3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
7 * Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com)
9 * most of these calls might reasonably be moved to ../kernel -PB
11 * The basic principle is to construct a stack frame in C then call
12 * some assembly which adopts that stack, does some rfi magic, may
13 * switch wide/narrow mode, and calls the routine described by the
14 * 'fn' parameter WHICH IS NOT A FUNCTION POINTER!!!!!!!!!!!!!!!!
16 #include <linux/spinlock.h>
17 #include <asm/system.h>
19 #include <asm/pgtable.h> /* for __pa() */
22 static spinlock_t pdc_lock = SPIN_LOCK_UNLOCKED;
24 /***************** 32-bit real-mode calls ***********/
25 /* The struct below is used
26 * to overlay real_stack (real2.S), preparing a 32-bit call frame.
27 * real32_call_asm() then uses this stack in narrow real mode
31 /* use int, not long which is 64 bits */
46 unsigned int frame_marker[8];
48 /* in reality, there's nearly 8k of stack after this */
52 real32_call(unsigned long fn, ...)
57 extern struct narrow_stack real_stack;
58 extern unsigned long real32_call_asm(unsigned int *,
59 unsigned int *, unsigned int);
62 real_stack.arg0 = va_arg(args, unsigned int);
63 real_stack.arg1 = va_arg(args, unsigned int);
64 real_stack.arg2 = va_arg(args, unsigned int);
65 real_stack.arg3 = va_arg(args, unsigned int);
66 real_stack.arg4 = va_arg(args, unsigned int);
67 real_stack.arg5 = va_arg(args, unsigned int);
68 real_stack.arg6 = va_arg(args, unsigned int);
69 real_stack.arg7 = va_arg(args, unsigned int);
70 real_stack.arg8 = va_arg(args, unsigned int);
71 real_stack.arg9 = va_arg(args, unsigned int);
72 real_stack.arg10 = va_arg(args, unsigned int);
73 real_stack.arg11 = va_arg(args, unsigned int);
74 real_stack.arg12 = va_arg(args, unsigned int);
75 real_stack.arg13 = va_arg(args, unsigned int);
83 spin_lock_irqsave(&pdc_lock, flags);
84 r = real32_call_asm(&real_stack.sp, &real_stack.arg0, fn);
85 spin_unlock_irqrestore(&pdc_lock, flags);
91 /***************** 64-bit real-mode calls ***********/
108 unsigned long frame_marker[2]; /* rp, previous sp */
110 /* in reality, there's nearly 8k of stack after this */
114 real64_call(unsigned long fn, ...)
119 extern struct wide_stack real_stack;
120 extern unsigned long real64_call_asm(unsigned long *,
121 unsigned long *, unsigned long);
124 real_stack.arg0 = va_arg(args, unsigned long);
125 real_stack.arg1 = va_arg(args, unsigned long);
126 real_stack.arg2 = va_arg(args, unsigned long);
127 real_stack.arg3 = va_arg(args, unsigned long);
128 real_stack.arg4 = va_arg(args, unsigned long);
129 real_stack.arg5 = va_arg(args, unsigned long);
130 real_stack.arg6 = va_arg(args, unsigned long);
131 real_stack.arg7 = va_arg(args, unsigned long);
132 real_stack.arg8 = va_arg(args, unsigned long);
133 real_stack.arg9 = va_arg(args, unsigned long);
134 real_stack.arg10 = va_arg(args, unsigned long);
135 real_stack.arg11 = va_arg(args, unsigned long);
136 real_stack.arg12 = va_arg(args, unsigned long);
137 real_stack.arg13 = va_arg(args, unsigned long);
142 fn = PAGE0->mem_pdc_hi;
144 fn |= PAGE0->mem_pdc;
147 spin_lock_irqsave(&pdc_lock, flags);
148 r = real64_call_asm(&real_stack.sp, &real_stack.arg0, fn);
149 spin_unlock_irqrestore(&pdc_lock, flags);