diff options
| author | Glauber Costa <gcosta@redhat.com> | 2008-02-11 17:16:04 -0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 17:40:47 +0200 |
| commit | 96597fd2be7070631ad0776cd8bced21415fd5e3 (patch) | |
| tree | f592ab1b01a1b10d032a44f0c2137693ec73df04 /arch/x86/kernel | |
| parent | 2785c8d052278228cc3806233c09295088f83d42 (diff) | |
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>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/vsmp_64.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c index fdf9fba6ba9..b93ed66c754 100644 --- a/arch/x86/kernel/vsmp_64.c +++ b/arch/x86/kernel/vsmp_64.c @@ -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) { |