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 #include <linux/mmzone.h>
9 
10 /*
11  * Note on how mapped kernels work: the text and data section is
12  * compiled at cksseg segment (LOADADDR = 0xc001c000), and the
13  * init/setup/data section gets a 16M virtual address bump in the
14  * ld.script file (so that tlblo0 and tlblo1 maps the sections).
15  * The vmlinux.64 section addresses are put in the xkseg range
16  * using the change-addresses makefile option. Use elfdump -of
17  * on IRIX to see where the sections go. The Origin loader loads
18  * the two sections contiguously in physical memory. The loader
19  * sets the entry point into kernel_entry using a xkphys address,
20  * but instead of using 0xa800000001160000, it uses the address
21  * 0xa800000000160000, which is where it physically loaded that
22  * code. So no jumps can be done before we have switched to using
23  * cksseg addresses.
24  */
25 #include <asm/addrspace.h>
26 
27 #define REP_BASE	CAC_BASE
28 
29 #ifdef CONFIG_MAPPED_KERNEL
30 
31 #define MAPPED_ADDR_RO_TO_PHYS(x)	(x - REP_BASE)
32 #define MAPPED_ADDR_RW_TO_PHYS(x)	(x - REP_BASE - 16777216)
33 
34 #define MAPPED_KERN_RO_PHYSBASE(n) (hub_data(n)->kern_vars.kv_ro_baseaddr)
35 #define MAPPED_KERN_RW_PHYSBASE(n) (hub_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