/*      $NetBSD: rpc_machdep.c,v 1.102 2025/12/22 07:45:46 skrll Exp $  */

/*
 * Copyright (c) 2000-2002 Reinoud Zandijk.
 * Copyright (c) 1994-1998 Mark Brinicombe.
 * Copyright (c) 1994 Brini.
 * All rights reserved.
 *
 * This code is derived from software written for Brini by Mark Brinicombe
 *
 * 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 Brini.
 * 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 BRINI ``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 BRINI 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.
 *
 * RiscBSD kernel project
 *
 * machdep.c
 *
 * Machine dependent functions for kernel setup
 *
 * This file still needs a lot of work
 *
 * Created      : 17/09/94
 * Updated for yet another new bootloader 28/12/02
 */

#include "opt_ddb.h"
#include "opt_modular.h"
#include "vidcvideo.h"
#include "podulebus.h"

#include <sys/param.h>

__KERNEL_RCSID(0, "$NetBSD: rpc_machdep.c,v 1.102 2025/12/22 07:45:46 skrll Exp $");

#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/proc.h>
#include <sys/msgbuf.h>
#include <sys/exec.h>
#include <sys/exec_aout.h>
#include <sys/ksyms.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/intr.h>
#include <sys/device.h>

#include <dev/cons.h>

#include <dev/ic/pckbcvar.h>

#include <dev/i2c/i2cvar.h>
#include <dev/i2c/pcf8583var.h>

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

#include <uvm/uvm.h>

#include <arm/locore.h>
#include <arm/undefined.h>
#include <arm/arm32/machdep.h>
#include <arm/arm32/pmap.h>

#include <machine/rtc.h>
#include <machine/signal.h>
#include <machine/bootconfig.h>
#include <machine/io.h>

#include <arm/iomd/vidc.h>
#include <arm/iomd/iomdreg.h>
#include <arm/iomd/iomdvar.h>
#include <arm/iomd/vidcvideo.h>
#include <arm/iomd/iomdiicvar.h>

static i2c_tag_t acorn32_i2c_tag;

#include "ksyms.h"

/* Kernel text starts at the base of the kernel address space. */
#define KERNEL_TEXT_BASE        (KERNEL_BASE + 0x00000000)
#define KERNEL_VM_BASE          (KERNEL_BASE + 0x01000000)

/*
 * The range 0xf1000000 - 0xf5ffffff is available for kernel VM space
 * Fixed mappings exist from 0xf6000000 - 0xffffffff
 */
#define KERNEL_VM_SIZE          0x05000000

struct bootconfig bootconfig;   /* Boot config storage */
videomemory_t videomemory;      /* Video memory descriptor */

char *boot_args = NULL;         /* holds the pre-processed boot arguments */
extern char *booted_kernel;     /* used for ioctl to retrieve booted kernel */

extern int       *vidc_base;
extern uint32_t  iomd_base;
extern struct bus_space iomd_bs_tag;

paddr_t physical_start;
paddr_t kernel_start;
paddr_t physical_freestart;
paddr_t physical_freeend;
paddr_t physical_end;
paddr_t dma_range_begin;
paddr_t dma_range_end;

u_int free_pages;
paddr_t memoryblock_end;

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

u_int videodram_size = 0;       /* Amount of DRAM to reserve for video */

paddr_t msgbufphys;

#define KERNEL_PT_VMEM          0 /* Page table for mapping video memory */
#define KERNEL_PT_SYS           1 /* Page table for mapping proc0 zero page */
#define KERNEL_PT_KERNEL        2 /* Page table for mapping kernel 0-4MB*/
#define KERNEL_PT_KERNEL_4MB    3 /* Page table for mapping kernel 4-8MB*/
#define KERNEL_PT_VMDATA        4 /* 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];

#ifdef CPU_SA110
#define CPU_SA110_CACHE_CLEAN_SIZE (0x4000 * 2)
static vaddr_t sa110_cc_base;
#endif  /* CPU_SA110 */

/* Prototypes */
void physcon_display_base(u_int);
extern void consinit(void);

void data_abort_handler(trapframe_t *);
void prefetch_abort_handler(trapframe_t *);
void undefinedinstruction_bounce(trapframe_t *frame);

static void canonicalise_bootconfig(struct bootconfig *, struct bootconfig *);
static void process_kernel_args(void);

extern void dump_spl_masks(void);

void rpc_sa110_cc_setup(void);

void parse_rpc_bootargs(char *args);

extern void dumpsys(void);


#       define console_flush()          /* empty */


#define panic2(a) do {                                                  \
        memset((void *) (videomemory.vidm_vbase), 0x55, 50*1024);       \
        consinit();                                                     \
        panic a;                                                        \
} while (/* CONSTCOND */ 0)

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

/* NOTE: These variables will be removed, well some of them */

extern u_int current_mask;

void
cpu_reboot(int howto, char *bootstr)
{

#ifdef DIAGNOSTIC
        printf("boot: howto=%08x curlwp=%p\n", howto, curlwp);

        printf("ipl_bio=%08x ipl_net=%08x ipl_tty=%08x ipl_vm=%08x\n",
            irqmasks[IPL_BIO], irqmasks[IPL_NET], irqmasks[IPL_TTY],
            irqmasks[IPL_VM]);
        printf("ipl_audio=%08x ipl_clock=%08x ipl_none=%08x\n",
            irqmasks[IPL_AUDIO], irqmasks[IPL_CLOCK], irqmasks[IPL_NONE]);

        dump_spl_masks();
#endif  /* DIAGNOSTIC */

        /*
         * If we are still cold then hit the air brakes
         * and crash to earth fast
         */
        if (cold) {
                doshutdownhooks();
                pmf_system_shutdown(boothowto);
                printf("Halted while still in the ICE age.\n");
                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();

        /*
         * Auto reboot overload protection
         *
         * This code stops the kernel entering an endless loop of reboot
         * - panic cycles. This will have the effect of stopping further
         * reboots after it has rebooted 8 times after panics. A clean
         * halt or reboot will reset the counter.
         */

        /*
         * Have we done 8 reboots in a row ? If so halt rather than reboot
         * since 8 panics in a row without 1 clean halt means something is
         * seriously wrong.
         */
        if (cmos_read(RTC_ADDR_REBOOTCNT) > 8)
                howto |= RB_HALT;

        /*
         * If we are rebooting on a panic then up the reboot count
         * otherwise reset.
         * This will thus be reset if the kernel changes the boot action from
         * reboot to halt due to too any reboots.
         */
        if (((howto & RB_HALT) == 0) && panicstr)
                cmos_write(RTC_ADDR_REBOOTCNT,
                   cmos_read(RTC_ADDR_REBOOTCNT) + 1);
        else
                cmos_write(RTC_ADDR_REBOOTCNT, 0);

        /*
         * If we need a RiscBSD reboot, request it buy setting a bit in
         * the CMOS RAM. This can be detected by the RiscBSD boot loader
         * during a RISCOS boot. No other way to do this as RISCOS is in ROM.
         */
        if ((howto & RB_HALT) == 0)
                cmos_write(RTC_ADDR_BOOTOPTS,
                    cmos_read(RTC_ADDR_BOOTOPTS) | 0x02);

        /* 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*/
}


/*
 * u_int initarm(BootConfig *bootconf)
 *
 * 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
 */

/*
 * this part is completely rewritten for the new bootloader ... It features
 * a flat memory map with a mapping comparable to the EBSA arm32 machine
 * to boost the portability and likeness of the code
 */

/*
 * Mapping table for core kernel memory. This memory is mapped at init
 * time with section mappings.
 *
 * XXX One big assumption in the current architecture seems that the kernel is
 * XXX supposed to be mapped into bootconfig.dram[0].
 */

#define ONE_MB  0x100000

struct l1_sec_map {
        vaddr_t         va;
        paddr_t         pa;
        vsize_t         size;
        vm_prot_t       prot;
        int             cache;
} l1_sec_table[] = {
        /* Map 1Mb section for VIDC20 */
        { VIDC_BASE,            VIDC_HW_BASE,
            ONE_MB,             VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 1Mb section from IOMD */
        { IOMD_BASE,            IOMD_HW_BASE,
            ONE_MB,             VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },

        /* Map 1Mb of COMBO (and module space) */
        { IO_BASE,              IO_HW_BASE,
            ONE_MB,             VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },
#if NPODULEBUS > 0      /* XXXJRT */
        /* Map the Fast and Sync simple podule space */
        { SYNC_PODULE_BASE & 0xfff00000, SYNC_PODULE_HW_BASE & 0xfff00000,
            L1_S_SIZE,          VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },
        /* Map the EASI podule space */
        { EASI_BASE,            EASI_HW_BASE,
            MAX_PODULES * EASI_SIZE,    VM_PROT_READ|VM_PROT_WRITE,
            PTE_NOCACHE },
#endif
        { 0, 0, 0, 0, 0 }
};


static void
canonicalise_bootconfig(struct bootconfig *bootconf, struct bootconfig *raw_bootconf)
{
        /* check for bootconfig v2+ structure */
        if (raw_bootconf->magic == BOOTCONFIG_MAGIC) {
                /* v2+ cleaned up structure found */
                *bootconf = *raw_bootconf;
                return;
        } else {
                panic2(("Internal error: no valid bootconfig block found"));
        }
}


vaddr_t
initarm(void *cookie)
{
        struct bootconfig *raw_bootconf = cookie;
        int loop;
        int loop1;
        u_int logical;
        u_int kerneldatasize;
        u_int l1pagetable;
        struct exec *kernexec = (struct exec *)KERNEL_TEXT_BASE;
        bool hasKinetic = false;
        paddr_t kinetic_physical_start;

        /*
         * Heads up ... Setup the CPU / MMU / TLB functions
         */
        set_cpufuncs();

        /* canonicalise the boot configuration structure to allow versioning */
        canonicalise_bootconfig(&bootconfig, raw_bootconf);
        booted_kernel = bootconfig.kernelname;

        /* if the wscons interface is used, switch off VERBOSE booting :( */
#if NVIDCVIDEO>0
#       undef VERBOSE_INIT_ARM
#endif

        /*
         * Initialise the video memory descriptor
         *
         * Note: all references to the video memory virtual/physical address
         * should go via this structure.
         */

        /* Hardwire it on the place the bootloader tells us */
        videomemory.vidm_vbase = bootconfig.display_start;
        videomemory.vidm_pbase = bootconfig.display_phys;
        videomemory.vidm_size = bootconfig.display_size;
        if (bootconfig.vram[0].pages)
                videomemory.vidm_type = VIDEOMEM_TYPE_VRAM;
        else
                videomemory.vidm_type = VIDEOMEM_TYPE_DRAM;
        vidc_base = (int *) VIDC_HW_BASE;
        iomd_base =         IOMD_HW_BASE;

        /*
         * Initialise the physical console
         * This is done in main() but for the moment we do it here so that
         * we can use printf in initarm() before main() has been called.
         * only for `vidcconsole!' ... not wscons
         */
#if NVIDCVIDEO == 0
        consinit();
#endif

        /*
         * Initialise the diagnostic serial console
         * This allows a means of generating output during initarm().
         * Once all the memory map changes are complete we can call consinit()
         * and not have to worry about things moving.
         */
        /* fcomcnattach(DC21285_ARMCSR_BASE, comcnspeed, comcnmode); */
        /* XXX snif .... i am still not able to this */

        /*
         * We have the following memory map (derived from EBSA)
         *
         * virtual address == physical address apart from the areas:
         * 0x00000000 -> 0x000fffff which is mapped to
         * top 1MB of physical memory
         * 0xf0000000 -> 0xf0ffffff which is mapped to
         * physical address 0x10000000 -> 0x10ffffff
         * or on a Kinetic:
         * physical address 0x20400000 -> 0x20ffffff
         *
         * This means that the kernel is mapped suitably for continuing
         * execution, all I/O is mapped 1:1 virtual to physical and
         * physical memory is accessible.
         *
         * The initarm() has the responsibility for creating the kernel
         * page tables.
         * It must also set up various memory pointers that are used
         * by pmap etc.
         */

#ifdef FORCE_VERBOSE_INIT_ARM
        /*
         * note that this will stop working after we switch to the new
         * L1 Table
         */
        memset((void *) (videomemory.vidm_vbase), 0x55, videomemory.vidm_size);
        consinit();
        printf("\n\n\n\n\n\n\n");
#define VERBOSE_INIT_ARM
#endif
        /* START OF REAL NEW STUFF */

        /* Check to make sure the page size is correct */
        if (PAGE_SIZE != bootconfig.pagesize)
                panic2(("Page size is %d bytes instead of %d !! (huh?)\n",
                           bootconfig.pagesize, PAGE_SIZE));

        /* process arguments */
        process_kernel_args();

        /*
         * Now set up the page tables for the kernel ... this part is copied
         * in a (modified?) way from the EBSA machine port....
         */

#ifdef VERBOSE_INIT_ARM
        printf("Allocating page tables\n");
#endif
        /*
         * Set up the variables that define the availability of physical
         * memory
         */
        physical_start = 0xffffffff;
        physical_end = 0;
        kinetic_physical_start = 0xffffffff;
#ifdef VERBOSE_INIT_ARM
        printf("memory blocks:\n");
#endif
        for (loop = 0, physmem = 0; loop < bootconfig.dramblocks; ++loop) {
#ifdef VERBOSE_INIT_ARM
                printf("0x%x + 0x%0x, type = 0x%08x\n", bootconfig.dram[loop].address,
                                 bootconfig.dram[loop].pages * PAGE_SIZE,
                                 bootconfig.dram[loop].flags);
#endif
                if (bootconfig.dram[loop].address < physical_start)
                        physical_start = bootconfig.dram[loop].address;
                memoryblock_end = bootconfig.dram[loop].address +
                    bootconfig.dram[loop].pages * PAGE_SIZE;
                if (memoryblock_end > physical_end)
                        physical_end = memoryblock_end;
                physmem += bootconfig.dram[loop].pages;
                if (bootconfig.dram[loop].flags & PHYSMEM_TYPE_PROCESSOR_ONLY) {
                        hasKinetic = true;
                        if (bootconfig.dram[loop].address < kinetic_physical_start)
                                kinetic_physical_start = bootconfig.dram[loop].address;
                }
        };

        if (hasKinetic)
        {
                /* Kinetics can only DMA from the Normal DRAM */
                dma_range_begin = 0xffffffff;
                dma_range_end = 0;
                for (loop = 0; loop < bootconfig.dramblocks; ++loop) {
                        if (bootconfig.dram[loop].flags == PHYSMEM_TYPE_GENERIC) {
                                if (bootconfig.dram[loop].address < dma_range_begin)
                                        dma_range_begin = bootconfig.dram[loop].address;
                                memoryblock_end = bootconfig.dram[loop].address +
                                        bootconfig.dram[loop].pages * PAGE_SIZE;
                                if (memoryblock_end > dma_range_end)
                                        dma_range_end = memoryblock_end;
                        }
                }
                dma_range_end   = (paddr_t) MIN(dma_range_end, 256*1024*1024);
        } else {
                /* everything else DMAs all the memory */
                dma_range_begin = (paddr_t) physical_start;
                dma_range_end   = (paddr_t) MIN(physical_end, 512*1024*1024);
        }

        /* set the location of the kernel in physical memory */
        if (hasKinetic) {
                kernel_start = kinetic_physical_start;
        } else {
                kernel_start = physical_start;
        }
        physical_freestart = kernel_start;
        free_pages = bootconfig.drampages;
        physical_freeend = physical_end;

        /*
         * AHUM !! set this variable ... it was set up in the old 1st
         * stage bootloader
         */
        kerneldatasize = bootconfig.kernsize + bootconfig.MDFsize;

        /* Update the address of the first free page of physical memory */
        physical_freestart +=
            bootconfig.kernsize + bootconfig.scratchsize;
        free_pages -= (bootconfig.kernsize + bootconfig.scratchsize) / PAGE_SIZE;

        /* 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 - kernel_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;
                }
        }


#ifdef DIAGNOSTIC
        /* 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)
                panic2(("initarm: Failed to align the kernel page "
                    "directory\n"));
#endif

        /*
         * 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("Setting up stacks :\n");
        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);
        printf("\n");
#endif

        alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / PAGE_SIZE);

#ifdef CPU_SA110
        /*
         * XXX totally stuffed hack to work round problems introduced
         * in recent versions of the pmap code. Due to the calls used there
         * we cannot allocate virtual memory during bootstrap.
         */
        sa110_cc_base = (KERNEL_BASE + (physical_freestart - kernel_start)
            + (CPU_SA110_CACHE_CLEAN_SIZE - 1))
            & ~(CPU_SA110_CACHE_CLEAN_SIZE - 1);
#endif  /* CPU_SA110 */

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

#ifdef VERBOSE_INIT_ARM
        printf("Creating L1 page table p@0x%08x\n", (uint32_t)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]);
        pmap_link_l2pt(l1pagetable, KERNEL_BASE + 0x00400000,
            &kernel_pt_table[KERNEL_PT_KERNEL_4MB]);
        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]);
        pmap_link_l2pt(l1pagetable, VMEM_VBASE,
            &kernel_pt_table[KERNEL_PT_VMEM]);

        /* 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 code/data */
        /* XXX Kernel doesn't have to be on physical_start (!) use bootconfig XXX */
        /*
         * The defines are a workaround for a recent problem that occurred
         * with ARM 610 processors and some ARM 710 processors
         * Other ARM 710 and StrongARM processors don't have a problem.
         */
        if (N_GETMAGIC(kernexec[0]) == ZMAGIC) {
#if defined(CPU_ARM6) || defined(CPU_ARM7)
                logical = pmap_map_chunk(l1pagetable, KERNEL_TEXT_BASE,
                    kernel_start, kernexec->a_text,
                    VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
#else   /* CPU_ARM6 || CPU_ARM7 */
                logical = pmap_map_chunk(l1pagetable, KERNEL_TEXT_BASE,
                    kernel_start, kernexec->a_text,
                    VM_PROT_READ, PTE_CACHE);
#endif  /* CPU_ARM6 || CPU_ARM7 */
                logical += pmap_map_chunk(l1pagetable,
                    KERNEL_TEXT_BASE + logical, kernel_start + logical,
                    kerneldatasize - kernexec->a_text,
                    VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
        } else {        /* !ZMAGIC */
                /*
                 * Most likely an ELF kernel ...
                 * XXX no distinction yet between read only and
                 * read/write area's ...
                 */
                pmap_map_chunk(l1pagetable, KERNEL_TEXT_BASE,
                    kernel_start, kerneldatasize,
                    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);
        }

        /* Now we fill in the L2 pagetable for the VRAM */
        /*
         * Current architectures mean that the VRAM is always in 1
         * continuous bank.  This means that we can just map the 2 meg
         * that the VRAM would occupy.  In theory we don't need a page
         * table for VRAM, we could section map it but we would need
         * the page tables if DRAM was in use.
         * XXX please map two adjacent virtual areas to ONE physical
         * area
         */
        pmap_map_chunk(l1pagetable, VMEM_VBASE, videomemory.vidm_pbase,
            videomemory.vidm_size, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
        pmap_map_chunk(l1pagetable, VMEM_VBASE + videomemory.vidm_size,
            videomemory.vidm_pbase, videomemory.vidm_size,
            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);

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

        /* Map the core memory needed before autoconfig */
        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.
         */

        /* be a client to all domains */
        cpu_domains(0x55555555);

        /* Switch tables */
#ifdef VERBOSE_INIT_ARM
        printf("switching to new L1 page table\n");
#endif

        cpu_setttb(kernel_l1pt.pv_pa, true);

        /*
         * We must now clean the cache again....
         * Cleaning may be done by reading new data to displace any
         * dirty data in the cache. This will have happened in cpu_setttb()
         * but since we are boot strapping the addresses used for the read
         * may have just been remapped and thus the cache could be out
         * of sync. A re-clean after the switch will cure this.
         * After booting there are no gross relocations of the kernel thus
         * this problem will not occur after initarm().
         */
        cpu_idcache_wbinv_all();
        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);

        /*
         * if there is support for a serial console ...we should now
         * reattach it
         */
        /*      fcomcndetach();*/

        /*
         * Reflect videomemory relocation in the videomemory structure
         * and reinit console
         */
        if (bootconfig.vram[0].pages == 0) {
                videomemory.vidm_vbase   = VMEM_VBASE;
        } else {
                videomemory.vidm_vbase   = VMEM_VBASE;
                bootconfig.display_start = VMEM_VBASE;
        };
        vidc_base = (int *) VIDC_BASE;
        iomd_base =         IOMD_BASE;

#ifdef FORCE_VERBOSE_INIT_ARM2
        consinit();
        printf("\n\n\n\n\n\n\n");
#define VERBOSE_INIT_ARM
#endif

#ifdef VERBOSE_INIT_ARM
        printf("running on the new L1 page table!\n");
        printf("done.\n");
#endif

        arm32_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL);

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

        /*
         * 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 ");
        console_flush();
#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);
#ifdef VERBOSE_INIT_ARM
        printf("kstack V%08lx P%08lx\n", kernelstack.pv_va,
            kernelstack.pv_pa);
#endif  /* VERBOSE_INIT_ARM */

        /*
         * 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.
         */
#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;
        console_flush();


        /*
         * At last !
         * We now have the kernel in physical memory from the bottom upwards.
         * Kernel page tables are physically above this.
         * The kernel is mapped to 0xf0000000
         * The kernel data PTs will handle the mapping of
         *   0xf1000000-0xf5ffffff (80 Mb)
         * 2Meg of VRAM is mapped to 0xf7000000
         * The page tables are mapped to 0xefc00000
         * The IOMD is mapped to 0xf6000000
         * The VIDC is mapped to 0xf6100000
         * The IOMD/VIDC could be pushed up higher but i havent got
         * sufficient documentation to do so; the addresses are not
         * parametized yet and hard to read... better fix this before;
         * its pretty unforgiving.
         */

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

        /* Load memory into UVM. */
#ifdef VERBOSE_INIT_ARM
        printf("page ");
#endif
        uvm_md_init();

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

                if (bootconfig.dram[loop].flags & PHYSMEM_TYPE_PROCESSOR_ONLY) {
                        uvm_page_physload(atop(start), atop(end),
                                        atop(start), atop(end), VM_FREELIST_DEFAULT);
                } else {
                        uvm_page_physload(atop(start), atop(end),
                                        atop(start), atop(end), VM_FREELIST_RPCDMA);
                }
        }

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

        /* Setup the IRQ system */
#ifdef VERBOSE_INIT_ARM
        printf("irq ");
#endif
        console_flush();
        irq_init();
#ifdef VERBOSE_INIT_ARM
        printf("done.\n\n");
#endif

#if NVIDCVIDEO>0
        consinit();             /* necessary ? */
#endif

        /* Talk to the user */
        printf("NetBSD/acorn32 booting ... \n");

        /* Tell the user if his boot loader is too old */
        if ((bootconfig.magic < BOOTCONFIG_MAGIC) ||
            (bootconfig.version != BOOTCONFIG_VERSION)) {
                printf("\nDETECTED AN OLD BOOTLOADER. PLEASE UPGRADE IT\n\n");
                delay(5000000);
        }

        printf("Kernel loaded from file %s\n", bootconfig.kernelname);
        printf("Kernel arg string (@%p) %s\n",
            bootconfig.args, bootconfig.args);
        printf("\nBoot configuration structure reports the following "
            "memory\n");

        printf(" DRAM block 0a at %08x size %08x "
            "DRAM block 0b at %08x size %08x\n\r",
            bootconfig.dram[0].address,
            bootconfig.dram[0].pages * bootconfig.pagesize,
            bootconfig.dram[1].address,
            bootconfig.dram[1].pages * bootconfig.pagesize);
        printf(" DRAM block 1a at %08x size %08x "
            "DRAM block 1b at %08x size %08x\n\r",
            bootconfig.dram[2].address,
            bootconfig.dram[2].pages * bootconfig.pagesize,
            bootconfig.dram[3].address,
            bootconfig.dram[3].pages * bootconfig.pagesize);
        printf(" VRAM block 0  at %08x size %08x\n\r",
            bootconfig.vram[0].address,
            bootconfig.vram[0].pages * bootconfig.pagesize);
        if (hasKinetic)
                printf("%s", " Kinetic memory was detected\n\r");

        /*
         * Get a handle on the I2C interface so we can read
         * the NVRAM in the real-time clock chip.
         */
        acorn32_i2c_tag = iomdiic_bootstrap_cookie();

        if (cmos_read(RTC_ADDR_REBOOTCNT) > 0)
                printf("Warning: REBOOTCNT = %d\n",
                    cmos_read(RTC_ADDR_REBOOTCNT));

#ifdef CPU_SA110
        if (cputype == CPU_ID_SA110)
                rpc_sa110_cc_setup();
#endif  /* CPU_SA110 */

#if NKSYMS || defined(DDB) || defined(MODULAR)
        ksyms_addsyms_elf(bootconfig.ksym_end - bootconfig.ksym_start,
                (void *) bootconfig.ksym_start, (void *) bootconfig.ksym_end);
#endif


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

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


static void
process_kernel_args(void)
{
        char *args;

        /* Ok now we will check the arguments for interesting parameters. */
        args = bootconfig.args;
        boothowto = 0;

        /* Only arguments itself are passed from the new bootloader */
        while (*args == ' ')
                ++args;

        boot_args = args;
        parse_mi_bootargs(boot_args);
        parse_rpc_bootargs(boot_args);
}


void
parse_rpc_bootargs(char *args)
{
        int integer;

        if (get_bootconf_option(args, "videodram", BOOTOPT_TYPE_INT,
            &integer)) {
                videodram_size = integer;
                /* Round to 4K page */
                videodram_size *= 1024;
                videodram_size = round_page(videodram_size);
                if (videodram_size > 1024*1024)
                        videodram_size = 1024*1024;
        }

#if 0
        /* XXX this I would rather have in the new bootconfig structure */
        if (get_bootconf_option(args, "kinetic", BOOTOPT_TYPE_BOOLEAN,
            &integer)) {
                bootconfig.RPC_kinetic_card_support = 1;
        }
#endif
}


#ifdef CPU_SA110

/*
 * For optimal cache cleaning we need two 16K banks of
 * virtual address space that NOTHING else will access
 * and then we alternate the cache cleaning between the
 * two banks.
 * The cache cleaning code requires 2 banks aligned
 * on total size boundary so the banks can be alternated by
 * xorring the size bit (assumes the bank size is a power of 2)
 */
extern unsigned int sa1_cache_clean_addr;
extern unsigned int sa1_cache_clean_size;
void
rpc_sa110_cc_setup(void)
{
        int loop;
        paddr_t kaddr;

        (void) pmap_extract(pmap_kernel(), KERNEL_TEXT_BASE, &kaddr);
        const pt_entry_t npte = L2_S_PROTO | kaddr |
            L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | pte_l2_s_cache_mode;
        for (loop = 0; loop < CPU_SA110_CACHE_CLEAN_SIZE; loop += PAGE_SIZE) {
                pt_entry_t * const ptep = vtopte(sa110_cc_base + loop);
                l2pte_set(ptep, npte, 0);
                PTE_SYNC(ptep);
        }
        sa1_cache_clean_addr = sa110_cc_base;
        sa1_cache_clean_size = CPU_SA110_CACHE_CLEAN_SIZE / 2;
}
#endif  /* CPU_SA110 */

/*
 * To convert from RISC OS addresses to real CMOS addresses, do this:
 *
 * if (riscosaddr < 0xc0)
 *         realaddr = riscosaddr + 0x40;
 * else
 *         realaddr = riscosaddr - 0xb0;
 */

/* Read a byte from CMOS RAM. */
int
cmos_read(int location)
{
        uint8_t val;

        if (pcfrtc_bootstrap_read(acorn32_i2c_tag, 0x50,
            location, &val, 1) != 0)
                return (-1);
        return (val);
}

/* Write a byte to CMOS RAM. */
int
cmos_write(int location, int value)
{
        uint8_t val = value;
        int oldvalue, oldsum;

        /* Get the old value and checksum. */
        if ((oldvalue = cmos_read(location)) < 0)
                return (-1);
        if ((oldsum = cmos_read(RTC_ADDR_CHECKSUM)) < 0)
                return (-1);

        if (pcfrtc_bootstrap_write(acorn32_i2c_tag, 0x50,
            location, &val, 1) != 0)
                return (-1);

        /* Now update the checksum. */
        val = (uint8_t)oldsum - (uint8_t)oldvalue + val;
        return (pcfrtc_bootstrap_write(acorn32_i2c_tag, 0x50,
            RTC_ADDR_CHECKSUM, &val, 1));
}

/* End of machdep.c */