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211 commits

Author SHA1 Message Date
bunnie
eb0c1c4377 fix some hosted mode brokeness that came with pinning crates 
the rand api was downgraded to be in line with the ed25519 crate
which removed some "modern" conveniences. Small price to pay for
less code to review.
 2022-01-10 17:13:00 +08:00
bunnie
19f95e6bab fix kernel test build 2022-01-08 01:00:20 +08:00
bunnie
dd14dfc4c6 retrofit the seed into an atomicu64 so we can set it elsewhere 2021-12-27 02:49:08 +08:00
bunnie
0bd110c163 determinism achieved for testing. now to squash some bugs. 2021-12-26 01:50:30 +08:00
bunnie
66606ed3e0 initial attempt to make hosted mode more deterministic 
replace all threadRng with a seeded Rng
 2021-12-25 15:58:27 +08:00
Sean Cross
1ef4c0d87d kernel: mem: actually free unmapped pages 
Previously we would only free a page if it was valid. Now we
unconditionally free it.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-09-27 19:40:39 +08:00
Sean Cross
1cb86078d5 kernel: riscv: suspend or terminate processes that fail 
If a process fails for some reason (e.g. by performing a fault) and
there is no exception handler, either terminate the process or (if
gdbserver is enabled) have it suspend the process.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-25 16:02:11 +08:00
Sean Cross
19653e9c53 kernel: compatibility with riscv32imac-unknown-xous-elf 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-18 18:14:24 +08:00
Sean Cross
e44eec2334 kernel: fix remaining warnings on hosted mode 
This removes all remaining warnings from hosted mode. Tests pass, and
the system continues to run normally.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-16 15:07:25 +08:00
Sean Cross
90d1c7a4b8 kernel: move arch mods into their own dir 
Move `hosted.rs` into `hosted/mod.rs` and `riscv.rs` into
`riscv/mod.rs`.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-16 14:55:38 +08:00
Sean Cross
e29dc5a739 kernel: don't allow allocating exception thread 
This prevents the exception thread from being allocated as a normal
system thread.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-15 19:25:29 +08:00
Sean Cross
fa2a841f8a kernel: fix hosted mode exception support 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 17:51:24 +08:00
Sean Cross
6985fda7ba kernel: get exceptions fully working 
This finishes work with exceptions such that they now actually work.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 17:47:44 +08:00
Sean Cross
15c9eadc4c kernel: riscv: re-fix mem warnings 
The previous approach did not work, and broke everything. This fixes it
properly.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 13:02:16 +08:00
Sean Cross
68f5e81d3f kernel: riscv: fix warnings in process 
Fix clippy warnings in the `process.rs` file.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 12:54:43 +08:00
Sean Cross
dbd34318ce Revert "kernel: fix remaining clippy warnings" 
This appears to have broken things.

This reverts commit 8b0dd3630c.
 2021-08-06 12:51:40 +08:00
Sean Cross
8b0dd3630c kernel: fix remaining clippy warnings 
This removes all remaining clippy warnings from inside the kernel.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 11:43:34 +08:00
Sean Cross
cc8dc49dba kernel: riscv: refactor irqs to support exceptions 
This fixes the exception handler so that it can support user-defined
exceptions. Additionally, kernel mode errors are called out now.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 11:37:27 +08:00
Sean Cross
19f68edbb4 kernel: riscv: allow exceptions with NULL pc 
When the program counter is NULL, we can still get exceptions. This
happens when we jump to an invalid address, for example.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-06 11:34:50 +08:00
Sean Cross
b98e465d12 kernel: more clippy warning fixes 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-05 16:59:27 +08:00
Sean Cross
759ddfedd6 kernel: add initial cut of exception handling 
Though it is not yet wired up, the exception handler groundwork is laid
here.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-05 16:18:10 +08:00
Sean Cross
f5cf94524a kernel: add framework for exceptions 
Add the ability to invoke exception handlers. This is not yet properly
wired up, but the framework is there.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-08-02 11:04:47 +08:00
Sean Cross
4e17946960 kernel: riscv: ensure stack is 16-byte aligned 
Make sure processes are set up such that the stack is aligned to a
16-byte boundary.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-07-07 14:34:05 +08:00
Sean Cross
7b7be0fe9e hosted: fix MemoryRange refactor 
This fixes the MemoryRange refactor where `.addr` and `.size` are now
private fields.

Previously it had only been tested on baremetal mode.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-24 18:02:28 +08:00
Sean Cross
524df22667 kernel: riscv: ensure pages are writable when poking 
Ensure pages of memory can be written to when we write to them. This
lets us patch program code to, for example, insert breakpoints.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-21 20:22:45 +08:00
Sean Cross
86dd38f7fa kernel: fix hosted build 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-21 14:24:16 +08:00
Sean Cross
57b502e2c6 kernel: add gdb support to riscv 
This adds various primitives that can be used to attach a debugger to
the kernel.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-21 14:13:01 +08:00
Sean Cross
80860f0a51 Merge remote-tracking branch 'origin/main' into debugger 2021-06-21 13:22:51 +08:00
Sean Cross
fb839f3217 wip 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-16 16:53:40 +08:00
bunnie
a70b858812 convert to using the urandom interface 2021-06-11 16:29:25 +08:00
Sean Cross
651844ba20 Merge remote-tracking branch 'origin/master' into debugger 2021-06-06 19:21:18 +08:00
bunnie
bbfe0fb605 Merge remote-tracking branch 'betrusted/aes' into bunnie-dev 2021-06-02 14:49:11 +08:00
bunnie
fadc9c29ab Merge remote-tracking branch 'origin/master' into bunnie-dev 2021-06-02 03:59:25 +08:00
Sean Cross
bbda4365ae wip commit 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-06-01 17:57:01 +08:00
bunnie
2f9fa57bdd clock-gate based power management now seems to be more or less working 2021-05-31 23:14:35 +08:00
bunnie
d9e56fd321 very preliminary power savings working 2021-05-31 05:20:54 +08:00
bunnie
7c55925926 intermediate check-in on wfi 2021-05-30 23:07:16 +08:00
Sean Cross
be6e0a9895 kernel: fix thread termination and waiting 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-21 17:23:13 +08:00
Sean Cross
714aff830c kernel: implement JoinThread(tid) 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-21 16:32:38 +08:00
Sean Cross
7c2d3a2247 kernel: implement thread exit support 
Threads now have the ability to exit. Previously this resulted in a
kernel panic.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-21 13:04:14 +08:00
Sean Cross
e616a4bf4f kernel: fix hosted build/warnings 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-20 11:52:03 +08:00
Sean Cross
09b8242bb2 kernel: get process termination "working" on risc-v 
This successfully allows a process to call `terminate_process(val)`.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-20 11:42:31 +08:00
Sean Cross
6e57fbe29b kernel: riscv: make sure to flush mmu 
THe MMU flushing logic got disabled due to an experiment. Re-enable it
to ensure pages are consistent when shifting them across boundaries.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-19 20:55:45 +08:00
Sean Cross
47bf453325 kernel: riscv: use raw pointers for mmu mapping 
This avoids using uninitialized arrays to manage the pagetables, and
instead uses raw pointers. This should avoid using potentially
uninitialized data.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-19 14:17:53 +08:00
Sean Cross
30b82b25b1 kernel: run cargo fmt 
Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-19 14:12:01 +08:00
Sean Cross
ce66a6bde2 kernel: riscv: add exception const to mem 
The address of the exception page is now available for use as a standard
variable.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-10 14:37:33 +08:00
Sean Cross
5bd9e40ace kernel: riscv: add print_thread_* family 
These calls can be used to print out thread information for debugging.
This augments the existing `print_thread()` call, which has been renamed
to `print_current_thread()`.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-10 14:37:33 +08:00
bunnie
c0d72c282b increase process limit 2021-05-06 00:44:32 +08:00
Sean Cross
23e759ffd8 kernel: fix multi-page lending 
Due to several errors, multi-page lending did not work properly.

To begin with, if a page was not allocated then it would not be able to
be sent. That is, if you allocated 8192 bytes but only ever accessed the
first 4096 bytes, then an error would be encountered when lending the
unaccessed upper page.

Furthermore, due to a striding error in accessing pointers, half-pages
were treated as full pages.

Signed-off-by: Sean Cross <sean@xobs.io>
 2021-05-05 10:58:12 +08:00
bunnie
46fe3885dc cleanup more turds left over during the bringup of suspend/resume 2021-05-01 00:35:32 +08:00