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[libcpu][c28x]add support for c28x mcu hardware fpu

This commit is contained in:
Xiao Lifan 2019-12-05 21:50:48 +08:00
parent 0dc7da688f
commit 01b27b9e91
2 changed files with 56 additions and 1 deletions
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38
libcpu/ti-dsp/c28x/context.s
View File

@ -8,6 +8,7 @@
; 2018-09-01 xuzhuoyi the first version.
; 2019-06-17 zhaoxiaowei fix bugs of old c28x interrupt api.
; 2019-07-03 zhaoxiaowei add _rt_hw_calc_csb function to support __rt_ffs.
; 2019-12-05 xiaolifan add support for hardware fpu32
;
.ref _rt_interrupt_to_thread
@ -24,6 +25,16 @@
.def _rt_hw_interrupt_thread_switch
.def _rt_hw_interrupt_disable
.def _rt_hw_interrupt_enable
;workaround for importing fpu settings from the compiler
.cdecls C,NOLIST
%{
#ifdef __TMS320C28XX_FPU32__
#define __FPU32__ 1
#else
#define __FPU32__ 0
#endif
%}
RT_CTX_SAVE .macro
@ -38,12 +49,37 @@ RT_CTX_SAVE .macro
PUSH XAR7
PUSH XT
PUSH RPC
.if __FPU32__
PUSH RB
MOV32 *SP++, STF
MOV32 *SP++, R0H
MOV32 *SP++, R1H
MOV32 *SP++, R2H
MOV32 *SP++, R3H
MOV32 *SP++, R4H
MOV32 *SP++, R5H
MOV32 *SP++, R6H
MOV32 *SP++, R7H
.endif
.endm
RT_CTX_RESTORE .macro
.if __FPU32__
MOV32 R7H, *--SP, UNCF
MOV32 R6H, *--SP, UNCF
MOV32 R5H, *--SP, UNCF
MOV32 R4H, *--SP, UNCF
MOV32 R3H, *--SP, UNCF
MOV32 R2H, *--SP, UNCF
MOV32 R1H, *--SP, UNCF
MOV32 R0H, *--SP, UNCF
MOV32 STF, *--SP
POP RB
.endif
POP RPC
POP XT

19
libcpu/ti-dsp/c28x/cpuport.c
View File

@ -7,6 +7,7 @@
* Date Author Notes
* 2018-09-01 xuzhuoyi the first version.
* 2019-07-03 zhaoxiaowei add support for __rt_ffs.
* 2019-12-05 xiaolifan add support for hardware fpu32
*/
#include <rtthread.h>
@ -22,6 +23,7 @@ extern rt_uint16_t rt_hw_get_st0(void);
extern rt_uint16_t rt_hw_get_st1(void);
extern int rt_hw_calc_csb(int value);
struct exception_stack_frame
{
rt_uint32_t t_st0;
@ -49,6 +51,18 @@ struct stack_frame
rt_uint32_t xt;
rt_uint32_t rpc;
#ifdef __TMS320C28XX_FPU32__
rt_uint32_t rb;
rt_uint32_t stf;
rt_uint32_t r0h;
rt_uint32_t r1h;
rt_uint32_t r2h;
rt_uint32_t r3h;
rt_uint32_t r4h;
rt_uint32_t r5h;
rt_uint32_t r6h;
rt_uint32_t r7h;
#endif
};
@ -83,6 +97,11 @@ rt_uint8_t *rt_hw_stack_init(void *tentry,
stack_frame->exception_stack_frame.return_address = (unsigned long)tentry; /* return_address */
stack_frame->rpc = (unsigned long)texit;
#ifdef __TMS320C28XX_FPU32__
stack_frame->stf = 0x00000200;
stack_frame->rb = 0;
#endif
/* return task's current stack address */
return stk + sizeof(struct stack_frame);
}