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Linux/arch/hexagon/include/asm/mem-layout.h

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  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__
 29 extern 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__
 48 enum 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 */
 55 extern 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 */
108 

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