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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d39af90265
MMUv3 is able to support low memory bigger than 128MB. Implement 256MB and 512MB KSEG layouts: - add Kconfig selector for KSEG layout; - add KSEG base address, size and alignment definitions to arch/xtensa/include/asm/kmem_layout.h; - use new definitions in TLB initialization; - add build time memory map consistency checks. See Documentation/xtensa/mmu.txt for the details of new memory layouts. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*
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* include/asm-xtensa/highmem.h
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of
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* this archive for more details.
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*
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* Copyright (C) 2003 - 2005 Tensilica Inc.
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* Copyright (C) 2014 Cadence Design Systems Inc.
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*/
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#ifndef _XTENSA_HIGHMEM_H
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#define _XTENSA_HIGHMEM_H
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#include <linux/wait.h>
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#include <asm/cacheflush.h>
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#include <asm/fixmap.h>
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#include <asm/kmap_types.h>
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#include <asm/pgtable.h>
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#define PKMAP_BASE ((FIXADDR_START - \
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(LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
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#define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS)
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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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#define kmap_prot PAGE_KERNEL_EXEC
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#if DCACHE_WAY_SIZE > PAGE_SIZE
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#define get_pkmap_color get_pkmap_color
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static inline int get_pkmap_color(struct page *page)
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{
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return DCACHE_ALIAS(page_to_phys(page));
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}
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extern unsigned int last_pkmap_nr_arr[];
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static inline unsigned int get_next_pkmap_nr(unsigned int color)
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{
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last_pkmap_nr_arr[color] =
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(last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK;
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return last_pkmap_nr_arr[color] + color;
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}
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static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
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{
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return pkmap_nr < DCACHE_N_COLORS;
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}
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static inline int get_pkmap_entries_count(unsigned int color)
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{
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return LAST_PKMAP / DCACHE_N_COLORS;
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}
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extern wait_queue_head_t pkmap_map_wait_arr[];
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static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
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{
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return pkmap_map_wait_arr + color;
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}
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#endif
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extern pte_t *pkmap_page_table;
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void *kmap_high(struct page *page);
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void kunmap_high(struct page *page);
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static inline void *kmap(struct page *page)
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{
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/* Check if this memory layout is broken because PKMAP overlaps
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* page table.
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*/
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BUILD_BUG_ON(PKMAP_BASE <
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XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE);
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BUG_ON(in_interrupt());
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if (!PageHighMem(page))
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return page_address(page);
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return kmap_high(page);
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}
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static inline void kunmap(struct page *page)
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{
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BUG_ON(in_interrupt());
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if (!PageHighMem(page))
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return;
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kunmap_high(page);
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}
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static inline void flush_cache_kmaps(void)
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{
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flush_cache_all();
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}
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void *kmap_atomic(struct page *page);
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void __kunmap_atomic(void *kvaddr);
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void kmap_init(void);
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#endif
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