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c64c782e58
Remove the hardcoded bit definitions in the tmpalias assembly code. This makes it easy to change the size of the tmpalias region. The alignment of the tmpalias region is reduced from 16 MB to 8 MB. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* 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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