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[kernel] Use IST for kernel stacks for NMI, #DF, #PF

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We started actually running up against the page boundary for kernel
stacks and thus double-faulting on page faults from kernel space. So I
finally added IST stacks. Note that we currently just
increment/decrement the IST entry by a page when we enter the handler to
avoid clobbering on re-entry, but this means:

* these handlers need to be able to operate with only a page of stack
* kernel stacks always have to be >1 pages
* the amount of nesting possible is tied to the kernel stack size.

These seem fine for now, but we should maybe find a way to use something
besides g_kernel_stacks to set up the IST stacks if/when this becomes an
issue.
This commit is contained in:
Justin C. Miller
2021-02-02 18:27:37 -08:00
parent 8575939b20
commit 68a2250886
8 changed files with 166 additions and 87 deletions
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5
src/kernel/interrupts.s
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@@ -53,9 +53,8 @@ isr_handler_return:
jmp irq_handler_prelude
%endmacro
%define EISR(i, name) EMIT_EISR name, i ; ISR with error code
%define UISR(i, name) EMIT_ISR name, i ; ISR callable from user space
%define ISR(i, name) EMIT_ISR name, i
%define EISR(i, s, name) EMIT_EISR name, i ; ISR with error code
%define ISR(i, s, name) EMIT_ISR name, i
%define IRQ(i, q, name) EMIT_IRQ name, i
section .isrs