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We originally added asm-prototypes.h in commit42f5b4cacd("powerpc: Introduce asm-prototypes.h"). It's purpose was for prototypes of C functions that are only called from asm, in order to fix sparse warnings about missing prototypes. A few months later Nick added a different use case in commit4efca4ed05("kbuild: modversions for EXPORT_SYMBOL() for asm") for C prototypes for exported asm functions. This is basically the inverse of our original usage. Since then we've added various prototypes to asm-prototypes.h for both reasons, meaning we now need to unstitch it all. Dispatch prototypes of C functions into relevant headers and keep only the prototypes for functions defined in assembly. For the time being, leave prom_init() there because moving it into asm/prom.h or asm/setup.h conflicts with drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowrom.o This will be fixed later by untaggling asm/pci.h and asm/prom.h or by renaming the function in shadowrom.c Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/62d46904eca74042097acf4cb12c175e3067f3d1.1646413435.git.christophe.leroy@csgroup.eu
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (C) IBM Corporation, 2011
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*
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* Authors: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
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* Anton Blanchard <anton@au.ibm.com>
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*/
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#include <linux/uaccess.h>
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#include <linux/hardirq.h>
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#include <asm/switch_to.h>
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int enter_vmx_usercopy(void)
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{
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if (in_interrupt())
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return 0;
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preempt_disable();
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/*
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* We need to disable page faults as they can call schedule and
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* thus make us lose the VMX context. So on page faults, we just
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* fail which will cause a fallback to the normal non-vmx copy.
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*/
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pagefault_disable();
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enable_kernel_altivec();
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return 1;
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}
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/*
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* This function must return 0 because we tail call optimise when calling
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* from __copy_tofrom_user_power7 which returns 0 on success.
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*/
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int exit_vmx_usercopy(void)
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{
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disable_kernel_altivec();
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pagefault_enable();
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preempt_enable();
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return 0;
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}
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int enter_vmx_ops(void)
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{
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if (in_interrupt())
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return 0;
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preempt_disable();
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enable_kernel_altivec();
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return 1;
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}
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/*
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* All calls to this function will be optimised into tail calls. We are
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* passed a pointer to the destination which we return as required by a
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* memcpy implementation.
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*/
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void *exit_vmx_ops(void *dest)
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{
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disable_kernel_altivec();
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preempt_enable();
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return dest;
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}
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