[BSP] Enable VFP.

committed by FH.

libcpu/arm/armv6/arm_entry_gcc.S

@@ -130,13 +130,8 @@ __check_vfp_instruction:
 	mov pc,	lr				@ CP7
 	mov pc,	lr				@ CP8
 	mov pc,	lr				@ CP9
-#ifdef RT_USING_VFP
-	b	vfp_entry			@ CP10 VFP
-	b	vfp_entry			@ CP11 VFP
-#else
 	mov pc,	lr				@ CP10 VFP
 	mov pc,	lr				@ CP11 VFP
-#endif
 	mov pc,	lr				@ CP12
 	mov pc,	lr				@ CP13
 	mov pc,	lr				@ CP14 DEBUG

libcpu/arm/armv6/context_gcc.S

@@ -70,12 +70,6 @@ rt_hw_context_switch:
 
     ldmfd sp!, {r4}         @ pop new task cpsr to spsr
     msr spsr_cxsf, r4
-#ifdef RT_USING_VFP
-    vmrs    r0, fpexc
-    bic     r0, r0, #FPEXC_EN    @ always disable VFP so we can 
-                                 @ lazily save/restore the old state.
-    vmsr    fpexc, r0
-#endif
 _do_switch:
     ldmfd sp!, {r0-r12, lr, pc}^  @ pop new task r0-r12, lr & pc, copy spsr to cpsr
 
@@ -92,12 +86,6 @@ rt_hw_context_switch_to:
 
     bic r4, r4, #0x20       @ must be ARM mode
     msr cpsr_cxsf, r4
-#ifdef RT_USING_VFP
-    vmrs    r0, fpexc
-    bic     r0, r0, #FPEXC_EN    @ always disable VFP so we can 
-                                 @ lazily save/restore the old state.
-    vmsr    fpexc, r0
-#endif
     ldmfd sp!, {r0-r12, lr, pc}^   @ pop new task r0-r12, lr & pc
 
 /*

libcpu/arm/armv6/vfp.c

-/*
- * 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