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