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1/*
2 *  linux/arch/h8300/platform/h8s/generic/crt0_rom.S
3 *
4 *  Yoshinori Sato <ysato@users.sourceforge.jp>
5 *
6 *  Platform depend startup
7 *  Target Archtecture:	generic
8 *  Memory Layout     :	ROM
9 */
10
11#define ASSEMBLY
12
13#include <asm/linkage.h>
14#include <asm/regs267x.h>
15
16	.global SYMBOL_NAME(_start)
17	.global SYMBOL_NAME(_command_line)
18	.global SYMBOL_NAME(_platform_gpio_table)
19	.global SYMBOL_NAME(_target_name)
20
21	.h8300s
22	.section .text
23	.file	"crt0_rom.S"
24
25	/* CPU Reset entry */
26SYMBOL_NAME_LABEL(_start)
27	mov.l	#__ramend,sp
28	ldc	#0x80,ccr
29	ldc	#0,exr
30	bclr	#4,@INTCR:8
31	bset	#5,@INTCR:8	/* Interrupt mode 2 */
32
33	/* Peripheral Setup */
34
35	/* copy .data */
36#if !defined(CONFIG_H8S_SIM)
37	mov.l	#__begin_data,er5
38	mov.l	#__sdata,er6
39	mov.l	#__edata,er4
40	sub.l	er6,er4
41	shlr.l	#2,er4
421:
43	mov.l	@er5+,er0
44	mov.l	er0,@er6
45	adds	#4,er6
46	dec.l	#1,er4
47	bne	1b
48#endif
49
50	/* .bss clear */
51	mov.l	#__sbss,er5
52	mov.l	#__ebss,er4
53	sub.l	er5,er4
54	shlr.l	#2,er4
55	sub.l	er0,er0
561:
57	mov.l	er0,@er5
58	adds	#4,er5
59	dec.l	#1,er4
60	bne	1b
61
62	/* linux kernel start */
63	ldc	#0x90,ccr	/* running kernel */
64	mov.l	#SYMBOL_NAME(init_thread_union),sp
65	add.l	#0x2000,sp
66	jsr	@_start_kernel
67_exit:
68
69	jmp	_exit
70
71	rts
72
73	/* I/O port assign information */
74__platform_gpio_table:
75	mov.l	#gpio_table,er0
76	rts
77
78gpio_table:
79	;; P1DDR
80	.byte	0x00,0x00
81	;; P2DDR
82	.byte	0x00,0x00
83	;; P3DDR
84	.byte	0x00,0x00
85	;; P4DDR
86	.byte	0x00,0x00
87	;; P5DDR
88	.byte	0x00,0x00
89	;; P6DDR
90	.byte	0x00,0x00
91	;; dummy
92	.byte	0x00,0x00
93	;; P8DDR
94	.byte	0x00,0x00
95	;; PADDR
96	.byte	0x00,0x00
97	;; PBDDR
98	.byte	0x00,0x00
99	;; PCDDR
100	.byte	0x00,0x00
101	;; PDDDR
102	.byte	0x00,0x00
103	;; PEDDR
104	.byte	0x00,0x00
105	;; PFDDR
106	.byte	0x00,0x00
107	;; PGDDR
108	.byte	0x00,0x00
109	;; PHDDR
110	.byte	0x00,0x00
111
112	.section .rodata
113__target_name:
114	.asciz	"generic"
115
116	.section .bss
117__command_line:
118	.space	512
119
120	/* interrupt vector */
121	.section .vectors,"ax"
122	.long	__start
123	.long	__start
124vector	=	2
125	.rept	126-1
126	.long	_interrupt_redirect_table+vector*4
127vector	=	vector + 1
128	.endr
129