X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Fm68k%2Fcpu%2Fmcf52x2%2Fstart.S;h=ab199b1e5befd08a247861e3766df9ffd780b819;hb=423620b9d47a704124f9fd624b4de4ed56c600d6;hp=ee17792cb391ca3a485a8e27834b180fb81965d7;hpb=1902692aa0b2dcbb9351172be03c57d1e82447e4;p=u-boot diff --git a/arch/m68k/cpu/mcf52x2/start.S b/arch/m68k/cpu/mcf52x2/start.S index ee17792cb3..ab199b1e5b 100644 --- a/arch/m68k/cpu/mcf52x2/start.S +++ b/arch/m68k/cpu/mcf52x2/start.S @@ -2,23 +2,7 @@ * Copyright (C) 2003 Josef Baumgartner * Based on code from Bernhard Kuhn * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA + * SPDX-License-Identifier: GPL-2.0+ */ #include @@ -26,10 +10,6 @@ #include "version.h" #include -#ifndef CONFIG_IDENT_STRING -#define CONFIG_IDENT_STRING "" -#endif - #define _START _start #define _FAULT _fault @@ -50,12 +30,12 @@ #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. + * Vector table. This is used for initial platform startup. + * These vectors are to catch any un-intended traps. */ _vectors: - .long 0x00000000 /* Flash offset is 0 until we setup CS0 */ #if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) .long _start - CONFIG_SYS_TEXT_BASE @@ -101,24 +81,24 @@ _vectors: #endif - .text - +.text #if defined(CONFIG_SYS_INT_FLASH_BASE) && \ (defined(CONFIG_M5282) || defined(CONFIG_M5281)) - #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) - .long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ - .long 0xFFFFFFFF /* all sectors protected */ - .long 0x00000000 /* supervisor/User restriction */ - .long 0x00000000 /* programm/data space restriction */ - .long 0x00000000 /* Flash security */ - #endif +#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) +.long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ +.long 0xFFFFFFFF /* all sectors protected */ +.long 0x00000000 /* supervisor/User restriction */ +.long 0x00000000 /* programm/data space restriction */ +.long 0x00000000 /* Flash security */ #endif - .globl _start +#endif + +.globl _start _start: nop nop - move.w #0x2700,%sr + move.w #0x2700,%sr #if defined(CONFIG_M5208) /* Initialize RAMBAR: locate SRAM and validate it */ @@ -127,22 +107,24 @@ _start: #endif #if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253) - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set MBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.c %d0, %MBAR /*** The 5249 has MBAR2 as well ***/ #ifdef CONFIG_SYS_MBAR2 - move.l #(CONFIG_SYS_MBAR2 + 1), %d0 /* Get MBAR2 address */ - movec %d0, #0xc0e /* Set MBAR2 */ + /* Get MBAR2 address */ + move.l #(CONFIG_SYS_MBAR2 + 1), %d0 + /* Set MBAR2 */ + movec %d0, #0xc0e #endif - move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 movec %d0, %RAMBAR0 #endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */ #if defined(CONFIG_M5282) || defined(CONFIG_M5271) - /* Initialize IPSBAR */ - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.l %d0, 0x40000000 /* Initialize RAMBAR1: locate SRAM and validate it */ @@ -151,22 +133,24 @@ _start: #if defined(CONFIG_M5282) #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) - /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */ - - move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 - move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 - move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 + /* + * Setup code in SRAM to initialize FLASHBAR, + * if start from internal Flash + */ + move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 + move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 + move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 _copy_flash: - move.l (%a0)+, (%a2)+ - cmp.l %a0, %a1 - bgt.s _copy_flash - jmp CONFIG_SYS_INIT_RAM_ADDR + move.l (%a0)+, (%a2)+ + cmp.l %a0, %a1 + bgt.s _copy_flash + jmp CONFIG_SYS_INIT_RAM_ADDR _flashbar_setup: /* Initialize FLASHBAR: locate internal Flash and validate it */ move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 movec %d0, %FLASHBAR - jmp _after_flashbar_copy.L /* Force jump to absolute address */ + jmp _after_flashbar_copy.L /* Force jump to absolute address */ _flashbar_setup_end: nop _after_flashbar_copy: @@ -178,7 +162,8 @@ _after_flashbar_copy: #endif #endif - /* if we come from a pre-loader we have no exception table and + /* + * 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) @@ -191,8 +176,8 @@ _after_flashbar_copy: #endif #ifdef CONFIG_M5275 - /* Initialize IPSBAR */ - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.l %d0, 0x40000000 /* movec %d0, %MBAR */ @@ -202,24 +187,47 @@ _after_flashbar_copy: #endif /* initialize general use internal ram */ - move.l #0, %d0 - move.l #(ICACHE_STATUS), %a1 /* icache */ - move.l #(DCACHE_STATUS), %a2 /* icache */ - move.l %d0, (%a1) - move.l %d0, (%a2) + move.l #0, %d0 + move.l #(ICACHE_STATUS), %a1 /* icache */ + move.l #(DCACHE_STATUS), %a2 /* icache */ + move.l %d0, (%a1) + move.l %d0, (%a2) + + /* put relocation table address to a5 */ + move.l #__got_start, %a5 + + /* setup stack initially on top of internal static ram */ + move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp + + /* + * if configured, malloc_f arena will be reserved first, + * then (and always) gd struct space will be reserved + */ + move.l %sp, -(%sp) + move.l #board_init_f_alloc_reserve, %a1 + jsr (%a1) - /* set stackpointer to end of internal ram to get some stackspace for the first c-code */ - move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp - clr.l %sp@- + /* update stack and frame-pointers */ + move.l %d0, %sp + move.l %sp, %fp - move.l #__got_start, %a5 /* put relocation table address to a5 */ + /* initialize reserved area */ + move.l %d0, -(%sp) + move.l #board_init_f_init_reserve, %a1 + jsr (%a1) - bsr cpu_init_f /* run low-level CPU init code (from flash) */ - bsr board_init_f /* run low-level board init code (from flash) */ + /* run low-level CPU init code (from flash) */ + move.l #cpu_init_f, %a1 + jsr (%a1) + + /* run low-level board init code (from flash) */ + clr.l %sp@- + move.l #board_init_f, %a1 + jsr (%a1) /* board_init_f() does not return */ -/*------------------------------------------------------------------------------*/ +/******************************************************************************/ /* * void relocate_code (addr_sp, gd, addr_moni) @@ -232,22 +240,22 @@ _after_flashbar_copy: * r5 = length in bytes * r6 = cachelinesize */ - .globl relocate_code +.globl relocate_code relocate_code: - link.w %a6,#0 - move.l 8(%a6), %sp /* set new stack pointer */ + 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 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 + 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 + move.l (%a1)+, (%a3)+ + cmp.l %a1,%a2 + bgt.s 1b /* * We are done. Do not return, instead branch to second part of board @@ -277,7 +285,7 @@ clear_bss: */ move.l %a0, %a1 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 - move.l %a1,%a5 /* * fix got pointer register a5 */ + move.l %a1,%a5 /* fix got pointer register a5 */ move.l %a0, %a2 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 @@ -291,43 +299,44 @@ clear_bss: 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 + 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 */ + 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 +.globl _fault _fault: - jmp _fault + bra _fault - .globl _exc_handler +.globl _exc_handler _exc_handler: SAVE_ALL movel %sp,%sp@- - bsr exc_handler + bsr exc_handler addql #4,%sp RESTORE_ALL - .globl _int_handler +.globl _int_handler _int_handler: SAVE_ALL movel %sp,%sp@- - bsr int_handler + bsr int_handler addql #4,%sp RESTORE_ALL -/*------------------------------------------------------------------------------*/ +/******************************************************************************/ - .globl version_string +.globl version_string version_string: - .ascii U_BOOT_VERSION_STRING, "\0" - .align 4 +.ascii U_BOOT_VERSION_STRING, "\0" +.align 4