sam: optimize kernel return path a tiny bit

diff --git a/Kernel/platform-sam/sam.s b/Kernel/platform-sam/sam.s
index e5fb77d..dc55b94 100644 (file)
--- a/Kernel/platform-sam/sam.s
+++ b/Kernel/platform-sam/sam.s
@@ -151,6 +151,9 @@ low_save:
            .db 0
 video_save:
            .db 0
+entry_low:
+           .db 0       ; Holds the low bank value on IRQ entry, Used so
+                       ; we can save and restore temporary kernel mappings
 
 map_save_low:
            push af
@@ -361,9 +364,8 @@ interrupt_high:
            ; On return HL = signal vector E= signal (if any) A = page for
            ; high
            or a
-           jr nz, touser
-           ld a,#KERNEL_HIGH
-touser:
+           jr z, kernout
+           ; Returning to user space
            ld d,a
            in a,(251)
            and #0x60
@@ -375,6 +377,7 @@ touser:
            xor a
            cp e
            call nz, sigpath
+kernout:
            pop hl
            pop de
            pop af