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Pause syscall and int 0xee interrupt syscalls

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The syscall/sysret instructions don't swap stacks. This was bad but
passable until syscalls caused the scheduler to run, and scheduling a
task that paused due to interrupt.

Adding a new (hopefully temporary) syscall interrupt `int 0xee` to allow
me to test syscalls without stack issues before I tackle the
syscall/sysret issue.

Also implemented a basic `pause` syscall that causes the calling process
to become unready. Because nothing can wake a process yet, it never
returns.
This commit is contained in:
Justin C. Miller
2018-09-12 20:59:08 -07:00
parent c2f85ce61b
commit 62c559043d
13 changed files with 233 additions and 136 deletions
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11
src/kernel/interrupt_isrs.inc
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@@ -237,12 +237,13 @@ IRQ (0xde, 0xbe, irqBE)
IRQ (0xdf, 0xbf, irqBF)
ISR (0xe7, isrAssert)
ISR (0xe0, isrTimer)
ISR (0xe1, isrLINT0)
ISR (0xe2, isrLINT1)
ISR (0xe3, isrSpurious)
ISR (0xe4, isrAssert)
ISR (0xec, isrTimer)
ISR (0xed, isrLINT0)
ISR (0xee, isrLINT1)
ISR (0xef, isrSpurious)
UISR(0xee, isrSyscall)
ISR (0xf0, isrIgnore0)
ISR (0xf1, isrIgnore1)