diff options
| author | Ian Moffett <ian@osmora.org> | 2025-10-08 20:41:36 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-10-08 20:47:22 -0400 |
| commit | 51fa2005fe360a9e24ff4fbe43be47eb00d2d67c (patch) | |
| tree | a30c607d47a183123def45fa5f1125f2c1466c66 /src/sys/arch/amd64/cpu/vector.S | |
| parent | c34cb71206e00f288821027c9b11d62d4fe75d2e (diff) | |
kernel/amd64: cpu: Implement 'ioapic_common' stub
This implementation walks through the entire table of registered
interrupt handlers and calls each driver handler.
The driver is to return a value of 1 if the interrupt is theirs and has
been handled, otherwise it is to return 0. The handling core is to
respoond to a 1 by exiting the table walk early, and responds to a 0 by
continuing.
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'src/sys/arch/amd64/cpu/vector.S')
| -rw-r--r-- | src/sys/arch/amd64/cpu/vector.S | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/sys/arch/amd64/cpu/vector.S b/src/sys/arch/amd64/cpu/vector.S index 9969956..545a08d 100644 --- a/src/sys/arch/amd64/cpu/vector.S +++ b/src/sys/arch/amd64/cpu/vector.S @@ -112,10 +112,33 @@ irq_init_pins: IDT_SET_VEC 100, ioapic_edge_63 retq -/* XXX: STUB */ ioapic_common: + xor %rcx, %rcx // Start at zero +.walk: // Begin the table walk + lea g_intrs(%rip), %rbx // BASE -> RBX + lea (%rbx, %rcx, 8), %rbx // RBX+RCX*8 -> RBX + mov (%rbx), %rdx // *RBX -> RDX + or %rdx, %rdx // Is it NULL? + jz 1f // Yes + + mov (%rdx), %rbx // Get the handler + or %rbx, %rbx // Can we use this handler? + jz 1f // No, continue on + push %rcx // Save RCX between CALLs + call *%rbx // Indirect call + pop %rcx // We need RCX back now + + cmp $0, %rax // Do we continue? (not handled) + jg done // Nope, handled + +1: inc %rcx // Bump up RCX, next idx + cmp $256, %rcx // Are we through every? + jl .walk // Nope, continue +done: // End of loop + call lapic_eoi // Signal end of interrupt retq + INTR_ENTRY(ioapic_edge_0) call ioapic_common INTR_EXIT(ioapic_edge_0) |