1 #ifndef _ASM_X86_ACPI_H 2 #define _ASM_X86_ACPI_H 3 4 #ifdef CONFIG_X86_32 5 # include "acpi_32.h" 6 #else 7 # include "acpi_64.h" 8 #endif 9 10 #include <asm/processor.h> 11 12 /* 13 * Check if the CPU can handle C2 and deeper 14 */ acpi_processor_cstate_check(unsigned int max_cstate)15static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate) 16 { 17 /* 18 * Early models (<=5) of AMD Opterons are not supposed to go into 19 * C2 state. 20 * 21 * Steppings 0x0A and later are good 22 */ 23 if (boot_cpu_data.x86 == 0x0F && 24 boot_cpu_data.x86_vendor == X86_VENDOR_AMD && 25 boot_cpu_data.x86_model <= 0x05 && 26 boot_cpu_data.x86_mask < 0x0A) 27 return 1; 28 else 29 return max_cstate; 30 } 31 32 #endif 33