diff options
Diffstat (limited to 'src/hram.asm')
| -rw-r--r-- | src/hram.asm | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/hram.asm b/src/hram.asm index 7c1910c..9e65982 100644 --- a/src/hram.asm +++ b/src/hram.asm @@ -31,6 +31,9 @@ LOAD "hram_code", HRAM ; Runs from HRAM. Saves/restores full context. Clobbers everything. ; --------------------------------------------------------------------------- hSwitchTo:: + di ; no tick ISR while SP and the banks under it + ; are out of sync (pushes would hit the wrong + ; bank); ei below once the incoming stack is up ; stash target while DE is still valid ld a, e ld [hSwitchTgt], a @@ -114,6 +117,8 @@ hSwitchTo:: ld sp, hl ; --- pop incoming context and resume it --- + ei ; SP + banks consistent again (takes effect + ; after the next instruction) pop hl pop de pop bc |