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powerpc: export debug registers save function for KVM

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KVM need this function when switching from vcpu to user-space
thread. My subsequent patch will use this function.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Bharat Bhushan 2013-07-04 12:27:44 +05:30 committed by Scott Wood
parent 51ae8d4a2b
commit 3743c9b8ce
2 changed files with 3 additions and 1 deletions
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1
arch/powerpc/include/asm/switch_to.h
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@ -35,6 +35,7 @@ extern void giveup_vsx(struct task_struct *);
extern void enable_kernel_spe(void); extern void enable_kernel_spe(void);
extern void giveup_spe(struct task_struct *); extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *); extern void load_up_spe(struct task_struct *);
extern void switch_booke_debug_regs(struct thread_struct *new_thread);
#ifndef CONFIG_SMP #ifndef CONFIG_SMP
extern void discard_lazy_cpu_state(void); extern void discard_lazy_cpu_state(void);

3
arch/powerpc/kernel/process.c
View File

@ -371,12 +371,13 @@ static void prime_debug_regs(struct thread_struct *thread)
* debug registers, set the debug registers from the values * debug registers, set the debug registers from the values
* stored in the new thread. * stored in the new thread.
*/ */
static void switch_booke_debug_regs(struct thread_struct *new_thread) void switch_booke_debug_regs(struct thread_struct *new_thread)
{ {
if ((current->thread.debug.dbcr0 & DBCR0_IDM) if ((current->thread.debug.dbcr0 & DBCR0_IDM)
|| (new_thread->debug.dbcr0 & DBCR0_IDM)) || (new_thread->debug.dbcr0 & DBCR0_IDM))
prime_debug_regs(new_thread); prime_debug_regs(new_thread);
} }
EXPORT_SYMBOL_GPL(switch_booke_debug_regs);
#else /* !CONFIG_PPC_ADV_DEBUG_REGS */ #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
#ifndef CONFIG_HAVE_HW_BREAKPOINT #ifndef CONFIG_HAVE_HW_BREAKPOINT
static void set_debug_reg_defaults(struct thread_struct *thread) static void set_debug_reg_defaults(struct thread_struct *thread)