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; ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
;
; This file is part of ChibiOS/RT.
;
; ChibiOS/RT is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 3 of the License, or
; (at your option) any later version.
; ChibiOS/RT is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; You should have received a copy of the GNU General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
?PR??_THREAD_START?CHCOREASM SEGMENT CODE
RSEG ?PR??_THREAD_START?CHCOREASM
EXTRN PAGE0(rlist)
; Performs a context switch between two threads.
; In this port swapping the stack pointers is enough, there are
; no registers to be preserved across function calls and the
; program counter is already in the stack.
PUBLIC ?_port_switch
?_port_switch:
LDW Y,SP
LDW (005H,X),Y ; SP saved in otp->p_ctx.sp
; LDW X,(003H,SP) ; ntp
LDW X,rlist + 0DH ; rlist.r_current (currp)
LDW X,(005H,X)
LDW SP,X ; SP restored from currp->p_ctx.sp
RET
PUBLIC ?_port_thread_start
?_port_thread_start:
RIM
POPW X
RET
end
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