diff options
Diffstat (limited to 'arch/um/include')
| -rw-r--r-- | arch/um/include/asm/system-i386.h | 6 | ||||
| -rw-r--r-- | arch/um/include/asm/system-ppc.h | 12 | ||||
| -rw-r--r-- | arch/um/include/asm/system-x86_64.h | 23 | ||||
| -rw-r--r-- | arch/um/include/asm/system.h (renamed from arch/um/include/asm/system-generic.h) | 14 | ||||
| -rw-r--r-- | arch/um/include/shared/sysdep-i386/system.h | 132 | ||||
| -rw-r--r-- | arch/um/include/shared/sysdep-x86_64/system.h | 132 |
6 files changed, 265 insertions, 54 deletions
diff --git a/arch/um/include/asm/system-i386.h b/arch/um/include/asm/system-i386.h deleted file mode 100644 index c436263e67ba..000000000000 --- a/arch/um/include/asm/system-i386.h +++ /dev/null @@ -1,6 +0,0 @@ -#ifndef __UM_SYSTEM_I386_H -#define __UM_SYSTEM_I386_H - -#include "asm/system-generic.h" - -#endif diff --git a/arch/um/include/asm/system-ppc.h b/arch/um/include/asm/system-ppc.h deleted file mode 100644 index 17cde6640bf5..000000000000 --- a/arch/um/include/asm/system-ppc.h +++ /dev/null @@ -1,12 +0,0 @@ -#ifndef __UM_SYSTEM_PPC_H -#define __UM_SYSTEM_PPC_H - -#define _switch_to _ppc_switch_to - -#include "asm/arch/system.h" - -#undef _switch_to - -#include "asm/system-generic.h" - -#endif diff --git a/arch/um/include/asm/system-x86_64.h b/arch/um/include/asm/system-x86_64.h deleted file mode 100644 index e1b61b580734..000000000000 --- a/arch/um/include/asm/system-x86_64.h +++ /dev/null @@ -1,23 +0,0 @@ -/* - * Copyright 2003 PathScale, Inc. - * - * Licensed under the GPL - */ - -#ifndef __UM_SYSTEM_X86_64_H -#define __UM_SYSTEM_X86_64_H - -#include "asm/system-generic.h" - -#endif - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/include/asm/system-generic.h b/arch/um/include/asm/system.h index 5bcfa35e7a22..753346e2cdfd 100644 --- a/arch/um/include/asm/system-generic.h +++ b/arch/um/include/asm/system.h @@ -1,19 +1,7 @@ #ifndef __UM_SYSTEM_GENERIC_H #define __UM_SYSTEM_GENERIC_H -#include "asm/arch/system.h" - -#undef switch_to -#undef local_irq_save -#undef local_irq_restore -#undef local_irq_disable -#undef local_irq_enable -#undef local_save_flags -#undef local_irq_restore -#undef local_irq_enable -#undef local_irq_disable -#undef local_irq_save -#undef irqs_disabled +#include "sysdep/system.h" extern void *switch_to(void *prev, void *next, void *last); diff --git a/arch/um/include/shared/sysdep-i386/system.h b/arch/um/include/shared/sysdep-i386/system.h new file mode 100644 index 000000000000..d1b93c436200 --- /dev/null +++ b/arch/um/include/shared/sysdep-i386/system.h @@ -0,0 +1,132 @@ +#ifndef _ASM_X86_SYSTEM_H_ +#define _ASM_X86_SYSTEM_H_ + +#include <asm/asm.h> +#include <asm/segment.h> +#include <asm/cpufeature.h> +#include <asm/cmpxchg.h> +#include <asm/nops.h> + +#include <linux/kernel.h> +#include <linux/irqflags.h> + +/* entries in ARCH_DLINFO: */ +#ifdef CONFIG_IA32_EMULATION +# define AT_VECTOR_SIZE_ARCH 2 +#else +# define AT_VECTOR_SIZE_ARCH 1 +#endif + +extern unsigned long arch_align_stack(unsigned long sp); + +void default_idle(void); + +/* + * Force strict CPU ordering. + * And yes, this is required on UP too when we're talking + * to devices. + */ +#ifdef CONFIG_X86_32 +/* + * Some non-Intel clones support out of order store. wmb() ceases to be a + * nop for these. + */ +#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2) +#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2) +#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM) +#else +#define mb() asm volatile("mfence":::"memory") +#define rmb() asm volatile("lfence":::"memory") +#define wmb() asm volatile("sfence" ::: "memory") +#endif + +/** + * 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_SMP +#define smp_mb() mb() +#ifdef CONFIG_X86_PPRO_FENCE +# define smp_rmb() rmb() +#else +# define smp_rmb() barrier() +#endif +#ifdef CONFIG_X86_OOSTORE +# define smp_wmb() wmb() +#else +# define smp_wmb() barrier() +#endif +#define smp_read_barrier_depends() read_barrier_depends() +#define set_mb(var, value) do { (void)xchg(&var, value); } while (0) +#else +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() +#define smp_read_barrier_depends() do { } while (0) +#define set_mb(var, value) do { var = value; barrier(); } while (0) +#endif + +/* + * Stop RDTSC speculation. This is needed when you need to use RDTSC + * (or get_cycles or vread that possibly accesses the TSC) in a defined + * code region. + * + * (Could use an alternative three way for this if there was one.) + */ +static inline void rdtsc_barrier(void) +{ + alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC); + alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC); +} + +#endif diff --git a/arch/um/include/shared/sysdep-x86_64/system.h b/arch/um/include/shared/sysdep-x86_64/system.h new file mode 100644 index 000000000000..d1b93c436200 --- /dev/null +++ b/arch/um/include/shared/sysdep-x86_64/system.h @@ -0,0 +1,132 @@ +#ifndef _ASM_X86_SYSTEM_H_ +#define _ASM_X86_SYSTEM_H_ + +#include <asm/asm.h> +#include <asm/segment.h> +#include <asm/cpufeature.h> +#include <asm/cmpxchg.h> +#include <asm/nops.h> + +#include <linux/kernel.h> +#include <linux/irqflags.h> + +/* entries in ARCH_DLINFO: */ +#ifdef CONFIG_IA32_EMULATION +# define AT_VECTOR_SIZE_ARCH 2 +#else +# define AT_VECTOR_SIZE_ARCH 1 +#endif + +extern unsigned long arch_align_stack(unsigned long sp); + +void default_idle(void); + +/* + * Force strict CPU ordering. + * And yes, this is required on UP too when we're talking + * to devices. + */ +#ifdef CONFIG_X86_32 +/* + * Some non-Intel clones support out of order store. wmb() ceases to be a + * nop for these. + */ +#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2) +#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2) +#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM) +#else +#define mb() asm volatile("mfence":::"memory") +#define rmb() asm volatile("lfence":::"memory") +#define wmb() asm volatile("sfence" ::: "memory") +#endif + +/** + * 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_SMP +#define smp_mb() mb() +#ifdef CONFIG_X86_PPRO_FENCE +# define smp_rmb() rmb() +#else +# define smp_rmb() barrier() +#endif +#ifdef CONFIG_X86_OOSTORE +# define smp_wmb() wmb() +#else +# define smp_wmb() barrier() +#endif +#define smp_read_barrier_depends() read_barrier_depends() +#define set_mb(var, value) do { (void)xchg(&var, value); } while (0) +#else +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() +#define smp_read_barrier_depends() do { } while (0) +#define set_mb(var, value) do { var = value; barrier(); } while (0) +#endif + +/* + * Stop RDTSC speculation. This is needed when you need to use RDTSC + * (or get_cycles or vread that possibly accesses the TSC) in a defined + * code region. + * + * (Could use an alternative three way for this if there was one.) + */ +static inline void rdtsc_barrier(void) +{ + alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC); + alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC); +} + +#endif |