Linux v2.6.15-rc6
[pohmelfs.git] / include / asm-mips / sn / mapped_kernel.h
blob3a17846df8497d319ed7112fdff2013f4309e989
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
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.
23 #include <linux/config.h>
24 #include <asm/addrspace.h>
26 #ifdef CONFIG_BUILD_ELF64
27 #define REP_BASE CAC_BASE
28 #else
29 #define REP_BASE CKSEG0
30 #endif
32 #ifdef CONFIG_MAPPED_KERNEL
34 #define MAPPED_ADDR_RO_TO_PHYS(x) (x - REP_BASE)
35 #define MAPPED_ADDR_RW_TO_PHYS(x) (x - REP_BASE - 16777216)
37 #define MAPPED_KERN_RO_PHYSBASE(n) \
38 (PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr)
39 #define MAPPED_KERN_RW_PHYSBASE(n) \
40 (PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr)
42 #define MAPPED_KERN_RO_TO_PHYS(x) \
43 ((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
44 MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
45 #define MAPPED_KERN_RW_TO_PHYS(x) \
46 ((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
47 MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
49 #else /* CONFIG_MAPPED_KERNEL */
51 #define MAPPED_KERN_RO_TO_PHYS(x) (x - REP_BASE)
52 #define MAPPED_KERN_RW_TO_PHYS(x) (x - REP_BASE)
54 #endif /* CONFIG_MAPPED_KERNEL */
56 #define MAPPED_KERN_RO_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
57 #define MAPPED_KERN_RW_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))
59 #endif /* __ASM_SN_MAPPED_KERNEL_H */