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Subject[patch 18/26] x64, x2apic/intr-remap: x2apic ops for x2apic mode support
x2apic ops for x2apic mode support. This uses MSR interface and differs
slightly from the xapic register layout.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---

Index: tree-x86/arch/x86/kernel/apic_64.c
===================================================================
--- tree-x86.orig/arch/x86/kernel/apic_64.c 2008-07-10 09:52:14.000000000 -0700
+++ tree-x86/arch/x86/kernel/apic_64.c 2008-07-10 09:52:22.000000000 -0700
@@ -171,6 +171,41 @@

EXPORT_SYMBOL_GPL(apic_ops);

+static void x2apic_wait_icr_idle(void)
+{
+ /* no need to wait for icr idle in x2apic */
+ return;
+}
+
+static u32 safe_x2apic_wait_icr_idle(void)
+{
+ /* no need to wait for icr idle in x2apic */
+ return 0;
+}
+
+void x2apic_icr_write(u32 low, u32 id)
+{
+ wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
+}
+
+u64 x2apic_icr_read(void)
+{
+ unsigned long val;
+
+ rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
+ return val;
+}
+
+static struct apic_ops x2apic_ops = {
+ .read = native_apic_msr_read,
+ .write = native_apic_msr_write,
+ .write_atomic = native_apic_msr_write,
+ .icr_read = x2apic_icr_read,
+ .icr_write = x2apic_icr_write,
+ .wait_icr_idle = x2apic_wait_icr_idle,
+ .safe_wait_icr_idle = safe_x2apic_wait_icr_idle,
+};
+
/**
* enable_NMI_through_LVT0 - enable NMI through local vector table 0
*/
Index: tree-x86/include/asm-x86/apic.h
===================================================================
--- tree-x86.orig/include/asm-x86/apic.h 2008-07-10 09:52:14.000000000 -0700
+++ tree-x86/include/asm-x86/apic.h 2008-07-10 09:52:22.000000000 -0700
@@ -7,6 +7,8 @@
#include <asm/apicdef.h>
#include <asm/processor.h>
#include <asm/system.h>
+#include <asm/cpufeature.h>
+#include <asm/msr.h>

#define ARCH_APICTIMER_STOPS_ON_C3 1

@@ -73,6 +75,26 @@
return *((volatile u32 *)(APIC_BASE + reg));
}

+static inline void native_apic_msr_write(u32 reg, u32 v)
+{
+ if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
+ reg == APIC_LVR)
+ return;
+
+ wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
+}
+
+static inline u32 native_apic_msr_read(u32 reg)
+{
+ u32 low, high;
+
+ if (reg == APIC_DFR)
+ return -1;
+
+ rdmsr(APIC_BASE_MSR + (reg >> 4), low, high);
+ return low;
+}
+
#ifdef CONFIG_X86_32
extern void apic_wait_icr_idle(void);
extern u32 safe_apic_wait_icr_idle(void);
Index: tree-x86/include/asm-x86/apicdef.h
===================================================================
--- tree-x86.orig/include/asm-x86/apicdef.h 2008-07-10 09:51:45.000000000 -0700
+++ tree-x86/include/asm-x86/apicdef.h 2008-07-10 09:52:22.000000000 -0700
@@ -105,6 +105,7 @@
#define APIC_TMICT 0x380
#define APIC_TMCCT 0x390
#define APIC_TDCR 0x3E0
+#define APIC_SELF_IPI 0x3F0
#define APIC_TDR_DIV_TMBASE (1 << 2)
#define APIC_TDR_DIV_1 0xB
#define APIC_TDR_DIV_2 0x0
@@ -128,6 +129,8 @@
#define APIC_EILVT3 0x530

#define APIC_BASE (fix_to_virt(FIX_APIC_BASE))
+#define APIC_BASE_MSR 0x800
+#define X2APIC_ENABLE (1UL << 10)

#ifdef CONFIG_X86_32
# define MAX_IO_APICS 64
--



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