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/* $Id: p1275.c,v 1.12 1997/07/26 18:39:01 davem Exp $
* p1275.c: Sun IEEE 1275 PROM low level interface routines
*
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/spitfire.h>
#include <asm/pstate.h>
struct {
long prom_sync_routine; /* 0x00 */
void (*prom_cif_handler)(long *); /* 0x08 */
unsigned long prom_cif_stack; /* 0x10 */
unsigned long prom_args [23]; /* 0x18 */
char prom_buffer [3000];
} p1275buf;
void prom_cif_interface (void)
{
__asm__ __volatile__ ("
mov %0, %%o0
ldx [%%o0 + 0x010], %%o1 ! prom_cif_stack
save %%o1, -0xc0, %%sp
ldx [%%i0 + 0x008], %%l2 ! prom_cif_handler
rdpr %%pstate, %%l4
mov %%g4, %%l0
mov %%g6, %%l1
wrpr %%l4, %1, %%pstate ! turn on address masking
call %%l2
add %%i0, 0x018, %%o0 ! prom_args
wrpr %%l4, 0, %%pstate ! put pstate back
mov %%l0, %%g4
ret
restore %%l1, 0, %%g6
save %%sp, -0xc0, %%sp ! If you change the offset of the save
rdpr %%pstate, %%l4 ! here, please change the 0x8038
andn %%l4, %1, %%l3 ! constant below as well
wrpr %%l3, %%pstate
ldx [%%o0 + 0x000], %%l2
call %%l2
nop
wrpr %%l4, 0, %%pstate
ret
restore
" : : "r" (&p1275buf), "i" (0 /* PSTATE_AM */));
}
long p1275_cmd (char *service, long fmt, ...)
{
char *p, *q;
unsigned long flags;
int nargs, nrets, i;
va_list list;
long attrs, x;
long ctx = 0;
p = p1275buf.prom_buffer;
__save_and_cli(flags);
ctx = spitfire_get_primary_context ();
if (ctx) {
flushw_user ();
spitfire_set_primary_context (0);
}
p1275buf.prom_args[0] = (unsigned long)p; /* service */
strcpy (p, service);
p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
p1275buf.prom_args[1] = nargs = (fmt & 0x0f); /* nargs */
p1275buf.prom_args[2] = nrets = ((fmt & 0xf0) >> 4); /* nrets */
attrs = fmt >> 8;
va_start(list, fmt);
for (i = 0; i < nargs; i++, attrs >>= 3) {
switch (attrs & 0x7) {
case P1275_ARG_NUMBER:
p1275buf.prom_args[i + 3] = (unsigned)va_arg(list, long); break;
case P1275_ARG_IN_STRING:
strcpy (p, va_arg(list, char *));
p1275buf.prom_args[i + 3] = (unsigned long)p;
p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
break;
case P1275_ARG_OUT_BUF:
(void) va_arg(list, char *);
p1275buf.prom_args[i + 3] = (unsigned long)p;
x = va_arg(list, long);
i++; attrs >>= 3;
p = (char *)(((long)(p + (int)x + 7)) & ~7);
p1275buf.prom_args[i + 3] = x;
break;
case P1275_ARG_IN_BUF:
q = va_arg(list, char *);
p1275buf.prom_args[i + 3] = (unsigned long)p;
x = va_arg(list, long);
i++; attrs >>= 3;
memcpy (p, q, (int)x);
p = (char *)(((long)(p + (int)x + 7)) & ~7);
p1275buf.prom_args[i + 3] = x;
break;
case P1275_ARG_OUT_32B:
(void) va_arg(list, char *);
p1275buf.prom_args[i + 3] = (unsigned long)p;
p += 32;
break;
case P1275_ARG_IN_FUNCTION:
p1275buf.prom_args[i + 3] = (unsigned long)prom_cif_interface + 0x38;
p1275buf.prom_sync_routine = va_arg(list, long); break;
}
}
va_end(list);
prom_cif_interface();
attrs = fmt >> 8;
va_start(list, fmt);
for (i = 0; i < nargs; i++, attrs >>= 3) {
switch (attrs & 0x7) {
case P1275_ARG_NUMBER:
(void) va_arg(list, long); break;
case P1275_ARG_IN_STRING:
(void) va_arg(list, char *); break;
case P1275_ARG_IN_FUNCTION:
(void) va_arg(list, long); break;
case P1275_ARG_IN_BUF:
(void) va_arg(list, char *);
(void) va_arg(list, long);
i++; attrs >>= 3;
break;
case P1275_ARG_OUT_BUF:
p = va_arg(list, char *);
x = va_arg(list, long);
memcpy (p, (char *)(p1275buf.prom_args[i + 3]), (int)x);
i++; attrs >>= 3;
break;
case P1275_ARG_OUT_32B:
p = va_arg(list, char *);
memcpy (p, (char *)(p1275buf.prom_args[i + 3]), 32);
break;
}
}
va_end(list);
x = p1275buf.prom_args [nargs + 3];
if (ctx)
spitfire_set_primary_context (ctx);
__restore_flags(flags);
return x;
}
void prom_cif_init(void *cif_handler, void *cif_stack)
{
p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
p1275buf.prom_cif_stack = (unsigned long)cif_stack;
}
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