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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
//==========================================================================
//
// fpv4_sp_d16.c
//
// FPv4-SP-D16 support
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 2012 Free Software Foundation, Inc.
//
// eCos 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 2 or (at your option) any later
// version.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): ilijak
// Contributor(s):
// Date: 2012-05-30
//
//####DESCRIPTIONEND####
//
//========================================================================
#include <pkgconf/hal.h>
#include <pkgconf/hal_cortexm.h>
#include <cyg/infra/diag.h>
#include <cyg/infra/cyg_type.h>
#include <cyg/infra/cyg_trac.h> // tracing macros
#include <cyg/infra/cyg_ass.h> // assertion macros
#include <cyg/hal/hal_arch.h> // HAL header
#include <cyg/hal/hal_intr.h> // HAL header
#include <cyg/hal/cortexm_regs.h> // Special Cortex-M asm instructions
#include <cyg/hal/cortexm_fpu.h> // Optional Floating Point Unit
#define CYGARC_REG_NVIC_ACTLR (CYGARC_REG_NVIC_BASE + 0x008)
#define CYGARC_REG_NVIC_ACTLR_DISFCA BIT_(8)
//==========================================================================
// FPU is disbled upon reset. Dependent on FPU context switching model it
// may be enabled.
void hal_init_fpu(void)
{
cyg_uint32 regval;
// Initialize FPU according to context switch model.
// Disable FPU so we could access FPCCR
HAL_CORTEXM_FPU_DISABLE();
#if defined CYGARC_CORTEXM_FPU_EXC_AUTOSAVE
// Enable automatic exception FPU context saving.
HAL_READ_UINT32(CYGARC_REG_FPU_FPCCR, regval);
regval |= CYGARC_REG_FPU_FPCCR_LSPEN | CYGARC_REG_FPU_FPCCR_ASPEN;
HAL_WRITE_UINT32(CYGARC_REG_FPU_FPCCR, regval);
HAL_MEMORY_BARRIER();
#else
// Disable automatic exception FPU context saving.
CYGARC_MRS(regval, control);
regval &= ~CYGARC_REG_CONTROL_FPCA_M;
CYGARC_MSR(control, regval);
HAL_READ_UINT32(CYGARC_REG_FPU_FPCCR, regval);
regval &= ~(CYGARC_REG_FPU_FPCCR_LSPEN | CYGARC_REG_FPU_FPCCR_ASPEN);
HAL_WRITE_UINT32(CYGARC_REG_FPU_FPCCR, regval);
HAL_MEMORY_BARRIER();
#endif
#if defined CYGHWR_HAL_CORTEXM_FPU_SWITCH_NONE || \
defined CYGHWR_HAL_CORTEXM_FPU_SWITCH_ALL
// Enable FPU
HAL_CORTEXM_FPU_ENABLE();
CYGARC_VMSR(fpscr, 0);
#endif
}
//==========================================================================
// EOF fpv4_sp_d16.c
|
