1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * Copyright 2010 IBM Corp, Benjamin Herrensch<
4 *
5 * Generic idle routine for 64 bits e500 proce
6 */
7
8 #include <linux/threads.h>
9 #include <asm/reg.h>
10 #include <asm/ppc_asm.h>
11 #include <asm/asm-offsets.h>
12 #include <asm/ppc-opcode.h>
13 #include <asm/processor.h>
14 #include <asm/thread_info.h>
15 #include <asm/epapr_hcalls.h>
16 #include <asm/hw_irq.h>
17
18 /* 64-bit version only for now */
19 .macro BOOK3E_IDLE name loop
20 _GLOBAL(\name)
21 /* Save LR for later */
22 mflr r0
23 std r0,16(r1)
24
25 /* Hard disable interrupts */
26 wrteei 0
27
28 /* Now check if an interrupt came in w
29 * since we may otherwise lose it (doo
30 */
31 lbz r3,PACAIRQHAPPENED(r13)
32 cmpwi cr0,r3,0
33 bne 2f
34
35 /* Now we are going to mark ourselves
36 * order to be able to take interrupts
37 * of that. We don't actually turn int
38 */
39 #ifdef CONFIG_TRACE_IRQFLAGS
40 stdu r1,-128(r1)
41 bl trace_hardirqs_on
42 addi r1,r1,128
43 #endif
44 li r0,IRQS_ENABLED
45 stb r0,PACAIRQSOFTMASK(r13)
46
47 /* Interrupts will make use return to
48 * in there
49 */
50 bl 1f
51
52 /* And return (interrupts are on) */
53 ld r0,16(r1)
54 mtlr r0
55 blr
56
57 1: /* Let's set the _TLF_NAPPING flag so
58 * to the right spot
59 */
60 ld r11, PACACURRENT(r13)
61 ld r10,TI_LOCAL_FLAGS(r11)
62 ori r10,r10,_TLF_NAPPING
63 std r10,TI_LOCAL_FLAGS(r11)
64
65 /* We can now re-enable hard interrupt
66 wrteei 1
67 \loop
68
69 2:
70 lbz r10,PACAIRQHAPPENED(r13)
71 ori r10,r10,PACA_IRQ_HARD_DIS
72 stb r10,PACAIRQHAPPENED(r13)
73 blr
74 .endm
75
76 .macro BOOK3E_IDLE_LOOP
77 1:
78 PPC_WAIT_v203
79 b 1b
80 .endm
81
82 /* epapr_ev_idle_start below is patched with t
83 opcodes during kernel initialization */
84 .macro EPAPR_EV_IDLE_LOOP
85 idle_loop:
86 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN
87
88 .global epapr_ev_idle_start
89 epapr_ev_idle_start:
90 li r3, -1
91 nop
92 nop
93 nop
94 b idle_loop
95 .endm
96
97 BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP
98
99 BOOK3E_IDLE e500_idle BOOK3E_IDLE_LOOP
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