projects / deliverable / linux.git / blame
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|---|---|---|
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1 | /* |
| 2 | * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| 3 | * | |
| 4 | * Generic idle routine for Book3E processors | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public License | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the License, or (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/threads.h> | |
| 13 | #include <asm/reg.h> | |
| 14 | #include <asm/ppc_asm.h> | |
| 15 | #include <asm/asm-offsets.h> | |
| 16 | #include <asm/ppc-opcode.h> | |
| 17 | #include <asm/processor.h> | |
| 18 | #include <asm/thread_info.h> | |
| f070986a | 19 | #include <asm/epapr_hcalls.h> |
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20 | |
| 21 | /* 64-bit version only for now */ | |
| 22 | #ifdef CONFIG_PPC64 | |
| 23 | ||
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24 | .macro BOOK3E_IDLE name loop |
| 25 | _GLOBAL(\name) | |
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26 | /* Save LR for later */ |
| 27 | mflr r0 | |
| 28 | std r0,16(r1) | |
| 29 | ||
| 30 | /* Hard disable interrupts */ | |
| 31 | wrteei 0 | |
| 32 | ||
| 33 | /* Now check if an interrupt came in while we were soft disabled | |
| 7230c564 | 34 | * since we may otherwise lose it (doorbells etc...). |
| 34d97e07 | 35 | */ |
| 7230c564 | 36 | lbz r3,PACAIRQHAPPENED(r13) |
| 34d97e07 | 37 | cmpwi cr0,r3,0 |
| 7230c564 | 38 | bnelr |
| 34d97e07 | 39 | |
| 7230c564 | 40 | /* Now we are going to mark ourselves as soft and hard enabled in |
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41 | * order to be able to take interrupts while asleep. We inform lockdep |
| 42 | * of that. We don't actually turn interrupts on just yet tho. | |
| 43 | */ | |
| 44 | #ifdef CONFIG_TRACE_IRQFLAGS | |
| 45 | stdu r1,-128(r1) | |
| b1576fec | 46 | bl trace_hardirqs_on |
| 7230c564 | 47 | addi r1,r1,128 |
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48 | #endif |
| 49 | li r0,1 | |
| 50 | stb r0,PACASOFTIRQEN(r13) | |
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51 | |
| 52 | /* Interrupts will make use return to LR, so get something we want | |
| 53 | * in there | |
| 54 | */ | |
| 55 | bl 1f | |
| 56 | ||
| 7230c564 | 57 | /* And return (interrupts are on) */ |
| 34d97e07 BH |
58 | ld r0,16(r1) |
| 59 | mtlr r0 | |
| 60 | blr | |
| 61 | ||
| 62 | 1: /* Let's set the _TLF_NAPPING flag so interrupts make us return | |
| 63 | * to the right spot | |
| 64 | */ | |
| 9778b696 | 65 | CURRENT_THREAD_INFO(r11, r1) |
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66 | ld r10,TI_LOCAL_FLAGS(r11) |
| 67 | ori r10,r10,_TLF_NAPPING | |
| 68 | std r10,TI_LOCAL_FLAGS(r11) | |
| 69 | ||
| 70 | /* We can now re-enable hard interrupts and go to sleep */ | |
| 71 | wrteei 1 | |
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72 | \loop |
| 73 | ||
| 74 | .endm | |
| 75 | ||
| 76 | .macro BOOK3E_IDLE_LOOP | |
| 77 | 1: | |
| 78 | PPC_WAIT(0) | |
| 34d97e07 | 79 | b 1b |
| f070986a SY |
80 | .endm |
| 81 | ||
| 82 | /* epapr_ev_idle_start below is patched with the proper hcall | |
| 83 | opcodes during kernel initialization */ | |
| 84 | .macro EPAPR_EV_IDLE_LOOP | |
| 85 | idle_loop: | |
| 86 | LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) | |
| 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 book3e_idle BOOK3E_IDLE_LOOP | |
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100 | |
| 101 | #endif /* CONFIG_PPC64 */ |