u-boot/arch/nios2/cpu/start.S
Thomas Chou 5ff10aa7e7 nios2: add generic board support
This patch implements the generic board init as described in
doc/README.generic-board.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
Reviewed-by: Stefan Roese <sr@denx.de>
2014-08-24 11:28:10 +08:00

212 lines
5 KiB
ArmAsm

/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <version.h>
/*************************************************************************
* RESTART
************************************************************************/
.text
.global _start
_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(CONFIG_SYS_ICACHELINE_SIZE)
movhi r5, %hi(CONFIG_SYS_ICACHE_SIZE)
ori r5, r5, %lo(CONFIG_SYS_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(CONFIG_SYS_DCACHELINE_SIZE)
ori r4, r4, %lo(CONFIG_SYS_DCACHELINE_SIZE)
movhi r5, %hi(CONFIG_SYS_DCACHE_SIZE)
ori r5, r5, %lo(CONFIG_SYS_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 __bss_end.
*/
movhi r5, %hi(__bss_start)
ori r5, r5, %lo(__bss_start)
movhi r6, %hi(__bss_end)
ori r6, r6, %lo(__bss_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(CONFIG_SYS_EXCEPTION_ADDR)
ori r6, r6, %lo(CONFIG_SYS_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(CONFIG_SYS_INIT_SP)
ori sp, sp, %lo(CONFIG_SYS_INIT_SP)
addi sp, sp, -8
stw r0, 0(sp)
stw r0, 4(sp)
mov fp, sp
/*
* Call board_init_f -- never returns
*/
mov r4, r0
movhi r2, %hi(board_init_f@h)
ori r2, r2, %lo(board_init_f@h)
callr r2
/* NEVER RETURNS -- but branch to the _start just
* in case ;-)
*/
br _start
/*
* relocate_code -- Nios2 handles the relocation above. But
* the generic board code monkeys with the heap, stack, etc.
* (it makes some assumptions that may not be appropriate
* for Nios). Nevertheless, we capitulate here.
*
* We'll call the board_init_r from here since this isn't
* supposed to return.
*
* void relocate_code (ulong sp, gd_t *global_data,
* ulong reloc_addr)
* __attribute__ ((noreturn));
*/
.text
.global relocate_code
relocate_code:
mov sp, r4 /* Set the new sp */
mov r4, r5
movhi r8, %hi(board_init_r@h)
ori r8, r8, %lo(board_init_r@h)
callr r8
ret
/*
* dly_clks -- Nios2 (like Nios1) doesn't have a timebase in
* the core. For simple delay loops, we do our best by counting
* instruction cycles.
*
* Instruction performance varies based on the core. For cores
* with icache and static/dynamic branch prediction (II/f, II/s):
*
* Normal ALU (e.g. add, cmp, etc): 1 cycle
* Branch (correctly predicted, taken): 2 cycles
* Negative offset is predicted (II/s).
*
* For cores without icache and no branch prediction (II/e):
*
* Normal ALU (e.g. add, cmp, etc): 6 cycles
* Branch (no prediction): 6 cycles
*
* For simplicity, if an instruction cache is implemented we
* assume II/f or II/s. Otherwise, we use the II/e.
*
*/
.globl dly_clks
dly_clks:
#if (CONFIG_SYS_ICACHE_SIZE > 0)
subi r4, r4, 3 /* 3 clocks/loop */
#else
subi r4, r4, 12 /* 12 clocks/loop */
#endif
bge r4, r0, dly_clks
ret
.data
.globl version_string
version_string:
.ascii U_BOOT_VERSION_STRING, "\0"