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 09:52:28
Last Modify:2020-03-17 10:38:51 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：With 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.

函数原型：void __init early_gart_iommu_check(void)

返回类型：void

参数：无

292  agp_aper_order等于0
293  valid_agp等于0
295  aper_size等于0, aper_order等于0, last_aper_order等于0
296  aper_base等于0, last_aper_base等于0
297  aper_enabled等于0, last_aper_enabled等于0, last_valid等于0
299  如果非amd_gart_present()则返回
302  如果非early_pci_allowed()则返回
306  Look for an AGP bridge
308  fix等于0
309  以dev_limit循环
313  bus等于bus
314  dev_base等于dev_base
315  dev_limit等于dev_limit
317  以slot小于dev_limit循环
318  如果非Ignores subdevice/subvendor but as far as I can figure out* they're useless anyways则继续下一循环
321  ctl等于Direct PCI access. This is used for PCI accesses in early boot beforethe PCI subsystem works.
322  aper_enabled等于ctl按位与Aperture control register bits.
323  aper_order等于ctl右移1位按位与7
324  aper_size等于32乘1024乘1024左移aper_order位
325  aper_base等于Direct PCI access. This is used for PCI accesses in early boot beforethe PCI subsystem works. 按位与0x7fff
326  aper_base左移等于25位
328  如果last_valid则
329  如果aper_order不等于last_aper_order或aper_base不等于last_aper_base或aper_enabled不等于last_aper_enabled则
332  fix等于1
333  退出
337  last_aper_order等于aper_order
338  last_aper_base等于aper_base
339  last_aper_enabled等于aper_enabled
340  last_valid等于1
344  如果非fix且非aper_enabled则返回
347  如果非aper_base或非aper_size或aper_base加aper_size大于0x100000000UL则fix等于1
350  如果gart_fix_e820且非fix且aper_enabled则
351  如果e820__mapped_any(aper_base, aper_base + aper_size, E820_TYPE_RAM)则
354  打印信息("e820: reserve [mem %#010Lx-%#010Lx] for GART\n", aper_base, aper_base + aper_size - 1)
356  e820__range_add(aper_base, aper_size, E820_TYPE_RESERVED)
357  e820__update_table_print()
361  如果valid_agp则返回
365  以i小于dev_limit循环
369  bus等于bus
370  dev_base等于dev_base
371  dev_limit等于dev_limit
373  以slot小于dev_limit循环
374  如果非Ignores subdevice/subvendor but as far as I can figure out* they're useless anyways则继续下一循环
377  ctl等于Direct PCI access. This is used for PCI accesses in early boot beforethe PCI subsystem works.
378  ctl与等于Aperture control register bits. 的反
379  write_pci_config(bus, slot, 3, K8 On-cpu GART registers , ctl)