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#
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#
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# Copyright (C) 2005 Jakub Jermar
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# Copyright (C) 2005 Jakub Jermar
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#
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#
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# - Redistributions of source code must retain the above copyright
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/regdef.h>
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#include <arch/regdef.h>
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.register %g2, #scratch
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.register %g2, #scratch
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.register %g3, #scratch
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.register %g3, #scratch
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.register %g6, #scratch
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.register %g6, #scratch
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.register %g7, #scratch
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.register %g7, #scratch
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.section K_TEXT_START, "ax"
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.section K_TEXT_START, "ax"
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/*
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/*
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 * Here is where the kernel is passed control
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 * Here is where the kernel is passed control
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 * from the boot loader.
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 * from the boot loader.
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 *
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 *
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 * The registers are expected to be in this state:
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 * The registers are expected to be in this state:
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 * %o0 bootinfo structure address
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 * - %o0 bootinfo structure address
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 * %o1 bootinfo structure size
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 * - %o1 bootinfo structure size
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 *
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 * Moreover, we depend on boot having established the
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 * following environment:
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 * - TLBs are on
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 * - identity mapping for the kernel image
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 * - identity mapping for memory stack
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 */
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 */
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.global kernel_image_start
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.global kernel_image_start
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kernel_image_start:
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kernel_image_start:
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	flushw				! flush all but the active register window
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	flushw				! flush all but the active register window
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	/*
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	/*
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	 * Disable interrupts and disable 32-bit address masking.
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	 * Disable interrupts and disable 32-bit address masking.
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	 */
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	 */
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	rdpr %pstate, %l0
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	rdpr %pstate, %l0
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	and %l0, ~(PSTATE_AM_BIT|PSTATE_IE_BIT), %l0
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	and %l0, ~(PSTATE_AM_BIT|PSTATE_IE_BIT), %l0
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	wrpr %l0, 0, %pstate
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	wrpr %l0, 0, %pstate
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	/*
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	/*
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	 * Copy the bootinfo structure passed from the boot loader
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	 * Copy the bootinfo structure passed from the boot loader
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	 * to the kernel bootinfo structure.
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	 * to the kernel bootinfo structure.
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	 */
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	 */
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	mov %o1, %o2
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	mov %o1, %o2
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	mov %o0, %o1
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	mov %o0, %o1
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	set bootinfo, %o0
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	set bootinfo, %o0
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	call memcpy
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	call memcpy
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	nop
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	nop
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	/*
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	 * Take over control of identity mapping.
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	 * Take over control of trap table.
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	 *
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	 * After this call, the kernel is entirely self-sufficient
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	 * and independent on OpenFirmware.
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	 */
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	set kernel_image_start, %o0
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	call take_over_tlb_and_tt
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	nop
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	wrpr %r0, 0, %pil
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	wrpr %r0, 0, %pil
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	call main_bsp
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	call main_bsp
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	nop
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	nop
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	/* Not reached. */
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	/* Not reached. */
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2:
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2:
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	b 2b
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	b 2b
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	nop
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	nop
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