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65 lines
1.6 KiB
65 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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#ifndef _ASM_HIGHMEM_H |
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#define _ASM_HIGHMEM_H |
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#include <asm/proc-fns.h> |
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#include <asm/fixmap.h> |
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/* |
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* Right now we initialize only a single pte table. It can be extended |
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* easily, subsequent pte tables have to be allocated in one physical |
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* chunk of RAM. |
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*/ |
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/* |
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* Ordering is (from lower to higher memory addresses): |
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* |
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* high_memory |
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* Persistent kmap area |
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* PKMAP_BASE |
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* fixed_addresses |
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* FIXADDR_START |
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* FIXADDR_TOP |
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* Vmalloc area |
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* VMALLOC_START |
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* VMALLOC_END |
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*/ |
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#define PKMAP_BASE ((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK)) |
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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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static inline void flush_cache_kmaps(void) |
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{ |
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cpu_dcache_wbinval_all(); |
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} |
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/* declarations for highmem.c */ |
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extern unsigned long highstart_pfn, highend_pfn; |
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extern pte_t *pkmap_page_table; |
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extern void kmap_init(void); |
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/* |
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* FIXME: The below looks broken vs. a kmap_atomic() in task context which |
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* is interupted and another kmap_atomic() happens in interrupt context. |
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* But what do I know about nds32. -- tglx |
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*/ |
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#define arch_kmap_local_post_map(vaddr, pteval) \ |
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do { \ |
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__nds32__tlbop_inv(vaddr); \ |
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__nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); \ |
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__nds32__tlbop_rwr(pteval); \ |
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__nds32__isb(); \ |
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} while (0) |
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#define arch_kmap_local_pre_unmap(vaddr) \ |
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do { \ |
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__nds32__tlbop_inv(vaddr); \ |
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__nds32__isb(); \ |
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} while (0) |
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#endif
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