/*      $OpenBSD: armv7_machdep.c,v 1.66 2023/07/05 08:15:34 jsg Exp $ */
/*      $NetBSD: lubbock_machdep.c,v 1.2 2003/07/15 00:25:06 lukem Exp $ */

/*
 * Copyright (c) 2002, 2003  Genetec Corporation.  All rights reserved.
 * Written by Hiroyuki Bessho for Genetec Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of Genetec Corporation may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GENETEC CORPORATION
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Machine dependant functions for kernel setup for
 * Intel DBPXA250 evaluation board (a.k.a. Lubbock).
 * Based on iq80310_machhdep.c
 */
/*
 * Copyright (c) 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1997,1998 Mark Brinicombe.
 * Copyright (c) 1997,1998 Causality Limited.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Mark Brinicombe
 *      for the NetBSD Project.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Machine dependant functions for kernel setup for ARMv7 boards using
 * u-boot/EFI firmware.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/reboot.h>

#include <machine/db_machdep.h>
#include <machine/bootconfig.h>
#include <machine/machine_reg.h>
#include <machine/bus.h>

#include <arm/undefined.h>
#include <arm/machdep.h>
#include <arm/armv7/armv7var.h>
#include <armv7/armv7/armv7_machdep.h>

#include <dev/cons.h>
#include <dev/efi/efi.h>
#include <dev/ofw/fdt.h>
#include <dev/ofw/openfirm.h>

#include <net/if.h>

#include <ddb/db_extern.h>

/* Kernel text starts 2MB in from the bottom of the kernel address space. */
#define KERNEL_TEXT_BASE        (KERNEL_BASE + 0x00000000)
#define KERNEL_VM_BASE          (KERNEL_BASE + 0x04000000)
#define KERNEL_VM_SIZE          VM_KERNEL_SPACE_SIZE

/*
 * Address to call from cpu_reset() to reset the machine.
 * This is machine architecture dependant as it varies depending
 * on where the ROM appears when you turn the MMU off.
 */

/* Define various stack sizes in pages */
#define IRQ_STACK_SIZE  1
#define ABT_STACK_SIZE  1
#define UND_STACK_SIZE  1

BootConfig bootconfig;          /* Boot config storage */
char *boot_args = NULL;
char *boot_file = "";
uint8_t *bootmac = NULL;
u_int cpu_reset_address = 0;

vaddr_t physical_freestart;
int physmem;

/* Physical and virtual addresses for some global pages */
pv_addr_t systempage;
pv_addr_t irqstack;
pv_addr_t undstack;
pv_addr_t abtstack;
extern pv_addr_t kernelstack;

vaddr_t msgbufphys;

extern u_int data_abort_handler_address;
extern u_int prefetch_abort_handler_address;
extern u_int undefined_handler_address;

#define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
#define KERNEL_PT_KERNEL        1       /* Page table for mapping kernel */
#define KERNEL_PT_KERNEL_NUM    32
#define KERNEL_PT_VMDATA        (KERNEL_PT_KERNEL+KERNEL_PT_KERNEL_NUM)
                                        /* Page tables for mapping kernel VM */
#define KERNEL_PT_VMDATA_NUM    8       /* start with 16MB of KVM */
#define NUM_KERNEL_PTS          (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM)

pv_addr_t kernel_pt_table[NUM_KERNEL_PTS];

extern struct user *proc0paddr;

/*
 * safepri is a safe priority for sleep to set for a spin-wait
 * during autoconfiguration or after a panic.
 */
int   safepri = 0;

/* Prototypes */

int     bootstrap_bs_map(void *, uint64_t, bus_size_t, int,
    bus_space_handle_t *);
void    collect_kernel_args(const char *);
void    process_kernel_args(void);
void    consinit(void);

bs_protos(bs_notimpl);

int stdout_node;
int stdout_speed;

void (*cpuresetfn)(void);
void (*powerdownfn)(void);

/*
 * void boot(int howto, char *bootstr)
 *
 * Reboots the system
 *
 * Deal with any syncing, unmounting, dumping and shutdown hooks,
 * then reset the CPU.
 */
__dead void
boot(int howto)
{
        if ((howto & RB_RESET) != 0)
                goto doreset;

        if (cold) {
                if ((howto & RB_USERREQ) == 0)
                        howto |= RB_HALT;
                goto haltsys;
        }

        /* Disable console buffering */
/*      cnpollc(1);*/

        /*
         * If RB_NOSYNC was not specified sync the discs.
         * Note: Unless cold is set to 1 here, syslogd will die during the
         * unmount.  It looks like syslogd is getting woken up only to find
         * that it cannot page part of the binary in as the filesystem has
         * been unmounted.
         */
        if ((howto & RB_NOSYNC) == 0)
                bootsync(howto);

        if_downall();

        uvm_shutdown();
        splhigh();
        cold = 1;

        if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
                dumpsys();

haltsys:
        config_suspend_all(DVACT_POWERDOWN);

        /* Make sure IRQ's are disabled */
        intr_disable();

        if ((howto & RB_HALT) != 0) {
                if ((howto & RB_POWERDOWN) != 0) {
                        printf("\nAttempting to power down...\n");
                        delay(500000);
                        if (powerdownfn)
                                (*powerdownfn)();
                }

                printf("The operating system has halted.\n");
                printf("Please press any key to reboot.\n\n");
                cngetc();
        }

doreset:
        printf("rebooting...\n");
        delay(500000);
        if (cpuresetfn)
                (*cpuresetfn)();
        printf("reboot failed; spinning\n");
        for (;;)
                continue;
        /* NOTREACHED */
}

static __inline
pd_entry_t *
read_ttb(void)
{
  long ttb;

  __asm volatile("mrc   p15, 0, %0, c2, c0, 0" : "=r" (ttb));


  return (pd_entry_t *)(ttb & ~((1<<14)-1));
}

#define VERBOSE_INIT_ARM

/*
 * simple memory mapping function used in early bootstrap stage
 * before pmap is initialized.
 * ignores cacheability and does map the sections with nocache.
 */
static vaddr_t section_free = 0xfd000000; /* XXX - huh */

int
bootstrap_bs_map(void *t, uint64_t bpa, bus_size_t size,
    int flags, bus_space_handle_t *bshp)
{
        u_long startpa, pa, endpa;
        vaddr_t va;
        pd_entry_t *pagedir = read_ttb();
        /* This assumes PA==VA for page directory */

        va = section_free;

        startpa = bpa & ~L1_S_OFFSET;
        endpa = (bpa + size) & ~L1_S_OFFSET;
        if ((bpa + size) & L1_S_OFFSET)
                endpa += L1_S_SIZE;

        *bshp = (bus_space_handle_t)(va + (bpa - startpa));

        for (pa = startpa; pa < endpa; pa += L1_S_SIZE, va += L1_S_SIZE)
                pmap_map_section((vaddr_t)pagedir, va, pa,
                    PROT_READ | PROT_WRITE, PTE_NOCACHE);

        cpu_tlb_flushD();

        section_free = va;

        return 0;
}

static void
copy_io_area_map(pd_entry_t *new_pd)
{
        pd_entry_t *cur_pd = read_ttb();
        vaddr_t va;

        for (va = MACHINE_IO_AREA_VBASE;
             (cur_pd[va>>L1_S_SHIFT] & L1_TYPE_MASK) == L1_TYPE_S;
             va += L1_S_SIZE) {

                new_pd[va>>L1_S_SHIFT] = cur_pd[va>>L1_S_SHIFT];
                if (va == (ARM_VECTORS_HIGH & ~(0x00400000 - 1)))
                        break; /* STUPID */

        }
}

uint64_t mmap_start;
uint32_t mmap_size;
uint32_t mmap_desc_size;
uint32_t mmap_desc_ver;

EFI_MEMORY_DESCRIPTOR *mmap;

/*
 * u_int initarm(...)
 *
 * Initial entry point on startup. This gets called before main() is
 * entered.
 * It should be responsible for setting up everything that must be
 * in place when main is called.
 * This includes
 *   Taking a copy of the FDT.
 *   Initialising the physical console so characters can be printed.
 *   Setting up page tables for the kernel.
 */
u_int
initarm(void *arg0, void *arg1, void *arg2, paddr_t loadaddr)
{
        int loop, loop1;
        u_int l1pagetable;
        pv_addr_t kernel_l1pt;
        pv_addr_t fdt, map;
        struct fdt_reg reg;
        paddr_t memstart, memend;
        void *config;
        size_t size;
        void *node;
        extern uint32_t esym; /* &_end if no symbols are loaded */

        /* early bus_space_map support */
        struct bus_space tmp_bs_tag;
        int     (*map_func_save)(void *, uint64_t, bus_size_t, int,
            bus_space_handle_t *);

        if (arg0)
                esym = (uint32_t)arg0;

        /*
         * Heads up ... Setup the CPU / MMU / TLB functions
         */
        if (set_cpufuncs())
                panic("cpu not recognized!");

        /*
         * Temporarily replace bus_space_map() functions so that
         * console devices can get mapped.
         */
        tmp_bs_tag = armv7_bs_tag;
        map_func_save = armv7_bs_tag.bs_map;
        armv7_bs_tag.bs_map = bootstrap_bs_map;
        tmp_bs_tag.bs_map = bootstrap_bs_map;

        /*
         * Now, map the FDT area.
         *
         * As we don't know the size of a possible FDT, map the size of a
         * typical bootstrap bs map.  The FDT might not be aligned, so this
         * might take up to two L1_S_SIZEd mappings.
         *
         * XXX: There's (currently) no way to unmap a bootstrap mapping, so
         * we might lose a bit of the bootstrap address space.
         */
        bootstrap_bs_map(NULL, (bus_addr_t)arg2, L1_S_SIZE, 0,
            (bus_space_handle_t *)&config);

        if (!fdt_init(config) || fdt_get_size(config) == 0)
                panic("initarm: no FDT");

        node = fdt_find_node("/chosen");
        if (node != NULL) {
                char *prop;
                int len;
                static uint8_t lladdr[6];

                len = fdt_node_property(node, "bootargs", &prop);
                if (len > 0)
                        collect_kernel_args(prop);

                len = fdt_node_property(node, "openbsd,boothowto", &prop);
                if (len == sizeof(boothowto))
                        boothowto = bemtoh32((uint32_t *)prop);

                len = fdt_node_property(node, "openbsd,bootduid", &prop);
                if (len == sizeof(bootduid))
                        memcpy(bootduid, prop, sizeof(bootduid));

                len = fdt_node_property(node, "openbsd,bootmac", &prop);
                if (len == sizeof(lladdr)) {
                        memcpy(lladdr, prop, sizeof(lladdr));
                        bootmac = lladdr;
                }

                len = fdt_node_property(node, "openbsd,uefi-mmap-start", &prop);
                if (len == sizeof(mmap_start))
                        mmap_start = bemtoh64((uint64_t *)prop);
                len = fdt_node_property(node, "openbsd,uefi-mmap-size", &prop);
                if (len == sizeof(mmap_size))
                        mmap_size = bemtoh32((uint32_t *)prop);
                len = fdt_node_property(node, "openbsd,uefi-mmap-desc-size", &prop);
                if (len == sizeof(mmap_desc_size))
                        mmap_desc_size = bemtoh32((uint32_t *)prop);
                len = fdt_node_property(node, "openbsd,uefi-mmap-desc-ver", &prop);
                if (len == sizeof(mmap_desc_ver))
                        mmap_desc_ver = bemtoh32((uint32_t *)prop);

                len = fdt_node_property(node, "openbsd,dma-constraint", &prop);
                if (len == sizeof(uint64_t[2])) {
                        dma_constraint.ucr_low = bemtoh64((uint64_t *)prop);
                        dma_constraint.ucr_high = bemtoh64((uint64_t *)prop + 1);
                }
        }

        process_kernel_args();

        if (mmap_start != 0)
                bootstrap_bs_map(NULL, mmap_start, mmap_size, 0,
                    (bus_space_handle_t *)&mmap);

        platform_init();

        /* setup a serial console for very early boot */
        consinit();

        /* Talk to the user */
        printf("\nOpenBSD/armv7 booting ...\n");

        printf("arg0 %p arg1 %p arg2 %p\n", arg0, arg1, arg2);

#ifdef RAMDISK_HOOKS
        boothowto |= RB_DFLTROOT;
#endif /* RAMDISK_HOOKS */

        physical_freestart = (((unsigned long)esym - KERNEL_TEXT_BASE + 0xfff) & ~0xfff) + loadaddr;

        /* The bootloader has loaded us ubto a 32MB block. */
        memstart = loadaddr;
        memend = memstart + 32 * 1024 * 1024;

        /*
         * Okay, the kernel starts 2MB in from the bottom of physical
         * memory.  We are going to allocate our bootstrap pages downwards
         * from there.
         *
         * We need to allocate some fixed page tables to get the kernel
         * going.  We allocate one page directory and a number of page
         * tables and store the physical addresses in the kernel_pt_table
         * array.
         *
         * The kernel page directory must be on a 16K boundary.  The page
         * tables must be on 4K boundaries.  What we do is allocate the
         * page directory on the first 16K boundary that we encounter, and
         * the page tables on 4K boundaries otherwise.  Since we allocate
         * at least 3 L2 page tables, we are guaranteed to encounter at
         * least one 16K aligned region.
         */

#ifdef VERBOSE_INIT_ARM
        printf("Allocating page tables\n");
#endif

        /* Define a macro to simplify memory allocation */
#define valloc_pages(var, np)                           \
        alloc_pages((var).pv_pa, (np));                 \
        (var).pv_va = KERNEL_BASE + (var).pv_pa - loadaddr;

#define alloc_pages(var, np)                            \
        (var) = physical_freestart;                     \
        physical_freestart += ((np) * PAGE_SIZE);       \
        if (physical_freestart > memend)                \
                panic("initarm: out of memory");        \
        memset((char *)(var), 0, ((np) * PAGE_SIZE));

        loop1 = 0;
        kernel_l1pt.pv_pa = 0;
        for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) {
                /* Are we 16KB aligned for an L1 ? */
                if (((physical_freestart) & (L1_TABLE_SIZE - 1)) == 0
                    && kernel_l1pt.pv_pa == 0) {
                        valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
                } else {
                        valloc_pages(kernel_pt_table[loop1],
                            L2_TABLE_SIZE / PAGE_SIZE);
                        ++loop1;
                }
        }

        /* This should never be able to happen but better confirm that. */
        if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE-1)) != 0)
                panic("initarm: Failed to align the kernel page directory");

        /*
         * Allocate a page for the system page mapped to V0x00000000
         * This page will just contain the system vectors and can be
         * shared by all processes.
         */
        vector_page = ARM_VECTORS_HIGH;
        alloc_pages(systempage.pv_pa, 1);
        systempage.pv_va = vector_page;

        /* Allocate stacks for all modes */
        valloc_pages(irqstack, IRQ_STACK_SIZE);
        valloc_pages(abtstack, ABT_STACK_SIZE);
        valloc_pages(undstack, UND_STACK_SIZE);
        valloc_pages(kernelstack, UPAGES);

        /* Allocate enough pages for cleaning the Mini-Data cache. */

#ifdef VERBOSE_INIT_ARM
        printf("IRQ stack: p0x%08lx v0x%08lx\n", irqstack.pv_pa,
            irqstack.pv_va);
        printf("ABT stack: p0x%08lx v0x%08lx\n", abtstack.pv_pa,
            abtstack.pv_va);
        printf("UND stack: p0x%08lx v0x%08lx\n", undstack.pv_pa,
            undstack.pv_va);
        printf("SVC stack: p0x%08lx v0x%08lx\n", kernelstack.pv_pa,
            kernelstack.pv_va);
#endif

        /* Relocate the FDT to safe memory. */
        size = fdt_get_size(config);
        valloc_pages(fdt, round_page(size) / PAGE_SIZE);
        memcpy((void *)fdt.pv_pa, config, size);

        /* Relocate the EFI memory map too. */
        if (mmap_start != 0) {
                valloc_pages(map, round_page(mmap_size) / PAGE_SIZE);
                memcpy((void *)map.pv_pa, mmap, mmap_size);
        }

        /*
         * XXX Defer this to later so that we can reclaim the memory
         */
        alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / PAGE_SIZE);

        /*
         * Ok we have allocated physical pages for the primary kernel
         * page tables
         */

#ifdef VERBOSE_INIT_ARM
        printf("Creating L1 page table at 0x%08lx\n", kernel_l1pt.pv_pa);
#endif

        /*
         * Now we start construction of the L1 page table
         * We start by mapping the L2 page tables into the L1.
         * This means that we can replace L1 mappings later on if necessary
         */
        l1pagetable = kernel_l1pt.pv_pa;

        /* Map the L2 pages tables in the L1 page table */
        pmap_link_l2pt(l1pagetable, vector_page & ~(0x00400000 - 1),
            &kernel_pt_table[KERNEL_PT_SYS]);

        for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++)
                pmap_link_l2pt(l1pagetable, KERNEL_BASE + loop * 0x00400000,
                    &kernel_pt_table[KERNEL_PT_KERNEL + loop]);

        for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++)
                pmap_link_l2pt(l1pagetable, KERNEL_VM_BASE + loop * 0x00400000,
                    &kernel_pt_table[KERNEL_PT_VMDATA + loop]);

        /* update the top of the kernel VM */
        pmap_curmaxkvaddr =
            KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000);

#ifdef VERBOSE_INIT_ARM
        printf("Mapping kernel\n");
#endif

        /* Now we fill in the L2 pagetable for the kernel static code/data */
        {
                extern char __text_start[], _etext[];
                extern char __rodata_start[], _erodata[];
                size_t textsize = (u_int32_t) (_etext - __text_start);
                size_t rodatasize = (u_int32_t) (_erodata - __rodata_start);
                size_t totalsize = esym - (u_int32_t)__text_start;
                u_int logical;

                textsize = (textsize + PGOFSET) & ~PGOFSET;
                rodatasize = (rodatasize + PGOFSET) & ~PGOFSET;
                totalsize = (totalsize + PGOFSET) & ~PGOFSET;

                logical = 0x00300000;   /* offset of kernel in RAM */

                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    loadaddr + logical, textsize,
                    PROT_READ | PROT_EXEC, PTE_CACHE);
                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    loadaddr + logical, rodatasize,
                    PROT_READ, PTE_CACHE);
                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    loadaddr + logical, totalsize - (textsize + rodatasize),
                    PROT_READ | PROT_WRITE, PTE_CACHE);
        }

#ifdef VERBOSE_INIT_ARM
        printf("Constructing L2 page tables\n");
#endif

        /* Map the stack pages */
        pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa,
            IRQ_STACK_SIZE * PAGE_SIZE, PROT_READ | PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
            ABT_STACK_SIZE * PAGE_SIZE, PROT_READ | PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
            UND_STACK_SIZE * PAGE_SIZE, PROT_READ | PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
            UPAGES * PAGE_SIZE, PROT_READ | PROT_WRITE, PTE_CACHE);

        pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
            L1_TABLE_SIZE, PROT_READ | PROT_WRITE, PTE_PAGETABLE);

        for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
                pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va,
                    kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE,
                    PROT_READ | PROT_WRITE, PTE_PAGETABLE);
        }

        /* Map the Mini-Data cache clean area. */

        /* Map the vector page. */
        pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
            PROT_READ | PROT_WRITE, PTE_CACHE);

        /* Map the FDT. */
        pmap_map_chunk(l1pagetable, fdt.pv_va, fdt.pv_pa,
            round_page(fdt_get_size((void *)fdt.pv_pa)),
            PROT_READ | PROT_WRITE, PTE_CACHE);

        /* Map the EFI memory map. */
        if (mmap_start != 0) {
                pmap_map_chunk(l1pagetable, map.pv_va, map.pv_pa,
                    round_page(mmap_size),
                    PROT_READ | PROT_WRITE, PTE_CACHE);
                mmap = (void *)map.pv_va;
        }

        /*
         * map integrated peripherals at same address in l1pagetable
         * so that we can continue to use console.
         */
        copy_io_area_map((pd_entry_t *)l1pagetable);

        /*
         * Now we have the real page tables in place so we can switch to them.
         * Once this is done we will be running with the REAL kernel page
         * tables.
         */
        setttb(kernel_l1pt.pv_pa);
        cpu_tlb_flushID();

        /*
         * Moved from cpu_startup() as data_abort_handler() references
         * this during uvm init
         */
        proc0paddr = (struct user *)kernelstack.pv_va;
        proc0.p_addr = proc0paddr;

        arm32_vector_init(vector_page, ARM_VEC_ALL);

        /*
         * Pages were allocated during the secondary bootstrap for the
         * stacks for different CPU modes.
         * We must now set the r13 registers in the different CPU modes to
         * point to these stacks.
         * Since the ARM stacks use STMFD etc. we must set r13 to the top end
         * of the stack memory.
         */

        set_stackptr(PSR_IRQ32_MODE,
            irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
        set_stackptr(PSR_ABT32_MODE,
            abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
        set_stackptr(PSR_UND32_MODE,
            undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);

        /*
         * Well we should set a data abort handler.
         * Once things get going this will change as we will need a proper
         * handler.
         * Until then we will use a handler that just panics but tells us
         * why.
         * Initialisation of the vectors will just panic on a data abort.
         * This just fills in a slightly better one.
         */

        data_abort_handler_address = (u_int)data_abort_handler;
        prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
        undefined_handler_address = (u_int)undefinedinstruction_bounce;

        /* Now we can reinit the FDT, using the virtual address. */
        fdt_init((void *)fdt.pv_va);

        /* Initialise the undefined instruction handlers */
#ifdef VERBOSE_INIT_ARM
        printf("undefined ");
#endif
        undefined_init();

        /* Load memory into UVM. */
#ifdef VERBOSE_INIT_ARM
        printf("page ");
#endif
        uvm_setpagesize();        /* initialize PAGE_SIZE-dependent variables */

        /* Make what's left of the initial 32MB block available to UVM. */
        uvm_page_physload(atop(physical_freestart), atop(memend),
            atop(physical_freestart), atop(memend), 0);
        physmem = atop(memend - memstart);

        /* Make all other physical memory available to UVM. */
        if (mmap && mmap_desc_ver == EFI_MEMORY_DESCRIPTOR_VERSION) {
                EFI_MEMORY_DESCRIPTOR *desc = mmap;
                int i;

                /*
                 * Load all memory marked as EfiConventionalMemory.
                 * Don't bother with blocks smaller than 64KB.  The
                 * initial 64MB memory block should be marked as
                 * EfiLoaderData so it won't be added again here.
                 */
                for (i = 0; i < mmap_size / mmap_desc_size; i++) {
                        printf("type 0x%x pa 0x%llx va 0x%llx pages 0x%llx attr 0x%llx\n",
                            desc->Type, desc->PhysicalStart,
                            desc->VirtualStart, desc->NumberOfPages,
                            desc->Attribute);
                        if (desc->Type == EfiConventionalMemory &&
                            desc->NumberOfPages >= 16) {
                                uvm_page_physload(atop(desc->PhysicalStart),
                                    atop(desc->PhysicalStart) +
                                    desc->NumberOfPages,
                                    atop(desc->PhysicalStart),
                                    atop(desc->PhysicalStart) +
                                    desc->NumberOfPages, 0);
                                physmem += desc->NumberOfPages;
                        }
                        desc = NextMemoryDescriptor(desc, mmap_desc_size);
                }
        } else {
                paddr_t start, end;
                int i;

                node = fdt_find_node("/memory");
                if (node == NULL)
                        panic("%s: no memory specified", __func__);

                for (i = 0; i < VM_PHYSSEG_MAX; i++) {
                        if (fdt_get_reg(node, i, &reg))
                                break;
                        if (reg.size == 0)
                                continue;

                        start = reg.addr;
                        end = MIN(reg.addr + reg.size, (paddr_t)-PAGE_SIZE);

                        /*
                         * The initial 32MB block is not excluded, so we need
                         * to make sure we don't add it here.
                         */
                        if (start < memend && end > memstart) {
                                if (start < memstart) {
                                        uvm_page_physload(atop(start),
                                            atop(memstart), atop(start),
                                            atop(memstart), 0);
                                        physmem += atop(memstart - start);
                                }
                                if (end > memend) {
                                        uvm_page_physload(atop(memend),
                                            atop(end), atop(memend),
                                            atop(end), 0);
                                        physmem += atop(end - memend);
                                }
                        } else {
                                uvm_page_physload(atop(start), atop(end),
                                    atop(start), atop(end), 0);
                                physmem += atop(end - start);
                        }
                }
        }

        /* Boot strap pmap telling it where the kernel page table is */
#ifdef VERBOSE_INIT_ARM
        printf("pmap ");
#endif
        pmap_bootstrap((pd_entry_t *)kernel_l1pt.pv_va, KERNEL_VM_BASE,
            KERNEL_VM_BASE + KERNEL_VM_SIZE);

        vector_page_setprot(PROT_READ | PROT_EXEC);

        /*
         * Restore proper bus_space operation, now that pmap is initialized.
         */
        armv7_bs_tag.bs_map = map_func_save;

#ifdef DDB
        db_machine_init();

        /* Firmware doesn't load symbols. */
        ddb_init();

        if (boothowto & RB_KDB)
                db_enter();
#endif

        cpu_setup();

        /* We return the new stack pointer address */
        return(kernelstack.pv_va + USPACE_SVC_STACK_TOP);
}

char    bootargs[256];

void
collect_kernel_args(const char *args)
{
        /* Make a local copy of the bootargs */
        strlcpy(bootargs, args, sizeof(bootargs));
}

void
process_kernel_args(void)
{
        char *cp = bootargs;

        if (*cp == 0)
                return;

        boot_file = bootargs;

        /* Skip the kernel image filename */
        while (*cp != ' ' && *cp != 0)
                cp++;

        if (*cp != 0)
                *cp++ = 0;

        while (*cp == ' ')
                cp++;

        boot_args = cp;

        printf("bootfile: %s\n", boot_file);
        printf("bootargs: %s\n", boot_args);

        /* Setup pointer to boot flags */
        while (*cp != '-')
                if (*cp++ == '\0')
                        return;

        while (*cp != 0) {
                switch(*cp) {
                case 'a':
                        boothowto |= RB_ASKNAME;
                        break;
                case 'c':
                        boothowto |= RB_CONFIG;
                        break;
                case 'd':
                        boothowto |= RB_KDB;
                        break;
                case 's':
                        boothowto |= RB_SINGLE;
                        break;
                default:
                        printf("unknown option `%c'\n", *cp);
                        break;
                }
                cp++;
        }
}

static int
atoi(const char *s)
{
        int n, neg;

        n = 0;
        neg = 0;

        while (*s == '-') {
                s++;
                neg = !neg;
        }

        while (*s != '\0') {
                if (*s < '0' || *s > '9')
                        break;

                n = (10 * n) + (*s - '0');
                s++;
        }

        return (neg ? -n : n);
}

void *
fdt_find_cons(const char *name)
{
        char *alias = "serial0";
        char buf[128];
        char *stdout = NULL;
        char *p;
        void *node;

        /* First check if "stdout-path" is set. */
        node = fdt_find_node("/chosen");
        if (node) {
                if (fdt_node_property(node, "stdout-path", &stdout) > 0) {
                        if (strchr(stdout, ':') != NULL) {
                                strlcpy(buf, stdout, sizeof(buf));
                                if ((p = strchr(buf, ':')) != NULL) {
                                        *p++ = '\0';
                                        stdout_speed = atoi(p);
                                }
                                stdout = buf;
                        }
                        if (stdout[0] != '/') {
                                /* It's an alias. */
                                alias = stdout;
                                stdout = NULL;
                        }
                }
        }

        /* Perform alias lookup if necessary. */
        if (stdout == NULL) {
                node = fdt_find_node("/aliases");
                if (node)
                        fdt_node_property(node, alias, &stdout);
        }

        /* Lookup the physical address of the interface. */
        if (stdout) {
                node = fdt_find_node(stdout);
                if (node && fdt_is_compatible(node, name)) {
                        stdout_node = OF_finddevice(stdout);
                        return (node);
                }
        }

        return (NULL);
}

void
consinit(void)
{
        static int consinit_called = 0;

        if (consinit_called != 0)
                return;

        consinit_called = 1;

        platform_init_cons();
}

void
board_startup(void)
{
        if (boothowto & RB_CONFIG) {
#ifdef BOOT_CONFIG
                user_config();
#else
                printf("kernel does not support -c; continuing..\n");
#endif
        }
}

unsigned int
cpu_rnd_messybits(void)
{
        struct timespec ts;

        nanotime(&ts);
        return (ts.tv_nsec ^ (ts.tv_sec << 20));
}