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Diffstat (limited to 'arch/nios2/cpu/start.S')
| -rw-r--r-- | arch/nios2/cpu/start.S | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/arch/nios2/cpu/start.S b/arch/nios2/cpu/start.S deleted file mode 100644 index 41f65ff70d..0000000000 --- a/arch/nios2/cpu/start.S +++ /dev/null @@ -1,161 +0,0 @@ -/* - * (C) Copyright 2004, Psyent Corporation <www.psyent.com> - * Scott McNutt <smcnutt@psyent.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. - * - */ - -#include <config.h> -#include <asm-generic/memory_layout.h> - -/************************************************************************* - * RESTART - ************************************************************************/ - -.section ".text_entry","ax" - -_start: - wrctl status, r0 /* Disable interrupts */ - /* ICACHE INIT -- only the icache line at the reset address - * is invalidated at reset. So the init must stay within - * the cache line size (8 words). If GERMS is used, we'll - * just be invalidating the cache a second time. If cache - * is not implemented initi behaves as nop. - */ - ori r4, r0, %lo(ICACHE_LINE_SIZE) - movhi r5, %hi(ICACHE_SIZE) - ori r5, r5, %lo(ICACHE_SIZE) -0: initi r5 - sub r5, r5, r4 - bgt r5, r0, 0b - br _except_end /* Skip the tramp */ - - /* EXCEPTION TRAMPOLINE -- the following gets copied - * to the exception address (below), but is otherwise at the - * default exception vector offset (0x0020). - */ -_except_start: - movhi et, %hi(_exception) - ori et, et, %lo(_exception) - jmp et -_except_end: - - /* INTERRUPTS -- for now, all interrupts masked and globally - * disabled. - */ - wrctl ienable, r0 /* All disabled */ - - /* DCACHE INIT -- if dcache not implemented, initd behaves as - * nop. - */ - movhi r4, %hi(DCACHE_LINE_SIZE) - ori r4, r4, %lo(DCACHE_LINE_SIZE) - movhi r5, %hi(DCACHE_SIZE) - ori r5, r5, %lo(DCACHE_SIZE) - mov r6, r0 -1: initd 0(r6) - add r6, r6, r4 - bltu r6, r5, 1b - - /* RELOCATE CODE, DATA & COMMAND TABLE -- the following code - * assumes code, data and the command table are all - * contiguous. This lets us relocate everything as a single - * block. Make sure the linker script matches this ;-) - */ - nextpc r4 -_cur: movhi r5, %hi(_cur - _start) - ori r5, r5, %lo(_cur - _start) - sub r4, r4, r5 /* r4 <- cur _start */ - mov r8, r4 - movhi r5, %hi(_start) - ori r5, r5, %lo(_start) /* r5 <- linked _start */ - beq r4, r5, 3f - - movhi r6, %hi(_edata) - ori r6, r6, %lo(_edata) -2: ldwio r7, 0(r4) - addi r4, r4, 4 - stwio r7, 0(r5) - addi r5, r5, 4 - bne r5, r6, 2b -3: - - /* ZERO BSS/SBSS -- bss and sbss are assumed to be adjacent - * and between __bss_start and _end. - */ - movhi r5, %hi(__bss_start) - ori r5, r5, %lo(__bss_start) - movhi r6, %hi(_end) - ori r6, r6, %lo(_end) - beq r5, r6, 5f - -4: stwio r0, 0(r5) - addi r5, r5, 4 - bne r5, r6, 4b -5: - - /* JUMP TO RELOC ADDR */ - movhi r4, %hi(_reloc) - ori r4, r4, %lo(_reloc) - jmp r4 -_reloc: - - /* COPY EXCEPTION TRAMPOLINE -- copy the tramp to the - * exception address. Define CONFIG_ROM_STUBS to prevent - * the copy (e.g. exception in flash or in other - * softare/firmware component). - */ -#if !defined(CONFIG_ROM_STUBS) - movhi r4, %hi(_except_start) - ori r4, r4, %lo(_except_start) - movhi r5, %hi(_except_end) - ori r5, r5, %lo(_except_end) - movhi r6, %hi(EXCEPTION_ADDR) - ori r6, r6, %lo(EXCEPTION_ADDR) - beq r4, r6, 7f /* Skip if at proper addr */ - -6: ldwio r7, 0(r4) - stwio r7, 0(r6) - addi r4, r4, 4 - addi r6, r6, 4 - bne r4, r5, 6b -7: -#endif - - /* STACK INIT -- zero top two words for call back chain. - */ - movhi sp, %hi(STACK_BASE) - ori sp, sp, %lo(STACK_BASE) - addi sp, sp, -8 - stw r0, 0(sp) - stw r0, 4(sp) - mov fp, sp - - /* Set the global pointer */ - movhi r26, %hi(_gp) - ori r26, r26, %lo(_gp) - - /* - * Call board_init -- never returns - */ - movhi r4, %hi(nios_start_barebox@h) - ori r4, r4, %lo(nios_start_barebox@h) - callr r4 - - /* NEVER RETURNS -- but branch to the _start just - * in case ;-) - */ - br _start - |