source: mainline/kernel/arch/ia32xen/src/boot/boot.S@ 8ccd2ea

#
# Copyright (c) 2006 Martin Decky
# All rights reserved.
#
# 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.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR 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.
#

#include <arch/mm/page.h>
#include <arch/hypercall.h>

#define ELFNOTE(name, type, desctype, descval) \
        .section .note.name; \
        .align 4; \
        .long 2f - 1f; \
        .long 4f - 3f; \
        .long type; \
        1:.asciz #name; \
        2:.align 4; \
        3:desctype descval; \
        4:.align 4

ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,                      .asciz, "HelenOS")
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,         .asciz, RELEASE)
ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,           .asciz, "xen-3.0")
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,                     .long,  PA2KA(BOOT_OFFSET))
ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,          .long,  0)
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,                         .long,  kernel_image_start)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE,        .long,  hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,                      .asciz, "auto_translated_physmap|supervisor_mode_kernel")
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,                      .asciz, "no")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER,                        .asciz, "generic")

.text

.code32
.align 4
.global kernel_image_start
        
kernel_image_start:
        # copy start_info (esi initialized by Xen)
        
        movl $start_info, %edi
        movl $START_INFO_SIZE >> 2, %ecx
        cld
        rep movsb
        
        # switch to temporal kernel stack
        
        movl $kernel_stack, %esp
        
        call arch_pre_main
        call main_bsp                                                           # never returns

        cli
        hlt

kernel_stack_bottom:
        .space TEMP_STACK_SIZE
kernel_stack:

.section K_TEXT_START, "aw", @progbits
.global hypercall_page
.org 0
hypercall_page:
        .space PAGE_SIZE

.global shared_info
.org 0x1000
shared_info:
        .space PAGE_SIZE

.global console_page
.org 0x2000
console_page:
        .space PAGE_SIZE

# Xen 3.0.3 ELF loader is somehow buggy
# thus this workaround
.global dummy_fill
dummy_fill:
        .space (1024 * 1024)