1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * File created by Kanoj Sarcar 06/06/00.
4  * Copyright 2000 Silicon Graphics, Inc.
5  */
6 #ifndef __ASM_SN_MAPPED_KERNEL_H
7 #define __ASM_SN_MAPPED_KERNEL_H
8 
9 #include <linux/mmzone.h>
10 
11 /*
12  * Note on how mapped kernels work: the text and data section is
13  * compiled at cksseg segment (LOADADDR = 0xc001c000), and the
14  * init/setup/data section gets a 16M virtual address bump in the
15  * ld.script file (so that tlblo0 and tlblo1 maps the sections).
16  * The vmlinux.64 section addresses are put in the xkseg range
17  * using the change-addresses makefile option. Use elfdump -of
18  * on IRIX to see where the sections go. The Origin loader loads
19  * the two sections contiguously in physical memory. The loader
20  * sets the entry point into kernel_entry using a xkphys address,
21  * but instead of using 0xa800000001160000, it uses the address
22  * 0xa800000000160000, which is where it physically loaded that
23  * code. So no jumps can be done before we have switched to using
24  * cksseg addresses.
25  */
26 #include <asm/addrspace.h>
27 
28 #define REP_BASE	CAC_BASE
29 
30 #ifdef CONFIG_MAPPED_KERNEL
31 
32 #define MAPPED_ADDR_RO_TO_PHYS(x)	(x - REP_BASE)
33 #define MAPPED_ADDR_RW_TO_PHYS(x)	(x - REP_BASE - 16777216)
34 
35 #define MAPPED_KERN_RO_PHYSBASE(n) (hub_data(n)->kern_vars.kv_ro_baseaddr)
36 #define MAPPED_KERN_RW_PHYSBASE(n) (hub_data(n)->kern_vars.kv_rw_baseaddr)
37 
38 #define MAPPED_KERN_RO_TO_PHYS(x) \
39 				((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
40 				MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
41 #define MAPPED_KERN_RW_TO_PHYS(x) \
42 				((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
43 				MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
44 
45 #else /* CONFIG_MAPPED_KERNEL */
46 
47 #define MAPPED_KERN_RO_TO_PHYS(x)	(x - REP_BASE)
48 #define MAPPED_KERN_RW_TO_PHYS(x)	(x - REP_BASE)
49 
50 #endif /* CONFIG_MAPPED_KERNEL */
51 
52 #define MAPPED_KERN_RO_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
53 #define MAPPED_KERN_RW_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))
54 
55 #endif /* __ASM_SN_MAPPED_KERNEL_H  */
56