455 lines
11 KiB
C
455 lines
11 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
|
|
* Copyright (C) 1996 by Paul M. Antoine
|
|
* Copyright (C) 1999 Silicon Graphics
|
|
* Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 2000 MIPS Technologies, Inc.
|
|
*/
|
|
#ifndef _ASM_SYSTEM_H
|
|
#define _ASM_SYSTEM_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
#include <asm/cpu-features.h>
|
|
#include <asm/dsp.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/war.h>
|
|
#include <asm/interrupt.h>
|
|
|
|
/*
|
|
* read_barrier_depends - Flush all pending reads that subsequents reads
|
|
* depend on.
|
|
*
|
|
* No data-dependent reads from memory-like regions are ever reordered
|
|
* over this barrier. All reads preceding this primitive are guaranteed
|
|
* to access memory (but not necessarily other CPUs' caches) before any
|
|
* reads following this primitive that depend on the data return by
|
|
* any of the preceding reads. This primitive is much lighter weight than
|
|
* rmb() on most CPUs, and is never heavier weight than is
|
|
* rmb().
|
|
*
|
|
* These ordering constraints are respected by both the local CPU
|
|
* and the compiler.
|
|
*
|
|
* Ordering is not guaranteed by anything other than these primitives,
|
|
* not even by data dependencies. See the documentation for
|
|
* memory_barrier() for examples and URLs to more information.
|
|
*
|
|
* For example, the following code would force ordering (the initial
|
|
* value of "a" is zero, "b" is one, and "p" is "&a"):
|
|
*
|
|
* <programlisting>
|
|
* CPU 0 CPU 1
|
|
*
|
|
* b = 2;
|
|
* memory_barrier();
|
|
* p = &b; q = p;
|
|
* read_barrier_depends();
|
|
* d = *q;
|
|
* </programlisting>
|
|
*
|
|
* because the read of "*q" depends on the read of "p" and these
|
|
* two reads are separated by a read_barrier_depends(). However,
|
|
* the following code, with the same initial values for "a" and "b":
|
|
*
|
|
* <programlisting>
|
|
* CPU 0 CPU 1
|
|
*
|
|
* a = 2;
|
|
* memory_barrier();
|
|
* b = 3; y = b;
|
|
* read_barrier_depends();
|
|
* x = a;
|
|
* </programlisting>
|
|
*
|
|
* does not enforce ordering, since there is no data dependency between
|
|
* the read of "a" and the read of "b". Therefore, on some CPUs, such
|
|
* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
|
|
* in cases like this where there are no data dependencies.
|
|
*/
|
|
|
|
#define read_barrier_depends() do { } while(0)
|
|
|
|
#ifdef CONFIG_CPU_HAS_SYNC
|
|
#define __sync() \
|
|
__asm__ __volatile__( \
|
|
".set push\n\t" \
|
|
".set noreorder\n\t" \
|
|
".set mips2\n\t" \
|
|
"sync\n\t" \
|
|
".set pop" \
|
|
: /* no output */ \
|
|
: /* no input */ \
|
|
: "memory")
|
|
#else
|
|
#define __sync() do { } while(0)
|
|
#endif
|
|
|
|
#define __fast_iob() \
|
|
__asm__ __volatile__( \
|
|
".set push\n\t" \
|
|
".set noreorder\n\t" \
|
|
"lw $0,%0\n\t" \
|
|
"nop\n\t" \
|
|
".set pop" \
|
|
: /* no output */ \
|
|
: "m" (*(int *)CKSEG1) \
|
|
: "memory")
|
|
|
|
#define fast_wmb() __sync()
|
|
#define fast_rmb() __sync()
|
|
#define fast_mb() __sync()
|
|
#define fast_iob() \
|
|
do { \
|
|
__sync(); \
|
|
__fast_iob(); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_CPU_HAS_WB
|
|
|
|
#include <asm/wbflush.h>
|
|
|
|
#define wmb() fast_wmb()
|
|
#define rmb() fast_rmb()
|
|
#define mb() wbflush()
|
|
#define iob() wbflush()
|
|
|
|
#else /* !CONFIG_CPU_HAS_WB */
|
|
|
|
#define wmb() fast_wmb()
|
|
#define rmb() fast_rmb()
|
|
#define mb() fast_mb()
|
|
#define iob() fast_iob()
|
|
|
|
#endif /* !CONFIG_CPU_HAS_WB */
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define smp_mb() mb()
|
|
#define smp_rmb() rmb()
|
|
#define smp_wmb() wmb()
|
|
#define smp_read_barrier_depends() read_barrier_depends()
|
|
#else
|
|
#define smp_mb() barrier()
|
|
#define smp_rmb() barrier()
|
|
#define smp_wmb() barrier()
|
|
#define smp_read_barrier_depends() do { } while(0)
|
|
#endif
|
|
|
|
#define set_mb(var, value) \
|
|
do { var = value; mb(); } while (0)
|
|
|
|
#define set_wmb(var, value) \
|
|
do { var = value; wmb(); } while (0)
|
|
|
|
/*
|
|
* switch_to(n) should switch tasks to task nr n, first
|
|
* checking that n isn't the current task, in which case it does nothing.
|
|
*/
|
|
extern asmlinkage void *resume(void *last, void *next, void *next_ti);
|
|
|
|
struct task_struct;
|
|
|
|
#define switch_to(prev,next,last) \
|
|
do { \
|
|
if (cpu_has_dsp) \
|
|
__save_dsp(prev); \
|
|
(last) = resume(prev, next, next->thread_info); \
|
|
if (cpu_has_dsp) \
|
|
__restore_dsp(current); \
|
|
} while(0)
|
|
|
|
static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
|
|
{
|
|
__u32 retval;
|
|
|
|
if (cpu_has_llsc && R10000_LLSC_WAR) {
|
|
unsigned long dummy;
|
|
|
|
__asm__ __volatile__(
|
|
" .set mips3 \n"
|
|
"1: ll %0, %3 # xchg_u32 \n"
|
|
" .set mips0 \n"
|
|
" move %2, %z4 \n"
|
|
" .set mips3 \n"
|
|
" sc %2, %1 \n"
|
|
" beqzl %2, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
" .set mips0 \n"
|
|
: "=&r" (retval), "=m" (*m), "=&r" (dummy)
|
|
: "R" (*m), "Jr" (val)
|
|
: "memory");
|
|
} else if (cpu_has_llsc) {
|
|
unsigned long dummy;
|
|
|
|
__asm__ __volatile__(
|
|
" .set mips3 \n"
|
|
"1: ll %0, %3 # xchg_u32 \n"
|
|
" .set mips0 \n"
|
|
" move %2, %z4 \n"
|
|
" .set mips3 \n"
|
|
" sc %2, %1 \n"
|
|
" beqz %2, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
" .set mips0 \n"
|
|
: "=&r" (retval), "=m" (*m), "=&r" (dummy)
|
|
: "R" (*m), "Jr" (val)
|
|
: "memory");
|
|
} else {
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
retval = *m;
|
|
*m = val;
|
|
local_irq_restore(flags); /* implies memory barrier */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_64BIT
|
|
static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
|
|
{
|
|
__u64 retval;
|
|
|
|
if (cpu_has_llsc && R10000_LLSC_WAR) {
|
|
unsigned long dummy;
|
|
|
|
__asm__ __volatile__(
|
|
" .set mips3 \n"
|
|
"1: lld %0, %3 # xchg_u64 \n"
|
|
" move %2, %z4 \n"
|
|
" scd %2, %1 \n"
|
|
" beqzl %2, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
" .set mips0 \n"
|
|
: "=&r" (retval), "=m" (*m), "=&r" (dummy)
|
|
: "R" (*m), "Jr" (val)
|
|
: "memory");
|
|
} else if (cpu_has_llsc) {
|
|
unsigned long dummy;
|
|
|
|
__asm__ __volatile__(
|
|
" .set mips3 \n"
|
|
"1: lld %0, %3 # xchg_u64 \n"
|
|
" move %2, %z4 \n"
|
|
" scd %2, %1 \n"
|
|
" beqz %2, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
" .set mips0 \n"
|
|
: "=&r" (retval), "=m" (*m), "=&r" (dummy)
|
|
: "R" (*m), "Jr" (val)
|
|
: "memory");
|
|
} else {
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
retval = *m;
|
|
*m = val;
|
|
local_irq_restore(flags); /* implies memory barrier */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
#else
|
|
extern __u64 __xchg_u64_unsupported_on_32bit_kernels(volatile __u64 * m, __u64 val);
|
|
#define __xchg_u64 __xchg_u64_unsupported_on_32bit_kernels
|
|
#endif
|
|
|
|
/* This function doesn't exist, so you'll get a linker error
|
|
if something tries to do an invalid xchg(). */
|
|
extern void __xchg_called_with_bad_pointer(void);
|
|
|
|
static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
|
|
{
|
|
switch (size) {
|
|
case 4:
|
|
return __xchg_u32(ptr, x);
|
|
case 8:
|
|
return __xchg_u64(ptr, x);
|
|
}
|
|
__xchg_called_with_bad_pointer();
|
|
return x;
|
|
}
|
|
|
|
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
|
#define tas(ptr) (xchg((ptr),1))
|
|
|
|
#define __HAVE_ARCH_CMPXCHG 1
|
|
|
|
static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
|
|
unsigned long new)
|
|
{
|
|
__u32 retval;
|
|
|
|
if (cpu_has_llsc && R10000_LLSC_WAR) {
|
|
__asm__ __volatile__(
|
|
" .set push \n"
|
|
" .set noat \n"
|
|
" .set mips3 \n"
|
|
"1: ll %0, %2 # __cmpxchg_u32 \n"
|
|
" bne %0, %z3, 2f \n"
|
|
" .set mips0 \n"
|
|
" move $1, %z4 \n"
|
|
" .set mips3 \n"
|
|
" sc $1, %1 \n"
|
|
" beqzl $1, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
"2: \n"
|
|
" .set pop \n"
|
|
: "=&r" (retval), "=m" (*m)
|
|
: "R" (*m), "Jr" (old), "Jr" (new)
|
|
: "memory");
|
|
} else if (cpu_has_llsc) {
|
|
__asm__ __volatile__(
|
|
" .set push \n"
|
|
" .set noat \n"
|
|
" .set mips3 \n"
|
|
"1: ll %0, %2 # __cmpxchg_u32 \n"
|
|
" bne %0, %z3, 2f \n"
|
|
" .set mips0 \n"
|
|
" move $1, %z4 \n"
|
|
" .set mips3 \n"
|
|
" sc $1, %1 \n"
|
|
" beqz $1, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
"2: \n"
|
|
" .set pop \n"
|
|
: "=&r" (retval), "=m" (*m)
|
|
: "R" (*m), "Jr" (old), "Jr" (new)
|
|
: "memory");
|
|
} else {
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
retval = *m;
|
|
if (retval == old)
|
|
*m = new;
|
|
local_irq_restore(flags); /* implies memory barrier */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_64BIT
|
|
static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
|
|
unsigned long new)
|
|
{
|
|
__u64 retval;
|
|
|
|
if (cpu_has_llsc) {
|
|
__asm__ __volatile__(
|
|
" .set push \n"
|
|
" .set noat \n"
|
|
" .set mips3 \n"
|
|
"1: lld %0, %2 # __cmpxchg_u64 \n"
|
|
" bne %0, %z3, 2f \n"
|
|
" move $1, %z4 \n"
|
|
" scd $1, %1 \n"
|
|
" beqzl $1, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
"2: \n"
|
|
" .set pop \n"
|
|
: "=&r" (retval), "=m" (*m)
|
|
: "R" (*m), "Jr" (old), "Jr" (new)
|
|
: "memory");
|
|
} else if (cpu_has_llsc) {
|
|
__asm__ __volatile__(
|
|
" .set push \n"
|
|
" .set noat \n"
|
|
" .set mips3 \n"
|
|
"1: lld %0, %2 # __cmpxchg_u64 \n"
|
|
" bne %0, %z3, 2f \n"
|
|
" move $1, %z4 \n"
|
|
" scd $1, %1 \n"
|
|
" beqz $1, 1b \n"
|
|
#ifdef CONFIG_SMP
|
|
" sync \n"
|
|
#endif
|
|
"2: \n"
|
|
" .set pop \n"
|
|
: "=&r" (retval), "=m" (*m)
|
|
: "R" (*m), "Jr" (old), "Jr" (new)
|
|
: "memory");
|
|
} else {
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
retval = *m;
|
|
if (retval == old)
|
|
*m = new;
|
|
local_irq_restore(flags); /* implies memory barrier */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
#else
|
|
extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
|
|
volatile int * m, unsigned long old, unsigned long new);
|
|
#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
|
|
#endif
|
|
|
|
/* This function doesn't exist, so you'll get a linker error
|
|
if something tries to do an invalid cmpxchg(). */
|
|
extern void __cmpxchg_called_with_bad_pointer(void);
|
|
|
|
static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
|
|
unsigned long new, int size)
|
|
{
|
|
switch (size) {
|
|
case 4:
|
|
return __cmpxchg_u32(ptr, old, new);
|
|
case 8:
|
|
return __cmpxchg_u64(ptr, old, new);
|
|
}
|
|
__cmpxchg_called_with_bad_pointer();
|
|
return old;
|
|
}
|
|
|
|
#define cmpxchg(ptr,old,new) ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
|
|
|
|
extern void set_handler (unsigned long offset, void *addr, unsigned long len);
|
|
extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);
|
|
extern void *set_vi_handler (int n, void *addr);
|
|
extern void *set_vi_srs_handler (int n, void *addr, int regset);
|
|
extern void *set_except_vector(int n, void *addr);
|
|
extern void per_cpu_trap_init(void);
|
|
|
|
extern NORET_TYPE void die(const char *, struct pt_regs *);
|
|
|
|
static inline void die_if_kernel(const char *str, struct pt_regs *regs)
|
|
{
|
|
if (unlikely(!user_mode(regs)))
|
|
die(str, regs);
|
|
}
|
|
|
|
extern int stop_a_enabled;
|
|
|
|
/*
|
|
* See include/asm-ia64/system.h; prevents deadlock on SMP
|
|
* systems.
|
|
*/
|
|
#define __ARCH_WANT_UNLOCKED_CTXSW
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
#endif /* _ASM_SYSTEM_H */
|