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authorBryan Wu <bryan.wu@analog.com>2007-05-06 17:50:22 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 15:12:58 -0400
commit1394f03221790a988afc3e4b3cb79f2e477246a9 (patch)
tree2c1963c9a4f2d84a5e021307fde240c5d567cf70 /arch/blackfin/kernel/entry.S
parent73243284463a761e04d69d22c7516b2be7de096c (diff)
blackfin architecture
This adds support for the Analog Devices Blackfin processor architecture, and currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561 (Dual Core) devices, with a variety of development platforms including those avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP, BF561-EZKIT), and Bluetechnix! Tinyboards. The Blackfin architecture was jointly developed by Intel and Analog Devices Inc. (ADI) as the Micro Signal Architecture (MSA) core and introduced it in December of 2000. Since then ADI has put this core into its Blackfin processor family of devices. The Blackfin core has the advantages of a clean, orthogonal,RISC-like microprocessor instruction set. It combines a dual-MAC (Multiply/Accumulate), state-of-the-art signal processing engine and single-instruction, multiple-data (SIMD) multimedia capabilities into a single instruction-set architecture. The Blackfin architecture, including the instruction set, is described by the ADSP-BF53x/BF56x Blackfin Processor Programming Reference http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf The Blackfin processor is already supported by major releases of gcc, and there are binary and source rpms/tarballs for many architectures at: http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete documentation, including "getting started" guides available at: http://docs.blackfin.uclinux.org/ which provides links to the sources and patches you will need in order to set up a cross-compiling environment for bfin-linux-uclibc This patch, as well as the other patches (toolchain, distribution, uClibc) are actively supported by Analog Devices Inc, at: http://blackfin.uclinux.org/ We have tested this on LTP, and our test plan (including pass/fails) can be found at: http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel [m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files] Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl> Signed-off-by: Aubrey Li <aubrey.li@analog.com> Signed-off-by: Jie Zhang <jie.zhang@analog.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/blackfin/kernel/entry.S')
-rw-r--r--arch/blackfin/kernel/entry.S94
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/entry.S b/arch/blackfin/kernel/entry.S
new file mode 100644
index 000000000000..5880b270bd50
--- /dev/null
+++ b/arch/blackfin/kernel/entry.S
@@ -0,0 +1,94 @@
1/*
2 * File: arch/blackfin/kernel/entry.S
3 * Based on:
4 * Author:
5 *
6 * Created:
7 * Description:
8 *
9 * Modified:
10 * Copyright 2004-2006 Analog Devices Inc.
11 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 */
29
30#include <linux/linkage.h>
31#include <asm/thread_info.h>
32#include <asm/errno.h>
33#include <asm/asm-offsets.h>
34
35#include <asm/mach-common/context.S>
36
37#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
38.section .l1.text
39#else
40.text
41#endif
42
43ENTRY(_ret_from_fork)
44 SP += -12;
45 call _schedule_tail;
46 SP += 12;
47 r0 = [sp + PT_IPEND];
48 cc = bittst(r0,1);
49 if cc jump .Lin_kernel;
50 RESTORE_CONTEXT
51 rti;
52.Lin_kernel:
53 bitclr(r0,1);
54 [sp + PT_IPEND] = r0;
55 /* do a 'fake' RTI by jumping to [RETI]
56 * to avoid clearing supervisor mode in child
57 */
58 RESTORE_ALL_SYS
59 p0 = reti;
60 jump (p0);
61
62ENTRY(_sys_fork)
63 r0 = -EINVAL;
64 rts;
65
66ENTRY(_sys_vfork)
67 r0 = sp;
68 r0 += 24;
69 [--sp] = rets;
70 SP += -12;
71 call _bfin_vfork;
72 SP += 12;
73 rets = [sp++];
74 rts;
75
76ENTRY(_sys_clone)
77 r0 = sp;
78 r0 += 24;
79 [--sp] = rets;
80 SP += -12;
81 call _bfin_clone;
82 SP += 12;
83 rets = [sp++];
84 rts;
85
86ENTRY(_sys_rt_sigreturn)
87 r0 = sp;
88 r0 += 24;
89 [--sp] = rets;
90 SP += -12;
91 call _do_rt_sigreturn;
92 SP += 12;
93 rets = [sp++];
94 rts;