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Add Cortex-M architecture HAL, STM32 variant and STM3210E platform HALs. Add STM32 serial driver and on-chip flash driver. Fix some compile problems with dlmalloc. See the various ChangeLogs for details.
author nickg
date Mon, 03 Nov 2008 14:53:50 +0000
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children 74dbf4c3f2e1
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2579:23e894d966a8 2580:07fc475e1c28
1 /*==========================================================================
2 //
3 // context.S
4 //
5 // Cortex-M context switch code
6 //
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 2008 eCosCentric Limited.
12 //
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later version.
16 //
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 // for more details.
21 //
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 //
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
32 //
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
35 // -------------------------------------------
36 //####ECOSGPLCOPYRIGHTEND####
37 //==========================================================================
38 //#####DESCRIPTIONBEGIN####
39 //
40 // Author(s): nickg
41 // Date: 2008-07-30
42 // Description: This file contains thread context switch code.
43 //
44 //####DESCRIPTIONEND####
45 //
46 //========================================================================*/
47
48 #include <pkgconf/system.h>
49 #include <pkgconf/hal.h>
50 #include <pkgconf/hal_cortexm.h>
51 #ifdef CYGPKG_KERNEL
52 #include <pkgconf/kernel.h>
53 #endif
54
55 //==========================================================================
56
57 .syntax unified
58 .thumb
59 .text
60
61 //==========================================================================
62 // Context switch
63 //
64 // R0 contains a pointer to the SP of the thread to load, R1 contains
65 // a pointer to the SP of the current thread.
66
67 .globl hal_thread_switch_context
68 .thumb
69 .thumb_func
70 .type hal_thread_switch_context, %function
71 hal_thread_switch_context:
72
73 push {r0-r12,lr} // Push all savable register
74 mov r2,#2 // Set state type == thread
75 mrs r3,basepri // Get priority base register
76 mov r4,sp // Get SP (for info only)
77 push {r2-r4} // Push them
78
79 str sp,[r1] // Save SP
80
81 // Fall through
82
83 //--------------------------------------------------------------------------
84 // Load context
85 //
86 // This is used to load a thread context, abandoning the current one. This
87 // function is also the second half of hal_thread_switch_context.
88
89 .globl hal_thread_load_context
90 .thumb
91 .thumb_func
92 .type hal_thread_load_context, %function
93 hal_thread_load_context:
94
95 ldr sp,[r0] // Load SP
96 pop {r2-r4} // Pop type, basepri and SP (discarded)
97 msr basepri,r3 // Set BASEPRI
98 pop {r0-r12,pc} // Pop all register and return
99
100 //==========================================================================
101 // HAL longjmp, setjmp implementations
102 //
103 // hal_setjmp saves only to callee save registers R4-14
104 // and LR into buffer supplied in r0[arg0].
105
106 .globl hal_setjmp
107 .thumb
108 .thumb_func
109 .type hal_setjmp, %function
110 hal_setjmp:
111 mov r3,sp
112 stmea r0,{r3-r12,r14}
113 mov r0,#0
114 bx lr
115
116 // hal_longjmp loads state from r0[arg0] and returns
117
118 .globl hal_longjmp
119 .thumb
120 .thumb_func
121 .type hal_longjmp, %function
122 hal_longjmp:
123 ldmfd r0,{r3-r12,r14}
124 mov sp,r3
125 mov r0,r1 // return [arg1]
126 bx lr
127
128 //==========================================================================
129 // EOF context.S