mirror of
https://github.com/antonblanchard/microwatt.git
synced 2026-04-27 04:47:05 +00:00
6aadad5a75
It will look for an ELF binary at the flash offset specified for the board (currently 0x300000 on Arty but that could be changed). Note: litedram is regenerated in order to rebuild the init code, which was done using a newer version of litedram from LiteX. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
104 lines
2.3 KiB
ArmAsm
104 lines
2.3 KiB
ArmAsm
/* Copyright 2013-2014 IBM Corp.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
* implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define STACK_TOP 0xff004000
|
|
|
|
#define FIXUP_ENDIAN \
|
|
tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
|
|
b 191f; /* Skip trampoline if endian is good */ \
|
|
.long 0xa600607d; /* mfmsr r11 */ \
|
|
.long 0x01006b69; /* xori r11,r11,1 */ \
|
|
.long 0x05009f42; /* bcl 20,31,$+4 */ \
|
|
.long 0xa602487d; /* mflr r10 */ \
|
|
.long 0x14004a39; /* addi r10,r10,20 */ \
|
|
.long 0xa64b5a7d; /* mthsrr0 r10 */ \
|
|
.long 0xa64b7b7d; /* mthsrr1 r11 */ \
|
|
.long 0x2402004c; /* hrfid */ \
|
|
191:
|
|
|
|
|
|
/* Load an immediate 64-bit value into a register */
|
|
#define LOAD_IMM64(r, e) \
|
|
lis r,(e)@highest; \
|
|
ori r,r,(e)@higher; \
|
|
rldicr r,r, 32, 31; \
|
|
oris r,r, (e)@h; \
|
|
ori r,r, (e)@l;
|
|
|
|
.section ".head","ax"
|
|
|
|
. = 0
|
|
.global start
|
|
start:
|
|
FIXUP_ENDIAN
|
|
|
|
/* setup stack */
|
|
LOAD_IMM64(%r1, STACK_TOP - 0x100)
|
|
LOAD_IMM64(%r12, main)
|
|
mtctr %r12,
|
|
bctrl
|
|
mtctr %r3
|
|
bctr
|
|
|
|
/* XXX: litedram init should not take exceptions, maybe we could get
|
|
* rid of these to save space, along with a core tweak to suppress
|
|
* exceptions in case they happen (just terminate ?)
|
|
*/
|
|
|
|
#define EXCEPTION(nr) \
|
|
.= nr; \
|
|
b .
|
|
|
|
/* More exception stubs */
|
|
EXCEPTION(0x100)
|
|
EXCEPTION(0x200)
|
|
EXCEPTION(0x300)
|
|
EXCEPTION(0x380)
|
|
EXCEPTION(0x400)
|
|
EXCEPTION(0x480)
|
|
EXCEPTION(0x500)
|
|
EXCEPTION(0x600)
|
|
EXCEPTION(0x700)
|
|
EXCEPTION(0x800)
|
|
EXCEPTION(0x900)
|
|
EXCEPTION(0x980)
|
|
EXCEPTION(0xa00)
|
|
EXCEPTION(0xb00)
|
|
EXCEPTION(0xc00)
|
|
EXCEPTION(0xd00)
|
|
EXCEPTION(0xe00)
|
|
EXCEPTION(0xe20)
|
|
EXCEPTION(0xe40)
|
|
EXCEPTION(0xe60)
|
|
EXCEPTION(0xe80)
|
|
EXCEPTION(0xf00)
|
|
EXCEPTION(0xf20)
|
|
EXCEPTION(0xf40)
|
|
EXCEPTION(0xf60)
|
|
EXCEPTION(0xf80)
|
|
#if 0
|
|
EXCEPTION(0x1000)
|
|
EXCEPTION(0x1100)
|
|
EXCEPTION(0x1200)
|
|
EXCEPTION(0x1300)
|
|
EXCEPTION(0x1400)
|
|
EXCEPTION(0x1500)
|
|
EXCEPTION(0x1600)
|
|
#endif
|
|
|
|
.text
|
|
|