1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * Copyright (C) 2012 Freescale Semiconductor,
4 */
5
6 #include <linux/export.h>
7 #include <linux/threads.h>
8 #include <asm/epapr_hcalls.h>
9 #include <asm/reg.h>
10 #include <asm/page.h>
11 #include <asm/cputable.h>
12 #include <asm/thread_info.h>
13 #include <asm/ppc_asm.h>
14 #include <asm/asm-compat.h>
15 #include <asm/asm-offsets.h>
16
17 #ifndef CONFIG_PPC64
18 /* epapr_ev_idle() was derived from e500_idle(
19 _GLOBAL(epapr_ev_idle)
20 PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set
21 ori r4, r4,_TLF_NAPPING /* so
22 PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it
23
24 #ifdef CONFIG_BOOKE
25 wrteei 1
26 #else
27 mfmsr r4
28 ori r4, r4, MSR_EE
29 mtmsr r4
30 #endif
31
32 idle_loop:
33 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN
34
35 .global epapr_ev_idle_start
36 epapr_ev_idle_start:
37 li r3, -1
38 nop
39 nop
40 nop
41
42 /*
43 * Guard against spurious wakeups from
44 * only interrupt will cause us to ret
45 * _TLF_NAPPING.
46 */
47 b idle_loop
48 #endif
49
50 /* Hypercall entry point. Will be patched with
51 .global epapr_hypercall_start
52 epapr_hypercall_start:
53 li r3, -1
54 nop
55 nop
56 nop
57 blr
58 EXPORT_SYMBOL(epapr_hypercall_start)
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