Tag Archives: DMA
Memory mapped operation from user space on devices is a powerful technique to improve runtime performance. Some ARM processors use caches keyed to virtual addresses, instead of normally to physical addresses. The problem, is that if the kernel maps the … Continue reading →
In his blog “Turning on an ARM MMU” Andrew Murry listed the schemes: a memory manager would use in their combination form: Split the entire virtual range into pages and point them all to one same physical page. This is … Continue reading →
Memory mapped operation from user space on devices is a powerful technique to improve runtime performance of a user space application. The technique, conceptually is simple, yet is often hard to do correctly.