cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

shadowof.c (2377B)

      1/*
      2 * Copyright 2012 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 */
     23#include "priv.h"
     24
     25#include <core/pci.h>
     26
     27#if defined(__powerpc__)
     28struct priv {
     29	const void __iomem *data;
     30	int size;
     31};
     32
     33static u32
     34of_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
     35{
     36	struct priv *priv = data;
     37	if (offset < priv->size) {
     38		length = min_t(u32, length, priv->size - offset);
     39		memcpy_fromio(bios->data + offset, priv->data + offset, length);
     40		return length;
     41	}
     42	return 0;
     43}
     44
     45static u32
     46of_size(void *data)
     47{
     48	struct priv *priv = data;
     49	return priv->size;
     50}
     51
     52static void *
     53of_init(struct nvkm_bios *bios, const char *name)
     54{
     55	struct nvkm_device *device = bios->subdev.device;
     56	struct pci_dev *pdev = device->func->pci(device)->pdev;
     57	struct device_node *dn;
     58	struct priv *priv;
     59	if (!(dn = pci_device_to_OF_node(pdev)))
     60		return ERR_PTR(-ENODEV);
     61	if (!(priv = kzalloc(sizeof(*priv), GFP_KERNEL)))
     62		return ERR_PTR(-ENOMEM);
     63	if ((priv->data = of_get_property(dn, "NVDA,BMP", &priv->size)))
     64		return priv;
     65	kfree(priv);
     66	return ERR_PTR(-EINVAL);
     67}
     68
     69const struct nvbios_source
     70nvbios_of = {
     71	.name = "OpenFirmware",
     72	.init = of_init,
     73	.fini = (void(*)(void *))kfree,
     74	.read = of_read,
     75	.size = of_size,
     76	.rw = false,
     77	.ignore_checksum = true,
     78	.no_pcir = true,
     79};
     80#else
     81const struct nvbios_source
     82nvbios_of = {
     83};
     84#endif