release/src-rt-6.x/linux/linux-2.6/include/asm-mips/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 #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  */