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authorRavikiran G Thirumalai <kiran@scalex86.org>2006-01-11 22:46:18 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:05:01 -0800
commit79f12614a6537cc3ac9ca4d1ea26f6e4f4a34aee (patch)
tree25167c8862ad7733c7e044b0aad67e4291a0681b /arch/x86_64/kernel/vsmp.c
parent5fd63b308569060ffa40af52ed122d9734111bff (diff)
[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>
Diffstat (limited to 'arch/x86_64/kernel/vsmp.c')
-rw-r--r--arch/x86_64/kernel/vsmp.c45
1 files changed, 45 insertions, 0 deletions
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);