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/*
Copyright 2011 Jun WAKO <wakojun@gmail.com>

This software is licensed with a Modified BSD License.
All of this is supposed to be Free Software, Open Source, DFSG-free,
GPL-compatible, and OK to use in both free and proprietary applications.
Additions and corrections to this file are welcome.


Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

* 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.

* Neither the name of the copyright holders nor the names of
  contributors may be used to endorse or promote products derived
  from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER 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.
*/

#ifndef ADB_H
#define ADB_H

#include <stdint.h>
#include <stdbool.h>

#if !(defined(ADB_PORT) && \
      defined(ADB_PIN)  && \
      defined(ADB_DDR)  && \
      defined(ADB_DATA_BIT))
#   error "ADB port setting is required in config.h"
#endif

#define ADB_POWER       0x7F
#define ADB_CAPS        0x39


// ADB host
void     adb_host_init(void);
bool     adb_host_psw(void);
uint16_t adb_host_kbd_recv(void);
uint16_t adb_host_mouse_recv(void);
void     adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l);
void     adb_host_kbd_led(uint8_t led);
void     adb_mouse_task(void);
void     adb_mouse_init(void);


#endif
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/******************************************************************************
 * domain_build.c
 * 
 * Copyright (c) 2002-2005, K A Fraser
 */

#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/ctype.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <xen/delay.h>
#include <xen/event.h>
#include <xen/console.h>
#include <xen/kernel.h>
#include <xen/domain.h>
#include <xen/version.h>
#include <xen/iocap.h>
#include <xen/bitops.h>
#include <xen/compat.h>
#include <asm/regs.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/paging.h>

#include <public/version.h>
#include <public/libelf.h>

extern unsigned long initial_images_nrpages(void);
extern void discard_initial_images(void);

static long __initdata dom0_nrpages;
static long __initdata dom0_min_nrpages;
static long __initdata dom0_max_nrpages = LONG_MAX;

/*
 * dom0_mem=[min:<min_amt>,][max:<max_amt>,][<amt>]
 * 
 * <min_amt>: The minimum amount of memory which should be allocated for dom0.
 * <max_amt>: The maximum amount of memory which should be allocated for dom0.
 * <amt>:     The precise amount of memory to allocate for dom0.
 * 
 * Notes:
 *  1. <amt> is clamped from below by <min_amt> and from above by available
 *     memory and <max_amt>
 *  2. <min_amt> is clamped from above by available memory and <max_amt>
 *  3. <min_amt> is ignored if it is greater than <max_amt>
 *  4. If <amt> is not specified, it is calculated as follows:
 *     "All of memory is allocated to domain 0, minus 1/16th which is reserved
 *      for uses such as DMA buffers (the reservation is clamped to 128MB)."
 * 
 * Each value can be specified as positive or negative:
 *  If +ve: The specified amount is an absolute value.
 *  If -ve: The specified amount is subtracted from total available memory.
 */
static long __init parse_amt(const char *s, const char **ps)
{
    long pages = parse_size_and_unit((*s == '-') ? s+1 : s, ps) >> PAGE_SHIFT;
    return (*s == '-') ? -pages : pages;
}
static void __init parse_dom0_mem(const char *s)
{
    do {
        if ( !strncmp(s, "min:", 4) )
            dom0_min_nrpages = parse_amt(s+4, &s);
        else if ( !strncmp(s, "max:", 4) )
            dom0_max_nrpages = parse_amt(s+4, &s);
        else
            dom0_nrpages = parse_amt(s, &s);
        if ( *s != ',' )
            break;
    } while ( *s++ == ',' );
}
custom_param("dom0_mem", parse_dom0_mem);

static unsigned int opt_dom0_max_vcpus;
integer_param("dom0_max_vcpus", opt_dom0_max_vcpus);

static unsigned int opt_dom0_shadow;
boolean_param("dom0_shadow", opt_dom0_shadow);

static char opt_dom0_ioports_disable[200] = "";
string_param("dom0_ioports_disable", opt_dom0_ioports_disable);

#if defined(__i386__)
/* No ring-3 access in initial leaf page tables. */
#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#define L3_PROT (_PAGE_PRESENT)
#elif defined(__x86_64__)
/* Allow ring-3 access in long mode as guest cannot use ring 1 ... */
#define BASE_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER)
#define L1_PROT (BASE_PROT|_PAGE_GUEST_KERNEL)
/* ... except for compatibility mode guests. */
#define COMPAT_L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
#define L2_PROT (BASE_PROT|_PAGE_DIRTY)
#define L3_PROT (BASE_PROT|_PAGE_DIRTY)
#define L4_PROT (BASE_PROT|_PAGE_DIRTY)
#endif

#define round_pgup(_p)    (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
#define round_pgdown(_p)  ((_p)&PAGE_MASK)

static struct page_info * __init alloc_chunk(
    struct domain *d, unsigned long max_pages)
{
    struct page_info *page;
    unsigned int order;
    /*
     * Allocate up to 2MB at a time: It prevents allocating very large chunks
     * from DMA pools before the >4GB pool is fully depleted.
     */
    if ( max_pages > (2UL << (20 - PAGE_SHIFT)) )
        max_pages = 2UL << (20 - PAGE_SHIFT);
    order = get_order_from_pages(max_pages);
    if ( (max_pages & (max_pages-1)) != 0 )
        order--;
    while ( (page = alloc_domheap_pages(d, order, 0)) == NULL )
        if ( order-- == 0 )
            break;
    return page;
}

static unsigned long __init compute_dom0_nr_pages(void)
{
    unsigned long avail = avail_domheap_pages() + initial_images_nrpages();

    /*
     * If domain 0 allocation isn't specified, reserve 1/16th of available
     * memory for things like DMA buffers. This reservation is clamped to 
     * a maximum of 128MB.
     */
    if ( dom0_nrpages == 0 )
    {
        dom0_nrpages = avail;
        dom0_nrpages = min(dom0_nrpages / 16, 128L << (20 - PAGE_SHIFT));
        dom0_nrpages = -dom0_nrpages;
    }

    /* Negative memory specification means "all memory - specified amount". */
    if ( dom0_nrpages     < 0 ) dom0_nrpages     += avail;
    if ( dom0_min_nrpages < 0 ) dom0_min_nrpages += avail;
    if ( dom0_max_nrpages < 0 ) dom0_max_nrpages += avail;

    /* Clamp dom0 memory according to min/max limits and available memory. */
    dom0_nrpages = max(dom0_nrpages, dom0_min_nrpages);
    dom0_nrpages = min(dom0_nrpages, dom0_max_nrpages);
    dom0_nrpages = min(dom0_nrpages, (long)avail);

    return dom0_nrpages;
}

static void __init process_dom0_ioports_disable(void)
{
    unsigned long io_from, io_to;
    char *t, *s = opt_dom0_ioports_disable;
    const char *u;

    if ( *s == '\0' )
        return;

    while ( (t = strsep(&s, ",")) != NULL )
    {
        io_from = simple_strtoul(t, &u, 16);
        if ( u == t )
        {
        parse_error:
            printk("Invalid ioport range <%s> "
                   "in dom0_ioports_disable, skipping\n", t);
            continue;
        }

        if ( *u == '\0' )
            io_to = io_from;
        else if ( *u == '-' )
            io_to = simple_strtoul(u + 1, &u, 16);
        else
            goto parse_error;

        if ( (*u != '\0') || (io_to < io_from) || (io_to >= 65536) )
            goto parse_error;

        printk("Disabling dom0 access to ioport range %04lx-%04lx\n",
            io_from, io_to);

        if ( ioports_deny_access(dom0, io_from, io_to) != 0 )
            BUG();
    }
}

int __init construct_dom0(
    struct domain *d,
    unsigned long _image_start, unsigned long image_len, 
    unsigned long _initrd_start, unsigned long initrd_len,
    char *cmdline)
{
    int i, rc, compatible, compat32, order, machine;
    struct cpu_user_regs *regs;
    unsigned long pfn, mfn;
    unsigned long nr_pages;
    unsigned long nr_pt_pages;
    unsigned long alloc_spfn;
    unsigned long alloc_epfn;
    unsigned long count;
    struct page_info *page = NULL;
    start_info_t *si;
    struct vcpu *v = d->vcpu[0];
    unsigned long long value;
#if defined(__i386__)
    char *image_start  = (char *)_image_start;  /* use lowmem mappings */
    char *initrd_start = (char *)_initrd_start; /* use lowmem mappings */
#elif defined(__x86_64__)
    char *image_start  = __va(_image_start);
    char *initrd_start = __va(_initrd_start);
#endif
#if CONFIG_PAGING_LEVELS >= 4
    l4_pgentry_t *l4tab = NULL, *l4start = NULL;
#endif
#if CONFIG_PAGING_LEVELS >= 3
    l3_pgentry_t *l3tab = NULL, *l3start = NULL;
#endif
    l2_pgentry_t *l2tab = NULL, *l2start = NULL;
    l1_pgentry_t *l1tab = NULL, *l1start = NULL;

    /*
     * This fully describes the memory layout of the initial domain. All 
     * *_start address are page-aligned, except v_start (and v_end) which are 
     * superpage-aligned.
     */
    struct elf_binary elf;
    struct elf_dom_parms parms;
    unsigned long vkern_start;
    unsigned long vkern_end;
    unsigned long vinitrd_start;
    unsigned long vinitrd_end;
    unsigned long vphysmap_start;
    unsigned long vphysmap_end;
    unsigned long vstartinfo_start;
    unsigned long vstartinfo_end;
    unsigned long vstack_start;
    unsigned long vstack_end;
    unsigned long vpt_start;
    unsigned long vpt_end;
    unsigned long v_start;
    unsigned long v_end;

    /* Machine address of next candidate page-table page. */
    unsigned long mpt_alloc;

    /* Features supported. */
    uint32_t dom0_features_supported[XENFEAT_NR_SUBMAPS] = { 0 };
    uint32_t dom0_features_required[XENFEAT_NR_SUBMAPS] = { 0 };

    /* Sanity! */
    BUG_ON(d->domain_id != 0);
    BUG_ON(d->vcpu[0] == NULL);
    BUG_ON(v->is_initialised);

    printk("*** LOADING DOMAIN 0 ***\n");

    d->max_pages = ~0U;

    nr_pages = compute_dom0_nr_pages();

    if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
        return rc;
#ifdef VERBOSE
    elf_set_verbose(&elf);
#endif
    elf_parse_binary(&elf);
    if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
        return rc;

    /* compatibility check */
    compatible = 0;
    compat32   = 0;
    machine = elf_uval(&elf, elf.ehdr, e_machine);
    switch (CONFIG_PAGING_LEVELS) {
    case 2: /* x86_32 */
        if (parms.pae == PAEKERN_bimodal)
            parms.pae = PAEKERN_no;
        printk(" Xen  kernel: 32-bit, lsb\n");
        if (elf_32bit(&elf) && !parms.pae && machine == EM_386)
            compatible = 1;
        break;
    case 3: /* x86_32p */
        if (parms.pae == PAEKERN_bimodal)
            parms.pae = PAEKERN_extended_cr3;
        printk(" Xen  kernel: 32-bit, PAE, lsb\n");
        if (elf_32bit(&elf) && parms.pae && machine == EM_386)
            compatible = 1;
        break;
    case 4: /* x86_64 */
#ifndef CONFIG_COMPAT
        printk(" Xen  kernel: 64-bit, lsb\n");
#else
        printk(" Xen  kernel: 64-bit, lsb, compat32\n");
        if (elf_32bit(&elf) && parms.pae == PAEKERN_bimodal)
            parms.pae = PAEKERN_extended_cr3;
        if (elf_32bit(&elf) && parms.pae && machine == EM_386)
        {
            compat32 = 1;
            compatible = 1;
        }
#endif
        if (elf_64bit(&elf) && machine == EM_X86_64)
            compatible = 1;
        break;
    }
    printk(" Dom0 kernel: %s%s, %s, paddr 0x%" PRIx64 " -> 0x%" PRIx64 "\n",
           elf_64bit(&elf) ? "64-bit" : "32-bit",
           parms.pae       ? ", PAE"  : "",
           elf_msb(&elf)   ? "msb"    : "lsb",
           elf.pstart, elf.pend);

    if ( !compatible )
    {
        printk("Mismatch between Xen and DOM0 kernel\n");
        return -EINVAL;
    }

#ifdef CONFIG_COMPAT
    if ( compat32 )
    {
        l1_pgentry_t gdt_l1e;

        d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 1;
        v->vcpu_info = (void *)&d->shared_info->compat.vcpu_info[0];

        if ( nr_pages != (unsigned int)nr_pages )
            nr_pages = UINT_MAX;

        /*
         * Map compatibility Xen segments into every VCPU's GDT. See
         * arch_domain_create() for further comments.
         */
        gdt_l1e = l1e_from_page(virt_to_page(compat_gdt_table),
                                PAGE_HYPERVISOR);
        for ( i = 0; i < MAX_VIRT_CPUS; i++ )
            d->arch.mm_perdomain_pt[((i << GDT_LDT_VCPU_SHIFT) +
                                     FIRST_RESERVED_GDT_PAGE)] = gdt_l1e;
        local_flush_tlb_one(GDT_LDT_VIRT_START + FIRST_RESERVED_GDT_BYTE);
    }
#endif
    if ( parms.pae == PAEKERN_extended_cr3 )
            set_bit(VMASST_TYPE_pae_extended_cr3, &d->vm_assist);

    if ( UNSET_ADDR != parms.virt_hv_start_low && elf_32bit(&elf) )
    {
#if CONFIG_PAGING_LEVELS < 4
        unsigned long mask = (1UL << L2_PAGETABLE_SHIFT) - 1;
#else
        unsigned long mask = is_pv_32bit_domain(d)
                             ? (1UL << L2_PAGETABLE_SHIFT) - 1
                             : (1UL << L4_PAGETABLE_SHIFT) - 1;
#endif

        value = (parms.virt_hv_start_low + mask) & ~mask;
#ifdef CONFIG_COMPAT
        HYPERVISOR_COMPAT_VIRT_START(d) =
            max_t(unsigned int, m2p_compat_vstart, value);
        d->arch.physaddr_bitsize = !is_pv_32on64_domain(d) ? 64 :
            fls((1UL << 32) - HYPERVISOR_COMPAT_VIRT_START(d)) - 1
            + (PAGE_SIZE - 2);
        if ( value > (!is_pv_32on64_domain(d) ?
                      HYPERVISOR_VIRT_START :
                      __HYPERVISOR_COMPAT_VIRT_START) )
#else
        if ( value > HYPERVISOR_VIRT_START )
#endif
            panic("Domain 0 expects too high a hypervisor start address.\n");
    }

    if ( parms.f_required[0] /* Huh? -- kraxel */ )
            panic("Domain 0 requires an unsupported hypervisor feature.\n");

    /*
     * Why do we need this? The number of page-table frames depends on the 
     * size of the bootstrap address space. But the size of the address space 
     * depends on the number of page-table frames (since each one is mapped 
     * read-only). We have a pair of simultaneous equations in two unknowns, 
     * which we solve by exhaustive search.
     */
    v_start          = parms.virt_base;
    vkern_start      = parms.virt_kstart;
    vkern_end        = parms.virt_kend;
    vinitrd_start    = round_pgup(vkern_end);
    vinitrd_end      = vinitrd_start + initrd_len;
    vphysmap_start   = round_pgup(vinitrd_end);
    vphysmap_end     = vphysmap_start + (nr_pages * (!is_pv_32on64_domain(d) ?
                                                     sizeof(unsigned long) :
                                                     sizeof(unsigned int)));
    vstartinfo_start = round_pgup(vphysmap_end);
    vstartinfo_end   = (vstartinfo_start +
                        sizeof(struct start_info) +
                        sizeof(struct dom0_vga_console_info));
    vpt_start        = round_pgup(vstartinfo_end);
    for ( nr_pt_pages = 2; ; nr_pt_pages++ )
    {
        vpt_end          = vpt_start + (nr_pt_pages * PAGE_SIZE);
        vstack_start     = vpt_end;
        vstack_end       = vstack_start + PAGE_SIZE;
        v_end            = (vstack_end + (1UL<<22)-1) & ~((1UL<<22)-1);
        if ( (v_end - vstack_end) < (512UL << 10) )
            v_end += 1UL << 22; /* Add extra 4MB to get >= 512kB padding. */
#if defined(__i386__) && !defined(CONFIG_X86_PAE)
        if ( (((v_end - v_start + ((1UL<<L2_PAGETABLE_SHIFT)-1)) >>
               L2_PAGETABLE_SHIFT) + 1) <= nr_pt_pages )
            break;
#elif defined(__i386__) && defined(CONFIG_X86_PAE)
        /* 5 pages: 1x 3rd + 4x 2nd level */
        if ( (((v_end - v_start + ((1UL<<L2_PAGETABLE_SHIFT)-1)) >>
               L2_PAGETABLE_SHIFT) + 5) <= nr_pt_pages )
            break;
#elif defined(__x86_64__)
#define NR(_l,_h,_s) \
    (((((_h) + ((1UL<<(_s))-1)) & ~((1UL<<(_s))-1)) - \
       ((_l) & ~((1UL<<(_s))-1))) >> (_s))
        if ( (1 + /* # L4 */
              NR(v_start, v_end, L4_PAGETABLE_SHIFT) + /* # L3 */
              (!is_pv_32on64_domain(d) ?
               NR(v_start, v_end, L3_PAGETABLE_SHIFT) : /* # L2 */
               4) + /* # compat L2 */
              NR(v_start, v_end, L2_PAGETABLE_SHIFT))  /* # L1 */
             <= nr_pt_pages )
            break;
#endif
    }

    order = get_order_from_bytes(v_end - v_start);
    if ( (1UL << order) > nr_pages )
        panic("Domain 0 allocation is too small for kernel image.\n");

#ifdef __i386__
    /* Ensure that our low-memory 1:1 mapping covers the allocation. */
    page = alloc_domheap_pages(d, order,
                               MEMF_bits(30 + (v_start >> 31)));
#else
    page = alloc_domheap_pages(d, order, 0);
#endif
    if ( page == NULL )
        panic("Not enough RAM for domain 0 allocation.\n");
    alloc_spfn = page_to_mfn(page);
    alloc_epfn = alloc_spfn + d->tot_pages;

    printk("PHYSICAL MEMORY ARRANGEMENT:\n"
           " Dom0 alloc.:   %"PRIpaddr"->%"PRIpaddr,
           pfn_to_paddr(alloc_spfn), pfn_to_paddr(alloc_epfn));
    if ( d->tot_pages < nr_pages )
        printk(" (%lu pages to be allocated)",
               nr_pages - d->tot_pages);
    printk("\nVIRTUAL MEMORY ARRANGEMENT:\n"
           " Loaded kernel: %p->%p\n"
           " Init. ramdisk: %p->%p\n"
           " Phys-Mach map: %p->%p\n"
           " Start info:    %p->%p\n"
           " Page tables:   %p->%p\n"
           " Boot stack:    %p->%p\n"
           " TOTAL:         %p->%p\n",
           _p(vkern_start), _p(vkern_end),
           _p(vinitrd_start), _p(vinitrd_end),
           _p(vphysmap_start), _p(vphysmap_end),
           _p(vstartinfo_start), _p(vstartinfo_end),
           _p(vpt_start), _p(vpt_end),
           _p(vstack_start), _p(vstack_end),
           _p(v_start), _p(v_end));
    printk(" ENTRY ADDRESS: %p\n", _p(parms.virt_entry));

    if ( ((v_end - v_start)>>PAGE_SHIFT) > nr_pages )
    {
        printk("Initial guest OS requires too much space\n"
               "(%luMB is greater than %luMB limit)\n",
               (v_end-v_start)>>20, nr_pages>>(20-PAGE_SHIFT));
        return -ENOMEM;
    }

    mpt_alloc = (vpt_start - v_start) +
        (unsigned long)pfn_to_paddr(alloc_spfn);

#if defined(__i386__)
    /*
     * Protect the lowest 1GB of memory. We use a temporary mapping there
     * from which we copy the kernel and ramdisk images.
     */
    if ( v_start < (1UL<<30) )
    {
        printk("Initial loading isn't allowed to lowest 1GB of memory.\n");
        return -EINVAL;
    }

    /* WARNING: The new domain must have its 'processor' field filled in! */
#if CONFIG_PAGING_LEVELS == 3
    l3start = l3tab = (l3_pgentry_t *)mpt_alloc; mpt_alloc += PAGE_SIZE;
    l2start = l2tab = (l2_pgentry_t *)mpt_alloc; mpt_alloc += 4*PAGE_SIZE;
    memcpy(l2tab, idle_pg_table_l2, 4*PAGE_SIZE);
    for (i = 0; i < 4; i++) {
        l3tab[i] = l3e_from_paddr((u32)l2tab + i*PAGE_SIZE, L3_PROT);
        l2tab[(LINEAR_PT_VIRT_START >> L2_PAGETABLE_SHIFT)+i] =
            l2e_from_paddr((u32)l2tab + i*PAGE_SIZE, __PAGE_HYPERVISOR);
    }
    v->arch.guest_table = pagetable_from_paddr((unsigned long)l3start);
#else
    l2start = l2tab = (l2_pgentry_t *)mpt_alloc; mpt_alloc += PAGE_SIZE;
    copy_page(l2tab, idle_pg_table);
    l2tab[LINEAR_PT_VIRT_START >> L2_PAGETABLE_SHIFT] =
        l2e_from_paddr((unsigned long)l2start, __PAGE_HYPERVISOR);
    v->arch.guest_table = pagetable_from_paddr((unsigned long)l2start);
#endif

    for ( i = 0; i < PDPT_L2_ENTRIES; i++ )
        l2tab[l2_linear_offset(PERDOMAIN_VIRT_START) + i] =
            l2e_from_page(virt_to_page(d->arch.mm_perdomain_pt) + i,
                          __PAGE_HYPERVISOR);

    l2tab += l2_linear_offset(v_start);
    mfn = alloc_spfn;
    for ( count = 0; count < ((v_end-v_start)>>PAGE_SHIFT); count++ )
    {
        if ( !((unsigned long)l1tab & (PAGE_SIZE-1)) )
        {
            l1start = l1tab = (l1_pgentry_t *)mpt_alloc;
            mpt_alloc += PAGE_SIZE;
            *l2tab = l2e_from_paddr((unsigned long)l1start, L2_PROT);
            l2tab++;
            clear_page(l1tab);
            if ( count == 0 )
                l1tab += l1_table_offset(v_start);
        }
        *l1tab = l1e_from_pfn(mfn, L1_PROT);
        l1tab++;
        
        page = mfn_to_page(mfn);
        if ( !get_page_and_type(page, d, PGT_writable_page) )
            BUG();

        mfn++;
    }

    /* Pages that are part of page tables must be read only. */
    l2tab = l2start + l2_linear_offset(vpt_start);
    l1start = l1tab = (l1_pgentry_t *)(u32)l2e_get_paddr(*l2tab);
    l1tab += l1_table_offset(vpt_start);
    for ( count = 0; count < nr_pt_pages; count++ ) 
    {
        page = mfn_to_page(l1e_get_pfn(*l1tab));
        if ( !opt_dom0_shadow )
            l1e_remove_flags(*l1tab, _PAGE_RW);
        else
            if ( !get_page_type(page, PGT_writable_page) )
                BUG();

#if CONFIG_PAGING_LEVELS == 3
        switch (count) {
        case 0:
            page->u.inuse.type_info &= ~PGT_type_mask;
            page->u.inuse.type_info |= PGT_l3_page_table;
            get_page(page, d); /* an extra ref because of readable mapping */

            /* Get another ref to L3 page so that it can be pinned. */
            if ( !get_page_and_type(page, d, PGT_l3_page_table) )
                BUG();
            set_bit(_PGT_pinned, &page->u.inuse.type_info);
            break;
        case 1 ... 4:
            page->u.inuse.type_info &= ~PGT_type_mask;
            page->u.inuse.type_info |= PGT_l2_page_table;
            if ( count == 4 )
                page->u.inuse.type_info |= PGT_pae_xen_l2;
            get_page(page, d); /* an extra ref because of readable mapping */
            break;
        default:
            page->u.inuse.type_info &= ~PGT_type_mask;
            page->u.inuse.type_info |= PGT_l1_page_table;
            get_page(page, d); /* an extra ref because of readable mapping */
            break;
        }
#else
        if ( count == 0 )
        {
            page->u.inuse.type_info &= ~PGT_type_mask;
            page->u.inuse.type_info |= PGT_l2_page_table;

            /*
             * No longer writable: decrement the type_count.
             * Installed as CR3: increment both the ref_count and type_count.
             * Net: just increment the ref_count.
             */
            get_page(page, d); /* an extra ref because of readable mapping */

            /* Get another ref to L2 page so that it can be pinned. */
            if ( !get_page_and_type(page, d, PGT_l2_page_table) )
                BUG();
            set_bit(_PGT_pinned, &page->u.inuse.type_info);
        }
        else
        {
            page->u.inuse.type_info &= ~PGT_type_mask;
            page->u.inuse.type_info |= PGT_l1_page_table;

            /*
             * No longer writable: decrement the type_count.
             * This is an L1 page, installed in a validated L2 page:
             * increment both the ref_count and type_count.
             * Net: just increment the ref_count.
             */
            get_page(page, d); /* an extra ref because of readable mapping */
        }
#endif
        if ( !((unsigned long)++l1tab & (PAGE_SIZE - 1)) )
            l1start = l1tab = (l1_pgentry_t *)(u32)l2e_get_paddr(*++l2tab);
    }

#elif defined(__x86_64__)

    /* Overlap with Xen protected area? */
    if ( !is_pv_32on64_domain(d) ?
         ((v_start < HYPERVISOR_VIRT_END) &&
          (v_end > HYPERVISOR_VIRT_START)) :
         (v_end > HYPERVISOR_COMPAT_VIRT_START(d)) )
    {
        printk("DOM0 image overlaps with Xen private area.\n");
        return -EINVAL;
    }

    if ( is_pv_32on64_domain(d) )
    {
        v->arch.guest_context.failsafe_callback_cs = FLAT_COMPAT_KERNEL_CS;
        v->arch.guest_context.event_callback_cs    = FLAT_COMPAT_KERNEL_CS;
    }

    /* WARNING: The new domain must have its 'processor' field filled in! */
    if ( !is_pv_32on64_domain(d) )
    {
        maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l4_page_table;
        l4start = l4tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
    }
    else
    {
        page = alloc_domheap_page(NULL);
        if ( !page )
            panic("Not enough RAM for domain 0 PML4.\n");
        l4start = l4tab = page_to_virt(page);
    }
    copy_page(l4tab, idle_pg_table);
    l4tab[l4_table_offset(LINEAR_PT_VIRT_START)] =
        l4e_from_paddr(__pa(l4start), __PAGE_HYPERVISOR);
    l4tab[l4_table_offset(PERDOMAIN_VIRT_START)] =
        l4e_from_paddr(__pa(d->arch.mm_perdomain_l3), __PAGE_HYPERVISOR);
    v->arch.guest_table = pagetable_from_paddr(__pa(l4start));
    if ( is_pv_32on64_domain(d) )
    {
        v->arch.guest_table_user = v->arch.guest_table;
        if ( setup_arg_xlat_area(v, l4start) < 0 )
            panic("Not enough RAM for domain 0 hypercall argument translation.\n");
    }

    l4tab += l4_table_offset(v_start);
    mfn = alloc_spfn;
    for ( count = 0; count < ((v_end-v_start)>>PAGE_SHIFT); count++ )
    {
        if ( !((unsigned long)l1tab & (PAGE_SIZE-1)) )
        {
            maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l1_page_table;
            l1start = l1tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
            clear_page(l1tab);
            if ( count == 0 )
                l1tab += l1_table_offset(v_start);
            if ( !((unsigned long)l2tab & (PAGE_SIZE-1)) )
            {
                maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
                l2start = l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
                clear_page(l2tab);
                if ( count == 0 )
                    l2tab += l2_table_offset(v_start);
                if ( !((unsigned long)l3tab & (PAGE_SIZE-1)) )
                {
                    maddr_to_page(mpt_alloc)->u.inuse.type_info =
                        PGT_l3_page_table;
                    l3start = l3tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
                    clear_page(l3tab);
                    if ( count == 0 )
                        l3tab += l3_table_offset(v_start);
                    *l4tab = l4e_from_paddr(__pa(l3start), L4_PROT);
                    l4tab++;
                }
                *l3tab = l3e_from_paddr(__pa(l2start), L3_PROT);
                l3tab++;
            }
            *l2tab = l2e_from_paddr(__pa(l1start), L2_PROT);
            l2tab++;
        }
        *l1tab = l1e_from_pfn(mfn, (!is_pv_32on64_domain(d) ?
                                    L1_PROT : COMPAT_L1_PROT));
        l1tab++;

        page = mfn_to_page(mfn);
        if ( (page->u.inuse.type_info == 0) &&
             !get_page_and_type(page, d, PGT_writable_page) )
            BUG();

        mfn++;
    }

#ifdef CONFIG_COMPAT
    if ( is_pv_32on64_domain(d) )
    {
        /* Ensure the first four L3 entries are all populated. */
        for ( i = 0, l3tab = l3start; i < 4; ++i, ++l3tab )
        {
            if ( !l3e_get_intpte(*l3tab) )
            {
                maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
                l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
                clear_page(l2tab);
                *l3tab = l3e_from_paddr(__pa(l2tab), L3_PROT);
            }
            if ( i == 3 )
                l3e_get_page(*l3tab)->u.inuse.type_info |= PGT_pae_xen_l2;
        }
        /* Install read-only guest visible MPT mapping. */
        l2tab = l3e_to_l2e(l3start[3]);
        memcpy(&l2tab[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
               &compat_idle_pg_table_l2[l2_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
               COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*l2tab));
    }
#endif

    /* Pages that are part of page tables must be read only. */
    l4tab = l4start + l4_table_offset(vpt_start);
    l3start = l3tab = l4e_to_l3e(*l4tab);
    l3tab += l3_table_offset(vpt_start);
    l2start = l2tab = l3e_to_l2e(*l3tab);
    l2tab += l2_table_offset(vpt_start);
    l1start = l1tab = l2e_to_l1e(*l2tab);
    l1tab += l1_table_offset(vpt_start);
    for ( count = 0; count < nr_pt_pages; count++ ) 
    {
        l1e_remove_flags(*l1tab, _PAGE_RW);
        page = mfn_to_page(l1e_get_pfn(*l1tab));

        /* Read-only mapping + PGC_allocated + page-table page. */
        page->count_info         = PGC_allocated | 3;
        page->u.inuse.type_info |= PGT_validated | 1;

        /* Top-level p.t. is pinned. */
        if ( (page->u.inuse.type_info & PGT_type_mask) ==
             (!is_pv_32on64_domain(d) ?
              PGT_l4_page_table : PGT_l3_page_table) )
        {
            page->count_info        += 1;
            page->u.inuse.type_info += 1 | PGT_pinned;
        }

        /* Iterate. */
        if ( !((unsigned long)++l1tab & (PAGE_SIZE - 1)) )
        {
            if ( !((unsigned long)++l2tab & (PAGE_SIZE - 1)) )
            {
                if ( !((unsigned long)++l3tab & (PAGE_SIZE - 1)) )
                    l3start = l3tab = l4e_to_l3e(*++l4tab);
                l2start = l2tab = l3e_to_l2e(*l3tab);
            }
            l1start = l1tab = l2e_to_l1e(*l2tab);
        }
    }

#endif /* __x86_64__ */

    /* Mask all upcalls... */
    for ( i = 0; i < MAX_VIRT_CPUS; i++ )
        shared_info(d, vcpu_info[i].evtchn_upcall_mask) = 1;

    if ( opt_dom0_max_vcpus == 0 )
        opt_dom0_max_vcpus = num_online_cpus();
    if ( opt_dom0_max_vcpus > num_online_cpus() )
        opt_dom0_max_vcpus = num_online_cpus();
    if ( opt_dom0_max_vcpus > MAX_VIRT_CPUS )
        opt_dom0_max_vcpus = MAX_VIRT_CPUS;
    if ( opt_dom0_max_vcpus > BITS_PER_GUEST_LONG(d) )
        opt_dom0_max_vcpus = BITS_PER_GUEST_LONG(d);
    printk("Dom0 has maximum %u VCPUs\n", opt_dom0_max_vcpus);

    for ( i = 1; i < opt_dom0_max_vcpus; i++ )
        (void)alloc_vcpu(d, i, i);

    /* Set up CR3 value for write_ptbase */
    if ( paging_mode_enabled(v->domain) )
        paging_update_paging_modes(v);
    else
        update_cr3(v);

    /* Install the new page tables. */
    local_irq_disable();
    write_ptbase(v);

    /* Copy the OS image and free temporary buffer. */
    elf.dest = (void*)vkern_start;
    elf_load_binary(&elf);

    if ( UNSET_ADDR != parms.virt_hypercall )
    {
        if ( (parms.virt_hypercall < v_start) ||
             (parms.virt_hypercall >= v_end) )
        {
            write_ptbase(current);
            local_irq_enable();
            printk("Invalid HYPERCALL_PAGE field in ELF notes.\n");
            return -1;
        }
        hypercall_page_initialise(d, (void *)(unsigned long)parms.virt_hypercall);
    }

    /* Copy the initial ramdisk. */
    if ( initrd_len != 0 )
        memcpy((void *)vinitrd_start, initrd_start, initrd_len);

    /* Free temporary buffers. */
    discard_initial_images();

    /* Set up start info area. */
    si = (start_info_t *)vstartinfo_start;
    clear_page(si);
    si->nr_pages = nr_pages;

    si->shared_info = virt_to_maddr(d->shared_info);

    si->flags        = SIF_PRIVILEGED | SIF_INITDOMAIN;
    si->pt_base      = vpt_start + 2 * PAGE_SIZE * !!is_pv_32on64_domain(d);
    si->nr_pt_frames = nr_pt_pages;
    si->mfn_list     = vphysmap_start;
    snprintf(si->magic, sizeof(si->magic), "xen-%i.%i-x86_%d%s",
            xen_major_version(), xen_minor_version(),
            elf_64bit(&elf) ? 64 : 32,
            parms.pae ? "p" : "");

    /* Write the phys->machine and machine->phys table entries. */
    for ( pfn = 0; pfn < d->tot_pages; pfn++ )
    {
        mfn = pfn + alloc_spfn;
#ifndef NDEBUG
#define REVERSE_START ((v_end - v_start) >> PAGE_SHIFT)
        if ( pfn > REVERSE_START )
            mfn = alloc_epfn - (pfn - REVERSE_START);
#endif
        if ( !is_pv_32on64_domain(d) )
            ((unsigned long *)vphysmap_start)[pfn] = mfn;
        else
            ((unsigned int *)vphysmap_start)[pfn] = mfn;
        set_gpfn_from_mfn(mfn, pfn);
    }
    while ( pfn < nr_pages )
    {
        if ( (page = alloc_chunk(d, nr_pages - d->tot_pages)) == NULL )
            panic("Not enough RAM for DOM0 reservation.\n");
        while ( pfn < d->tot_pages )
        {
            mfn = page_to_mfn(page);
#ifndef NDEBUG
#define pfn (nr_pages - 1 - (pfn - (alloc_epfn - alloc_spfn)))
#endif
            if ( !is_pv_32on64_domain(d) )
                ((unsigned long *)vphysmap_start)[pfn] = mfn;
            else
                ((unsigned int *)vphysmap_start)[pfn] = mfn;
            set_gpfn_from_mfn(mfn, pfn);
#undef pfn
            page++; pfn++;
        }
    }

    if ( initrd_len != 0 )
    {
        si->mod_start = vinitrd_start;
        si->mod_len   = initrd_len;
        printk("Initrd len 0x%lx, start at 0x%lx\n",
               si->mod_len, si->mod_start);
    }

    memset(si->cmd_line, 0, sizeof(si->cmd_line));
    if ( cmdline != NULL )
        strlcpy((char *)si->cmd_line, cmdline, sizeof(si->cmd_line));

    if ( fill_console_start_info((void *)(si + 1)) )
    {
        si->console.dom0.info_off  = sizeof(struct start_info);
        si->console.dom0.info_size = sizeof(struct dom0_vga_console_info);
    }

#ifdef CONFIG_COMPAT
    if ( is_pv_32on64_domain(d) )
        xlat_start_info(si, XLAT_start_info_console_dom0);
#endif

    /* Reinstate the caller's page tables. */
    write_ptbase(current);
    local_irq_enable();

#if defined(__i386__)
    /* Destroy low mappings - they were only for our convenience. */
    zap_low_mappings(l2start);
#endif

    update_domain_wallclock_time(d);

    v->is_initialised = 1;
    clear_bit(_VPF_down, &v->pause_flags);

    /*
     * Initial register values:
     *  DS,ES,FS,GS = FLAT_KERNEL_DS
     *       CS:EIP = FLAT_KERNEL_CS:start_pc
     *       SS:ESP = FLAT_KERNEL_SS:start_stack
     *          ESI = start_info
     *  [EAX,EBX,ECX,EDX,EDI,EBP are zero]
     */
    regs = &v->arch.guest_context.user_regs;
    regs->ds = regs->es = regs->fs = regs->gs =
        !is_pv_32on64_domain(d) ? FLAT_KERNEL_DS : FLAT_COMPAT_KERNEL_DS;
    regs->ss = (!is_pv_32on64_domain(d) ?
                FLAT_KERNEL_SS : FLAT_COMPAT_KERNEL_SS);
    regs->cs = (!is_pv_32on64_domain(d) ?
                FLAT_KERNEL_CS : FLAT_COMPAT_KERNEL_CS);
    regs->eip = parms.virt_entry;
    regs->esp = vstack_end;
    regs->esi = vstartinfo_start;
    regs->eflags = X86_EFLAGS_IF;

    if ( opt_dom0_shadow )
        if ( paging_enable(d, PG_SH_enable) == 0 ) 
            paging_update_paging_modes(v);

    if ( supervisor_mode_kernel )
    {
        v->arch.guest_context.kernel_ss &= ~3;
        v->arch.guest_context.user_regs.ss &= ~3;
        v->arch.guest_context.user_regs.es &= ~3;
        v->arch.guest_context.user_regs.ds &= ~3;
        v->arch.guest_context.user_regs.fs &= ~3;
        v->arch.guest_context.user_regs.gs &= ~3;
        printk("Dom0 runs in ring 0 (supervisor mode)\n");
        if ( !test_bit(XENFEAT_supervisor_mode_kernel,
                       dom0_features_supported) )
            panic("Dom0 does not support supervisor-mode execution\n");
    }
    else
    {
        if ( test_bit(XENFEAT_supervisor_mode_kernel, dom0_features_required) )
            panic("Dom0 requires supervisor-mode execution\n");
    }

    rc = 0;

    /* DOM0 is permitted full I/O capabilities. */
    rc |= ioports_permit_access(dom0, 0, 0xFFFF);
    rc |= iomem_permit_access(dom0, 0UL, ~0UL);
    rc |= irqs_permit_access(dom0, 0, NR_IRQS-1);

    /*
     * Modify I/O port access permissions.
     */
    /* Master Interrupt Controller (PIC). */
    rc |= ioports_deny_access(dom0, 0x20, 0x21);
    /* Slave Interrupt Controller (PIC). */
    rc |= ioports_deny_access(dom0, 0xA0, 0xA1);
    /* Interval Timer (PIT). */
    rc |= ioports_deny_access(dom0, 0x40, 0x43);
    /* PIT Channel 2 / PC Speaker Control. */
    rc |= ioports_deny_access(dom0, 0x61, 0x61);
    /* Command-line I/O ranges. */
    process_dom0_ioports_disable();

    /*
     * Modify I/O memory access permissions.
     */
    /* Local APIC. */
    if ( mp_lapic_addr != 0 )
    {
        mfn = paddr_to_pfn(mp_lapic_addr);
        rc |= iomem_deny_access(dom0, mfn, mfn);
    }
    /* I/O APICs. */
    for ( i = 0; i < nr_ioapics; i++ )
    {
        mfn = paddr_to_pfn(mp_ioapics[i].mpc_apicaddr);
        if ( smp_found_config )
            rc |= iomem_deny_access(dom0, mfn, mfn);
    }

    BUG_ON(rc != 0);

    return 0;
}

/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */