diff options
Diffstat (limited to 'arch/powerpc/kernel/idle_book3e.S')
| -rw-r--r-- | arch/powerpc/kernel/idle_book3e.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_book3e.S b/arch/powerpc/kernel/idle_book3e.S new file mode 100644 index 00000000000..16c002d6bdf --- /dev/null +++ b/arch/powerpc/kernel/idle_book3e.S @@ -0,0 +1,86 @@ +/* + * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> + * + * Generic idle routine for Book3E processors + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/threads.h> +#include <asm/reg.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ppc-opcode.h> +#include <asm/processor.h> +#include <asm/thread_info.h> + +/* 64-bit version only for now */ +#ifdef CONFIG_PPC64 + +_GLOBAL(book3e_idle) + /* Save LR for later */ + mflr r0 + std r0,16(r1) + + /* Hard disable interrupts */ + wrteei 0 + + /* Now check if an interrupt came in while we were soft disabled + * since we may otherwise lose it (doorbells etc...). We know + * that since PACAHARDIRQEN will have been cleared in that case. + */ + lbz r3,PACAHARDIRQEN(r13) + cmpwi cr0,r3,0 + beqlr + + /* Now we are going to mark ourselves as soft and hard enables in + * order to be able to take interrupts while asleep. We inform lockdep + * of that. We don't actually turn interrupts on just yet tho. + */ +#ifdef CONFIG_TRACE_IRQFLAGS + stdu r1,-128(r1) + bl .trace_hardirqs_on +#endif + li r0,1 + stb r0,PACASOFTIRQEN(r13) + stb r0,PACAHARDIRQEN(r13) + + /* Interrupts will make use return to LR, so get something we want + * in there + */ + bl 1f + + /* Hard disable interrupts again */ + wrteei 0 + + /* Mark them off again in the PACA as well */ + li r0,0 + stb r0,PACASOFTIRQEN(r13) + stb r0,PACAHARDIRQEN(r13) + + /* Tell lockdep about it */ +#ifdef CONFIG_TRACE_IRQFLAGS + bl .trace_hardirqs_off + addi r1,r1,128 +#endif + ld r0,16(r1) + mtlr r0 + blr + +1: /* Let's set the _TLF_NAPPING flag so interrupts make us return + * to the right spot + */ + clrrdi r11,r1,THREAD_SHIFT + ld r10,TI_LOCAL_FLAGS(r11) + ori r10,r10,_TLF_NAPPING + std r10,TI_LOCAL_FLAGS(r11) + + /* We can now re-enable hard interrupts and go to sleep */ + wrteei 1 +1: PPC_WAIT(0) + b 1b + +#endif /* CONFIG_PPC64 */ |