第一个参数是被映射的 physical address(就是 "/proc/iomem" 看到的那个),第二个参数给出了映射的范围,函数的返回值则是一个 virtual address。 对于PCI 设备,PA 可通过 pci_resource_start() 获取。一个更简便的方法是使用直接以 PCI BAR 作为参数的pci_ioremap_xx_bar(),除了带来用法上的简化,该函数在 ...
实现过程主要涉及vmalloc和get_vm_area_node函数,它们负责分配vm_struct并建立页表。在x86-64架构上,虚拟地址空间被划分为多个层次,包括TB、4TB和32TB等,而MMIO映射空间通常位于vmalloc_base之下。根据不同的内存类型,如ARM的UC、WC、WT以及GRE,以及针对ARM特有的"np"(non-posted write),在32位...
*/intpci_uio_map_resource_by_index(structrte_pci_device *dev,intres_idx,structmapped_pci_resource *uio_res,intmap_idx){ ...// 省略// 打开 /dev/bus/pci/devices/{pci_addr}/resource0..N 文件if(!wc_activate || fd <0) {snprintf(devname,sizeof(devname),"%s/"PCI_PRI_FMT"/resource...
for (i = 0; i < MT76x02_N_WCIDS; i++) { struct ieee80211_sta *sta; struct ieee80211_vif *vif; struct mt76x02_sta *msta; struct mt76_wcid *wcid; void *priv; wcid = rcu_dereference_protected(dev->mt76.wcid[i], ...
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(i = 0; i < MT76x02_N_WCIDS; i++) { struct ieee80211_sta *sta; struct ieee80211_vif *vif; struct mt76x02_sta *msta; struct mt76_wcid *wcid; void *priv; wcid = rcu_dereference_protected(dev->mt76.wcid[i], lockdep_is_held(&dev->mt76.mutex)); if (!wcid) continue; ...