Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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> |
Chris Metcalf | 0707ad3 | 2010-06-25 17:04:17 -0400 | [diff] [blame] | 16 | #include <linux/unistd.h> |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 17 | #include <asm/irqflags.h> |
Chris Metcalf | a78c942 | 2010-10-14 16:23:03 -0400 | [diff] [blame] | 18 | #include <asm/processor.h> |
Chris Metcalf | 0707ad3 | 2010-06-25 17:04:17 -0400 | [diff] [blame] | 19 | #include <arch/abi.h> |
Chris Metcalf | a78c942 | 2010-10-14 16:23:03 -0400 | [diff] [blame] | 20 | #include <arch/spr_def.h> |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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) |
| 36 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 37 | /* Loop forever on a nap during SMP boot. */ |
| 38 | STD_ENTRY(smp_nap) |
| 39 | nap |
Chris Metcalf | 8c92ba6 | 2012-03-29 15:57:18 -0400 | [diff] [blame] | 40 | nop /* avoid provoking the icache prefetch with a jump */ |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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. |
Chris Metcalf | 0b989ca | 2011-02-28 15:22:40 -0500 | [diff] [blame] | 47 | * Architecturally, we are guaranteed that enabling interrupts via |
| 48 | * mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC. |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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 | */ |
Chris Metcalf | 6727ad9 | 2016-10-07 17:02:55 -0700 | [diff] [blame] | 53 | STD_ENTRY_SECTION(_cpu_idle, .cpuidle.text) |
Chris Metcalf | 0b989ca | 2011-02-28 15:22:40 -0500 | [diff] [blame] | 54 | movei r1, 1 |
Chris Metcalf | 5100700 | 2012-03-27 15:40:20 -0400 | [diff] [blame] | 55 | IRQ_ENABLE_LOAD(r2, r3) |
Chris Metcalf | 0b989ca | 2011-02-28 15:22:40 -0500 | [diff] [blame] | 56 | mtspr INTERRUPT_CRITICAL_SECTION, r1 |
Chris Metcalf | 5100700 | 2012-03-27 15:40:20 -0400 | [diff] [blame] | 57 | IRQ_ENABLE_APPLY(r2, r3) /* unmask, but still with ICS set */ |
Chris Metcalf | 0b989ca | 2011-02-28 15:22:40 -0500 | [diff] [blame] | 58 | mtspr INTERRUPT_CRITICAL_SECTION, zero |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 59 | .global _cpu_idle_nap |
| 60 | _cpu_idle_nap: |
| 61 | nap |
Chris Metcalf | 8c92ba6 | 2012-03-29 15:57:18 -0400 | [diff] [blame] | 62 | nop /* avoid provoking the icache prefetch with a jump */ |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 63 | jrp lr |
| 64 | STD_ENDPROC(_cpu_idle) |