I am having some difficulties understanding the address of the ITS in the GIC-500 IC.In the imx8qm reference manual, I get the information that GIC is mapped in the 0x51a00000. Then checking the memory mapping of the GIC-500, I assume that the ITS memory map address is ...
另一个是系统总线,CPU 通过系统总线访问 gic 的内部寄存器,因此,gic 也是一个 memory map 类型的设备.尽管它和 uart 这些外设一样都是通过系统总线进行访问,但是 gic 是处理器内部实现的. 所体现出来的区别就是,针对多核架构,gic 可以实现 bank 寄存器,bank 寄存器的概念在 CPU 体系架构中经常见到,也就是一个...
这种方式利用了内存虚拟化的工作方式:对应distributor和Redistributor的guest物理地址不被映射(map)在stage...
在映射GIC-400的memory map I/O space的时候,我们只是映射了Distributor和CPU interface的寄存器地址空间,和虚拟化处理相关的寄存器没有映射,因此这个版本的GIC driver应该是不支持虚拟化的(不知道后续版本是否支持,在一个嵌入式平台上支持虚拟化有实际意义吗?最先支持虚拟化的应该是ARM64+GICV3/4这样的平台)。 要...
reg属性定义了GIC的memory map的地址,有两段,分别描述了CPU interface和Distributor的地址段。理解CPU interface和Distributor这两个术语需要GIC的一些基本的硬件知识,参考下节描述。 三、GIC的HW block diagram描述 1、GIC HW概述 GIC的block diagram如下图所示: ...
reg属性定义了GIC的memory map的地址,有两段,分别描述了CPU interface和Distributor的地址段。理解CPU interface和Distributor这两个术语需要GIC的一些基本的硬件知识,参考下节描述。 三、GIC的HW block diagram描述 1、GIC HW概述 GIC的block diagram如下图所示: ...
GIC(Generic Interrupt Controller)是ARM公司提供的⼀个通⽤的中断控制器。GIC通过 AMBA(Advanced Microcontroller Bus Architecture)这样的⽚上总线连接到⼀个或者多个ARM processor上。本⽂主要分析了linux kernel中GIC中断控制器的驱动代码。具体的分析⽅法是按照source code为索引,逐段分析。对于每⼀段...
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void memory_map(int *ttb , unsigned int va , unsigned int pa) { ttb[va >> 20] = (pa & 0xfff00000) | 2 ; } void enable_mmu(unsigned int virtualaddress , unsigned int physicsaddress) { unsigned int systemctl = 0; unsigned int *ttb = (void *)0x73000000 ; ...
Address offsets are relative to the Distributor base address defined by the system memory map. Offsets that are not shown are Reserved and RAZ/WI. Accesses to these offsets might be reported in error record 0 as a SYN_ACE_BAD access. Table 4-2 Distributor registers (GICD/GICDA) ...