1 files changed, 55 insertions, 0 deletions
diff --git a/arch/mips/include/asm/sn/mapped_kernel.h b/arch/mips/include/asm/sn/mapped_kernel.h
new file mode 100644
index 000000000..3f1049807
--- /dev/null
+++ b/arch/mips/include/asm/sn/mapped_kernel.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * File created by Kanoj Sarcar 06/06/00.
+ * Copyright 2000 Silicon Graphics, Inc.
+ */
+#ifndef __ASM_SN_MAPPED_KERNEL_H
+#define __ASM_SN_MAPPED_KERNEL_H
+
+#include <linux/mmzone.h>
+
+/*
+ * Note on how mapped kernels work: the text and data section is
+ * compiled at cksseg segment (LOADADDR = 0xc001c000), and the
+ * init/setup/data section gets a 16M virtual address bump in the
+ * ld.script file (so that tlblo0 and tlblo1 maps the sections).
+ * The vmlinux.64 section addresses are put in the xkseg range
+ * using the change-addresses makefile option. Use elfdump -of
+ * on IRIX to see where the sections go. The Origin loader loads
+ * the two sections contiguously in physical memory. The loader
+ * sets the entry point into kernel_entry using a xkphys address,
+ * but instead of using 0xa800000001160000, it uses the address
+ * 0xa800000000160000, which is where it physically loaded that
+ * code. So no jumps can be done before we have switched to using
+ * cksseg addresses.
+ */
+#include <asm/addrspace.h>
+
+#define REP_BASE	CAC_BASE
+
+#ifdef CONFIG_MAPPED_KERNEL
+
+#define MAPPED_ADDR_RO_TO_PHYS(x)	(x - REP_BASE)
+#define MAPPED_ADDR_RW_TO_PHYS(x)	(x - REP_BASE - 16777216)
+
+#define MAPPED_KERN_RO_PHYSBASE(n) (hub_data(n)->kern_vars.kv_ro_baseaddr)
+#define MAPPED_KERN_RW_PHYSBASE(n) (hub_data(n)->kern_vars.kv_rw_baseaddr)
+
+#define MAPPED_KERN_RO_TO_PHYS(x) \
+				((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
+				MAPPED_KERN_RO_PHYSBASE(get_nasid()))
+#define MAPPED_KERN_RW_TO_PHYS(x) \
+				((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
+				MAPPED_KERN_RW_PHYSBASE(get_nasid()))
+
+#else /* CONFIG_MAPPED_KERNEL */
+
+#define MAPPED_KERN_RO_TO_PHYS(x)	(x - REP_BASE)
+#define MAPPED_KERN_RW_TO_PHYS(x)	(x - REP_BASE)
+
+#endif /* CONFIG_MAPPED_KERNEL */
+
+#define MAPPED_KERN_RO_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
+#define MAPPED_KERN_RW_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))
+
+#endif /* __ASM_SN_MAPPED_KERNEL_H  */