258 lines
6.7 KiB
ArmAsm
258 lines
6.7 KiB
ArmAsm
/*
|
|
* (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
|
|
* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include "version.h"
|
|
#include <asm/cache.h>
|
|
|
|
#ifndef CONFIG_IDENT_STRING
|
|
#define CONFIG_IDENT_STRING ""
|
|
#endif
|
|
|
|
#define _START _start
|
|
#define _FAULT _fault
|
|
|
|
|
|
.macro SAVE_ALL
|
|
move.w #0x2700,%sr; /* disable intrs */
|
|
subl #60,%sp; /* space for 15 regs */
|
|
moveml %d0-%d7/%a0-%a6,%sp@
|
|
.endm
|
|
|
|
.macro RESTORE_ALL
|
|
moveml %sp@,%d0-%d7/%a0-%a6;
|
|
addl #60,%sp; /* space for 15 regs */
|
|
rte
|
|
.endm
|
|
|
|
/* If we come from a pre-loader we don't need an initial exception
|
|
* table.
|
|
*/
|
|
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
|
|
|
|
.text
|
|
/*
|
|
* Vector table. This is used for initial platform startup.
|
|
* These vectors are to catch any un-intended traps.
|
|
*/
|
|
_vectors:
|
|
|
|
/* Flash offset is 0 until we setup CS0 */
|
|
.long 0x00000000
|
|
#if defined(CONFIG_M5307) && \
|
|
(CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
|
|
.long _start - CONFIG_SYS_TEXT_BASE
|
|
#else
|
|
.long _START
|
|
#endif
|
|
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
|
|
|
|
#endif
|
|
|
|
.text
|
|
.globl _start
|
|
_start:
|
|
nop
|
|
nop
|
|
move.w #0x2700,%sr
|
|
|
|
/* set MBAR address + valid flag */
|
|
move.l #(CONFIG_SYS_MBAR + 1), %d0
|
|
move.c %d0, %MBAR
|
|
|
|
move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
|
|
move.c %d0, %RAMBAR
|
|
|
|
/* DS 4.8.2 (Cache Organization) invalidate and disable cache */
|
|
move.l #CF_CACR_CINVA, %d0
|
|
movec %d0, %CACR
|
|
move.l #0, %d0
|
|
movec %d0, %ACR0
|
|
movec %d0, %ACR1
|
|
|
|
/*
|
|
* if we come from a pre-loader we have no exception table and
|
|
* therefore no VBR to set
|
|
*/
|
|
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
|
|
move.l #CONFIG_SYS_FLASH_BASE, %d0
|
|
movec %d0, %VBR
|
|
#endif
|
|
|
|
/* initialize general use internal ram */
|
|
move.l #0, %d0
|
|
move.l #(ICACHE_STATUS), %a1 /* icache */
|
|
move.l #(DCACHE_STATUS), %a2 /* dcache */
|
|
move.l %d0, (%a1)
|
|
move.l %d0, (%a2)
|
|
|
|
/*
|
|
* set stackpointer to internal sram end - 80
|
|
* (global data struct size + some bytes)
|
|
* get some stackspace for the first c-code,
|
|
*/
|
|
move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
|
|
clr.l %sp@-
|
|
|
|
/* put relocation table address to a5 */
|
|
move.l #__got_start, %a5
|
|
|
|
/* run low-level CPU init code (from flash) */
|
|
bsr cpu_init_f
|
|
|
|
/* run low-level board init code (from flash) */
|
|
bsr board_init_f
|
|
|
|
/* board_init_f() does not return */
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* void relocate_code (addr_sp, gd, addr_moni)
|
|
*
|
|
* This "function" does not return, instead it continues in RAM
|
|
* after relocating the monitor code.
|
|
*
|
|
*/
|
|
.globl relocate_code
|
|
relocate_code:
|
|
link.w %a6,#0
|
|
move.l 8(%a6), %sp /* set new stack pointer */
|
|
move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
|
|
move.l 16(%a6), %a0 /* Save copy of Destination Address */
|
|
|
|
move.l #CONFIG_SYS_MONITOR_BASE, %a1
|
|
move.l #__init_end, %a2
|
|
move.l %a0, %a3
|
|
/* copy the code to RAM */
|
|
1:
|
|
move.l (%a1)+, (%a3)+
|
|
cmp.l %a1,%a2
|
|
bgt.s 1b
|
|
|
|
/*
|
|
* We are done. Do not return, instead branch to second part of board
|
|
* initialization, now running from RAM.
|
|
*/
|
|
move.l %a0, %a1
|
|
add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
|
|
jmp (%a1)
|
|
|
|
in_ram:
|
|
|
|
clear_bss:
|
|
/*
|
|
* Now clear BSS segment
|
|
*/
|
|
move.l %a0, %a1
|
|
add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
|
|
move.l %a0, %d1
|
|
add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
|
|
6:
|
|
clr.l (%a1)+
|
|
cmp.l %a1,%d1
|
|
bgt.s 6b
|
|
|
|
/*
|
|
* fix got table in RAM
|
|
*/
|
|
move.l %a0, %a1
|
|
add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
|
|
/* * fix got pointer register a5 */
|
|
move.l %a1,%a5
|
|
|
|
move.l %a0, %a2
|
|
add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
|
|
|
|
7:
|
|
move.l (%a1),%d1
|
|
sub.l #_start, %d1
|
|
add.l %a0,%d1
|
|
move.l %d1,(%a1)+
|
|
cmp.l %a2, %a1
|
|
bne 7b
|
|
|
|
/* calculate relative jump to board_init_r in ram */
|
|
move.l %a0, %a1
|
|
add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
|
|
|
|
/* set parameters for board_init_r */
|
|
move.l %a0,-(%sp) /* dest_addr */
|
|
move.l %d0,-(%sp) /* gd */
|
|
#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
|
|
defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
|
|
halt
|
|
#endif
|
|
jsr (%a1)
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
/* exception code */
|
|
.globl _fault
|
|
_fault:
|
|
bra _fault
|
|
|
|
.globl _exc_handler
|
|
_exc_handler:
|
|
SAVE_ALL
|
|
movel %sp,%sp@-
|
|
bsr exc_handler
|
|
addql #4,%sp
|
|
RESTORE_ALL
|
|
|
|
.globl _int_handler
|
|
_int_handler:
|
|
SAVE_ALL
|
|
movel %sp,%sp@-
|
|
bsr int_handler
|
|
addql #4,%sp
|
|
RESTORE_ALL
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
.globl version_string
|
|
version_string:
|
|
.ascii U_BOOT_VERSION
|
|
.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
|
|
.ascii CONFIG_IDENT_STRING, "\0"
|
|
.align 4
|