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

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
...@@ -328,6 +328,7 @@ config X86_RDC321X ...@@ -328,6 +328,7 @@ 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
select PARAVIRT
help 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
......
...@@ -8,6 +8,8 @@ ...@@ -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 @@ ...@@ -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)
{ {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment