mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 13:56:30 +00:00
258 lines
6.7 KiB
ArmAsm
258 lines
6.7 KiB
ArmAsm
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/*
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* (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
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* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include "version.h"
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#include <asm/cache.h>
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#ifndef CONFIG_IDENT_STRING
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#define CONFIG_IDENT_STRING ""
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#endif
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#define _START _start
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#define _FAULT _fault
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.macro SAVE_ALL
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move.w #0x2700,%sr; /* disable intrs */
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subl #60,%sp; /* space for 15 regs */
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moveml %d0-%d7/%a0-%a6,%sp@
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.endm
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.macro RESTORE_ALL
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moveml %sp@,%d0-%d7/%a0-%a6;
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addl #60,%sp; /* space for 15 regs */
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rte
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.endm
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/* If we come from a pre-loader we don't need an initial exception
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* table.
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*/
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#if !defined(CONFIG_MONITOR_IS_IN_RAM)
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.text
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/*
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* Vector table. This is used for initial platform startup.
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* These vectors are to catch any un-intended traps.
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*/
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_vectors:
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/* Flash offset is 0 until we setup CS0 */
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.long 0x00000000
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#if defined(CONFIG_M5307) && \
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(CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
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.long _start - CONFIG_SYS_TEXT_BASE
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#else
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.long _START
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#endif
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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#endif
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.text
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.globl _start
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_start:
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nop
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nop
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move.w #0x2700,%sr
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/* set MBAR address + valid flag */
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move.l #(CONFIG_SYS_MBAR + 1), %d0
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move.c %d0, %MBAR
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move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
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move.c %d0, %RAMBAR
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/* DS 4.8.2 (Cache Organization) invalidate and disable cache */
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move.l #CF_CACR_CINVA, %d0
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movec %d0, %CACR
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move.l #0, %d0
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movec %d0, %ACR0
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movec %d0, %ACR1
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/*
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* if we come from a pre-loader we have no exception table and
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* therefore no VBR to set
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*/
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#if !defined(CONFIG_MONITOR_IS_IN_RAM)
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move.l #CONFIG_SYS_FLASH_BASE, %d0
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movec %d0, %VBR
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#endif
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/* initialize general use internal ram */
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move.l #0, %d0
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move.l #(ICACHE_STATUS), %a1 /* icache */
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move.l #(DCACHE_STATUS), %a2 /* dcache */
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move.l %d0, (%a1)
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move.l %d0, (%a2)
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/*
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* set stackpointer to internal sram end - 80
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* (global data struct size + some bytes)
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* get some stackspace for the first c-code,
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*/
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move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
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clr.l %sp@-
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/* put relocation table address to a5 */
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move.l #__got_start, %a5
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/* run low-level CPU init code (from flash) */
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bsr cpu_init_f
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/* run low-level board init code (from flash) */
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bsr board_init_f
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/* board_init_f() does not return */
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/*--------------------------------------------------------------------------*/
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/*
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* void relocate_code (addr_sp, gd, addr_moni)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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*/
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.globl relocate_code
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relocate_code:
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link.w %a6,#0
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move.l 8(%a6), %sp /* set new stack pointer */
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move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
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move.l 16(%a6), %a0 /* Save copy of Destination Address */
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move.l #CONFIG_SYS_MONITOR_BASE, %a1
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move.l #__init_end, %a2
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move.l %a0, %a3
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/* copy the code to RAM */
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1:
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move.l (%a1)+, (%a3)+
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cmp.l %a1,%a2
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bgt.s 1b
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/*
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* We are done. Do not return, instead branch to second part of board
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* initialization, now running from RAM.
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*/
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move.l %a0, %a1
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add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
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jmp (%a1)
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in_ram:
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clear_bss:
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/*
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* Now clear BSS segment
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*/
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move.l %a0, %a1
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add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
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move.l %a0, %d1
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add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
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6:
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clr.l (%a1)+
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cmp.l %a1,%d1
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bgt.s 6b
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/*
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* fix got table in RAM
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*/
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move.l %a0, %a1
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add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
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/* * fix got pointer register a5 */
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move.l %a1,%a5
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move.l %a0, %a2
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add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
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7:
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move.l (%a1),%d1
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sub.l #_start, %d1
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add.l %a0,%d1
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move.l %d1,(%a1)+
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cmp.l %a2, %a1
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bne 7b
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/* calculate relative jump to board_init_r in ram */
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move.l %a0, %a1
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add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
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/* set parameters for board_init_r */
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move.l %a0,-(%sp) /* dest_addr */
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move.l %d0,-(%sp) /* gd */
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#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
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defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
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halt
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#endif
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jsr (%a1)
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/*--------------------------------------------------------------------------*/
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/* exception code */
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.globl _fault
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_fault:
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bra _fault
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.globl _exc_handler
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_exc_handler:
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SAVE_ALL
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movel %sp,%sp@-
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bsr exc_handler
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addql #4,%sp
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RESTORE_ALL
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.globl _int_handler
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_int_handler:
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SAVE_ALL
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movel %sp,%sp@-
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bsr int_handler
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addql #4,%sp
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RESTORE_ALL
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/*--------------------------------------------------------------------------*/
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.globl version_string
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version_string:
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.ascii U_BOOT_VERSION
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.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
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.ascii CONFIG_IDENT_STRING, "\0"
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.align 4
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