Subversion Repositories HelenOS

#

# Copyright (C) 2005 Jakub Jermar

# 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/regdef.h>

.register %g2, #scratch

.register %g3, #scratch

.register %g6, #scratch

.register %g7, #scratch

.section K_TEXT_START, "ax"

/*

 * Here is where the kernel is passed control

 * from the boot loader.

 * 

 * The registers are expected to be in this state:

 * - %o0 bootinfo structure address

 * - %o1 bootinfo structure size

 *

 * Moreover, we depend on boot having established the

 * following environment:

 * - TLBs are on

 * - identity mapping for the kernel image

 * - identity mapping for memory stack

 */

.global kernel_image_start

kernel_image_start:

	flushw				! flush all but the active register window

	/*

	 * Disable interrupts and disable 32-bit address masking.

	 */

	rdpr %pstate, %l0

	and %l0, ~(PSTATE_AM_BIT|PSTATE_IE_BIT), %l0

	wrpr %l0, 0, %pstate

	/*

	 * Copy the bootinfo structure passed from the boot loader

	 * to the kernel bootinfo structure.

	 */

	mov %o1, %o2

	mov %o0, %o1

	set bootinfo, %o0

	call memcpy

	nop

	/*

	 * Take over control of identity mapping.

	 * Take over control of trap table.

	 *

	 * After this call, the kernel is entirely self-sufficient

	 * and independent on OpenFirmware.

	 */

	set kernel_image_start, %o0

	call take_over_tlb_and_tt

	nop

	wrpr %r0, 0, %pil

	call main_bsp

	nop

	/* Not reached. */

2:

	b 2b

	nop