x86, um: get rid of system.h -> system.h include
Long-term we want to split system.h and include barriers part from underlying target; for now copy that part to sysdep. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>wifi-calibration
Al Viro
H. Peter Anvin
parent
32926b3be1
commit
6a0eec8224
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@ -19,7 +19,7 @@ core-y += $(ARCH_DIR)/kernel/ \
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$(ARCH_DIR)/os-$(OS)/
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# Have to precede the include because the included Makefiles reference them.
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SYMLINK_HEADERS := archparam.h system.h processor.h ptrace.h \
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SYMLINK_HEADERS := archparam.h processor.h ptrace.h \
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module.h vm-flags.h elf.h
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SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),$(ARCH_DIR)/include/asm/$(header))
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@ -1,6 +0,0 @@
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#ifndef __UM_SYSTEM_I386_H
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#define __UM_SYSTEM_I386_H
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#include "asm/system-generic.h"
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#endif
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@ -1,12 +0,0 @@
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#ifndef __UM_SYSTEM_PPC_H
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#define __UM_SYSTEM_PPC_H
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#define _switch_to _ppc_switch_to
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#include "asm/arch/system.h"
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#undef _switch_to
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#include "asm/system-generic.h"
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#endif
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@ -1,23 +0,0 @@
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/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#ifndef __UM_SYSTEM_X86_64_H
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#define __UM_SYSTEM_X86_64_H
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#include "asm/system-generic.h"
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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@ -1,19 +1,7 @@
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#ifndef __UM_SYSTEM_GENERIC_H
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#define __UM_SYSTEM_GENERIC_H
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#include "asm/arch/system.h"
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#undef switch_to
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#undef local_irq_save
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#undef local_irq_restore
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#undef local_irq_disable
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#undef local_irq_enable
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#undef local_save_flags
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#undef local_irq_restore
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#undef local_irq_enable
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#undef local_irq_disable
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#undef local_irq_save
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#undef irqs_disabled
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#include "sysdep/system.h"
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extern void *switch_to(void *prev, void *next, void *last);
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@ -0,0 +1,132 @@
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#ifndef _ASM_X86_SYSTEM_H_
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#define _ASM_X86_SYSTEM_H_
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#include <asm/asm.h>
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#include <asm/segment.h>
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#include <asm/cpufeature.h>
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#include <asm/cmpxchg.h>
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#include <asm/nops.h>
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#include <linux/kernel.h>
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#include <linux/irqflags.h>
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/* entries in ARCH_DLINFO: */
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#ifdef CONFIG_IA32_EMULATION
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# define AT_VECTOR_SIZE_ARCH 2
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#else
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# define AT_VECTOR_SIZE_ARCH 1
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#endif
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extern unsigned long arch_align_stack(unsigned long sp);
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void default_idle(void);
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/*
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* Force strict CPU ordering.
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* And yes, this is required on UP too when we're talking
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* to devices.
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*/
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#ifdef CONFIG_X86_32
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/*
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* Some non-Intel clones support out of order store. wmb() ceases to be a
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* nop for these.
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*/
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#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
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#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
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#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
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#else
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#define mb() asm volatile("mfence":::"memory")
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#define rmb() asm volatile("lfence":::"memory")
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#define wmb() asm volatile("sfence" ::: "memory")
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#endif
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/**
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* read_barrier_depends - Flush all pending reads that subsequents reads
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* depend on.
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*
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* No data-dependent reads from memory-like regions are ever reordered
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* over this barrier. All reads preceding this primitive are guaranteed
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* to access memory (but not necessarily other CPUs' caches) before any
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* reads following this primitive that depend on the data return by
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* any of the preceding reads. This primitive is much lighter weight than
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* rmb() on most CPUs, and is never heavier weight than is
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* rmb().
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*
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* These ordering constraints are respected by both the local CPU
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* and the compiler.
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*
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* Ordering is not guaranteed by anything other than these primitives,
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* not even by data dependencies. See the documentation for
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* memory_barrier() for examples and URLs to more information.
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*
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* For example, the following code would force ordering (the initial
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* value of "a" is zero, "b" is one, and "p" is "&a"):
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* b = 2;
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* memory_barrier();
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* p = &b; q = p;
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* read_barrier_depends();
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* d = *q;
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* </programlisting>
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*
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* because the read of "*q" depends on the read of "p" and these
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* two reads are separated by a read_barrier_depends(). However,
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* the following code, with the same initial values for "a" and "b":
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* a = 2;
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* memory_barrier();
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* b = 3; y = b;
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* read_barrier_depends();
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* x = a;
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* </programlisting>
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*
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* does not enforce ordering, since there is no data dependency between
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* the read of "a" and the read of "b". Therefore, on some CPUs, such
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* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
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* in cases like this where there are no data dependencies.
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**/
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#define read_barrier_depends() do { } while (0)
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#ifdef CONFIG_X86_PPRO_FENCE
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# define smp_rmb() rmb()
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#else
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# define smp_rmb() barrier()
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#endif
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#ifdef CONFIG_X86_OOSTORE
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# define smp_wmb() wmb()
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#else
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# define smp_wmb() barrier()
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#endif
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#define smp_read_barrier_depends() read_barrier_depends()
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#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while (0)
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#define set_mb(var, value) do { var = value; barrier(); } while (0)
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#endif
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/*
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* Stop RDTSC speculation. This is needed when you need to use RDTSC
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* (or get_cycles or vread that possibly accesses the TSC) in a defined
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* code region.
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*
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* (Could use an alternative three way for this if there was one.)
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*/
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static inline void rdtsc_barrier(void)
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{
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alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
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alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
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}
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#endif
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@ -0,0 +1,132 @@
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#ifndef _ASM_X86_SYSTEM_H_
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#define _ASM_X86_SYSTEM_H_
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#include <asm/asm.h>
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#include <asm/segment.h>
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#include <asm/cpufeature.h>
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#include <asm/cmpxchg.h>
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#include <asm/nops.h>
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#include <linux/kernel.h>
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#include <linux/irqflags.h>
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/* entries in ARCH_DLINFO: */
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#ifdef CONFIG_IA32_EMULATION
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# define AT_VECTOR_SIZE_ARCH 2
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#else
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# define AT_VECTOR_SIZE_ARCH 1
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#endif
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extern unsigned long arch_align_stack(unsigned long sp);
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void default_idle(void);
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/*
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* Force strict CPU ordering.
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* And yes, this is required on UP too when we're talking
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* to devices.
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*/
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#ifdef CONFIG_X86_32
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/*
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* Some non-Intel clones support out of order store. wmb() ceases to be a
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* nop for these.
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*/
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#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
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#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
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#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
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#else
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#define mb() asm volatile("mfence":::"memory")
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#define rmb() asm volatile("lfence":::"memory")
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#define wmb() asm volatile("sfence" ::: "memory")
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#endif
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/**
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* read_barrier_depends - Flush all pending reads that subsequents reads
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* depend on.
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*
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* No data-dependent reads from memory-like regions are ever reordered
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* over this barrier. All reads preceding this primitive are guaranteed
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* to access memory (but not necessarily other CPUs' caches) before any
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* reads following this primitive that depend on the data return by
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* any of the preceding reads. This primitive is much lighter weight than
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* rmb() on most CPUs, and is never heavier weight than is
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* rmb().
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*
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* These ordering constraints are respected by both the local CPU
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* and the compiler.
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*
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* Ordering is not guaranteed by anything other than these primitives,
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* not even by data dependencies. See the documentation for
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* memory_barrier() for examples and URLs to more information.
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*
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* For example, the following code would force ordering (the initial
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* value of "a" is zero, "b" is one, and "p" is "&a"):
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* b = 2;
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* memory_barrier();
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* p = &b; q = p;
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* read_barrier_depends();
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* d = *q;
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* </programlisting>
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*
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* because the read of "*q" depends on the read of "p" and these
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* two reads are separated by a read_barrier_depends(). However,
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* the following code, with the same initial values for "a" and "b":
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*
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* <programlisting>
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* CPU 0 CPU 1
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*
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* a = 2;
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* memory_barrier();
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* b = 3; y = b;
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* read_barrier_depends();
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* x = a;
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* </programlisting>
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*
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* does not enforce ordering, since there is no data dependency between
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* the read of "a" and the read of "b". Therefore, on some CPUs, such
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* as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
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* in cases like this where there are no data dependencies.
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**/
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#define read_barrier_depends() do { } while (0)
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#ifdef CONFIG_X86_PPRO_FENCE
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# define smp_rmb() rmb()
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#else
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# define smp_rmb() barrier()
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#endif
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#ifdef CONFIG_X86_OOSTORE
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# define smp_wmb() wmb()
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#else
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# define smp_wmb() barrier()
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#endif
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#define smp_read_barrier_depends() read_barrier_depends()
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#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while (0)
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#define set_mb(var, value) do { var = value; barrier(); } while (0)
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#endif
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/*
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* Stop RDTSC speculation. This is needed when you need to use RDTSC
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* (or get_cycles or vread that possibly accesses the TSC) in a defined
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* code region.
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*
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* (Could use an alternative three way for this if there was one.)
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*/
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static inline void rdtsc_barrier(void)
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{
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alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
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alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
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}
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#endif
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