函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\aperture_64.c Create Date:2022-07-27 09:52:23
Last Modify:2020-03-17 10:38:51 Copyright©Brick
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函数名称：Look for an AGP bridge

函数原型：static unsigned int __init search_agp_bridge(unsigned int *order, int *valid_agp)

返回类型：unsigned int

参数：

类型参数名称
unsigned int *order
int *valid_agp
231  以bus小于256循环
232  以slot小于32循环
233  以func小于8循环
236  class等于Direct PCI access. This is used for PCI accesses in early boot beforethe PCI subsystem works.
238  如果class恒等于0xffffffff则退出
242  当: >> == PCI_CLASS_BRIDGE_HOST
243  当: >> == PCI_CLASS_BRIDGE_OTHER
245  cap等于Find a PCI capability
247  如果非cap则退出
249  valid_agp等于1
250  返回:Read a standard AGPv3 bridge header
255  type等于read_pci_config_byte(bus, slot, func, 8 bits )
257  如果非type按位与0x80的值则退出
262  打印信息("No AGP bridge found\n")
264  返回:0
调用者
名称描述
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