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powerpc: Add paravirt idle loop for 64-bit Book-E

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Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Stuart Yoder 2013-02-08 13:22:56 -06:00 committed by Kumar Gala
parent 19c29f1747
commit f070986a07
2 changed files with 32 additions and 2 deletions
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2
arch/powerpc/kernel/epapr_hcalls.S
View File

@ -17,6 +17,7 @@
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>
#ifndef CONFIG_PPC64
/* epapr_ev_idle() was derived from e500_idle() */
_GLOBAL(epapr_ev_idle)
CURRENT_THREAD_INFO(r3, r1)
@ -42,6 +43,7 @@ epapr_ev_idle_start:
* _TLF_NAPPING.
*/
b idle_loop
#endif
/* Hypercall entry point. Will be patched with device tree instructions. */
.global epapr_hypercall_start

32
arch/powerpc/kernel/idle_book3e.S
View File

@ -16,11 +16,13 @@
#include <asm/ppc-opcode.h>
#include <asm/processor.h>
#include <asm/thread_info.h>
#include <asm/epapr_hcalls.h>
/* 64-bit version only for now */
#ifdef CONFIG_PPC64
_GLOBAL(book3e_idle)
.macro BOOK3E_IDLE name loop
_GLOBAL(\name)
/* Save LR for later */
mflr r0
std r0,16(r1)
@ -67,7 +69,33 @@ _GLOBAL(book3e_idle)
/* We can now re-enable hard interrupts and go to sleep */
wrteei 1
1: PPC_WAIT(0)
\loop
.endm
.macro BOOK3E_IDLE_LOOP
1:
PPC_WAIT(0)
b 1b
.endm
/* epapr_ev_idle_start below is patched with the proper hcall
opcodes during kernel initialization */
.macro EPAPR_EV_IDLE_LOOP
idle_loop:
LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
.global epapr_ev_idle_start
epapr_ev_idle_start:
li r3, -1
nop
nop
nop
b idle_loop
.endm
BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP
BOOK3E_IDLE book3e_idle BOOK3E_IDLE_LOOP
#endif /* CONFIG_PPC64 */