xref: /openbmc/linux/arch/sparc/kernel/helpers.S (revision 8730046c)
1	.align	32
2	.globl	__flushw_user
3	.type	__flushw_user,#function
4__flushw_user:
5	rdpr	%otherwin, %g1
6	brz,pn	%g1, 2f
7	 clr	%g2
81:	save	%sp, -128, %sp
9	rdpr	%otherwin, %g1
10	brnz,pt	%g1, 1b
11	 add	%g2, 1, %g2
121:	sub	%g2, 1, %g2
13	brnz,pt	%g2, 1b
14	 restore %g0, %g0, %g0
152:	retl
16	 nop
17	.size	__flushw_user,.-__flushw_user
18EXPORT_SYMBOL(__flushw_user)
19
20	/* Flush %fp and %i7 to the stack for all register
21	 * windows active inside of the cpu.  This allows
22	 * show_stack_trace() to avoid using an expensive
23	 * 'flushw'.
24	 */
25	.globl		stack_trace_flush
26	.type		stack_trace_flush,#function
27stack_trace_flush:
28	rdpr		%pstate, %o0
29	wrpr		%o0, PSTATE_IE, %pstate
30
31	rdpr		%cwp, %g1
32	rdpr		%canrestore, %g2
33	sub		%g1, 1, %g3
34
351:	brz,pn		%g2, 2f
36	 sub		%g2, 1, %g2
37	wrpr		%g3, %cwp
38	stx		%fp, [%sp + STACK_BIAS + RW_V9_I6]
39	stx		%i7, [%sp + STACK_BIAS + RW_V9_I7]
40	ba,pt		%xcc, 1b
41	 sub		%g3, 1, %g3
42
432:	wrpr		%g1, %cwp
44	wrpr		%o0, %pstate
45
46	retl
47	 nop
48	.size		stack_trace_flush,.-stack_trace_flush
49
50#ifdef CONFIG_SMP
51	.globl		hard_smp_processor_id
52	.type		hard_smp_processor_id,#function
53hard_smp_processor_id:
54#endif
55	.globl		real_hard_smp_processor_id
56	.type		real_hard_smp_processor_id,#function
57real_hard_smp_processor_id:
58	__GET_CPUID(%o0)
59	retl
60	 nop
61#ifdef CONFIG_SMP
62	.size		hard_smp_processor_id,.-hard_smp_processor_id
63#endif
64	.size		real_hard_smp_processor_id,.-real_hard_smp_processor_id
65EXPORT_SYMBOL_GPL(real_hard_smp_processor_id)
66