Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\aperture_64.c Create Date:2022-07-28 08:53:03
Last Modify:2020-03-17 10:38:51 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:Look for an AGP bridge

Proto:static unsigned int __init search_agp_bridge(unsigned int *order, int *valid_agp)

Type:unsigned int

Parameter:

TypeParameterName
unsigned int *order
int *valid_agp
231  When bus < 256 cycle
232  When slot < 32 cycle
233  When func < 8 cycle
236  class = Direct PCI access. This is used for PCI accesses in early boot beforethe PCI subsystem works.
238  If class == 0xffffffff Then Break
242  Case >> == PCI_CLASS_BRIDGE_HOST
243  Case >> == PCI_CLASS_BRIDGE_OTHER
245  cap = Find a PCI capability
247  If Not cap Then Break
249  valid_agp = 1
250  Return Read a standard AGPv3 bridge header
255  type = read_pci_config_byte(bus, slot, func, 8 bits )
257  If Not (type & 0x80) Then Break
262  pr_info("No AGP bridge found\n")
264  Return 0
Caller
NameDescribe
early_gart_iommu_checkWith kexec/kdump, if the first kernel doesn't shut down the GART and the* second kernel allocates a different GART region, there might be two* overlapping GART regions present:* - the first still used by the GART initialized in the first kernel.
gart_iommu_hole_init