On Thu, 2015-06-11 at 15:44 +0100, David Woodhouse wrote: > It used to look like this > ... > Now it looks like this
That's not quite right; each root entry is for only *one* bus, and the
correct version looks more like this...
It used to look like this:
Root Table Address Register
|
V
Root Table (struct root_entry) Context Table (struct context_entry)
------------------------------ ------------------------------------
0x00: CTX TBL for bus #0 ---------> CTX entry for 00:00.0 (bits 63-0)
0x08: unused CTX entry for 00:00.0 (bits 127-64)
0x10: CTX TBL for bus #1 ----. CTX entry for 00:00.1 (bits 63-0)
... ... | ...
0xff8:unused | CTX entry for 00:1f.7 (bits 127-64)
|
|
| Context Table (struct context_entry)
| ------------------------------------
0x00: -----> CTX entry for 01:00.0 (bits 63-0)
0x00: CTX entry for 01:00.0 (bits 127-64)
0x08: CTX entry for 01:00.1 (bits 63-0)
... ...
0xff8: CTX entry for 01:1f.7 (bits 127-64)
Now it looks like this, with each context entry taking twice the amount
of space:
Root Table Address Register
|
V
Root Table (struct root_entry) Context Table (struct context_entry)
------------------------------ ------------------------------------
0x00: CTX TBL LO for bus #0 ------> CTX entry for 00:00.0 (bits 63-0)
0x08: CTX TBL HI for bus #0 --. CTX entry for 00:00.0 (bits 127-64)
0x10: CTX TBL LO for bus #1 | CTX entry for 00:00.0 (bits 191-128)
... ... | ...
0xff8:CTX TBL HI for bus #FF | CTX entry for 00:0f.7 (bits 255-192)
|
|
| Context Table (struct context_entry)
| ------------------------------------
0x00: ----> CTX entry for 00:10.0 (bits 63-0)
0x00: CTX entry for 00:10.0 (bits 127-64)
0x08: CTX entry for 00:10.0 (bits 191-128)
... ...
0xff8: CTX entry for 00:1f.7 (bits 63-0)
--
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