/*- * 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. * * $FreeBSD: head/sys/dev/acpica/acpi_resource.c 263975 2014-03-31 19:37:39Z imp $ */ #include "opt_acpi.h" #include #include #include #include #include #include #include #include #include #include "acpi.h" #include /* Hooks for the ACPICA 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; u_int irq __debugvar; 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; enum intr_trigger trigger; enum intr_polarity polarity; 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); } #if defined(__x86_64__) /* * XXX: Certain BIOSes have buggy AML that specify an IRQ that is * edge-sensitive and active-lo. However, edge-sensitive IRQs * should be active-hi. Force IRQs with an ISA IRQ value to be * active-hi instead. */ if (irq < 16 && trig == ACPI_EDGE_SENSITIVE && pol == ACPI_ACTIVE_LOW) pol = ACPI_ACTIVE_HIGH; #endif if (trig == ACPI_EDGE_SENSITIVE) trigger = INTR_TRIGGER_EDGE; else trigger = INTR_TRIGGER_LEVEL; if (pol == ACPI_ACTIVE_HIGH) polarity = INTR_POLARITY_HIGH; else polarity = INTR_POLARITY_LOW; if (machintr_legacy_intr_find(irq, trigger, polarity) < 0) kprintf("%s: Skip irq %d config\n", __func__, irq); else BUS_CONFIG_INTR(dev, dev, irq, trigger, polarity); } 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: ksnprintf(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; #ifdef ACPI_DEBUG const char *name; #endif 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.Address.Granularity; min = res->Data.Address16.Address.Minimum; max = res->Data.Address16.Address.Maximum; length = res->Data.Address16.Address.AddressLength; #ifdef ACPI_DEBUG name = "Address16"; #endif break; case ACPI_RESOURCE_TYPE_ADDRESS32: gran = res->Data.Address32.Address.Granularity; min = res->Data.Address32.Address.Minimum; max = res->Data.Address32.Address.Maximum; length = res->Data.Address32.Address.AddressLength; #ifdef ACPI_DEBUG name = "Address32"; #endif break; case ACPI_RESOURCE_TYPE_ADDRESS64: gran = res->Data.Address64.Address.Granularity; min = res->Data.Address64.Address.Minimum; max = res->Data.Address64.Address.Maximum; length = res->Data.Address64.Address.AddressLength; #ifdef ACPI_DEBUG name = "Address64"; #endif break; default: KASSERT(res->Type == ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64, ("should never happen")); gran = res->Data.ExtAddress64.Address.Granularity; min = res->Data.ExtAddress64.Address.Minimum; max = res->Data.ExtAddress64.Address.Maximum; length = res->Data.ExtAddress64.Address.AddressLength; #ifdef ACPI_DEBUG name = "ExtAddress64"; #endif 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; } 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) { kprintf("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, -1); } 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; uint64_t base; if (cp == NULL) return; if (align == 0) /* broken acpi resources might pass align == 0 */ align = 1; base = roundup(low, align); if (base + length - 1 <= high) { acpi_res_set_ioport(dev, context, base, length); return; } device_printf(dev, "I/O range [0x%jx,0x%jx,0x%jx,0x%jx] not supported\n", (uintmax_t)low, (uintmax_t)high, (uintmax_t)length, (uintmax_t)align); } 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, -1); } 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 [0x%jx,0x%jx,0x%jx,0x%jx] " "not supported\n", (uintmax_t)low, (uintmax_t)high, (uintmax_t)length, (uintmax_t)align); } 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, machintr_legacy_intr_cpuid(*irq)); } 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; /* There is no such IRQ at all */ if (machintr_legacy_intr_find(*irq, INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM) < 0) return; bus_set_resource(dev, SYS_RES_IRQ, cp->ar_nirq++, *irq, 1, machintr_legacy_intr_cpuid(*irq)); } 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, -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), DEVMETHOD_END }; static driver_t acpi_sysres_driver = { "acpi_sysresource", acpi_sysres_methods, 0, .gpri = KOBJ_GPRI_ACPI+2 }; static devclass_t acpi_sysres_devclass; DRIVER_MODULE(acpi_sysresource, acpi, acpi_sysres_driver, acpi_sysres_devclass, NULL, NULL); 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"); if (bootverbose == 0) 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); if (bus_rl) kprintf("busrl is not null!\n"); SLIST_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; if (bus_rl) { SLIST_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; } } else { bus_rle = NULL; } /* If we didn't merge with anything, add this resource. */ if (bus_rle == NULL) bus_set_resource(bus, type, acpi_sysres_rid++, start, count, -1); } /* After merging/moving resources to the parent, free the list. */ resource_list_free(dev_rl); return (0); }