diff --git a/include/asm-mips/mach-ip27/cpu-feature-overrides.h b/include/asm-mips/mach-ip27/cpu-feature-overrides.h
new file mode 100644
index 0000000..fe96d73
--- /dev/null
+++ b/include/asm-mips/mach-ip27/cpu-feature-overrides.h
@@ -0,0 +1,39 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003 Ralf Baechle
+ */
+#ifndef __ASM_MACH_IP27_CPU_FEATURE_OVERRIDES_H
+#define __ASM_MACH_IP27_CPU_FEATURE_OVERRIDES_H
+
+/*
+ * IP27 only comes with R10000 family processors all using the same config
+ */
+#define cpu_has_watch		1
+#define cpu_has_mips16		0
+#define cpu_has_divec		0
+#define cpu_has_vce		0
+#define cpu_has_cache_cdex_p	0
+#define cpu_has_cache_cdex_s	0
+#define cpu_has_prefetch	1
+#define cpu_has_mcheck		0
+#define cpu_has_ejtag		0
+
+#define cpu_has_llsc		1
+#define cpu_has_vtag_icache	0
+#define cpu_has_dc_aliases	0
+#define cpu_has_ic_fills_f_dc	0
+#define cpu_icache_snoops_remote_store	1
+
+#define cpu_has_nofpuex		0
+#define cpu_has_64bits		1
+
+#define cpu_has_subset_pcaches	1
+
+#define cpu_dcache_line_size()	32
+#define cpu_icache_line_size()	64
+#define cpu_scache_line_size()	128
+
+#endif /* __ASM_MACH_IP27_CPU_FEATURE_OVERRIDES_H */
diff --git a/include/asm-mips/mach-ip27/irq.h b/include/asm-mips/mach-ip27/irq.h
new file mode 100644
index 0000000..806213c
--- /dev/null
+++ b/include/asm-mips/mach-ip27/irq.h
@@ -0,0 +1,22 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999, 2000, 01, 02, 03 by Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2001 Kanoj Sarcar
+ */
+#ifndef __ASM_MACH_IP27_IRQ_H
+#define __ASM_MACH_IP27_IRQ_H
+
+#include <asm/sn/arch.h>
+
+/*
+ * A hardwired interrupt number is completly stupid for this system - a
+ * large configuration might have thousands if not tenthousands of
+ * interrupts.
+ */
+#define NR_IRQS 256
+
+#endif /* __ASM_MACH_IP27_IRQ_H */
diff --git a/include/asm-mips/mach-ip27/mangle-port.h b/include/asm-mips/mach-ip27/mangle-port.h
new file mode 100644
index 0000000..f76c448
--- /dev/null
+++ b/include/asm-mips/mach-ip27/mangle-port.h
@@ -0,0 +1,16 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003, 2004 Ralf Baechle
+ */
+#ifndef __ASM_MACH_IP27_MANGLE_PORT_H
+#define __ASM_MACH_IP27_MANGLE_PORT_H
+
+#define __swizzle_addr_b(port)	(port)
+#define __swizzle_addr_w(port)	((port) ^ 2)
+#define __swizzle_addr_l(port)	(port)
+#define __swizzle_addr_q(port)	(port)
+
+#endif /* __ASM_MACH_IP27_MANGLE_PORT_H */
diff --git a/include/asm-mips/mach-ip27/mmzone.h b/include/asm-mips/mach-ip27/mmzone.h
new file mode 100644
index 0000000..d3f5663
--- /dev/null
+++ b/include/asm-mips/mach-ip27/mmzone.h
@@ -0,0 +1,36 @@
+#ifndef _ASM_MACH_MMZONE_H
+#define _ASM_MACH_MMZONE_H
+
+#include <asm/sn/addrs.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/hub.h>
+
+#define pa_to_nid(addr)		NASID_TO_COMPACT_NODEID(NASID_GET(addr))
+
+#define LEVELS_PER_SLICE        128
+
+struct slice_data {
+	unsigned long irq_alloc_mask[2];
+	unsigned long irq_enable_mask[2];
+	int level_to_irq[LEVELS_PER_SLICE];
+};
+
+struct hub_data {
+	kern_vars_t	kern_vars;
+	DECLARE_BITMAP(h_bigwin_used, HUB_NUM_BIG_WINDOW);
+	cpumask_t	h_cpus;
+	unsigned long slice_map;
+	struct slice_data slice[2];
+};
+
+struct node_data {
+	struct pglist_data pglist;
+	struct hub_data hub;
+};
+
+extern struct node_data *__node_data[];
+
+#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
+#define hub_data(n)		(&__node_data[(n)]->hub)
+
+#endif /* _ASM_MACH_MMZONE_H */
diff --git a/include/asm-mips/mach-ip27/spaces.h b/include/asm-mips/mach-ip27/spaces.h
new file mode 100644
index 0000000..e3b3fe3
--- /dev/null
+++ b/include/asm-mips/mach-ip27/spaces.h
@@ -0,0 +1,34 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 99 Ralf Baechle
+ * Copyright (C) 2000, 2002  Maciej W. Rozycki
+ * Copyright (C) 1990, 1999 by Silicon Graphics, Inc.
+ */
+#ifndef _ASM_MACH_IP27_SPACES_H
+#define _ASM_MACH_IP27_SPACES_H
+
+/*
+ * IP27 uses the R10000's uncached attribute feature.  Attribute 3 selects
+ * uncached memory addressing.
+ */
+#define CAC_BASE		0xa800000000000000
+
+#define HSPEC_BASE		0x9000000000000000
+#define IO_BASE			0x9200000000000000
+#define MSPEC_BASE		0x9400000000000000
+#define UNCAC_BASE		0x9600000000000000
+
+#define TO_PHYS(x)		(             ((x) & TO_PHYS_MASK))
+#define TO_CAC(x)		(CAC_BASE   | ((x) & TO_PHYS_MASK))
+#define TO_UNCAC(x)		(UNCAC_BASE | ((x) & TO_PHYS_MASK))
+#define TO_MSPEC(x)		(MSPEC_BASE | ((x) & TO_PHYS_MASK))
+#define TO_HSPEC(x)		(HSPEC_BASE | ((x) & TO_PHYS_MASK))
+
+#define PAGE_OFFSET		CAC_BASE
+
+#define HIGHMEM_START		(~0UL)
+
+#endif /* _ASM_MACH_IP27_SPACES_H */
diff --git a/include/asm-mips/mach-ip27/topology.h b/include/asm-mips/mach-ip27/topology.h
new file mode 100644
index 0000000..a70a812
--- /dev/null
+++ b/include/asm-mips/mach-ip27/topology.h
@@ -0,0 +1,38 @@
+#ifndef _ASM_MACH_TOPOLOGY_H
+#define _ASM_MACH_TOPOLOGY_H	1
+
+#include <asm/sn/arch.h>
+#include <asm/sn/hub.h>
+#include <asm/mmzone.h>
+
+#define cpu_to_node(cpu)	(cpu_data[(cpu)].p_nodeid)
+#define parent_node(node)	(node)
+#define node_to_cpumask(node)	(hub_data(node)->h_cpus)
+#define node_to_first_cpu(node)	(first_cpu(node_to_cpumask(node)))
+#define pcibus_to_cpumask(bus)	(cpu_online_map)
+
+extern unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
+
+#define node_distance(from, to)	(__node_distances[(from)][(to)])
+
+/* sched_domains SD_NODE_INIT for SGI IP27 machines */
+#define SD_NODE_INIT (struct sched_domain) {		\
+	.span			= CPU_MASK_NONE,	\
+	.parent			= NULL,			\
+	.groups			= NULL,			\
+	.min_interval		= 8,			\
+	.max_interval		= 32,			\
+	.busy_factor		= 32,			\
+	.imbalance_pct		= 125,			\
+	.cache_hot_time		= (10*1000),		\
+	.cache_nice_tries	= 1,			\
+	.per_cpu_gain		= 100,			\
+	.flags			= SD_LOAD_BALANCE	\
+				| SD_BALANCE_EXEC	\
+				| SD_WAKE_BALANCE,	\
+	.last_balance		= jiffies,		\
+	.balance_interval	= 1,			\
+	.nr_balance_failed	= 0,			\
+}
+
+#endif /* _ASM_MACH_TOPOLOGY_H */