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ARC: add support for DSP-enabled userspace applications

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To be able to run DSP-enabled userspace applications we need to
save and restore following DSP-related registers:
At IRQ/exception entry/exit:
 * DSP_CTRL (save it and reset to value suitable for kernel)
 * ACC0_LO, ACC0_HI (we already save them as r58, r59 pair)
At context switch:
 * ACC0_GLO, ACC0_GHI
 * DSP_BFLY0, DSP_FFT_CTRL

Reviewed-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Eugeniy Paltsev 2020-03-05 23:02:51 +03:00 • committed by Vineet Gupta
parent 4827d0cf74
commit 7321e2ea0d
9 changed files with 127 additions and 1 deletions
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74
arch/arc/include/asm/dsp-impl.h
View file

@ -7,6 +7,8 @@
#ifndef __ASM_ARC_DSP_IMPL_H
#define __ASM_ARC_DSP_IMPL_H
#include <asm/dsp.h>
#define DSP_CTRL_DISABLED_ALL 0
#ifdef __ASSEMBLY__
@ -30,12 +32,82 @@
*/
mov r10, DSP_CTRL_DISABLED_ALL
sr r10, [ARC_AUX_DSP_CTRL]
#endif /* ARC_DSP_KERNEL */
#elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
/*
* Save DSP_CTRL register and reset it to value suitable for kernel
* (DSP_CTRL_DISABLED_ALL)
*/
mov r10, DSP_CTRL_DISABLED_ALL
aex r10, [ARC_AUX_DSP_CTRL]
st r10, [sp, PT_DSP_CTRL]
#endif
.endm
/* clobbers r10, r11 registers pair */
.macro DSP_RESTORE_REGFILE_IRQ
#if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)
ld r10, [sp, PT_DSP_CTRL]
sr r10, [ARC_AUX_DSP_CTRL]
#endif
.endm
#else /* __ASEMBLY__ */
#include <linux/sched.h>
#include <asm/asserts.h>
#include <asm/switch_to.h>
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
/*
* As we save new and restore old AUX register value in the same place we
* can optimize a bit and use AEX instruction (swap contents of an auxiliary
* register with a core register) instead of LR + SR pair.
*/
#define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux) \
do { \
long unsigned int _scratch; \
\
__asm__ __volatile__( \
"ld %0, [%2, %4] \n" \
"aex %0, [%3] \n" \
"st %0, [%1, %4] \n" \
: \
"=&r" (_scratch) /* must be early clobber */ \
: \
"r" (_saveto), \
"r" (_readfrom), \
"Ir" (_aux), \
"Ir" (_offt) \
: \
"memory" \
); \
} while (0)
#define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux) \
AUX_SAVE_RESTORE(_saveto, _readfrom, \
offsetof(struct dsp_callee_regs, _aux), \
ARC_AUX_##_aux)
static inline void dsp_save_restore(struct task_struct *prev,
struct task_struct *next)
{
long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO;
long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO;
DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO);
DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI);
DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0);
DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL);
}
#else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
#define dsp_save_restore(p, n)
#endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */
static inline bool dsp_exist(void)
{