67ddb4052d
Create generic kernel debugger hooks in the MN10300 arch and make gdbstub use them. This is a preparation for KGDB support. Signed-off-by: David Howells <dhowells@redhat.com>
216 lines
4 KiB
C
216 lines
4 KiB
C
/* MN10300 IRQ flag handling
|
|
*
|
|
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_IRQFLAGS_H
|
|
#define _ASM_IRQFLAGS_H
|
|
|
|
#include <asm/cpu-regs.h>
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/smp.h>
|
|
#endif
|
|
|
|
/*
|
|
* interrupt control
|
|
* - "disabled": run in IM1/2
|
|
* - level 0 - kernel debugger
|
|
* - level 1 - virtual serial DMA (if present)
|
|
* - level 5 - normal interrupt priority
|
|
* - level 6 - timer interrupt
|
|
* - "enabled": run in IM7
|
|
*/
|
|
#define MN10300_CLI_LEVEL (CONFIG_LINUX_CLI_LEVEL << EPSW_IM_SHIFT)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
static inline unsigned long arch_local_save_flags(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
asm volatile("mov epsw,%0" : "=d"(flags));
|
|
return flags;
|
|
}
|
|
|
|
static inline void arch_local_irq_disable(void)
|
|
{
|
|
asm volatile(
|
|
" and %0,epsw \n"
|
|
" or %1,epsw \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
:
|
|
: "i"(~EPSW_IM), "i"(EPSW_IE | MN10300_CLI_LEVEL)
|
|
: "memory");
|
|
}
|
|
|
|
static inline unsigned long arch_local_irq_save(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
flags = arch_local_save_flags();
|
|
arch_local_irq_disable();
|
|
return flags;
|
|
}
|
|
|
|
/*
|
|
* we make sure arch_irq_enable() doesn't cause priority inversion
|
|
*/
|
|
extern unsigned long __mn10300_irq_enabled_epsw[];
|
|
|
|
static inline void arch_local_irq_enable(void)
|
|
{
|
|
unsigned long tmp;
|
|
int cpu = raw_smp_processor_id();
|
|
|
|
asm volatile(
|
|
" mov epsw,%0 \n"
|
|
" and %1,%0 \n"
|
|
" or %2,%0 \n"
|
|
" mov %0,epsw \n"
|
|
: "=&d"(tmp)
|
|
: "i"(~EPSW_IM), "r"(__mn10300_irq_enabled_epsw[cpu])
|
|
: "memory", "cc");
|
|
}
|
|
|
|
static inline void arch_local_irq_restore(unsigned long flags)
|
|
{
|
|
asm volatile(
|
|
" mov %0,epsw \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
:
|
|
: "d"(flags)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
static inline bool arch_irqs_disabled_flags(unsigned long flags)
|
|
{
|
|
return (flags & (EPSW_IE | EPSW_IM)) != (EPSW_IE | EPSW_IM_7);
|
|
}
|
|
|
|
static inline bool arch_irqs_disabled(void)
|
|
{
|
|
return arch_irqs_disabled_flags(arch_local_save_flags());
|
|
}
|
|
|
|
/*
|
|
* Hook to save power by halting the CPU
|
|
* - called from the idle loop
|
|
* - must reenable interrupts (which takes three instruction cycles to complete)
|
|
*/
|
|
static inline void arch_safe_halt(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
arch_local_irq_enable();
|
|
#else
|
|
asm volatile(
|
|
" or %0,epsw \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
" bset %2,(%1) \n"
|
|
:
|
|
: "i"(EPSW_IE|EPSW_IM), "n"(&CPUM), "i"(CPUM_SLEEP)
|
|
: "cc");
|
|
#endif
|
|
}
|
|
|
|
#define __sleep_cpu() \
|
|
do { \
|
|
asm volatile( \
|
|
" bset %1,(%0)\n" \
|
|
"1: btst %1,(%0)\n" \
|
|
" bne 1b\n" \
|
|
: \
|
|
: "i"(&CPUM), "i"(CPUM_SLEEP) \
|
|
: "cc" \
|
|
); \
|
|
} while (0)
|
|
|
|
static inline void arch_local_cli(void)
|
|
{
|
|
asm volatile(
|
|
" and %0,epsw \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
" nop \n"
|
|
:
|
|
: "i"(~EPSW_IE)
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
static inline unsigned long arch_local_cli_save(void)
|
|
{
|
|
unsigned long flags = arch_local_save_flags();
|
|
arch_local_cli();
|
|
return flags;
|
|
}
|
|
|
|
static inline void arch_local_sti(void)
|
|
{
|
|
asm volatile(
|
|
" or %0,epsw \n"
|
|
:
|
|
: "i"(EPSW_IE)
|
|
: "memory");
|
|
}
|
|
|
|
static inline void arch_local_change_intr_mask_level(unsigned long level)
|
|
{
|
|
asm volatile(
|
|
" and %0,epsw \n"
|
|
" or %1,epsw \n"
|
|
:
|
|
: "i"(~EPSW_IM), "i"(EPSW_IE | level)
|
|
: "cc", "memory");
|
|
}
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
#define LOCAL_SAVE_FLAGS(reg) \
|
|
mov epsw,reg
|
|
|
|
#define LOCAL_IRQ_DISABLE \
|
|
and ~EPSW_IM,epsw; \
|
|
or EPSW_IE|MN10300_CLI_LEVEL,epsw; \
|
|
nop; \
|
|
nop; \
|
|
nop
|
|
|
|
#define LOCAL_IRQ_ENABLE \
|
|
or EPSW_IE|EPSW_IM_7,epsw
|
|
|
|
#define LOCAL_IRQ_RESTORE(reg) \
|
|
mov reg,epsw
|
|
|
|
#define LOCAL_CLI_SAVE(reg) \
|
|
mov epsw,reg; \
|
|
and ~EPSW_IE,epsw; \
|
|
nop; \
|
|
nop; \
|
|
nop
|
|
|
|
#define LOCAL_CLI \
|
|
and ~EPSW_IE,epsw; \
|
|
nop; \
|
|
nop; \
|
|
nop
|
|
|
|
#define LOCAL_STI \
|
|
or EPSW_IE,epsw
|
|
|
|
#define LOCAL_CHANGE_INTR_MASK_LEVEL(level) \
|
|
and ~EPSW_IM,epsw; \
|
|
or EPSW_IE|(level),epsw
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _ASM_IRQFLAGS_H */
|