How does OpenSPARC translate Virtual Address to Physical Address or Vice V

The i386 page address system has three levels: dir, page, offset. The 32 bits virtual address consists of dir, page, offset. When the process releases a virtual address to read a memory content, the MMU of i386 will translate the virtual address to physical address as follows:1,Based on the value of CR3 register and dir of virtual address, MMU returns the base address of page.2, Based on the the base address of page and value of page of virtual address, MMU returns the base address of physical page.3, Based on the base address of physical page and value of offset of virtual address, MMU returns physical memory address. 4, Read the content of physical memory address.
However, when I read the source code of the bw_r_tlb of OpenSPARC�s MMU, I am puzzled. I am not clear how is the page address system of OpenSPARC implement.
Will you offer me some hints about it ? And are there any documents about it?
Thanks a lot!

It would be good to add the definition of Hypervisor in the wikipedia.
Thanks
[email protected] wrote:
> I have downloaded the source code of linux-2.6.17.9 version. In the arch directory of linux-2.6.17.9, I
find the Hypervisor API (such as sun4v_intr_setstate, sun4v_intr_gettarget) has been
integrated with Linux kernel. In other words, it is implemented in Linux kernel. All the time, I think
Hypervisor API is an independent layer which provides an easy way to switch among all kinds of OS. But now,
I find it is a part of Linux. If so, what a role does Hypervisor API take? Why do we name it Hypervisor API
rather than a part of Linux? It do puzzle me, am I wrong?
The Hypervisor API ("application programming interface") is fully described in the UltraSPARC T1 Hypervisor API Specification, which is downloadable from page http://opensparc-t1.sunsource.net/index.html .
As a brief digression ... the term "Hypervisor API" has always seemed a bit oxymoronic to me -- given the historic equivalency of "application" to "nonprivileged". After all, isn't it more of an "SPI" (supervisor programming interface) because it services privileged supervisor (operating system) software, not nonprivileged (application) software? But if you think of a guest OS as an "application" (in the general sense of the word) supported by the Hypervisor, then "Hypervisor API" makes some sense.
Now, regarding Hypervisor API and Linux. If you read the UltraSPARC T1 Hypervisor API Specification, you'll find that Hypervisor API calls are defined (appropriately enough) in terms of native SPARC assembly language. I haven't looked at the Linux source code, but I'd bet a considerable sum of money that the Linux sun4v_intr_gettarget() function is a C-language wrapper around a SPARC assemly-language routine that sets up arguments, performs a trap to the Hypervisor intr_gettarget function, and returns the result(s) to the caller.
In any case, all actual Hypervisor code is fully implemented in the Hypervisor, not in Linux or Solaris or FreeBSD or Wind River Linux or any other OS running on top of the Hypervisor. Each OS may implement some "wrapper" code around Hypervisor calls, but no actual Hypervisor functionality actually resides in a guest OS. In fact, it can't reside in a guest OS because it must run in hyperprivileged mode and guest operating systems run in "merely" Privileged mode.
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