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<p class="MsoNormal"><span lang="EN-US">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> I’m working to emulate a RAM allocator on barrelfish mem_serv.I used lib mm to initialize and allocate the RAM in mem_serv’s way, but now I encountered a problem.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When I allocate a small RAM from a big block, we use slot_prealloc_refill function to refill a slab, then the refill func need to retype the node which is found in the mm_node tree. In this way, the node could not be
retyped because it can’t be looked up(Case 1: At first I used cnode_super to be the mem_cap which is not initialized in a user domain). Then I used the ACPI’s way instead (I create a cnode and cnoderef to do cnode_super’s job and also create the mem_cap from
a RAM), when I use cap_copy to create a cap from RAM, it is INVALID to retype(case 2).
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Case1:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">ERROR: failed to init slot allocator<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( libmm) Nested failure in slot allocator calling mm_alloc [MM_ERR_SLOT_MM_ALLOC]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( libbarrelfish) Failure in cap_retype() [LIB_ERR_CAP_RETYPE]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( kernel) Error looking up source capability [SYS_ERR_SOURCE_CAP_LOOKUP]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( kernel) Capability not found (empty slot encountered) [SYS_ERR_CAP_NOT_FOUND]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Aborted<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Case 2:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">ERROR: failed to init slot allocator<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( libmm) Nested failure in slot allocator calling mm_alloc [MM_ERR_SLOT_MM_ALLOC]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( libbarrelfish) Failure in cap_retype() [LIB_ERR_CAP_RETYPE]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Failure: ( kernel) Invalid source/destination type pair for retyping [SYS_ERR_INVALID_RETYPE]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US">Aborted<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:189.0pt;mso-para-margin-left:18.0gd"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So, How mem_serv’s mm_node struct define the cap? (Is it the node’s corresponding RAM which manages base & size or another thing?)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Which type the cap should be? Which type should I use? (CNode/RAM/Fram/…?)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">How the cap’s type transfer when I chunk a node? (Because cap_retype defines the cap must be CNode type, and transfer to mm_ram’s registed type. Should it transfer from CNODE to RAM?)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best Regards<o:p></o:p></span></p>
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