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Diffstat (limited to 'arch/parisc/include/asm/page.h')
| -rw-r--r-- | arch/parisc/include/asm/page.h | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/page.h b/arch/parisc/include/asm/page.h new file mode 100644 index 000000000..0561568f7 --- /dev/null +++ b/arch/parisc/include/asm/page.h @@ -0,0 +1,192 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _PARISC_PAGE_H +#define _PARISC_PAGE_H + +#include <linux/const.h> + +#if defined(CONFIG_PARISC_PAGE_SIZE_4KB) +# define PAGE_SHIFT 12 +#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) +# define PAGE_SHIFT 14 +#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) +# define PAGE_SHIFT 16 +#else +# error "unknown default kernel page size" +#endif +#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) +#define PAGE_MASK (~(PAGE_SIZE-1)) + + +#ifndef __ASSEMBLY__ + +#include <asm/types.h> +#include <asm/cache.h> + +#define clear_page(page) clear_page_asm((void *)(page)) +#define copy_page(to, from) copy_page_asm((void *)(to), (void *)(from)) + +struct page; + +void clear_page_asm(void *page); +void copy_page_asm(void *to, void *from); +#define clear_user_page(vto, vaddr, page) clear_page_asm(vto) +void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, + struct page *pg); + +/* + * These are used to make use of C type-checking.. + */ +#define STRICT_MM_TYPECHECKS +#ifdef STRICT_MM_TYPECHECKS +typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */ + +/* NOTE: even on 64 bits, these entries are __u32 because we allocate + * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */ +typedef struct { __u32 pgd; } pgd_t; +typedef struct { unsigned long pgprot; } pgprot_t; + +#if CONFIG_PGTABLE_LEVELS == 3 +typedef struct { __u32 pmd; } pmd_t; +#define __pmd(x) ((pmd_t) { (x) } ) +/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */ +#define pmd_val(x) ((x).pmd + 0) +#endif + +#define pte_val(x) ((x).pte) +#define pgd_val(x) ((x).pgd + 0) +#define pgprot_val(x) ((x).pgprot) + +#define __pte(x) ((pte_t) { (x) } ) +#define __pgd(x) ((pgd_t) { (x) } ) +#define __pgprot(x) ((pgprot_t) { (x) } ) + +#else +/* + * .. while these make it easier on the compiler + */ +typedef unsigned long pte_t; + +#if CONFIG_PGTABLE_LEVELS == 3 +typedef __u32 pmd_t; +#define pmd_val(x) (x) +#define __pmd(x) (x) +#endif + +typedef __u32 pgd_t; +typedef unsigned long pgprot_t; + +#define pte_val(x) (x) +#define pgd_val(x) (x) +#define pgprot_val(x) (x) + +#define __pte(x) (x) +#define __pgd(x) (x) +#define __pgprot(x) (x) + +#endif /* STRICT_MM_TYPECHECKS */ + +#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) +#if CONFIG_PGTABLE_LEVELS == 3 +#define set_pud(pudptr, pudval) (*(pudptr) = (pudval)) +#endif + +typedef struct page *pgtable_t; + +typedef struct __physmem_range { + unsigned long start_pfn; + unsigned long pages; /* PAGE_SIZE pages */ +} physmem_range_t; + +extern physmem_range_t pmem_ranges[]; +extern int npmem_ranges; + +#endif /* !__ASSEMBLY__ */ + +/* WARNING: The definitions below must match exactly to sizeof(pte_t) + * etc + */ +#ifdef CONFIG_64BIT +#define BITS_PER_PTE_ENTRY 3 +#define BITS_PER_PMD_ENTRY 2 +#define BITS_PER_PGD_ENTRY 2 +#else +#define BITS_PER_PTE_ENTRY 2 +#define BITS_PER_PMD_ENTRY 2 +#define BITS_PER_PGD_ENTRY 2 +#endif +#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY) +#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY) +#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY) + +#define LINUX_GATEWAY_SPACE 0 + +/* This governs the relationship between virtual and physical addresses. + * If you alter it, make sure to take care of our various fixed mapping + * segments in fixmap.h */ +#ifdef CONFIG_64BIT +#define __PAGE_OFFSET_DEFAULT (0x40000000) /* 1GB */ +#else +#define __PAGE_OFFSET_DEFAULT (0x10000000) /* 256MB */ +#endif + +#if defined(BOOTLOADER) +#define __PAGE_OFFSET (0) /* bootloader uses physical addresses */ +#else +#define __PAGE_OFFSET __PAGE_OFFSET_DEFAULT +#endif /* BOOTLOADER */ + +#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) + +/* The size of the gateway page (we leave lots of room for expansion) */ +#define GATEWAY_PAGE_SIZE 0x4000 + +/* The start of the actual kernel binary---used in vmlinux.lds.S + * Leave some space after __PAGE_OFFSET for detecting kernel null + * ptr derefs */ +#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000) + +/* These macros don't work for 64-bit C code -- don't allow in C at all */ +#ifdef __ASSEMBLY__ +# define PA(x) ((x)-__PAGE_OFFSET) +# define VA(x) ((x)+__PAGE_OFFSET) +#endif +#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) +#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) + +#ifndef CONFIG_SPARSEMEM +#define pfn_valid(pfn) ((pfn) < max_mapnr) +#endif + +#ifdef CONFIG_HUGETLB_PAGE +#define HPAGE_SHIFT PMD_SHIFT /* fixed for transparent huge pages */ +#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) + +#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) +# define REAL_HPAGE_SHIFT 20 /* 20 = 1MB */ +# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M +#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) +# define REAL_HPAGE_SHIFT 22 /* 22 = 4MB */ +# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M +#else +# define REAL_HPAGE_SHIFT 24 /* 24 = 16MB */ +# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M +#endif +#endif /* CONFIG_HUGETLB_PAGE */ + +#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) + +#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) +#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) + +#include <asm-generic/memory_model.h> +#include <asm-generic/getorder.h> +#include <asm/pdc.h> + +#define PAGE0 ((struct zeropage *)absolute_pointer(__PAGE_OFFSET)) + +/* DEFINITION OF THE ZERO-PAGE (PAG0) */ +/* based on work by Jason Eckhardt (jason@equator.com) */ + +#endif /* _PARISC_PAGE_H */ |