381 lines
10 KiB
C
381 lines
10 KiB
C
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/*
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* arch/arm/include/asm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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* modification for nommu, Hyok S. Choi, 2004
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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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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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#include <linux/compiler.h>
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#include <linux/const.h>
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#include <linux/types.h>
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#include <linux/sizes.h>
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#ifdef CONFIG_NEED_MACH_MEMORY_H
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#include <mach/memory.h>
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#endif
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/*
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* Allow for constants defined here to be used from assembly code
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* by prepending the UL suffix only with actual C code compilation.
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*/
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#define UL(x) _AC(x, UL)
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/* PAGE_OFFSET - the virtual address of the start of the kernel image */
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#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
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#ifdef CONFIG_MMU
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/*
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* TASK_SIZE - the maximum size of a user space task.
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
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*/
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#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
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#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
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/*
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* The maximum size of a 26-bit user space task.
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*/
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#define TASK_SIZE_26 (UL(1) << 26)
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#ifndef CONFIG_THUMB2_KERNEL
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#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
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#else
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/* smaller range for Thumb-2 symbols relocation (2^24)*/
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#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
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#endif
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#if TASK_SIZE > MODULES_VADDR
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#error Top of user space clashes with start of module space
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#endif
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/*
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* The highmem pkmap virtual space shares the end of the module area.
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*/
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#ifdef CONFIG_HIGHMEM
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#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
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#else
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#define MODULES_END (PAGE_OFFSET)
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#endif
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/*
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* The XIP kernel gets mapped at the bottom of the module vm area.
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* Since we use sections to map it, this macro replaces the physical address
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* with its virtual address while keeping offset from the base section.
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*/
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#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
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#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
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/*
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* Allow 16MB-aligned ioremap pages
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*/
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#define IOREMAP_MAX_ORDER 24
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#endif
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#define VECTORS_BASE UL(0xffff0000)
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#else /* CONFIG_MMU */
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#ifndef __ASSEMBLY__
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extern unsigned long vectors_base;
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#define VECTORS_BASE vectors_base
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#endif
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/*
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* The limitation of user task size can grow up to the end of free ram region.
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* It is difficult to define and perhaps will never meet the original meaning
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* of this define that was meant to.
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* Fortunately, there is no reference for this in noMMU mode, for now.
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*/
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#define TASK_SIZE UL(0xffffffff)
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#ifndef TASK_UNMAPPED_BASE
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#define TASK_UNMAPPED_BASE UL(0x00000000)
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#endif
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#ifndef END_MEM
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#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
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#endif
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/*
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* The module can be at any place in ram in nommu mode.
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*/
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#define MODULES_END (END_MEM)
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#define MODULES_VADDR PAGE_OFFSET
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#define XIP_VIRT_ADDR(physaddr) (physaddr)
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#endif /* !CONFIG_MMU */
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#ifdef CONFIG_XIP_KERNEL
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#define KERNEL_START _sdata
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#else
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#define KERNEL_START _stext
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#endif
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#define KERNEL_END _end
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/*
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* We fix the TCM memories max 32 KiB ITCM resp DTCM at these
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* locations
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*/
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#ifdef CONFIG_HAVE_TCM
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#define ITCM_OFFSET UL(0xfffe0000)
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#define DTCM_OFFSET UL(0xfffe8000)
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#endif
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/*
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* Convert a page to/from a physical address
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*/
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#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
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#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
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/*
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* PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
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* memory. This is used for XIP and NoMMU kernels, and on platforms that don't
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* have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
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* PLAT_PHYS_OFFSET and not PHYS_OFFSET.
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*/
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#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
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#ifdef CONFIG_XIP_KERNEL
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/*
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* When referencing data in RAM from the XIP region in a relative manner
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* with the MMU off, we need the relative offset between the two physical
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* addresses. The macro below achieves this, which is:
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* __pa(v_data) - __xip_pa(v_text)
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*/
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#define PHYS_RELATIVE(v_data, v_text) \
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(((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
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((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
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CONFIG_XIP_PHYS_ADDR))
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#else
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#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
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#endif
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#ifndef __ASSEMBLY__
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/*
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* Physical vs virtual RAM address space conversion. These are
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* private definitions which should NOT be used outside memory.h
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* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
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*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*/
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#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
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/*
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* Constants used to force the right instruction encodings and shifts
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* so that all we need to do is modify the 8-bit constant field.
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*/
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#define __PV_BITS_31_24 0x81000000
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#define __PV_BITS_7_0 0x81
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extern unsigned long __pv_phys_pfn_offset;
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extern u64 __pv_offset;
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extern void fixup_pv_table(const void *, unsigned long);
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extern const void *__pv_table_begin, *__pv_table_end;
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#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
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#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
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#define __pv_stub(from,to,instr,type) \
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__asm__("@ __pv_stub\n" \
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"1: " instr " %0, %1, %2\n" \
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" .pushsection .pv_table,\"a\"\n" \
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" .long 1b\n" \
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" .popsection\n" \
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: "=r" (to) \
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: "r" (from), "I" (type))
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#define __pv_stub_mov_hi(t) \
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__asm__ volatile("@ __pv_stub_mov\n" \
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"1: mov %R0, %1\n" \
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" .pushsection .pv_table,\"a\"\n" \
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" .long 1b\n" \
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" .popsection\n" \
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: "=r" (t) \
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: "I" (__PV_BITS_7_0))
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#define __pv_add_carry_stub(x, y) \
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__asm__ volatile("@ __pv_add_carry_stub\n" \
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"1: adds %Q0, %1, %2\n" \
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" adc %R0, %R0, #0\n" \
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" .pushsection .pv_table,\"a\"\n" \
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" .long 1b\n" \
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" .popsection\n" \
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: "+r" (y) \
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: "r" (x), "I" (__PV_BITS_31_24) \
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: "cc")
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static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
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{
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phys_addr_t t;
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if (sizeof(phys_addr_t) == 4) {
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__pv_stub(x, t, "add", __PV_BITS_31_24);
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} else {
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__pv_stub_mov_hi(t);
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__pv_add_carry_stub(x, t);
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}
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return t;
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}
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static inline unsigned long __phys_to_virt(phys_addr_t x)
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{
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unsigned long t;
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/*
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* 'unsigned long' cast discard upper word when
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* phys_addr_t is 64 bit, and makes sure that inline
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* assembler expression receives 32 bit argument
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* in place where 'r' 32 bit operand is expected.
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*/
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__pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
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return t;
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}
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#else
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#define PHYS_OFFSET PLAT_PHYS_OFFSET
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#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
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static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
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{
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return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
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}
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static inline unsigned long __phys_to_virt(phys_addr_t x)
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{
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return x - PHYS_OFFSET + PAGE_OFFSET;
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}
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#endif
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#define virt_to_pfn(kaddr) \
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((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
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PHYS_PFN_OFFSET)
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#define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
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#ifdef CONFIG_DEBUG_VIRTUAL
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extern phys_addr_t __virt_to_phys(unsigned long x);
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extern phys_addr_t __phys_addr_symbol(unsigned long x);
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#else
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#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
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#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
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#endif
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/*
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* These are *only* valid on the kernel direct mapped RAM memory.
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* Note: Drivers should NOT use these. They are the wrong
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* translation for translating DMA addresses. Use the driver
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* DMA support - see dma-mapping.h.
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*/
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#define virt_to_phys virt_to_phys
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static inline phys_addr_t virt_to_phys(const volatile void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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#define phys_to_virt phys_to_virt
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static inline void *phys_to_virt(phys_addr_t x)
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{
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return (void *)__phys_to_virt(x);
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}
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/*
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* Drivers should NOT use these either.
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*/
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
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#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
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#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
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extern long long arch_phys_to_idmap_offset;
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/*
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* These are for systems that have a hardware interconnect supported alias
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* of physical memory for idmap purposes. Most cases should leave these
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* untouched. Note: this can only return addresses less than 4GiB.
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*/
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static inline bool arm_has_idmap_alias(void)
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{
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return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
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}
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#define IDMAP_INVALID_ADDR ((u32)~0)
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static inline unsigned long phys_to_idmap(phys_addr_t addr)
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{
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if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
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addr += arch_phys_to_idmap_offset;
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if (addr > (u32)~0)
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addr = IDMAP_INVALID_ADDR;
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}
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return addr;
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}
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static inline phys_addr_t idmap_to_phys(unsigned long idmap)
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{
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phys_addr_t addr = idmap;
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if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
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addr -= arch_phys_to_idmap_offset;
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return addr;
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}
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static inline unsigned long __virt_to_idmap(unsigned long x)
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{
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return phys_to_idmap(__virt_to_phys(x));
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}
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#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
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/*
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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *deprecated* (and that doesn't mean
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* use the __ prefixed forms instead.) See dma-mapping.h.
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*/
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#ifndef __virt_to_bus
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#define __virt_to_bus __virt_to_phys
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#define __bus_to_virt __phys_to_virt
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#define __pfn_to_bus(x) __pfn_to_phys(x)
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#define __bus_to_pfn(x) __phys_to_pfn(x)
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#endif
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/*
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* Conversion between a struct page and a physical address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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*
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||
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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||
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* virt_addr_valid(k) indicates whether a virtual address is valid
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||
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*/
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||
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#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
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||
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||
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#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
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||
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#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
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||
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&& pfn_valid(virt_to_pfn(kaddr)))
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||
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||
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#endif
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||
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||
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#include <asm-generic/memory_model.h>
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||
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||
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#endif
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