File: /usr/src/linux/include/asm-mips64/sn/mapped_kernel.h

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_MAPPED_KERNEL
27     
28     #define MAPPED_ADDR_RO_TO_PHYS(x)	(x - CKSSEG)
29     #define MAPPED_ADDR_RW_TO_PHYS(x)	(x - CKSSEG - 16777216)
30     
31     #define MAPPED_KERN_RO_PHYSBASE(n) \
32     			(PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr)
33     #define MAPPED_KERN_RW_PHYSBASE(n) \
34     			(PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr)
35     
36     #define MAPPED_KERN_RO_TO_PHYS(x) \
37     				((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
38     				MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
39     #define MAPPED_KERN_RW_TO_PHYS(x) \
40     				((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
41     				MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
42     #define MAPPED_OFFSET			16777216
43     
44     #else /* CONFIG_MAPPED_KERNEL */
45     
46     #define MAPPED_KERN_RO_TO_PHYS(x)	(x - CKSEG0)
47     #define MAPPED_KERN_RW_TO_PHYS(x)	(x - CKSEG0)
48     #define MAPPED_OFFSET			0
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