cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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page.h (3014B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#ifndef _ASM_PAGE_H
      6#define _ASM_PAGE_H
      7
      8#include <linux/const.h>
      9#include <asm/addrspace.h>
     10
     11/*
     12 * PAGE_SHIFT determines the page size
     13 */
     14#ifdef CONFIG_PAGE_SIZE_4KB
     15#define PAGE_SHIFT	12
     16#endif
     17#ifdef CONFIG_PAGE_SIZE_16KB
     18#define PAGE_SHIFT	14
     19#endif
     20#ifdef CONFIG_PAGE_SIZE_64KB
     21#define PAGE_SHIFT	16
     22#endif
     23#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
     24#define PAGE_MASK	(~(PAGE_SIZE - 1))
     25
     26#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
     27#define HPAGE_SIZE	(_AC(1, UL) << HPAGE_SHIFT)
     28#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
     29#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
     30
     31#ifndef __ASSEMBLY__
     32
     33#include <linux/kernel.h>
     34#include <linux/pfn.h>
     35
     36#define MAX_DMA32_PFN  (1UL << (32 - PAGE_SHIFT))
     37
     38/*
     39 * It's normally defined only for FLATMEM config but it's
     40 * used in our early mem init code for all memory models.
     41 * So always define it.
     42 */
     43#define ARCH_PFN_OFFSET	PFN_UP(PHYS_OFFSET)
     44
     45extern void clear_page(void *page);
     46extern void copy_page(void *to, void *from);
     47
     48#define clear_user_page(page, vaddr, pg)	clear_page(page)
     49#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
     50
     51extern unsigned long shm_align_mask;
     52
     53struct page;
     54struct vm_area_struct;
     55void copy_user_highpage(struct page *to, struct page *from,
     56	      unsigned long vaddr, struct vm_area_struct *vma);
     57
     58#define __HAVE_ARCH_COPY_USER_HIGHPAGE
     59
     60typedef struct { unsigned long pte; } pte_t;
     61#define pte_val(x)	((x).pte)
     62#define __pte(x)	((pte_t) { (x) })
     63typedef struct page *pgtable_t;
     64
     65typedef struct { unsigned long pgd; } pgd_t;
     66#define pgd_val(x)	((x).pgd)
     67#define __pgd(x)	((pgd_t) { (x) })
     68
     69/*
     70 * Manipulate page protection bits
     71 */
     72typedef struct { unsigned long pgprot; } pgprot_t;
     73#define pgprot_val(x)	((x).pgprot)
     74#define __pgprot(x)	((pgprot_t) { (x) })
     75#define pte_pgprot(x)	__pgprot(pte_val(x) & ~_PFN_MASK)
     76
     77#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
     78
     79/*
     80 * __pa()/__va() should be used only during mem init.
     81 */
     82#define __pa(x)		PHYSADDR(x)
     83#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
     84
     85#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
     86
     87#ifdef CONFIG_FLATMEM
     88
     89static inline int pfn_valid(unsigned long pfn)
     90{
     91	/* avoid <linux/mm.h> include hell */
     92	extern unsigned long max_mapnr;
     93	unsigned long pfn_offset = ARCH_PFN_OFFSET;
     94
     95	return pfn >= pfn_offset && pfn < max_mapnr;
     96}
     97
     98#endif
     99
    100#define virt_to_pfn(kaddr)	PFN_DOWN(virt_to_phys((void *)(kaddr)))
    101#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
    102
    103extern int __virt_addr_valid(volatile void *kaddr);
    104#define virt_addr_valid(kaddr)	__virt_addr_valid((volatile void *)(kaddr))
    105
    106#define VM_DATA_DEFAULT_FLAGS \
    107	(VM_READ | VM_WRITE | \
    108	 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
    109	 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
    110
    111#include <asm-generic/memory_model.h>
    112#include <asm-generic/getorder.h>
    113
    114#endif /* !__ASSEMBLY__ */
    115
    116#endif /* _ASM_PAGE_H */