xref: /openbmc/u-boot/arch/nios2/include/asm/system.h (revision 843a7ee8)
1 /*
2  * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3  * Scott McNutt <smcnutt@psyent.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 #ifndef __ASM_NIOS2_SYSTEM_H_
24 #define __ASM_NIOS2_SYSTEM_H_
25 
26 #define local_irq_enable() __asm__ __volatile__ (  \
27 	"rdctl	r8, status\n"			   \
28 	"ori	r8, r8, 1\n"			   \
29 	"wrctl	status, r8\n"			   \
30 	: : : "r8")
31 
32 #define local_irq_disable() __asm__ __volatile__ ( \
33 	"rdctl	r8, status\n"			   \
34 	"andi	r8, r8, 0xfffe\n"		   \
35 	"wrctl	status, r8\n"			   \
36 	: : : "r8")
37 
38 #define local_save_flags(x) __asm__ __volatile__ (	\
39 	"rdctl	r8, status\n"				\
40 	"mov	%0, r8\n"				\
41 	: "=r" (x) : : "r8", "memory")
42 
43 #define local_irq_restore(x) __asm__ __volatile__ (	\
44 	"mov	r8, %0\n"				\
45 	"wrctl	status, r8\n"				\
46 	: : "r" (x) : "r8", "memory")
47 
48 /* For spinlocks etc */
49 #define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } \
50 	while (0)
51 
52 #define	irqs_disabled()					\
53 ({							\
54 	unsigned long flags;				\
55 	local_save_flags(flags);			\
56 	((flags & NIOS2_STATUS_PIE_MSK) == 0x0);	\
57 })
58 
59 /* indirect call to go beyond 256MB limitation of toolchain */
60 #define nios2_callr(addr) __asm__ __volatile__ (	\
61 	"callr	%0"					\
62 	: : "r" (addr))
63 
64 #endif /* __ASM_NIOS2_SYSTEM_H */
65