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10 Commits

Author SHA1 Message Date
Nico Weber
bc213ad7a2 Kernel: Add a Timer class for aarch64 
For now, this can only query microseconds since boot.

Use this to print a timestamp every second. This busy-loops
until a second has passed. This might be a good first use of
interrupts soon.

qemu used to not implement this timer at some point, but
it seems to work fine even in qemu now (qemu v 5.2.0).
 2021-10-02 21:23:28 +01:00
Nico Weber
54aabb07f9 Kernel: Add UART class for aarch64 2021-09-26 23:14:01 +00:00
Nico Weber
fdc86ddae5 Kernel: Add a GPIO class for aarch64 
This allows configuring the alternate pin functions and pin
pull up/down states, which is needed for using the UART.
 2021-09-26 11:55:51 +02:00
Nico Weber
697e6ccb89 Kernel: Add a Mailbox class for aarch64 
As a demo, query the firmware version. `Meta/serenity.sh gdb aarch64`
can be used to observe that qemu puts 0x548E1 in x0 in response
to this mailbox message.
 2021-09-19 17:45:59 +02:00
Nico Weber
d0b9c7a20b Kernel: Add a MMIO class for aarch64 
It doesn't do anything yet except figure out the peripheral base
address.

Very likely belongs in Kernel, not Prekernel, eventually.
 2021-09-19 17:45:59 +02:00
Nico Weber
3a24eb323f Kernel: Use new halt() for all our halting needs in aarch64 Prekernel 2021-09-19 17:45:59 +02:00
Nico Weber
0319aa315a Kernel: Add __stack_chk_fail to aarch64 Prekernel init 
This is needed for some functions with local variables. We'll grow
such a function soon.
 2021-09-19 17:45:59 +02:00
Nico Weber
3c6ad4c7db Kernel: Add a class to wrap aarch64 MIDR_EL1 
We'll need part_num() to determine the MMIO address base. It's
0x3F000000 on rpi3 but 0xFE000000 on rpi4.
 2021-09-12 17:26:41 +00:00
Nico Weber
18dcd7b9c9 Kernel: Define __stack_chk_guard for aarch64 Prekernel 
Needed for functions that have local variables.

In time we need to share this between aarch64 and intel, but while
we figure out what exactly the aarch64 Prekernel should do, let's
duplicate this.
 2021-09-12 17:26:41 +00:00
Nico Weber
62bc238ac3 Kernel: Let aarch64 port call into C++ 
Put all but the first core into a loop, make room for some stack,
and call init().
 2021-09-06 21:57:59 +01:00