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[IA64] pvops: preparation: introduce ia64_get_psr_i() to make kernel paravirtualization friendly. 

__local_irq_save() and local_save_flags() are used to mask interruptions.
They read all psr bits that requres whole bit emulation.
On the other hand, reading only psr.i, the single bit, can be virtualized
cheaply.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2008-05-19 22:13:31 +09:00 committed by Tony Luck
parent 0e1a77ccdb
commit 72cb4256c7
2 changed files with 10 additions and 2 deletions
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2
include/asm-ia64/intrinsics.h
View File

@ -18,6 +18,8 @@
# include <asm/gcc_intrin.h>
#endif
#define ia64_get_psr_i() (ia64_getreg(_IA64_REG_PSR) & IA64_PSR_I)
#define ia64_set_rr0_to_rr4(val0, val1, val2, val3, val4) \
do { \
ia64_set_rr(0x0000000000000000UL, (val0)); \

10
include/asm-ia64/system.h
View File

@ -123,10 +123,16 @@ extern struct ia64_boot_param {
* write a floating-point register right before reading the PSR
* and that writes to PSR.mfl
*/
#ifdef CONFIG_PARAVIRT
#define __local_save_flags() ia64_get_psr_i()
#else
#define __local_save_flags() ia64_getreg(_IA64_REG_PSR)
#endif
#define __local_irq_save(x) \
do { \
ia64_stop(); \
(x) = ia64_getreg(_IA64_REG_PSR); \
(x) = __local_save_flags(); \
ia64_stop(); \
ia64_rsm(IA64_PSR_I); \
} while (0)
@ -174,7 +180,7 @@ do { \
#endif /* !CONFIG_IA64_DEBUG_IRQ */
#define local_irq_enable() ({ ia64_stop(); ia64_ssm(IA64_PSR_I); ia64_srlz_d(); })
#define local_save_flags(flags) ({ ia64_stop(); (flags) = ia64_getreg(_IA64_REG_PSR); })
#define local_save_flags(flags) ({ ia64_stop(); (flags) = __local_save_flags(); })
#define irqs_disabled() \
({ \