- #ifndef __ASM_SMP_H
- #define __ASM_SMP_H
- /*
- * We need the APIC definitions automatically as part of 'smp.h'
- */
- #ifndef __ASSEMBLY__
- #include <linux/config.h>
- #include <linux/threads.h>
- #include <linux/ptrace.h>
- #endif
- #ifdef CONFIG_X86_LOCAL_APIC
- #ifndef __ASSEMBLY__
- #include <asm/fixmap.h>
- #include <asm/bitops.h>
- #include <asm/mpspec.h>
- #ifdef CONFIG_X86_IO_APIC
- #include <asm/io_apic.h>
- #endif
- #include <asm/apic.h>
- #endif
- #endif
- #ifdef CONFIG_SMP
- #ifndef __ASSEMBLY__
- /*
- * Private routines/data
- */
- extern void smp_alloc_memory(void);
- extern unsigned long phys_cpu_present_map;
- extern unsigned long cpu_online_map;
- extern volatile unsigned long smp_invalidate_needed;
- extern int pic_mode;
- extern int smp_num_siblings;
- extern int cpu_sibling_map[];
- extern void smp_flush_tlb(void);
- extern void smp_message_irq(int cpl, void *dev_id, struct pt_regs *regs);
- extern void smp_send_reschedule(int cpu);
- extern void smp_invalidate_rcv(void); /* Process an NMI */
- extern void (*mtrr_hook) (void);
- extern void zap_low_mappings (void);
- /*
- * On x86 all CPUs are mapped 1:1 to the APIC space.
- * This simplifies scheduling and IPI sending and
- * compresses data structures.
- */
- static inline int cpu_logical_map(int cpu)
- {
- return cpu;
- }
- static inline int cpu_number_map(int cpu)
- {
- return cpu;
- }
- /*
- * Some lowlevel functions might want to know about
- * the real APIC ID <-> CPU # mapping.
- */
- #define MAX_APICID 256
- extern volatile int cpu_to_physical_apicid[NR_CPUS];
- extern volatile int physical_apicid_to_cpu[MAX_APICID];
- extern volatile int cpu_to_logical_apicid[NR_CPUS];
- extern volatile int logical_apicid_to_cpu[MAX_APICID];
- /*
- * General functions that each host system must provide.
- */
- extern void smp_boot_cpus(void);
- extern void smp_store_cpu_info(int id); /* Store per CPU info (like the initial udelay numbers */
- /*
- * This function is needed by all SMP systems. It must _always_ be valid
- * from the initial startup. We map APIC_BASE very early in page_setup(),
- * so this is correct in the x86 case.
- */
- #define smp_processor_id() (current->processor)
- static __inline int hard_smp_processor_id(void)
- {
- /* we don't want to mark this access volatile - bad code generation */
- return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
- }
- static __inline int logical_smp_processor_id(void)
- {
- /* we don't want to mark this access volatile - bad code generation */
- return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
- }
- #endif /* !__ASSEMBLY__ */
- #define NO_PROC_ID 0xFF /* No processor magic marker */
- /*
- * This magic constant controls our willingness to transfer
- * a process across CPUs. Such a transfer incurs misses on the L1
- * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
- * gut feeling is this will vary by board in value. For a board
- * with separate L2 cache it probably depends also on the RSS, and
- * for a board with shared L2 cache it ought to decay fast as other
- * processes are run.
- */
- #define PROC_CHANGE_PENALTY 15 /* Schedule penalty */
- #endif
- #endif