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
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* ======================== stage_entry.S =====================================
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* This file acts as an entry point to the different stages of arm64. They share
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* the same process of setting up stacks and jumping to c code. It is important
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* to save x25 from corruption as it contains the argument for rmodule.
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* =============================================================================
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*/
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#include <arch/asm.h>
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#define __ASSEMBLY__
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#include <arch/lib_helpers.h>
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#define STACK_SZ CONFIG_STACK_SIZE
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#define EXCEPTION_STACK_SZ CONFIG_STACK_SIZE
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/*
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* Stack for armv8 CPU grows down from _estack. Additionally, provide exception
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* stack for the CPU.
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*/
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.section .bss, "aw", @nobits
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.global _stack
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.global _estack
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.balign STACK_SZ
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_stack:
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.space STACK_SZ
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_estack:
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.global _stack_exceptions
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.global _estack_exceptions
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.balign EXCEPTION_STACK_SZ
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_stack_exceptions:
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.space EXCEPTION_STACK_SZ
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_estack_exceptions:
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ENTRY(cpu_get_stack)
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ldr x0, 1f
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ret
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.align 3
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1:
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.quad _estack
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ENDPROC(cpu_get_stack)
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ENTRY(cpu_get_exception_stack)
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ldr x0, 1f
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ret
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.align 3
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1:
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.quad _estack_exceptions
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ENDPROC(cpu_get_exception_stack)
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/*
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* Boot strap the processor into a C environemnt. That consists of providing
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* 16-byte aligned stack. The programming enviroment uses SP_EL0 as its main
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* stack while keeping SP_ELx reserved for exception entry.
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*/
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/*
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* IMPORTANT: Ensure x25 is not corrupted because it saves the argument to
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* any rmodules.
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*/
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ENTRY(arm64_c_environment)
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/* Set the exception stack for the CPU. */
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bl cpu_get_exception_stack
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msr SPSel, #1
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isb
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mov sp, x0
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/* Have stack pointer use SP_EL0. */
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msr SPSel, #0
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isb
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/* Set the non-exception stack for the CPU. */
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bl cpu_get_stack
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mov sp, x0
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/* Get entry point by dereferencing c_entry. */
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ldr x1, 1f
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/* Move back the arguments from x25 to x0 */
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mov x0, x25
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br x1
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.align 3
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1:
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.quad c_entry
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ENDPROC(arm64_c_environment)
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ENTRY(_start)
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/* Save any arguments to current rmodule in x25 */
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mov x25, x0
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b arm64_c_environment
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ENDPROC(_start)
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/*
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* Setup SCTLR so that:
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* Little endian mode is setup, XN is not enforced, MMU and caches are disabled.
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* Alignment and stack alignment checks are disabled.
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*/
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.macro setup_sctlr
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read_current x0, sctlr
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bic x0, x0, #(1 << 25) /* Little Endian */
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bic x0, x0, #(1 << 19) /* XN not enforced */
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bic x0, x0, #(1 << 12) /* Disable Instruction Cache */
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bic x0, x0, #0xf /* Clear SA, C, A and M */
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write_current sctlr, x0, x1
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.endm
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CPU_RESET_ENTRY(arm64_cpu_startup)
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bl arm64_cpu_early_setup
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setup_sctlr
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b arm64_c_environment
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ENDPROC(arm64_cpu_startup)
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/*
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* stage_entry is defined as a weak symbol to allow SoCs/CPUs to define a custom
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* entry point to perform any fixups that need to be done immediately after
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* power on reset. In case SoC/CPU does not need any custom-defined entrypoint,
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* this weak symbol can be used to jump directly to arm64_cpu_startup.
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*/
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ENTRY_WEAK(stage_entry)
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b arm64_cpu_startup
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ENDPROC(stage_entry)
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