#!/usr/bin/env python # # Copyright 2007 Neal Norwitz # Portions Copyright 2007 Google Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Tokenize C++ source code.""" __author__ = 'nnorwitz@google.com (Neal Norwitz)' try: # Python 3.x import builtins except ImportError: # Python 2.x import __builtin__ as builtins import sys from cpp import utils if not hasattr(builtins, 'set'): # Nominal support for Python 2.3. from sets import Set as set # Add $ as a valid identifier char since so much code uses it. _letters = 'abcdefghijklmnopqrstuvwxyz' VALID_IDENTIFIER_CHARS = set(_letters + _letters.upper() + '_0123456789$') HEX_DIGITS = set('0123456789abcdefABCDEF') INT_OR_FLOAT_DIGITS = set('01234567890eE-+') # C++0x string preffixes. _STR_PREFIXES = set(('R', 'u8', 'u8R', 'u', 'uR', 'U', 'UR', 'L', 'LR')) # Token types. UNKNOWN = 'UNKNOWN' SYNTAX = 'SYNTAX' CONSTANT = 'CONSTANT' NAME = 'NAME' PREPROCESSOR = 'PREPROCESSOR' # Where the token originated from. This can be used for backtracking. # It is always set to WHENCE_STREAM in this code. WHENCE_STREAM, WHENCE_QUEUE = range(2) class Token(object): """Data container to represent a C++ token. Tokens can be identifiers, syntax char(s), constants, or pre-processor directives. start contains the index of the first char of the token in the source end contains the index of the last char of the token in the source """ def __init__(self, token_type, name, start, end): self.token_type = token_type self.name = name self.start = start self.end = end self.whence = WHENCE_STREAM def __str__(self): if not utils.DEBUG: return 'Token(%r)' % self.name return 'Token(%r, %s, %s)' % (self.name, self.start, self.end) __repr__ = __str__ def _GetString(source, start, i): i = source.find('"', i+1) while source[i-1] == '\\': # Count the trailing backslashes. backslash_count = 1 j = i - 2 while source[j] == '\\': backslash_count += 1 j -= 1 # When trailing backslashes are even, they escape each other. if (backslash_count % 2) == 0: break i = source.find('"', i+1) return i + 1 def _GetChar(source, start, i): # NOTE(nnorwitz): may not be quite correct, should be good enough. i = source.find("'", i+1) while source[i-1] == '\\': # Need to special case '\\'. if (i - 2) > start and source[i-2] == '\\': break i = source.find("'", i+1) # Try to handle unterminated single quotes (in a #if 0 block). if i < 0: i = start return i + 1 def GetTokens(source): """Returns a sequence of Tokens. Args: source: string of C++ source code. Yields: Token that represents the next token in the source. """ # Cache various valid character sets for speed. valid_identifier_chars = VALID_IDENTIFIER_CHARS hex_digits = HEX_DIGITS int_or_float_digits = INT_OR_FLOAT_DIGITS int_or_float_digits2 = int_or_float_digits | set('.') # Only ignore errors while in a #if 0 block. ignore_errors = False count_ifs = 0 i = 0 end = len(source) while i < end: # Skip whitespace. while i < end and source[i].isspace(): i += 1 if i >= end: return token_type = UNKNOWN start = i c = source[i] if c.isalpha() or c == '_': # Find a string token. token_type = NAME while source[i] in valid_identifier_chars: i += 1 # String and character constants can look like a name if # they are something like L"". if (source[i] == "'" and (i - start) == 1 and source[start:i] in 'uUL'): # u, U, and L are valid C++0x character preffixes. token_type = CONSTANT i = _GetChar(source, start, i) elif source[i] == "'" and source[start:i] in _STR_PREFIXES: token_type = CONSTANT i = _GetString(source, start, i) elif c == '/' and source[i+1] == '/': # Find // comments. i = source.find('\n', i) if i == -1: # Handle EOF. i = end continue elif c == '/' and source[i+1] == '*': # Find /* comments. */ i = source.find('*/', i) + 2 continue elif c in ':+-<>&|*=': # : or :: (plus other chars). token_type = SYNTAX i += 1 new_ch = source[i] if new_ch == c and c != '>': # Treat ">>" as two tokens. i += 1 elif c == '-' and new_ch == '>': i += 1 elif new_ch == '=': i += 1 elif c in '()[]{}~!?^%;/.,': # Handle single char tokens. token_type = SYNTAX i += 1 if c == '.' and source[i].isdigit(): token_type = CONSTANT i += 1 while source[i] in int_or_float_digits: i += 1 # Handle float suffixes. for suffix in ('l', 'f'): if suffix == source[i:i+1].lower(): i += 1 break elif c.isdigit(): # Find integer. token_type = CONSTANT if c == '0' and source[i+1] in 'xX': # Handle hex digits. i += 2 while source[i] in hex_digits: i += 1 else: while source[i] in int_or_float_digits2: i += 1 # Handle integer (and float) suffixes. for suffix in ('ull', 'll', 'ul', 'l', 'f', 'u'): size = len(suffix) if suffix == source[i:i+size].lower(): i += size break elif c == '"': # Find string. token_type = CONSTANT i = _GetString(source, start, i) elif c == "'": # Find char. token_type = CONSTANT i = _GetChar(source, start, i) elif c == '#': # Find pre-processor command. token_type = PREPROCESSOR got_if = source[i:i+3] == '#if' and source[i+3:i+4].isspace() if got_if: count_ifs += 1 elif source[i:i+6] == '#endif': count_ifs -= 1 if count_ifs == 0: ignore_errors = False # TODO(nnorwitz): handle preprocessor statements (\ continuations). while 1: i1 = source.find('\n', i) i2 = source.find('//', i) i3 = source.find('/*', i) i4 = source.find('"', i) # NOTE(nnorwitz): doesn't handle comments in #define macros. # Get the first important symbol (newline, comment, EOF/end). i = min([x for x in (i1, i2, i3, i4, end) if x != -1]) # Handle #include "dir//foo.h" properly. if source[i] == '"': i = source.find('"', i+1) + 1 assert i > 0 continue # Keep going if end of the line and the line ends with \. if not (i == i1 and source[i-1] == '\\'): if got_if: condition = source[start+4:i].lstrip() if (condition.startswith('0') or condition.startswith('(0)')): ignore_errors = True break i += 1 elif c == '\\': # Handle \ in code. # This is different from the pre-processor \ handling. i += 1 continue elif ignore_errors: # The tokenizer seems to be in pretty good shape. This # raise is conditionally disabled so that bogus code # in an #if 0 block can be handled. Since we will ignore # it anyways, this is probably fine. So disable the # exception and return the bogus char. i += 1 else: sys.stderr.write('Got invalid token in %s @ %d token:%s: %r\n' % ('?', i, c, source[i-10:i+10])) raise RuntimeError('unexpected token') if i <= 0: print('Invalid index, exiting now.') return yield Token(token_type, source[start:i], start, i) if __name__ == '__main__': def main(argv): """Driver mostly for testing purposes.""" for filename in argv[1:]: source = utils.ReadFile(filename) if source is None: continue for token in GetTokens(source): print('%-12s: %s' % (token.token_type, token.name)) # print('\r%6.2f%%' % (100.0 * index / token.end),) sys.stdout.write('\n') main(sys.argv) 91'>191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 
/******************************************************************************
 * xc_hvm_build.c
 */

#define ELFSIZE 32
#include <stddef.h>
#include "xg_private.h"
#include "xc_elf.h"
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>
#include <xen/hvm/hvm_info_table.h>
#include <xen/hvm/ioreq.h>

#define HVM_LOADER_ENTR_ADDR  0x00100000

#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER)
#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#ifdef __x86_64__
#define L3_PROT (_PAGE_PRESENT)
#endif

#define E820MAX     128

#define E820_RAM          1
#define E820_RESERVED     2
#define E820_ACPI         3
#define E820_NVS          4
#define E820_IO          16
#define E820_SHARED_PAGE 17
#define E820_XENSTORE    18

#define E820_MAP_PAGE       0x00090000
#define E820_MAP_NR_OFFSET  0x000001E8
#define E820_MAP_OFFSET     0x000002D0

struct e820entry {
    uint64_t addr;
    uint64_t size;
    uint32_t type;
} __attribute__((packed));

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

static int
parseelfimage(
    char *elfbase, unsigned long elfsize, struct domain_setup_info *dsi);
static int
loadelfimage(
    char *elfbase, int xch, uint32_t dom, unsigned long *parray,
    struct domain_setup_info *dsi);

static unsigned char build_e820map(void *e820_page, unsigned long long mem_size)
{
    struct e820entry *e820entry =
        (struct e820entry *)(((unsigned char *)e820_page) + E820_MAP_OFFSET);
    unsigned char nr_map = 0;

    /* XXX: Doesn't work for > 4GB yet */
    e820entry[nr_map].addr = 0x0;
    e820entry[nr_map].size = 0x9F800;
    e820entry[nr_map].type = E820_RAM;
    nr_map++;

    e820entry[nr_map].addr = 0x9F800;
    e820entry[nr_map].size = 0x800;
    e820entry[nr_map].type = E820_RESERVED;
    nr_map++;

    e820entry[nr_map].addr = 0xA0000;
    e820entry[nr_map].size = 0x20000;
    e820entry[nr_map].type = E820_IO;
    nr_map++;

    e820entry[nr_map].addr = 0xF0000;
    e820entry[nr_map].size = 0x10000;
    e820entry[nr_map].type = E820_RESERVED;
    nr_map++;

#define STATIC_PAGES    2       /* for ioreq_t and store_mfn */
    /* Most of the ram goes here */
    e820entry[nr_map].addr = 0x100000;
    e820entry[nr_map].size = mem_size - 0x100000 - STATIC_PAGES * PAGE_SIZE;
    e820entry[nr_map].type = E820_RAM;
    nr_map++;

    /* Statically allocated special pages */

    /* For xenstore */
    e820entry[nr_map].addr = mem_size - 2 * PAGE_SIZE;
    e820entry[nr_map].size = PAGE_SIZE;
    e820entry[nr_map].type = E820_XENSTORE;
    nr_map++;

    /* Shared ioreq_t page */
    e820entry[nr_map].addr = mem_size - PAGE_SIZE;
    e820entry[nr_map].size = PAGE_SIZE;
    e820entry[nr_map].type = E820_SHARED_PAGE;
    nr_map++;

    e820entry[nr_map].addr = mem_size;
    e820entry[nr_map].size = 0x3 * PAGE_SIZE;
    e820entry[nr_map].type = E820_NVS;
    nr_map++;

    e820entry[nr_map].addr = mem_size + 0x3 * PAGE_SIZE;
    e820entry[nr_map].size = 0xA * PAGE_SIZE;
    e820entry[nr_map].type = E820_ACPI;
    nr_map++;

    e820entry[nr_map].addr = 0xFEC00000;
    e820entry[nr_map].size = 0x1400000;
    e820entry[nr_map].type = E820_IO;
    nr_map++;

    return (*(((unsigned char *)e820_page) + E820_MAP_NR_OFFSET) = nr_map);
}

static void set_hvm_info_checksum(struct hvm_info_table *t)
{
    uint8_t *ptr = (uint8_t *)t, sum = 0;
    unsigned int i;

    t->checksum = 0;

    for (i = 0; i < t->length; i++)
        sum += *ptr++;

    t->checksum = -sum;
}

/*
 * Use E820 reserved memory 0x9F800 to pass HVM info to hvmloader
 * hvmloader will use this info to set BIOS accordingly
 */
static int set_hvm_info(int xc_handle, uint32_t dom,
                        unsigned long *pfn_list, unsigned int vcpus,
                        unsigned int pae, unsigned int acpi, unsigned int apic)
{
    char *va_map;
    struct hvm_info_table *va_hvm;

    va_map = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
                                  PROT_READ | PROT_WRITE,
                                  pfn_list[HVM_INFO_PFN]);

    if ( va_map == NULL )
        return -1;

    va_hvm = (struct hvm_info_table *)(va_map + HVM_INFO_OFFSET);
    memset(va_hvm, 0, sizeof(*va_hvm));

    strncpy(va_hvm->signature, "HVM INFO", 8);
    va_hvm->length       = sizeof(struct hvm_info_table);
    va_hvm->acpi_enabled = acpi;
    va_hvm->apic_enabled = apic;
    va_hvm->pae_enabled  = pae;
    va_hvm->nr_vcpus     = vcpus;

    set_hvm_info_checksum(va_hvm);

    munmap(va_map, PAGE_SIZE);

    return 0;
}

static int setup_guest(int xc_handle,
                       uint32_t dom, int memsize,
                       char *image, unsigned long image_size,
                       unsigned long nr_pages,
                       vcpu_guest_context_t *ctxt,
                       unsigned long shared_info_frame,
                       unsigned int vcpus,
                       unsigned int pae,
                       unsigned int acpi,
                       unsigned int apic,
                       unsigned int store_evtchn,
                       unsigned long *store_mfn)
{
    unsigned long *page_array = NULL;
    unsigned long count, i;
    unsigned long long ptr;
    xc_mmu_t *mmu = NULL;

    shared_info_t *shared_info;
    void *e820_page;
    unsigned char e820_map_nr;

    struct domain_setup_info dsi;
    unsigned long long v_end;

    unsigned long shared_page_frame = 0;
    shared_iopage_t *sp;

    memset(&dsi, 0, sizeof(struct domain_setup_info));

    if ( (parseelfimage(image, image_size, &dsi)) != 0 )
        goto error_out;

    if ( (dsi.v_kernstart & (PAGE_SIZE - 1)) != 0 )
    {
        PERROR("Guest OS must load to a page boundary.\n");
        goto error_out;
    }

    /* memsize is in megabytes */
    v_end = (unsigned long long)memsize << 20;

    printf("VIRTUAL MEMORY ARRANGEMENT:\n"
           "  Loaded HVM loader:    %08lx->%08lx\n"
           "  TOTAL:                %08lx->%016llx\n",
           dsi.v_kernstart, dsi.v_kernend,
           dsi.v_start, v_end);
    printf("  ENTRY ADDRESS:        %08lx\n", dsi.v_kernentry);

    if ( (v_end - dsi.v_start) > ((unsigned long long)nr_pages << PAGE_SHIFT) )
    {
        PERROR("Initial guest OS requires too much space: "
               "(%lluMB is greater than %lluMB limit)\n",
               (unsigned long long)(v_end - dsi.v_start) >> 20,
               ((unsigned long long)nr_pages << PAGE_SHIFT) >> 20);
        goto error_out;
    }

    if ( (page_array = malloc(nr_pages * sizeof(unsigned long))) == NULL )
    {
        PERROR("Could not allocate memory.\n");
        goto error_out;
    }

    if ( xc_get_pfn_list(xc_handle, dom, page_array, nr_pages) != nr_pages )
    {
        PERROR("Could not get the page frame list.\n");
        goto error_out;
    }

    loadelfimage(image, xc_handle, dom, page_array, &dsi);

    if ( (mmu = xc_init_mmu_updates(xc_handle, dom)) == NULL )
        goto error_out;

    /* Write the machine->phys table entries. */
    for ( count = 0; count < nr_pages; count++ )
    {
        ptr = (unsigned long long)page_array[count] << PAGE_SHIFT;
        if ( xc_add_mmu_update(xc_handle, mmu,
                               ptr | MMU_MACHPHYS_UPDATE, count) )
            goto error_out;
    }

    if ( set_hvm_info(xc_handle, dom, page_array, vcpus, pae, acpi, apic) )
    {
        ERROR("Couldn't set hvm info for HVM guest.\n");
        goto error_out;
    }

    if ( (e820_page = xc_map_foreign_range(
              xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
              page_array[E820_MAP_PAGE >> PAGE_SHIFT])) == 0 )
        goto error_out;
    memset(e820_page, 0, PAGE_SIZE);
    e820_map_nr = build_e820map(e820_page, v_end);
    munmap(e820_page, PAGE_SIZE);

    /* shared_info page starts its life empty. */
    if ( (shared_info = xc_map_foreign_range(
              xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
              shared_info_frame)) == 0 )
        goto error_out;
    memset(shared_info, 0, sizeof(shared_info_t));
    /* Mask all upcalls... */
    for ( i = 0; i < MAX_VIRT_CPUS; i++ )
        shared_info->vcpu_info[i].evtchn_upcall_mask = 1;
    munmap(shared_info, PAGE_SIZE);

    /* Populate the event channel port in the shared page */
    shared_page_frame = page_array[(v_end >> PAGE_SHIFT) - 1];
    if ( (sp = (shared_iopage_t *) xc_map_foreign_range(
              xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
              shared_page_frame)) == 0 )
        goto error_out;
    memset(sp, 0, PAGE_SIZE);

    /* FIXME: how about if we overflow the page here? */
    for ( i = 0; i < vcpus; i++ ) {
        unsigned int vp_eport;

        vp_eport = xc_evtchn_alloc_unbound(xc_handle, dom, 0);
        if ( vp_eport < 0 ) {
            PERROR("Couldn't get unbound port from VMX guest.\n");
            goto error_out;
        }
        sp->vcpu_iodata[i].vp_eport = vp_eport;
    }

    munmap(sp, PAGE_SIZE);

    *store_mfn = page_array[(v_end >> PAGE_SHIFT) - 2];
    if ( xc_clear_domain_page(xc_handle, dom, *store_mfn) )
        goto error_out;

    /* Send the page update requests down to the hypervisor. */
    if ( xc_finish_mmu_updates(xc_handle, mmu) )
        goto error_out;

    free(mmu);
    free(page_array);

    /*
     * Initial register values:
     */
    ctxt->user_regs.ds = 0;
    ctxt->user_regs.es = 0;
    ctxt->user_regs.fs = 0;
    ctxt->user_regs.gs = 0;
    ctxt->user_regs.ss = 0;
    ctxt->user_regs.cs = 0;
    ctxt->user_regs.eip = dsi.v_kernentry;
    ctxt->user_regs.edx = 0;
    ctxt->user_regs.eax = 0;
    ctxt->user_regs.esp = 0;
    ctxt->user_regs.ebx = 0; /* startup_32 expects this to be 0 to signal boot cpu */
    ctxt->user_regs.ecx = 0;
    ctxt->user_regs.esi = 0;
    ctxt->user_regs.edi = 0;
    ctxt->user_regs.ebp = 0;

    ctxt->user_regs.eflags = 0;

    return 0;

 error_out:
    free(mmu);
    free(page_array);
    return -1;
}

static int xc_hvm_build_internal(int xc_handle,
                                 uint32_t domid,
                                 int memsize,
                                 char *image,
                                 unsigned long image_size,
                                 unsigned int vcpus,
                                 unsigned int pae,
                                 unsigned int acpi,
                                 unsigned int apic,
                                 unsigned int store_evtchn,
                                 unsigned long *store_mfn)
{
    dom0_op_t launch_op, op;
    int rc, i;
    vcpu_guest_context_t st_ctxt, *ctxt = &st_ctxt;
    unsigned long nr_pages;
    xen_capabilities_info_t xen_caps;

    if ( (image == NULL) || (image_size == 0) )
    {
        ERROR("Image required");
        goto error_out;
    }

    if ( (rc = xc_version(xc_handle, XENVER_capabilities, &xen_caps)) != 0 )
    {
        PERROR("Failed to get xen version info");
        goto error_out;
    }

    if ( !strstr(xen_caps, "hvm") )
    {
        PERROR("CPU doesn't support HVM extensions or "
               "the extensions are not enabled");
        goto error_out;
    }

    if ( (nr_pages = xc_get_tot_pages(xc_handle, domid)) < 0 )
    {
        PERROR("Could not find total pages for domain");
        goto error_out;
    }

    if ( mlock(&st_ctxt, sizeof(st_ctxt) ) )
    {
        PERROR("%s: ctxt mlock failed", __func__);
        return 1;
    }

    op.cmd = DOM0_GETDOMAININFO;
    op.u.getdomaininfo.domain = (domid_t)domid;
    if ( (xc_dom0_op(xc_handle, &op) < 0) ||
         ((uint16_t)op.u.getdomaininfo.domain != domid) )
    {
        PERROR("Could not get info on domain");
        goto error_out;
    }

    memset(ctxt, 0, sizeof(*ctxt));

    ctxt->flags = VGCF_HVM_GUEST;
    if ( setup_guest(xc_handle, domid, memsize, image, image_size, nr_pages,
                     ctxt, op.u.getdomaininfo.shared_info_frame,
                     vcpus, pae, acpi, apic, store_evtchn, store_mfn) < 0)
    {
        ERROR("Error constructing guest OS");
        goto error_out;
    }

    /* FPU is set up to default initial state. */
    memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));

    /* Virtual IDT is empty at start-of-day. */
    for ( i = 0; i < 256; i++ )
    {
        ctxt->trap_ctxt[i].vector = i;
        ctxt->trap_ctxt[i].cs     = FLAT_KERNEL_CS;
    }

    /* No LDT. */
    ctxt->ldt_ents = 0;

    /* Use the default Xen-provided GDT. */
    ctxt->gdt_ents = 0;

    /* No debugging. */
    memset(ctxt->debugreg, 0, sizeof(ctxt->debugreg));

    /* No callback handlers. */
#if defined(__i386__)
    ctxt->event_callback_cs     = FLAT_KERNEL_CS;
    ctxt->event_callback_eip    = 0;
    ctxt->failsafe_callback_cs  = FLAT_KERNEL_CS;
    ctxt->failsafe_callback_eip = 0;
#elif defined(__x86_64__)
    ctxt->event_callback_eip    = 0;
    ctxt->failsafe_callback_eip = 0;
    ctxt->syscall_callback_eip  = 0;
#endif

    memset( &launch_op, 0, sizeof(launch_op) );

    launch_op.u.setvcpucontext.domain = (domid_t)domid;
    launch_op.u.setvcpucontext.vcpu   = 0;
    set_xen_guest_handle(launch_op.u.setvcpucontext.ctxt, ctxt);

    launch_op.cmd = DOM0_SETVCPUCONTEXT;
    rc = xc_dom0_op(xc_handle, &launch_op);

    return rc;

 error_out:
    return -1;
}

static inline int is_loadable_phdr(Elf32_Phdr *phdr)
{
    return ((phdr->p_type == PT_LOAD) &&
            ((phdr->p_flags & (PF_W|PF_X)) != 0));
}

static int parseelfimage(char *elfbase,
                         unsigned long elfsize,
                         struct domain_setup_info *dsi)
{
    Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfbase;
    Elf32_Phdr *phdr;
    Elf32_Shdr *shdr;
    unsigned long kernstart = ~0UL, kernend=0UL;
    char *shstrtab;
    int h;

    if ( !IS_ELF(*ehdr) )
    {
        ERROR("Kernel image does not have an ELF header.");
        return -EINVAL;
    }

    if ( (ehdr->e_phoff + (ehdr->e_phnum * ehdr->e_phentsize)) > elfsize )
    {
        ERROR("ELF program headers extend beyond end of image.");
        return -EINVAL;
    }

    if ( (ehdr->e_shoff + (ehdr->e_shnum * ehdr->e_shentsize)) > elfsize )
    {
        ERROR("ELF section headers extend beyond end of image.");
        return -EINVAL;
    }

    /* Find the section-header strings table. */
    if ( ehdr->e_shstrndx == SHN_UNDEF )
    {
        ERROR("ELF image has no section-header strings table (shstrtab).");
        return -EINVAL;
    }
    shdr = (Elf32_Shdr *)(elfbase + ehdr->e_shoff +
                          (ehdr->e_shstrndx*ehdr->e_shentsize));
    shstrtab = elfbase + shdr->sh_offset;

    for ( h = 0; h < ehdr->e_phnum; h++ )
    {
        phdr = (Elf32_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
        if ( !is_loadable_phdr(phdr) )
            continue;
        if ( phdr->p_paddr < kernstart )
            kernstart = phdr->p_paddr;
        if ( (phdr->p_paddr + phdr->p_memsz) > kernend )
            kernend = phdr->p_paddr + phdr->p_memsz;
    }

    if ( (kernstart > kernend) ||
         (ehdr->e_entry < kernstart) ||
         (ehdr->e_entry > kernend) )
    {
        ERROR("Malformed ELF image.");
        return -EINVAL;
    }

    dsi->v_start = 0x00000000;

    dsi->v_kernstart = kernstart;
    dsi->v_kernend   = kernend;
    dsi->v_kernentry = HVM_LOADER_ENTR_ADDR;

    dsi->v_end       = dsi->v_kernend;

    return 0;
}

static int
loadelfimage(
    char *elfbase, int xch, uint32_t dom, unsigned long *parray,
    struct domain_setup_info *dsi)
{
    Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfbase;
    Elf32_Phdr *phdr;
    int h;

    char         *va;
    unsigned long pa, done, chunksz;

    for ( h = 0; h < ehdr->e_phnum; h++ )
    {
        phdr = (Elf32_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
        if ( !is_loadable_phdr(phdr) )
            continue;

        for ( done = 0; done < phdr->p_filesz; done += chunksz )
        {
            pa = (phdr->p_paddr + done) - dsi->v_start;
            if ((va = xc_map_foreign_range(
                xch, dom, PAGE_SIZE, PROT_WRITE,
                parray[pa >> PAGE_SHIFT])) == 0)
                return -1;
            chunksz = phdr->p_filesz - done;
            if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
                chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
            memcpy(va + (pa & (PAGE_SIZE-1)),
                   elfbase + phdr->p_offset + done, chunksz);
            munmap(va, PAGE_SIZE);
        }

        for ( ; done < phdr->p_memsz; done += chunksz )
        {
            pa = (phdr->p_paddr + done) - dsi->v_start;
            if ((va = xc_map_foreign_range(
                xch, dom, PAGE_SIZE, PROT_WRITE,
                parray[pa >> PAGE_SHIFT])) == 0)
                return -1;
            chunksz = phdr->p_memsz - done;
            if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
                chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
            memset(va + (pa & (PAGE_SIZE-1)), 0, chunksz);
            munmap(va, PAGE_SIZE);
        }
    }

    return 0;
}

/* xc_hvm_build
 *
 * Create a domain for a virtualized Linux, using files/filenames
 *
 */

int xc_hvm_build(int xc_handle,
                 uint32_t domid,
                 int memsize,
                 const char *image_name,
                 unsigned int vcpus,
                 unsigned int pae,
                 unsigned int acpi,
                 unsigned int apic,
                 unsigned int store_evtchn,
                 unsigned long *store_mfn)
{
    char *image;
    int  sts;
    unsigned long image_size;

    if ( (image_name == NULL) ||
         ((image = xc_read_image(image_name, &image_size)) == NULL) )
        return -1;

    sts = xc_hvm_build_internal(xc_handle, domid, memsize,
                                image, image_size,
                                vcpus, pae, acpi, apic,
                                store_evtchn, store_mfn);

    free(image);

    return sts;
}

/* xc_hvm_build_mem
 *
 * Create a domain for a virtualized Linux, using buffers
 *
 */

int xc_hvm_build_mem(int xc_handle,
                     uint32_t domid,
                     int memsize,
                     const char *image_buffer,
                     unsigned long image_size,
                     unsigned int vcpus,
                     unsigned int pae,
                     unsigned int acpi,
                     unsigned int apic,
                     unsigned int store_evtchn,
                     unsigned long *store_mfn)
{
    int           sts;
    unsigned long img_len;
    char         *img;

    /* Validate that there is a kernel buffer */

    if ( (image_buffer == NULL) || (image_size == 0) )
    {
        ERROR("kernel image buffer not present");
        return -1;
    }

    img = xc_inflate_buffer(image_buffer, image_size, &img_len);
    if (img == NULL)
    {
        ERROR("unable to inflate ram disk buffer");
        return -1;
    }

    sts = xc_hvm_build_internal(xc_handle, domid, memsize,
                                img, img_len,
                                vcpus, pae, acpi, apic,
                                store_evtchn, store_mfn);

    /* xc_inflate_buffer may return the original buffer pointer (for
       for already inflated buffers), so exercise some care in freeing */

    if ( (img != NULL) && (img != image_buffer) )
        free(img);

    return sts;
}

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