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/*
* RTLinux Alpha-specific header.
*
* Copyright (C) 2000 Cort Dougan <cort@fsmlabs.com>
*/
#ifndef __ALPHA_CONSTANTS_H__
#define __ALPHA_CONSTANTS_H__
#include <asm/irq.h>
#define __LOCAL_IRQS__
#define MACHDEPREGS struct pt_regs *
typedef void intercept_t; /* intercept returns code determining whether
to use linux ret_from intercept */
#define MACHDEPREGS_PTR(x) (x)
#define IRQ_MAX_COUNT NR_IRQS
/*
* This really needs to be redone soon. -- Cort
*/
static __inline__ void rtl_return_from_interrupt(void)
{
unsigned long i;
extern void ret_from_sys_call(void);
extern void restore_all_rtl(void);
i = (ulong)&i;
i += 0x30;
if ( *(ulong *)i == (ulong)ret_from_sys_call )
{
*(ulong *)i = (ulong)restore_all_rtl;
return;
}
i += 0x10;
if ( *(ulong *)i == (ulong)ret_from_sys_call )
{
*(ulong *)i = (ulong)restore_all_rtl;
return;
}
for ( i = (ulong)&i; i <= ((ulong)&i) + sizeof(ulong)*1024;
i += sizeof(ulong) )
{
if ( *(ulong *)i == (ulong)ret_from_sys_call )
{
/*printk("offset %lx\n", i-((ulong)&i) );*/
*(ulong *)i = (ulong)restore_all_rtl;
return;
}
}
return;
}
#define RETURN_FROM_INTERRUPT rtl_return_from_interrupt()
#define RETURN_FROM_INTERRUPT_LINUX return
/*
* Local interrupts (specifically the timer) on Alpha are
* done with a call to the local function, then sometimes a
* call to the global interrupt handler routine. This will
* always fail since the RTLinux local intercept leaves
* interrupts soft disabled. So, we soft enable here
* so after the return we end up with soft enabled when
* calling the global handler from the Linux routine.
*
* We also have a special case for the RETURN_FROM_LOCAL, when
* we want to return directly to Linux since the local intr is
* disabled.
* -- Cort
*/
#define RETURN_FROM_LOCAL { \
if ( pnd == LOCAL_IPI_VECTOR) \
rtl_return_from_interrupt(); \
else \
return; \
}
#define RETURN_FROM_LOCAL_LINUX {rtl_soft_sti(); return;}
#define MACHDEPREGS_TO_PND(x) ({ ulong i = last_local[cpu_id]; last_local[cpu_id] = -1; i;})
#define VECTOR_TO_IRQ(vector) (vector)
#define VECTOR_TO_LOCAL_PND(vector) (vector)
#define LOCAL_PND_TO_VECTOR(x) (x)
#define rtl_getcpuid() hard_smp_processor_id()
#endif /* __ALPHA_CONSTANTS_H__ */
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