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/*
* File : vfp.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Develop Team
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2014-11-07 weety first version
*/
#include <rthw.h>
#include <rtthread.h>
#include "vfp.h"
#ifdef RT_USING_VFP
rt_uint32_t vfpregs_offset = offsetof(struct rt_thread, vfpregs);
struct vfp_context *last_vfp_context = RT_NULL;
int vfp_switch(rt_uint32_t cmd, struct rt_thread *thread)
{
rt_uint32_t fpexc;
//rt_kprintf("%s:%d, %x\n", __func__, cmd, thread);
switch (cmd) {
case THREAD_INIT:
{
struct vfp_context *vfp = &thread->vfpregs;
rt_memset(vfp, 0, sizeof(struct vfp_context));
vfp->fpexc = FPEXC_EN;
vfp->fpscr = FPSCR_RN;
if (last_vfp_context == vfp)
last_vfp_context = RT_NULL;
vmsr(FPEXC, vmrs(FPEXC) & ~FPEXC_EN);
break;
}
case THREAD_EXIT:
{
/* release case: Per-thread VFP cleanup. */
struct vfp_context *vfp = &thread->vfpregs;
if (last_vfp_context == vfp)
last_vfp_context = RT_NULL;
break;
}
default:
break;
}
return 0;
}
int vfp_thread_init(struct rt_thread *thread)
{
return vfp_switch(THREAD_INIT, thread);
}
int vfp_thread_exit(struct rt_thread *thread)
{
return vfp_switch(THREAD_EXIT, thread);
}
rt_uint32_t read_vfp_regs(rt_uint32_t *buf)
{
rt_uint32_t value;
rt_uint32_t length;
asm volatile ("vldmia %0!, {d0-d15}"
:
:"r"(buf)
:"cc");
length = 32;
#ifdef RT_USING_VFPv3
asm volatile ("vmrs %0, mvfr0"
:"=r"(value)
:);
if ((value & MVFR0_A_SIMD_MASK) == 2)
{
asm volatile ("vldmia %0!, {d16-d31}"
:
:"r"(buf)
:"cc");
length = 64;
}
else
{
length = 32;
}
#endif
return length;
}
void vfp_exception(rt_uint32_t instruction, rt_uint32_t fpexc)
{
int i = 0;
int length = 0;
rt_uint32_t fpscr, fpsid;
#ifdef RT_USING_VFPv3
unsigned long long vfp_regs[32];
#else
unsigned long long vfp_regs[16];
#endif
rt_kprintf("VFP: exception: instruction %08x fpexc %08x\n", instruction, fpexc);
fpsid = vmrs(FPSID);
fpscr = vmrs(FPSCR);
rt_kprintf("VFP: exception: fpsid %08x fpscr %08x\n", fpsid, fpscr);
length = read_vfp_regs((rt_uint32_t *)vfp_regs);
rt_kprintf("VFP: exception registers: {s0~s%d}\n", length - 1);
for(i = 0; i < length; i++)
{
if (i && !(i & 0x3))
rt_kprintf("\n");
rt_kprintf("0x%08x ", ((rt_uint32_t *)vfp_regs)[i]);
}
rt_kprintf("\n");
}
void vfp_init(void)
{
int ret = 0;
unsigned int value;
asm volatile ("mrc p15, 0, %0, c1, c0, 2"
:"=r"(value)
:);
value |= 0xf00000;/*enable CP10, CP11 user access*/
asm volatile("mcr p15, 0, %0, c1, c0, 2"
:
:"r"(value));
#if 0
asm volatile("fmrx %0, fpexc"
:"=r"(value));
value |=(1<<30);
asm volatile("fmxr fpexc, %0"
:
:"r"(value));
#endif
}
#endif
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