--- /dev/null
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Phil Blundell, based on the Alpha version 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* I/O port access on the ARM is something of a fiction. What we do is to
+ map an appropriate area of /dev/mem into user space so that a program
+ can blast away at the hardware in such a way as to generate I/O cycles
+ on the bus. To insulate user code from dependencies on particular
+ hardware we don't allow calls to inb() and friends to be inlined, but
+ force them to come through code in here every time. Performance-critical
+ registers tend to be memory mapped these days so this should be no big
+ problem. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+
+#include <asm/page.h>
+
+#define PATH_ARM_SYSTYPE "/etc/arm_systype"
+#define PATH_CPUINFO "/proc/cpuinfo"
+
+#define MAX_PORT 0x10000
+
+static struct {
+ unsigned long int base;
+ unsigned long int io_base;
+ unsigned int shift;
+ unsigned int initdone; /* since all the above could be 0 */
+} io;
+
+#define IO_BASE_FOOTBRIDGE 0x7c000000
+#define IO_SHIFT_FOOTBRIDGE 0
+
+static struct platform {
+ const char *name;
+ unsigned long int io_base;
+ unsigned int shift;
+} platform[] = {
+ /* All currently supported platforms are in fact the same. :-) */
+ {"Chalice-CATS", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
+ {"DEC-EBSA285", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
+ {"Corel-NetWinder", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
+};
+
+#define IO_ADDR(port) (io.base + ((port) << io.shift))
+
+/*
+ * Initialize I/O system. To determine what I/O system we're dealing
+ * with, we first try to read the value of symlink PATH_ARM_SYSTYPE,
+ * if that fails, we lookup the "system type" field in /proc/cpuinfo.
+ * If that fails as well, we give up. Other possible options might be
+ * to look at the ELF auxiliary vector or to add a special system call
+ * but there is probably no point.
+ *
+ * If the value received from PATH_ARM_SYSTYPE begins with a number,
+ * assume this is a previously unsupported system and the values encode,
+ * in order, "<io_base>,<port_shift>".
+ */
+
+static int
+init_iosys (void)
+{
+ char systype[256];
+ int i, n;
+
+ n = readlink (PATH_ARM_SYSTYPE, systype, sizeof (systype) - 1);
+ if (n > 0)
+ {
+ systype[n] = '\0';
+ if (isdigit (systype[0]))
+ {
+ if (sscanf (systype, "%li,%i", &io.io_base, &io.shift) == 2)
+ {
+ io.initdone = 1;
+ return 0;
+ }
+ /* else we're likely going to fail with the system match below */
+ }
+ }
+ else
+ {
+ FILE * fp;
+
+ fp = fopen (PATH_CPUINFO, "r");
+ if (!fp)
+ return -1;
+ while ((n = fscanf (fp, "Hardware\t: %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: Unable to determine system type.\n"
+ "\t(May need " PATH_ARM_SYSTYPE " symlink?)\n");
+ __set_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)
+ {
+ io.shift = platform[i].shift;
+ io.io_base = platform[i].io_base;
+ io.initdone = 1;
+ return 0;
+ }
+ }
+
+ /* systype is not a known platform name... */
+ __set_errno (EINVAL);
+ return -1;
+}
+
+int
+_ioperm (unsigned long int from, unsigned long int num, int turn_on)
+{
+ unsigned long int addr, len;
+ int prot;
+
+ if (!io.initdone && 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)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ if (turn_on)
+ {
+ if (! io.base)
+ {
+ int fd;
+
+ fd = open ("/dev/mem", O_RDWR);
+ if (fd < 0)
+ return -1;
+
+ io.base =
+ (unsigned long int) __mmap (0, MAX_PORT << io.shift, PROT_NONE,
+ MAP_SHARED, fd, io.io_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 = (io.base + (from << io.shift)) & PAGE_MASK;
+ len = num << io.shift;
+ return mprotect ((void *) addr, len, prot);
+}
+
+
+int
+_iopl (unsigned int level)
+{
+ if (level > 3)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+ if (level)
+ {
+ return _ioperm (0, MAX_PORT, 1);
+ }
+ return 0;
+}
+
+
+void
+_outb (unsigned char b, unsigned long int port)
+{
+ if (port >= MAX_PORT)
+ return;
+
+ *((volatile unsigned char *)(IO_ADDR (port))) = b;
+}
+
+
+void
+_outw (unsigned short b, unsigned long int port)
+{
+ if (port >= MAX_PORT)
+ return;
+
+ *((volatile unsigned short *)(IO_ADDR (port))) = b;
+}
+
+
+void
+_outl (unsigned int b, unsigned long int port)
+{
+ if (port >= MAX_PORT)
+ return;
+
+ *((volatile unsigned long *)(IO_ADDR (port))) = b;
+}
+
+
+unsigned int
+_inb (unsigned long int port)
+{
+ return *((volatile unsigned char *)(IO_ADDR (port)));
+}
+
+
+unsigned int
+_inw (unsigned long int port)
+{
+ return *((volatile unsigned short *)(IO_ADDR (port)));
+}
+
+
+unsigned int
+_inl (unsigned long int port)
+{
+ return *((volatile unsigned long *)(IO_ADDR (port)));
+}
+
+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);
--- /dev/null
+/* Copyright (C) 1996, 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _SYS_IO_H
+
+#define _SYS_IO_H 1
+#include <features.h>
+
+__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. */
+extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
+ int __turn_on));
+
+/* Set the I/O privilege level to LEVEL. If LEVEL is nonzero,
+ permission to access any I/O port is granted. This call requires
+ root privileges. */
+extern int iopl __P ((int __level));
+
+/* The functions that actually perform reads and writes. */
+extern unsigned char inb (unsigned long port);
+extern unsigned short inw (unsigned long port);
+extern unsigned long inl (unsigned long port);
+
+extern void outb (unsigned char value, unsigned long port);
+extern void outw (unsigned short value, unsigned long port);
+extern void outl (unsigned long value, unsigned long port);
+
+__END_DECLS
+
+#endif /* _SYS_IO_H */
s_setuid setuid setuid 1 __syscall_setuid
syscall - syscall 5 syscall
vm86 - vm86 1 __vm86 vm86
-
-# System calls with wrappers.
-rt_sigaction - rt_sigaction 4 __syscall_rt_sigaction
-rt_sigpending - rt_sigpending 2 __syscall_rt_sigpending
-rt_sigprocmask - rt_sigprocmask 4 __syscall_rt_sigprocmask
-rt_sigqueueinfo - rt_sigqueueinfo 3 __syscall_rt_sigqueueinfo
-rt_sigsuspend - rt_sigsuspend 2 __syscall_rt_sigsuspend
-rt_sigtimedwait - rt_sigtimedwait 4 __syscall_rt_sigtimedwait
-s_getcwd getcwd getcwd 2 __syscall_getcwd
-s_getdents getdents getdents 3 __syscall_getdents
-s_getpriority getpriority getpriority 2 __syscall_getpriority
-s_getresgid getresgid getresgid 3 __syscall_getresgid
-s_getresuid getresuid getresuid 3 __syscall_getresuid
-s_poll poll poll 3 __syscall_poll
-s_pread64 pread64 pread 5 __syscall_pread
-s_ptrace ptrace ptrace 4 __syscall_ptrace
-s_pwrite64 pwrite64 pwrite 5 __syscall_pwrite
-s_reboot reboot reboot 3 __syscall_reboot
-s_sigaction sigaction sigaction 3 __syscall_sigaction
-s_sigpending sigpending sigpending 1 __syscall_sigpending
-s_sigprocmask sigprocmask sigprocmask 3 __syscall_sigprocmask
-s_sigsuspend sigsuspend sigsuspend 3 __syscall_sigsuspend
-s_sysctl sysctl _sysctl 1 __syscall__sysctl
-s_ustat ustat ustat 2 __syscall_ustat
-sys_fstat fxstat fstat 2 __syscall_fstat
-sys_lstat lxstat lstat 2 __syscall_lstat
-sys_mknod xmknod mknod 3 __syscall_mknod
-sys_readv readv readv 3 __syscall_readv
-sys_stat xstat stat 2 __syscall_stat
-sys_writev writev writev 3 __syscall_writev
#define UNDOARGS_4 /* nothing */
#define UNDOARGS_5 ldr r4, [sp];
+#else /* not __ASSEMBLER__ */
+
+/* Define a macro which expands into the inline wrapper code for a system
+ call. */
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...) \
+ ({ unsigned int _sys_result; \
+ { \
+ register int _a1 asm ("a1"); \
+ LOAD_ARGS_##nr (args) \
+ asm volatile ("swi %1" \
+ : "=r" (_a1) \
+ : "i" (SYS_ify(name)) ASM_ARGS_##nr \
+ : "a1"); \
+ _sys_result = _a1; \
+ } \
+ if (_sys_result >= (unsigned int) -4095) \
+ { \
+ __set_errno (-_sys_result); \
+ _sys_result = (unsigned int) -1; \
+ } \
+ (int) _sys_result; })
+
+#define LOAD_ARGS_0()
+#define ASM_ARGS_0
+#define LOAD_ARGS_1(a1) \
+ _a1 = (int) (a1); \
+ LOAD_ARGS_0 ()
+#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
+#define LOAD_ARGS_2(a1, a2) \
+ register int _a2 asm ("a2") = (int) (a2); \
+ LOAD_ARGS_1 (a1)
+#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
+#define LOAD_ARGS_3(a1, a2, a3) \
+ register int _a3 asm ("a3") = (int) (a3); \
+ LOAD_ARGS_2 (a1, a2)
+#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
+#define LOAD_ARGS_4(a1, a2, a3, a4) \
+ register int _a4 asm ("a4") = (int) (a4); \
+ LOAD_ARGS_3 (a1, a2, a3)
+#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
+ register int _v1 asm ("v1") = (int) (a5); \
+ LOAD_ARGS_4 (a1, a2, a3, a4)
+#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
+
#endif /* __ASSEMBLER__ */
#endif /* linux/arm/sysdep.h */
git://sourceware.org / glibc.git / commitdiff