[linux.git] / arch / mn10300 / kernel / head.S

/* Boot entry point for MN10300 kernel
 *
 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/threads.h>
#include <linux/linkage.h>
#include <linux/serial_reg.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/frame.inc>
#include <asm/param.h>
#include <unit/serial.h>
#ifdef CONFIG_SMP
#include <asm/smp.h>
#include <asm/intctl-regs.h>
#include <asm/cpu-regs.h>
#include <proc/smp-regs.h>
#endif /* CONFIG_SMP */

	__HEAD

###############################################################################
#
# bootloader entry point
#
###############################################################################
	.globl	_start
	.type	_start,@function
_start:
#ifdef CONFIG_SMP
	#
	# If this is a secondary CPU (AP), then deal with that elsewhere
	#
	mov	(CPUID),d3
	and	CPUID_MASK,d3
	bne	startup_secondary

	#
	# We're dealing with the primary CPU (BP) here, then.
	# Keep BP's D0,D1,D2 register for boot check.
	#

	# Set up the Boot IPI for each secondary CPU
	mov	0x1,a0
loop_set_secondary_icr:
	mov	a0,a1
	asl	CROSS_ICR_CPU_SHIFT,a1
	add	CROSS_GxICR(SMP_BOOT_IRQ,0),a1
	movhu	(a1),d3
	or	GxICR_ENABLE|GxICR_LEVEL_0,d3
	movhu	d3,(a1)
	movhu	(a1),d3				# flush
	inc	a0
	cmp	NR_CPUS,a0
	bne	loop_set_secondary_icr
#endif /* CONFIG_SMP */

	# save commandline pointer
	mov	d0,a3

	# preload the PGD pointer register
	mov	swapper_pg_dir,d0
	mov	d0,(PTBR)
	clr	d0
	movbu	d0,(PIDR)

	# turn on the TLBs
	mov	MMUCTR_IIV|MMUCTR_DIV,d0
	mov	d0,(MMUCTR)
#ifdef CONFIG_AM34_2
	mov	MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE|MMUCTR_WTE,d0
#else
	mov	MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE,d0
#endif
	mov	d0,(MMUCTR)

	# turn on AM33v2 exception handling mode and set the trap table base
	movhu	(CPUP),d0
	or	CPUP_EXM_AM33V2,d0
	movhu	d0,(CPUP)
	mov	CONFIG_INTERRUPT_VECTOR_BASE,d0
	mov	d0,(TBR)

	# invalidate and enable both of the caches
#ifdef CONFIG_SMP
	mov	ECHCTR,a0
	clr	d0
	mov	d0,(a0)
#endif
	mov	CHCTR,a0
	clr	d0
	movhu	d0,(a0)					# turn off first
	mov	CHCTR_ICINV|CHCTR_DCINV,d0
	movhu	d0,(a0)
	setlb
	mov	(a0),d0
	btst	CHCTR_ICBUSY|CHCTR_DCBUSY,d0		# wait till not busy
	lne

#ifdef CONFIG_MN10300_CACHE_ENABLED
#ifdef CONFIG_MN10300_CACHE_WBACK
#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0
#else
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK|CHCTR_DCALMD,d0
#endif /* NOWRALLOC */
#else
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0
#endif /* WBACK */
	movhu	d0,(a0)					# enable
#endif /* ENABLED */

	# turn on RTS on the debug serial port if applicable
#ifdef CONFIG_MN10300_UNIT_ASB2305
	bset	UART_MCR_RTS,(ASB2305_DEBUG_MCR)
#endif

	# clear the BSS area
	mov	__bss_start,a0
	mov	__bss_stop,a1
	clr	d0
bssclear:
	cmp	a1,a0
	bge	bssclear_end
	mov	d0,(a0)
	inc4	a0
	bra	bssclear
bssclear_end:

	# retrieve the parameters (including command line) before we overwrite
	# them
	cmp	0xabadcafe,d1
	bne	__no_parameters

__copy_parameters:
	mov	redboot_command_line,a0
	mov	a0,a1
	add	COMMAND_LINE_SIZE,a1
1:
	movbu	(a3),d0
	inc	a3
	movbu	d0,(a0)
	inc	a0
	cmp	a1,a0
	blt	1b

	mov	redboot_platform_name,a0
	mov	a0,a1
	add	COMMAND_LINE_SIZE,a1
	mov	d2,a3
1:
	movbu	(a3),d0
	inc	a3
	movbu	d0,(a0)
	inc	a0
	cmp	a1,a0
	blt	1b

__no_parameters:

	# set up the registers with recognisable rubbish in them
	mov	init_thread_union+THREAD_SIZE-12,sp

	mov	0xea01eaea,d0
	mov	d0,(4,sp)		# EPSW save area
	mov	0xea02eaea,d0
	mov	d0,(8,sp)		# PC save area

	mov	0xeb0060ed,d0
	mov	d0,mdr
	mov	0xeb0061ed,d0
	mov	d0,mdrq
	mov	0xeb0062ed,d0
	mov	d0,mcrh
	mov	0xeb0063ed,d0
	mov	d0,mcrl
	mov	0xeb0064ed,d0
	mov	d0,mcvf
	mov	0xed0065ed,a3
	mov	a3,usp

	mov	0xed00e0ed,e0
	mov	0xed00e1ed,e1
	mov	0xed00e2ed,e2
	mov	0xed00e3ed,e3
	mov	0xed00e4ed,e4
	mov	0xed00e5ed,e5
	mov	0xed00e6ed,e6
	mov	0xed00e7ed,e7

	mov	0xed00d0ed,d0
	mov	0xed00d1ed,d1
	mov	0xed00d2ed,d2
	mov	0xed00d3ed,d3
	mov	0xed00a0ed,a0
	mov	0xed00a1ed,a1
	mov	0xed00a2ed,a2
	mov	0,a3

	# set up the initial kernel stack
	SAVE_ALL
	mov	0xffffffff,d0
	mov	d0,(REG_ORIG_D0,fp)

	# put different recognisable rubbish in the regs
	mov	0xfb0060ed,d0
	mov	d0,mdr
	mov	0xfb0061ed,d0
	mov	d0,mdrq
	mov	0xfb0062ed,d0
	mov	d0,mcrh
	mov	0xfb0063ed,d0
	mov	d0,mcrl
	mov	0xfb0064ed,d0
	mov	d0,mcvf
	mov	0xfd0065ed,a0
	mov	a0,usp

	mov	0xfd00e0ed,e0
	mov	0xfd00e1ed,e1
	mov	0xfd00e2ed,e2
	mov	0xfd00e3ed,e3
	mov	0xfd00e4ed,e4
	mov	0xfd00e5ed,e5
	mov	0xfd00e6ed,e6
	mov	0xfd00e7ed,e7

	mov	0xfd00d0ed,d0
	mov	0xfd00d1ed,d1
	mov	0xfd00d2ed,d2
	mov	0xfd00d3ed,d3
	mov	0xfd00a0ed,a0
	mov	0xfd00a1ed,a1
	mov	0xfd00a2ed,a2

	# we may be holding current in E2
#ifdef CONFIG_MN10300_CURRENT_IN_E2
	mov	init_task,e2
#endif

	# initialise the processor and the unit
	call	processor_init[],0
	call	unit_init[],0

#ifdef CONFIG_SMP
	# mark the primary CPU in cpu_boot_map
	mov	cpu_boot_map,a0
	mov	0x1,d0
	mov	d0,(a0)

	# signal each secondary CPU to begin booting
	mov	0x1,d2				# CPU ID

loop_request_boot_secondary:
	mov	d2,a0
	# send SMP_BOOT_IPI to secondary CPU
	asl	CROSS_ICR_CPU_SHIFT,a0
	add	CROSS_GxICR(SMP_BOOT_IRQ,0),a0
	movhu	(a0),d0
	or	GxICR_REQUEST|GxICR_DETECT,d0
	movhu	d0,(a0)
	movhu	(a0),d0				# flush

	# wait up to 100ms for AP's IPI to be received
	clr	d3
wait_on_secondary_boot:
	mov	DELAY_TIME_BOOT_IPI,d0
	call	__delay[],0
	inc	d3
	mov	cpu_boot_map,a0
	mov	(a0),d0
	lsr	d2,d0
	btst	0x1,d0
	bne	1f
	cmp	TIME_OUT_COUNT_BOOT_IPI,d3
	bne	wait_on_secondary_boot
1:
	inc	d2
	cmp	NR_CPUS,d2
	bne	loop_request_boot_secondary
#endif /* CONFIG_SMP */

#ifdef CONFIG_GDBSTUB
	call	gdbstub_init[],0

#ifdef CONFIG_GDBSTUB_IMMEDIATE
	.globl	__gdbstub_pause
__gdbstub_pause:
	bra	__gdbstub_pause
#endif
#endif

	jmp	start_kernel
	.size	_start,.-_start

###############################################################################
#
# Secondary CPU boot point
#
###############################################################################
#ifdef CONFIG_SMP
startup_secondary:
	# preload the PGD pointer register
	mov	swapper_pg_dir,d0
	mov	d0,(PTBR)
	clr	d0
	movbu	d0,(PIDR)

	# turn on the TLBs
	mov	MMUCTR_IIV|MMUCTR_DIV,d0
	mov	d0,(MMUCTR)
#ifdef CONFIG_AM34_2
	mov	MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE|MMUCTR_WTE,d0
#else
	mov	MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE,d0
#endif
	mov	d0,(MMUCTR)

	# turn on AM33v2 exception handling mode and set the trap table base
	movhu	(CPUP),d0
	or	CPUP_EXM_AM33V2,d0
	movhu	d0,(CPUP)

	# set the interrupt vector table
	mov	CONFIG_INTERRUPT_VECTOR_BASE,d0
	mov	d0,(TBR)

	# invalidate and enable both of the caches
	mov	ECHCTR,a0
	clr	d0
	mov	d0,(a0)
	mov	CHCTR,a0
	clr	d0
	movhu	d0,(a0)					# turn off first
	mov	CHCTR_ICINV|CHCTR_DCINV,d0
	movhu	d0,(a0)
	setlb
	mov	(a0),d0
	btst	CHCTR_ICBUSY|CHCTR_DCBUSY,d0		# wait till not busy (use CPU loop buffer)
	lne

#ifdef CONFIG_MN10300_CACHE_ENABLED
#ifdef  CONFIG_MN10300_CACHE_WBACK
#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0
#else
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK|CHCTR_DCALMD,d0
#endif  /* !NOWRALLOC */
#else
	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0
#endif  /* WBACK */
	movhu	d0,(a0)					# enable
#endif  /* ENABLED */

	# Clear the boot IPI interrupt for this CPU
	movhu	(GxICR(SMP_BOOT_IRQ)),d0
	and	~GxICR_REQUEST,d0
	movhu	d0,(GxICR(SMP_BOOT_IRQ))
	movhu	(GxICR(SMP_BOOT_IRQ)),d0		# flush

	/* get stack */
	mov	CONFIG_INTERRUPT_VECTOR_BASE + CONFIG_BOOT_STACK_OFFSET,a0
	mov	(CPUID),d0
	and	CPUID_MASK,d0
	mulu	CONFIG_BOOT_STACK_SIZE,d0
	sub	d0,a0
	mov	a0,sp

	# init interrupt for AP
	call	smp_prepare_cpu_init[],0

	# mark this secondary CPU in cpu_boot_map
	mov	(CPUID),d0
	mov	0x1,d1
	asl	d0,d1
	mov	cpu_boot_map,a0
	bset	d1,(a0)

	or	EPSW_IE|EPSW_IM_1,epsw  # permit level 0 interrupts
	nop
	nop
#ifdef  CONFIG_MN10300_CACHE_WBACK
	# flush the local cache if it's in writeback mode
	call	mn10300_local_dcache_flush_inv[],0
	setlb
	mov	(CHCTR),d0
	btst	CHCTR_DCBUSY,d0		# wait till not busy (use CPU loop buffer)
	lne
#endif

	# now sleep waiting for further instructions
secondary_sleep:
	mov	CPUM_SLEEP,d0
	movhu	d0,(CPUM)
	nop
	nop
	bra	secondary_sleep
	.size	startup_secondary,.-startup_secondary
#endif /* CONFIG_SMP */

###############################################################################
#
#
#
###############################################################################
ENTRY(__head_end)

/*
 * This is initialized to disallow all access to the low 2G region
 * - the high 2G region is managed directly by the MMU
 * - range 0x70000000-0x7C000000 are initialised for use by VMALLOC
 */
	.section .bss
	.balign PAGE_SIZE
ENTRY(swapper_pg_dir)
        .space PTRS_PER_PGD*4

/*
 * The page tables are initialized to only 8MB here - the final page
 * tables are set up later depending on memory size.
 */

	.balign PAGE_SIZE
ENTRY(empty_zero_page)
	.space PAGE_SIZE

	.balign PAGE_SIZE
ENTRY(empty_bad_page)
	.space PAGE_SIZE

	.balign PAGE_SIZE
ENTRY(empty_bad_pte_table)
	.space PAGE_SIZE

	.balign PAGE_SIZE
ENTRY(large_page_table)
	.space PAGE_SIZE

	.balign PAGE_SIZE
ENTRY(kernel_vmalloc_ptes)
	.space ((VMALLOC_END-VMALLOC_START)/PAGE_SIZE)*4
Commit	Line	Data
b920de1b DH	1	/* Boot entry point for MN10300 kernel
	2	*
	3	* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells ([email protected])
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
9760f8fc	12	#include <linux/init.h>
b920de1b DH	13	#include <linux/threads.h>
	14	#include <linux/linkage.h>
	15	#include <linux/serial_reg.h>
	16	#include <asm/thread_info.h>
	17	#include <asm/page.h>
	18	#include <asm/pgtable.h>
	19	#include <asm/frame.inc>
	20	#include <asm/param.h>
2f2a2132	21	#include <unit/serial.h>
368dd5ac AT	22	#ifdef CONFIG_SMP
	23	#include <asm/smp.h>
	24	#include <asm/intctl-regs.h>
	25	#include <asm/cpu-regs.h>
	26	#include <proc/smp-regs.h>
	27	#endif /* CONFIG_SMP */
b920de1b	28
9760f8fc	29	__HEAD
b920de1b DH	30
	31	###############################################################################
	32	#
	33	# bootloader entry point
	34	#
	35	###############################################################################
	36	.globl _start
	37	.type _start,@function
	38	_start:
368dd5ac AT	39	#ifdef CONFIG_SMP
	40	#
	41	# If this is a secondary CPU (AP), then deal with that elsewhere
	42	#
	43	mov (CPUID),d3
	44	and CPUID_MASK,d3
	45	bne startup_secondary
	46
	47	#
	48	# We're dealing with the primary CPU (BP) here, then.
	49	# Keep BP's D0,D1,D2 register for boot check.
	50	#
	51
	52	# Set up the Boot IPI for each secondary CPU
	53	mov 0x1,a0
	54	loop_set_secondary_icr:
	55	mov a0,a1
	56	asl CROSS_ICR_CPU_SHIFT,a1
	57	add CROSS_GxICR(SMP_BOOT_IRQ,0),a1
	58	movhu (a1),d3
	59	or GxICR_ENABLE\|GxICR_LEVEL_0,d3
	60	movhu d3,(a1)
	61	movhu (a1),d3 # flush
	62	inc a0
	63	cmp NR_CPUS,a0
	64	bne loop_set_secondary_icr
	65	#endif /* CONFIG_SMP */
	66
b920de1b DH	67	# save commandline pointer
	68	mov d0,a3
	69
	70	# preload the PGD pointer register
	71	mov swapper_pg_dir,d0
	72	mov d0,(PTBR)
368dd5ac AT	73	clr d0
368dd5ac AT	74	movbu d0,(PIDR)
b920de1b DH	75
	76	# turn on the TLBs
	77	mov MMUCTR_IIV\|MMUCTR_DIV,d0
	78	mov d0,(MMUCTR)
368dd5ac AT	79	#ifdef CONFIG_AM34_2
	80	mov MMUCTR_ITE\|MMUCTR_DTE\|MMUCTR_CE\|MMUCTR_WTE,d0
	81	#else
b920de1b	82	mov MMUCTR_ITE\|MMUCTR_DTE\|MMUCTR_CE,d0
368dd5ac	83	#endif
b920de1b DH	84	mov d0,(MMUCTR)
	85
	86	# turn on AM33v2 exception handling mode and set the trap table base
	87	movhu (CPUP),d0
	88	or CPUP_EXM_AM33V2,d0
	89	movhu d0,(CPUP)
	90	mov CONFIG_INTERRUPT_VECTOR_BASE,d0
	91	mov d0,(TBR)
	92
	93	# invalidate and enable both of the caches
368dd5ac AT	94	#ifdef CONFIG_SMP
	95	mov ECHCTR,a0
	96	clr d0
	97	mov d0,(a0)
	98	#endif
b920de1b DH	99	mov CHCTR,a0
	100	clr d0
	101	movhu d0,(a0) # turn off first
	102	mov CHCTR_ICINV\|CHCTR_DCINV,d0
	103	movhu d0,(a0)
	104	setlb
	105	mov (a0),d0
	106	btst CHCTR_ICBUSY\|CHCTR_DCBUSY,d0 # wait till not busy
	107	lne
	108
344af921	109	#ifdef CONFIG_MN10300_CACHE_ENABLED
b920de1b DH	110	#ifdef CONFIG_MN10300_CACHE_WBACK
	111	#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
	112	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRBACK,d0
	113	#else
	114	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRBACK\|CHCTR_DCALMD,d0
344af921	115	#endif /* NOWRALLOC */
b920de1b DH	116	#else
	117	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRTHROUGH,d0
	118	#endif /* WBACK */
	119	movhu d0,(a0) # enable
344af921	120	#endif /* ENABLED */
b920de1b DH	121
	122	# turn on RTS on the debug serial port if applicable
	123	#ifdef CONFIG_MN10300_UNIT_ASB2305
	124	bset UART_MCR_RTS,(ASB2305_DEBUG_MCR)
	125	#endif
	126
	127	# clear the BSS area
	128	mov __bss_start,a0
	129	mov __bss_stop,a1
	130	clr d0
	131	bssclear:
	132	cmp a1,a0
	133	bge bssclear_end
	134	mov d0,(a0)
	135	inc4 a0
	136	bra bssclear
	137	bssclear_end:
	138
	139	# retrieve the parameters (including command line) before we overwrite
	140	# them
	141	cmp 0xabadcafe,d1
	142	bne __no_parameters
	143
	144	__copy_parameters:
	145	mov redboot_command_line,a0
	146	mov a0,a1
	147	add COMMAND_LINE_SIZE,a1
	148	1:
	149	movbu (a3),d0
	150	inc a3
	151	movbu d0,(a0)
	152	inc a0
	153	cmp a1,a0
	154	blt 1b
	155
	156	mov redboot_platform_name,a0
	157	mov a0,a1
	158	add COMMAND_LINE_SIZE,a1
	159	mov d2,a3
	160	1:
	161	movbu (a3),d0
	162	inc a3
	163	movbu d0,(a0)
	164	inc a0
	165	cmp a1,a0
	166	blt 1b
	167
	168	__no_parameters:
	169
	170	# set up the registers with recognisable rubbish in them
	171	mov init_thread_union+THREAD_SIZE-12,sp
	172
	173	mov 0xea01eaea,d0
	174	mov d0,(4,sp) # EPSW save area
	175	mov 0xea02eaea,d0
	176	mov d0,(8,sp) # PC save area
	177
	178	mov 0xeb0060ed,d0
	179	mov d0,mdr
	180	mov 0xeb0061ed,d0
	181	mov d0,mdrq
	182	mov 0xeb0062ed,d0
	183	mov d0,mcrh
	184	mov 0xeb0063ed,d0
185	mov d0,mcrl
186	mov 0xeb0064ed,d0
187	mov d0,mcvf
188	mov 0xed0065ed,a3
189	mov a3,usp
190
191	mov 0xed00e0ed,e0
192	mov 0xed00e1ed,e1
193	mov 0xed00e2ed,e2
194	mov 0xed00e3ed,e3
195	mov 0xed00e4ed,e4
196	mov 0xed00e5ed,e5
197	mov 0xed00e6ed,e6
198	mov 0xed00e7ed,e7
199
200	mov 0xed00d0ed,d0
201	mov 0xed00d1ed,d1
202	mov 0xed00d2ed,d2
203	mov 0xed00d3ed,d3
204	mov 0xed00a0ed,a0
205	mov 0xed00a1ed,a1
206	mov 0xed00a2ed,a2
207	mov 0,a3
208
209	# set up the initial kernel stack
210	SAVE_ALL
211	mov 0xffffffff,d0
212	mov d0,(REG_ORIG_D0,fp)
213
214	# put different recognisable rubbish in the regs
215	mov 0xfb0060ed,d0
216	mov d0,mdr
217	mov 0xfb0061ed,d0
218	mov d0,mdrq
219	mov 0xfb0062ed,d0
220	mov d0,mcrh
221	mov 0xfb0063ed,d0
222	mov d0,mcrl
223	mov 0xfb0064ed,d0
224	mov d0,mcvf
225	mov 0xfd0065ed,a0
226	mov a0,usp
227
228	mov 0xfd00e0ed,e0
229	mov 0xfd00e1ed,e1
230	mov 0xfd00e2ed,e2
231	mov 0xfd00e3ed,e3
232	mov 0xfd00e4ed,e4
233	mov 0xfd00e5ed,e5
234	mov 0xfd00e6ed,e6
235	mov 0xfd00e7ed,e7
236
237	mov 0xfd00d0ed,d0
238	mov 0xfd00d1ed,d1
239	mov 0xfd00d2ed,d2
240	mov 0xfd00d3ed,d3
241	mov 0xfd00a0ed,a0
242	mov 0xfd00a1ed,a1
243	mov 0xfd00a2ed,a2
244
245	# we may be holding current in E2
246	#ifdef CONFIG_MN10300_CURRENT_IN_E2
247	mov init_task,e2
248	#endif
249
250	# initialise the processor and the unit
251	call processor_init[],0
252	call unit_init[],0
253
368dd5ac AT	254	#ifdef CONFIG_SMP
	255	# mark the primary CPU in cpu_boot_map
	256	mov cpu_boot_map,a0
	257	mov 0x1,d0
	258	mov d0,(a0)
	259
	260	# signal each secondary CPU to begin booting
	261	mov 0x1,d2 # CPU ID
	262
	263	loop_request_boot_secondary:
	264	mov d2,a0
	265	# send SMP_BOOT_IPI to secondary CPU
	266	asl CROSS_ICR_CPU_SHIFT,a0
	267	add CROSS_GxICR(SMP_BOOT_IRQ,0),a0
	268	movhu (a0),d0
	269	or GxICR_REQUEST\|GxICR_DETECT,d0
	270	movhu d0,(a0)
	271	movhu (a0),d0 # flush
	272
	273	# wait up to 100ms for AP's IPI to be received
	274	clr d3
	275	wait_on_secondary_boot:
	276	mov DELAY_TIME_BOOT_IPI,d0
	277	call __delay[],0
	278	inc d3
	279	mov cpu_boot_map,a0
	280	mov (a0),d0
	281	lsr d2,d0
	282	btst 0x1,d0
	283	bne 1f
	284	cmp TIME_OUT_COUNT_BOOT_IPI,d3
	285	bne wait_on_secondary_boot
	286	1:
	287	inc d2
	288	cmp NR_CPUS,d2
	289	bne loop_request_boot_secondary
	290	#endif /* CONFIG_SMP */
	291
b920de1b DH	292	#ifdef CONFIG_GDBSTUB
	293	call gdbstub_init[],0
	294
	295	#ifdef CONFIG_GDBSTUB_IMMEDIATE
	296	.globl __gdbstub_pause
	297	__gdbstub_pause:
	298	bra __gdbstub_pause
	299	#endif
	300	#endif
	301
	302	jmp start_kernel
368dd5ac AT	303	.size _start,.-_start
	304
	305	###############################################################################
	306	#
	307	# Secondary CPU boot point
	308	#
	309	###############################################################################
	310	#ifdef CONFIG_SMP
	311	startup_secondary:
	312	# preload the PGD pointer register
	313	mov swapper_pg_dir,d0
	314	mov d0,(PTBR)
	315	clr d0
	316	movbu d0,(PIDR)
	317
	318	# turn on the TLBs
	319	mov MMUCTR_IIV\|MMUCTR_DIV,d0
	320	mov d0,(MMUCTR)
	321	#ifdef CONFIG_AM34_2
	322	mov MMUCTR_ITE\|MMUCTR_DTE\|MMUCTR_CE\|MMUCTR_WTE,d0
	323	#else
	324	mov MMUCTR_ITE\|MMUCTR_DTE\|MMUCTR_CE,d0
	325	#endif
	326	mov d0,(MMUCTR)
	327
	328	# turn on AM33v2 exception handling mode and set the trap table base
	329	movhu (CPUP),d0
	330	or CPUP_EXM_AM33V2,d0
	331	movhu d0,(CPUP)
	332
	333	# set the interrupt vector table
	334	mov CONFIG_INTERRUPT_VECTOR_BASE,d0
	335	mov d0,(TBR)
	336
	337	# invalidate and enable both of the caches
	338	mov ECHCTR,a0
	339	clr d0
	340	mov d0,(a0)
	341	mov CHCTR,a0
	342	clr d0
	343	movhu d0,(a0) # turn off first
	344	mov CHCTR_ICINV\|CHCTR_DCINV,d0
	345	movhu d0,(a0)
	346	setlb
	347	mov (a0),d0
	348	btst CHCTR_ICBUSY\|CHCTR_DCBUSY,d0 # wait till not busy (use CPU loop buffer)
	349	lne
	350
	351	#ifdef CONFIG_MN10300_CACHE_ENABLED
	352	#ifdef CONFIG_MN10300_CACHE_WBACK
	353	#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
	354	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRBACK,d0
	355	#else
	356	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRBACK\|CHCTR_DCALMD,d0
	357	#endif /* !NOWRALLOC */
	358	#else
	359	mov CHCTR_ICEN\|CHCTR_DCEN\|CHCTR_DCWTMD_WRTHROUGH,d0
	360	#endif /* WBACK */
	361	movhu d0,(a0) # enable
	362	#endif /* ENABLED */
	363
	364	# Clear the boot IPI interrupt for this CPU
	365	movhu (GxICR(SMP_BOOT_IRQ)),d0
	366	and ~GxICR_REQUEST,d0
367	movhu d0,(GxICR(SMP_BOOT_IRQ))
368	movhu (GxICR(SMP_BOOT_IRQ)),d0 # flush
369
370	/* get stack */
371	mov CONFIG_INTERRUPT_VECTOR_BASE + CONFIG_BOOT_STACK_OFFSET,a0
372	mov (CPUID),d0
373	and CPUID_MASK,d0
374	mulu CONFIG_BOOT_STACK_SIZE,d0
375	sub d0,a0
376	mov a0,sp
377
378	# init interrupt for AP
379	call smp_prepare_cpu_init[],0
380
381	# mark this secondary CPU in cpu_boot_map
382	mov (CPUID),d0
383	mov 0x1,d1
384	asl d0,d1
385	mov cpu_boot_map,a0
386	bset d1,(a0)
387
388	or EPSW_IE\|EPSW_IM_1,epsw # permit level 0 interrupts
389	nop
390	nop
391	#ifdef CONFIG_MN10300_CACHE_WBACK
392	# flush the local cache if it's in writeback mode
393	call mn10300_local_dcache_flush_inv[],0
394	setlb
395	mov (CHCTR),d0
396	btst CHCTR_DCBUSY,d0 # wait till not busy (use CPU loop buffer)
397	lne
398	#endif
399
400	# now sleep waiting for further instructions
401	secondary_sleep:
402	mov CPUM_SLEEP,d0
403	movhu d0,(CPUM)
404	nop
405	nop
406	bra secondary_sleep
407	.size startup_secondary,.-startup_secondary
408	#endif /* CONFIG_SMP */
409
410	###############################################################################
411	#
412	#
413	#
414	###############################################################################
b920de1b DH	415	ENTRY(__head_end)
	416
	417	/*
	418	* This is initialized to disallow all access to the low 2G region
	419	* - the high 2G region is managed directly by the MMU
	420	* - range 0x70000000-0x7C000000 are initialised for use by VMALLOC
	421	*/
	422	.section .bss
	423	.balign PAGE_SIZE
	424	ENTRY(swapper_pg_dir)
	425	.space PTRS_PER_PGD*4
	426
	427	/*
	428	* The page tables are initialized to only 8MB here - the final page
	429	* tables are set up later depending on memory size.
	430	*/
	431
	432	.balign PAGE_SIZE
	433	ENTRY(empty_zero_page)
	434	.space PAGE_SIZE
	435
	436	.balign PAGE_SIZE
	437	ENTRY(empty_bad_page)
	438	.space PAGE_SIZE
	439
	440	.balign PAGE_SIZE
	441	ENTRY(empty_bad_pte_table)
	442	.space PAGE_SIZE
	443
	444	.balign PAGE_SIZE
	445	ENTRY(large_page_table)
	446	.space PAGE_SIZE
	447
	448	.balign PAGE_SIZE
	449	ENTRY(kernel_vmalloc_ptes)
	450	.space ((VMALLOC_END-VMALLOC_START)/PAGE_SIZE)*4