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/* $OpenBSD: bugio.c,v 1.17 2006/05/02 21:43:08 miod Exp $ */
/* Copyright (c) 1998 Steve Murphree, Jr. */
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/asm_macro.h>
#include <machine/bugio.h>
#include <machine/prom.h>
register_t ossr0, ossr1, ossr2, ossr3;
register_t bugsr3;
unsigned long bugvec[2], sysbugvec[2];
void bug_vector(void);
void sysbug_vector(void);
#ifdef MULTIPROCESSOR
#include <sys/lock.h>
__cpu_simple_lock_t bug_lock = __SIMPLELOCK_UNLOCKED;
#define BUG_LOCK() __cpu_simple_lock(&bug_lock)
#define BUG_UNLOCK() __cpu_simple_unlock(&bug_lock)
#else
#define BUG_LOCK() do { } while (0)
#define BUG_UNLOCK() do { } while (0)
#endif
#define MVMEPROM_CALL(x) \
__asm__ __volatile__ ("or r9,r0," __STRING(x)); \
__asm__ __volatile__ ("tb0 0,r0,496" ::: \
"r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
"r9", "r10", "r11", "r12", "r13")
void
bug_vector()
{
unsigned long *vbr;
__asm__ __volatile__ ("ldcr %0, cr7" : "=r" (vbr));
vbr[2 * MVMEPROM_VECTOR + 0] = bugvec[0];
vbr[2 * MVMEPROM_VECTOR + 1] = bugvec[1];
}
void
sysbug_vector()
{
unsigned long *vbr;
__asm__ __volatile__ ("ldcr %0, cr7" : "=r" (vbr));
vbr[2 * MVMEPROM_VECTOR + 0] = sysbugvec[0];
vbr[2 * MVMEPROM_VECTOR + 1] = sysbugvec[1];
}
#define BUGCTXT() \
{ \
BUG_LOCK(); \
disable_interrupt(psr); /* paranoia */ \
bug_vector(); \
__asm__ __volatile__ ("ldcr %0, cr17" : "=r" (ossr0)); \
__asm__ __volatile__ ("ldcr %0, cr18" : "=r" (ossr1)); \
__asm__ __volatile__ ("ldcr %0, cr19" : "=r" (ossr2)); \
__asm__ __volatile__ ("ldcr %0, cr20" : "=r" (ossr3)); \
\
__asm__ __volatile__ ("stcr %0, cr20" :: "r"(bugsr3)); \
}
#define OSCTXT() \
{ \
__asm__ __volatile__ ("ldcr %0, cr20" : "=r" (bugsr3)); \
\
__asm__ __volatile__ ("stcr %0, cr17" :: "r"(ossr0)); \
__asm__ __volatile__ ("stcr %0, cr18" :: "r"(ossr1)); \
__asm__ __volatile__ ("stcr %0, cr19" :: "r"(ossr2)); \
__asm__ __volatile__ ("stcr %0, cr20" :: "r"(ossr3)); \
sysbug_vector(); \
set_psr(psr); \
BUG_UNLOCK(); \
}
void
bugpcrlf(void)
{
u_int psr;
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_OUTCRLF);
OSCTXT();
}
void
buginit()
{
__asm__ __volatile__ ("ldcr %0, cr20" : "=r" (bugsr3));
}
char
buginchr(void)
{
u_int psr;
int ret;
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_INCHR);
__asm__ __volatile__ ("or %0,r0,r2" : "=r" (ret));
OSCTXT();
return ((char)ret & 0xff);
}
void
bugoutchr(int c)
{
u_int psr;
BUGCTXT();
__asm__ __volatile__ ("or r2,r0,%0" : : "r" (c));
MVMEPROM_CALL(MVMEPROM_OUTCHR);
OSCTXT();
}
void
bugreturn(void)
{
u_int psr;
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_EXIT);
OSCTXT();
}
void
bugbrdid(struct mvmeprom_brdid *id)
{
u_int psr;
struct mvmeprom_brdid *ptr;
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_GETBRDID);
__asm__ __volatile__ ("or %0,r0,r2" : "=r" (ptr));
OSCTXT();
bcopy(ptr, id, sizeof(struct mvmeprom_brdid));
}
void
bugdiskrd(struct mvmeprom_dskio *dio)
{
u_int psr;
BUGCTXT();
__asm__ __volatile__ ("or r2, r0, %0" : : "r" (dio));
MVMEPROM_CALL(MVMEPROM_DSKRD);
OSCTXT();
}
#ifdef MULTIPROCESSOR
/*
* Ask the BUG to start a particular cpu at our provided address.
*/
int
spin_cpu(cpuid_t cpu, vaddr_t address)
{
u_int psr;
int ret;
BUGCTXT();
__asm__ __volatile__ ("or r2, r0, %0" : : "r" (cpu));
__asm__ __volatile__ ("or r3, r0, %0" : : "r" (address));
MVMEPROM_CALL(MVMEPROM_FORKMPU);
__asm__ __volatile__ ("or %0,r0,r2" : "=r" (ret));
OSCTXT();
return (ret);
}
#endif /* MULTIPROCESSOR */
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