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/* $OpenBSD: bugio.c,v 1.19 2010/12/23 20:05:08 miod Exp $ */
/*
* Copyright (c) 2006, 2010, Miodrag Vallat.
* Copyright (c) 1998 Steve Murphree, Jr.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/asm_macro.h>
#include <machine/bugio.h>
#include <machine/prom.h>
register_t ossr3;
register_t bugsr3;
#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) "; tb0 0,r0,496" \
::: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
"r9", "r10", "r11", "r12", "r13", "memory")
#define BUGCTXT() \
{ \
BUG_LOCK(); \
psr = get_psr(); \
set_psr(psr | PSR_IND); /* paranoia */ \
__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, cr20" :: "r"(ossr3)); \
set_psr(psr); \
BUG_UNLOCK(); \
}
void
bugpcrlf(void)
{
u_int psr;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_OUTCRLF);
OSCTXT();
}
void
buginit()
{
__asm__ __volatile__ ("ldcr %0, cr20" : "=r" (bugsr3));
}
char
buginchr(void)
{
u_int psr;
int ret;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
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;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
BUGCTXT();
__asm__ __volatile__ ("or r2,r0,%0" : : "r" (c));
MVMEPROM_CALL(MVMEPROM_OUTCHR);
OSCTXT();
}
void
bugreturn(void)
{
u_int psr;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
BUGCTXT();
MVMEPROM_CALL(MVMEPROM_EXIT);
OSCTXT();
}
void
bugbrdid(struct mvmeprom_brdid *id)
{
u_int psr;
struct mvmeprom_brdid *ptr;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
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;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
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;
#ifdef DIAGNOSTIC
if (!cold)
panic("%s: BUG calls are forbidden at this point", __func__);
#endif
BUGCTXT();
__asm__ __volatile__ ("or r2, r0, %0; or r3, r0, %1" ::
"r" (cpu), "r" (address));
MVMEPROM_CALL(MVMEPROM_FORKMPU);
__asm__ __volatile__ ("or %0,r0,r2" : "=r" (ret));
OSCTXT();
return (ret);
}
#endif /* MULTIPROCESSOR */
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