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+/*
+ * 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/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 thiswhere 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 { \
+ (last) = resume(prev, next, next->thread_info); \
+} while(0)
+
+#define ROT_IN_PIECES \
+ " .set noreorder \n" \
+ " .set reorder \n"
+
+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__(
+ "1: ll %0, %3 # xchg_u32 \n"
+ " move %2, %z4 \n"
+ " sc %2, %1 \n"
+ " beqzl %2, 1b \n"
+ ROT_IN_PIECES
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ : "=&r" (retval), "=m" (*m), "=&r" (dummy)
+ : "R" (*m), "Jr" (val)
+ : "memory");
+ } else if (cpu_has_llsc) {
+ unsigned long dummy;
+
+ __asm__ __volatile__(
+ "1: ll %0, %3 # xchg_u32 \n"
+ " move %2, %z4 \n"
+ " sc %2, %1 \n"
+ " beqz %2, 1b \n"
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ : "=&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_MIPS64
+static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
+{
+ __u64 retval;
+
+ if (cpu_has_llsc && R10000_LLSC_WAR) {
+ unsigned long dummy;
+
+ __asm__ __volatile__(
+ "1: lld %0, %3 # xchg_u64 \n"
+ " move %2, %z4 \n"
+ " scd %2, %1 \n"
+ " beqzl %2, 1b \n"
+ ROT_IN_PIECES
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ : "=&r" (retval), "=m" (*m), "=&r" (dummy)
+ : "R" (*m), "Jr" (val)
+ : "memory");
+ } else if (cpu_has_llsc) {
+ unsigned long dummy;
+
+ __asm__ __volatile__(
+ "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
+ : "=&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 noat \n"
+ "1: ll %0, %2 # __cmpxchg_u32 \n"
+ " bne %0, %z3, 2f \n"
+ " move $1, %z4 \n"
+ " sc $1, %1 \n"
+ " beqzl $1, 1b \n"
+ ROT_IN_PIECES
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ "2: \n"
+ " .set at \n"
+ : "=&r" (retval), "=m" (*m)
+ : "R" (*m), "Jr" (old), "Jr" (new)
+ : "memory");
+ } else if (cpu_has_llsc) {
+ __asm__ __volatile__(
+ " .set noat \n"
+ "1: ll %0, %2 # __cmpxchg_u32 \n"
+ " bne %0, %z3, 2f \n"
+ " move $1, %z4 \n"
+ " sc $1, %1 \n"
+ " beqz $1, 1b \n"
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ "2: \n"
+ " .set at \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_MIPS64
+static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
+ unsigned long new)
+{
+ __u64 retval;
+
+ if (cpu_has_llsc) {
+ __asm__ __volatile__(
+ " .set noat \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"
+ ROT_IN_PIECES
+#ifdef CONFIG_SMP
+ " sync \n"
+#endif
+ "2: \n"
+ " .set at \n"
+ : "=&r" (retval), "=m" (*m)
+ : "R" (*m), "Jr" (old), "Jr" (new)
+ : "memory");
+ } else if (cpu_has_llsc) {
+ __asm__ __volatile__(
+ " .set noat \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 at \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_except_vector(int n, void *addr);
+extern void per_cpu_trap_init(void);
+
+extern NORET_TYPE void __die(const char *, struct pt_regs *, const char *file,
+ const char *func, unsigned long line);
+extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
+ const char *func, unsigned long line);
+
+#define die(msg, regs) \
+ __die(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
+#define die_if_kernel(msg, regs) \
+ __die_if_kernel(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
+
+extern int stop_a_enabled;
+
+/*
+ * Taken from include/asm-ia64/system.h; prevents deadlock on SMP
+ * systems.
+ */
+#define prepare_arch_switch(rq, next) \
+do { \
+ spin_lock(&(next)->switch_lock); \
+ spin_unlock(&(rq)->lock); \
+} while (0)
+#define finish_arch_switch(rq, prev) spin_unlock_irq(&(prev)->switch_lock)
+#define task_running(rq, p) ((rq)->curr == (p) || spin_is_locked(&(p)->switch_lock))
+
+#define arch_align_stack(x) (x)
+
+#endif /* _ASM_SYSTEM_H */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.