| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Memory layout definitions for the Hexagon architecture |
| 4 | * |
| 5 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 */ |