1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* linux/arch/h8300/platform/h8300h/generic/crt0_rom.S
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* Platform depend startup
* Target Archtecture: generic
* Memory Layout : ROM
*/
#define ASSEMBLY
#include <linux/config.h>
#include <asm/linkage.h>
.global SYMBOL_NAME(_start)
.global SYMBOL_NAME(_command_line)
.global SYMBOL_NAME(_platform_gpio_table)
.global SYMBOL_NAME(_target_name)
.h8300h
.section .text
.file "crt0_rom.S"
/* CPU Reset entry */
SYMBOL_NAME_LABEL(_start)
mov.l #__ramend,sp
ldc #0x80,ccr
/* Peripheral Setup */
/* .bss clear */
mov.l #__sbss,er5
mov.l #__ebss,er4
sub.l er5,er4
shlr er4
shlr er4
sub.l er0,er0
1:
mov.l er0,@er5
adds #4,er5
dec.l #1,er4
bne 1b
/* copy .data */
#if !defined(CONFIG_H8300H_SIM)
/* copy .data */
mov.l #__begin_data,er5
mov.l #__sdata,er6
mov.l #__edata,er4
sub.l er6,er4
shlr.l er4
shlr.l er4
1:
mov.l @er5+,er0
mov.l er0,@er6
adds #4,er6
dec.l #1,er4
bne 1b
#endif
/* copy kernel commandline */
mov.l #COMMAND_START,er5
mov.l #SYMBOL_NAME(_command_line),er6
mov.w #512,r4
eepmov.w
/* linux kernel start */
ldc #0x90,ccr /* running kernel */
mov.l #SYMBOL_NAME(init_thread_union),sp
add.l #0x2000,sp
jsr @_start_kernel
_exit:
jmp _exit
rts
/* I/O port assign information */
__platform_gpio_table:
mov.l #gpio_table,er0
rts
gpio_table:
;; P1DDR
.byte 0x00,0x00
;; P2DDR
.byte 0x00,0x00
;; P3DDR
.byte 0x00,0x00
;; P4DDR
.byte 0x00,0x00
;; P5DDR
.byte 0x00,0x00
;; P6DDR
.byte 0x00,0x00
;; dummy
.byte 0x00,0x00
;; P8DDR
.byte 0x00,0x00
;; P9DDR
.byte 0x00,0x00
;; PADDR
.byte 0x00,0x00
;; PBDDR
.byte 0x00,0x00
.section .rodata
__target_name:
.asciz "generic"
.section .bss
__command_line:
.space 512
/* interrupt vector */
.section .vectors,"ax"
.long __start
vector = 1
.rept 64-1
.long _interrupt_redirect_table+vector*4
vector = vector + 1
.endr
|
