mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 05:42:58 +00:00
2f16ac9df4
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Francois Bedard <fbedard@synopsys.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Heiko Schocher <hs@denx.de>
241 lines
4.7 KiB
ArmAsm
241 lines
4.7 KiB
ArmAsm
/*
|
|
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include <asm/arcregs.h>
|
|
|
|
/*
|
|
* Note on the LD/ST addressing modes with address register write-back
|
|
*
|
|
* LD.a same as LD.aw
|
|
*
|
|
* LD.a reg1, [reg2, x] => Pre Incr
|
|
* Eff Addr for load = [reg2 + x]
|
|
*
|
|
* LD.ab reg1, [reg2, x] => Post Incr
|
|
* Eff Addr for load = [reg2]
|
|
*/
|
|
|
|
.macro PUSH reg
|
|
st.a \reg, [%sp, -4]
|
|
.endm
|
|
|
|
.macro PUSHAX aux
|
|
lr %r9, [\aux]
|
|
PUSH %r9
|
|
.endm
|
|
|
|
.macro SAVE_R1_TO_R24
|
|
PUSH %r1
|
|
PUSH %r2
|
|
PUSH %r3
|
|
PUSH %r4
|
|
PUSH %r5
|
|
PUSH %r6
|
|
PUSH %r7
|
|
PUSH %r8
|
|
PUSH %r9
|
|
PUSH %r10
|
|
PUSH %r11
|
|
PUSH %r12
|
|
PUSH %r13
|
|
PUSH %r14
|
|
PUSH %r15
|
|
PUSH %r16
|
|
PUSH %r17
|
|
PUSH %r18
|
|
PUSH %r19
|
|
PUSH %r20
|
|
PUSH %r21
|
|
PUSH %r22
|
|
PUSH %r23
|
|
PUSH %r24
|
|
.endm
|
|
|
|
.macro SAVE_ALL_SYS
|
|
|
|
st %r0, [%sp]
|
|
lr %r0, [%ecr]
|
|
st %r0, [%sp, 8] /* ECR */
|
|
st %sp, [%sp, 4]
|
|
|
|
SAVE_R1_TO_R24
|
|
PUSH %r25
|
|
PUSH %gp
|
|
PUSH %fp
|
|
PUSH %blink
|
|
PUSHAX %eret
|
|
PUSHAX %erstatus
|
|
PUSH %lp_count
|
|
PUSHAX %lp_end
|
|
PUSHAX %lp_start
|
|
PUSHAX %erbta
|
|
.endm
|
|
|
|
.align 4
|
|
.globl _start
|
|
_start:
|
|
/* Critical system events */
|
|
j reset /* 0 - 0x000 */
|
|
j memory_error /* 1 - 0x008 */
|
|
j instruction_error /* 2 - 0x010 */
|
|
|
|
/* Device interrupts */
|
|
.rept 29
|
|
j interrupt_handler /* 3:31 - 0x018:0xF8 */
|
|
.endr
|
|
/* Exceptions */
|
|
j EV_MachineCheck /* 0x100, Fatal Machine check (0x20) */
|
|
j EV_TLBMissI /* 0x108, Intruction TLB miss (0x21) */
|
|
j EV_TLBMissD /* 0x110, Data TLB miss (0x22) */
|
|
j EV_TLBProtV /* 0x118, Protection Violation (0x23)
|
|
or Misaligned Access */
|
|
j EV_PrivilegeV /* 0x120, Privilege Violation (0x24) */
|
|
j EV_Trap /* 0x128, Trap exception (0x25) */
|
|
j EV_Extension /* 0x130, Extn Intruction Excp (0x26) */
|
|
|
|
memory_error:
|
|
SAVE_ALL_SYS
|
|
lr %r0, [%efa]
|
|
mov %r1, %sp
|
|
j do_memory_error
|
|
|
|
instruction_error:
|
|
SAVE_ALL_SYS
|
|
lr %r0, [%efa]
|
|
mov %r1, %sp
|
|
j do_instruction_error
|
|
|
|
interrupt_handler:
|
|
/* Todo - save and restore CPU context when interrupts will be in use */
|
|
bl do_interrupt_handler
|
|
rtie
|
|
|
|
EV_MachineCheck:
|
|
SAVE_ALL_SYS
|
|
lr %r0, [%efa]
|
|
mov %r1, %sp
|
|
j do_machine_check_fault
|
|
|
|
EV_TLBMissI:
|
|
SAVE_ALL_SYS
|
|
mov %r0, %sp
|
|
j do_itlb_miss
|
|
|
|
EV_TLBMissD:
|
|
SAVE_ALL_SYS
|
|
mov %r0, %sp
|
|
j do_dtlb_miss
|
|
|
|
EV_TLBProtV:
|
|
SAVE_ALL_SYS
|
|
lr %r0, [%efa]
|
|
mov %r1, %sp
|
|
j do_tlb_prot_violation
|
|
|
|
EV_PrivilegeV:
|
|
SAVE_ALL_SYS
|
|
mov %r0, %sp
|
|
j do_privilege_violation
|
|
|
|
EV_Trap:
|
|
SAVE_ALL_SYS
|
|
mov %r0, %sp
|
|
j do_trap
|
|
|
|
EV_Extension:
|
|
SAVE_ALL_SYS
|
|
mov %r0, %sp
|
|
j do_extension
|
|
|
|
|
|
reset:
|
|
/* Setup interrupt vector base that matches "__text_start" */
|
|
sr __text_start, [ARC_AUX_INTR_VEC_BASE]
|
|
|
|
/* Setup stack pointer */
|
|
mov %sp, CONFIG_SYS_INIT_SP_ADDR
|
|
mov %fp, %sp
|
|
|
|
/* Clear bss */
|
|
mov %r0, __bss_start
|
|
mov %r1, __bss_end
|
|
|
|
clear_bss:
|
|
st.ab 0, [%r0, 4]
|
|
brlt %r0, %r1, clear_bss
|
|
|
|
/* Zero the one and only argument of "board_init_f" */
|
|
mov_s %r0, 0
|
|
j board_init_f
|
|
|
|
/*
|
|
* void relocate_code (addr_sp, gd, addr_moni)
|
|
*
|
|
* This "function" does not return, instead it continues in RAM
|
|
* after relocating the monitor code.
|
|
*
|
|
* r0 = start_addr_sp
|
|
* r1 = new__gd
|
|
* r2 = relocaddr
|
|
*/
|
|
.align 4
|
|
.globl relocate_code
|
|
relocate_code:
|
|
/*
|
|
* r0-r12 might be clobbered by C functions
|
|
* so we use r13-r16 for storage here
|
|
*/
|
|
mov %r13, %r0 /* save addr_sp */
|
|
mov %r14, %r1 /* save addr of gd */
|
|
mov %r15, %r2 /* save addr of destination */
|
|
|
|
mov %r16, %r2 /* %r9 - relocation offset */
|
|
sub %r16, %r16, __image_copy_start
|
|
|
|
/* Set up the stack */
|
|
stack_setup:
|
|
mov %sp, %r13
|
|
mov %fp, %sp
|
|
|
|
/* Check if monitor is loaded right in place for relocation */
|
|
mov %r0, __image_copy_start
|
|
cmp %r0, %r15 /* skip relocation if code loaded */
|
|
bz do_board_init_r /* in target location already */
|
|
|
|
/* Copy data (__image_copy_start - __image_copy_end) to new location */
|
|
mov %r1, %r15
|
|
mov %r2, __image_copy_end
|
|
sub %r2, %r2, %r0 /* r3 <- amount of bytes to copy */
|
|
asr %r2, %r2, 2 /* r3 <- amount of words to copy */
|
|
mov %lp_count, %r2
|
|
lp copy_end
|
|
ld.ab %r2,[%r0,4]
|
|
st.ab %r2,[%r1,4]
|
|
copy_end:
|
|
|
|
/* Fix relocations related issues */
|
|
bl do_elf_reloc_fixups
|
|
#ifndef CONFIG_SYS_ICACHE_OFF
|
|
bl invalidate_icache_all
|
|
#endif
|
|
#ifndef CONFIG_SYS_DCACHE_OFF
|
|
bl flush_dcache_all
|
|
#endif
|
|
|
|
/* Update position of intterupt vector table */
|
|
lr %r0, [ARC_AUX_INTR_VEC_BASE] /* Read current position */
|
|
add %r0, %r0, %r16 /* Update address */
|
|
sr %r0, [ARC_AUX_INTR_VEC_BASE] /* Write new position */
|
|
|
|
do_board_init_r:
|
|
/* Prepare for exection of "board_init_r" in relocated monitor */
|
|
mov %r2, board_init_r /* old address of "board_init_r()" */
|
|
add %r2, %r2, %r16 /* new address of "board_init_r()" */
|
|
mov %r0, %r14 /* 1-st parameter: gd_t */
|
|
mov %r1, %r15 /* 2-nd parameter: dest_addr */
|
|
j [%r2]
|