Release 4.11 arch/arm/include/asm/memory.h
/*
* arch/arm/include/asm/memory.h
*
* Copyright (C) 2000-2002 Russell King
* modification for nommu, Hyok S. Choi, 2004
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Note: this file should not be included by non-asm/.h files
*/
#ifndef __ASM_ARM_MEMORY_H
#define __ASM_ARM_MEMORY_H
#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>
#include <linux/sizes.h>
#ifdef CONFIG_NEED_MACH_MEMORY_H
#include <mach/memory.h>
#endif
/*
* Allow for constants defined here to be used from assembly code
* by prepending the UL suffix only with actual C code compilation.
*/
#define UL(x) _AC(x, UL)
/* PAGE_OFFSET - the virtual address of the start of the kernel image */
#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
#ifdef CONFIG_MMU
/*
* TASK_SIZE - the maximum size of a user space task.
* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
*/
#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
/*
* The maximum size of a 26-bit user space task.
*/
#define TASK_SIZE_26 (UL(1) << 26)
/*
* The module space lives between the addresses given by TASK_SIZE
* and PAGE_OFFSET - it must be within 32MB of the kernel text.
*/
#ifndef CONFIG_THUMB2_KERNEL
#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
#else
/* smaller range for Thumb-2 symbols relocation (2^24)*/
#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
#endif
#if TASK_SIZE > MODULES_VADDR
#error Top of user space clashes with start of module space
#endif
/*
* The highmem pkmap virtual space shares the end of the module area.
*/
#ifdef CONFIG_HIGHMEM
#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
#else
#define MODULES_END (PAGE_OFFSET)
#endif
/*
* The XIP kernel gets mapped at the bottom of the module vm area.
* Since we use sections to map it, this macro replaces the physical address
* with its virtual address while keeping offset from the base section.
*/
#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
/*
* Allow 16MB-aligned ioremap pages
*/
#define IOREMAP_MAX_ORDER 24
#endif
#define VECTORS_BASE UL(0xffff0000)
#else /* CONFIG_MMU */
#ifndef __ASSEMBLY__
extern unsigned long vectors_base;
#define VECTORS_BASE vectors_base
#endif
/*
* The limitation of user task size can grow up to the end of free ram region.
* It is difficult to define and perhaps will never meet the original meaning
* of this define that was meant to.
* Fortunately, there is no reference for this in noMMU mode, for now.
*/
#define TASK_SIZE UL(0xffffffff)
#ifndef TASK_UNMAPPED_BASE
#define TASK_UNMAPPED_BASE UL(0x00000000)
#endif
#ifndef END_MEM
#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
#endif
/*
* The module can be at any place in ram in nommu mode.
*/
#define MODULES_END (END_MEM)
#define MODULES_VADDR PAGE_OFFSET
#define XIP_VIRT_ADDR(physaddr) (physaddr)
#endif /* !CONFIG_MMU */
#ifdef CONFIG_XIP_KERNEL
#define KERNEL_START _sdata
#else
#define KERNEL_START _stext
#endif
#define KERNEL_END _end
/*
* We fix the TCM memories max 32 KiB ITCM resp DTCM at these
* locations
*/
#ifdef CONFIG_HAVE_TCM
#define ITCM_OFFSET UL(0xfffe0000)
#define DTCM_OFFSET UL(0xfffe8000)
#endif
/*
* Convert a page to/from a physical address
*/
#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
/*
* PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
* memory. This is used for XIP and NoMMU kernels, and on platforms that don't
* have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
* PLAT_PHYS_OFFSET and not PHYS_OFFSET.
*/
#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
#ifdef CONFIG_XIP_KERNEL
/*
* When referencing data in RAM from the XIP region in a relative manner
* with the MMU off, we need the relative offset between the two physical
* addresses. The macro below achieves this, which is:
* __pa(v_data) - __xip_pa(v_text)
*/
#define PHYS_RELATIVE(v_data, v_text) \
(((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
CONFIG_XIP_PHYS_ADDR))
#else
#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
#endif
#ifndef __ASSEMBLY__
/*
* Physical vs virtual RAM address space conversion. These are
* private definitions which should NOT be used outside memory.h
* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
*
* PFNs are used to describe any physical page; this means
* PFN 0 == physical address 0.
*/
#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
/*
* Constants used to force the right instruction encodings and shifts
* so that all we need to do is modify the 8-bit constant field.
*/
#define __PV_BITS_31_24 0x81000000
#define __PV_BITS_7_0 0x81
extern unsigned long __pv_phys_pfn_offset;
extern u64 __pv_offset;
extern void fixup_pv_table(const void *, unsigned long);
extern const void *__pv_table_begin, *__pv_table_end;
#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
#define __pv_stub(from,to,instr,type) \
__asm__("@ __pv_stub\n" \
"1: " instr " %0, %1, %2\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 1b\n" \
" .popsection\n" \
: "=r" (to) \
: "r" (from), "I" (type))
#define __pv_stub_mov_hi(t) \
__asm__ volatile("@ __pv_stub_mov\n" \
"1: mov %R0, %1\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 1b\n" \
" .popsection\n" \
: "=r" (t) \
: "I" (__PV_BITS_7_0))
#define __pv_add_carry_stub(x, y) \
__asm__ volatile("@ __pv_add_carry_stub\n" \
"1: adds %Q0, %1, %2\n" \
" adc %R0, %R0, #0\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 1b\n" \
" .popsection\n" \
: "+r" (y) \
: "r" (x), "I" (__PV_BITS_31_24) \
: "cc")
static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
{
phys_addr_t t;
if (sizeof(phys_addr_t) == 4) {
__pv_stub(x, t, "add", __PV_BITS_31_24);
} else {
__pv_stub_mov_hi(t);
__pv_add_carry_stub(x, t);
}
return t;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| R Sricharan | 27 | 50.00% | 1 | 20.00% |
| Russell King | 25 | 46.30% | 2 | 40.00% |
| Florian Fainelli | 1 | 1.85% | 1 | 20.00% |
| Santosh Shilimkar | 1 | 1.85% | 1 | 20.00% |
| Total | 54 | 100.00% | 5 | 100.00% |
static inline unsigned long __phys_to_virt(phys_addr_t x)
{
unsigned long t;
/*
* 'unsigned long' cast discard upper word when
* phys_addr_t is 64 bit, and makes sure that inline
* assembler expression receives 32 bit argument
* in place where 'r' 32 bit operand is expected.
*/
__pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
return t;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 28 | 82.35% | 2 | 50.00% |
| Victor Kamensky | 5 | 14.71% | 1 | 25.00% |
| Santosh Shilimkar | 1 | 2.94% | 1 | 25.00% |
| Total | 34 | 100.00% | 4 | 100.00% |
#else
#define PHYS_OFFSET PLAT_PHYS_OFFSET
#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
{
return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Santosh Shilimkar | 17 | 80.95% | 1 | 33.33% |
| Russell King | 3 | 14.29% | 1 | 33.33% |
| Florian Fainelli | 1 | 4.76% | 1 | 33.33% |
| Total | 21 | 100.00% | 3 | 100.00% |
static inline unsigned long __phys_to_virt(phys_addr_t x)
{
return x - PHYS_OFFSET + PAGE_OFFSET;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Santosh Shilimkar | 14 | 77.78% | 1 | 50.00% |
| Russell King | 4 | 22.22% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
#endif
#define virt_to_pfn(kaddr) \
((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
PHYS_PFN_OFFSET)
#define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
#ifdef CONFIG_DEBUG_VIRTUAL
extern phys_addr_t __virt_to_phys(unsigned long x);
extern phys_addr_t __phys_addr_symbol(unsigned long x);
#else
#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
#endif
/*
* These are *only* valid on the kernel direct mapped RAM memory.
* Note: Drivers should NOT use these. They are the wrong
* translation for translating DMA addresses. Use the driver
* DMA support - see dma-mapping.h.
*/
#define virt_to_phys virt_to_phys
static inline phys_addr_t virt_to_phys(const volatile void *x)
{
return __virt_to_phys((unsigned long)(x));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 20 | 80.00% | 1 | 25.00% |
| Catalin Marinas | 2 | 8.00% | 1 | 25.00% |
| Linus Torvalds | 2 | 8.00% | 1 | 25.00% |
| Will Deacon | 1 | 4.00% | 1 | 25.00% |
| Total | 25 | 100.00% | 4 | 100.00% |
#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(phys_addr_t x)
{
return (void *)__phys_to_virt(x);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 18 | 85.71% | 1 | 33.33% |
| Linus Torvalds | 2 | 9.52% | 1 | 33.33% |
| Will Deacon | 1 | 4.76% | 1 | 33.33% |
| Total | 21 | 100.00% | 3 | 100.00% |
/*
* Drivers should NOT use these either.
*/
#define __pa(x) __virt_to_phys((unsigned long)(x))
#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
extern long long arch_phys_to_idmap_offset;
/*
* These are for systems that have a hardware interconnect supported alias
* of physical memory for idmap purposes. Most cases should leave these
* untouched. Note: this can only return addresses less than 4GiB.
*/
static inline bool arm_has_idmap_alias(void)
{
return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
#define IDMAP_INVALID_ADDR ((u32)~0)
static inline unsigned long phys_to_idmap(phys_addr_t addr)
{
if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
addr += arch_phys_to_idmap_offset;
if (addr > (u32)~0)
addr = IDMAP_INVALID_ADDR;
}
return addr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 34 | 79.07% | 3 | 75.00% |
| Santosh Shilimkar | 9 | 20.93% | 1 | 25.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
static inline phys_addr_t idmap_to_phys(unsigned long idmap)
{
phys_addr_t addr = idmap;
if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
addr -= arch_phys_to_idmap_offset;
return addr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 29 | 90.62% | 1 | 50.00% |
| Santosh Shilimkar | 3 | 9.38% | 1 | 50.00% |
| Total | 32 | 100.00% | 2 | 100.00% |
static inline unsigned long __virt_to_idmap(unsigned long x)
{
return phys_to_idmap(__virt_to_phys(x));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 14 | 66.67% | 1 | 50.00% |
| Santosh Shilimkar | 7 | 33.33% | 1 | 50.00% |
| Total | 21 | 100.00% | 2 | 100.00% |
#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
/*
* Virtual <-> DMA view memory address translations
* Again, these are *only* valid on the kernel direct mapped RAM
* memory. Use of these is *deprecated* (and that doesn't mean
* use the __ prefixed forms instead.) See dma-mapping.h.
*/
#ifndef __virt_to_bus
#define __virt_to_bus __virt_to_phys
#define __bus_to_virt __phys_to_virt
#define __pfn_to_bus(x) __pfn_to_phys(x)
#define __bus_to_pfn(x) __phys_to_pfn(x)
#endif
/*
* Conversion between a struct page and a physical address.
*
* page_to_pfn(page) convert a struct page * to a PFN number
* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
*
* virt_to_page(k) convert a _valid_ virtual address to struct page *
* virt_addr_valid(k) indicates whether a virtual address is valid
*/
#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
&& pfn_valid(virt_to_pfn(kaddr)))
#endif
#include <asm-generic/memory_model.h>
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 382 | 46.42% | 24 | 39.34% |
| Florian Fainelli | 74 | 8.99% | 2 | 3.28% |
| R Sricharan | 72 | 8.75% | 1 | 1.64% |
| Santosh Shilimkar | 60 | 7.29% | 2 | 3.28% |
| Nico Pitre | 55 | 6.68% | 7 | 11.48% |
| Linus Torvalds (pre-git) | 48 | 5.83% | 1 | 1.64% |
| Afzal Mohammed | 18 | 2.19% | 1 | 1.64% |
| Lennert Buytenhek | 17 | 2.07% | 2 | 3.28% |
| Sergey Dyasly | 15 | 1.82% | 1 | 1.64% |
| Linus Walleij | 14 | 1.70% | 1 | 1.64% |
| Catalin Marinas | 13 | 1.58% | 2 | 3.28% |
| Will Deacon | 10 | 1.22% | 3 | 4.92% |
| Uwe Kleine-König | 9 | 1.09% | 3 | 4.92% |
| Thierry Reding | 8 | 0.97% | 1 | 1.64% |
| Hiroki Kaminaga | 6 | 0.73% | 1 | 1.64% |
| Victor Kamensky | 5 | 0.61% | 1 | 1.64% |
| Linus Torvalds | 4 | 0.49% | 1 | 1.64% |
| Kamezawa Hiroyuki | 4 | 0.49% | 1 | 1.64% |
| Al Viro | 3 | 0.36% | 1 | 1.64% |
| Kevin Hilman | 2 | 0.24% | 1 | 1.64% |
| Andreas Fenkart | 1 | 0.12% | 1 | 1.64% |
| Alessandro Rubini | 1 | 0.12% | 1 | 1.64% |
| Jiang Liu | 1 | 0.12% | 1 | 1.64% |
| Vitaly Andrianov | 1 | 0.12% | 1 | 1.64% |
| Total | 823 | 100.00% | 61 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.