arch/mips/include/asm/sn/mapped_kernel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * File created by Kanoj Sarcar 06/06/00.
   4  * Copyright 2000 Silicon Graphics, Inc.
   5  */
   6 #ifndef __ASM_SN_MAPPED_KERNEL_H
   7 #define __ASM_SN_MAPPED_KERNEL_H
   8
   9 #include <linux/mmzone.h>
  10
  11 /*
  12  * Note on how mapped kernels work: the text and data section is
  13  * compiled at cksseg segment (LOADADDR = 0xc001c000), and the
  14  * init/setup/data section gets a 16M virtual address bump in the
  15  * ld.script file (so that tlblo0 and tlblo1 maps the sections).
  16  * The vmlinux.64 section addresses are put in the xkseg range
  17  * using the change-addresses makefile option. Use elfdump -of
  18  * on IRIX to see where the sections go. The Origin loader loads
  19  * the two sections contiguously in physical memory. The loader
  20  * sets the entry point into kernel_entry using a xkphys address,
  21  * but instead of using 0xa800000001160000, it uses the address
  22  * 0xa800000000160000, which is where it physically loaded that
  23  * code. So no jumps can be done before we have switched to using
  24  * cksseg addresses.
  25  */
  26 #include <asm/addrspace.h>
  27
  28 #define REP_BASE        CAC_BASE
  29
  30 #ifdef CONFIG_MAPPED_KERNEL
  31
  32 #define MAPPED_ADDR_RO_TO_PHYS(x)       (x - REP_BASE)
  33 #define MAPPED_ADDR_RW_TO_PHYS(x)       (x - REP_BASE - 16777216)
  34
  35 #define MAPPED_KERN_RO_PHYSBASE(n) (hub_data(n)->kern_vars.kv_ro_baseaddr)
  36 #define MAPPED_KERN_RW_PHYSBASE(n) (hub_data(n)->kern_vars.kv_rw_baseaddr)
  37
  38 #define MAPPED_KERN_RO_TO_PHYS(x) \
  39                                 ((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
  40                                 MAPPED_KERN_RO_PHYSBASE(get_nasid()))
  41 #define MAPPED_KERN_RW_TO_PHYS(x) \
  42                                 ((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
  43                                 MAPPED_KERN_RW_PHYSBASE(get_nasid()))
  44
  45 #else /* CONFIG_MAPPED_KERNEL */
  46
  47 #define MAPPED_KERN_RO_TO_PHYS(x)       (x - REP_BASE)
  48 #define MAPPED_KERN_RW_TO_PHYS(x)       (x - REP_BASE)
  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  */