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nds32: Enable FPU if the version of CPU supported 

Some version of Andes core support FPU coprocessor,
if this is the case, and toolchain support FPU instruction set,
we should enable it at low level initialization time.

Signed-off-by: Kuan-Yu Kuo <ken.kuoky@gmail.com>
Cc: Macpaul Lin <macpaul@gmail.com>
This commit is contained in:
ken kuo 2013-07-25 02:17:11 +08:00 committed by Macpaul Lin
parent 99ca91b6d7
commit c54fd3efa4
2 changed files with 52 additions and 0 deletions
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26
arch/nds32/cpu/n1213/ag101/lowlevel_init.S
View File

@ -98,6 +98,11 @@ lowlevel_init:
led 0x10
jal remap
#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
led 0x1f
jal enable_fpu
#endif
led 0x20
ret $r10
@ -234,6 +239,27 @@ relo_base:
2:
ret
/*
* enable_fpu:
* Some of Andes CPU version support FPU coprocessor, if so,
* and toolchain support FPU instruction set, we should enable it.
*/
#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
enable_fpu:
mfsr $r0, $CPU_VER /* enable FPU if it exists */
srli $r0, $r0, 3
andi $r0, $r0, 1
beqz $r0, 1f /* skip if no COP */
mfsr $r0, $FUCOP_EXIST
srli $r0, $r0, 31
beqz $r0, 1f /* skip if no FPU */
mfsr $r0, $FUCOP_CTL
ori $r0, $r0, 1
mtsr $r0, $FUCOP_CTL
1:
ret
#endif
.globl show_led
show_led:
li $r8, (CONFIG_DEBUG_LED)

26
arch/nds32/cpu/n1213/ag102/lowlevel_init.S
View File

@ -114,6 +114,11 @@ lowlevel_init:
led 0x20
jal remap
#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
led 0x2f
jal enable_fpu
#endif
led 0x30
ret $r10
@ -289,6 +294,27 @@ relo_base:
2:
ret
/*
* enable_fpu:
* Some of Andes CPU version support FPU coprocessor, if so,
* and toolchain support FPU instruction set, we should enable it.
*/
#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
enable_fpu:
mfsr $r0, $CPU_VER /* enable FPU if it exists */
srli $r0, $r0, 3
andi $r0, $r0, 1
beqz $r0, 1f /* skip if no COP */
mfsr $r0, $FUCOP_EXIST
srli $r0, $r0, 31
beqz $r0, 1f /* skip if no FPU */
mfsr $r0, $FUCOP_CTL
ori $r0, $r0, 1
mtsr $r0, $FUCOP_CTL
1:
ret
#endif
.globl show_led
show_led:
li $r8, (CONFIG_DEBUG_LED)