bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-04-24 14:07:52 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
bianbu-linux-6.6/arch/arm/include/asm/memory.h
Linus Walleij a91da54570 ARM: 9089/1: Define kernel physical section start and end 
When we are mapping the initial sections in head.S we
know very well where the start and end of the kernel image
in physical memory is placed. Later on it gets hard
to determine this.

Save the information into two variables named
kernel_sec_start and kernel_sec_end for convenience
for later work involving the physical start and end
of the kernel. These variables are section-aligned
corresponding to the early section mappings set up
in head.S.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2021-06-13 18:16:41 +01:00

403 lines
11 KiB
C
Raw Blame History

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* arch/arm/include/asm/memory.h
*
* Copyright (C) 2000-2002 Russell King
* modification for nommu, Hyok S. Choi, 2004
*
* 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
#include <asm/kasan_def.h>
/*
* PAGE_OFFSET: the virtual address of the start of lowmem, memory above
* the virtual address range for userspace.
* KERNEL_OFFSET: the virtual address of the start of the kernel image.
* we may further offset this with TEXT_OFFSET in practice.
*/
#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
#define KERNEL_OFFSET (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
*/
#ifndef CONFIG_KASAN
#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
#else
#define TASK_SIZE (KASAN_SHADOW_START)
#endif
#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))
#define FDT_FIXED_BASE UL(0xff800000)
#define FDT_FIXED_SIZE (2 * SECTION_SIZE)
#define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))
#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 setup_vectors_base(void);
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)
#define FDT_VIRT_BASE(physbase) ((void *)(physbase))
#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)
#ifndef __ASSEMBLY__
/*
* Physical start and end address of the kernel sections. These addresses are
* 2MB-aligned to match the section mappings placed over the kernel.
*/
extern phys_addr_t kernel_sec_start;
extern phys_addr_t kernel_sec_end;
/*
* 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_23_16 0x810000
#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)
#ifndef CONFIG_THUMB2_KERNEL
#define __pv_stub(from,to,instr) \
__asm__("@ __pv_stub\n" \
"1: " instr " %0, %1, %2\n" \
"2: " instr " %0, %0, %3\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 1b - ., 2b - .\n" \
" .popsection\n" \
: "=r" (to) \
: "r" (from), "I" (__PV_BITS_31_24), \
"I"(__PV_BITS_23_16))
#define __pv_add_carry_stub(x, y) \
__asm__("@ __pv_add_carry_stub\n" \
"0: movw %R0, #0\n" \
" adds %Q0, %1, %R0, lsl #20\n" \
"1: mov %R0, %2\n" \
" adc %R0, %R0, #0\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 0b - ., 1b - .\n" \
" .popsection\n" \
: "=&r" (y) \
: "r" (x), "I" (__PV_BITS_7_0) \
: "cc")
#else
#define __pv_stub(from,to,instr) \
__asm__("@ __pv_stub\n" \
"0: movw %0, #0\n" \
" lsl %0, #21\n" \
" " instr " %0, %1, %0\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 0b - .\n" \
" .popsection\n" \
: "=&r" (to) \
: "r" (from))
#define __pv_add_carry_stub(x, y) \
__asm__("@ __pv_add_carry_stub\n" \
"0: movw %R0, #0\n" \
" lsls %R0, #21\n" \
" adds %Q0, %1, %R0\n" \
"1: mvn %R0, #0\n" \
" adc %R0, %R0, #0\n" \
" .pushsection .pv_table,\"a\"\n" \
" .long 0b - ., 1b - .\n" \
" .popsection\n" \
: "=&r" (y) \
: "r" (x) \
: "cc")
#endif
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");
} else {
__pv_add_carry_stub(x, t);
}
return t;
}
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");
return t;
}
#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;
}
static inline unsigned long __phys_to_virt(phys_addr_t x)
{
return x - PHYS_OFFSET + PAGE_OFFSET;
}
#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));
}
#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(phys_addr_t x)
{
return (void *)__phys_to_virt(x);
}
/*
* 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;
}
#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;
}
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;
}
static inline unsigned long __virt_to_idmap(unsigned long x)
{
return phys_to_idmap(__virt_to_phys(x));
}
#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
Reference in a new issue View git blame Copy permalink