/*      $NetBSD: netwinder_machdep.c,v 1.94 2025/12/22 07:45:47 skrll Exp $     */

/*
 * 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 dependent functions for kernel setup for EBSA285 core architecture
 * using Netwinder firmware
 *
 * Created      : 24/11/97
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netwinder_machdep.c,v 1.94 2025/12/22 07:45:47 skrll Exp $");

#include "opt_ddb.h"

#define _ARM32_BUS_DMA_PRIVATE

#include "isa.h"
#include "isadma.h"
#include "igsfb.h"
#include "pckbc.h"
#include "com.h"
#include "ksyms.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 <sys/bus.h>
#include <sys/cpu.h>
#include <sys/intr.h>

#include <uvm/uvm_extern.h>

#include <dev/cons.h>

#if NISA > 0
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#endif

#if NIGSFB > 0
#include <dev/pci/pcivar.h>
#include <dev/pci/igsfb_pcivar.h>
#endif

#if NPCKBC > 0
#include <dev/ic/i8042reg.h>
#include <dev/ic/pckbcvar.h>
#endif

#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>

#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>

#include <arm/arm32/machdep.h>

#include <machine/bootconfig.h>
#include <arm/locore.h>
#include <arm/undefined.h>

#include <machine/netwinder_boot.h>
#include <arm/footbridge/dc21285mem.h>
#include <arm/footbridge/dc21285reg.h>


static bus_space_handle_t isa_base = (bus_space_handle_t) DC21285_PCI_IO_VBASE;

bs_protos(generic);

#define ISA_GETBYTE(r)          generic_bs_r_1(0, isa_base, (r))
#define ISA_PUTBYTE(r,v)        generic_bs_w_1(0, isa_base, (r), (v))

static void netwinder_reset(void);

u_int dc21285_fclk = 63750000;

struct nwbootinfo nwbootinfo;
BootConfig bootconfig;          /* Boot config storage */
static char bootargs[MAX_BOOT_STRING + 1];
char *boot_args = NULL;
char *boot_file = NULL;

vaddr_t physical_start;
vaddr_t physical_freestart;
vaddr_t physical_freeend;
vaddr_t physical_end;
u_int free_pages;
vaddr_t pagetables_start;

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

paddr_t msgbufphys;

#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_VMDATA        2       /* 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];

#define KERNEL_VM_BASE          (KERNEL_BASE + 0x01000000)
/*
 * The range 0xf1000000 - 0xfcffffff is available for kernel VM space
 * Footbridge registers and I/O mappings occupy 0xfd000000 - 0xffffffff
 */
#if NIGSFB > 0
/* XXX: uwe: map 16 megs at 0xfc000000 for igsfb(4) */
#define KERNEL_VM_SIZE          0x0B000000
#else
#define KERNEL_VM_SIZE          0x0C000000
#endif

/* Prototypes */

void consinit(void);
void process_kernel_args(char *);
void data_abort_handler(trapframe_t *);
void prefetch_abort_handler(trapframe_t *);
void undefinedinstruction_bounce(trapframe_t *);


/* A load of console goo. */
#ifndef CONSDEVNAME
#  if (NIGSFB > 0) && (NPCKBC > 0)
#    define CONSDEVNAME "igsfb"
#  elif NCOM > 0
#    define CONSDEVNAME "com"
#  else
#    error CONSDEVNAME not defined and no known console device configured
#  endif
#endif /* !CONSDEVNAME */

#ifndef CONCOMADDR
#define CONCOMADDR 0x3f8
#endif

#ifndef CONSPEED
#define CONSPEED B115200        /* match NeTTrom */
#endif

#ifndef CONMODE
#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#endif

int comcnspeed = CONSPEED;
int comcnmode = CONMODE;

extern struct consdev kcomcons;
static void kcomcnputc(dev_t, int);

#if NIGSFB > 0
/* XXX: uwe */
#define IGS_PCI_MEM_VBASE               0xfc000000
#define IGS_PCI_MEM_VSIZE               0x01000000
#define IGS_PCI_MEM_BASE                0x08000000

extern struct arm32_pci_chipset footbridge_pci_chipset;
extern struct bus_space footbridge_pci_io_bs_tag;
extern struct bus_space footbridge_pci_mem_bs_tag;
extern void footbridge_pci_bs_tag_init(void);

/* standard methods */
extern bs_map_proto(footbridge_mem);
extern bs_unmap_proto(footbridge_mem);

/* our hooks */
static bs_map_proto(nw_footbridge_mem);
static bs_unmap_proto(nw_footbridge_mem);
#endif


/*
 * void cpu_reboot(int howto, char *bootstr)
 *
 * Reboots the system
 *
 * 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 curlwp=%p\n", howto, curlwp);
#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*/
        }

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

        /*
         * 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*/
}

/*
 * NB: this function runs with MMU disabled!
 */
static void
netwinder_reset(void)
{
        register u_int base = DC21285_PCI_IO_BASE;

#define PUTBYTE(reg, val) \
        *((volatile u_int8_t *)(base + (reg))) = (val)

        PUTBYTE(0x338, 0x84);   /* Red led(GP17), fan on(GP12) */
        PUTBYTE(0x370, 0x87);   /* Enter the extended function mode */
        PUTBYTE(0x370, 0x87);   /* (need to write the magic twice) */
        PUTBYTE(0x370, 0x07);   /* Select Logical Device Number reg */
        PUTBYTE(0x371, 0x07);   /* Select Logical Device 7 (GPIO) */
        PUTBYTE(0x370, 0xe6);   /* Select GP16 Control Reg */
        PUTBYTE(0x371, 0x00);   /* Make GP16 an output */
        PUTBYTE(0x338, 0xc4);   /* RESET(GP16), red led, fan on */
}

/*
 * Mapping table for core kernel memory. This memory is mapped at init
 * time with section mappings.
 */
struct l1_sec_map {
        vaddr_t         va;
        vaddr_t         pa;
        vsize_t         size;
        vm_prot_t       prot;
        int             cache;
} l1_sec_table[] = {
        /* Map 1MB for CSR space */
        { DC21285_ARMCSR_VBASE,                 DC21285_ARMCSR_BASE,
            DC21285_ARMCSR_VSIZE,               VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 1MB for fast cache cleaning space */
        { DC21285_CACHE_FLUSH_VBASE,            DC21285_SA_CACHE_FLUSH_BASE,
            DC21285_CACHE_FLUSH_VSIZE,          VM_PROT_READ|VM_PROT_WRITE,
            PTE_CACHE },

        /* Map 1MB for PCI IO space */
        { DC21285_PCI_IO_VBASE,                 DC21285_PCI_IO_BASE,
            DC21285_PCI_IO_VSIZE,               VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 1MB for PCI IACK space */
        { DC21285_PCI_IACK_VBASE,               DC21285_PCI_IACK_SPECIAL,
            DC21285_PCI_IACK_VSIZE,             VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 16MB of type 1 PCI config access */
        { DC21285_PCI_TYPE_1_CONFIG_VBASE,      DC21285_PCI_TYPE_1_CONFIG,
            DC21285_PCI_TYPE_1_CONFIG_VSIZE,    VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 16MB of type 0 PCI config access */
        { DC21285_PCI_TYPE_0_CONFIG_VBASE,      DC21285_PCI_TYPE_0_CONFIG,
            DC21285_PCI_TYPE_0_CONFIG_VSIZE,    VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 1MB of 32 bit PCI address space for ISA MEM accesses via PCI */
        { DC21285_PCI_ISA_MEM_VBASE,            DC21285_PCI_MEM_BASE,
            DC21285_PCI_ISA_MEM_VSIZE,          VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

#if NIGSFB > 0
        /* XXX: uwe: Map 16MB of PCI address space for CyberPro as console */
        { IGS_PCI_MEM_VBASE,    DC21285_PCI_MEM_BASE + IGS_PCI_MEM_BASE,
            IGS_PCI_MEM_VSIZE,                  VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },
#endif

        { 0, 0, 0, 0, 0 }
};

/*
 * vaddr_t 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
 */

vaddr_t
initarm(void *arg)
{
        int loop;
        int loop1;
        u_int l1pagetable;
        extern char _end[];

        /*
         * Turn the led off, then turn it yellow.
         * 0x80 - red; 0x04 - fan; 0x02 - green.
         */
        ISA_PUTBYTE(0x338, 0x04);
        ISA_PUTBYTE(0x338, 0x86);

        /*
         * Set up a diagnostic console so we can see what's going
         * on.
         */
        cn_tab = &kcomcons;

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

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

        /*
         * We are currently running with the MMU enabled and the
         * entire address space mapped VA==PA, except for the
         * first 64MB of RAM is also double-mapped at 0xf0000000.
         * There is an L1 page table at 0x00008000.
         *
         * We also have the 21285's PCI I/O space mapped where
         * we expect it.
         */

        printf("initarm: Configuring system ...\n");

        /*
         * Copy out the boot info passed by the firmware.  Note that
         * early versions of NeTTrom fill this in with bogus values,
         * so we need to sanity check it.
         */
        memcpy(&nwbootinfo, (void *)(KERNEL_BASE + 0x100),
            sizeof(nwbootinfo));
#ifdef VERBOSE_INIT_ARM
        printf("NeTTrom boot info:\n");
        printf("\tpage size = 0x%08lx\n", nwbootinfo.bi_pagesize);
        printf("\tnpages = %ld (0x%08lx)\n", nwbootinfo.bi_nrpages,
            nwbootinfo.bi_nrpages);
        printf("\trootdev = 0x%08lx\n", nwbootinfo.bi_rootdev);
        printf("\tcmdline = %s\n", nwbootinfo.bi_cmdline);
#endif
        if (nwbootinfo.bi_nrpages != 0x02000 &&
            nwbootinfo.bi_nrpages != 0x04000 &&
            nwbootinfo.bi_nrpages != 0x08000 &&
            nwbootinfo.bi_nrpages != 0x10000) {
                nwbootinfo.bi_pagesize = 0xdeadbeef;
                nwbootinfo.bi_nrpages = 0x01000;        /* 16MB */
                nwbootinfo.bi_rootdev = 0;
        }

        /* 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 = 0;
        bootconfig.dram[0].pages = nwbootinfo.bi_nrpages;

        /*
         * Set up the variables that define the availability of
         * physical memory.
         *
         * Since the NetWinder NeTTrom doesn't load ELF symbols
         * for us, we can safely assume that everything after end[]
         * is free.  We start there and allocate upwards.
         */
        physical_start = bootconfig.dram[0].address;
        physical_end = physical_start + (bootconfig.dram[0].pages * PAGE_SIZE);

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

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

        physmem = (physical_end - physical_start) / PAGE_SIZE;

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

        /*
         * Okay, 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 - physical_start;

#define alloc_pages(var, np)                    \
        (var) = physical_freestart;             \
        physical_freestart += ((np) * PAGE_SIZE);\
        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_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.
         */
        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);

#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

        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, 0x00000000,
            &kernel_pt_table[KERNEL_PT_SYS]);
        pmap_link_l2pt(l1pagetable, KERNEL_BASE,
            &kernel_pt_table[KERNEL_PT_KERNEL]);
        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 */
        {
                /*
                 * The kernel starts in the first 1MB of RAM, and we'd
                 * like to use a section mapping for text, so we'll just
                 * map from KERNEL_BASE to etext[] to _end[].
                 */

                extern char etext[];
                size_t textsize = (uintptr_t) etext - KERNEL_BASE;
                size_t totalsize = (uintptr_t) _end - KERNEL_BASE;
                u_int logical;

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

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

                logical = 0;            /* offset into 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 vector page. */
        pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);

        /*
         * Map devices we can map w/ section mappings.
         */
        loop = 0;
        while (l1_sec_table[loop].size) {
                vsize_t sz;

#ifdef VERBOSE_INIT_ARM
                printf("%08lx -> %08lx @ %08lx\n", l1_sec_table[loop].pa,
                    l1_sec_table[loop].pa + l1_sec_table[loop].size - 1,
                    l1_sec_table[loop].va);
#endif
                for (sz = 0; sz < l1_sec_table[loop].size; sz += L1_S_SIZE)
                        pmap_map_section(l1pagetable,
                            l1_sec_table[loop].va + sz,
                            l1_sec_table[loop].pa + sz,
                            l1_sec_table[loop].prot,
                            l1_sec_table[loop].cache);
                ++loop;
        }

        /*
         * 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.
         */

        /* 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_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
        cpu_setttb(kernel_l1pt.pv_pa, true);
        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("done!\n");
#endif

        /*
         * XXX this should only be done in main() but it useful to
         * have output earlier ...
         */
        consinit();

#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.
         */
        printf("init subsystems: stacks ");

        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.
         */
        printf("vectors ");
        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 */
        printf("undefined ");
        undefined_init();

        /* Load memory into UVM. */
        printf("page ");
        uvm_md_init();

        /* XXX Always one RAM block -- nuke the loop. */
        for (loop = 0; loop < bootconfig.dramblocks; loop++) {
                paddr_t start = (paddr_t)bootconfig.dram[loop].address;
                paddr_t end = start + (bootconfig.dram[loop].pages * PAGE_SIZE);
#if NISADMA > 0
                paddr_t istart, isize;
                extern struct arm32_dma_range *footbridge_isa_dma_ranges;
                extern int footbridge_isa_dma_nranges;
#endif

                if (start < physical_freestart)
                        start = physical_freestart;
                if (end > physical_freeend)
                        end = physical_freeend;

#if 0
                printf("%d: %lx -> %lx\n", loop, start, end - 1);
#endif

#if NISADMA > 0
                if (arm32_dma_range_intersect(footbridge_isa_dma_ranges,
                                              footbridge_isa_dma_nranges,
                                              start, end - start,
                                              &istart, &isize)) {
                        /*
                         * Place the pages that intersect with the
                         * ISA DMA range onto the ISA DMA free list.
                         */
#if 0
                        printf("    ISADMA 0x%lx -> 0x%lx\n", istart,
                            istart + isize - 1);
#endif
                        uvm_page_physload(atop(istart),
                            atop(istart + isize), atop(istart),
                            atop(istart + isize), VM_FREELIST_ISADMA);

                        /*
                         * Load the pieces that come before the
                         * intersection onto the default free list.
                         */
                        if (start < istart) {
#if 0
                                printf("    BEFORE 0x%lx -> 0x%lx\n",
                                    start, istart - 1);
#endif
                                uvm_page_physload(atop(start),
                                    atop(istart), atop(start),
                                    atop(istart), VM_FREELIST_DEFAULT);
                        }

                        /*
                         * Load the pieces that come after the
                         * intersection onto the default free list.
                         */
                        if ((istart + isize) < end) {
#if 0
                                printf("     AFTER 0x%lx -> 0x%lx\n",
                                    (istart + isize), end - 1);
#endif
                                uvm_page_physload(atop(istart + isize),
                                    atop(end), atop(istart + isize),
                                    atop(end), VM_FREELIST_DEFAULT);
                        }
                } else {
                        uvm_page_physload(atop(start), atop(end),
                            atop(start), atop(end), VM_FREELIST_DEFAULT);
                }
#else /* NISADMA > 0 */
                uvm_page_physload(atop(start), atop(end),
                    atop(start), atop(end), VM_FREELIST_DEFAULT);
#endif /* NISADMA > 0 */
        }

        /* Boot strap pmap telling it where managed kernel virtual memory is */
        printf("pmap ");
        pmap_bootstrap(KERNEL_VM_BASE, KERNEL_VM_BASE + KERNEL_VM_SIZE);

        /* Now that pmap is inited, we can set cpu_reset_address */
        cpu_reset_address_paddr = vtophys((vaddr_t)netwinder_reset);

        /* Setup the IRQ system */
        printf("irq ");
        footbridge_intr_init();
        printf("done.\n");

        /*
         * Warn the user if the bootinfo was bogus.  We already
         * faked up some safe values.
         */
        if (nwbootinfo.bi_pagesize == 0xdeadbeef)
                printf("WARNING: NeTTrom boot info corrupt\n");

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

        /* Turn the led green */
        ISA_PUTBYTE(0x338, 0x06);

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

void
process_kernel_args(char *args)
{

        boothowto = 0;

        /* Make a local copy of the bootargs */
        strncpy(bootargs, args, MAX_BOOT_STRING);

        args = bootargs;
        boot_file = bootargs;

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

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

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

        boot_args = args;

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

        parse_mi_bootargs(boot_args);
}

void
consinit(void)
{
        static int consinit_called = 0;
        const char *console = CONSDEVNAME;

        if (consinit_called != 0)
                return;

        consinit_called = 1;

#ifdef DIAGNOSTIC
        printf("consinit(\"%s\")\n", console);
#endif

#if NISA > 0
        /* Initialise the ISA subsystem early ... */
        isa_footbridge_init(DC21285_PCI_IO_VBASE, DC21285_PCI_ISA_MEM_VBASE);
#endif

        if (strncmp(console, "igsfb", 5) == 0) {
#if NIGSFB > 0
                int res;

                footbridge_pci_bs_tag_init();

                /*
                 * XXX: uwe: special case mapping for the igsfb memory space.
                 *
                 * The problem with this is that when footbridge is
                 * attached during normal autoconfiguration the bus
                 * space tags will be reinited and these hooks lost.
                 * However, since igsfb(4) don't unmap memory during
                 * normal operation, this is ok.  But if the igsfb is
                 * configured but is not a console, we waste 16M of
                 * kernel VA space.
                 */
                footbridge_pci_mem_bs_tag.bs_map = nw_footbridge_mem_bs_map;
                footbridge_pci_mem_bs_tag.bs_unmap = nw_footbridge_mem_bs_unmap;

                igsfb_pci_cnattach(&footbridge_pci_io_bs_tag,
                                   &footbridge_pci_mem_bs_tag,
                                   &footbridge_pci_chipset,
                                   0, 8, 0);
#if NPCKBC > 0
                res = pckbc_cnattach(&isa_io_bs_tag,
                                     IO_KBD, KBCMDP, PCKBC_KBD_SLOT, 0);
                if (res)
                        printf("pckbc_cnattach: %d!\n", res);
#endif
#else
                panic("igsfb console not configured");
#endif /* NIGSFB */
        } else {
#ifdef DIAGNOSTIC
                if (strncmp(console, "com", 3) != 0) {
                        printf("consinit: unknown CONSDEVNAME=\"%s\","
                               " falling back to \"com\"\n", console);
                }
#endif
#if NCOM > 0
                if (comcnattach(&isa_io_bs_tag, CONCOMADDR, comcnspeed,
                                COM_FREQ, COM_TYPE_NORMAL, comcnmode))
                        panic("can't init serial console @%x", CONCOMADDR);
#else
                panic("serial console @%x not configured", CONCOMADDR);
#endif
        }
}


#if NIGSFB > 0
static int
nw_footbridge_mem_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable, bus_space_handle_t *bshp)
{
        bus_addr_t startpa, endpa;

        /* Round the allocation to page boundaries */
        startpa = trunc_page(bpa);
        endpa = round_page(bpa + size);

        /*
         * Check for mappings of the igsfb(4) memory space as we have
         * this space already mapped.
         */
        if (startpa >= IGS_PCI_MEM_BASE
            && endpa < (IGS_PCI_MEM_BASE + IGS_PCI_MEM_VSIZE)) {
                /* Store the bus space handle */
                *bshp =  IGS_PCI_MEM_VBASE
                        + (bpa - IGS_PCI_MEM_BASE);
#ifdef DEBUG
                printf("nw/mem_bs_map: %08x+%08x: %08x..%08x -> %08x\n",
                       (u_int32_t)bpa, (u_int32_t)size,
                       (u_int32_t)startpa, (u_int32_t)endpa,
                       (u_int32_t)*bshp);
#endif
                return 0;
        }

        return (footbridge_mem_bs_map(t, bpa, size, cacheable, bshp));
}


static void
nw_footbridge_mem_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
{

        /*
         * Check for mappings of the igsfb(4) memory space as we have
         * this space already mapped.
         */
        if (bsh >= IGS_PCI_MEM_VBASE
            && bsh < (IGS_PCI_MEM_VBASE + IGS_PCI_MEM_VSIZE)) {
#ifdef DEBUG
                printf("nw/bs_unmap: 0x%08x\n", (u_int32_t)bsh);
#endif
                return;
        }

        footbridge_mem_bs_unmap(t, bsh, size);
}
#endif /* NIGSFB */


static bus_space_handle_t kcom_base = (bus_space_handle_t) (DC21285_PCI_IO_VBASE + CONCOMADDR);

#define KCOM_GETBYTE(r)         generic_bs_r_1(0, kcom_base, (r))
#define KCOM_PUTBYTE(r,v)       generic_bs_w_1(0, kcom_base, (r), (v))

static int
kcomcngetc(dev_t dev)
{
        int stat, c;

        /* block until a character becomes available */
        while (!ISSET(stat = KCOM_GETBYTE(com_lsr), LSR_RXRDY))
                ;

        c = KCOM_GETBYTE(com_data);
        stat = KCOM_GETBYTE(com_iir);
        return c;
}

/*
 * Console kernel output character routine.
 */
static void
kcomcnputc(dev_t dev, int c)
{
        int timo;

        /* wait for any pending transmission to finish */
        timo = 150000;
        while (!ISSET(KCOM_GETBYTE(com_lsr), LSR_TXRDY) && --timo)
                continue;

        KCOM_PUTBYTE(com_data, c);

        /* wait for this transmission to complete */
        timo = 1500000;
        while (!ISSET(KCOM_GETBYTE(com_lsr), LSR_TXRDY) && --timo)
                continue;
}

static void
kcomcnpollc(dev_t dev, int on)
{
}

struct consdev kcomcons = {
        NULL, NULL, kcomcngetc, kcomcnputc, kcomcnpollc, NULL,
        NULL, NULL, NODEV, CN_NORMAL
};