Commit | Line | Data |
---|---|---|
948cf67c | 1 | /* |
7230c564 | 2 | * This file contains the power_save function for Power7 CPUs. |
948cf67c BH |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/threads.h> | |
11 | #include <asm/processor.h> | |
12 | #include <asm/page.h> | |
13 | #include <asm/cputable.h> | |
14 | #include <asm/thread_info.h> | |
15 | #include <asm/ppc_asm.h> | |
16 | #include <asm/asm-offsets.h> | |
17 | #include <asm/ppc-opcode.h> | |
7230c564 | 18 | #include <asm/hw_irq.h> |
f0888f70 | 19 | #include <asm/kvm_book3s_asm.h> |
948cf67c BH |
20 | |
21 | #undef DEBUG | |
22 | ||
23 | .text | |
24 | ||
25 | _GLOBAL(power7_idle) | |
26 | /* Now check if user or arch enabled NAP mode */ | |
27 | LOAD_REG_ADDRBASE(r3,powersave_nap) | |
28 | lwz r4,ADDROFF(powersave_nap)(r3) | |
29 | cmpwi 0,r4,0 | |
30 | beqlr | |
375f561a | 31 | /* fall through */ |
948cf67c | 32 | |
375f561a | 33 | _GLOBAL(power7_nap) |
948cf67c BH |
34 | /* NAP is a state loss, we create a regs frame on the |
35 | * stack, fill it up with the state we care about and | |
36 | * stick a pointer to it in PACAR1. We really only | |
37 | * need to save PC, some CR bits and the NV GPRs, | |
38 | * but for now an interrupt frame will do. | |
39 | */ | |
40 | mflr r0 | |
41 | std r0,16(r1) | |
42 | stdu r1,-INT_FRAME_SIZE(r1) | |
43 | std r0,_LINK(r1) | |
44 | std r0,_NIP(r1) | |
45 | ||
46 | #ifndef CONFIG_SMP | |
47 | /* Make sure FPU, VSX etc... are flushed as we may lose | |
48 | * state when going to nap mode | |
49 | */ | |
50 | bl .discard_lazy_cpu_state | |
51 | #endif /* CONFIG_SMP */ | |
52 | ||
53 | /* Hard disable interrupts */ | |
54 | mfmsr r9 | |
55 | rldicl r9,r9,48,1 | |
56 | rotldi r9,r9,16 | |
57 | mtmsrd r9,1 /* hard-disable interrupts */ | |
7230c564 BH |
58 | |
59 | /* Check if something happened while soft-disabled */ | |
60 | lbz r0,PACAIRQHAPPENED(r13) | |
61 | cmpwi cr0,r0,0 | |
62 | beq 1f | |
63 | addi r1,r1,INT_FRAME_SIZE | |
64 | ld r0,16(r1) | |
65 | mtlr r0 | |
66 | blr | |
67 | ||
68 | 1: /* We mark irqs hard disabled as this is the state we'll | |
69 | * be in when returning and we need to tell arch_local_irq_restore() | |
70 | * about it | |
71 | */ | |
72 | li r0,PACA_IRQ_HARD_DIS | |
73 | stb r0,PACAIRQHAPPENED(r13) | |
74 | ||
75 | /* We haven't lost state ... yet */ | |
948cf67c | 76 | li r0,0 |
2fde6d20 | 77 | stb r0,PACA_NAPSTATELOST(r13) |
948cf67c BH |
78 | |
79 | /* Continue saving state */ | |
80 | SAVE_GPR(2, r1) | |
81 | SAVE_NVGPRS(r1) | |
82 | mfcr r3 | |
83 | std r3,_CCR(r1) | |
84 | std r9,_MSR(r1) | |
85 | std r1,PACAR1(r13) | |
86 | ||
1c51089f | 87 | _GLOBAL(power7_enter_nap_mode) |
9975f5e3 | 88 | #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE |
f0888f70 PM |
89 | /* Tell KVM we're napping */ |
90 | li r4,KVM_HWTHREAD_IN_NAP | |
91 | stb r4,HSTATE_HWTHREAD_STATE(r13) | |
92 | #endif | |
93 | ||
948cf67c BH |
94 | /* Magic NAP mode enter sequence */ |
95 | std r0,0(r1) | |
96 | ptesync | |
97 | ld r0,0(r1) | |
98 | 1: cmp cr0,r0,r0 | |
99 | bne 1b | |
100 | PPC_NAP | |
101 | b . | |
102 | ||
103 | _GLOBAL(power7_wakeup_loss) | |
948cf67c BH |
104 | ld r1,PACAR1(r13) |
105 | REST_NVGPRS(r1) | |
106 | REST_GPR(2, r1) | |
107 | ld r3,_CCR(r1) | |
108 | ld r4,_MSR(r1) | |
109 | ld r5,_NIP(r1) | |
110 | addi r1,r1,INT_FRAME_SIZE | |
111 | mtcr r3 | |
112 | mtspr SPRN_SRR1,r4 | |
113 | mtspr SPRN_SRR0,r5 | |
114 | rfid | |
115 | ||
116 | _GLOBAL(power7_wakeup_noloss) | |
2fde6d20 PM |
117 | lbz r0,PACA_NAPSTATELOST(r13) |
118 | cmpwi r0,0 | |
119 | bne .power7_wakeup_loss | |
948cf67c BH |
120 | ld r1,PACAR1(r13) |
121 | ld r4,_MSR(r1) | |
122 | ld r5,_NIP(r1) | |
123 | addi r1,r1,INT_FRAME_SIZE | |
124 | mtspr SPRN_SRR1,r4 | |
125 | mtspr SPRN_SRR0,r5 | |
126 | rfid |