346 lines
10 KiB
C
346 lines
10 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_PAGE_H
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#define _ASM_TILE_PAGE_H
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#include <linux/const.h>
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#include <hv/hypervisor.h>
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#include <arch/chip.h>
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/* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */
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#if defined(CONFIG_PAGE_SIZE_4KB) /* tilepro only */
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#define PAGE_SHIFT 12
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#define CTX_PAGE_FLAG HV_CTX_PG_SM_4K
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#elif defined(CONFIG_PAGE_SIZE_16KB)
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#define PAGE_SHIFT 14
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#define CTX_PAGE_FLAG HV_CTX_PG_SM_16K
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#elif defined(CONFIG_PAGE_SIZE_64KB)
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#define PAGE_SHIFT 16
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#define CTX_PAGE_FLAG HV_CTX_PG_SM_64K
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#else
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#error Page size not specified in Kconfig
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#endif
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#define HPAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_LARGE
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE - 1))
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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/*
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* If the Kconfig doesn't specify, set a maximum zone order that
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* is enough so that we can create huge pages from small pages given
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* the respective sizes of the two page types. See <linux/mmzone.h>.
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*/
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#ifndef CONFIG_FORCE_MAX_ZONEORDER
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#define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1)
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#endif
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <linux/string.h>
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struct page;
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static inline void clear_page(void *page)
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{
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memset(page, 0, PAGE_SIZE);
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}
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static inline void copy_page(void *to, void *from)
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{
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memcpy(to, from, PAGE_SIZE);
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}
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static inline void clear_user_page(void *page, unsigned long vaddr,
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struct page *pg)
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{
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clear_page(page);
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}
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static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
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struct page *topage)
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{
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copy_page(to, from);
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}
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/*
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* Hypervisor page tables are made of the same basic structure.
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*/
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typedef HV_PTE pte_t;
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typedef HV_PTE pgd_t;
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typedef HV_PTE pgprot_t;
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/*
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* User L2 page tables are managed as one L2 page table per page,
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* because we use the page allocator for them. This keeps the allocation
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* simple, but it's also inefficient, since L2 page tables are much smaller
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* than pages (currently 2KB vs 64KB). So we should revisit this.
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*/
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typedef struct page *pgtable_t;
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/* Must be a macro since it is used to create constants. */
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#define __pgprot(val) hv_pte(val)
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/* Rarely-used initializers, typically with a "zero" value. */
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#define __pte(x) hv_pte(x)
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#define __pgd(x) hv_pte(x)
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static inline u64 pgprot_val(pgprot_t pgprot)
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{
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return hv_pte_val(pgprot);
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}
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static inline u64 pte_val(pte_t pte)
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{
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return hv_pte_val(pte);
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}
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static inline u64 pgd_val(pgd_t pgd)
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{
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return hv_pte_val(pgd);
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}
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#ifdef __tilegx__
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typedef HV_PTE pmd_t;
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#define __pmd(x) hv_pte(x)
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static inline u64 pmd_val(pmd_t pmd)
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{
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return hv_pte_val(pmd);
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}
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#endif
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static inline __attribute_const__ int get_order(unsigned long size)
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{
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return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT);
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}
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#endif /* !__ASSEMBLY__ */
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define HUGE_MAX_HSTATE 6
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#ifdef CONFIG_HUGETLB_PAGE
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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/* Allow overriding how much VA or PA the kernel will use. */
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#define MAX_PA_WIDTH CHIP_PA_WIDTH()
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#define MAX_VA_WIDTH CHIP_VA_WIDTH()
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/* Each memory controller has PAs distinct in their high bits. */
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#define NR_PA_HIGHBIT_SHIFT (MAX_PA_WIDTH - CHIP_LOG_NUM_MSHIMS())
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#define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS())
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#define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT)
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#define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT))
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#ifdef __tilegx__
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/*
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* We reserve the lower half of memory for user-space programs, and the
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* upper half for system code. We re-map all of physical memory in the
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* upper half, which takes a quarter of our VA space. Then we have
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* the vmalloc regions. The supervisor code lives at the highest address,
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* with the hypervisor above that.
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*
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* Loadable kernel modules are placed immediately after the static
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* supervisor code, with each being allocated a 256MB region of
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* address space, so we don't have to worry about the range of "jal"
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* and other branch instructions.
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*
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* For now we keep life simple and just allocate one pmd (4GB) for vmalloc.
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* Similarly, for now we don't play any struct page mapping games.
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*/
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#if MAX_PA_WIDTH + 2 > MAX_VA_WIDTH
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# error Too much PA to map with the VA available!
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#endif
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#define PAGE_OFFSET (-(_AC(1, UL) << (MAX_VA_WIDTH - 1)))
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#define KERNEL_HIGH_VADDR _AC(0xfffffff800000000, UL) /* high 32GB */
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#define FIXADDR_BASE (KERNEL_HIGH_VADDR - 0x300000000) /* 4 GB */
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#define FIXADDR_TOP (KERNEL_HIGH_VADDR - 0x200000000) /* 4 GB */
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#define _VMALLOC_START FIXADDR_TOP
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#define MEM_SV_START (KERNEL_HIGH_VADDR - 0x100000000) /* 256 MB */
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#define MEM_MODULE_START (MEM_SV_START + (256*1024*1024)) /* 256 MB */
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#define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024))
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#else /* !__tilegx__ */
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/*
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* A PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 768MB.
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* If you want more physical memory than this then see the CONFIG_HIGHMEM
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* option in the kernel configuration.
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*
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* The top 16MB chunk in the table below is unavailable to Linux. Since
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* the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000
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* (depending on whether the kernel is at PL2 or Pl1), we map all of the
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* bottom of RAM at this address with a huge page table entry to minimize
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* its ITLB footprint (as well as at PAGE_OFFSET). The last architected
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* requirement is that user interrupt vectors live at 0xfc000000, so we
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* make that range of memory available to user processes. The remaining
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* regions are sized as shown; the first four addresses use the PL 1
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* values, and after that, we show "typical" values, since the actual
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* addresses depend on kernel #defines.
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*
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* MEM_HV_START 0xfe000000
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* MEM_SV_START (kernel code) 0xfd000000
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* MEM_USER_INTRPT (user vector) 0xfc000000
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* FIX_KMAP_xxx 0xfa000000 (via NR_CPUS * KM_TYPE_NR)
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* PKMAP_BASE 0xf9000000 (via LAST_PKMAP)
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* VMALLOC_START 0xf7000000 (via VMALLOC_RESERVE)
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* mapped LOWMEM 0xc0000000
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*/
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#define MEM_USER_INTRPT _AC(0xfc000000, UL)
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#define MEM_SV_START _AC(0xfd000000, UL)
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#define MEM_HV_START _AC(0xfe000000, UL)
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#define INTRPT_SIZE 0x4000
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/* Tolerate page size larger than the architecture interrupt region size. */
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#if PAGE_SIZE > INTRPT_SIZE
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#undef INTRPT_SIZE
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#define INTRPT_SIZE PAGE_SIZE
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#endif
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#define KERNEL_HIGH_VADDR MEM_USER_INTRPT
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#define FIXADDR_TOP (KERNEL_HIGH_VADDR - PAGE_SIZE)
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#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
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/* On 32-bit architectures we mix kernel modules in with other vmaps. */
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#define MEM_MODULE_START VMALLOC_START
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#define MEM_MODULE_END VMALLOC_END
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#endif /* __tilegx__ */
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#if !defined(__ASSEMBLY__) && !defined(VDSO_BUILD)
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#ifdef CONFIG_HIGHMEM
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/* Map kernel virtual addresses to page frames, in HPAGE_SIZE chunks. */
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extern unsigned long pbase_map[];
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extern void *vbase_map[];
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static inline unsigned long kaddr_to_pfn(const volatile void *_kaddr)
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{
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unsigned long kaddr = (unsigned long)_kaddr;
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return pbase_map[kaddr >> HPAGE_SHIFT] +
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((kaddr & (HPAGE_SIZE - 1)) >> PAGE_SHIFT);
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}
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static inline void *pfn_to_kaddr(unsigned long pfn)
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{
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return vbase_map[__pfn_to_highbits(pfn)] + (pfn << PAGE_SHIFT);
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}
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static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
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{
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unsigned long pfn = kaddr_to_pfn(kaddr);
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return ((phys_addr_t)pfn << PAGE_SHIFT) +
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((unsigned long)kaddr & (PAGE_SIZE-1));
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}
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static inline void *phys_to_virt(phys_addr_t paddr)
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{
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return pfn_to_kaddr(paddr >> PAGE_SHIFT) + (paddr & (PAGE_SIZE-1));
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}
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/* With HIGHMEM, we pack PAGE_OFFSET through high_memory with all valid VAs. */
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static inline int virt_addr_valid(const volatile void *kaddr)
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{
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extern void *high_memory; /* copied from <linux/mm.h> */
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return ((unsigned long)kaddr >= PAGE_OFFSET && kaddr < high_memory);
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}
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#else /* !CONFIG_HIGHMEM */
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static inline unsigned long kaddr_to_pfn(const volatile void *kaddr)
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{
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return ((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT;
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}
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static inline void *pfn_to_kaddr(unsigned long pfn)
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{
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return (void *)((pfn << PAGE_SHIFT) + PAGE_OFFSET);
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}
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static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
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{
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return (phys_addr_t)((unsigned long)kaddr - PAGE_OFFSET);
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}
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static inline void *phys_to_virt(phys_addr_t paddr)
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{
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return (void *)((unsigned long)paddr + PAGE_OFFSET);
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}
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/* Check that the given address is within some mapped range of PAs. */
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#define virt_addr_valid(kaddr) pfn_valid(kaddr_to_pfn(kaddr))
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#endif /* !CONFIG_HIGHMEM */
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/* All callers are not consistent in how they call these functions. */
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#define __pa(kaddr) virt_to_phys((void *)(unsigned long)(kaddr))
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#define __va(paddr) phys_to_virt((phys_addr_t)(paddr))
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extern int devmem_is_allowed(unsigned long pagenr);
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#ifdef CONFIG_FLATMEM
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static inline int pfn_valid(unsigned long pfn)
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{
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return pfn < max_mapnr;
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}
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#endif
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/* Provide as macros since these require some other headers included. */
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#define page_to_pa(page) ((phys_addr_t)(page_to_pfn(page)) << PAGE_SHIFT)
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#define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr)))
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#define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page))
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/*
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* The kernel text is mapped at MEM_SV_START as read-only. To allow
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* modifying kernel text, it is also mapped at PAGE_OFFSET as read-write.
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* This macro converts a kernel address to its writable kernel text mapping,
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* which is used to modify the text code on a running kernel by kgdb,
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* ftrace, kprobe, jump label, etc.
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*/
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#define ktext_writable_addr(kaddr) \
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((unsigned long)(kaddr) - MEM_SV_START + PAGE_OFFSET)
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struct mm_struct;
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extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
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extern pte_t *virt_to_kpte(unsigned long kaddr);
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#endif /* !__ASSEMBLY__ */
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#define VM_DATA_DEFAULT_FLAGS \
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(VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#endif /* _ASM_TILE_PAGE_H */
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