the value of symlink PATH_ALPHA_SYSTYPE,
* if that fails, we lookup the "system type" field in /proc/cpuinfo.
* If that fails as well, we give up.
*/
static int
init_iosys (void)
{
char systype[256];
int i, n;
n = readlink(PATH_ALPHA_SYSTYPE, systype, sizeof(systype) - 1);
if (n > 0)
{
systype[n] = '\0';
}
else
{
FILE * fp;
fp = fopen (PATH_CPUINFO, "r");
if (!fp)
return -1;
while ((n = fscanf (fp, "system type : %256[^\n]\n", systype))
!= EOF)
{
if (n == 1)
break;
else
fgets (systype, 256, fp);
}
fclose(fp);
if (n == EOF)
{
/* this can happen if the format of /proc/cpuinfo changes... */
fprintf(stderr,
"ioperm.init_iosys(): Unable to determine system type.\n"
"\t(May need " PATH_ALPHA_SYSTYPE " symlink?)\n");
errno = ENODEV;
return -1;
}
}
/* translate systype name into i/o system: */
for (i = 0; i < sizeof (platform) / sizeof (platform[0]); ++i)
{
if (strcmp (platform[i].name, systype) == 0)
{
bus_memory_base = platform[i].bus_memory_base;
sparse_bus_memory_base = platform[i].sparse_bus_memory_base;
io.sys = platform[i].io_sys;
if (io.sys == IOSYS_JENSEN)
io.swp = &ioswtch[0];
else
io.swp = &ioswtch[1];
return 0;
}
}
/* systype is not a know platform name... */
errno = EINVAL;
return -1;
}
int
_ioperm (unsigned long from, unsigned long num, int turn_on)
{
unsigned long addr, len;
int prot;
if (!io.swp && init_iosys () < 0)
return -1;
/* this test isn't as silly as it may look like; consider overflows! */
if (from >= MAX_PORT || from + num > MAX_PORT)
{
errno = EINVAL;
return -1;
}
if (turn_on)
{
if (!io.base)
{
unsigned long base;
int fd;
io.hae.reg = 0; /* not used in user-level */
io.hae.cache = 0;
__sethae (io.hae.cache); /* synchronize with hw */
fd = open ("/dev/mem", O_RDWR);
if (fd < 0)
return fd;
switch (io.sys)
{
case IOSYS_JENSEN: base = JENSEN_IO_BASE; break;
case IOSYS_APECS: base = APECS_IO_BASE; break;
case IOSYS_CIA: base = CIA_IO_BASE; break;
default:
errno = ENODEV;
return -1;
}
addr = port_to_cpu_addr (from, io.sys, 1);
addr &= PAGE_MASK;
len = port_to_cpu_addr (MAX_PORT, io.sys, 1) - addr;
io.base =
(unsigned long) __mmap (0, len, PROT_NONE, MAP_SHARED, fd, base);
close (fd);
if ((long) io.base == -1)
return -1;
}
prot = PROT_READ | PROT_WRITE;
}
else
{
if (!io.base)
return 0; /* never was turned on... */
/* turnoff access to relevant pages: */
prot = PROT_NONE;
}
addr = port_to_cpu_addr (from, io.sys, 1);
addr &= PAGE_MASK;
len = port_to_cpu_addr (from + num, io.sys, 1) - addr;
return mprotect ((void *) addr, len, prot);
}
int
_iopl (unsigned int level)
{
if (level > 3)
{
errno = EINVAL;
return -1;
}
if (level)
{
return _ioperm (0, MAX_PORT, 1);
}
return 0;
}
void
_sethae (unsigned long addr)
{
if (!io.swp && init_iosys () < 0)
return;
io.swp->sethae (addr);
}
void
_outb (unsigned char b, unsigned long port)
{
if (port >= MAX_PORT)
return;
io.swp->outb (b, port);
}
void
_outw (unsigned short b, unsigned long port)
{
if (port >= MAX_PORT)
return;
io.swp->outw (b, port);
}
void
_outl (unsigned int b, unsigned long port)
{
if (port >= MAX_PORT)
return;
io.swp->outl (b, port);
}
unsigned int
_inb (unsigned long port)
{
return io.swp->inb (port);
}
unsigned int
_inw (unsigned long port)
{
return io.swp->inw (port);
}
unsigned int
_inl (unsigned long port)
{
return io.swp->inl (port);
}
unsigned long
_bus_base(void)
{
if (!io.swp && init_iosys () < 0)
return -1;
return bus_memory_base;
}
unsigned long
_bus_base_sparse(void)
{
if (!io.swp && init_iosys () < 0)
return -1;
return sparse_bus_memory_base;
}
weak_alias (_sethae, sethae);
weak_alias (_ioperm, ioperm);
weak_alias (_iopl, iopl);
weak_alias (_inb, inb);
weak_alias (_inw, inw);
weak_alias (_inl, inl);
weak_alias (_outb, outb);
weak_alias (_outw, outw);
weak_alias (_outl, outl);
weak_alias (_bus_base, bus_base);
weak_alias (_bus_base_sparse, bus_base_sparse);