Import of Linux/MIPS 2.1.36

1 files changed, 170 insertions, 0 deletions

diff --git a/arch/sparc64/prom/p1275.c b/arch/sparc64/prom/p1275.c
new file mode 100644
index 000000000..3eb0311df
--- /dev/null
+++ b/arch/sparc64/prom/p1275.c
@@ -0,0 +1,170 @@
+/* $Id: p1275.c,v 1.8 1997/04/03 09:29:21 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/string.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/system.h>
+#include <asm/spitfire.h>
+#include <asm/pstate.h>
+
+/* If you change layout of this structure, please change the prom_doit
+   function below as well. */
+typedef struct {
+	unsigned prom_doit_code [24];		/* 0x8000 */
+	long prom_sync_routine;			/* 0x8060 */
+	void (*prom_cif_handler)(long *);	/* 0x8068 */
+	unsigned long prom_cif_stack;		/* 0x8070 */
+	unsigned long prom_args [23];		/* 0x8078 */
+	char prom_buffer [7888];
+} at0x8000;
+
+static void (*prom_do_it)(void);
+
+void prom_cif_interface (void) __attribute__ ((__section__ (".p1275")));
+
+/* At most 14 insns */
+void prom_cif_interface (void)
+{
+	__asm__ __volatile__ ("
+	sethi	%%hi(0x8000), %%o0
+	ldx	[%%o0 + 0x070], %%o1	! prom_cif_stack
+	save	%%o1, -0xc0, %%sp
+	ldx	[%%i0 + 0x068], %%l2	! prom_cif_handler
+	rdpr	%%pstate, %%l4
+	mov	%%g4, %%l0
+	mov	%%g6, %%l1
+	wrpr	%%l4, %0, %%pstate	! turn on address masking
+	call	%%l2
+	 or	%%i0, 0x078, %%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, %0, %%l3		! constant below as well
+	wrpr	%%l3, %%pstate
+	ldx	[%%o0 + 0x060], %%l2
+	call	%%l2
+	 nop
+	wrpr	%%l4, 0, %%pstate
+	ret
+	 restore
+	" : : "i" (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;
+	at0x8000 *low = (at0x8000 *)(0x8000);
+	
+	p = low->prom_buffer;
+	save_and_cli(flags);
+	ctx = spitfire_get_primary_context ();
+	if (ctx) {
+		flushw_user ();
+		spitfire_set_primary_context (0);
+	}
+	low->prom_args[0] = (unsigned long)p;			/* service */
+	strcpy (p, service);
+	p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
+	low->prom_args[1] = nargs = (fmt & 0x0f);		/* nargs */
+	low->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:
+			low->prom_args[i + 3] = (unsigned)va_arg(list, long); break;
+		case P1275_ARG_IN_STRING:
+			strcpy (p, va_arg(list, char *));
+			low->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 *);
+			low->prom_args[i + 3] = (unsigned long)p;
+			x = va_arg(list, long);
+			i++; attrs >>= 3;
+			p = (char *)(((long)(p + (int)x + 7)) & ~7);
+			low->prom_args[i + 3] = x;
+			break;
+		case P1275_ARG_IN_BUF:
+			q = va_arg(list, char *);
+			low->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);
+			low->prom_args[i + 3] = x;
+			break;
+		case P1275_ARG_OUT_32B:
+			(void) va_arg(list, char *);
+			low->prom_args[i + 3] = (unsigned long)p;
+			p += 32;
+			break;
+		case P1275_ARG_IN_FUNCTION:
+			low->prom_args[i + 3] = 0x8038;
+			low->prom_sync_routine = va_arg(list, long); break;
+		}
+	}
+	va_end(list);
+	
+	(*prom_do_it)();
+
+	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 *)(low->prom_args[i + 3]), (int)x);
+			i++; attrs >>= 3;
+			break;
+		case P1275_ARG_OUT_32B:
+			p = va_arg(list, char *);
+			memcpy (p, (char *)(low->prom_args[i + 3]), 32);
+			break;
+		}
+	}
+	va_end(list);
+	x = low->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)
+{
+	at0x8000 *low = (at0x8000 *)(0x8000);
+
+	low->prom_cif_handler = (void (*)(long *))cif_handler;
+	low->prom_cif_stack = (unsigned long)cif_stack;
+        prom_do_it = (void (*)(void))(0x8000);
+}