/*
 * Based on arch/arm/mm/init.c
 *
 * Copyright (C) 1995-2005 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/of_fdt.h>
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/efi.h>

#include <asm/fixmap.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include "mm.h"

phys_addr_t memstart_addr __read_mostly = 0;

#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
{
        unsigned long start, size;
        char *endp;

        start = memparse(p, &endp);
        if (*endp == ',') {
                size = memparse(endp + 1, NULL);

                initrd_start = (unsigned long)__va(start);
                initrd_end = (unsigned long)__va(start + size);
        }
        return 0;
}
early_param("initrd", early_initrd);
#endif

/*
 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
 * currently assumes that for memory starting above 4G, 32-bit devices will
 * use a DMA offset.
 */
static phys_addr_t max_zone_dma_phys(void)
{
        phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
        return min(offset + (1ULL << 32), memblock_end_of_DRAM());
}

static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
        struct memblock_region *reg;
        unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
        unsigned long max_dma = min;

        memset(zone_size, 0, sizeof(zone_size));

        /* 4GB maximum for 32-bit only capable devices */
        if (IS_ENABLED(CONFIG_ZONE_DMA)) {
                max_dma = PFN_DOWN(max_zone_dma_phys());
                zone_size[ZONE_DMA] = max_dma - min;
        }
        zone_size[ZONE_NORMAL] = max - max_dma;

        memcpy(zhole_size, zone_size, sizeof(zhole_size));

        for_each_memblock(memory, reg) {
                unsigned long start = memblock_region_memory_base_pfn(reg);
                unsigned long end = memblock_region_memory_end_pfn(reg);

                if (start >= max)
                        continue;

                if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
                        unsigned long dma_end = min(end, max_dma);
                        zhole_size[ZONE_DMA] -= dma_end - start;
                }

                if (end > max_dma) {
                        unsigned long normal_end = min(end, max);
                        unsigned long normal_start = max(start, max_dma);
                        zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
                }
        }

        free_area_init_node(0, zone_size, min, zhole_size);
}

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
        return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void arm64_memory_present(void)
{
}
#else
static void arm64_memory_present(void)
{
        struct memblock_region *reg;

        for_each_memblock(memory, reg)
                memory_present(0, memblock_region_memory_base_pfn(reg),
                               memblock_region_memory_end_pfn(reg));
}
#endif

void __init arm64_memblock_init(void)
{
        phys_addr_t dma_phys_limit = 0;

        /*
         * Register the kernel text, kernel data, initrd, and initial
         * pagetables with memblock.
         */
        memblock_reserve(__pa(_text), _end - _text);
#ifdef CONFIG_BLK_DEV_INITRD
        if (initrd_start)
                memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
#endif

        early_init_fdt_scan_reserved_mem();

        /* 4GB maximum for 32-bit only capable devices */
        if (IS_ENABLED(CONFIG_ZONE_DMA))
                dma_phys_limit = max_zone_dma_phys();
        dma_contiguous_reserve(dma_phys_limit);

        memblock_allow_resize();
        memblock_dump_all();
}

void __init bootmem_init(void)
{
        unsigned long min, max;

        min = PFN_UP(memblock_start_of_DRAM());
        max = PFN_DOWN(memblock_end_of_DRAM());

        /*
         * Sparsemem tries to allocate bootmem in memory_present(), so must be
         * done after the fixed reservations.
         */
        arm64_memory_present();

        sparse_init();
        zone_sizes_init(min, max);

        high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
        max_pfn = max_low_pfn = max;
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
{
        struct page *start_pg, *end_pg;
        unsigned long pg, pgend;

        /*
         * Convert start_pfn/end_pfn to a struct page pointer.
         */
        start_pg = pfn_to_page(start_pfn - 1) + 1;
        end_pg = pfn_to_page(end_pfn - 1) + 1;

        /*
         * Convert to physical addresses, and round start upwards and end
         * downwards.
         */
        pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
        pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;

        /*
         * If there are free pages between these, free the section of the
         * memmap array.
         */
        if (pg < pgend)
                free_bootmem(pg, pgend - pg);
}

/*
 * The mem_map array can get very big. Free the unused area of the memory map.
 */
static void __init free_unused_memmap(void)
{
        unsigned long start, prev_end = 0;
        struct memblock_region *reg;

        for_each_memblock(memory, reg) {
                start = __phys_to_pfn(reg->base);

#ifdef CONFIG_SPARSEMEM
                /*
                 * Take care not to free memmap entries that don't exist due
                 * to SPARSEMEM sections which aren't present.
                 */
                start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
                /*
                 * If we had a previous bank, and there is a space between the
                 * current bank and the previous, free it.
                 */
                if (prev_end && prev_end < start)
                        free_memmap(prev_end, start);

                /*
                 * Align up here since the VM subsystem insists that the
                 * memmap entries are valid from the bank end aligned to
                 * MAX_ORDER_NR_PAGES.
                 */
                prev_end = ALIGN(start + __phys_to_pfn(reg->size),
                                 MAX_ORDER_NR_PAGES);
        }

#ifdef CONFIG_SPARSEMEM
        if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
                free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
}
#endif  /* !CONFIG_SPARSEMEM_VMEMMAP */

/*
 * mem_init() marks the free areas in the mem_map and tells us how much memory
 * is free.  This is done after various parts of the system have claimed their
 * memory after the kernel image.
 */
void __init mem_init(void)
{
        max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

#ifndef CONFIG_SPARSEMEM_VMEMMAP
        free_unused_memmap();
#endif
        /* this will put all unused low memory onto the freelists */
        free_all_bootmem();

        mem_init_print_info(NULL);

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLG(b, t) b, t, ((t) - (b)) >> 30
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

        pr_notice("Virtual kernel memory layout:\n"
                  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
                  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
                  "              0x%16lx - 0x%16lx   (%6ld MB actual)\n"
#endif
                  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
                  "    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n"
                  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
                  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
                  "      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n"
                  "      .text : 0x%p" " - 0x%p" "   (%6ld KB)\n"
                  "      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
                  MLG(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
                  MLG((unsigned long)vmemmap,
                      (unsigned long)vmemmap + VMEMMAP_SIZE),
                  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
                      (unsigned long)virt_to_page(high_memory)),
#endif
                  MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
                  MLK(FIXADDR_START, FIXADDR_TOP),
                  MLM(MODULES_VADDR, MODULES_END),
                  MLM(PAGE_OFFSET, (unsigned long)high_memory),
                  MLK_ROUNDUP(__init_begin, __init_end),
                  MLK_ROUNDUP(_text, _etext),
                  MLK_ROUNDUP(_sdata, _edata));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

        /*
         * Check boundaries twice: Some fundamental inconsistencies can be
         * detected at build time already.
         */
#ifdef CONFIG_COMPAT
        BUILD_BUG_ON(TASK_SIZE_32                       > TASK_SIZE_64);
#endif
        BUILD_BUG_ON(TASK_SIZE_64                       > MODULES_VADDR);
        BUG_ON(TASK_SIZE_64                             > MODULES_VADDR);

        if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
                extern int sysctl_overcommit_memory;
                /*
                 * On a machine this small we won't get anywhere without
                 * overcommit, so turn it on by default.
                 */
                sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
        }
}

void free_initmem(void)
{
        free_initmem_default(0);
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
        if (!keep_initrd)
                free_reserved_area((void *)start, (void *)end, 0, "initrd");
}

static int __init keepinitrd_setup(char *__unused)
{
        keep_initrd = 1;
        return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif