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