// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Common boot and setup code for both 32-bit and 64-bit.
 * Extracted from arch/powerpc/kernel/setup_64.c.
 *
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 */

#undef DEBUG

#include <linux/export.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/percpu.h>
#include <linux/memblock.h>
#include <linux/of_platform.h>
#include <linux/hugetlb.h>
#include <asm/debugfs.h>
#include <asm/io.h>
#include <asm/paca.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/xmon.h>
#include <asm/cputhreads.h>
#include <mm/mmu_decl.h>
#include <asm/fadump.h>
#include <asm/udbg.h>
#include <asm/hugetlb.h>
#include <asm/livepatch.h>
#include <asm/mmu_context.h>
#include <asm/cpu_has_feature.h>
#include <asm/kasan.h>

#include "setup.h"

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/* The main machine-dep calls structure
 */
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);
struct machdep_calls *machine_id;
EXPORT_SYMBOL(machine_id);

int boot_cpuid = -1;
EXPORT_SYMBOL_GPL(boot_cpuid);

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;


unsigned long klimit = (unsigned long) _end;

/*
 * This still seems to be needed... -- paulus
 */ 
struct screen_info screen_info = {
        .orig_x = 0,
        .orig_y = 25,
        .orig_video_cols = 80,
        .orig_video_lines = 25,
        .orig_video_isVGA = 1,
        .orig_video_points = 16
};
#if defined(CONFIG_FB_VGA16_MODULE)
EXPORT_SYMBOL(screen_info);
#endif

/* Variables required to store legacy IO irq routing */
int of_i8042_kbd_irq;
EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
int of_i8042_aux_irq;
EXPORT_SYMBOL_GPL(of_i8042_aux_irq);

#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

#ifdef CONFIG_CRASH_CORE
/* This keeps a track of which one is the crashing cpu. */
int crashing_cpu = -1;
#endif

/* also used by kexec */
void machine_shutdown(void)
{
        /*
         * if fadump is active, cleanup the fadump registration before we
         * shutdown.
         */
        fadump_cleanup();

        if (ppc_md.machine_shutdown)
                ppc_md.machine_shutdown();
}

static void machine_hang(void)
{
        pr_emerg("System Halted, OK to turn off power\n");
        local_irq_disable();
        while (1)
                ;
}

void machine_restart(char *cmd)
{
        machine_shutdown();
        if (ppc_md.restart)
                ppc_md.restart(cmd);

        smp_send_stop();

        do_kernel_restart(cmd);
        mdelay(1000);

        machine_hang();
}

void machine_power_off(void)
{
        machine_shutdown();
        if (pm_power_off)
                pm_power_off();

        smp_send_stop();
        machine_hang();
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);

void (*pm_power_off)(void);
EXPORT_SYMBOL_GPL(pm_power_off);

void machine_halt(void)
{
        machine_shutdown();
        if (ppc_md.halt)
                ppc_md.halt();

        smp_send_stop();
        machine_hang();
}

#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, cpu_pvr);
#endif

static void show_cpuinfo_summary(struct seq_file *m)
{
        struct device_node *root;
        const char *model = NULL;
        unsigned long bogosum = 0;
        int i;

        if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
                for_each_online_cpu(i)
                        bogosum += loops_per_jiffy;
                seq_printf(m, "total bogomips\t: %lu.%02lu\n",
                           bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
        }
        seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
        if (ppc_md.name)
                seq_printf(m, "platform\t: %s\n", ppc_md.name);
        root = of_find_node_by_path("/");
        if (root)
                model = of_get_property(root, "model", NULL);
        if (model)
                seq_printf(m, "model\t\t: %s\n", model);
        of_node_put(root);

        if (ppc_md.show_cpuinfo != NULL)
                ppc_md.show_cpuinfo(m);

        /* Display the amount of memory */
        if (IS_ENABLED(CONFIG_PPC32))
                seq_printf(m, "Memory\t\t: %d MB\n",
                           (unsigned int)(total_memory / (1024 * 1024)));
}

static int show_cpuinfo(struct seq_file *m, void *v)
{
        unsigned long cpu_id = (unsigned long)v - 1;
        unsigned int pvr;
        unsigned long proc_freq;
        unsigned short maj;
        unsigned short min;

#ifdef CONFIG_SMP
        pvr = per_cpu(cpu_pvr, cpu_id);
#else
        pvr = mfspr(SPRN_PVR);
#endif
        maj = (pvr >> 8) & 0xFF;
        min = pvr & 0xFF;

        seq_printf(m, "processor\t: %lu\n", cpu_id);
        seq_printf(m, "cpu\t\t: ");

        if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
                seq_printf(m, "%s", cur_cpu_spec->cpu_name);
        else
                seq_printf(m, "unknown (%08x)", pvr);

        if (cpu_has_feature(CPU_FTR_ALTIVEC))
                seq_printf(m, ", altivec supported");

        seq_printf(m, "\n");

#ifdef CONFIG_TAU
        if (cpu_has_feature(CPU_FTR_TAU)) {
                if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
                        /* more straightforward, but potentially misleading */
                        seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
                                   cpu_temp(cpu_id));
                } else {
                        /* show the actual temp sensor range */
                        u32 temp;
                        temp = cpu_temp_both(cpu_id);
                        seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
                                   temp & 0xff, temp >> 16);
                }
        }
#endif /* CONFIG_TAU */

        /*
         * Platforms that have variable clock rates, should implement
         * the method ppc_md.get_proc_freq() that reports the clock
         * rate of a given cpu. The rest can use ppc_proc_freq to
         * report the clock rate that is same across all cpus.
         */
        if (ppc_md.get_proc_freq)
                proc_freq = ppc_md.get_proc_freq(cpu_id);
        else
                proc_freq = ppc_proc_freq;

        if (proc_freq)
                seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
                           proc_freq / 1000000, proc_freq % 1000000);

        if (ppc_md.show_percpuinfo != NULL)
                ppc_md.show_percpuinfo(m, cpu_id);

        /* If we are a Freescale core do a simple check so
         * we dont have to keep adding cases in the future */
        if (PVR_VER(pvr) & 0x8000) {
                switch (PVR_VER(pvr)) {
                case 0x8000:    /* 7441/7450/7451, Voyager */
                case 0x8001:    /* 7445/7455, Apollo 6 */
                case 0x8002:    /* 7447/7457, Apollo 7 */
                case 0x8003:    /* 7447A, Apollo 7 PM */
                case 0x8004:    /* 7448, Apollo 8 */
                case 0x800c:    /* 7410, Nitro */
                        maj = ((pvr >> 8) & 0xF);
                        min = PVR_MIN(pvr);
                        break;
                default:        /* e500/book-e */
                        maj = PVR_MAJ(pvr);
                        min = PVR_MIN(pvr);
                        break;
                }
        } else {
                switch (PVR_VER(pvr)) {
                        case 0x0020:    /* 403 family */
                                maj = PVR_MAJ(pvr) + 1;
                                min = PVR_MIN(pvr);
                                break;
                        case 0x1008:    /* 740P/750P ?? */
                                maj = ((pvr >> 8) & 0xFF) - 1;
                                min = pvr & 0xFF;
                                break;
                        case 0x004e: /* POWER9 bits 12-15 give chip type */
                                maj = (pvr >> 8) & 0x0F;
                                min = pvr & 0xFF;
                                break;
                        default:
                                maj = (pvr >> 8) & 0xFF;
                                min = pvr & 0xFF;
                                break;
                }
        }

        seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
                   maj, min, PVR_VER(pvr), PVR_REV(pvr));

        if (IS_ENABLED(CONFIG_PPC32))
                seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
                           (loops_per_jiffy / (5000 / HZ)) % 100);

        seq_printf(m, "\n");

        /* If this is the last cpu, print the summary */
        if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
                show_cpuinfo_summary(m);

        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
        if (*pos == 0)  /* just in case, cpu 0 is not the first */
                *pos = cpumask_first(cpu_online_mask);
        else
                *pos = cpumask_next(*pos - 1, cpu_online_mask);
        if ((*pos) < nr_cpu_ids)
                return (void *)(unsigned long)(*pos + 1);
        return NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
        (*pos)++;
        return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
        .start  = c_start,
        .next   = c_next,
        .stop   = c_stop,
        .show   = show_cpuinfo,
};

void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
        DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
            initrd_start, initrd_end);

        /* If we were passed an initrd, set the ROOT_DEV properly if the values
         * look sensible. If not, clear initrd reference.
         */
        if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
            initrd_end > initrd_start)
                ROOT_DEV = Root_RAM0;
        else
                initrd_start = initrd_end = 0;

        if (initrd_start)
                pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

        DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}

#ifdef CONFIG_SMP

int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
cpumask_t threads_core_mask __read_mostly;
EXPORT_SYMBOL_GPL(threads_per_core);
EXPORT_SYMBOL_GPL(threads_per_subcore);
EXPORT_SYMBOL_GPL(threads_shift);
EXPORT_SYMBOL_GPL(threads_core_mask);

static void __init cpu_init_thread_core_maps(int tpc)
{
        int i;

        threads_per_core = tpc;
        threads_per_subcore = tpc;
        cpumask_clear(&threads_core_mask);

        /* This implementation only supports power of 2 number of threads
         * for simplicity and performance
         */
        threads_shift = ilog2(tpc);
        BUG_ON(tpc != (1 << threads_shift));

        for (i = 0; i < tpc; i++)
                cpumask_set_cpu(i, &threads_core_mask);

        printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
               tpc, tpc > 1 ? "s" : "");
        printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
}


u32 *cpu_to_phys_id = NULL;

/**
 * setup_cpu_maps - initialize the following cpu maps:
 *                  cpu_possible_mask
 *                  cpu_present_mask
 *
 * Having the possible map set up early allows us to restrict allocations
 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 *
 * We do not initialize the online map here; cpus set their own bits in
 * cpu_online_mask as they come up.
 *
 * This function is valid only for Open Firmware systems.  finish_device_tree
 * must be called before using this.
 *
 * While we're here, we may as well set the "physical" cpu ids in the paca.
 *
 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 */
void __init smp_setup_cpu_maps(void)
{
        struct device_node *dn;
        int cpu = 0;
        int nthreads = 1;

        DBG("smp_setup_cpu_maps()\n");

        cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
                                        __alignof__(u32));
        if (!cpu_to_phys_id)
                panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
                      __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));

        for_each_node_by_type(dn, "cpu") {
                const __be32 *intserv;
                __be32 cpu_be;
                int j, len;

                DBG("  * %pOF...\n", dn);

                intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
                                &len);
                if (intserv) {
                        DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
                            nthreads);
                } else {
                        DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
                        intserv = of_get_property(dn, "reg", &len);
                        if (!intserv) {
                                cpu_be = cpu_to_be32(cpu);
                                /* XXX: what is this? uninitialized?? */
                                intserv = &cpu_be;      /* assume logical == phys */
                                len = 4;
                        }
                }

                nthreads = len / sizeof(int);

                for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
                        bool avail;

                        DBG("    thread %d -> cpu %d (hard id %d)\n",
                            j, cpu, be32_to_cpu(intserv[j]));

                        avail = of_device_is_available(dn);
                        if (!avail)
                                avail = !of_property_match_string(dn,
                                                "enable-method", "spin-table");

                        set_cpu_present(cpu, avail);
                        set_cpu_possible(cpu, true);
                        cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
                        cpu++;
                }

                if (cpu >= nr_cpu_ids) {
                        of_node_put(dn);
                        break;
                }
        }

        /* If no SMT supported, nthreads is forced to 1 */
        if (!cpu_has_feature(CPU_FTR_SMT)) {
                DBG("  SMT disabled ! nthreads forced to 1\n");
                nthreads = 1;
        }

#ifdef CONFIG_PPC64
        /*
         * On pSeries LPAR, we need to know how many cpus
         * could possibly be added to this partition.
         */
        if (firmware_has_feature(FW_FEATURE_LPAR) &&
            (dn = of_find_node_by_path("/rtas"))) {
                int num_addr_cell, num_size_cell, maxcpus;
                const __be32 *ireg;

                num_addr_cell = of_n_addr_cells(dn);
                num_size_cell = of_n_size_cells(dn);

                ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

                if (!ireg)
                        goto out;

                maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);

                /* Double maxcpus for processors which have SMT capability */
                if (cpu_has_feature(CPU_FTR_SMT))
                        maxcpus *= nthreads;

                if (maxcpus > nr_cpu_ids) {
                        printk(KERN_WARNING
                               "Partition configured for %d cpus, "
                               "operating system maximum is %u.\n",
                               maxcpus, nr_cpu_ids);
                        maxcpus = nr_cpu_ids;
                } else
                        printk(KERN_INFO "Partition configured for %d cpus.\n",
                               maxcpus);

                for (cpu = 0; cpu < maxcpus; cpu++)
                        set_cpu_possible(cpu, true);
        out:
                of_node_put(dn);
        }
        vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */

        /* Initialize CPU <=> thread mapping/
         *
         * WARNING: We assume that the number of threads is the same for
         * every CPU in the system. If that is not the case, then some code
         * here will have to be reworked
         */
        cpu_init_thread_core_maps(nthreads);

        /* Now that possible cpus are set, set nr_cpu_ids for later use */
        setup_nr_cpu_ids();

        free_unused_pacas();
}
#endif /* CONFIG_SMP */

#ifdef CONFIG_PCSPKR_PLATFORM
static __init int add_pcspkr(void)
{
        struct device_node *np;
        struct platform_device *pd;
        int ret;

        np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
        of_node_put(np);
        if (!np)
                return -ENODEV;

        pd = platform_device_alloc("pcspkr", -1);
        if (!pd)
                return -ENOMEM;

        ret = platform_device_add(pd);
        if (ret)
                platform_device_put(pd);

        return ret;
}
device_initcall(add_pcspkr);
#endif  /* CONFIG_PCSPKR_PLATFORM */

void probe_machine(void)
{
        extern struct machdep_calls __machine_desc_start;
        extern struct machdep_calls __machine_desc_end;
        unsigned int i;

        /*
         * Iterate all ppc_md structures until we find the proper
         * one for the current machine type
         */
        DBG("Probing machine type ...\n");

        /*
         * Check ppc_md is empty, if not we have a bug, ie, we setup an
         * entry before probe_machine() which will be overwritten
         */
        for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
                if (((void **)&ppc_md)[i]) {
                        printk(KERN_ERR "Entry %d in ppc_md non empty before"
                               " machine probe !\n", i);
                }
        }

        for (machine_id = &__machine_desc_start;
             machine_id < &__machine_desc_end;
             machine_id++) {
                DBG("  %s ...", machine_id->name);
                memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
                if (ppc_md.probe()) {
                        DBG(" match !\n");
                        break;
                }
                DBG("\n");
        }
        /* What can we do if we didn't find ? */
        if (machine_id >= &__machine_desc_end) {
                pr_err("No suitable machine description found !\n");
                for (;;);
        }

        printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
}

/* Match a class of boards, not a specific device configuration. */
int check_legacy_ioport(unsigned long base_port)
{
        struct device_node *parent, *np = NULL;
        int ret = -ENODEV;

        switch(base_port) {
        case I8042_DATA_REG:
                if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
                        np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
                if (np) {
                        parent = of_get_parent(np);

                        of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
                        if (!of_i8042_kbd_irq)
                                of_i8042_kbd_irq = 1;

                        of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
                        if (!of_i8042_aux_irq)
                                of_i8042_aux_irq = 12;

                        of_node_put(np);
                        np = parent;
                        break;
                }
                np = of_find_node_by_type(NULL, "8042");
                /* Pegasos has no device_type on its 8042 node, look for the
                 * name instead */
                if (!np)
                        np = of_find_node_by_name(NULL, "8042");
                if (np) {
                        of_i8042_kbd_irq = 1;
                        of_i8042_aux_irq = 12;
                }
                break;
        case FDC_BASE: /* FDC1 */
                np = of_find_node_by_type(NULL, "fdc");
                break;
        default:
                /* ipmi is supposed to fail here */
                break;
        }
        if (!np)
                return ret;
        parent = of_get_parent(np);
        if (parent) {
                if (of_node_is_type(parent, "isa"))
                        ret = 0;
                of_node_put(parent);
        }
        of_node_put(np);
        return ret;
}
EXPORT_SYMBOL(check_legacy_ioport);

static int ppc_panic_event(struct notifier_block *this,
                             unsigned long event, void *ptr)
{
        /*
         * panic does a local_irq_disable, but we really
         * want interrupts to be hard disabled.
         */
        hard_irq_disable();

        /*
         * If firmware-assisted dump has been registered then trigger
         * firmware-assisted dump and let firmware handle everything else.
         */
        crash_fadump(NULL, ptr);
        if (ppc_md.panic)
                ppc_md.panic(ptr);  /* May not return */
        return NOTIFY_DONE;
}

static struct notifier_block ppc_panic_block = {
        .notifier_call = ppc_panic_event,
        .priority = INT_MIN /* may not return; must be done last */
};

void __init setup_panic(void)
{
        /* PPC64 always does a hard irq disable in its panic handler */
        if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
                return;
        atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
}

#ifdef CONFIG_CHECK_CACHE_COHERENCY
/*
 * For platforms that have configurable cache-coherency.  This function
 * checks that the cache coherency setting of the kernel matches the setting
 * left by the firmware, as indicated in the device tree.  Since a mismatch
 * will eventually result in DMA failures, we print * and error and call
 * BUG() in that case.
 */

#define KERNEL_COHERENCY        (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))

static int __init check_cache_coherency(void)
{
        struct device_node *np;
        const void *prop;
        bool devtree_coherency;

        np = of_find_node_by_path("/");
        prop = of_get_property(np, "coherency-off", NULL);
        of_node_put(np);

        devtree_coherency = prop ? false : true;

        if (devtree_coherency != KERNEL_COHERENCY) {
                printk(KERN_ERR
                        "kernel coherency:%s != device tree_coherency:%s\n",
                        KERNEL_COHERENCY ? "on" : "off",
                        devtree_coherency ? "on" : "off");
                BUG();
        }

        return 0;
}

late_initcall(check_cache_coherency);
#endif /* CONFIG_CHECK_CACHE_COHERENCY */

#ifdef CONFIG_DEBUG_FS
struct dentry *powerpc_debugfs_root;
EXPORT_SYMBOL(powerpc_debugfs_root);

static int powerpc_debugfs_init(void)
{
        powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

        return powerpc_debugfs_root == NULL;
}
arch_initcall(powerpc_debugfs_init);
#endif

void ppc_printk_progress(char *s, unsigned short hex)
{
        pr_info("%s\n", s);
}

static __init void print_system_info(void)
{
        pr_info("-----------------------------------------------------\n");
        pr_info("phys_mem_size     = 0x%llx\n",
                (unsigned long long)memblock_phys_mem_size());

        pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
        pr_info("icache_bsize      = 0x%x\n", icache_bsize);
        if (ucache_bsize != 0)
                pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);

        pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
        pr_info("  possible        = 0x%016lx\n",
                (unsigned long)CPU_FTRS_POSSIBLE);
        pr_info("  always          = 0x%016lx\n",
                (unsigned long)CPU_FTRS_ALWAYS);
        pr_info("cpu_user_features = 0x%08x 0x%08x\n",
                cur_cpu_spec->cpu_user_features,
                cur_cpu_spec->cpu_user_features2);
        pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
#ifdef CONFIG_PPC64
        pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
#ifdef CONFIG_PPC_BOOK3S
        pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
        pr_info("IO start          = 0x%lx\n", KERN_IO_START);
        pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
#endif
#endif

        if (!early_radix_enabled())
                print_system_hash_info();

        if (PHYSICAL_START > 0)
                pr_info("physical_start    = 0x%llx\n",
                       (unsigned long long)PHYSICAL_START);
        pr_info("-----------------------------------------------------\n");
}

#ifdef CONFIG_SMP
static void smp_setup_pacas(void)
{
        int cpu;

        for_each_possible_cpu(cpu) {
                if (cpu == smp_processor_id())
                        continue;
                allocate_paca(cpu);
                set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
        }

        memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
        cpu_to_phys_id = NULL;
}
#endif

/*
 * Called into from start_kernel this initializes memblock, which is used
 * to manage page allocation until mem_init is called.
 */
void __init setup_arch(char **cmdline_p)
{
        kasan_init();

        *cmdline_p = boot_command_line;

        /* Set a half-reasonable default so udelay does something sensible */
        loops_per_jiffy = 500000000 / HZ;

        /* Unflatten the device-tree passed by prom_init or kexec */
        unflatten_device_tree();

        /*
         * Initialize cache line/block info from device-tree (on ppc64) or
         * just cputable (on ppc32).
         */
        initialize_cache_info();

        /* Initialize RTAS if available. */
        rtas_initialize();

        /* Check if we have an initrd provided via the device-tree. */
        check_for_initrd();

        /* Probe the machine type, establish ppc_md. */
        probe_machine();

        /* Setup panic notifier if requested by the platform. */
        setup_panic();

        /*
         * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
         * it from their respective probe() function.
         */
        setup_power_save();

        /* Discover standard serial ports. */
        find_legacy_serial_ports();

        /* Register early console with the printk subsystem. */
        register_early_udbg_console();

        /* Setup the various CPU maps based on the device-tree. */
        smp_setup_cpu_maps();

        /* Initialize xmon. */
        xmon_setup();

        /* Check the SMT related command line arguments (ppc64). */
        check_smt_enabled();

        /* Parse memory topology */
        mem_topology_setup();

        /*
         * Release secondary cpus out of their spinloops at 0x60 now that
         * we can map physical -> logical CPU ids.
         *
         * Freescale Book3e parts spin in a loop provided by firmware,
         * so smp_release_cpus() does nothing for them.
         */
#ifdef CONFIG_SMP
        smp_setup_pacas();

        /* On BookE, setup per-core TLB data structures. */
        setup_tlb_core_data();

        smp_release_cpus();
#endif

        /* Print various info about the machine that has been gathered so far. */
        print_system_info();

        /* Reserve large chunks of memory for use by CMA for KVM. */
        kvm_cma_reserve();

        klp_init_thread_info(&init_task);

        init_mm.start_code = (unsigned long)_stext;
        init_mm.end_code = (unsigned long) _etext;
        init_mm.end_data = (unsigned long) _edata;
        init_mm.brk = klimit;

        mm_iommu_init(&init_mm);
        irqstack_early_init();
        exc_lvl_early_init();
        emergency_stack_init();

        initmem_init();

        early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);

        if (IS_ENABLED(CONFIG_DUMMY_CONSOLE))
                conswitchp = &dummy_con;

        if (ppc_md.setup_arch)
                ppc_md.setup_arch();

        setup_barrier_nospec();
        setup_spectre_v2();

        paging_init();

        /* Initialize the MMU context management stuff. */
        mmu_context_init();

        /* Interrupt code needs to be 64K-aligned. */
        if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
                panic("Kernelbase not 64K-aligned (0x%lx)!\n",
                      (unsigned long)_stext);
}