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#

# 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

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#   derived from this software without specific prior written permission.

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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

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#

#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

	set kernel_image_start, %o0

	/*

	 * Take over control of MMU.

	 *

	 * First, take over DMMU for which we don't need to issue

	 * any FLUSH instructions. Because of that, we can

	 * demap the old DTLB pretty straightforwardly.

	 */

	call take_over_tlb_and_tt

	nop

	wrpr %r0, 0, %pil

	call main_bsp

	nop

	/* Not reached. */

2:

	b 2b

	nop