1 /* Prom access routines for the sun3x */
3 #include <linux/types.h>
4 #include <linux/kernel.h>
6 #include <linux/console.h>
7 #include <linux/init.h>
9 #include <linux/string.h>
12 #include <asm/pgtable.h>
13 #include <asm/setup.h>
14 #include <asm/traps.h>
15 #include <asm/sun3xprom.h>
16 #include <asm/idprom.h>
17 #include <asm/segment.h>
18 #include <asm/sun3ints.h>
19 #include <asm/openprom.h>
20 #include <asm/machines.h>
22 void (*sun3x_putchar
)(int);
23 int (*sun3x_getchar
)(void);
24 int (*sun3x_mayget
)(void);
25 int (*sun3x_mayput
)(int);
26 void (*sun3x_prom_reboot
)(void);
27 e_vector sun3x_prom_abort
;
28 struct linux_romvec
*romvec
;
30 /* prom vector table */
31 e_vector
*sun3x_prom_vbr
;
33 /* Handle returning to the prom */
38 /* Disable interrupts while we mess with things */
39 local_irq_save(flags
);
41 /* Restore prom vbr */
42 asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr
));
44 /* Restore prom NMI clock */
45 // sun3x_disable_intreg(5);
49 asm volatile ("trap #14");
51 /* Restore everything */
55 asm volatile ("movec %0,%%vbr" : : "r" ((void*)vectors
));
56 local_irq_restore(flags
);
59 void sun3x_reboot(void)
61 /* This never returns, don't bother saving things */
64 /* Restore prom vbr */
65 asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr
));
67 /* Restore prom NMI clock */
72 (*romvec
->pv_reboot
)("vmlinux");
75 static void sun3x_prom_write(struct console
*co
, const char *s
,
85 /* debug console - write-only */
87 static struct console sun3x_debug
= {
89 .write
= sun3x_prom_write
,
90 .flags
= CON_PRINTBUFFER
,
94 void __init
sun3x_prom_init(void)
96 /* Read the vector table */
98 sun3x_putchar
= *(void (**)(int)) (SUN3X_P_PUTCHAR
);
99 sun3x_getchar
= *(int (**)(void)) (SUN3X_P_GETCHAR
);
100 sun3x_mayget
= *(int (**)(void)) (SUN3X_P_MAYGET
);
101 sun3x_mayput
= *(int (**)(int)) (SUN3X_P_MAYPUT
);
102 sun3x_prom_reboot
= *(void (**)(void)) (SUN3X_P_REBOOT
);
103 sun3x_prom_abort
= *(e_vector
*) (SUN3X_P_ABORT
);
104 romvec
= (struct linux_romvec
*)SUN3X_PROM_BASE
;
108 if (!((idprom
->id_machtype
& SM_ARCH_MASK
) == SM_SUN3X
)) {
109 pr_warn("Machine reports strange type %02x\n",
110 idprom
->id_machtype
);
111 pr_warn("Pretending it's a 3/80, but very afraid...\n");
112 idprom
->id_machtype
= SM_SUN3X
| SM_3_80
;
115 /* point trap #14 at abort.
116 * XXX this is futile since we restore the vbr first - oops
118 vectors
[VEC_TRAP14
] = sun3x_prom_abort
;
121 static int __init
sun3x_debug_setup(char *arg
)
123 /* If debug=prom was specified, start the debug console */
124 if (MACH_IS_SUN3X
&& !strcmp(arg
, "prom"))
125 register_console(&sun3x_debug
);
129 early_param("debug", sun3x_debug_setup
);
131 /* some prom functions to export */
132 int prom_getintdefault(int node
, char *property
, int deflt
)
137 int prom_getbool (int node
, char *prop
)
142 void prom_printf(char *fmt
, ...)
146 void prom_halt (void)
151 /* Get the idprom and stuff it into buffer 'idbuf'. Returns the
152 * format type. 'num_bytes' is the number of bytes that your idbuf
153 * has space for. Returns 0xff on error.
156 prom_get_idprom(char *idbuf
, int num_bytes
)
160 /* make a copy of the idprom structure */
161 for (i
= 0; i
< num_bytes
; i
++)
162 idbuf
[i
] = ((char *)SUN3X_IDPROM
)[i
];