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645 commits

Author SHA1 Message Date
Sean Cross
abce9eb0c1 message::move: implement movable messages 
This is the first implementation of message passing with moving memory.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-31 18:03:19 +08:00
Sean Cross
8c3f931445 messaging: first message passing example 
THis commit allows us to pass Scalar messages between processes.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-30 16:07:58 +08:00
Sean Cross
f56b5e969d server: use CtxID type instead of usize 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-30 12:35:50 +08:00
Sean Cross
9367905e6f kernel: services: don't resume sleeping processes after irq 
After an IRQ occurs, check to see if there are any available threads.
If there are none, put the process back to sleep.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 17:05:37 +08:00
Sean Cross
263e57d4aa kernel: disable lots of debug output 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 16:59:46 +08:00
Sean Cross
6b729d9ebc kernel: services: resume correct context after interrupt 
We were resuming the wrong context after returning from an interrupt.
This resulted in us resuming context 3 more often than not.

This now properly banks the current process context prior to the switch.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 16:58:04 +08:00
Sean Cross
da2036a182 kernel: services: minor documentation improvements 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 16:22:17 +08:00
Sean Cross
cfe7c4a3bc kernel: irq: take() previous process pair 
This prevents us from continuously resuming the same task

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 16:21:46 +08:00
Sean Cross
beea92ddab kernel: fix context id assignment 
previously, we were assigning the trap context as a valid ID.  This is
not valid, and causes many problems.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 15:58:59 +08:00
Sean Cross
dafec2bb89 kernel: make contexts first-class 
Due to an initial misunderstanding of how the RISC-V is architected,
contexts were going to be an emergent property of the kernel.

However, after further consideration, contexts must now be baked into
the kernel.  Switching between contexts can be handled by the scheduler,
but the kernel must keep track of processor registers.

Keep track of context IDs and ensure they are sane.  With this patch,
interrupts work, as does basic context switching.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-27 12:30:29 +08:00
Sean Cross
2ba9f69015 kernel: fix build error in main.rs 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-25 14:09:17 +08:00
Sean Cross
a723fb6a02 kernel: reflow multiple files' comments 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-25 14:07:46 +08:00
Sean Cross
fa22d9bad8 kernel: fix isr context handling 
We were loading both the context and the banked context, which resulted
in an invalid context being selected.  This caused a cascading failure.

Load only the lower halfword in order to correctly enter the interrupt
context.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-24 15:24:19 +08:00
Sean Cross
fb01359821 server: fix Connect() call 
This fixes the index in the Connect() call, so that clients can now
Connect to servers that exist.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-24 14:52:25 +08:00
Sean Cross
e298f125c9 kernel: rework server structures 
They are now inverted and mvoed into their own file.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-24 14:13:11 +08:00
Sean Cross
484e21fd30 messaging: more work on transferring messages 
Still need to work on passing messages.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 16:56:56 +08:00
Sean Cross
569a4196de kernel: return a Result from syscall::handle 
This will simplify error handling.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 14:07:54 +08:00
Sean Cross
f32596570f services: don't map messaging region to userspace 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 12:59:48 +08:00
Sean Cross
fb69426f28 kernel: riscv: print "SYSTEM HALT" when halting system 
This minor patch helps me remember that these errors are fatal.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 12:59:09 +08:00
Sean Cross
0be1b8b94c kernel: mem: don't unilaterally hand memory to userspace 
If it's needed for use in the kernel, don't hand it over.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 12:58:13 +08:00
Sean Cross
a31c4722fa kernel: add space for message reply pointer 
With this, we now have enough space to store the return context
information for when `message_reply()` is called.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-23 09:10:19 +08:00
Sean Cross
33162a1c1f services: implement basics of ReceiveMessage 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-20 17:21:34 +08:00
Sean Cross
ae473b5aa7 kernel: broken commit: add server message polling 
This [broken] commit starts to add message polling to the kernel, so a
server can use the MessageReceive call.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-19 17:25:12 +08:00
Sean Cross
04eb18e2fb kernel: add Connect stub 
It doesn't respond, but it prints a message now at least.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-19 08:54:52 +08:00
Sean Cross
ebe3efc097 kernel: properly zero out pages prior to handing them to userspace 
Until now, we were relying on luck to ensure pages were zeroed.
However, now we properly zero pages in the kernel before handing them
off to userspace.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-17 11:35:38 +08:00
Sean Cross
85522602ea kernel: silence warnings and remove excess prints 
These prints were used to debug errors in the new process switching
architecture.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-16 19:03:10 +08:00
Sean Cross
022bedc8e3 kernel: refactor processes to support banking 
We now have a concept of context banking.  When an interrupt fires, the
process context is banked.

As part of this, process-level data is now stored in the page within the
process itself.  This reduces memory consumption and allows us to have
features such as a hash within each process itself.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-16 18:22:59 +08:00
Sean Cross
99d19866cf kernel: mem: zero out memory as part of alloc() 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 22:11:57 +08:00
Sean Cross
db87a94960 kernel: services: add a page for the queue 
Eventually this will be rolled into an existing page.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 22:06:22 +08:00
Sean Cross
77c07f0d79 mem: add map_page() 
This shortcut function ensures a page is mapped.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 22:06:00 +08:00
Sean Cross
9a10f50ce1 kernel: services: keep track of current pid 
Currently we use the ASID inside the MMU to figure out the current PID.
We should also keep track of what we think it is, for consistency.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 21:28:01 +08:00
Sean Cross
845cef3771 kernel: services: add servers to SYSTEM_SERVICES 
This array will be used to keep track of what servers are running.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 16:58:15 +08:00
Sean Cross
9508201db9 xous-rs: add claim_interrupt wrapper 
Rather than calling the raw function, add a wrapper for programs to use.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-14 15:41:44 +08:00
Sean Cross
7a3e038e6b syscall: add intial CreateServer call 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-13 22:41:25 +08:00
Sean Cross
c2008e5fe8 syscall: implement map_memory wrapper 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-13 20:33:08 +08:00
Sean Cross
08e416c776 kernel: support omitting virtual address when mapping 
This forms the basis for message passing.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-13 12:44:23 +08:00
Sean Cross
967464df93 kernel: mem: rename last memory address variable 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-13 09:52:53 +08:00
Sean Cross
fb3da7294c mem: turn function comment into rustdoc 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-13 08:32:44 +08:00
Sean Cross
4bb3f6db68 Merge branch 'master' of github.com:betrusted-io/xous-core 2020-03-13 08:30:55 +08:00
Sean Cross
f0d4e44254 kernel: processtable: add "last_default_address" 
This will be used to accelerate allocations for ranges.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-12 17:02:03 +08:00
Sean Cross
87676c0fc5 mem: start implementing find_virtual_address() 
Right now it just returns the address, which is exactly what we had
before.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-12 17:01:40 +08:00
Sean Cross
c1b575507d mem: better handling of memory alloc failures 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-12 16:51:14 +08:00
Sean Cross
36faa8354f riscv: mem: silence warnings when print-debug is disabled 
Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-12 16:50:55 +08:00
Sean Cross
09890a2ca3 riscv: use upstream riscv module 
Still pulling from git, as the version number hasn't been bumped yet.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-11 17:49:03 +08:00
Sean Cross
f50ec67553 initial commit 
This pulls together many disparate repositories into one xous-core
repository.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-10 12:13:05 +08:00