Ok, I figured out that Context is not for every OS process but represents a hardware context in a smp. Also realized that ptl_create_new_context is called to create a new context during cpu initialization phase. Now, can someone explain the difference between setup_qemu_switch and setup_qemu_switch_all_ctx? More importantly, when should I call the former and the latter?
Thanks, - Bhushan On Thu, Sep 20, 2012 at 5:15 PM, Vidyabhushan Mohan <[email protected]>wrote: > Hi, > I have a few questions regarding how a context is created and how context > switching happens in PTLSim. > *) When and where is a Context object created? struct Context is defined > in ptlhwdef.h > *) My understanding is that since Context is derived from CPUX86State, > each "OS" process would have it own context object. If so, when a context > switch happens in the OS, how does PTLSim switch from one Context object to > another. > *) I'm trying to pass a value stored in a register in one context, lets > say ctx.cr[3] (the page table base address stored in the cr3 register) to > a register in another context. > i.e. new_ctx.my_register = old_ctx.cr[3]. Could anyone point me to the > right way of doing this? > > Thanks a lot, > - Bhushan > >
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