I hadn't noticed this before, but you can directly reference a global
variable in a load/store in assembly, which combines a lla + ld/sd into
a 2 instruction pair instead of 3 due to the 12 bit offset provided in
the load/store.
This fixes a problem if the text segment gets larger than ~1MB where the
raw jal instruction cannot reach. Using 'call' or 'tail' allows the
assembler to emit a 2 instruction sequence that the linker later
relaxes if it can.
When dropping from EL2 (or EL3), load vmpidr_el2 and vpidr_el2 with the
correct values to make sure EL1 sees the 'real' mpidr_el1 and midr_el1.
Though in most cases they're already configured by whatever firmware ran
before, there's no actual guarantee that it is, and it may be full of
random garbage.
This change introduces $LK_ROOT/toolchain as an official installation
directory for toolchains, as well as a new script for conveniently
installing them there (versus manual GETs + untarring).
getting_started.md is updated to suggest its use.
On mac qemu, trying to use the physical timer does not seem to work, but
really the virtual timer is what you should be using most of the time,
especially when running under emulation.
This change updates the `help` console command to list the available
commands alphabetically, but only when we're not panicking. This makes
`help`'s helping more helpful.
Move common logic into a default routine in platform/power that other
platforms can reuse to implement the general default shutdown logic.
Add helper routines to print the cause.
Refactor the platforms that had substantial halt logic to reuse the
default implementation.
Initialize the uart by passing in the base and irq, as well as a flag
specifying if it's the debug uart and should directly put data into the
console buffer (if present).
Remove clang-13 from the build list, since it's not present in ubuntu
24.04.
If someone thinks this is an issue, please drop an email and we can see
about adding it back.
This change updates lk.code-workspace to specify
* editor.detectIndentation as false, as otherwise that overrides
the desired editor.tabSize setting.
* editor.insertSpaces as true, since spaces are preferred over tabs.
* editor.formatOnSave as false for C and C++ files, as - in the absence
of a .clang-format file - the clangd extension is likely to default to
choices that don't respect the local style.
Though using the named nmemonics is a generally better idea it has the
unforunate property of not working on older compilers. In this case,
these new registers are for the Sstic extension, which is new enough
that even reasonably recent compilers as GCC 12.1 doesn't understand it.
Fixes issue #410
