arch/powerpc/include/asm/cputhreads.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/cputhreads.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/cputhreads.h
Extension
.h
Size
2862 bytes
Lines
116
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
static inline int cpu_first_thread_of_core(int core) { return core; }
#endif

static inline int cpu_thread_in_core(int cpu)
{
	return cpu & (threads_per_core - 1);
}

static inline int cpu_thread_in_subcore(int cpu)
{
	return cpu & (threads_per_subcore - 1);
}

static inline int cpu_first_thread_sibling(int cpu)
{
	return cpu & ~(threads_per_core - 1);
}

static inline int cpu_last_thread_sibling(int cpu)
{
	return cpu | (threads_per_core - 1);
}

/*
 * tlb_thread_siblings are siblings which share a TLB. This is not
 * architected, is not something a hypervisor could emulate and a future
 * CPU may change behaviour even in compat mode, so this should only be
 * used on PowerNV, and only with care.
 */
static inline int cpu_first_tlb_thread_sibling(int cpu)
{
	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
		return cpu & ~0x6;	/* Big Core */
	else
		return cpu_first_thread_sibling(cpu);
}

static inline int cpu_last_tlb_thread_sibling(int cpu)
{
	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
		return cpu | 0x6;	/* Big Core */
	else
		return cpu_last_thread_sibling(cpu);
}

static inline int cpu_tlb_thread_sibling_step(void)
{
	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
		return 2;		/* Big Core */
	else
		return 1;
}

static inline u32 get_tensr(void)
{
#ifdef	CONFIG_BOOKE
	if (cpu_has_feature(CPU_FTR_SMT))
		return mfspr(SPRN_TENSR);
#endif
	return 1;
}

void book3e_start_thread(int thread, unsigned long addr);
void book3e_stop_thread(int thread);

#endif /* __ASSEMBLER__ */

#define INVALID_THREAD_HWID	0x0fff

#endif /* _ASM_POWERPC_CPUTHREADS_H */

Annotation

Implementation Notes