1 #ifndef __ASM_SMP_H 2 #define __ASM_SMP_H 3 4 /* 5 * We need the APIC definitions automatically as part of 'smp.h' 6 */ 7 #ifndef __ASSEMBLY__ 8 #include <linux/config.h> 9 #include <linux/threads.h> 10 #include <linux/ptrace.h> 11 #endif 12 13 #ifdef CONFIG_X86_LOCAL_APIC 14 #ifndef __ASSEMBLY__ 15 #include <asm/fixmap.h> 16 #include <asm/bitops.h> 17 #include <asm/mpspec.h> 18 #ifdef CONFIG_X86_IO_APIC 19 #include <asm/io_apic.h> 20 #endif 21 #include <asm/apic.h> 22 #endif 23 #endif 24 25 #ifdef CONFIG_SMP 26 #ifndef __ASSEMBLY__ 27 28 /* 29 * Private routines/data 30 */ 31 32 extern void smp_alloc_memory(void); 33 extern unsigned long phys_cpu_present_map; 34 extern unsigned long cpu_online_map; 35 extern volatile unsigned long smp_invalidate_needed; 36 extern int pic_mode; 37 extern int smp_num_siblings; 38 extern int cpu_sibling_map[]; 39 40 extern void smp_flush_tlb(void); 41 extern void smp_message_irq(int cpl, void *dev_id, struct pt_regs *regs); 42 extern void fastcall smp_send_reschedule(int cpu); 43 extern void smp_invalidate_rcv(void); /* Process an NMI */ 44 extern void (*mtrr_hook) (void); 45 extern void zap_low_mappings (void); 46 47 /* 48 * On x86 all CPUs are mapped 1:1 to the APIC space. 49 * This simplifies scheduling and IPI sending and 50 * compresses data structures. 51 */ cpu_logical_map(int cpu)52static inline int cpu_logical_map(int cpu) 53 { 54 return cpu; 55 } cpu_number_map(int cpu)56static inline int cpu_number_map(int cpu) 57 { 58 return cpu; 59 } 60 61 /* 62 * Some lowlevel functions might want to know about 63 * the real APIC ID <-> CPU # mapping. 64 */ 65 #define MAX_APICID 256 66 extern volatile int cpu_to_physical_apicid[NR_CPUS]; 67 extern volatile int physical_apicid_to_cpu[MAX_APICID]; 68 extern volatile int cpu_to_logical_apicid[NR_CPUS]; 69 extern volatile int logical_apicid_to_cpu[MAX_APICID]; 70 71 /* 72 * General functions that each host system must provide. 73 */ 74 75 extern void smp_boot_cpus(void); 76 extern void smp_store_cpu_info(int id); /* Store per CPU info (like the initial udelay numbers */ 77 78 /* 79 * This function is needed by all SMP systems. It must _always_ be valid 80 * from the initial startup. We map APIC_BASE very early in page_setup(), 81 * so this is correct in the x86 case. 82 */ 83 84 #define smp_processor_id() (current->processor) 85 hard_smp_processor_id(void)86static __inline int hard_smp_processor_id(void) 87 { 88 /* we don't want to mark this access volatile - bad code generation */ 89 return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID)); 90 } 91 logical_smp_processor_id(void)92static __inline int logical_smp_processor_id(void) 93 { 94 /* we don't want to mark this access volatile - bad code generation */ 95 return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR)); 96 } 97 98 #endif /* !__ASSEMBLY__ */ 99 100 #define NO_PROC_ID 0xFF /* No processor magic marker */ 101 102 /* 103 * This magic constant controls our willingness to transfer 104 * a process across CPUs. Such a transfer incurs misses on the L1 105 * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My 106 * gut feeling is this will vary by board in value. For a board 107 * with separate L2 cache it probably depends also on the RSS, and 108 * for a board with shared L2 cache it ought to decay fast as other 109 * processes are run. 110 */ 111 112 #define PROC_CHANGE_PENALTY 15 /* Schedule penalty */ 113 114 #endif 115 #endif 116