1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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/>.
*/
/**
* @file RC/STM8/chcore.c
* @brief STM8 architecture port code.
*
* @addtogroup STM8_CORE
* @{
*/
#pragma SRC("tmp.asm")
#include "ch.h"
/**
* @brief Performs a context switch between two threads.
*
* @param otp the thread to be switched out
*/
void _port_switch(Thread *otp) {
(void)otp;
/* Asm because unoptimal code would generated by using _getSP_().*/
#pragma ASM
EXTRN PAGE0(rlist)
LDW Y,SP ; old context pointer
LDW (005H,X),Y ; SP saved in otp->p_ctx.sp
LDW X,rlist + 0DH ; r_current (currp) field
LDW X,(005H,X) ; currp->p_ctx.sp
LDW SP,X ; new context pointer
#pragma ENDASM
}
/**
* @brief Thread start code.
*/
void _port_thread_start(void) {
#pragma ASM
RIM
POPW X
#pragma ENDASM
}
/**
* @brief Halts the system.
* @details This function is invoked by the operating system when an
* unrecoverable error is detected (as example because a programming
* error in the application code that triggers an assertion while in
* debug mode).
*/
void port_halt(void) {
port_disable();
while (TRUE) {
}
}
/** @} */
|