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| author | Isaku Yamahata <yamahata@valinux.co.jp> | 2008-05-19 22:13:31 +0900 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-05-27 14:39:07 -0700 |
| commit | 72cb4256c7574e1c2c1350fa92eecd7cef9e4772 (patch) | |
| tree | 56d2872fafa5965816d339f3cea9ff06e288c1d1 /include/asm-ia64 | |
| parent | 0e1a77ccdbc4ca59ccaf84168a0c3c1df4fadfc0 (diff) | |
| download | linux-72cb4256c7574e1c2c1350fa92eecd7cef9e4772.tar.gz linux-72cb4256c7574e1c2c1350fa92eecd7cef9e4772.tar.bz2 linux-72cb4256c7574e1c2c1350fa92eecd7cef9e4772.zip | |
[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>
Diffstat (limited to 'include/asm-ia64')
| -rw-r--r-- | include/asm-ia64/intrinsics.h | 2 | ||||
| -rw-r--r-- | include/asm-ia64/system.h | 10 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/asm-ia64/intrinsics.h b/include/asm-ia64/intrinsics.h index 9b83f8f01678..a3b96892f83f 100644 --- a/include/asm-ia64/intrinsics.h +++ b/include/asm-ia64/intrinsics.h @@ -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)); \ diff --git a/include/asm-ia64/system.h b/include/asm-ia64/system.h index 0db8c9812ceb..927a381c20ca 100644 --- a/include/asm-ia64/system.h +++ b/include/asm-ia64/system.h @@ -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() \ ({ \ |