diff options
Diffstat (limited to 'usr/src/uts/i86pc/os/cpuid.c')
| -rw-r--r-- | usr/src/uts/i86pc/os/cpuid.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/usr/src/uts/i86pc/os/cpuid.c b/usr/src/uts/i86pc/os/cpuid.c index 09707f151c..0a389e0063 100644 --- a/usr/src/uts/i86pc/os/cpuid.c +++ b/usr/src/uts/i86pc/os/cpuid.c @@ -20,6 +20,7 @@ */ /* * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2011 by Delphix. All rights reserved. */ /* * Copyright (c) 2010, Intel Corporation. @@ -590,13 +591,22 @@ cpuid_free_space(cpu_t *cpu) #if !defined(__xpv) -static void -determine_platform() +/* + * Determine the type of the underlying platform. This is used to customize + * initialization of various subsystems (e.g. TSC). determine_platform() must + * only ever be called once to prevent two processors from seeing different + * values of platform_type, it must be called before cpuid_pass1(), the + * earliest consumer to execute. + */ +void +determine_platform(void) { struct cpuid_regs cp; char *xen_str; uint32_t xen_signature[4], base; + ASSERT(platform_type == -1); + platform_type = HW_NATIVE; if (!enable_platform_detection) @@ -633,9 +643,7 @@ determine_platform() int get_hwenv(void) { - if (platform_type == -1) - determine_platform(); - + ASSERT(platform_type != -1); return (platform_type); } @@ -870,9 +878,6 @@ cpuid_pass1(cpu_t *cpu, uchar_t *featureset) extern int idle_cpu_prefer_mwait; #endif -#if !defined(__xpv) - determine_platform(); -#endif /* * Space statically allocated for BSP, ensure pointer is set */ |