mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 09:48:16 +00:00
32afad783e
Both big-endian and little-endian are tested with below commands: Rom version: (Default, Now we config it as rom version) qemu-system-mips64el -M mips -bios u-boot.bin -cpu MIPS64R2-generic -nographic qemu-system-mips64 -M mips -bios u-boot.bin -cpu MIPS64R2-generic -nographic Ram version: qemu-system-mips64el -M mips -cpu MIPS64R2-generic -kernel u-boot -nographic qemu-system-mips64 -M mips -cpu MIPS64R2-generic -kernel u-boot -nographic Signed-off-by: Zhizhou Zhang <etou.zh@gmail.com> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
256 lines
5 KiB
ArmAsm
256 lines
5 KiB
ArmAsm
/*
|
|
* Startup Code for MIPS64 CPU-core
|
|
*
|
|
* Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
|
|
*
|
|
* 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 dlater 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 PARTICUdlaR 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 Pdlace, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/mipsregs.h>
|
|
|
|
#ifndef CONFIG_SYS_MIPS_CACHE_MODE
|
|
#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT
|
|
#endif
|
|
|
|
/*
|
|
* For the moment disable interrupts, mark the kernel mode and
|
|
* set ST0_KX so that the CPU does not spit fire when using
|
|
* 64-bit addresses.
|
|
*/
|
|
.macro setup_c0_status set clr
|
|
.set push
|
|
mfc0 t0, CP0_STATUS
|
|
or t0, ST0_CU0 | \set | 0x1f | \clr
|
|
xor t0, 0x1f | \clr
|
|
mtc0 t0, CP0_STATUS
|
|
.set noreorder
|
|
sll zero, 3 # ehb
|
|
.set pop
|
|
.endm
|
|
|
|
.set noreorder
|
|
|
|
.globl _start
|
|
.text
|
|
_start:
|
|
.org 0x000
|
|
b reset
|
|
nop
|
|
.org 0x080
|
|
b romReserved
|
|
nop
|
|
.org 0x100
|
|
b romReserved
|
|
nop
|
|
.org 0x180
|
|
b romReserved
|
|
nop
|
|
.org 0x200
|
|
b romReserved
|
|
nop
|
|
.org 0x280
|
|
b romReserved
|
|
nop
|
|
.org 0x300
|
|
b romReserved
|
|
nop
|
|
.org 0x380
|
|
b romReserved
|
|
nop
|
|
.org 0x480
|
|
b romReserved
|
|
nop
|
|
|
|
/*
|
|
* We hope there are no more reserved vectors!
|
|
* 128 * 8 == 1024 == 0x400
|
|
* so this is address R_VEC+0x400 == 0xbfc00400
|
|
*/
|
|
.org 0x500
|
|
.align 4
|
|
reset:
|
|
|
|
/* Clear watch registers */
|
|
dmtc0 zero, CP0_WATCHLO
|
|
dmtc0 zero, CP0_WATCHHI
|
|
|
|
/* WP(Watch Pending), SW0/1 should be cleared */
|
|
mtc0 zero, CP0_CAUSE
|
|
|
|
setup_c0_status ST0_KX 0
|
|
|
|
/* Init Timer */
|
|
mtc0 zero, CP0_COUNT
|
|
mtc0 zero, CP0_COMPARE
|
|
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
/* CONFIG0 register */
|
|
dli t0, CONF_CM_UNCACHED
|
|
mtc0 t0, CP0_CONFIG
|
|
#endif
|
|
|
|
/* Initialize $gp */
|
|
bal 1f
|
|
nop
|
|
.dword _gp
|
|
1:
|
|
ld gp, 0(ra)
|
|
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
/* Initialize any external memory */
|
|
dla t9, lowlevel_init
|
|
jalr t9
|
|
nop
|
|
|
|
/* Initialize caches... */
|
|
dla t9, mips_cache_reset
|
|
jalr t9
|
|
nop
|
|
|
|
/* ... and enable them */
|
|
dli t0, CONFIG_SYS_MIPS_CACHE_MODE
|
|
mtc0 t0, CP0_CONFIG
|
|
#endif
|
|
|
|
/* Set up temporary stack */
|
|
dli t0, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
|
|
dla sp, 0(t0)
|
|
|
|
dla 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
|
|
|
|
dli t0, CONFIG_SYS_MONITOR_BASE
|
|
dla t3, in_ram
|
|
ld t2, -24(t3) # t2 <-- uboot_end_data
|
|
move t1, a2
|
|
move s2, a2 # s2 <-- destination address
|
|
|
|
/*
|
|
* Fix $gp:
|
|
*
|
|
* New $gp = (Old $gp - CONFIG_SYS_MONITOR_BASE) + Destination Address
|
|
*/
|
|
move t8, gp
|
|
dsub gp, CONFIG_SYS_MONITOR_BASE
|
|
dadd gp, a2 # gp now adjusted
|
|
dsub s1, gp, t8 # s1 <-- relocation offset
|
|
|
|
/*
|
|
* t0 = source address
|
|
* t1 = target address
|
|
* t2 = source end address
|
|
*/
|
|
|
|
/*
|
|
* Save destination address and size for dlater usage in flush_cache()
|
|
*/
|
|
move s0, a1 # save gd in s0
|
|
move a0, t1 # a0 <-- destination addr
|
|
dsub a1, t2, t0 # a1 <-- size
|
|
|
|
1:
|
|
lw t3, 0(t0)
|
|
sw t3, 0(t1)
|
|
daddu t0, 4
|
|
ble t0, t2, 1b
|
|
daddu t1, 4
|
|
|
|
/* If caches were enabled, we would have to flush them here. */
|
|
|
|
/* a0 & a1 are already set up for flush_cache(start, size) */
|
|
dla t9, flush_cache
|
|
jalr t9
|
|
nop
|
|
|
|
/* Jump to where we've relocated ourselves */
|
|
daddi t0, s2, in_ram - _start
|
|
jr t0
|
|
nop
|
|
|
|
.dword _gp
|
|
.dword _GLOBAL_OFFSET_TABLE_
|
|
.dword uboot_end_data
|
|
.dword uboot_end
|
|
.dword 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.
|
|
*/
|
|
ld t3, -8(t0) # t3 <-- num_got_entries
|
|
ld t8, -32(t0) # t8 <-- _GLOBAL_OFFSET_TABLE_
|
|
ld t9, -40(t0) # t9 <-- _gp
|
|
dsub t8, t9 # compute offset
|
|
dadd t8, t8, gp # t8 now holds relocated _G_O_T_
|
|
daddi t8, t8, 16 # skipping first two entries
|
|
dli t2, 2
|
|
1:
|
|
ld t1, 0(t8)
|
|
beqz t1, 2f
|
|
dadd t1, s1
|
|
sd t1, 0(t8)
|
|
2:
|
|
daddi t2, 1
|
|
blt t2, t3, 1b
|
|
daddi t8, 8
|
|
|
|
/* Clear BSS */
|
|
ld t1, -24(t0) # t1 <-- uboot_end_data
|
|
ld t2, -16(t0) # t2 <-- uboot_end
|
|
dadd t1, s1 # adjust pointers
|
|
dadd t2, s1
|
|
|
|
dsub t1, 8
|
|
1:
|
|
daddi t1, 8
|
|
bltl t1, t2, 1b
|
|
sd zero, 0(t1)
|
|
|
|
move a0, s0 # a0 <-- gd
|
|
dla t9, board_init_r
|
|
jr t9
|
|
move a1, s2
|
|
|
|
.end relocate_code
|
|
|
|
/* Exception handlers */
|
|
romReserved:
|
|
b romReserved
|