// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/unicore32/mm/init.c
 *
 *  Copyright (C) 2010 GUAN Xue-tao
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/highmem.h>
#include <linux/gfp.h>
#include <linux/sort.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>

#include <asm/sections.h>
#include <asm/setup.h>
#include <linux/sizes.h>
#include <asm/tlb.h>
#include <asm/memblock.h>
#include <mach/map.h>

#include "mm.h"

/*
 * This keeps memory configuration data used by a couple memory
 * initialization functions, as well as show_mem() for the skipping
 * of holes in the memory map.  It is populated by uc32_add_memory().
 */
struct meminfo meminfo;

static void __init find_limits(unsigned long *min, unsigned long *max_low,
        unsigned long *max_high)
{
        struct meminfo *mi = &meminfo;
        int i;

        *min = -1UL;
        *max_low = *max_high = 0;

        for_each_bank(i, mi) {
                struct membank *bank = &mi->bank[i];
                unsigned long start, end;

                start = bank_pfn_start(bank);
                end = bank_pfn_end(bank);

                if (*min > start)
                        *min = start;
                if (*max_high < end)
                        *max_high = end;
                if (bank->highmem)
                        continue;
                if (*max_low < end)
                        *max_low = end;
        }
}

static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
        unsigned long max_high)
{
        unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
        struct memblock_region *reg;

        /*
         * initialise the zones.
         */
        memset(zone_size, 0, sizeof(zone_size));

        /*
         * The memory size has already been determined.  If we need
         * to do anything fancy with the allocation of this memory
         * to the zones, now is the time to do it.
         */
        zone_size[0] = max_low - min;

        /*
         * Calculate the size of the holes.
         *  holes = node_size - sum(bank_sizes)
         */
        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_low) {
                        unsigned long low_end = min(end, max_low);
                        zhole_size[0] -= low_end - start;
                }
        }

        /*
         * Adjust the sizes according to any special requirements for
         * this machine type.
         */
        arch_adjust_zones(zone_size, zhole_size);

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

int pfn_valid(unsigned long pfn)
{
        return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);

static void uc32_memory_present(void)
{
}

static int __init meminfo_cmp(const void *_a, const void *_b)
{
        const struct membank *a = _a, *b = _b;
        long cmp = bank_pfn_start(a) - bank_pfn_start(b);
        return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
}

void __init uc32_memblock_init(struct meminfo *mi)
{
        int i;

        sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
                meminfo_cmp, NULL);

        for (i = 0; i < mi->nr_banks; i++)
                memblock_add(mi->bank[i].start, mi->bank[i].size);

        /* Register the kernel text, kernel data and initrd with memblock. */
        memblock_reserve(__pa(_text), _end - _text);

#ifdef CONFIG_BLK_DEV_INITRD
        if (!phys_initrd_size) {
                phys_initrd_start = 0x01000000;
                phys_initrd_size = SZ_8M;
        }

        if (phys_initrd_size) {
                memblock_reserve(phys_initrd_start, phys_initrd_size);

                /* Now convert initrd to virtual addresses */
                initrd_start = __phys_to_virt(phys_initrd_start);
                initrd_end = initrd_start + phys_initrd_size;
        }
#endif

        uc32_mm_memblock_reserve();

        memblock_allow_resize();
        memblock_dump_all();
}

void __init bootmem_init(void)
{
        unsigned long min, max_low, max_high;

        max_low = max_high = 0;

        find_limits(&min, &max_low, &max_high);

        node_set_online(0);

        /*
         * Sparsemem tries to allocate bootmem in memory_present(),
         * so must be done after the fixed reservations
         */
        uc32_memory_present();

        /*
         * sparse_init() needs the bootmem allocator up and running.
         */
        sparse_init();

        /*
         * Now free the memory - free_area_init_node needs
         * the sparse mem_map arrays initialized by sparse_init()
         * for memmap_init_zone(), otherwise all PFNs are invalid.
         */
        uc32_bootmem_free(min, max_low, max_high);

        high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;

        /*
         * This doesn't seem to be used by the Linux memory manager any
         * more, but is used by ll_rw_block.  If we can get rid of it, we
         * also get rid of some of the stuff above as well.
         *
         * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
         * the system, not the maximum PFN.
         */
        max_low_pfn = max_low - PHYS_PFN_OFFSET;
        max_pfn = max_high - PHYS_PFN_OFFSET;
}

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);

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

        /*
         * If there are free pages between these,
         * free the section of the memmap array.
         */
        if (pg < pgend)
                memblock_free(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(struct meminfo *mi)
{
        unsigned long bank_start, prev_bank_end = 0;
        unsigned int i;

        /*
         * This relies on each bank being in address order.
         * The banks are sorted previously in bootmem_init().
         */
        for_each_bank(i, mi) {
                struct membank *bank = &mi->bank[i];

                bank_start = bank_pfn_start(bank);

                /*
                 * If we had a previous bank, and there is a space
                 * between the current bank and the previous, free it.
                 */
                if (prev_bank_end && prev_bank_end < bank_start)
                        free_memmap(prev_bank_end, bank_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_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
        }
}

/*
 * 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;

        free_unused_memmap(&meminfo);

        /* this will put all unused low memory onto the freelists */
        memblock_free_all();

        mem_init_print_info(NULL);

        BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
        BUG_ON(TASK_SIZE                                > MODULES_VADDR);

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