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107 lines
2.8 KiB
107 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Memory layout definitions for the Hexagon architecture |
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* |
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
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*/ |
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#ifndef _ASM_HEXAGON_MEM_LAYOUT_H |
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#define _ASM_HEXAGON_MEM_LAYOUT_H |
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#include <linux/const.h> |
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/* |
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* Have to do this for ginormous numbers, else they get printed as |
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* negative numbers, which the linker no likey when you try to |
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* assign it to the location counter. |
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*/ |
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#define PAGE_OFFSET _AC(0xc0000000, UL) |
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/* |
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* Compiling for a platform that needs a crazy physical offset |
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* (like if the memory starts at 1GB and up) means we need |
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* an actual PHYS_OFFSET. Should be set up in head.S. |
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*/ |
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#ifdef CONFIG_HEXAGON_PHYS_OFFSET |
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#ifndef __ASSEMBLY__ |
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extern unsigned long __phys_offset; |
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#endif |
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#define PHYS_OFFSET __phys_offset |
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#endif |
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#ifndef PHYS_OFFSET |
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#define PHYS_OFFSET 0 |
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#endif |
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) |
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#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
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#define TASK_SIZE (PAGE_OFFSET) |
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/* not sure how these are used yet */ |
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#define STACK_TOP TASK_SIZE |
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#define STACK_TOP_MAX TASK_SIZE |
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#ifndef __ASSEMBLY__ |
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enum fixed_addresses { |
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FIX_KMAP_BEGIN, |
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FIX_KMAP_END, /* check for per-cpuism */ |
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__end_of_fixed_addresses |
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}; |
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#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */ |
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extern int max_kernel_seg; |
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/* |
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* Start of vmalloc virtual address space for kernel; |
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* supposed to be based on the amount of physical memory available |
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*/ |
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#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET)) |
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/* Gap between physical ram and vmalloc space for guard purposes. */ |
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#define VMALLOC_OFFSET PAGE_SIZE |
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/* |
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* Create the space between VMALLOC_START and FIXADDR_TOP backwards |
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* from the ... "top". |
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* |
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* Permanent IO mappings will live at 0xfexx_xxxx |
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* Hypervisor occupies the last 16MB page at 0xffxxxxxx |
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*/ |
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#define FIXADDR_TOP 0xfe000000 |
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#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
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/* |
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* "permanent kernel mappings", defined as long-lasting mappings of |
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* high-memory page frames into the kernel address space. |
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*/ |
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#define LAST_PKMAP PTRS_PER_PTE |
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1) |
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#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) |
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
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/* |
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* To the "left" of the fixed map space is the kmap space |
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* |
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* "Permanent Kernel Mappings"; fancy (or less fancy) PTE table |
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* that looks like it's actually walked. |
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* Need to check the alignment/shift usage; some archs use |
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* PMD_MASK on this value |
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*/ |
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#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP) |
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/* |
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* 2 pages of guard gap between where vmalloc area ends |
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* and pkmap_base begins. |
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*/ |
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#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2) |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */
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