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https://github.com/brain-hackers/linux-brain.git
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fe9041c245
The arm architecture had a VM_ARM_DMA_CONSISTENT flag to mark DMA coherent remapping for a while. Lift this flag to common code so that we can use it generically. We also check it in the only place VM_USERMAP is directly check so that we can entirely replace that flag as well (although I'm not even sure why we'd want to allow remapping DMA appings, but I'd rather not change behavior). Signed-off-by: Christoph Hellwig <hch@lst.de>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifdef CONFIG_MMU
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <asm/pgtable.h>
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/* the upper-most page table pointer */
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extern pmd_t *top_pmd;
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extern int icache_size;
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/*
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* 0xffff8000 to 0xffffffff is reserved for any ARM architecture
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* specific hacks for copying pages efficiently, while 0xffff4000
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* is reserved for VIPT aliasing flushing by generic code.
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*
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* Note that we don't allow VIPT aliasing caches with SMP.
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*/
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#define COPYPAGE_MINICACHE 0xffff8000
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#define COPYPAGE_V6_FROM 0xffff8000
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#define COPYPAGE_V6_TO 0xffffc000
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/* PFN alias flushing, for VIPT caches */
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#define FLUSH_ALIAS_START 0xffff4000
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static inline void set_top_pte(unsigned long va, pte_t pte)
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{
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pte_t *ptep = pte_offset_kernel(top_pmd, va);
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set_pte_ext(ptep, pte, 0);
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local_flush_tlb_kernel_page(va);
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}
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static inline pte_t get_top_pte(unsigned long va)
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{
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pte_t *ptep = pte_offset_kernel(top_pmd, va);
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return *ptep;
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}
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static inline pmd_t *pmd_off_k(unsigned long virt)
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{
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return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
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}
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struct mem_type {
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pteval_t prot_pte;
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pteval_t prot_pte_s2;
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pmdval_t prot_l1;
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pmdval_t prot_sect;
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unsigned int domain;
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};
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const struct mem_type *get_mem_type(unsigned int type);
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extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
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/*
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* ARM specific vm_struct->flags bits.
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*/
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/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
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#define VM_ARM_SECTION_MAPPING 0x80000000
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/* permanent static mappings from iotable_init() */
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#define VM_ARM_STATIC_MAPPING 0x40000000
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/* empty mapping */
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#define VM_ARM_EMPTY_MAPPING 0x20000000
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/* mapping type (attributes) for permanent static mappings */
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#define VM_ARM_MTYPE(mt) ((mt) << 20)
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#define VM_ARM_MTYPE_MASK (0x1f << 20)
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struct static_vm {
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struct vm_struct vm;
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struct list_head list;
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};
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extern struct list_head static_vmlist;
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extern struct static_vm *find_static_vm_vaddr(void *vaddr);
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extern __init void add_static_vm_early(struct static_vm *svm);
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#endif
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#ifdef CONFIG_ZONE_DMA
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extern phys_addr_t arm_dma_limit;
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extern unsigned long arm_dma_pfn_limit;
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#else
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#define arm_dma_limit ((phys_addr_t)~0)
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#define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
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#endif
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extern phys_addr_t arm_lowmem_limit;
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void __init bootmem_init(void);
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void arm_mm_memblock_reserve(void);
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void dma_contiguous_remap(void);
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unsigned long __clear_cr(unsigned long mask);
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