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/* $Id: p1275.c,v 1.20 1999/11/23 23:47:56 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 <linux/spinlock.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/spitfire.h>
#include <asm/pstate.h>
struct {
long prom_callback; /* 0x00 */
void (*prom_cif_handler)(long *); /* 0x08 */
unsigned long prom_cif_stack; /* 0x10 */
unsigned long prom_args [23]; /* 0x18 */
char prom_buffer [3000];
} p1275buf;
extern void prom_world(int);
void prom_cif_interface (void)
{
__asm__ __volatile__ ("
mov %0, %%o0
ldx [%%o0 + 0x010], %%o1 ! prom_cif_stack
save %%o1, -0x190, %%sp
ldx [%%i0 + 0x008], %%l2 ! prom_cif_handler
rdpr %%pstate, %%l4
wrpr %%g0, 0x15, %%pstate ! save alternate globals
stx %%g1, [%%sp + 2047 + 0x0b0]
stx %%g2, [%%sp + 2047 + 0x0b8]
stx %%g3, [%%sp + 2047 + 0x0c0]
stx %%g4, [%%sp + 2047 + 0x0c8]
stx %%g5, [%%sp + 2047 + 0x0d0]
stx %%g6, [%%sp + 2047 + 0x0d8]
stx %%g7, [%%sp + 2047 + 0x0e0]
wrpr %%g0, 0x814, %%pstate ! save interrupt globals
stx %%g1, [%%sp + 2047 + 0x0e8]
stx %%g2, [%%sp + 2047 + 0x0f0]
stx %%g3, [%%sp + 2047 + 0x0f8]
stx %%g4, [%%sp + 2047 + 0x100]
stx %%g5, [%%sp + 2047 + 0x108]
stx %%g6, [%%sp + 2047 + 0x110]
stx %%g7, [%%sp + 2047 + 0x118]
wrpr %%g0, 0x14, %%pstate ! save normal globals
stx %%g1, [%%sp + 2047 + 0x120]
stx %%g2, [%%sp + 2047 + 0x128]
stx %%g3, [%%sp + 2047 + 0x130]
stx %%g4, [%%sp + 2047 + 0x138]
stx %%g5, [%%sp + 2047 + 0x140]
stx %%g6, [%%sp + 2047 + 0x148]
stx %%g7, [%%sp + 2047 + 0x150]
wrpr %%g0, 0x414, %%pstate ! save mmu globals
stx %%g1, [%%sp + 2047 + 0x158]
stx %%g2, [%%sp + 2047 + 0x160]
stx %%g3, [%%sp + 2047 + 0x168]
stx %%g4, [%%sp + 2047 + 0x170]
stx %%g5, [%%sp + 2047 + 0x178]
stx %%g6, [%%sp + 2047 + 0x180]
stx %%g7, [%%sp + 2047 + 0x188]
mov %%g1, %%l0 ! also save to locals, so we can handle
mov %%g2, %%l1 ! tlb faults later on, when accessing
mov %%g3, %%l3 ! the stack.
mov %%g7, %%l5
wrpr %%l4, %1, %%pstate ! turn off interrupts
call %%l2
add %%i0, 0x018, %%o0 ! prom_args
wrpr %%g0, 0x414, %%pstate ! restore mmu globals
mov %%l0, %%g1
mov %%l1, %%g2
mov %%l3, %%g3
mov %%l5, %%g7
wrpr %%g0, 0x14, %%pstate ! restore normal globals
ldx [%%sp + 2047 + 0x120], %%g1
ldx [%%sp + 2047 + 0x128], %%g2
ldx [%%sp + 2047 + 0x130], %%g3
ldx [%%sp + 2047 + 0x138], %%g4
ldx [%%sp + 2047 + 0x140], %%g5
ldx [%%sp + 2047 + 0x148], %%g6
ldx [%%sp + 2047 + 0x150], %%g7
wrpr %%g0, 0x814, %%pstate ! restore interrupt globals
ldx [%%sp + 2047 + 0x0e8], %%g1
ldx [%%sp + 2047 + 0x0f0], %%g2
ldx [%%sp + 2047 + 0x0f8], %%g3
ldx [%%sp + 2047 + 0x100], %%g4
ldx [%%sp + 2047 + 0x108], %%g5
ldx [%%sp + 2047 + 0x110], %%g6
ldx [%%sp + 2047 + 0x118], %%g7
wrpr %%g0, 0x15, %%pstate ! restore alternate globals
ldx [%%sp + 2047 + 0x0b0], %%g1
ldx [%%sp + 2047 + 0x0b8], %%g2
ldx [%%sp + 2047 + 0x0c0], %%g3
ldx [%%sp + 2047 + 0x0c8], %%g4
ldx [%%sp + 2047 + 0x0d0], %%g5
ldx [%%sp + 2047 + 0x0d8], %%g6
ldx [%%sp + 2047 + 0x0e0], %%g7
wrpr %%l4, 0, %%pstate ! restore original pstate
ret
restore
" : : "r" (&p1275buf), "i" (PSTATE_IE));
}
void prom_cif_callback(void)
{
__asm__ __volatile__ ("
mov %0, %%o1
save %%sp, -0x270, %%sp
rdpr %%pstate, %%l4
wrpr %%g0, 0x15, %%pstate ! save PROM alternate globals
stx %%g1, [%%sp + 2047 + 0x0b0]
stx %%g2, [%%sp + 2047 + 0x0b8]
stx %%g3, [%%sp + 2047 + 0x0c0]
stx %%g4, [%%sp + 2047 + 0x0c8]
stx %%g5, [%%sp + 2047 + 0x0d0]
stx %%g6, [%%sp + 2047 + 0x0d8]
stx %%g7, [%%sp + 2047 + 0x0e0]
! restore Linux alternate globals
ldx [%%sp + 2047 + 0x190], %%g1
ldx [%%sp + 2047 + 0x198], %%g2
ldx [%%sp + 2047 + 0x1a0], %%g3
ldx [%%sp + 2047 + 0x1a8], %%g4
ldx [%%sp + 2047 + 0x1b0], %%g5
ldx [%%sp + 2047 + 0x1b8], %%g6
ldx [%%sp + 2047 + 0x1c0], %%g7
wrpr %%g0, 0x814, %%pstate ! save PROM interrupt globals
stx %%g1, [%%sp + 2047 + 0x0e8]
stx %%g2, [%%sp + 2047 + 0x0f0]
stx %%g3, [%%sp + 2047 + 0x0f8]
stx %%g4, [%%sp + 2047 + 0x100]
stx %%g5, [%%sp + 2047 + 0x108]
stx %%g6, [%%sp + 2047 + 0x110]
stx %%g7, [%%sp + 2047 + 0x118]
! restore Linux interrupt globals
ldx [%%sp + 2047 + 0x1c8], %%g1
ldx [%%sp + 2047 + 0x1d0], %%g2
ldx [%%sp + 2047 + 0x1d8], %%g3
ldx [%%sp + 2047 + 0x1e0], %%g4
ldx [%%sp + 2047 + 0x1e8], %%g5
ldx [%%sp + 2047 + 0x1f0], %%g6
ldx [%%sp + 2047 + 0x1f8], %%g7
wrpr %%g0, 0x14, %%pstate ! save PROM normal globals
stx %%g1, [%%sp + 2047 + 0x120]
stx %%g2, [%%sp + 2047 + 0x128]
stx %%g3, [%%sp + 2047 + 0x130]
stx %%g4, [%%sp + 2047 + 0x138]
stx %%g5, [%%sp + 2047 + 0x140]
stx %%g6, [%%sp + 2047 + 0x148]
stx %%g7, [%%sp + 2047 + 0x150]
! restore Linux normal globals
ldx [%%sp + 2047 + 0x200], %%g1
ldx [%%sp + 2047 + 0x208], %%g2
ldx [%%sp + 2047 + 0x210], %%g3
ldx [%%sp + 2047 + 0x218], %%g4
ldx [%%sp + 2047 + 0x220], %%g5
ldx [%%sp + 2047 + 0x228], %%g6
ldx [%%sp + 2047 + 0x230], %%g7
wrpr %%g0, 0x414, %%pstate ! save PROM mmu globals
stx %%g1, [%%sp + 2047 + 0x158]
stx %%g2, [%%sp + 2047 + 0x160]
stx %%g3, [%%sp + 2047 + 0x168]
stx %%g4, [%%sp + 2047 + 0x170]
stx %%g5, [%%sp + 2047 + 0x178]
stx %%g6, [%%sp + 2047 + 0x180]
stx %%g7, [%%sp + 2047 + 0x188]
! restore Linux mmu globals
ldx [%%sp + 2047 + 0x238], %%o0
ldx [%%sp + 2047 + 0x240], %%o1
ldx [%%sp + 2047 + 0x248], %%l2
ldx [%%sp + 2047 + 0x250], %%l3
ldx [%%sp + 2047 + 0x258], %%l5
ldx [%%sp + 2047 + 0x260], %%l6
ldx [%%sp + 2047 + 0x268], %%l7
! switch to Linux tba
sethi %%hi(sparc64_ttable_tl0), %%l1
rdpr %%tba, %%l0 ! save PROM tba
mov %%o0, %%g1
mov %%o1, %%g2
mov %%l2, %%g3
mov %%l3, %%g4
mov %%l5, %%g5
mov %%l6, %%g6
mov %%l7, %%g7
wrpr %%l1, %%tba ! install Linux tba
wrpr %%l4, 0, %%pstate ! restore PSTATE
call prom_world
mov %%g0, %%o0
ldx [%%i1 + 0x000], %%l2
call %%l2
mov %%i0, %%o0
mov %%o0, %%l1
call prom_world
or %%g0, 1, %%o0
wrpr %%g0, 0x14, %%pstate ! interrupts off
! restore PROM mmu globals
ldx [%%sp + 2047 + 0x158], %%o0
ldx [%%sp + 2047 + 0x160], %%o1
ldx [%%sp + 2047 + 0x168], %%l2
ldx [%%sp + 2047 + 0x170], %%l3
ldx [%%sp + 2047 + 0x178], %%l5
ldx [%%sp + 2047 + 0x180], %%l6
ldx [%%sp + 2047 + 0x188], %%l7
wrpr %%g0, 0x414, %%pstate ! restore PROM mmu globals
mov %%o0, %%g1
mov %%o1, %%g2
mov %%l2, %%g3
mov %%l3, %%g4
mov %%l5, %%g5
mov %%l6, %%g6
mov %%l7, %%g7
wrpr %%l0, %%tba ! restore PROM tba
wrpr %%g0, 0x14, %%pstate ! restore PROM normal globals
ldx [%%sp + 2047 + 0x120], %%g1
ldx [%%sp + 2047 + 0x128], %%g2
ldx [%%sp + 2047 + 0x130], %%g3
ldx [%%sp + 2047 + 0x138], %%g4
ldx [%%sp + 2047 + 0x140], %%g5
ldx [%%sp + 2047 + 0x148], %%g6
ldx [%%sp + 2047 + 0x150], %%g7
wrpr %%g0, 0x814, %%pstate ! restore PROM interrupt globals
ldx [%%sp + 2047 + 0x0e8], %%g1
ldx [%%sp + 2047 + 0x0f0], %%g2
ldx [%%sp + 2047 + 0x0f8], %%g3
ldx [%%sp + 2047 + 0x100], %%g4
ldx [%%sp + 2047 + 0x108], %%g5
ldx [%%sp + 2047 + 0x110], %%g6
ldx [%%sp + 2047 + 0x118], %%g7
wrpr %%g0, 0x15, %%pstate ! restore PROM alternate globals
ldx [%%sp + 2047 + 0x0b0], %%g1
ldx [%%sp + 2047 + 0x0b8], %%g2
ldx [%%sp + 2047 + 0x0c0], %%g3
ldx [%%sp + 2047 + 0x0c8], %%g4
ldx [%%sp + 2047 + 0x0d0], %%g5
ldx [%%sp + 2047 + 0x0d8], %%g6
ldx [%%sp + 2047 + 0x0e0], %%g7
wrpr %%l4, 0, %%pstate
ret
restore %%l1, 0, %%o0
" : : "r" (&p1275buf), "i" (PSTATE_PRIV));
}
/* We need some SMP protection here. But be careful as
* prom callback code can call into here too, this is why
* the counter is needed. -DaveM
*/
static int prom_entry_depth = 0;
spinlock_t prom_entry_lock = SPIN_LOCK_UNLOCKED;
static __inline__ unsigned long prom_get_lock(void)
{
unsigned long flags;
__save_and_cli(flags);
if (prom_entry_depth == 0) {
spin_lock(&prom_entry_lock);
#if 1 /* DEBUGGING */
if (prom_entry_depth != 0)
panic("prom_get_lock");
#endif
}
prom_entry_depth++;
return flags;
}
static __inline__ void prom_release_lock(unsigned long flags)
{
if (--prom_entry_depth == 0)
spin_unlock(&prom_entry_lock);
__restore_flags(flags);
}
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;
ctx = spitfire_get_primary_context ();
if (ctx) {
flushw_user ();
spitfire_set_primary_context (0);
}
flags = prom_get_lock();
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_64B:
p1275buf.prom_args[i + 3] =
va_arg(list, unsigned 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_callback;
p1275buf.prom_callback = va_arg(list, long);
break;
}
}
va_end(list);
prom_world(1);
prom_cif_interface();
prom_world(0);
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];
prom_release_lock(flags);
if (ctx)
spitfire_set_primary_context (ctx);
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;
}
|
