arm64: Drop dead file stage_entry.S
This file has been dead since commit 7dcf9d51 (arm64: tegra132:
tegra210: Remove old arm64/stage_entry.S), I just forgot to remove it.
Change-Id: I0dd6666371036ecd42c1b256dbbe22a01ae959b8
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/27236
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Julius Werner
parent
1da5fb67b0
commit
905e1e763e
|
|
@ -1,135 +0,0 @@
|
|||
/*
|
||||
* This file is part of the coreboot project.
|
||||
*
|
||||
* Copyright 2014 Google Inc.
|
||||
*
|
||||
* 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; version 2 of the License.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
/*
|
||||
* ======================== stage_entry.S =====================================
|
||||
* This file acts as an entry point to the different stages of arm64. They share
|
||||
* the same process of setting up stacks and jumping to c code. It is important
|
||||
* to save x25 from corruption as it contains the argument for rmodule.
|
||||
* =============================================================================
|
||||
*/
|
||||
|
||||
#include <arch/asm.h>
|
||||
#define __ASSEMBLY__
|
||||
#include <arch/lib_helpers.h>
|
||||
|
||||
#define STACK_SZ CONFIG_STACK_SIZE
|
||||
#define EXCEPTION_STACK_SZ CONFIG_STACK_SIZE
|
||||
|
||||
/*
|
||||
* Stack for armv8 CPU grows down from _estack. Additionally, provide exception
|
||||
* stack for the CPU.
|
||||
*/
|
||||
.section .bss, "aw", @nobits
|
||||
|
||||
.global _stack
|
||||
.global _estack
|
||||
.balign STACK_SZ
|
||||
_stack:
|
||||
.space STACK_SZ
|
||||
_estack:
|
||||
|
||||
.global _stack_exceptions
|
||||
.global _estack_exceptions
|
||||
.balign EXCEPTION_STACK_SZ
|
||||
_stack_exceptions:
|
||||
.space EXCEPTION_STACK_SZ
|
||||
_estack_exceptions:
|
||||
|
||||
ENTRY(cpu_get_stack)
|
||||
ldr x0, 1f
|
||||
ret
|
||||
.align 3
|
||||
1:
|
||||
.quad _estack
|
||||
ENDPROC(cpu_get_stack)
|
||||
|
||||
ENTRY(cpu_get_exception_stack)
|
||||
ldr x0, 1f
|
||||
ret
|
||||
.align 3
|
||||
1:
|
||||
.quad _estack_exceptions
|
||||
ENDPROC(cpu_get_exception_stack)
|
||||
|
||||
/*
|
||||
* Boot strap the processor into a C environemnt. That consists of providing
|
||||
* 16-byte aligned stack. The programming enviroment uses SP_EL0 as its main
|
||||
* stack while keeping SP_ELx reserved for exception entry.
|
||||
*/
|
||||
/*
|
||||
* IMPORTANT: Ensure x25 is not corrupted because it saves the argument to
|
||||
* any rmodules.
|
||||
*/
|
||||
ENTRY(arm64_c_environment)
|
||||
/* Set the exception stack for the CPU. */
|
||||
bl cpu_get_exception_stack
|
||||
msr SPSel, #1
|
||||
isb
|
||||
mov sp, x0
|
||||
|
||||
/* Have stack pointer use SP_EL0. */
|
||||
msr SPSel, #0
|
||||
isb
|
||||
|
||||
/* Set the non-exception stack for the CPU. */
|
||||
bl cpu_get_stack
|
||||
mov sp, x0
|
||||
|
||||
/* Get entry point by dereferencing c_entry. */
|
||||
ldr x1, 1f
|
||||
/* Move back the arguments from x25 to x0 */
|
||||
mov x0, x25
|
||||
br x1
|
||||
.align 3
|
||||
1:
|
||||
.quad c_entry
|
||||
ENDPROC(arm64_c_environment)
|
||||
|
||||
ENTRY(_start)
|
||||
/* Save any arguments to current rmodule in x25 */
|
||||
mov x25, x0
|
||||
b arm64_c_environment
|
||||
ENDPROC(_start)
|
||||
|
||||
/*
|
||||
* Setup SCTLR so that:
|
||||
* Little endian mode is setup, XN is not enforced, MMU and caches are disabled.
|
||||
* Alignment and stack alignment checks are disabled.
|
||||
*/
|
||||
.macro setup_sctlr
|
||||
read_current x0, sctlr
|
||||
bic x0, x0, #(1 << 25) /* Little Endian */
|
||||
bic x0, x0, #(1 << 19) /* XN not enforced */
|
||||
bic x0, x0, #(1 << 12) /* Disable Instruction Cache */
|
||||
bic x0, x0, #0xf /* Clear SA, C, A and M */
|
||||
write_current sctlr, x0, x1
|
||||
.endm
|
||||
|
||||
CPU_RESET_ENTRY(arm64_cpu_startup)
|
||||
bl arm64_cpu_early_setup
|
||||
setup_sctlr
|
||||
b arm64_c_environment
|
||||
ENDPROC(arm64_cpu_startup)
|
||||
|
||||
/*
|
||||
* stage_entry is defined as a weak symbol to allow SoCs/CPUs to define a custom
|
||||
* entry point to perform any fixups that need to be done immediately after
|
||||
* power on reset. In case SoC/CPU does not need any custom-defined entrypoint,
|
||||
* this weak symbol can be used to jump directly to arm64_cpu_startup.
|
||||
*/
|
||||
ENTRY_WEAK(stage_entry)
|
||||
b arm64_cpu_startup
|
||||
ENDPROC(stage_entry)
|
||||
Loading…
Reference in New Issue