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Commit 96597fd2 authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar
Browse files

x86: introduce vsmp paravirt helpers 



Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarRavikiran Thirumalai <kiran@scalemp.com>
Acked-by: default avatarShai Fultheim <shai@scalemp.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 2785c8d0

arch/x86/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -328,6 +328,7 @@ config X86_RDC321X 
config X86_VSMP

	bool "Support for ScaleMP vSMP"

	depends on X86_64 && PCI

	select PARAVIRT

	help

	  Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is

	  supposed to run on these EM64T-based machines.  Only choose this option

arch/x86/kernel/vsmp_64.c

+56 −0
Original line number Diff line number Diff line
@@ -8,6 +8,8 @@ 
 *

 * Ravikiran Thirumalai <kiran@scalemp.com>,

 * Shai Fultheim <shai@scalemp.com>

 * Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,

 *			     Ravikiran Thirumalai <kiran@scalemp.com>

 */



#include <linux/init.h>
@@ -15,6 +17,60 @@ 
#include <linux/pci_regs.h>

#include <asm/pci-direct.h>

#include <asm/io.h>

#include <asm/paravirt.h>



/*

 * Interrupt control on vSMPowered systems:

 * ~AC is a shadow of IF.  If IF is 'on' AC should be 'off'

 * and vice versa.

 */



static unsigned long vsmp_save_fl(void)

{

	unsigned long flags = native_save_fl();



	if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))

		flags &= ~X86_EFLAGS_IF;

	return flags;

}



static void vsmp_restore_fl(unsigned long flags)

{

	if (flags & X86_EFLAGS_IF)

		flags &= ~X86_EFLAGS_AC;

	else

		flags |= X86_EFLAGS_AC;

	native_restore_fl(flags);

}



static void vsmp_irq_disable(void)

{

	unsigned long flags = native_save_fl();



	native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);

}



static void vsmp_irq_enable(void)

{

	unsigned long flags = native_save_fl();



	native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));

}



static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,

				  unsigned long addr, unsigned len)

{

	switch (type) {

	case PARAVIRT_PATCH(pv_irq_ops.irq_enable):

	case PARAVIRT_PATCH(pv_irq_ops.irq_disable):

	case PARAVIRT_PATCH(pv_irq_ops.save_fl):

	case PARAVIRT_PATCH(pv_irq_ops.restore_fl):

		return paravirt_patch_default(type, clobbers, ibuf, addr, len);

	default:

		return native_patch(type, clobbers, ibuf, addr, len);

	}



}



void __init vsmp_init(void)

{