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[netbsd-mini2440.git] / sys / arch / evbarm / gumstix / gumstix_machdep.c

/*      $NetBSD$ */
/*
 * Copyright (C) 2005, 2006, 2007  WIDE Project and SOUM Corporation.
 * All rights reserved.
 *
 * Written by Takashi Kiyohara and Susumu Miki for WIDE Project and SOUM
 * 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. Neither the name of the project nor the name of SOUM Corporation
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT and SOUM 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 THE PROJECT AND SOUM 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.
 */
/*
 * Copyright (c) 2002, 2003, 2004, 2005  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 Genetec G4250EBX
 * evaluation board.
 *
 * 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 Intel IQ80310 evaluation
 * boards using RedBoot firmware.
 */

#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_pmap_debug.h"
#include "opt_md.h"
#include "opt_modular.h"
#include "opt_com.h"
#include "md.h"

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/exec.h>
#include <sys/proc.h>
#include <sys/msgbuf.h>
#include <sys/reboot.h>
#include <sys/termios.h>
#include <sys/ksyms.h>

#include <uvm/uvm_extern.h>

#include <sys/conf.h>
#include <dev/cons.h>
#include <dev/md.h>

#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#ifdef KGDB
#include <sys/kgdb.h>
#endif

#include <machine/bootconfig.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <arm/undefined.h>

#include <arm/arm32/machdep.h>

#include <arm/xscale/pxa2x0reg.h>
#include <arm/xscale/pxa2x0var.h>
#include <arm/xscale/pxa2x0_gpio.h>
#include <evbarm/gumstix/gumstixreg.h>
#include <evbarm/gumstix/gumstixvar.h>

/* Kernel text starts 2MB in from the bottom of the kernel address space. */
#define KERNEL_TEXT_BASE        (KERNEL_BASE + 0x00200000)
#define KERNEL_VM_BASE          (KERNEL_BASE + 0x01000000)

/*
 * The range 0xc1000000 - 0xccffffff is available for kernel VM space
 * Core-logic registers and I/O mappings occupy 0xfd000000 - 0xffffffff
 */
#define KERNEL_VM_SIZE          0x0C000000


/*
 * 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.
 */

u_int cpu_reset_address = 0;

/* 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 */
static char bootargs[MAX_BOOT_STRING];
char *boot_args = NULL;

uint32_t system_serial_high;
uint32_t system_serial_low;

vm_offset_t physical_start;
vm_offset_t physical_freestart;
vm_offset_t physical_freeend;
vm_offset_t physical_end;
u_int free_pages;

/*int debug_flags;*/
#ifndef PMAP_STATIC_L1S
int max_processes = 64;                 /* Default number */
#endif  /* !PMAP_STATIC_L1S */

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

vm_offset_t msgbufphys;

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

#ifdef PMAP_DEBUG
extern int pmap_debug_level;
#endif

#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    4
#define KERNEL_PT_VMDATA        (KERNEL_PT_KERNEL+KERNEL_PT_KERNEL_NUM)
                                        /* Page tables for mapping kernel VM */
#define KERNEL_PT_VMDATA_NUM    4       /* 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];

/* Prototypes */
static void     read_system_serial(void);
static void     process_kernel_args(int, char *[]);
static void     process_kernel_args_line(char *);
#ifdef KGDB
static void     kgdb_port_init(void);
#endif

bs_protos(bs_notimpl);

#include "com.h"
#if NCOM > 0
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#endif

#include "lcd.h"

#ifndef CONSPEED
#define CONSPEED B115200        /* It's a setting of the default of u-boot */
#endif
#ifndef CONMODE
#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#endif

int comcnspeed = CONSPEED;
int comcnmode = CONMODE;

extern void gxio_config_pin(void);
extern void gxio_config_expansion(char *);

/*
 * void cpu_reboot(int howto, char *bootstr)
 *
 * Deal with any syncing, unmounting, dumping and shutdown hooks,
 * then reset the CPU.
 */
void
cpu_reboot(int howto, char *bootstr)
{

#ifdef DIAGNOSTIC
        /* info */
        printf("boot: howto=%08x curproc=%p\n", howto, curproc);
#endif

        /*
         * If we are still cold then hit the air brakes
         * and crash to earth fast
         */
        if (cold) {
                doshutdownhooks();
                pmf_system_shutdown(boothowto);
                printf("The operating system has halted.\n");
                printf("Please press any key to reboot.\n\n");
                cngetc();
                printf("rebooting...\n");
                cpu_reset();
                /*NOTREACHED*/
        }

        /*
         * 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))
                bootsync();

        /* Say NO to interrupts */
        splhigh();

        /* Do a dump if requested. */
        if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
                dumpsys();
        
        /* Run any shutdown hooks */
        doshutdownhooks();

        pmf_system_shutdown(boothowto);

        /* Make sure IRQ's are disabled */
        IRQdisable;

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

        printf("rebooting...\n");
        cpu_reset();
        /*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));
}

/*
 * Static device mappings. These peripheral registers are mapped at
 * fixed virtual addresses very early in initarm() so that we can use
 * them while booting the kernel, and stay at the same address
 * throughout whole kernel's life time.
 *
 * We use this table twice; once with bootstrap page table, and once
 * with kernel's page table which we build up in initarm().
 *
 * Since we map these registers into the bootstrap page table using
 * pmap_devmap_bootstrap() which calls pmap_map_chunk(), we map
 * registers segment-aligned and segment-rounded in order to avoid
 * using the 2nd page tables.
 */

#define _A(a)   ((a) & ~L1_S_OFFSET)
#define _S(s)   (((s) + L1_S_SIZE - 1) & ~(L1_S_SIZE-1))

static const struct pmap_devmap gumstix_devmap[] = {
        {
                GUMSTIX_GPIO_VBASE,
                _A(PXA2X0_GPIO_BASE),
                _S(PXA250_GPIO_SIZE),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_CLKMAN_VBASE,
                _A(PXA2X0_CLKMAN_BASE),
                _S(PXA2X0_CLKMAN_SIZE),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_INTCTL_VBASE,
                _A(PXA2X0_INTCTL_BASE),
                _S(PXA2X0_INTCTL_SIZE),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_FFUART_VBASE,
                _A(PXA2X0_FFUART_BASE),
                _S(4 * COM_NPORTS),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_STUART_VBASE,
                _A(PXA2X0_STUART_BASE),
                _S(4 * COM_NPORTS),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_BTUART_VBASE,
                _A(PXA2X0_BTUART_BASE),
                _S(4 * COM_NPORTS),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_HWUART_VBASE,
                _A(PXA2X0_HWUART_BASE),
                _S(4 * COM_NPORTS),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {
                GUMSTIX_LCDC_VBASE,
                _A(PXA2X0_LCDC_BASE),
                _S(4 * COM_NPORTS),
                VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE,
        },
        {0, 0, 0, 0, 0}
};

#undef  _A
#undef  _S


/*
 * 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 boot configuration structure.
 *   Initialising the physical console so characters can be printed.
 *   Setting up page tables for the kernel
 *   Relocating the kernel to the bottom of physical memory
 */
u_int
initarm(void *arg)
{
        extern vaddr_t xscale_cache_clean_addr;
        extern uint32_t *u_boot_args[];
        extern uint32_t ram_size;
        enum { r0 = 0, r1 = 1, r2 = 2, r3 = 3 }; /* args from u-boot */
        int loop;
        int loop1;
        u_int l1pagetable;
        paddr_t memstart;
        psize_t memsize;
#ifdef DIAGNOSTIC
        extern vsize_t xscale_minidata_clean_size; /* used in KASSERT */
#endif

        /* map some peripheral registers at static I/O area */
        pmap_devmap_bootstrap((vaddr_t)read_ttb(), gumstix_devmap);

        /* start 32.768kHz OSC */
        ioreg_write(GUMSTIX_CLKMAN_VBASE + CLKMAN_OSCC, OSCC_OON);

        /* Get ready for splfoo() */
        pxa2x0_intr_bootstrap(GUMSTIX_INTCTL_VBASE);

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

        /*
         * U-Boot doesn't use the virtual memory.
         *
         * Physical Address Range     Description
         * -----------------------    ----------------------------------
         * 0x00000000 - 0x00ffffff    flash Memory   (16MB or 4MB)
         * 0x40000000 - 0x480fffff    Processor Registers
         * 0xa0000000 - 0xa3ffffff    SDRAM Bank 0 (64MB)
         */

        cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);

        /* setup GPIO for {FF,ST,HW}UART. */
        pxa2x0_gpio_bootstrap(GUMSTIX_GPIO_VBASE);

        /* configure GPIOs. */
        gxio_config_pin();

        pxa2x0_clkman_bootstrap(GUMSTIX_CLKMAN_VBASE);

        consinit();
#ifdef KGDB
        kgdb_port_init();
#endif

        /* Talk to the user */
        printf("\nNetBSD/evbarm (gumstix) booting ...\n");

        /* Read system serial */
        read_system_serial();

        /*
         * Examine the boot args string for options we need to know about
         * now.
         */
#define SDRAM_START     0xa0000000UL
        if (((uint32_t)u_boot_args[r0] & 0xf0000000) != SDRAM_START)
                /* Maybe r0 is 'argc'.  We are booted by command 'go'. */
                process_kernel_args((int)u_boot_args[r0],
                    (char **)u_boot_args[r1]);
        else
                /*
                 * Maybe r3 is 'boot args string' of 'bootm'.  This string is
                 * linely.
                 */
                process_kernel_args_line((char *)u_boot_args[r3]);

        memstart = SDRAM_START;
        memsize = ram_size;

#ifdef VERBOSE_INIT_ARM
        printf("initarm: Configuring system ...\n");
#endif

        /* Fake bootconfig structure for the benefit of pmap.c */
        /* XXX must make the memory description h/w independent */
        bootconfig.dramblocks = 1;
        bootconfig.dram[0].address = memstart;
        bootconfig.dram[0].pages = memsize / PAGE_SIZE;

        /*
         * Set up the variables that define the availablilty of
         * physical memory.  For now, we're going to set
         * physical_freestart to 0xa0200000 (where the kernel
         * was loaded), and allocate the memory we need downwards.
         * If we get too close to the L1 table that we set up, we
         * will panic.  We will update physical_freestart and
         * physical_freeend later to reflect what pmap_bootstrap()
         * wants to see.
         *
         * XXX pmap_bootstrap() needs an enema.
         */
        physical_start = bootconfig.dram[0].address;
        physical_end = physical_start + memsize;

        physical_freestart = 0xa0009000UL;
        physical_freeend = 0xa0200000UL;

        physmem = (physical_end - physical_start) / PAGE_SIZE;

#ifdef VERBOSE_INIT_ARM
        /* Tell the user about the memory */
        printf("physmemory: %d pages at 0x%08lx -> 0x%08lx\n", physmem,
            physical_start, physical_end - 1);
#endif

        /*
         * 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 bounaries.  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

        free_pages = (physical_freeend - physical_freestart) / PAGE_SIZE;

#ifdef VERBOSE_INIT_ARM
        printf("freestart = 0x%08lx, free_pages = %d (0x%08x)\n",
               physical_freestart, free_pages, free_pages);
#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 - physical_start;

#define alloc_pages(var, np)                            \
        physical_freeend -= ((np) * PAGE_SIZE);         \
        if (physical_freeend < physical_freestart)      \
                panic("initarm: out of memory");        \
        (var) = physical_freeend;                       \
        free_pages -= (np);                             \
        memset((char *)(var), 0, ((np) * PAGE_SIZE));

        loop1 = 0;
        for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) {
                /* Are we 16KB aligned for an L1 ? */
                if ((physical_freeend & (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.
         */
        alloc_pages(systempage.pv_pa, 1);

        /* 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. */
        KASSERT(xscale_minidata_clean_size <= PAGE_SIZE);
        valloc_pages(minidataclean, 1);

#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

        /*
         * XXX Defer this to later so that we can reclaim the memory
         * XXX used by the RedBoot page tables.
         */
        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_va;

        /* Map the L2 pages tables in the L1 page table */
        pmap_link_l2pt(l1pagetable, 0x00000000,
            &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 etext[], _end[];
                size_t textsize = (uintptr_t) etext - KERNEL_TEXT_BASE;
                size_t totalsize = (uintptr_t) _end - KERNEL_TEXT_BASE;
                u_int logical;

                textsize = (textsize + PGOFSET) & ~PGOFSET;
                totalsize = (totalsize + PGOFSET) & ~PGOFSET;
                
                logical = 0x00200000;   /* offset of kernel in RAM */

                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    physical_start + logical, textsize,
                    VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    physical_start + logical, totalsize - textsize,
                    VM_PROT_READ|VM_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, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
            ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
            UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
            UPAGES * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE);

        pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
            L1_TABLE_SIZE, VM_PROT_READ | VM_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,
                    VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
        }

        /* Map the Mini-Data cache clean area. */
        xscale_setup_minidata(l1pagetable, minidataclean.pv_va,
            minidataclean.pv_pa);

        /* Map the vector page. */
#if 1
        /* MULTI-ICE requires that page 0 is NC/NB so that it can download the
         * cache-clean code there.  */
        pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
            VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE);
#else
        pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
#endif

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

        /*
         * Give the XScale global cache clean code an appropriately
         * sized chunk of unmapped VA space starting at 0xff000000
         * (our device mappings end before this address).
         */
        xscale_cache_clean_addr = 0xff000000U;

        /*
         * 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.
         */

        /*
         * Update the physical_freestart/physical_freeend/free_pages
         * variables.
         */
        {
                extern char _end[];

                physical_freestart = physical_start +
                    (((((uintptr_t) _end) + PGOFSET) & ~PGOFSET) -
                     KERNEL_BASE);
                physical_freeend = physical_end;
                free_pages =
                    (physical_freeend - physical_freestart) / PAGE_SIZE;
        }

        /* Switch tables */
#ifdef VERBOSE_INIT_ARM
        printf("freestart = 0x%08lx, free_pages = %d (0x%x)\n",
               physical_freestart, free_pages, free_pages);
        printf("switching to new L1 page table  @%#lx...", kernel_l1pt.pv_pa);
#endif

        cpu_setttb(kernel_l1pt.pv_pa);
        cpu_tlb_flushID();
        cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));

        /*
         * Moved from cpu_startup() as data_abort_handler() references
         * this during uvm init
         */
        uvm_lwp_setuarea(&lwp0, kernelstack.pv_va);

#ifdef VERBOSE_INIT_ARM
        printf("bootstrap done.\n");
#endif

        arm32_vector_init(ARM_VECTORS_LOW, 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.
         */
#ifdef  VERBOSE_INIT_ARM
        printf("init subsystems: stacks ");
#endif

        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 slighly better one.
         */
#ifdef  VERBOSE_INIT_ARM
        printf("vectors ");
#endif
        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;

        /* 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 */
        uvm_page_physload(atop(physical_freestart), atop(physical_freeend),
            atop(physical_freestart), atop(physical_freeend),
            VM_FREELIST_DEFAULT);

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

#ifdef __HAVE_MEMORY_DISK__
        md_root_setconf(memory_disk, sizeof memory_disk);
#endif

#ifdef BOOTHOWTO
        boothowto |= BOOTHOWTO;
#endif

#ifdef KGDB
        if (boothowto & RB_KDB) {
                kgdb_debug_init = 1;
                kgdb_connect(1);
        }
#endif

#if NKSYMS || defined(DDB) || defined(MODULAR)
        /* Firmware doesn't load symbols. */
        ddb_init(0, NULL, NULL);
#endif

#ifdef DDB
        db_machine_init();
        if (boothowto & RB_KDB)
                Debugger();
#endif

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

static void
read_system_serial(void)
{
#define GUMSTIX_SYSTEM_SERIAL_ADDR      0
#define GUMSTIX_SYSTEM_SERIAL_SIZE      8
#define FLASH_OFFSET_INTEL_PROTECTION   0x81
#define FLASH_OFFSET_USER_PROTECTION    0x85
#define FLASH_CMD_READ_ID               0x90
#define FLASH_CMD_RESET                 0xff
        int i;
        char system_serial[GUMSTIX_SYSTEM_SERIAL_SIZE], *src;
        char x;

        src = (char *)(FLASH_OFFSET_USER_PROTECTION * 2 /*word*/);
        *(volatile uint16_t *)0 = FLASH_CMD_READ_ID;
        memcpy(system_serial,
            src + GUMSTIX_SYSTEM_SERIAL_ADDR, sizeof (system_serial));
        *(volatile uint16_t *)0 = FLASH_CMD_RESET;

        for (i = 1, x = system_serial[0]; i < sizeof (system_serial); i++)
                x &= system_serial[i];
        if (x == 0xff) {
                src = (char *)(FLASH_OFFSET_INTEL_PROTECTION * 2 /*word*/);
                *(volatile uint16_t *)0 = FLASH_CMD_READ_ID;
                memcpy(system_serial,
                    src + GUMSTIX_SYSTEM_SERIAL_ADDR, sizeof (system_serial));
                *(volatile uint16_t *)0 = FLASH_CMD_RESET;

                /*
                 * XXXX: Don't need ???
                 * gumstix_serial_hash(system_serial);
                 */
        }
        system_serial_high = system_serial[0] << 24 | system_serial[1] << 16 |
            system_serial[2] << 8 | system_serial[3];
        system_serial_low = system_serial[4] << 24 | system_serial[5] << 16 |
            system_serial[6] << 8 | system_serial[7];

        printf("system serial: 0x");
        for (i = 0; i < sizeof (system_serial); i++)
                printf("%02x", system_serial[i]);
        printf("\n");
}

static const char busheader_name[] = "busheader=";
static void
process_kernel_args(int argc, char *argv[])
{
        int gxio_configured = 0, i, j;

        boothowto = 0;

        for (i = 1, j = 0; i < argc; i++) {
                if (!strncmp(argv[i], busheader_name, strlen(busheader_name))) {
                        /* configure for GPIOs of busheader side */
                        gxio_config_expansion(argv[i] + strlen(busheader_name));
                        gxio_configured = 1;
                        continue;
                }
                if (j == MAX_BOOT_STRING) {
                        *(bootargs + j) = '\0';
                        continue;
                }
                if (j != 0)
                        *(bootargs + j++) = ' ';
                strncpy(bootargs + j, argv[i], MAX_BOOT_STRING - j);
                j += strlen(argv[i]);
        }
        boot_args = bootargs;

        parse_mi_bootargs(boot_args);

        if (!gxio_configured)
                gxio_config_expansion(NULL);
}

static void
process_kernel_args_line(char *args)
{
        int i;
        char expansion[256], *p, c;

        boothowto = 0;

        strncpy(bootargs, args, sizeof(bootargs));
        p = strstr(bootargs, busheader_name);
        if (p == NULL)
                gxio_config_expansion(NULL);
        else {
                i = 0;
                do {
                        c = *(p + strlen(busheader_name) + i);
                        if (c == ' ')
                                c = '\0';
                        expansion[i++] = c;
                } while (c != '\0');
                gxio_config_expansion(expansion);
                strcpy(p, p + i);
        }
        boot_args = bootargs;

        parse_mi_bootargs(boot_args);
}

#ifdef KGDB
#ifndef KGDB_DEVNAME
#define KGDB_DEVNAME    "ffuart"
#endif
const char kgdb_devname[] = KGDB_DEVNAME;

#ifndef KGDB_DEVRATE
#define KGDB_DEVRATE    CONSPEED
#endif
int kgdb_devrate = KGDB_DEVRATE;

#if (NCOM > 0)
#ifndef KGDB_DEVMODE
#define KGDB_DEVMODE    CONMODE
#endif
int comkgdbmode = KGDB_DEVMODE;
#endif /* NCOM */

#endif /* KGDB */


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

        if (consinit_called != 0)
                return;

        consinit_called = 1;

#if NCOM > 0

#ifdef FFUARTCONSOLE
#ifdef KGDB
        if (0 == strcmp(kgdb_devname, "ffuart")){
                /* port is reserved for kgdb */
        } else
#endif
        {
                if (0 == comcnattach(&pxa2x0_a4x_bs_tag, PXA2X0_FFUART_BASE,
                    comcnspeed, PXA2X0_COM_FREQ, COM_TYPE_PXA2x0, comcnmode)) {
                        pxa2x0_clkman_config(CKEN_FFUART, 1);
                        return;
                }
        }
#endif /* FFUARTCONSOLE */

#ifdef STUARTCONSOLE
#ifdef KGDB
        if (0 == strcmp(kgdb_devname, "stuart")) {
                /* port is reserved for kgdb */
        } else
#endif
        {
                if (0 == comcnattach(&pxa2x0_a4x_bs_tag, PXA2X0_STUART_BASE,
                    comcnspeed, PXA2X0_COM_FREQ, COM_TYPE_PXA2x0, comcnmode)) {
                        pxa2x0_clkman_config(CKEN_STUART, 1);
                        return;
                }
        }
#endif /* STUARTCONSOLE */

#ifdef BTUARTCONSOLE
#ifdef KGDB
        if (0 == strcmp(kgdb_devname, "btuart")) {
                /* port is reserved for kgdb */
        } else
#endif
        {
                if (0 == comcnattach(&pxa2x0_a4x_bs_tag, PXA2X0_BTUART_BASE,
                    comcnspeed, PXA2X0_COM_FREQ, COM_TYPE_PXA2x0, comcnmode)) {
                        pxa2x0_clkman_config(CKEN_BTUART, 1);
                        return;
                }
        }
#endif /* BTUARTCONSOLE */

#ifdef HWUARTCONSOLE
#ifdef KGDB
        if (0 == strcmp(kgdb_devname, "hwuart")) {
                /* port is reserved for kgdb */
        } else
#endif
        {
                if (0 == comcnattach(&pxa2x0_a4x_bs_tag, PXA2X0_HWUART_BASE,
                    comcnspeed, PXA2X0_COM_FREQ, COM_TYPE_PXA2x0, comcnmode)) {
                        pxa2x0_clkman_config(CKEN_HWUART, 1);
                        return;
                }
        }
#endif /* HWUARTCONSOLE */

#endif /* NCOM */

#if NLCD > 0
        gxlcd_cnattach();
#endif
}

#ifdef KGDB
static void
kgdb_port_init(void)
{
#if (NCOM > 0) && defined(COM_PXA2X0)
        paddr_t paddr = 0;
        int cken = 0;

        if (0 == strcmp(kgdb_devname, "ffuart")) {
                paddr = PXA2X0_FFUART_BASE;
                cken = CKEN_FFUART;
        } else if (0 == strcmp(kgdb_devname, "stuart")) {
                paddr = PXA2X0_STUART_BASE;
                cken = CKEN_STUART;
        } else if (0 == strcmp(kgdb_devname, "btuart")) {
                paddr = PXA2X0_BTUART_BASE;
                cken = CKEN_BTUART;
        } else if (0 == strcmp(kgdb_devname, "hwuart")) {
                paddr = PXA2X0_HWUART_BASE;
                cken = CKEN_HWUART;
        }

        if (paddr &&
            0 == com_kgdb_attach(&pxa2x0_a4x_bs_tag, paddr,
                kgdb_devrate, PXA2X0_COM_FREQ, COM_TYPE_PXA2x0, comkgdbmode)) {

                pxa2x0_clkman_config(cken, 1);
        }

#endif
}
#endif