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c642846489
The current lazy saving of the VFP registers is no longer possible with thread migration on SMP. This patch implements a per-CPU vfp-state pointer and the saving of the VFP registers at every context switch. The registers restoring is still performed in a lazy way. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
49 lines
1.2 KiB
ArmAsm
49 lines
1.2 KiB
ArmAsm
/*
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* linux/arch/arm/vfp/entry.S
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*
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* Copyright (C) 2004 ARM Limited.
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* Written by Deep Blue Solutions Limited.
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Basic entry code, called from the kernel's undefined instruction trap.
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* r0 = faulted instruction
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* r5 = faulted PC+4
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* r9 = successful return
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* r10 = thread_info structure
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* lr = failure return
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/asm-offsets.h>
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#include <asm/assembler.h>
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#include <asm/vfpmacros.h>
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.globl do_vfp
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do_vfp:
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enable_irq
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ldr r4, .LCvfp
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ldr r11, [r10, #TI_CPU] @ CPU number
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add r10, r10, #TI_VFPSTATE @ r10 = workspace
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ldr pc, [r4] @ call VFP entry point
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.LCvfp:
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.word vfp_vector
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@ This code is called if the VFP does not exist. It needs to flag the
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@ failure to the VFP initialisation code.
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__INIT
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.globl vfp_testing_entry
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vfp_testing_entry:
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ldr r0, VFP_arch_address
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str r5, [r0] @ known non-zero value
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mov pc, r9 @ we have handled the fault
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VFP_arch_address:
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.word VFP_arch
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__FINIT
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