1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * (C) Copyright 2015  Angelo Dureghello <angelo@sysam.it>
4 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
5 */
6
7#include <asm-offsets.h>
8#include <config.h>
9#include <asm/cache.h>
10
11#define _START	_start
12#define _FAULT	_fault
13
14
15.macro  SAVE_ALL
16	move.w	#0x2700,%sr;		/* disable intrs */
17	subl	#60,%sp;		/* space for 15 regs */
18	moveml	%d0-%d7/%a0-%a6,%sp@
19.endm
20
21.macro  RESTORE_ALL
22	moveml	%sp@,%d0-%d7/%a0-%a6;
23	addl	#60,%sp;		/* space for 15 regs */
24	rte
25.endm
26
27/* If we come from a pre-loader we don't need an initial exception
28 * table.
29 */
30#if !defined(CONFIG_MONITOR_IS_IN_RAM)
31
32.text
33
34/*
35 * Vector table. This is used for initial platform startup.
36 * These vectors are to catch any un-intended traps.
37 */
38_vectors:
39/* Flash offset is 0 until we setup CS0 */
40.long	0x00000000
41#if defined(CONFIG_M5307) && \
42	   (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
43.long	_start - CONFIG_SYS_TEXT_BASE
44#else
45.long	_START
46#endif
47
48.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
49.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
50.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
51.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
52.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
53.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
54.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
55.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
56
57.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
58.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
59.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
60.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
61.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
62.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
63.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
64.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
65
66.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
67.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
68.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
69.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
70.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
71.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
72.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
73.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
74
75.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
76.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
77.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
78.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
79.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
80.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
81.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
82.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
83
84#endif
85
86.text
87
88.globl _start
89_start:
90	nop
91	nop
92	move.w	#0x2700,%sr
93
94	/* set MBAR address + valid flag */
95	move.l	#(CONFIG_SYS_MBAR + 1), %d0
96	move.c	%d0, %MBAR
97
98	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
99	move.c	%d0, %RAMBAR
100
101	/* DS 4.8.2 (Cache Organization) invalidate and disable cache */
102        move.l	#CF_CACR_CINVA, %d0
103        movec	%d0, %CACR
104        move.l	#0, %d0
105        movec	%d0, %ACR0
106        movec	%d0, %ACR1
107
108	/*
109	 * if we come from a pre-loader we have no exception table and
110	 * therefore no VBR to set
111	 */
112#if !defined(CONFIG_MONITOR_IS_IN_RAM)
113	move.l	#CONFIG_SYS_FLASH_BASE, %d0
114	movec	%d0, %VBR
115#endif
116
117	/* initialize general use internal ram */
118	move.l	#0, %d0
119	move.l	#(ICACHE_STATUS), %a1	/* icache */
120	move.l	#(DCACHE_STATUS), %a2	/* dcache */
121	move.l	%d0, (%a1)
122	move.l	%d0, (%a2)
123
124	/* put relocation table address to a5 */
125	move.l	#__got_start, %a5
126
127	/* setup stack initially on top of internal static ram  */
128	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
129
130	/*
131	 * if configured, malloc_f arena will be reserved first,
132	 * then (and always) gd struct space will be reserved
133	 */
134	move.l	%sp, -(%sp)
135	bsr	board_init_f_alloc_reserve
136
137	/* update stack and frame-pointers */
138	move.l	%d0, %sp
139	move.l	%sp, %fp
140
141	/* initialize reserved area */
142	move.l	%d0, -(%sp)
143	bsr	board_init_f_init_reserve
144
145	/* run low-level CPU init code (from flash) */
146	bsr	cpu_init_f
147
148	/* run low-level board init code (from flash) */
149	clr.l	%sp@-
150	bsr	board_init_f
151
152	/* board_init_f() does not return */
153
154/******************************************************************************/
155
156/*
157 * void relocate_code(addr_sp, gd, addr_moni)
158 *
159 * This "function" does not return, instead it continues in RAM
160 * after relocating the monitor code.
161 *
162 */
163.globl relocate_code
164relocate_code:
165	link.w	%a6,#0
166	move.l	8(%a6), %sp	/* set new stack pointer */
167	move.l	12(%a6), %d0	/* Save copy of Global Data pointer */
168	move.l	16(%a6), %a0	/* Save copy of Destination Address */
169
170	move.l	#CONFIG_SYS_MONITOR_BASE, %a1
171	move.l	#__init_end, %a2
172	move.l	%a0, %a3
173	/* copy the code to RAM */
1741:
175	move.l	(%a1)+, (%a3)+
176	cmp.l	%a1,%a2
177	bgt.s	1b
178
179/*
180 * We are done. Do not return, instead branch to second part of board
181 * initialization, now running from RAM.
182 */
183	move.l	%a0, %a1
184	add.l	#(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
185	jmp	(%a1)
186
187in_ram:
188
189clear_bss:
190	/*
191	 * Now clear BSS segment
192	 */
193	move.l	%a0, %a1
194	add.l	#(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
195	move.l	%a0, %d1
196	add.l	#(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
1976:
198	clr.l	(%a1)+
199	cmp.l	%a1,%d1
200	bgt.s	6b
201
202	/*
203	 * fix got table in RAM
204	 */
205	move.l	%a0, %a1
206	add.l	#(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
207
208	/* fix got pointer register a5 */
209	move.l	%a1,%a5
210
211	move.l	%a0, %a2
212	add.l	#(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
213
2147:
215	move.l	(%a1),%d1
216	sub.l	#_start, %d1
217	add.l	%a0,%d1
218	move.l	%d1,(%a1)+
219	cmp.l	%a2, %a1
220	bne	7b
221
222	/* calculate relative jump to board_init_r in ram */
223	move.l	%a0, %a1
224	add.l	#(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
225
226	/* set parameters for board_init_r */
227	move.l	%a0,-(%sp)	/* dest_addr */
228	move.l	%d0,-(%sp)	/* gd */
229#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
230    defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
231	halt
232#endif
233	jsr	(%a1)
234
235/******************************************************************************/
236
237/* exception code */
238.globl _fault
239_fault:
240	bra	_fault
241
242.globl _exc_handler
243_exc_handler:
244	SAVE_ALL
245	movel	%sp,%sp@-
246	bsr	exc_handler
247	addql	#4,%sp
248	RESTORE_ALL
249
250.globl _int_handler
251_int_handler:
252	SAVE_ALL
253	movel	%sp,%sp@-
254	bsr	int_handler
255	addql	#4,%sp
256	RESTORE_ALL
257
258/******************************************************************************/
259
260.align	4
261