1/*
2 * File created by Kanoj Sarcar 06/06/00.
3 * Copyright 2000 Silicon Graphics, Inc.
4 */
5#ifndef __ASM_SN_MAPPED_KERNEL_H
6#define __ASM_SN_MAPPED_KERNEL_H
7
8/*
9 * Note on how mapped kernels work: the text and data section is
10 * compiled at cksseg segment (LOADADDR = 0xc001c000), and the
11 * init/setup/data section gets a 16M virtual address bump in the
12 * ld.script file (so that tlblo0 and tlblo1 maps the sections).
13 * The vmlinux.64 section addresses are put in the xkseg range
14 * using the change-addresses makefile option. Use elfdump -of
15 * on IRIX to see where the sections go. The Origin loader loads
16 * the two sections contiguously in physical memory. The loader
17 * sets the entry point into kernel_entry using a xkphys address,
18 * but instead of using 0xa800000001160000, it uses the address
19 * 0xa800000000160000, which is where it physically loaded that
20 * code. So no jumps can be done before we have switched to using
21 * cksseg addresses.
22 */
23#include <asm/addrspace.h>
24
25#define REP_BASE	CAC_BASE
26
27#ifdef CONFIG_MAPPED_KERNEL
28
29#define MAPPED_ADDR_RO_TO_PHYS(x)	(x - REP_BASE)
30#define MAPPED_ADDR_RW_TO_PHYS(x)	(x - REP_BASE - 16777216)
31
32#define MAPPED_KERN_RO_PHYSBASE(n) \
33			(PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr)
34#define MAPPED_KERN_RW_PHYSBASE(n) \
35			(PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr)
36
37#define MAPPED_KERN_RO_TO_PHYS(x) \
38				((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
39				MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
40#define MAPPED_KERN_RW_TO_PHYS(x) \
41				((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
42				MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
43
44#else /* CONFIG_MAPPED_KERNEL */
45
46#define MAPPED_KERN_RO_TO_PHYS(x)	(x - REP_BASE)
47#define MAPPED_KERN_RW_TO_PHYS(x)	(x - REP_BASE)
48
49#endif /* CONFIG_MAPPED_KERNEL */
50
51#define MAPPED_KERN_RO_TO_K0(x)	PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
52#define MAPPED_KERN_RW_TO_K0(x)	PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))
53
54#endif /* __ASM_SN_MAPPED_KERNEL_H  */
55