Linux kernel mirror (for testing)
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linux
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 <linux/config.h>
24#include <asm/addrspace.h>
25
26#ifdef CONFIG_BUILD_ELF64
27#define REP_BASE CAC_BASE
28#else
29#define REP_BASE CKSEG0
30#endif
31
32#ifdef CONFIG_MAPPED_KERNEL
33
34#define MAPPED_ADDR_RO_TO_PHYS(x) (x - REP_BASE)
35#define MAPPED_ADDR_RW_TO_PHYS(x) (x - REP_BASE - 16777216)
36
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)
41
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()))
48
49#else /* CONFIG_MAPPED_KERNEL */
50
51#define MAPPED_KERN_RO_TO_PHYS(x) (x - REP_BASE)
52#define MAPPED_KERN_RW_TO_PHYS(x) (x - REP_BASE)
53
54#endif /* CONFIG_MAPPED_KERNEL */
55
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))
58
59#endif /* __ASM_SN_MAPPED_KERNEL_H */