#
# 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
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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