/* 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 explicitly, include <asm/page.h>
 *  to get access to these definitions.
 */
#ifndef __ASM_ARM_MEMORY_H
#define __ASM_ARM_MEMORY_H

#ifndef _ASMARM_PAGE_H
#error "Do not include <asm/memory.h> directly"
#endif

#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

/*
 * 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. We use
 * u64 so that LPAE mappings beyond the 32bit limit will work out as well.
 */
extern u64 kernel_sec_start;
extern u64 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

static inline unsigned long virt_to_pfn(const void *p)
{
        unsigned long kaddr = (unsigned long)p;
        return (((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))

/*
 * 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

#endif