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/*
* Startup Code for MIPS32 XBURST CPU-core
*
* Copyright (c) 2010 Xiangfu Liu <xiangfu@sharism.cc>
*
* 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>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/cacheops.h>
.set noreorder
.globl _start
.text
_start:
/* Initialize $gp */
bal 1f
nop
.word _gp
1:
lw gp, 0(ra)
/* Set up temporary stack */
li sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
la t9, board_init_f
jr t9
nop
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
* This "function" does not return, instead it continues in RAM
* after relocating the monitor code.
*
* a0 = addr_sp
* a1 = gd
* a2 = destination address
*/
.globl relocate_code
.ent relocate_code
relocate_code:
move sp, a0 # set new stack pointer
li t0, CONFIG_SYS_MONITOR_BASE
la t3, in_ram
lw t2, -12(t3) # t2 <-- uboot_end_data
move t1, a2
/*
* Fix $gp:
*
* New $gp = (Old $gp - CONFIG_SYS_MONITOR_BASE) + Destination Address
*/
move t6, gp
sub gp, CONFIG_SYS_MONITOR_BASE
add gp, a2 # gp now adjusted
sub t6, gp, t6 # t6 <-- relocation offset
/*
* t0 = source address
* t1 = target address
* t2 = source end address
*/
1:
lw t3, 0(t0)
sw t3, 0(t1)
addu t0, 4
blt t0, t2, 1b
addu t1, 4
/* If caches were enabled, we would have to flush them here. */
/* flush d-cache */
li t0, KSEG0
addi t1, t0, CONFIG_SYS_DCACHE_SIZE
2:
cache INDEX_WRITEBACK_INV_D, 0(t0)
bne t0, t1, 2b
addi t0, CONFIG_SYS_CACHELINE_SIZE
sync
/* flush i-cache */
li t0, KSEG0
addi t1, t0, CONFIG_SYS_ICACHE_SIZE
3:
cache INDEX_INVALIDATE_I, 0(t0)
bne t0, t1, 3b
addi t0, CONFIG_SYS_CACHELINE_SIZE
/* Invalidate BTB */
mfc0 t0, CP0_CONFIG, 7
nop
ori t0, 2
mtc0 t0, CP0_CONFIG, 7
nop
/* Jump to where we've relocated ourselves */
addi t0, a2, in_ram - _start
jr t0
nop
.word _gp
.word _GLOBAL_OFFSET_TABLE_
.word uboot_end_data
.word uboot_end
.word num_got_entries
in_ram:
/*
* Now we want to update GOT.
*
* GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
* generated by GNU ld. Skip these reserved entries from relocation.
*/
lw t3, -4(t0) # t3 <-- num_got_entries
lw t4, -16(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
lw t5, -20(t0) # t5 <-- _gp
sub t4, t5 # compute offset
add t4, t4, gp # t4 now holds relocated _G_O_T_
addi t4, t4, 8 # skipping first two entries
li t2, 2
1:
lw t1, 0(t4)
beqz t1, 2f
add t1, t6
sw t1, 0(t4)
2:
addi t2, 1
blt t2, t3, 1b
addi t4, 4
/* Clear BSS */
lw t1, -12(t0) # t1 <-- uboot_end_data
lw t2, -8(t0) # t2 <-- uboot_end
add t1, t6 # adjust pointers
add t2, t6
sub t1, 4
1: addi t1, 4
bltl t1, t2, 1b
sw zero, 0(t1)
move a0, a1 # a0 <-- gd
la t9, board_init_r
jr t9
move a1, a2
.end relocate_code
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