/* * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> * * 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 */ #include <config.h> #include "version.h" #ifndef CONFIG_IDENT_STRING #define CONFIG_IDENT_STRING "" #endif /* last three long word reserved for cache status */ #define ICACHE_STATUS (CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END- 4) #define DCACHE_STATUS (CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END- 8) #define CACR_STATUS (CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END-12) #define _START _start #define _FAULT _fault #define SAVE_ALL \ move.w #0x2700,%sr; /* disable intrs */ \ subl #60,%sp; /* space for 15 regs */ \ moveml %d0-%d7/%a0-%a6,%sp@; #define RESTORE_ALL \ moveml %sp@,%d0-%d7/%a0-%a6; \ addl #60,%sp; /* space for 15 regs */ \ rte; .text /* * Vector table. This is used for initial platform startup. * These vectors are to catch any un-intended traps. */ _vectors: INITSP: .long 0x00000000 /* Initial SP */ INITPC: .long _START /* Initial PC */ vector02: .long _FAULT /* Access Error */ vector03: .long _FAULT /* Address Error */ vector04: .long _FAULT /* Illegal Instruction */ vector05: .long _FAULT /* Reserved */ vector06: .long _FAULT /* Reserved */ vector07: .long _FAULT /* Reserved */ vector08: .long _FAULT /* Privilege Violation */ vector09: .long _FAULT /* Trace */ vector0A: .long _FAULT /* Unimplemented A-Line */ vector0B: .long _FAULT /* Unimplemented F-Line */ vector0C: .long _FAULT /* Debug Interrupt */ vector0D: .long _FAULT /* Reserved */ vector0E: .long _FAULT /* Format Error */ vector0F: .long _FAULT /* Unitialized Int. */ /* Reserved */ vector10_17: .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT vector18: .long _FAULT /* Spurious Interrupt */ vector19: .long _FAULT /* Autovector Level 1 */ vector1A: .long _FAULT /* Autovector Level 2 */ vector1B: .long _FAULT /* Autovector Level 3 */ vector1C: .long _FAULT /* Autovector Level 4 */ vector1D: .long _FAULT /* Autovector Level 5 */ vector1E: .long _FAULT /* Autovector Level 6 */ vector1F: .long _FAULT /* Autovector Level 7 */ /* TRAP #0 - #15 */ vector20_2F: .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT /* Reserved */ vector30_3F: .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT vector64_127: .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 vector128_191: .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 vector192_255: .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 .text .globl _start _start: nop nop move.w #0x2700,%sr /* Mask off Interrupt */ /* Set vector base register at the beginning of the Flash */ move.l #CFG_FLASH_BASE, %d0 movec %d0, %VBR move.l #(CFG_INIT_RAM_ADDR + CFG_INIT_RAM_CTRL), %d0 movec %d0, %RAMBAR0 move.l #(CFG_INIT_RAM1_ADDR + CFG_INIT_RAM1_CTRL), %d0 movec %d0, %RAMBAR1 move.l #CFG_MBAR, %d0 /* set MBAR address */ move.c %d0, %MBAR /* invalidate and disable cache */ move.l #0x01040100, %d0 /* Invalidate cache cmd */ movec %d0, %CACR /* Invalidate cache */ move.l #0, %d0 movec %d0, %ACR0 movec %d0, %ACR1 movec %d0, %ACR2 movec %d0, %ACR3 /* initialize general use internal ram */ move.l #0, %d0 move.l #(ICACHE_STATUS), %a1 /* icache */ move.l #(DCACHE_STATUS), %a2 /* icache */ move.l #(CACR_STATUS), %a3 /* CACR */ move.l %d0, (%a1) move.l %d0, (%a2) move.l %d0, (%a3) /* set stackpointer to end of internal ram to get some stackspace for the first c-code */ move.l #(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp clr.l %sp@- move.l #__got_start, %a5 /* put relocation table address to a5 */ bsr cpu_init_f /* run low-level CPU init code (from flash) */ bsr board_init_f /* run low-level board init code (from flash) */ /* 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. * * r3 = dest * r4 = src * r5 = length in bytes * r6 = cachelinesize */ .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 #CFG_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 - CFG_MONITOR_BASE), %a1 jmp (%a1) in_ram: clear_bss: /* * Now clear BSS segment */ move.l %a0, %a1 add.l #(_sbss - CFG_MONITOR_BASE),%a1 move.l %a0, %d1 add.l #(_ebss - CFG_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 - CFG_MONITOR_BASE),%a1 move.l %a1,%a5 /* * fix got pointer register a5 */ move.l %a0, %a2 add.l #(__got_end - CFG_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 - CFG_MONITOR_BASE), %a1 /* set parameters for board_init_r */ move.l %a0,-(%sp) /* dest_addr */ move.l %d0,-(%sp) /* gd */ jsr (%a1) /*------------------------------------------------------------------------------*/ /* exception code */ .globl _fault _fault: jmp _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 /*------------------------------------------------------------------------------*/ /* cache functions */ .globl icache_enable icache_enable: move.l #(CFG_SDRAM_BASE + 0x1c000), %d0 movec %d0, %ACR2 /* Enable cache */ move.l #0x020C8100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Enable cache */ nop move.l #(ICACHE_STATUS), %a1 moveq #1, %d0 move.l %d0, (%a1) rts .globl icache_disable icache_disable: move.l #0x000C8100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Disable cache */ clr.l %d0 /* Setup cache mask */ movec %d0, %ACR2 movec %d0, %ACR3 move.l #(ICACHE_STATUS), %a1 moveq #0, %d0 move.l %d0, (%a1) rts .globl icache_invalid icache_invalid: move.l #0x000C8100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Enable cache */ rts .globl icache_status icache_status: move.l #(ICACHE_STATUS), %a1 move.l (%a1), %d0 rts .globl dcache_enable dcache_enable: bsr icache_disable move.l #(CFG_SDRAM_BASE + 0xc000), %d0 movec %d0, %ACR0 /* Enable cache */ move.l #0xA30C8100, %d0 /* Invalidate cache cmd */ movec %d0, %CACR /* Invalidate cache */ move.l #(DCACHE_STATUS), %a1 moveq #1, %d0 move.l %d0, (%a1) rts .globl dcache_disable dcache_disable: move.l #0xA30C8100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Disable cache */ clr.l %d0 /* Setup cache mask */ movec %d0, %ACR0 movec %d0, %ACR1 move.l #(DCACHE_STATUS), %a1 moveq #0, %d0 move.l %d0, (%a1) rts .globl dcache_status dcache_status: move.l #(DCACHE_STATUS), %a1 move.l (%a1), %d0 rts /*------------------------------------------------------------------------------*/ .globl version_string version_string: .ascii U_BOOT_VERSION .ascii " (", __DATE__, " - ", __TIME__, ")" .ascii CONFIG_IDENT_STRING, "\0"