projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 867e359b CM |
1 | /* |
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
| 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, version 2. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, but | |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for | |
| 12 | * more details. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/linkage.h> | |
| 0707ad30 | 16 | #include <linux/unistd.h> |
| 867e359b | 17 | #include <asm/irqflags.h> |
| a78c942d | 18 | #include <asm/processor.h> |
| 0707ad30 | 19 | #include <arch/abi.h> |
| a78c942d | 20 | #include <arch/spr_def.h> |
| 867e359b CM |
21 | |
| 22 | #ifdef __tilegx__ | |
| 23 | #define bnzt bnezt | |
| 24 | #endif | |
| 25 | ||
| 26 | STD_ENTRY(current_text_addr) | |
| 27 | { move r0, lr; jrp lr } | |
| 28 | STD_ENDPROC(current_text_addr) | |
| 29 | ||
| 867e359b CM |
30 | STD_ENTRY(KBacktraceIterator_init_current) |
| 31 | { move r2, lr; lnk r1 } | |
| 32 | { move r4, r52; addli r1, r1, KBacktraceIterator_init_current - . } | |
| 33 | { move r3, sp; j _KBacktraceIterator_init_current } | |
| 34 | jrp lr /* keep backtracer happy */ | |
| 35 | STD_ENDPROC(KBacktraceIterator_init_current) | |
| 867e359b CM |
36 | |
| 37 | /* Loop forever on a nap during SMP boot. */ | |
| 38 | STD_ENTRY(smp_nap) | |
| 39 | nap | |
| 8c92ba6c | 40 | nop /* avoid provoking the icache prefetch with a jump */ |
| 867e359b CM |
41 | j smp_nap /* we are not architecturally guaranteed not to exit nap */ |
| 42 | jrp lr /* clue in the backtracer */ | |
| 43 | STD_ENDPROC(smp_nap) | |
| 44 | ||
| 45 | /* | |
| 46 | * Enable interrupts racelessly and then nap until interrupted. | |
| 0b989cac CM |
47 | * Architecturally, we are guaranteed that enabling interrupts via |
| 48 | * mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC. | |
| 867e359b CM |
49 | * This function's _cpu_idle_nap address is special; see intvec.S. |
| 50 | * When interrupted at _cpu_idle_nap, we bump the PC forward 8, and | |
| 51 | * as a result return to the function that called _cpu_idle(). | |
| 52 | */ | |
| 53 | STD_ENTRY(_cpu_idle) | |
| 0b989cac | 54 | movei r1, 1 |
| 51007004 | 55 | IRQ_ENABLE_LOAD(r2, r3) |
| 0b989cac | 56 | mtspr INTERRUPT_CRITICAL_SECTION, r1 |
| 51007004 | 57 | IRQ_ENABLE_APPLY(r2, r3) /* unmask, but still with ICS set */ |
| 0b989cac | 58 | mtspr INTERRUPT_CRITICAL_SECTION, zero |
| 867e359b CM |
59 | .global _cpu_idle_nap |
| 60 | _cpu_idle_nap: | |
| 61 | nap | |
| 8c92ba6c | 62 | nop /* avoid provoking the icache prefetch with a jump */ |
| 867e359b CM |
63 | jrp lr |
| 64 | STD_ENDPROC(_cpu_idle) |