arch/sparc/kernel/helpers.S

Source file repositories/reference/linux-study-clean/arch/sparc/kernel/helpers.S

File Facts

System: Linux kernel
Corpus path: arch/sparc/kernel/helpers.S
Extension: .S
Size: 1477 bytes
Lines: 67
Domain: Architecture Layer
Bucket: arch/sparc
Inferred role: Architecture Layer: exported/initcall integration point
Status: integration 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.

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

export __flushw_user
export real_hard_smp_processor_id

Annotated Snippet

.align	32
	.globl	__flushw_user
	.type	__flushw_user,#function
__flushw_user:
	rdpr	%otherwin, %g1
	brz,pn	%g1, 2f
	 clr	%g2
1:	save	%sp, -128, %sp
	rdpr	%otherwin, %g1
	brnz,pt	%g1, 1b
	 add	%g2, 1, %g2
1:	sub	%g2, 1, %g2
	brnz,pt	%g2, 1b
	 restore %g0, %g0, %g0
2:	retl
	 nop
	.size	__flushw_user,.-__flushw_user
EXPORT_SYMBOL(__flushw_user)

	/* Flush %fp and %i7 to the stack for all register
	 * windows active inside of the cpu.  This allows
	 * show_stack_trace() to avoid using an expensive
	 * 'flushw'.
	 */
	.globl		stack_trace_flush
	.type		stack_trace_flush,#function
stack_trace_flush:
	rdpr		%pstate, %o0
	wrpr		%o0, PSTATE_IE, %pstate

	rdpr		%cwp, %g1
	rdpr		%canrestore, %g2
	sub		%g1, 1, %g3

1:	brz,pn		%g2, 2f
	 sub		%g2, 1, %g2
	wrpr		%g3, %cwp
	stx		%fp, [%sp + STACK_BIAS + RW_V9_I6]
	stx		%i7, [%sp + STACK_BIAS + RW_V9_I7]
	ba,pt		%xcc, 1b
	 sub		%g3, 1, %g3

2:	wrpr		%g1, %cwp
	wrpr		%o0, %pstate

	retl
	 nop
	.size		stack_trace_flush,.-stack_trace_flush

#ifdef CONFIG_SMP
	.globl		hard_smp_processor_id
	.type		hard_smp_processor_id,#function
hard_smp_processor_id:
#endif
	.globl		real_hard_smp_processor_id
	.type		real_hard_smp_processor_id,#function
real_hard_smp_processor_id:
	__GET_CPUID(%o0)
	retl
	 nop
#ifdef CONFIG_SMP
	.size		hard_smp_processor_id,.-hard_smp_processor_id
#endif
	.size		real_hard_smp_processor_id,.-real_hard_smp_processor_id
EXPORT_SYMBOL_GPL(real_hard_smp_processor_id)

Annotation

Detected declarations: `export __flushw_user`, `export real_hard_smp_processor_id`.
Atlas domain: Architecture Layer / arch/sparc.
Implementation status: integration implementation candidate.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.