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x86: introduce vsmp paravirt helpers 

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ravikiran Thirumalai <kiran@scalemp.com>
Acked-by: Shai Fultheim <shai@scalemp.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber Costa 2008-02-11 17:16:04 -02:00 committed by Ingo Molnar
parent 2785c8d052
commit 96597fd2be
2 changed files with 58 additions and 1 deletions
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3
arch/x86/Kconfig
View File

@ -328,7 +328,8 @@ config X86_RDC321X
config X86_VSMP config X86_VSMP
bool "Support for ScaleMP vSMP" bool "Support for ScaleMP vSMP"
depends on X86_64 && PCI depends on X86_64 && PCI
help select PARAVIRT
help
Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
supposed to run on these EM64T-based machines. Only choose this option supposed to run on these EM64T-based machines. Only choose this option
if you have one of these machines. if you have one of these machines.

56
arch/x86/kernel/vsmp_64.c
View File

@ -8,6 +8,8 @@
* *
* Ravikiran Thirumalai <kiran@scalemp.com>, * Ravikiran Thirumalai <kiran@scalemp.com>,
* Shai Fultheim <shai@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> #include <linux/init.h>
@ -15,6 +17,60 @@
#include <linux/pci_regs.h> #include <linux/pci_regs.h>
#include <asm/pci-direct.h> #include <asm/pci-direct.h>
#include <asm/io.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) void __init vsmp_init(void)
{ {