arm64: Move swapper pagetable definitions
Move the kernel pagetable (both swapper and idmap) definitions from the generic asm/page.h to a new file, asm/kernel-pgtable.h. This is mostly a cosmetic change, to clean up the asm/page.h to get rid of the arch specific details which are not needed by the generic code. Also renames the symbols to prevent conflicts. e.g, BLOCK_SHIFT => SWAPPER_BLOCK_SHIFT Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Suzuki K. Poulose
Catalin Marinas
parent
fbc61a26e6
commit
87d1587bef
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@ -0,0 +1,65 @@
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/*
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* Kernel page table mapping
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*
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* Copyright (C) 2015 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_KERNEL_PGTABLE_H
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#define __ASM_KERNEL_PGTABLE_H
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/*
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* The idmap and swapper page tables need some space reserved in the kernel
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* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
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* map the kernel. With the 64K page configuration, swapper and idmap need to
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* map to pte level. The swapper also maps the FDT (see __create_page_tables
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* for more information). Note that the number of ID map translation levels
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* could be increased on the fly if system RAM is out of reach for the default
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* VA range, so 3 pages are reserved in all cases.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
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#else
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
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#endif
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#define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
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#define IDMAP_DIR_SIZE (3 * PAGE_SIZE)
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/* Initial memory map size */
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_BLOCK_SHIFT PAGE_SHIFT
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#define SWAPPER_BLOCK_SIZE PAGE_SIZE
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#define SWAPPER_TABLE_SHIFT PMD_SHIFT
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#else
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#define SWAPPER_BLOCK_SHIFT SECTION_SHIFT
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#define SWAPPER_BLOCK_SIZE SECTION_SIZE
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#define SWAPPER_TABLE_SHIFT PUD_SHIFT
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#endif
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/*
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* Initial memory map attributes.
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*/
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#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
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#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_MM_MMUFLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
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#else
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#define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
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#endif
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#endif /* __ASM_KERNEL_PGTABLE_H */
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@ -34,24 +34,6 @@
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#define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
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#define CONT_MASK (~(CONT_SIZE-1))
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/*
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* The idmap and swapper page tables need some space reserved in the kernel
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* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
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* map the kernel. With the 64K page configuration, swapper and idmap need to
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* map to pte level. The swapper also maps the FDT (see __create_page_tables
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* for more information). Note that the number of ID map translation levels
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* could be increased on the fly if system RAM is out of reach for the default
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* VA range, so 3 pages are reserved in all cases.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
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#else
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#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
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#endif
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#define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
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#define IDMAP_DIR_SIZE (3 * PAGE_SIZE)
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#ifndef __ASSEMBLY__
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#include <asm/pgtable-types.h>
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@ -29,6 +29,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/cache.h>
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#include <asm/cputype.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/memory.h>
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#include <asm/thread_info.h>
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#include <asm/pgtable-hwdef.h>
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@ -46,31 +47,9 @@
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#error TEXT_OFFSET must be less than 2MB
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#endif
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#ifdef CONFIG_ARM64_64K_PAGES
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#define BLOCK_SHIFT PAGE_SHIFT
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#define BLOCK_SIZE PAGE_SIZE
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#define TABLE_SHIFT PMD_SHIFT
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#else
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#define BLOCK_SHIFT SECTION_SHIFT
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#define BLOCK_SIZE SECTION_SIZE
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#define TABLE_SHIFT PUD_SHIFT
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#endif
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#define KERNEL_START _text
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#define KERNEL_END _end
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/*
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* Initial memory map attributes.
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*/
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#define PTE_FLAGS PTE_TYPE_PAGE | PTE_AF | PTE_SHARED
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#define PMD_FLAGS PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S
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#ifdef CONFIG_ARM64_64K_PAGES
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#define MM_MMUFLAGS PTE_ATTRINDX(MT_NORMAL) | PTE_FLAGS
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#else
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#define MM_MMUFLAGS PMD_ATTRINDX(MT_NORMAL) | PMD_FLAGS
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#endif
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/*
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* Kernel startup entry point.
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* ---------------------------
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@ -293,7 +272,7 @@ ENDPROC(preserve_boot_args)
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.macro create_pgd_entry, tbl, virt, tmp1, tmp2
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create_table_entry \tbl, \virt, PGDIR_SHIFT, PTRS_PER_PGD, \tmp1, \tmp2
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#if SWAPPER_PGTABLE_LEVELS == 3
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create_table_entry \tbl, \virt, TABLE_SHIFT, PTRS_PER_PTE, \tmp1, \tmp2
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create_table_entry \tbl, \virt, SWAPPER_TABLE_SHIFT, PTRS_PER_PTE, \tmp1, \tmp2
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#endif
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.endm
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@ -305,15 +284,15 @@ ENDPROC(preserve_boot_args)
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* Corrupts: phys, start, end, pstate
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*/
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.macro create_block_map, tbl, flags, phys, start, end
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lsr \phys, \phys, #BLOCK_SHIFT
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lsr \start, \start, #BLOCK_SHIFT
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lsr \phys, \phys, #SWAPPER_BLOCK_SHIFT
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lsr \start, \start, #SWAPPER_BLOCK_SHIFT
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and \start, \start, #PTRS_PER_PTE - 1 // table index
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orr \phys, \flags, \phys, lsl #BLOCK_SHIFT // table entry
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lsr \end, \end, #BLOCK_SHIFT
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orr \phys, \flags, \phys, lsl #SWAPPER_BLOCK_SHIFT // table entry
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lsr \end, \end, #SWAPPER_BLOCK_SHIFT
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and \end, \end, #PTRS_PER_PTE - 1 // table end index
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9999: str \phys, [\tbl, \start, lsl #3] // store the entry
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add \start, \start, #1 // next entry
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add \phys, \phys, #BLOCK_SIZE // next block
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add \phys, \phys, #SWAPPER_BLOCK_SIZE // next block
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cmp \start, \end
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b.ls 9999b
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.endm
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@ -350,7 +329,7 @@ __create_page_tables:
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cmp x0, x6
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b.lo 1b
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ldr x7, =MM_MMUFLAGS
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ldr x7, =SWAPPER_MM_MMUFLAGS
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/*
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* Create the identity mapping.
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@ -5,6 +5,7 @@
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/thread_info.h>
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#include <asm/memory.h>
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#include <asm/page.h>
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