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Kernel/aarch64: Add implementation of Processor::switch_context

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This initial implementation makes it possible to actually context switch
between different kernel threads! :^)
This commit is contained in:
Timon Kruiper 2022-12-27 21:13:31 +01:00 • committed by Andrew Kaster
parent 0b95d8cd24
commit a5e98d3644
2 changed files with 107 additions and 5 deletions
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6
Kernel/Arch/aarch64/vector_table.S
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@ -60,8 +60,6 @@
str x0, [sp, #ELR_EL1_SLOT]
mrs x0, tpidr_el0
str x0, [sp, #TPIDR_EL0_SLOT]
mrs x0, sp_el0
str x0, [sp, #SP_EL0_SLOT]
// Set up TrapFrame struct on the stack
sub sp, sp, #16
@ -168,6 +166,10 @@ synchronous_current_elsp_el0:
eret
irq_current_elsp_el0:
// An IRQ will always switch the stack pointer to SP_EL1, however we want to use SP_EL0, so switch
// to SP_EL0. This means that the stack of the currently executing thread is used as the irq stack.
msr SPSel, #0
save_current_context
bl handle_interrupt
restore_previous_context