2 * arch/xtensa/kernel/coprocessor.S
4 * Xtensa processor configuration-specific table of coprocessor and
5 * other custom register layout information.
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
11 * Copyright (C) 2003 - 2005 Tensilica Inc.
13 * Marc Gauthier <marc@tensilica.com> <marc@alumni.uwaterloo.ca>
17 * This module contains a table that describes the layout of the various
18 * custom registers and states associated with each coprocessor, as well
19 * as those not associated with any coprocessor ("extra state").
20 * This table is included with core dumps and is available via the ptrace
21 * interface, allowing the layout of such register/state information to
22 * be modified in the kernel without affecting the debugger. Each
23 * register or state is identified using a 32-bit "libdb target number"
24 * assigned when the Xtensa processor is generated.
27 #include <linux/config.h>
28 #include <linux/linkage.h>
29 #include <asm/processor.h>
33 #define CP_LAST ((XCHAL_CP_MAX - 1) * COPROCESSOR_INFO_SIZE)
35 ENTRY(release_coprocessors)
39 movi a3, 1 << XCHAL_CP_MAX # a3: coprocessor-bit
40 movi a4, coprocessor_info+CP_LAST # a4: owner-table
43 rsil a7, LOCKLEVEL # a7: PS
45 1: /* Check if task is coprocessor owner of coprocessor[i]. */
47 l32i a5, a4, COPROCESSOR_INFO_OWNER
53 /* Found an entry: Clear entry CPENABLE bit to disable CP. */
56 s32i a6, a4, COPROCESSOR_INFO_OWNER
67 ENTRY(disable_coprocessor)
81 ENTRY(enable_coprocessor)
96 ENTRY(save_coprocessor_extra)
98 xchal_extra_store_funcbody
101 ENTRY(restore_coprocessor_extra)
103 xchal_extra_load_funcbody
106 ENTRY(save_coprocessor_registers)
108 xchal_cpi_store_funcbody
111 ENTRY(restore_coprocessor_registers)
113 xchal_cpi_load_funcbody
118 * The Xtensa compile-time HAL (core.h) XCHAL_*_SA_CONTENTS_LIBDB macros
119 * describe the contents of coprocessor & extra save areas in terms of
120 * undefined CONTENTS_LIBDB_{SREG,UREG,REGF} macros. We define these
121 * latter macros here; they expand into a table of the format we want.
122 * The general format is:
124 * CONTENTS_LIBDB_SREG(libdbnum, offset, size, align, rsv1, name, sregnum,
125 * bitmask, rsv2, rsv3)
126 * CONTENTS_LIBDB_UREG(libdbnum, offset, size, align, rsv1, name, uregnum,
127 * bitmask, rsv2, rsv3)
128 * CONTENTS_LIBDB_REGF(libdbnum, offset, size, align, rsv1, name, index,
129 * numentries, contentsize, regname_base,
130 * regfile_name, rsv2, rsv3)
132 * For this table, we only care about the <libdbnum>, <offset> and <size>
136 /* Map all XCHAL CONTENTS macros to the reg_entry asm macro defined below: */
138 #define CONTENTS_LIBDB_SREG(libdbnum,offset,size,align,rsv1,name,sregnum, \
139 bitmask, rsv2, rsv3) \
140 reg_entry libdbnum, offset, size ;
141 #define CONTENTS_LIBDB_UREG(libdbnum,offset,size,align,rsv1,name,uregnum, \
142 bitmask, rsv2, rsv3) \
143 reg_entry libdbnum, offset, size ;
144 #define CONTENTS_LIBDB_REGF(libdbnum, offset, size, align, rsv1, name, index, \
145 numentries, contentsize, regname_base, \
146 regfile_name, rsv2, rsv3) \
147 reg_entry libdbnum, offset, size ;
149 /* A single table entry: */
150 .macro reg_entry libdbnum, offset, size
151 .ifne (__last_offset-(__last_group_offset+\offset))
153 .word (0xFC000000+__last_offset-(__last_group_offset+\offset))
155 .word \libdbnum /* actual entry */
156 .set __last_offset, __last_group_offset+\offset+\size
157 .endm /* reg_entry */
160 /* Table entry that marks the beginning of a group (coprocessor or "extra"): */
161 .macro reg_group cpnum, num_entries, align
162 .set __last_group_offset, (__last_offset + \align- 1) & -\align
164 .word 0xFD000000+(\cpnum<<16)+\num_entries
166 .endm /* reg_group */
169 * Register info tables.
172 .section .rodata, "a"
173 .globl _xtensa_reginfo_tables
174 .globl _xtensa_reginfo_table_size
176 _xtensa_reginfo_table_size:
177 .word _xtensa_reginfo_table_end - _xtensa_reginfo_tables
179 _xtensa_reginfo_tables:
180 .set __last_offset, 0
181 reg_group 0xFF, XCHAL_EXTRA_SA_CONTENTS_LIBDB_NUM, XCHAL_EXTRA_SA_ALIGN
182 XCHAL_EXTRA_SA_CONTENTS_LIBDB
183 reg_group 0, XCHAL_CP0_SA_CONTENTS_LIBDB_NUM, XCHAL_CP0_SA_ALIGN
184 XCHAL_CP0_SA_CONTENTS_LIBDB
185 reg_group 1, XCHAL_CP1_SA_CONTENTS_LIBDB_NUM, XCHAL_CP1_SA_ALIGN
186 XCHAL_CP1_SA_CONTENTS_LIBDB
187 reg_group 2, XCHAL_CP2_SA_CONTENTS_LIBDB_NUM, XCHAL_CP2_SA_ALIGN
188 XCHAL_CP2_SA_CONTENTS_LIBDB
189 reg_group 3, XCHAL_CP3_SA_CONTENTS_LIBDB_NUM, XCHAL_CP3_SA_ALIGN
190 XCHAL_CP3_SA_CONTENTS_LIBDB
191 reg_group 4, XCHAL_CP4_SA_CONTENTS_LIBDB_NUM, XCHAL_CP4_SA_ALIGN
192 XCHAL_CP4_SA_CONTENTS_LIBDB
193 reg_group 5, XCHAL_CP5_SA_CONTENTS_LIBDB_NUM, XCHAL_CP5_SA_ALIGN
194 XCHAL_CP5_SA_CONTENTS_LIBDB
195 reg_group 6, XCHAL_CP6_SA_CONTENTS_LIBDB_NUM, XCHAL_CP6_SA_ALIGN
196 XCHAL_CP6_SA_CONTENTS_LIBDB
197 reg_group 7, XCHAL_CP7_SA_CONTENTS_LIBDB_NUM, XCHAL_CP7_SA_ALIGN
198 XCHAL_CP7_SA_CONTENTS_LIBDB
199 .word 0xFC000000 /* invalid register number,marks end of table*/
200 _xtensa_reginfo_table_end: