cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mapped_kernel.h (1975B)

      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  */