| Stephen Rothwell | c111d0b | 2005-09-28 13:28:01 +1000 | [diff] [blame^] | 1 | /* |
| 2 | * This file contains miscellaneous low-level functions. |
| 3 | * Copyright (C) 1995-2005 IBM Corp |
| 4 | * |
| 5 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) |
| 6 | * and Paul Mackerras. |
| 7 | * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) |
| 8 | * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <asm/processor.h> |
| 17 | #include <asm/asm-offsets.h> |
| 18 | |
| 19 | .text |
| 20 | |
| 21 | /* unsigned long local_save_flags(void) */ |
| 22 | _GLOBAL(local_get_flags) |
| 23 | lbz r3,PACAPROCENABLED(r13) |
| 24 | blr |
| 25 | |
| 26 | /* unsigned long local_irq_disable(void) */ |
| 27 | _GLOBAL(local_irq_disable) |
| 28 | lbz r3,PACAPROCENABLED(r13) |
| 29 | li r4,0 |
| 30 | stb r4,PACAPROCENABLED(r13) |
| 31 | blr /* Done */ |
| 32 | |
| 33 | /* void local_irq_restore(unsigned long flags) */ |
| 34 | _GLOBAL(local_irq_restore) |
| 35 | lbz r5,PACAPROCENABLED(r13) |
| 36 | /* Check if things are setup the way we want _already_. */ |
| 37 | cmpw 0,r3,r5 |
| 38 | beqlr |
| 39 | /* are we enabling interrupts? */ |
| 40 | cmpdi 0,r3,0 |
| 41 | stb r3,PACAPROCENABLED(r13) |
| 42 | beqlr |
| 43 | /* Check pending interrupts */ |
| 44 | /* A decrementer, IPI or PMC interrupt may have occurred |
| 45 | * while we were in the hypervisor (which enables) */ |
| 46 | ld r4,PACALPPACA+LPPACAANYINT(r13) |
| 47 | cmpdi r4,0 |
| 48 | beqlr |
| 49 | |
| 50 | /* |
| 51 | * Handle pending interrupts in interrupt context |
| 52 | */ |
| 53 | li r0,0x5555 |
| 54 | sc |
| 55 | blr |