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 /*
   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  */