d3561b7fa0
Create a paravirt.h header for all the critical operations which need to be replaced with hypervisor calls, and include that instead of defining native operations, when CONFIG_PARAVIRT. This patch does the dumbest possible replacement of paravirtualized instructions: calls through a "paravirt_ops" structure. Currently these are function implementations of native hardware: hypervisors will override the ops structure with their own variants. All the pv-ops functions are declared "fastcall" so that a specific register-based ABI is used, to make inlining assember easier. And: +From: Andy Whitcroft <apw@shadowen.org> The paravirt ops introduce a 'weak' attribute onto memory_setup(). Code ordering leads to the following warnings on x86: arch/i386/kernel/setup.c:651: warning: weak declaration of `memory_setup' after first use results in unspecified behavior Move memory_setup() to avoid this. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Andy Whitcroft <apw@shadowen.org>
140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
/*
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* include/asm-i386/irqflags.h
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*
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* IRQ flags handling
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() functions from the lowlevel headers.
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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#ifndef __ASSEMBLY__
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static inline unsigned long __raw_local_save_flags(void)
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{
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unsigned long flags;
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__asm__ __volatile__(
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"pushfl ; popl %0"
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: "=g" (flags)
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: /* no input */
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);
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return flags;
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}
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static inline void raw_local_irq_restore(unsigned long flags)
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{
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__asm__ __volatile__(
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"pushl %0 ; popfl"
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: /* no output */
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:"g" (flags)
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:"memory", "cc"
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);
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}
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static inline void raw_local_irq_disable(void)
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{
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__asm__ __volatile__("cli" : : : "memory");
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}
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static inline void raw_local_irq_enable(void)
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{
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__asm__ __volatile__("sti" : : : "memory");
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}
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/*
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* Used in the idle loop; sti takes one instruction cycle
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* to complete:
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*/
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static inline void raw_safe_halt(void)
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{
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__asm__ __volatile__("sti; hlt" : : : "memory");
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}
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/*
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* Used when interrupts are already enabled or to
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* shutdown the processor:
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*/
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static inline void halt(void)
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{
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__asm__ __volatile__("hlt": : :"memory");
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}
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/*
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* For spinlocks, etc:
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*/
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static inline unsigned long __raw_local_irq_save(void)
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{
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unsigned long flags = __raw_local_save_flags();
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raw_local_irq_disable();
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return flags;
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}
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#else
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#define DISABLE_INTERRUPTS cli
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#define ENABLE_INTERRUPTS sti
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#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
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#define INTERRUPT_RETURN iret
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#define GET_CR0_INTO_EAX movl %cr0, %eax
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PARAVIRT */
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#ifndef __ASSEMBLY__
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#define raw_local_save_flags(flags) \
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do { (flags) = __raw_local_save_flags(); } while (0)
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#define raw_local_irq_save(flags) \
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do { (flags) = __raw_local_irq_save(); } while (0)
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static inline int raw_irqs_disabled_flags(unsigned long flags)
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{
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return !(flags & (1 << 9));
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}
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static inline int raw_irqs_disabled(void)
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{
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unsigned long flags = __raw_local_save_flags();
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return raw_irqs_disabled_flags(flags);
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}
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#endif /* __ASSEMBLY__ */
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/*
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* Do the CPU's IRQ-state tracing from assembly code. We call a
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* C function, so save all the C-clobbered registers:
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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# define TRACE_IRQS_ON \
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pushl %eax; \
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pushl %ecx; \
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pushl %edx; \
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call trace_hardirqs_on; \
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popl %edx; \
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popl %ecx; \
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popl %eax;
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# define TRACE_IRQS_OFF \
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pushl %eax; \
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pushl %ecx; \
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pushl %edx; \
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call trace_hardirqs_off; \
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popl %edx; \
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popl %ecx; \
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popl %eax;
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#else
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# define TRACE_IRQS_ON
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# define TRACE_IRQS_OFF
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#endif
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#endif
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