Staging
v0.5.1
v0.5.1
https://github.com/torvalds/linux
Tip revision: 021c91791a5e7e85c567452f1be3e4c2c6cb6063 authored by Linus Torvalds on 01 July 2018, 23:04:53 UTC
Linux 4.18-rc3
Linux 4.18-rc3
Tip revision: 021c917
pci-noop.c
// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/pci-noop.c
*
* Stub PCI interfaces for Jensen-specific kernels.
*/
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/syscalls.h>
#include "proto.h"
/*
* The PCI controller list.
*/
struct pci_controller *hose_head, **hose_tail = &hose_head;
struct pci_controller *pci_isa_hose;
struct pci_controller * __init
alloc_pci_controller(void)
{
struct pci_controller *hose;
hose = alloc_bootmem(sizeof(*hose));
*hose_tail = hose;
hose_tail = &hose->next;
return hose;
}
struct resource * __init
alloc_resource(void)
{
return alloc_bootmem(sizeof(struct resource));
}
SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
unsigned long, dfn)
{
struct pci_controller *hose;
/* from hose or from bus.devfn */
if (which & IOBASE_FROM_HOSE) {
for (hose = hose_head; hose; hose = hose->next)
if (hose->index == bus)
break;
if (!hose)
return -ENODEV;
} else {
/* Special hook for ISA access. */
if (bus == 0 && dfn == 0)
hose = pci_isa_hose;
else
return -ENODEV;
}
switch (which & ~IOBASE_FROM_HOSE) {
case IOBASE_HOSE:
return hose->index;
case IOBASE_SPARSE_MEM:
return hose->sparse_mem_base;
case IOBASE_DENSE_MEM:
return hose->dense_mem_base;
case IOBASE_SPARSE_IO:
return hose->sparse_io_base;
case IOBASE_DENSE_IO:
return hose->dense_io_base;
case IOBASE_ROOT_BUS:
return hose->bus->number;
}
return -EOPNOTSUPP;
}
SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
unsigned long, off, unsigned long, len, void __user *, buf)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
else
return -ENODEV;
}
SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
unsigned long, off, unsigned long, len, void __user *, buf)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
else
return -ENODEV;
}