cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cs5536_pci.c (2132B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * read/write operation to the PCI config space of CS5536
      4 *
      5 * Copyright (C) 2007 Lemote, Inc.
      6 * Author : jlliu, liujl@lemote.com
      7 *
      8 * Copyright (C) 2009 Lemote, Inc.
      9 * Author: Wu Zhangjin, wuzhangjin@gmail.com
     10 *
     11 *	the Virtual Support Module(VSM) for virtulizing the PCI
     12 *	configure space are defined in cs5536_modulename.c respectively,
     13 *
     14 *	after this virtulizing, user can access the PCI configure space
     15 *	directly as a normal multi-function PCI device which follows
     16 *	the PCI-2.2 spec.
     17 */
     18
     19#include <linux/types.h>
     20#include <cs5536/cs5536_pci.h>
     21#include <cs5536/cs5536_vsm.h>
     22
     23enum {
     24	CS5536_FUNC_START = -1,
     25	CS5536_ISA_FUNC,
     26	reserved_func,
     27	CS5536_IDE_FUNC,
     28	CS5536_ACC_FUNC,
     29	CS5536_OHCI_FUNC,
     30	CS5536_EHCI_FUNC,
     31	CS5536_FUNC_END,
     32};
     33
     34static const cs5536_pci_vsm_write vsm_conf_write[] = {
     35	[CS5536_ISA_FUNC]	= pci_isa_write_reg,
     36	[reserved_func]		= NULL,
     37	[CS5536_IDE_FUNC]	= pci_ide_write_reg,
     38	[CS5536_ACC_FUNC]	= pci_acc_write_reg,
     39	[CS5536_OHCI_FUNC]	= pci_ohci_write_reg,
     40	[CS5536_EHCI_FUNC]	= pci_ehci_write_reg,
     41};
     42
     43static const cs5536_pci_vsm_read vsm_conf_read[] = {
     44	[CS5536_ISA_FUNC]	= pci_isa_read_reg,
     45	[reserved_func]		= NULL,
     46	[CS5536_IDE_FUNC]	= pci_ide_read_reg,
     47	[CS5536_ACC_FUNC]	= pci_acc_read_reg,
     48	[CS5536_OHCI_FUNC]	= pci_ohci_read_reg,
     49	[CS5536_EHCI_FUNC]	= pci_ehci_read_reg,
     50};
     51
     52/*
     53 * write to PCI config space and transfer it to MSR write.
     54 */
     55void cs5536_pci_conf_write4(int function, int reg, u32 value)
     56{
     57	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
     58		return;
     59	if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
     60		return;
     61
     62	if (vsm_conf_write[function] != NULL)
     63		vsm_conf_write[function](reg, value);
     64}
     65
     66/*
     67 * read PCI config space and transfer it to MSR access.
     68 */
     69u32 cs5536_pci_conf_read4(int function, int reg)
     70{
     71	u32 data = 0;
     72
     73	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
     74		return 0;
     75	if ((reg < 0) || ((reg & 0x03) != 0))
     76		return 0;
     77	if (reg > 0x100)
     78		return 0xffffffff;
     79
     80	if (vsm_conf_read[function] != NULL)
     81		data = vsm_conf_read[function](reg);
     82
     83	return data;
     84}