xref: /openbmc/linux/arch/sparc/kernel/helpers.S (revision 457c8996)
1/* SPDX-License-Identifier: GPL-2.0-only */
2	.align	32
3	.globl	__flushw_user
4	.type	__flushw_user,#function
5__flushw_user:
6	rdpr	%otherwin, %g1
7	brz,pn	%g1, 2f
8	 clr	%g2
91:	save	%sp, -128, %sp
10	rdpr	%otherwin, %g1
11	brnz,pt	%g1, 1b
12	 add	%g2, 1, %g2
131:	sub	%g2, 1, %g2
14	brnz,pt	%g2, 1b
15	 restore %g0, %g0, %g0
162:	retl
17	 nop
18	.size	__flushw_user,.-__flushw_user
19EXPORT_SYMBOL(__flushw_user)
20
21	/* Flush %fp and %i7 to the stack for all register
22	 * windows active inside of the cpu.  This allows
23	 * show_stack_trace() to avoid using an expensive
24	 * 'flushw'.
25	 */
26	.globl		stack_trace_flush
27	.type		stack_trace_flush,#function
28stack_trace_flush:
29	rdpr		%pstate, %o0
30	wrpr		%o0, PSTATE_IE, %pstate
31
32	rdpr		%cwp, %g1
33	rdpr		%canrestore, %g2
34	sub		%g1, 1, %g3
35
361:	brz,pn		%g2, 2f
37	 sub		%g2, 1, %g2
38	wrpr		%g3, %cwp
39	stx		%fp, [%sp + STACK_BIAS + RW_V9_I6]
40	stx		%i7, [%sp + STACK_BIAS + RW_V9_I7]
41	ba,pt		%xcc, 1b
42	 sub		%g3, 1, %g3
43
442:	wrpr		%g1, %cwp
45	wrpr		%o0, %pstate
46
47	retl
48	 nop
49	.size		stack_trace_flush,.-stack_trace_flush
50
51#ifdef CONFIG_SMP
52	.globl		hard_smp_processor_id
53	.type		hard_smp_processor_id,#function
54hard_smp_processor_id:
55#endif
56	.globl		real_hard_smp_processor_id
57	.type		real_hard_smp_processor_id,#function
58real_hard_smp_processor_id:
59	__GET_CPUID(%o0)
60	retl
61	 nop
62#ifdef CONFIG_SMP
63	.size		hard_smp_processor_id,.-hard_smp_processor_id
64#endif
65	.size		real_hard_smp_processor_id,.-real_hard_smp_processor_id
66EXPORT_SYMBOL_GPL(real_hard_smp_processor_id)
67