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usr
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src
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linux-headers-6.8.0-36-generic
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arch
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hexagon
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include
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asm
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mem-layout.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Memory layout definitions for the Hexagon architecture * * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. */ #ifndef _ASM_HEXAGON_MEM_LAYOUT_H #define _ASM_HEXAGON_MEM_LAYOUT_H #include <linux/const.h> /* * Have to do this for ginormous numbers, else they get printed as * negative numbers, which the linker no likey when you try to * assign it to the location counter. */ #define PAGE_OFFSET _AC(0xc0000000, UL) /* * Compiling for a platform that needs a crazy physical offset * (like if the memory starts at 1GB and up) means we need * an actual PHYS_OFFSET. Should be set up in head.S. */ #ifdef CONFIG_HEXAGON_PHYS_OFFSET #ifndef __ASSEMBLY__ extern unsigned long __phys_offset; #endif #define PHYS_OFFSET __phys_offset #endif #ifndef PHYS_OFFSET #define PHYS_OFFSET 0 #endif #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET #define TASK_SIZE (PAGE_OFFSET) /* not sure how these are used yet */ #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX TASK_SIZE #ifndef __ASSEMBLY__ enum fixed_addresses { FIX_KMAP_BEGIN, FIX_KMAP_END, /* check for per-cpuism */ __end_of_fixed_addresses }; #define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */ extern int max_kernel_seg; /* * Start of vmalloc virtual address space for kernel; * supposed to be based on the amount of physical memory available */ #define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET)) /* Gap between physical ram and vmalloc space for guard purposes. */ #define VMALLOC_OFFSET PAGE_SIZE /* * Create the space between VMALLOC_START and FIXADDR_TOP backwards * from the ... "top". * * Permanent IO mappings will live at 0xfexx_xxxx * Hypervisor occupies the last 16MB page at 0xffxxxxxx */ #define FIXADDR_TOP 0xfe000000 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) /* * "permanent kernel mappings", defined as long-lasting mappings of * high-memory page frames into the kernel address space. */ #define LAST_PKMAP PTRS_PER_PTE #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) /* * To the "left" of the fixed map space is the kmap space * * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table * that looks like it's actually walked. * Need to check the alignment/shift usage; some archs use * PMD_MASK on this value */ #define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP) /* * 2 pages of guard gap between where vmalloc area ends * and pkmap_base begins. */ #define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2) #endif /* !__ASSEMBLY__ */ #endif /* _ASM_HEXAGON_MEM_LAYOUT_H */
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