337 lines
10 KiB
C
337 lines
10 KiB
C
|
/*
|
||
|
|
* 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. */
|
||
|
|
#define PAGE_SHIFT HV_LOG2_PAGE_SIZE_SMALL
|
||
|
|
#define HPAGE_SHIFT HV_LOG2_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 and makes it potentially useful to implement HIGHPTE at some point.
|
||
|
|
* However, 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 2
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
||
|
|
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Each memory controller has PAs distinct in their high bits. */
|
||
|
|
#define NR_PA_HIGHBIT_SHIFT (CHIP_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 0xfffffff700000000,
|
||
|
|
* 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 CHIP_PA_WIDTH() + 2 > CHIP_VA_WIDTH()
|
||
|
|
# error Too much PA to map with the VA available!
|
||
|
|
#endif
|
||
|
|
#define HALF_VA_SPACE (_AC(1, UL) << (CHIP_VA_WIDTH() - 1))
|
||
|
|
|
||
|
|
#define MEM_LOW_END (HALF_VA_SPACE - 1) /* low half */
|
||
|
|
#define MEM_HIGH_START (-HALF_VA_SPACE) /* high half */
|
||
|
|
#define PAGE_OFFSET MEM_HIGH_START
|
||
|
|
#define _VMALLOC_START _AC(0xfffffff500000000, UL) /* 4 GB */
|
||
|
|
#define HUGE_VMAP_BASE _AC(0xfffffff600000000, UL) /* 4 GB */
|
||
|
|
#define MEM_SV_START _AC(0xfffffff700000000, UL) /* 256 MB */
|
||
|
|
#define MEM_SV_INTRPT MEM_SV_START
|
||
|
|
#define MEM_MODULE_START _AC(0xfffffff710000000, UL) /* 256 MB */
|
||
|
|
#define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024))
|
||
|
|
#define MEM_HV_START _AC(0xfffffff800000000, UL) /* 32 GB */
|
||
|
|
|
||
|
|
/* Highest DTLB address we will use */
|
||
|
|
#define KERNEL_HIGH_VADDR MEM_SV_START
|
||
|
|
|
||
|
|
/* Since we don't currently provide any fixmaps, we use an impossible VA. */
|
||
|
|
#define FIXADDR_TOP MEM_HV_START
|
||
|
|
|
||
|
|
#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_INTRPT 0xfe000000
|
||
|
|
* MEM_SV_INTRPT (kernel code) 0xfd000000
|
||
|
|
* MEM_USER_INTRPT (user vector) 0xfc000000
|
||
|
|
* FIX_KMAP_xxx 0xf8000000 (via NR_CPUS * KM_TYPE_NR)
|
||
|
|
* PKMAP_BASE 0xf7000000 (via LAST_PKMAP)
|
||
|
|
* HUGE_VMAP 0xf3000000 (via CONFIG_NR_HUGE_VMAPS)
|
||
|
|
* VMALLOC_START 0xf0000000 (via __VMALLOC_RESERVE)
|
||
|
|
* mapped LOWMEM 0xc0000000
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define MEM_USER_INTRPT _AC(0xfc000000, UL)
|
||
|
|
#if CONFIG_KERNEL_PL == 1
|
||
|
|
#define MEM_SV_INTRPT _AC(0xfd000000, UL)
|
||
|
|
#define MEM_HV_INTRPT _AC(0xfe000000, UL)
|
||
|
|
#else
|
||
|
|
#define MEM_GUEST_INTRPT _AC(0xfd000000, UL)
|
||
|
|
#define MEM_SV_INTRPT _AC(0xfe000000, UL)
|
||
|
|
#define MEM_HV_INTRPT _AC(0xff000000, UL)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#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__ */
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
|
||
|
|
#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);
|
||
|
|
|
||
|
|
#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 */
|