120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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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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