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/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/acpica/acpi_resource.c 223383 2011-06-21 21:30:20Z jhb $");
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <dev/acpica/acpivar.h>
/* Hooks for the ACPI CA debugging infrastructure */
#define _COMPONENT ACPI_BUS
ACPI_MODULE_NAME("RESOURCE")
struct lookup_irq_request {
ACPI_RESOURCE *acpi_res;
struct resource *res;
int counter;
int rid;
int found;
};
static ACPI_STATUS
acpi_lookup_irq_handler(ACPI_RESOURCE *res, void *context)
{
struct lookup_irq_request *req;
size_t len;
u_int irqnum, irq;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_IRQ:
irqnum = res->Data.Irq.InterruptCount;
irq = res->Data.Irq.Interrupts[0];
len = ACPI_RS_SIZE(ACPI_RESOURCE_IRQ);
break;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
irqnum = res->Data.ExtendedIrq.InterruptCount;
irq = res->Data.ExtendedIrq.Interrupts[0];
len = ACPI_RS_SIZE(ACPI_RESOURCE_EXTENDED_IRQ);
break;
default:
return (AE_OK);
}
if (irqnum != 1)
return (AE_OK);
req = (struct lookup_irq_request *)context;
if (req->counter != req->rid) {
req->counter++;
return (AE_OK);
}
req->found = 1;
KASSERT(irq == rman_get_start(req->res),
("IRQ resources do not match"));
bcopy(res, req->acpi_res, len);
return (AE_CTRL_TERMINATE);
}
ACPI_STATUS
acpi_lookup_irq_resource(device_t dev, int rid, struct resource *res,
ACPI_RESOURCE *acpi_res)
{
struct lookup_irq_request req;
ACPI_STATUS status;
req.acpi_res = acpi_res;
req.res = res;
req.counter = 0;
req.rid = rid;
req.found = 0;
status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
acpi_lookup_irq_handler, &req);
if (ACPI_SUCCESS(status) && req.found == 0)
status = AE_NOT_FOUND;
return (status);
}
void
acpi_config_intr(device_t dev, ACPI_RESOURCE *res)
{
u_int irq;
int pol, trig;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_IRQ:
KASSERT(res->Data.Irq.InterruptCount == 1,
("%s: multiple interrupts", __func__));
irq = res->Data.Irq.Interrupts[0];
trig = res->Data.Irq.Triggering;
pol = res->Data.Irq.Polarity;
break;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
KASSERT(res->Data.ExtendedIrq.InterruptCount == 1,
("%s: multiple interrupts", __func__));
irq = res->Data.ExtendedIrq.Interrupts[0];
trig = res->Data.ExtendedIrq.Triggering;
pol = res->Data.ExtendedIrq.Polarity;
break;
default:
panic("%s: bad resource type %u", __func__, res->Type);
}
BUS_CONFIG_INTR(dev, irq, (trig == ACPI_EDGE_SENSITIVE) ?
INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL, (pol == ACPI_ACTIVE_HIGH) ?
INTR_POLARITY_HIGH : INTR_POLARITY_LOW);
}
struct acpi_resource_context {
struct acpi_parse_resource_set *set;
device_t dev;
void *context;
};
#ifdef ACPI_DEBUG_OUTPUT
static const char *
acpi_address_range_name(UINT8 ResourceType)
{
static char buf[16];
switch (ResourceType) {
case ACPI_MEMORY_RANGE:
return ("Memory");
case ACPI_IO_RANGE:
return ("IO");
case ACPI_BUS_NUMBER_RANGE:
return ("Bus Number");
default:
snprintf(buf, sizeof(buf), "type %u", ResourceType);
return (buf);
}
}
#endif
static ACPI_STATUS
acpi_parse_resource(ACPI_RESOURCE *res, void *context)
{
struct acpi_parse_resource_set *set;
struct acpi_resource_context *arc;
UINT64 min, max, length, gran;
const char *name;
device_t dev;
arc = context;
dev = arc->dev;
set = arc->set;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_END_TAG:
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "EndTag\n"));
break;
case ACPI_RESOURCE_TYPE_FIXED_IO:
if (res->Data.FixedIo.AddressLength <= 0)
break;
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedIo 0x%x/%d\n",
res->Data.FixedIo.Address, res->Data.FixedIo.AddressLength));
set->set_ioport(dev, arc->context, res->Data.FixedIo.Address,
res->Data.FixedIo.AddressLength);
break;
case ACPI_RESOURCE_TYPE_IO:
if (res->Data.Io.AddressLength <= 0)
break;
if (res->Data.Io.Minimum == res->Data.Io.Maximum) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x/%d\n",
res->Data.Io.Minimum, res->Data.Io.AddressLength));
set->set_ioport(dev, arc->context, res->Data.Io.Minimum,
res->Data.Io.AddressLength);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x-0x%x/%d\n",
res->Data.Io.Minimum, res->Data.Io.Maximum,
res->Data.Io.AddressLength));
set->set_iorange(dev, arc->context, res->Data.Io.Minimum,
res->Data.Io.Maximum, res->Data.Io.AddressLength,
res->Data.Io.Alignment);
}
break;
case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
if (res->Data.FixedMemory32.AddressLength <= 0)
break;
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedMemory32 0x%x/%d\n",
res->Data.FixedMemory32.Address,
res->Data.FixedMemory32.AddressLength));
set->set_memory(dev, arc->context, res->Data.FixedMemory32.Address,
res->Data.FixedMemory32.AddressLength);
break;
case ACPI_RESOURCE_TYPE_MEMORY32:
if (res->Data.Memory32.AddressLength <= 0)
break;
if (res->Data.Memory32.Minimum == res->Data.Memory32.Maximum) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x/%d\n",
res->Data.Memory32.Minimum, res->Data.Memory32.AddressLength));
set->set_memory(dev, arc->context, res->Data.Memory32.Minimum,
res->Data.Memory32.AddressLength);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x-0x%x/%d\n",
res->Data.Memory32.Minimum, res->Data.Memory32.Maximum,
res->Data.Memory32.AddressLength));
set->set_memoryrange(dev, arc->context, res->Data.Memory32.Minimum,
res->Data.Memory32.Maximum, res->Data.Memory32.AddressLength,
res->Data.Memory32.Alignment);
}
break;
case ACPI_RESOURCE_TYPE_MEMORY24:
if (res->Data.Memory24.AddressLength <= 0)
break;
if (res->Data.Memory24.Minimum == res->Data.Memory24.Maximum) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x/%d\n",
res->Data.Memory24.Minimum, res->Data.Memory24.AddressLength));
set->set_memory(dev, arc->context, res->Data.Memory24.Minimum,
res->Data.Memory24.AddressLength);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x-0x%x/%d\n",
res->Data.Memory24.Minimum, res->Data.Memory24.Maximum,
res->Data.Memory24.AddressLength));
set->set_memoryrange(dev, arc->context, res->Data.Memory24.Minimum,
res->Data.Memory24.Maximum, res->Data.Memory24.AddressLength,
res->Data.Memory24.Alignment);
}
break;
case ACPI_RESOURCE_TYPE_IRQ:
/*
* from 1.0b 6.4.2
* "This structure is repeated for each separate interrupt
* required"
*/
set->set_irq(dev, arc->context, res->Data.Irq.Interrupts,
res->Data.Irq.InterruptCount, res->Data.Irq.Triggering,
res->Data.Irq.Polarity);
break;
case ACPI_RESOURCE_TYPE_DMA:
/*
* from 1.0b 6.4.3
* "This structure is repeated for each separate DMA channel
* required"
*/
set->set_drq(dev, arc->context, res->Data.Dma.Channels,
res->Data.Dma.ChannelCount);
break;
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "start dependent functions\n"));
set->set_start_dependent(dev, arc->context,
res->Data.StartDpf.CompatibilityPriority);
break;
case ACPI_RESOURCE_TYPE_END_DEPENDENT:
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "end dependent functions\n"));
set->set_end_dependent(dev, arc->context);
break;
case ACPI_RESOURCE_TYPE_ADDRESS16:
case ACPI_RESOURCE_TYPE_ADDRESS32:
case ACPI_RESOURCE_TYPE_ADDRESS64:
case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
switch (res->Type) {
case ACPI_RESOURCE_TYPE_ADDRESS16:
gran = res->Data.Address16.Granularity;
min = res->Data.Address16.Minimum;
max = res->Data.Address16.Maximum;
length = res->Data.Address16.AddressLength;
name = "Address16";
break;
case ACPI_RESOURCE_TYPE_ADDRESS32:
gran = res->Data.Address32.Granularity;
min = res->Data.Address32.Minimum;
max = res->Data.Address32.Maximum;
length = res->Data.Address32.AddressLength;
name = "Address32";
break;
case ACPI_RESOURCE_TYPE_ADDRESS64:
gran = res->Data.Address64.Granularity;
min = res->Data.Address64.Minimum;
max = res->Data.Address64.Maximum;
length = res->Data.Address64.AddressLength;
name = "Address64";
break;
default:
KASSERT(res->Type == ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64,
("should never happen"));
gran = res->Data.ExtAddress64.Granularity;
min = res->Data.ExtAddress64.Minimum;
max = res->Data.ExtAddress64.Maximum;
length = res->Data.ExtAddress64.AddressLength;
name = "ExtAddress64";
break;
}
if (length <= 0)
break;
if (res->Data.Address.ProducerConsumer != ACPI_CONSUMER) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
"ignored %s %s producer\n", name,
acpi_address_range_name(res->Data.Address.ResourceType)));
break;
}
if (res->Data.Address.ResourceType != ACPI_MEMORY_RANGE &&
res->Data.Address.ResourceType != ACPI_IO_RANGE) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
"ignored %s for non-memory, non-I/O\n", name));
break;
}
#ifdef __i386__
if (min > ULONG_MAX || (res->Data.Address.MaxAddressFixed && max >
ULONG_MAX)) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "ignored %s above 4G\n",
name));
break;
}
if (max > ULONG_MAX)
max = ULONG_MAX;
#endif
if (res->Data.Address.MinAddressFixed == ACPI_ADDRESS_FIXED &&
res->Data.Address.MaxAddressFixed == ACPI_ADDRESS_FIXED) {
if (res->Data.Address.ResourceType == ACPI_MEMORY_RANGE) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "%s/Memory 0x%jx/%ju\n",
name, (uintmax_t)min, (uintmax_t)length));
set->set_memory(dev, arc->context, min, length);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "%s/IO 0x%jx/%ju\n", name,
(uintmax_t)min, (uintmax_t)length));
set->set_ioport(dev, arc->context, min, length);
}
} else {
if (res->Data.Address32.ResourceType == ACPI_MEMORY_RANGE) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
"%s/Memory 0x%jx-0x%jx/%ju\n", name, (uintmax_t)min,
(uintmax_t)max, (uintmax_t)length));
set->set_memoryrange(dev, arc->context, min, max, length, gran);
} else {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "%s/IO 0x%jx-0x%jx/%ju\n",
name, (uintmax_t)min, (uintmax_t)max, (uintmax_t)length));
set->set_iorange(dev, arc->context, min, max, length, gran);
}
}
break;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
if (res->Data.ExtendedIrq.ProducerConsumer != ACPI_CONSUMER) {
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "ignored ExtIRQ producer\n"));
break;
}
set->set_ext_irq(dev, arc->context, res->Data.ExtendedIrq.Interrupts,
res->Data.ExtendedIrq.InterruptCount,
res->Data.ExtendedIrq.Triggering, res->Data.ExtendedIrq.Polarity);
break;
case ACPI_RESOURCE_TYPE_VENDOR:
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
"unimplemented VendorSpecific resource\n"));
break;
default:
break;
}
return (AE_OK);
}
/*
* Fetch a device's resources and associate them with the device.
*
* Note that it might be nice to also locate ACPI-specific resource items, such
* as GPE bits.
*
* We really need to split the resource-fetching code out from the
* resource-parsing code, since we may want to use the parsing
* code for _PRS someday.
*/
ACPI_STATUS
acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
struct acpi_parse_resource_set *set, void *arg)
{
struct acpi_resource_context arc;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
set->set_init(dev, arg, &arc.context);
arc.set = set;
arc.dev = dev;
status = AcpiWalkResources(handle, "_CRS", acpi_parse_resource, &arc);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
printf("can't fetch resources for %s - %s\n",
acpi_name(handle), AcpiFormatException(status));
return_ACPI_STATUS (status);
}
set->set_done(dev, arc.context);
return_ACPI_STATUS (AE_OK);
}
/*
* Resource-set vectors used to attach _CRS-derived resources
* to an ACPI device.
*/
static void acpi_res_set_init(device_t dev, void *arg, void **context);
static void acpi_res_set_done(device_t dev, void *context);
static void acpi_res_set_ioport(device_t dev, void *context,
uint64_t base, uint64_t length);
static void acpi_res_set_iorange(device_t dev, void *context,
uint64_t low, uint64_t high,
uint64_t length, uint64_t align);
static void acpi_res_set_memory(device_t dev, void *context,
uint64_t base, uint64_t length);
static void acpi_res_set_memoryrange(device_t dev, void *context,
uint64_t low, uint64_t high,
uint64_t length, uint64_t align);
static void acpi_res_set_irq(device_t dev, void *context, uint8_t *irq,
int count, int trig, int pol);
static void acpi_res_set_ext_irq(device_t dev, void *context,
uint32_t *irq, int count, int trig, int pol);
static void acpi_res_set_drq(device_t dev, void *context, uint8_t *drq,
int count);
static void acpi_res_set_start_dependent(device_t dev, void *context,
int preference);
static void acpi_res_set_end_dependent(device_t dev, void *context);
struct acpi_parse_resource_set acpi_res_parse_set = {
acpi_res_set_init,
acpi_res_set_done,
acpi_res_set_ioport,
acpi_res_set_iorange,
acpi_res_set_memory,
acpi_res_set_memoryrange,
acpi_res_set_irq,
acpi_res_set_ext_irq,
acpi_res_set_drq,
acpi_res_set_start_dependent,
acpi_res_set_end_dependent
};
struct acpi_res_context {
int ar_nio;
int ar_nmem;
int ar_nirq;
int ar_ndrq;
void *ar_parent;
};
static void
acpi_res_set_init(device_t dev, void *arg, void **context)
{
struct acpi_res_context *cp;
if ((cp = AcpiOsAllocate(sizeof(*cp))) != NULL) {
bzero(cp, sizeof(*cp));
cp->ar_parent = arg;
*context = cp;
}
}
static void
acpi_res_set_done(device_t dev, void *context)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
AcpiOsFree(cp);
}
static void
acpi_res_set_ioport(device_t dev, void *context, uint64_t base,
uint64_t length)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
bus_set_resource(dev, SYS_RES_IOPORT, cp->ar_nio++, base, length);
}
static void
acpi_res_set_iorange(device_t dev, void *context, uint64_t low,
uint64_t high, uint64_t length, uint64_t align)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
device_printf(dev, "I/O range not supported\n");
}
static void
acpi_res_set_memory(device_t dev, void *context, uint64_t base,
uint64_t length)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
bus_set_resource(dev, SYS_RES_MEMORY, cp->ar_nmem++, base, length);
}
static void
acpi_res_set_memoryrange(device_t dev, void *context, uint64_t low,
uint64_t high, uint64_t length, uint64_t align)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
device_printf(dev, "memory range not supported\n");
}
static void
acpi_res_set_irq(device_t dev, void *context, uint8_t *irq, int count,
int trig, int pol)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL || irq == NULL)
return;
/* This implements no resource relocation. */
if (count != 1)
return;
bus_set_resource(dev, SYS_RES_IRQ, cp->ar_nirq++, *irq, 1);
}
static void
acpi_res_set_ext_irq(device_t dev, void *context, uint32_t *irq, int count,
int trig, int pol)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL || irq == NULL)
return;
/* This implements no resource relocation. */
if (count != 1)
return;
bus_set_resource(dev, SYS_RES_IRQ, cp->ar_nirq++, *irq, 1);
}
static void
acpi_res_set_drq(device_t dev, void *context, uint8_t *drq, int count)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL || drq == NULL)
return;
/* This implements no resource relocation. */
if (count != 1)
return;
bus_set_resource(dev, SYS_RES_DRQ, cp->ar_ndrq++, *drq, 1);
}
static void
acpi_res_set_start_dependent(device_t dev, void *context, int preference)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
device_printf(dev, "dependent functions not supported\n");
}
static void
acpi_res_set_end_dependent(device_t dev, void *context)
{
struct acpi_res_context *cp = (struct acpi_res_context *)context;
if (cp == NULL)
return;
device_printf(dev, "dependent functions not supported\n");
}
/*
* Resource-owning placeholders for IO and memory pseudo-devices.
*
* This code allocates system resources that will be used by ACPI
* child devices. The acpi parent manages these resources through a
* private rman.
*/
static int acpi_sysres_rid = 100;
static int acpi_sysres_probe(device_t dev);
static int acpi_sysres_attach(device_t dev);
static device_method_t acpi_sysres_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_sysres_probe),
DEVMETHOD(device_attach, acpi_sysres_attach),
{0, 0}
};
static driver_t acpi_sysres_driver = {
"acpi_sysresource",
acpi_sysres_methods,
0,
};
static devclass_t acpi_sysres_devclass;
DRIVER_MODULE(acpi_sysresource, acpi, acpi_sysres_driver, acpi_sysres_devclass,
0, 0);
MODULE_DEPEND(acpi_sysresource, acpi, 1, 1, 1);
static int
acpi_sysres_probe(device_t dev)
{
static char *sysres_ids[] = { "PNP0C01", "PNP0C02", NULL };
if (acpi_disabled("sysresource") ||
ACPI_ID_PROBE(device_get_parent(dev), dev, sysres_ids) == NULL)
return (ENXIO);
device_set_desc(dev, "System Resource");
device_quiet(dev);
return (BUS_PROBE_DEFAULT);
}
static int
acpi_sysres_attach(device_t dev)
{
device_t bus;
struct resource_list_entry *bus_rle, *dev_rle;
struct resource_list *bus_rl, *dev_rl;
int done, type;
u_long start, end, count;
/*
* Loop through all current resources to see if the new one overlaps
* any existing ones. If so, grow the old one up and/or down
* accordingly. Discard any that are wholly contained in the old. If
* the resource is unique, add it to the parent. It will later go into
* the rman pool.
*/
bus = device_get_parent(dev);
dev_rl = BUS_GET_RESOURCE_LIST(bus, dev);
bus_rl = BUS_GET_RESOURCE_LIST(device_get_parent(bus), bus);
STAILQ_FOREACH(dev_rle, dev_rl, link) {
if (dev_rle->type != SYS_RES_IOPORT && dev_rle->type != SYS_RES_MEMORY)
continue;
start = dev_rle->start;
end = dev_rle->end;
count = dev_rle->count;
type = dev_rle->type;
done = FALSE;
STAILQ_FOREACH(bus_rle, bus_rl, link) {
if (bus_rle->type != type)
continue;
/* New resource wholly contained in old, discard. */
if (start >= bus_rle->start && end <= bus_rle->end)
break;
/* New tail overlaps old head, grow existing resource downward. */
if (start < bus_rle->start && end >= bus_rle->start) {
bus_rle->count += bus_rle->start - start;
bus_rle->start = start;
done = TRUE;
}
/* New head overlaps old tail, grow existing resource upward. */
if (start <= bus_rle->end && end > bus_rle->end) {
bus_rle->count += end - bus_rle->end;
bus_rle->end = end;
done = TRUE;
}
/* If we adjusted the old resource, we're finished. */
if (done)
break;
}
/* If we didn't merge with anything, add this resource. */
if (bus_rle == NULL)
bus_set_resource(bus, type, acpi_sysres_rid++, start, count);
}
/* After merging/moving resources to the parent, free the list. */
resource_list_free(dev_rl);
return (0);
}