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/*
* The PCI Library -- Darwin kIOACPI access
*
* Copyright (c) 2013 Apple, Inc.
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include "internal.h"
#include <mach/mach_error.h>
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOKitKeys.h>
enum {
kACPIMethodAddressSpaceRead = 0,
kACPIMethodAddressSpaceWrite = 1,
kACPIMethodDebuggerCommand = 2,
kACPIMethodCount
};
#pragma pack(1)
typedef UInt32 IOACPIAddressSpaceID;
enum {
kIOACPIAddressSpaceIDSystemMemory = 0,
kIOACPIAddressSpaceIDSystemIO = 1,
kIOACPIAddressSpaceIDPCIConfiguration = 2,
kIOACPIAddressSpaceIDEmbeddedController = 3,
kIOACPIAddressSpaceIDSMBus = 4
};
/*
* 64-bit ACPI address
*/
union IOACPIAddress {
UInt64 addr64;
struct {
unsigned int offset :16;
unsigned int function :3;
unsigned int device :5;
unsigned int bus :8;
unsigned int segment :16;
unsigned int reserved :16;
} pci;
};
typedef union IOACPIAddress IOACPIAddress;
#pragma pack()
struct AddressSpaceParam {
UInt64 value;
UInt32 spaceID;
IOACPIAddress address;
UInt32 bitWidth;
UInt32 bitOffset;
UInt32 options;
};
typedef struct AddressSpaceParam AddressSpaceParam;
static void
darwin_config(struct pci_access *a UNUSED)
{
}
static int
darwin_detect(struct pci_access *a)
{
io_registry_entry_t service;
io_connect_t connect;
kern_return_t status;
service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleACPIPlatformExpert"));
if (service)
{
status = IOServiceOpen(service, mach_task_self(), 0, &connect);
IOObjectRelease(service);
}
if (!service || (kIOReturnSuccess != status))
{
a->warning("Cannot open AppleACPIPlatformExpert (add boot arg debug=0x144 & run as root)");
return 0;
}
a->debug("...using AppleACPIPlatformExpert");
a->fd = connect;
return 1;
}
static void
darwin_init(struct pci_access *a UNUSED)
{
}
static void
darwin_cleanup(struct pci_access *a UNUSED)
{
}
static int
darwin_read(struct pci_dev *d, int pos, byte *buf, int len)
{
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_read(d, pos, buf, len);
AddressSpaceParam param;
kern_return_t status;
param.spaceID = kIOACPIAddressSpaceIDPCIConfiguration;
param.bitWidth = len * 8;
param.bitOffset = 0;
param.options = 0;
param.address.pci.offset = pos;
param.address.pci.function = d->func;
param.address.pci.device = d->dev;
param.address.pci.bus = d->bus;
param.address.pci.segment = d->domain;
param.address.pci.reserved = 0;
param.value = -1ULL;
size_t outSize = sizeof(param);
status = IOConnectCallStructMethod(d->access->fd, kACPIMethodAddressSpaceRead,
¶m, sizeof(param),
¶m, &outSize);
if ((kIOReturnSuccess != status))
d->access->error("darwin_read: kACPIMethodAddressSpaceRead failed: %s", mach_error_string(status));
switch (len)
{
case 1:
buf[0] = (u8) param.value;
break;
case 2:
((u16 *) buf)[0] = cpu_to_le16((u16) param.value);
break;
case 4:
((u32 *) buf)[0] = cpu_to_le32((u32) param.value);
break;
}
return 1;
}
static int
darwin_write(struct pci_dev *d, int pos, byte *buf, int len)
{
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_write(d, pos, buf, len);
AddressSpaceParam param;
kern_return_t status;
param.spaceID = kIOACPIAddressSpaceIDPCIConfiguration;
param.bitWidth = len * 8;
param.bitOffset = 0;
param.options = 0;
param.address.pci.offset = pos;
param.address.pci.function = d->func;
param.address.pci.device = d->dev;
param.address.pci.bus = d->bus;
param.address.pci.segment = d->domain;
param.address.pci.reserved = 0;
switch (len)
{
case 1:
param.value = buf[0];
break;
case 2:
param.value = le16_to_cpu(((u16 *) buf)[0]);
break;
case 4:
param.value = le32_to_cpu(((u32 *) buf)[0]);
break;
}
size_t outSize = 0;
status = IOConnectCallStructMethod(d->access->fd, kACPIMethodAddressSpaceWrite,
¶m, sizeof(param),
NULL, &outSize);
if ((kIOReturnSuccess != status))
d->access->error("darwin_read: kACPIMethodAddressSpaceWrite failed: %s", mach_error_string(status));
return 1;
}
struct pci_methods pm_darwin = {
.name = "darwin",
.help = "Darwin",
.config = darwin_config,
.detect = darwin_detect,
.init = darwin_init,
.cleanup = darwin_cleanup,
.scan = pci_generic_scan,
.fill_info = pci_generic_fill_info,
.read = darwin_read,
.write = darwin_write,
};
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