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7f0938eac5
For some reasons shrouded in mystery, the code saving the FEL state was saving the SCTLR register twice, with the second copy trying to justify itself by using its ancient "control register" alias name. Drop the redundant second copy, both from the fel_stash data structure, and also the code saving and restoring it. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Samuel Holland <samuel@sholland.org> Tested-by: Samuel Holland <samuel@sholland.org>
38 lines
800 B
ArmAsm
38 lines
800 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Utility functions for FEL mode.
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*
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* Copyright (c) 2015 Google, Inc
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <asm/system.h>
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#include <linux/linkage.h>
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ENTRY(save_boot_params)
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ldr r0, =fel_stash
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str sp, [r0, #0]
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str lr, [r0, #4]
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mrs lr, cpsr @ Read CPSR
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str lr, [r0, #8]
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mrc p15, 0, lr, c1, c0, 0 @ Read CP15 SCTLR Register
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str lr, [r0, #12]
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mrc p15, 0, lr, c12, c0, 0 @ Read VBAR
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str lr, [r0, #16]
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b save_boot_params_ret
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ENDPROC(save_boot_params)
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ENTRY(return_to_fel)
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mov sp, r0
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mov lr, r1
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ldr r0, =fel_stash
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ldr r1, [r0, #16]
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mcr p15, 0, r1, c12, c0, 0 @ Write VBAR
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ldr r1, [r0, #12]
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mcr p15, 0, r1, c1, c0, 0 @ Write CP15 SCTLR Register
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ldr r1, [r0, #8]
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msr cpsr, r1 @ Write CPSR
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bx lr
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ENDPROC(return_to_fel)
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