65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_FIXMAP_H
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#define _ASM_FIXMAP_H
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/*
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* This file defines the locations of the fixed mappings on parisc.
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*
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* All of the values in this file are machine virtual addresses.
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*
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* All of the values in this file must be <4GB (because of assembly
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* loading restrictions). If you place this region anywhere above
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* __PAGE_OFFSET, you must adjust the memory map accordingly
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*/
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/*
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* The tmpalias region is used in kernel space to copy/clear/flush data
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* from pages congruently mapped with user space. It is comprised of
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* a pair regions. The size of these regions is determined by the largest
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* cache aliasing boundary for machines that support equivalent aliasing.
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*
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* The c3750 with PA8700 processor returns an alias value of 11. This
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* indicates that it has an alias boundary of 4 MB. It also supports
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* non-equivalent aliasing without a performance penalty.
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*
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* Machines with PA8800/PA8900 processors return an alias value of 0.
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* This indicates the alias boundary is unknown and may be larger than
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* 16 MB. Non-equivalent aliasing is not supported.
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*
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* Here we assume the maximum alias boundary is 4 MB.
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*/
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#define TMPALIAS_SIZE_BITS 22 /* 4 MB */
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#define TMPALIAS_MAP_START ((__PAGE_OFFSET) - (2 << TMPALIAS_SIZE_BITS))
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#define FIXMAP_SIZE (FIX_BITMAP_COUNT << PAGE_SHIFT)
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#define FIXMAP_START (TMPALIAS_MAP_START - FIXMAP_SIZE)
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/* This is the kernel area for all maps (vmalloc, dma etc.) most
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* usually, it extends up to TMPALIAS_MAP_START. Virtual addresses
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* 0..GATEWAY_PAGE_SIZE are reserved for the gateway page */
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#define KERNEL_MAP_START (GATEWAY_PAGE_SIZE)
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#define KERNEL_MAP_END (FIXMAP_START)
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#ifndef __ASSEMBLY__
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enum fixed_addresses {
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/* Support writing RO kernel text via kprobes, jump labels, etc. */
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FIX_TEXT_POKE0,
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FIX_TEXT_KEXEC,
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FIX_BITMAP_COUNT
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};
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extern void *parisc_vmalloc_start;
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#define PCXL_DMA_MAP_SIZE (8*1024*1024)
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#define VMALLOC_START ((unsigned long)parisc_vmalloc_start)
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#define VMALLOC_END (KERNEL_MAP_END)
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#define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
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void set_fixmap(enum fixed_addresses idx, phys_addr_t phys);
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void clear_fixmap(enum fixed_addresses idx);
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#endif /*__ASSEMBLY__*/
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#endif /*_ASM_FIXMAP_H*/
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