Release 4.14 arch/blackfin/include/asm/entry.h
/*
* Copyright 2004-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef __BFIN_ENTRY_H
#define __BFIN_ENTRY_H
#include <asm/setup.h>
#include <asm/page.h>
#ifdef __ASSEMBLY__
#define LFLUSH_I_AND_D 0x00000808
#define LSIGTRAP 5
/*
* NOTE! The single-stepping code assumes that all interrupt handlers
* start by saving SYSCFG on the stack with their first instruction.
*/
/* This one is used for exceptions, emulation, and NMI. It doesn't push
RETI and doesn't do cli. */
#define SAVE_ALL_SYS save_context_no_interrupts
/* This is used for all normal interrupts. It saves a minimum of registers
to the stack, loads the IRQ number, and jumps to common code. */
#ifdef CONFIG_IPIPE
# define LOAD_IPIPE_IPEND \
P0.l = lo(IPEND); \
P0.h = hi(IPEND); \
R1 = [P0];
#else
# define LOAD_IPIPE_IPEND
#endif
/*
* Workaround for anomalies 05000283 and 05000315
*/
#if ANOMALY_05000283 || ANOMALY_05000315
# define ANOMALY_283_315_WORKAROUND(preg, dreg) \
cc = dreg == dreg; \
preg.h = HI(CHIPID); \
preg.l = LO(CHIPID); \
if cc jump 1f; \
dreg.l = W[preg]; \
1:
#else
# define ANOMALY_283_315_WORKAROUND(preg, dreg)
#endif /* ANOMALY_05000283 || ANOMALY_05000315 */
#ifndef CONFIG_EXACT_HWERR
/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
* otherwise it is a waste of cycles.
*/
# ifndef CONFIG_DEBUG_KERNEL
#define INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R0 = (N); \
LOAD_IPIPE_IPEND \
jump __common_int_entry;
# else /* CONFIG_DEBUG_KERNEL */
#define INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
p0.l = lo(IPEND); \
p0.h = hi(IPEND); \
r1 = [p0]; \
R0 = (N); \
LOAD_IPIPE_IPEND \
jump __common_int_entry;
# endif /* CONFIG_DEBUG_KERNEL */
/* For timer interrupts, we need to save IPEND, since the user_mode
*macro accesses it to determine where to account time.
*/
#define TIMER_INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
p0.l = lo(IPEND); \
p0.h = hi(IPEND); \
r1 = [p0]; \
R0 = (N); \
jump __common_int_entry;
#else /* CONFIG_EXACT_HWERR is defined */
/* if we want hardware error to be exact, we need to do a SSYNC (which forces
* read/writes to complete to the memory controllers), and check to see that
* caused a pending HW error condition. If so, we assume it was caused by user
* space, by setting the same interrupt that we are in (so it goes off again)
* and context restore, and a RTI (without servicing anything). This should
* cause the pending HWERR to fire, and when that is done, this interrupt will
* be re-serviced properly.
* As you can see by the code - we actually need to do two SSYNCS - one to
* make sure the read/writes complete, and another to make sure the hardware
* error is recognized by the core.
*
* The extra nop before the SSYNC is to make sure we work around 05000244,
* since the 283/315 workaround includes a branch to the end
*/
#define INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R1 = ASTAT; \
ANOMALY_283_315_WORKAROUND(p0, r0) \
P0.L = LO(ILAT); \
P0.H = HI(ILAT); \
NOP; \
SSYNC; \
SSYNC; \
R0 = [P0]; \
CC = BITTST(R0, EVT_IVHW_P); \
IF CC JUMP 1f; \
ASTAT = R1; \
p0.l = lo(IPEND); \
p0.h = hi(IPEND); \
r1 = [p0]; \
R0 = (N); \
LOAD_IPIPE_IPEND \
jump __common_int_entry; \
1: ASTAT = R1; \
RAISE N; \
(R7:0, P5:0) = [SP++]; \
SP += 0x8; \
SYSCFG = [SP++]; \
CSYNC; \
RTI;
#define TIMER_INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R1 = ASTAT; \
ANOMALY_283_315_WORKAROUND(p0, r0) \
P0.L = LO(ILAT); \
P0.H = HI(ILAT); \
NOP; \
SSYNC; \
SSYNC; \
R0 = [P0]; \
CC = BITTST(R0, EVT_IVHW_P); \
IF CC JUMP 1f; \
ASTAT = R1; \
p0.l = lo(IPEND); \
p0.h = hi(IPEND); \
r1 = [p0]; \
R0 = (N); \
jump __common_int_entry; \
1: ASTAT = R1; \
RAISE N; \
(R7:0, P5:0) = [SP++]; \
SP += 0x8; \
SYSCFG = [SP++]; \
CSYNC; \
RTI;
#endif /* CONFIG_EXACT_HWERR */
/* This one pushes RETI without using CLI. Interrupts are enabled. */
#define SAVE_CONTEXT_SYSCALL save_context_syscall
#define SAVE_CONTEXT save_context_with_interrupts
#define SAVE_CONTEXT_CPLB save_context_cplb
#define RESTORE_ALL_SYS restore_context_no_interrupts
#define RESTORE_CONTEXT restore_context_with_interrupts
#define RESTORE_CONTEXT_CPLB restore_context_cplb
#endif /* __ASSEMBLY__ */
#endif /* __BFIN_ENTRY_H */
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