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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mem-layout.h (2865B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Memory layout definitions for the Hexagon architecture
      4 *
      5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
      6 */
      7
      8#ifndef _ASM_HEXAGON_MEM_LAYOUT_H
      9#define _ASM_HEXAGON_MEM_LAYOUT_H
     10
     11#include <linux/const.h>
     12
     13/*
     14 * Have to do this for ginormous numbers, else they get printed as
     15 * negative numbers, which the linker no likey when you try to
     16 * assign it to the location counter.
     17 */
     18
     19#define PAGE_OFFSET			_AC(0xc0000000, UL)
     20
     21/*
     22 * Compiling for a platform that needs a crazy physical offset
     23 * (like if the memory starts at 1GB and up) means we need
     24 * an actual PHYS_OFFSET.  Should be set up in head.S.
     25 */
     26
     27#ifdef CONFIG_HEXAGON_PHYS_OFFSET
     28#ifndef __ASSEMBLY__
     29extern unsigned long	__phys_offset;
     30#endif
     31#define PHYS_OFFSET	__phys_offset
     32#endif
     33
     34#ifndef PHYS_OFFSET
     35#define PHYS_OFFSET	0
     36#endif
     37
     38#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
     39#define ARCH_PFN_OFFSET	PHYS_PFN_OFFSET
     40
     41#define TASK_SIZE			(PAGE_OFFSET)
     42
     43/*  not sure how these are used yet  */
     44#define STACK_TOP			TASK_SIZE
     45#define STACK_TOP_MAX			TASK_SIZE
     46
     47#ifndef __ASSEMBLY__
     48enum fixed_addresses {
     49	FIX_KMAP_BEGIN,
     50	FIX_KMAP_END,  /*  check for per-cpuism  */
     51	__end_of_fixed_addresses
     52};
     53
     54#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT)   /* L1 shift is 22 bits */
     55extern int max_kernel_seg;
     56
     57/*
     58 * Start of vmalloc virtual address space for kernel;
     59 * supposed to be based on the amount of physical memory available
     60 */
     61
     62#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET))
     63
     64/* Gap between physical ram and vmalloc space for guard purposes. */
     65#define VMALLOC_OFFSET PAGE_SIZE
     66
     67/*
     68 * Create the space between VMALLOC_START and FIXADDR_TOP backwards
     69 * from the ... "top".
     70 *
     71 * Permanent IO mappings will live at 0xfexx_xxxx
     72 * Hypervisor occupies the last 16MB page at 0xffxxxxxx
     73 */
     74
     75#define FIXADDR_TOP     0xfe000000
     76#define FIXADDR_SIZE    (__end_of_fixed_addresses << PAGE_SHIFT)
     77#define FIXADDR_START   (FIXADDR_TOP - FIXADDR_SIZE)
     78
     79/*
     80 * "permanent kernel mappings", defined as long-lasting mappings of
     81 * high-memory page frames into the kernel address space.
     82 */
     83
     84#define LAST_PKMAP	PTRS_PER_PTE
     85#define LAST_PKMAP_MASK	(LAST_PKMAP - 1)
     86#define PKMAP_NR(virt)	((virt - PKMAP_BASE) >> PAGE_SHIFT)
     87#define PKMAP_ADDR(nr)	(PKMAP_BASE + ((nr) << PAGE_SHIFT))
     88
     89/*
     90 * To the "left" of the fixed map space is the kmap space
     91 *
     92 * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table
     93 * that looks like it's actually walked.
     94 * Need to check the alignment/shift usage; some archs use
     95 * PMD_MASK on this value
     96 */
     97#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP)
     98
     99/*
    100 * 2 pages of guard gap between where vmalloc area ends
    101 * and pkmap_base begins.
    102 */
    103#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2)
    104#endif /*  !__ASSEMBLY__  */
    105
    106
    107#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */