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Diffstat (limited to 'kernel/arch/tile/include/asm/page.h')
| -rw-r--r-- | kernel/arch/tile/include/asm/page.h | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/kernel/arch/tile/include/asm/page.h b/kernel/arch/tile/include/asm/page.h new file mode 100644 index 000000000..a213a8d84 --- /dev/null +++ b/kernel/arch/tile/include/asm/page.h @@ -0,0 +1,333 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_PAGE_H +#define _ASM_TILE_PAGE_H + +#include <linux/const.h> +#include <hv/hypervisor.h> +#include <arch/chip.h> + +/* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */ +#if defined(CONFIG_PAGE_SIZE_16KB) +#define PAGE_SHIFT 14 +#define CTX_PAGE_FLAG HV_CTX_PG_SM_16K +#elif defined(CONFIG_PAGE_SIZE_64KB) +#define PAGE_SHIFT 16 +#define CTX_PAGE_FLAG HV_CTX_PG_SM_64K +#else +#define PAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_SMALL +#define CTX_PAGE_FLAG 0 +#endif +#define HPAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_LARGE + +#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) +#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) + +#define PAGE_MASK (~(PAGE_SIZE - 1)) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) + +/* + * If the Kconfig doesn't specify, set a maximum zone order that + * is enough so that we can create huge pages from small pages given + * the respective sizes of the two page types. See <linux/mmzone.h>. + */ +#ifndef CONFIG_FORCE_MAX_ZONEORDER +#define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1) +#endif + +#ifndef __ASSEMBLY__ + +#include <linux/types.h> +#include <linux/string.h> + +struct page; + +static inline void clear_page(void *page) +{ + memset(page, 0, PAGE_SIZE); +} + +static inline void copy_page(void *to, void *from) +{ + memcpy(to, from, PAGE_SIZE); +} + +static inline void clear_user_page(void *page, unsigned long vaddr, + struct page *pg) +{ + clear_page(page); +} + +static inline void copy_user_page(void *to, void *from, unsigned long vaddr, + struct page *topage) +{ + copy_page(to, from); +} + +/* + * Hypervisor page tables are made of the same basic structure. + */ + +typedef HV_PTE pte_t; +typedef HV_PTE pgd_t; +typedef HV_PTE pgprot_t; + +/* + * User L2 page tables are managed as one L2 page table per page, + * because we use the page allocator for them. This keeps the allocation + * simple, but it's also inefficient, since L2 page tables are much smaller + * than pages (currently 2KB vs 64KB). So we should revisit this. + */ +typedef struct page *pgtable_t; + +/* Must be a macro since it is used to create constants. */ +#define __pgprot(val) hv_pte(val) + +/* Rarely-used initializers, typically with a "zero" value. */ +#define __pte(x) hv_pte(x) +#define __pgd(x) hv_pte(x) + +static inline u64 pgprot_val(pgprot_t pgprot) +{ + return hv_pte_val(pgprot); +} + +static inline u64 pte_val(pte_t pte) +{ + return hv_pte_val(pte); +} + +static inline u64 pgd_val(pgd_t pgd) +{ + return hv_pte_val(pgd); +} + +#ifdef __tilegx__ + +typedef HV_PTE pmd_t; + +#define __pmd(x) hv_pte(x) + +static inline u64 pmd_val(pmd_t pmd) +{ + return hv_pte_val(pmd); +} + +#endif + +static inline __attribute_const__ int get_order(unsigned long size) +{ + return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT); +} + +#endif /* !__ASSEMBLY__ */ + +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) + +#define HUGE_MAX_HSTATE 6 + +#ifdef CONFIG_HUGETLB_PAGE +#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA +#endif + +/* Allow overriding how much VA or PA the kernel will use. */ +#define MAX_PA_WIDTH CHIP_PA_WIDTH() +#define MAX_VA_WIDTH CHIP_VA_WIDTH() + +/* Each memory controller has PAs distinct in their high bits. */ +#define NR_PA_HIGHBIT_SHIFT (MAX_PA_WIDTH - CHIP_LOG_NUM_MSHIMS()) +#define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS()) +#define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT) +#define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT)) + +#ifdef __tilegx__ + +/* + * We reserve the lower half of memory for user-space programs, and the + * upper half for system code. We re-map all of physical memory in the + * upper half, which takes a quarter of our VA space. Then we have + * the vmalloc regions. The supervisor code lives at the highest address, + * with the hypervisor above that. + * + * Loadable kernel modules are placed immediately after the static + * supervisor code, with each being allocated a 256MB region of + * address space, so we don't have to worry about the range of "jal" + * and other branch instructions. + * + * For now we keep life simple and just allocate one pmd (4GB) for vmalloc. + * Similarly, for now we don't play any struct page mapping games. + */ + +#if MAX_PA_WIDTH + 2 > MAX_VA_WIDTH +# error Too much PA to map with the VA available! +#endif + +#define PAGE_OFFSET (-(_AC(1, UL) << (MAX_VA_WIDTH - 1))) +#define KERNEL_HIGH_VADDR _AC(0xfffffff800000000, UL) /* high 32GB */ +#define FIXADDR_BASE (KERNEL_HIGH_VADDR - 0x300000000) /* 4 GB */ +#define FIXADDR_TOP (KERNEL_HIGH_VADDR - 0x200000000) /* 4 GB */ +#define _VMALLOC_START FIXADDR_TOP +#define MEM_SV_START (KERNEL_HIGH_VADDR - 0x100000000) /* 256 MB */ +#define MEM_MODULE_START (MEM_SV_START + (256*1024*1024)) /* 256 MB */ +#define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024)) + +#else /* !__tilegx__ */ + +/* + * A PAGE_OFFSET of 0xC0000000 means that the kernel has + * a virtual address space of one gigabyte, which limits the + * amount of physical memory you can use to about 768MB. + * If you want more physical memory than this then see the CONFIG_HIGHMEM + * option in the kernel configuration. + * + * The top 16MB chunk in the table below is unavailable to Linux. Since + * the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000 + * (depending on whether the kernel is at PL2 or Pl1), we map all of the + * bottom of RAM at this address with a huge page table entry to minimize + * its ITLB footprint (as well as at PAGE_OFFSET). The last architected + * requirement is that user interrupt vectors live at 0xfc000000, so we + * make that range of memory available to user processes. The remaining + * regions are sized as shown; the first four addresses use the PL 1 + * values, and after that, we show "typical" values, since the actual + * addresses depend on kernel #defines. + * + * MEM_HV_START 0xfe000000 + * MEM_SV_START (kernel code) 0xfd000000 + * MEM_USER_INTRPT (user vector) 0xfc000000 + * FIX_KMAP_xxx 0xfa000000 (via NR_CPUS * KM_TYPE_NR) + * PKMAP_BASE 0xf9000000 (via LAST_PKMAP) + * VMALLOC_START 0xf7000000 (via VMALLOC_RESERVE) + * mapped LOWMEM 0xc0000000 + */ + +#define MEM_USER_INTRPT _AC(0xfc000000, UL) +#define MEM_SV_START _AC(0xfd000000, UL) +#define MEM_HV_START _AC(0xfe000000, UL) + +#define INTRPT_SIZE 0x4000 + +/* Tolerate page size larger than the architecture interrupt region size. */ +#if PAGE_SIZE > INTRPT_SIZE +#undef INTRPT_SIZE +#define INTRPT_SIZE PAGE_SIZE +#endif + +#define KERNEL_HIGH_VADDR MEM_USER_INTRPT +#define FIXADDR_TOP (KERNEL_HIGH_VADDR - PAGE_SIZE) + +#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) + +/* On 32-bit architectures we mix kernel modules in with other vmaps. */ +#define MEM_MODULE_START VMALLOC_START +#define MEM_MODULE_END VMALLOC_END + +#endif /* __tilegx__ */ + +#if !defined(__ASSEMBLY__) && !defined(VDSO_BUILD) + +#ifdef CONFIG_HIGHMEM + +/* Map kernel virtual addresses to page frames, in HPAGE_SIZE chunks. */ +extern unsigned long pbase_map[]; +extern void *vbase_map[]; + +static inline unsigned long kaddr_to_pfn(const volatile void *_kaddr) +{ + unsigned long kaddr = (unsigned long)_kaddr; + return pbase_map[kaddr >> HPAGE_SHIFT] + + ((kaddr & (HPAGE_SIZE - 1)) >> PAGE_SHIFT); +} + +static inline void *pfn_to_kaddr(unsigned long pfn) +{ + return vbase_map[__pfn_to_highbits(pfn)] + (pfn << PAGE_SHIFT); +} + +static inline phys_addr_t virt_to_phys(const volatile void *kaddr) +{ + unsigned long pfn = kaddr_to_pfn(kaddr); + return ((phys_addr_t)pfn << PAGE_SHIFT) + + ((unsigned long)kaddr & (PAGE_SIZE-1)); +} + +static inline void *phys_to_virt(phys_addr_t paddr) +{ + return pfn_to_kaddr(paddr >> PAGE_SHIFT) + (paddr & (PAGE_SIZE-1)); +} + +/* With HIGHMEM, we pack PAGE_OFFSET through high_memory with all valid VAs. */ +static inline int virt_addr_valid(const volatile void *kaddr) +{ + extern void *high_memory; /* copied from <linux/mm.h> */ + return ((unsigned long)kaddr >= PAGE_OFFSET && kaddr < high_memory); +} + +#else /* !CONFIG_HIGHMEM */ + +static inline unsigned long kaddr_to_pfn(const volatile void *kaddr) +{ + return ((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT; +} + +static inline void *pfn_to_kaddr(unsigned long pfn) +{ + return (void *)((pfn << PAGE_SHIFT) + PAGE_OFFSET); +} + +static inline phys_addr_t virt_to_phys(const volatile void *kaddr) +{ + return (phys_addr_t)((unsigned long)kaddr - PAGE_OFFSET); +} + +static inline void *phys_to_virt(phys_addr_t paddr) +{ + return (void *)((unsigned long)paddr + PAGE_OFFSET); +} + +/* Check that the given address is within some mapped range of PAs. */ +#define virt_addr_valid(kaddr) pfn_valid(kaddr_to_pfn(kaddr)) + +#endif /* !CONFIG_HIGHMEM */ + +/* All callers are not consistent in how they call these functions. */ +#define __pa(kaddr) virt_to_phys((void *)(unsigned long)(kaddr)) +#define __va(paddr) phys_to_virt((phys_addr_t)(paddr)) + +extern int devmem_is_allowed(unsigned long pagenr); + +#ifdef CONFIG_FLATMEM +static inline int pfn_valid(unsigned long pfn) +{ + return pfn < max_mapnr; +} +#endif + +/* Provide as macros since these require some other headers included. */ +#define page_to_pa(page) ((phys_addr_t)(page_to_pfn(page)) << PAGE_SHIFT) +#define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr))) +#define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page)) + +struct mm_struct; +extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); +extern pte_t *virt_to_kpte(unsigned long kaddr); + +#endif /* !__ASSEMBLY__ */ + +#define VM_DATA_DEFAULT_FLAGS \ + (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#include <asm-generic/memory_model.h> + +#endif /* _ASM_TILE_PAGE_H */ |