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yaml --- r: 136716 b: refs/heads/master c: 5393744 h: refs/heads/master v: v3
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Jeremy Fitzhardinge
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H. Peter Anvin
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Feb 5, 2009
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--- | ||
refs/heads/master: 383414322b3b3ced0cbc146801e0cc6c60a6c5f4 | ||
refs/heads/master: 5393744b71ce797f1b1546fafaed127fc50c2b61 |
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/* | ||
Asm versions of Xen pv-ops, suitable for either direct use or inlining. | ||
The inline versions are the same as the direct-use versions, with the | ||
pre- and post-amble chopped off. | ||
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This code is encoded for size rather than absolute efficiency, | ||
with a view to being able to inline as much as possible. | ||
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We only bother with direct forms (ie, vcpu in percpu data) of | ||
the operations here; the indirect forms are better handled in | ||
C, since they're generally too large to inline anyway. | ||
*/ | ||
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#include <asm/asm-offsets.h> | ||
#include <asm/percpu.h> | ||
#include <asm/processor-flags.h> | ||
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#include "xen-asm.h" | ||
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/* | ||
Enable events. This clears the event mask and tests the pending | ||
event status with one and operation. If there are pending | ||
events, then enter the hypervisor to get them handled. | ||
*/ | ||
ENTRY(xen_irq_enable_direct) | ||
/* Unmask events */ | ||
movb $0, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask | ||
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/* Preempt here doesn't matter because that will deal with | ||
any pending interrupts. The pending check may end up being | ||
run on the wrong CPU, but that doesn't hurt. */ | ||
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/* Test for pending */ | ||
testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending | ||
jz 1f | ||
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2: call check_events | ||
1: | ||
ENDPATCH(xen_irq_enable_direct) | ||
ret | ||
ENDPROC(xen_irq_enable_direct) | ||
RELOC(xen_irq_enable_direct, 2b+1) | ||
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/* | ||
Disabling events is simply a matter of making the event mask | ||
non-zero. | ||
*/ | ||
ENTRY(xen_irq_disable_direct) | ||
movb $1, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask | ||
ENDPATCH(xen_irq_disable_direct) | ||
ret | ||
ENDPROC(xen_irq_disable_direct) | ||
RELOC(xen_irq_disable_direct, 0) | ||
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/* | ||
(xen_)save_fl is used to get the current interrupt enable status. | ||
Callers expect the status to be in X86_EFLAGS_IF, and other bits | ||
may be set in the return value. We take advantage of this by | ||
making sure that X86_EFLAGS_IF has the right value (and other bits | ||
in that byte are 0), but other bits in the return value are | ||
undefined. We need to toggle the state of the bit, because | ||
Xen and x86 use opposite senses (mask vs enable). | ||
*/ | ||
ENTRY(xen_save_fl_direct) | ||
testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask | ||
setz %ah | ||
addb %ah,%ah | ||
ENDPATCH(xen_save_fl_direct) | ||
ret | ||
ENDPROC(xen_save_fl_direct) | ||
RELOC(xen_save_fl_direct, 0) | ||
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/* | ||
In principle the caller should be passing us a value return | ||
from xen_save_fl_direct, but for robustness sake we test only | ||
the X86_EFLAGS_IF flag rather than the whole byte. After | ||
setting the interrupt mask state, it checks for unmasked | ||
pending events and enters the hypervisor to get them delivered | ||
if so. | ||
*/ | ||
ENTRY(xen_restore_fl_direct) | ||
#ifdef CONFIG_X86_64 | ||
testw $X86_EFLAGS_IF, %di | ||
#else | ||
testb $X86_EFLAGS_IF>>8, %ah | ||
#endif | ||
setz PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask | ||
/* Preempt here doesn't matter because that will deal with | ||
any pending interrupts. The pending check may end up being | ||
run on the wrong CPU, but that doesn't hurt. */ | ||
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/* check for unmasked and pending */ | ||
cmpw $0x0001, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending | ||
jz 1f | ||
2: call check_events | ||
1: | ||
ENDPATCH(xen_restore_fl_direct) | ||
ret | ||
ENDPROC(xen_restore_fl_direct) | ||
RELOC(xen_restore_fl_direct, 2b+1) | ||
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/* | ||
Force an event check by making a hypercall, | ||
but preserve regs before making the call. | ||
*/ | ||
check_events: | ||
#ifdef CONFIG_X86_32 | ||
push %eax | ||
push %ecx | ||
push %edx | ||
call xen_force_evtchn_callback | ||
pop %edx | ||
pop %ecx | ||
pop %eax | ||
#else | ||
push %rax | ||
push %rcx | ||
push %rdx | ||
push %rsi | ||
push %rdi | ||
push %r8 | ||
push %r9 | ||
push %r10 | ||
push %r11 | ||
call xen_force_evtchn_callback | ||
pop %r11 | ||
pop %r10 | ||
pop %r9 | ||
pop %r8 | ||
pop %rdi | ||
pop %rsi | ||
pop %rdx | ||
pop %rcx | ||
pop %rax | ||
#endif | ||
ret | ||
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#ifndef _XEN_XEN_ASM_H | ||
#define _XEN_XEN_ASM_H | ||
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#include <linux/linkage.h> | ||
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#define RELOC(x, v) .globl x##_reloc; x##_reloc=v | ||
#define ENDPATCH(x) .globl x##_end; x##_end=. | ||
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/* Pseudo-flag used for virtual NMI, which we don't implement yet */ | ||
#define XEN_EFLAGS_NMI 0x80000000 | ||
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#endif |
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