forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
159 lines
5.1 KiB
C
159 lines
5.1 KiB
C
/*
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* The VGA aribiter manages VGA space routing and VGA resource decode to
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* allow multiple VGA devices to be used in a system in a safe way.
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*
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* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
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* (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef LINUX_VGA_H
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#define LINUX_VGA_H
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#include <video/vga.h>
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/* Legacy VGA regions */
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#define VGA_RSRC_NONE 0x00
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#define VGA_RSRC_LEGACY_IO 0x01
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#define VGA_RSRC_LEGACY_MEM 0x02
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#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
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/* Non-legacy access */
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#define VGA_RSRC_NORMAL_IO 0x04
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#define VGA_RSRC_NORMAL_MEM 0x08
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/* Passing that instead of a pci_dev to use the system "default"
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* device, that is the one used by vgacon. Archs will probably
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* have to provide their own vga_default_device();
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*/
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#define VGA_DEFAULT_DEVICE (NULL)
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struct pci_dev;
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/* For use by clients */
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/**
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* vga_set_legacy_decoding
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*
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* @pdev: pci device of the VGA card
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* @decodes: bit mask of what legacy regions the card decodes
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*
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* Indicates to the arbiter if the card decodes legacy VGA IOs,
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* legacy VGA Memory, both, or none. All cards default to both,
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* the card driver (fbdev for example) should tell the arbiter
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* if it has disabled legacy decoding, so the card can be left
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* out of the arbitration process (and can be safe to take
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* interrupts at any time.
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*/
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#if defined(CONFIG_VGA_ARB)
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extern void vga_set_legacy_decoding(struct pci_dev *pdev,
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unsigned int decodes);
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#else
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static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
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unsigned int decodes) { };
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#endif
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#if defined(CONFIG_VGA_ARB)
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extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
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#else
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static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; }
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#endif
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/**
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* vga_get_interruptible
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to true.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_interruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 1);
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}
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/**
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* vga_get_uninterruptible - shortcut to vga_get()
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to false.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_uninterruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 0);
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}
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#if defined(CONFIG_VGA_ARB)
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extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);
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#else
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static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; }
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#endif
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#if defined(CONFIG_VGA_ARB)
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extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
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#else
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#define vga_put(pdev, rsrc)
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#endif
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#ifdef CONFIG_VGA_ARB
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extern struct pci_dev *vga_default_device(void);
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extern void vga_set_default_device(struct pci_dev *pdev);
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#else
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static inline struct pci_dev *vga_default_device(void) { return NULL; };
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static inline void vga_set_default_device(struct pci_dev *pdev) { };
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#endif
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/*
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* Architectures should define this if they have several
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* independent PCI domains that can afford concurrent VGA
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* decoding
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*/
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#ifndef __ARCH_HAS_VGA_CONFLICT
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static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
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{
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return 1;
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}
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#endif
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#if defined(CONFIG_VGA_ARB)
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int vga_client_register(struct pci_dev *pdev, void *cookie,
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void (*irq_set_state)(void *cookie, bool state),
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unsigned int (*set_vga_decode)(void *cookie, bool state));
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#else
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static inline int vga_client_register(struct pci_dev *pdev, void *cookie,
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void (*irq_set_state)(void *cookie, bool state),
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unsigned int (*set_vga_decode)(void *cookie, bool state))
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{
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return 0;
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}
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#endif
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#endif /* LINUX_VGA_H */
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