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Add a function to report whether the operating system may ignore the boot

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configuration of PCI resources for a given bus.
This commit is contained in:
jmcneill 2018-10-21 11:04:26 +00:00
parent c4336712ef
commit 16d1d11300
2 changed files with 63 additions and 3 deletions
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63
sys/dev/acpi/acpi_pci.c
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@ -1,4 +1,4 @@
/* $NetBSD: acpi_pci.c,v 1.23 2018/10/15 10:00:30 jmcneill Exp $ */
/* $NetBSD: acpi_pci.c,v 1.24 2018/10/21 11:04:26 jmcneill Exp $ */
/*
* Copyright (c) 2009, 2010 The NetBSD Foundation, Inc.
@ -29,7 +29,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_pci.c,v 1.23 2018/10/15 10:00:30 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: acpi_pci.c,v 1.24 2018/10/21 11:04:26 jmcneill Exp $");
#include <sys/param.h>
#include <sys/device.h>
@ -57,6 +57,14 @@ static ACPI_STATUS acpi_pcidev_pciroot_bus(ACPI_HANDLE, uint16_t *);
static ACPI_STATUS acpi_pcidev_pciroot_bus_callback(ACPI_RESOURCE *,
void *);
/*
* UUID for _DSM control method, from PCI Firmware Specification.
*/
static UINT8 acpi_pci_dsm_uuid[ACPI_UUID_LENGTH] = {
0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
};
/*
* Regarding PCI Segment Groups (ACPI 4.0, p. 277):
*
@ -459,3 +467,54 @@ acpi_pcidev_find_dev(struct acpi_devnode *ad)
return dv;
}
/*
* acpi_pci_ignore_boot_config:
*
* Returns 1 if the operating system may ignore the boot configuration
* of PCI resources.
*/
ACPI_INTEGER
acpi_pci_ignore_boot_config(ACPI_HANDLE handle)
{
ACPI_OBJECT_LIST objs;
ACPI_OBJECT obj[4], *pobj;
ACPI_BUFFER buf;
ACPI_INTEGER ret;
objs.Count = 4;
objs.Pointer = obj;
obj[0].Type = ACPI_TYPE_BUFFER;
obj[0].Buffer.Length = ACPI_UUID_LENGTH;
obj[0].Buffer.Pointer = acpi_pci_dsm_uuid;
obj[1].Type = ACPI_TYPE_INTEGER;
obj[1].Integer.Value = 1;
obj[2].Type = ACPI_TYPE_INTEGER;
obj[2].Integer.Value = 5;
obj[3].Type = ACPI_TYPE_PACKAGE;
obj[3].Package.Count = 0;
obj[3].Package.Elements = NULL;
buf.Pointer = NULL;
buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
if (ACPI_FAILURE(AcpiEvaluateObject(handle, "_DSM", &objs, &buf)) || buf.Pointer == NULL)
return 0;
ret = 0;
pobj = buf.Pointer;
switch (pobj->Type) {
case ACPI_TYPE_INTEGER:
ret = pobj->Integer.Value;
break;
case ACPI_TYPE_PACKAGE:
if (pobj->Package.Count == 1 && pobj->Package.Elements[0].Type == ACPI_TYPE_INTEGER)
ret = pobj->Package.Elements[0].Integer.Value;
break;
}
ACPI_FREE(buf.Pointer);
return ret;
}

3
sys/dev/acpi/acpi_pci.h
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@ -1,4 +1,4 @@
/* $NetBSD: acpi_pci.h,v 1.9 2018/10/15 10:00:30 jmcneill Exp $ */
/* $NetBSD: acpi_pci.h,v 1.10 2018/10/21 11:04:26 jmcneill Exp $ */
/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
@ -38,5 +38,6 @@ struct acpi_devnode *acpi_pcidev_find(uint16_t, uint16_t,
uint16_t, uint16_t);
device_t acpi_pcidev_find_dev(struct acpi_devnode *);
struct acpi_devnode *acpi_pciroot_find(uint16_t, uint16_t);
ACPI_INTEGER acpi_pci_ignore_boot_config(ACPI_HANDLE);
#endif /* !_SYS_DEV_ACPI_ACPI_PCI_H */