From 79f12614a6537cc3ac9ca4d1ea26f6e4f4a34aee Mon Sep 17 00:00:00 2001
From: Ravikiran G Thirumalai
Date: Wed, 11 Jan 2006 22:46:18 +0100
Subject: [PATCH] x86_64: Inclusion of ScaleMP vSMP architecture patches -
 vsmp_arch

Introduce vSMP arch to the kernel.

This patch:
1. Adds CONFIG_X86_VSMP
2. Adds machine specific macros for local_irq_disabled, local_irq_enabled
   and irqs_disabled
3. Writes to the vSMP CTL device to indicate kernel compiled with CONFIG_VSMP

Signed-off-by: Ravikiran Thirumalai <kiran@scalemp.com>
Signed-off-by: Shai Fultheim <shai@scalemp.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/x86_64/kernel/vsmp.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 arch/x86_64/kernel/vsmp.c

(limited to 'arch/x86_64/kernel/vsmp.c')

diff --git a/arch/x86_64/kernel/vsmp.c b/arch/x86_64/kernel/vsmp.c
new file mode 100644
index 000000000000..92f70c74965f
--- /dev/null
+++ b/arch/x86_64/kernel/vsmp.c
@@ -0,0 +1,45 @@
+/*
+ * vSMPowered(tm) systems specific initialization
+ * Copyright (C) 2005 ScaleMP Inc.
+ *
+ * Use of this code is subject to the terms and conditions of the
+ * GNU general public license version 2. See "COPYING" or
+ * http://www.gnu.org/licenses/gpl.html
+ *
+ * Ravikiran Thirumalai <kiran@scalemp.com>,
+ * Shai Fultheim <shai@scalemp.com>
+ */
+
+#include <linux/init.h>
+#include <linux/pci_ids.h>
+#include <linux/pci_regs.h>
+#include <asm/pci-direct.h>
+
+static int __init vsmp_init(void)
+{
+	void *address;
+	unsigned int cap, ctl;
+
+	/* Check if we are running on a ScaleMP vSMP box */
+	if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) != PCI_VENDOR_ID_SCALEMP) ||
+	    (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) != PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
+		return 0;
+
+	/* set vSMP magic bits to indicate vSMP capable kernel */
+	address = ioremap(read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0), 8);
+	cap = readl(address);
+	ctl = readl(address + 4);
+	printk("vSMP CTL: capabilities:0x%08x  control:0x%08x\n", cap, ctl);
+	if (cap & ctl & (1 << 4)) {
+		/* Turn on vSMP IRQ fastpath handling (see system.h) */
+		ctl &= ~(1 << 4);
+		writel(ctl, address + 4);
+		ctl = readl(address + 4);
+		printk("vSMP CTL: control set to:0x%08x\n", ctl);
+	}
+
+	iounmap(address);
+	return 0;
+}
+
+core_initcall(vsmp_init);
-- 
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