src/target/target_type.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifndef TARGET_TYPE_H
  27 #define TARGET_TYPE_H
  28
  29 #include <helper/types.h>
  30 #include <jim-nvp.h>
  31
  32 struct target;
  33
  34 /**
  35  * This holds methods shared between all instances of a given target
  36  * type.  For example, all Cortex-M3 targets on a scan chain share
  37  * the same method table.
  38  */
  39 struct target_type
  40 {
  41         /**
  42          * Name of this type of target.  Do @b not access this
  43          * field directly, use target_type_name() instead.
  44          */
  45         const char *name;
  46
  47         /* poll current target status */
  48         int (*poll)(struct target *target);
  49         /* Invoked only from target_arch_state().
  50          * Issue USER() w/architecture specific status.  */
  51         int (*arch_state)(struct target *target);
  52
  53         /* target request support */
  54         int (*target_request_data)(struct target *target, uint32_t size, uint8_t *buffer);
  55
  56         /* halt will log a warning, but return ERROR_OK if the target is already halted. */
  57         int (*halt)(struct target *target);
  58         int (*resume)(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution);
  59         int (*step)(struct target *target, int current, uint32_t address, int handle_breakpoints);
  60
  61         /* target reset control. assert reset can be invoked when OpenOCD and
  62          * the target is out of sync.
  63          *
  64          * A typical example is that the target was power cycled while OpenOCD
  65          * thought the target was halted or running.
  66          *
  67          * assert_reset() can therefore make no assumptions whatsoever about the
  68          * state of the target
  69          *
  70          * Before assert_reset() for the target is invoked, a TRST/tms and
  71          * chain validation is executed. TRST should not be asserted
  72          * during target assert unless there is no way around it due to
  73          * the way reset's are configured.
  74          *
  75          */
  76         int (*assert_reset)(struct target *target);
  77         /**
  78          * The implementation is responsible for polling the
  79          * target such that target->state reflects the
  80          * state correctly.
  81          *
  82          * Otherwise the following would fail, as there will not
  83          * be any "poll" invoked inbetween the "reset run" and
  84          * "halt".
  85          *
  86          * reset run; halt
  87      */
  88         int (*deassert_reset)(struct target *target);
  89         int (*soft_reset_halt_imp)(struct target *target);
  90         int (*soft_reset_halt)(struct target *target);
  91
  92         /**
  93          * Target register access for GDB.  Do @b not call this function
  94          * directly, use target_get_gdb_reg_list() instead.
  95          *
  96          * Danger! this function will succeed even if the target is running
  97          * and return a register list with dummy values.
  98          *
  99          * The reason is that GDB connection will fail without a valid register
 100          * list, however it is after GDB is connected that monitor commands can
 101          * be run to properly initialize the target
 102          */
 103         int (*get_gdb_reg_list)(struct target *target, struct reg **reg_list[], int *reg_list_size);
 104
 105         /* target memory access
 106         * size: 1 = byte (8bit), 2 = half-word (16bit), 4 = word (32bit)
 107         * count: number of items of <size>
 108         */
 109         int (*read_memory_imp)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 110         /**
 111          * Target memory read callback.  Do @b not call this function
 112          * directly, use target_read_memory() instead.
 113          */
 114         int (*read_memory)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 115         int (*write_memory_imp)(struct target *target, uint32_t address, uint32_t size, uint32_t count, const uint8_t *buffer);
 116         /**
 117          * Target memory write callback.  Do @b not call this function
 118          * directly, use target_write_memory() instead.
 119          */
 120         int (*write_memory)(struct target *target, uint32_t address, uint32_t size, uint32_t count, const uint8_t *buffer);
 121
 122         /* Default implementation will do some fancy alignment to improve performance, target can override */
 123         int (*read_buffer)(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer);
 124
 125         /* Default implementation will do some fancy alignment to improve performance, target can override */
 126         int (*write_buffer)(struct target *target, uint32_t address, uint32_t size, const uint8_t *buffer);
 127
 128         /**
 129          * Write target memory in multiples of 4 bytes, optimized for
 130          * writing large quantities of data.  Do @b not call this
 131          * function directly, use target_bulk_write_memory() instead.
 132          */
 133         int (*bulk_write_memory)(struct target *target, uint32_t address, uint32_t count, const uint8_t *buffer);
 134
 135         int (*checksum_memory)(struct target *target, uint32_t address, uint32_t count, uint32_t* checksum);
 136         int (*blank_check_memory)(struct target *target, uint32_t address, uint32_t count, uint32_t* blank);
 137
 138         /*
 139          * target break-/watchpoint control
 140          * rw: 0 = write, 1 = read, 2 = access
 141          *
 142          * Target must be halted while this is invoked as this
 143          * will actually set up breakpoints on target.
 144          *
 145          * The breakpoint hardware will be set up upon adding the
 146          * first breakpoint.
 147          *
 148          * Upon GDB connection all breakpoints/watchpoints are cleared.
 149          */
 150         int (*add_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 151         int (*add_context_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 152         int (*add_hybrid_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 153
 154         /* remove breakpoint. hw will only be updated if the target
 155          * is currently halted.
 156          * However, this method can be invoked on unresponsive targets.
 157          */
 158         int (*remove_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 159
 160         /* add watchpoint ... see add_breakpoint() comment above. */
 161         int (*add_watchpoint)(struct target *target, struct watchpoint *watchpoint);
 162
 163         /* remove watchpoint. hw will only be updated if the target
 164          * is currently halted.
 165          * However, this method can be invoked on unresponsive targets.
 166          */
 167         int (*remove_watchpoint)(struct target *target, struct watchpoint *watchpoint);
 168
 169         /**
 170          * Target algorithm support.  Do @b not call this method directly,
 171          * use target_run_algorithm() instead.
 172          */
 173         int (*run_algorithm)(struct target *target, int num_mem_params, struct mem_param *mem_params, int num_reg_params, struct reg_param *reg_param, uint32_t entry_point, uint32_t exit_point, int timeout_ms, void *arch_info);
 174
 175         const struct command_registration *commands;
 176
 177         /* called when target is created */
 178         int (*target_create)(struct target *target, Jim_Interp *interp);
 179
 180         /* called for various config parameters */
 181         /* returns JIM_CONTINUE - if option not understood */
 182         /* otherwise: JIM_OK, or JIM_ERR, */
 183         int (*target_jim_configure)(struct target *target, Jim_GetOptInfo *goi);
 184
 185         /* target commands specifically handled by the target */
 186         /* returns JIM_OK, or JIM_ERR, or JIM_CONTINUE - if option not understood */
 187         int (*target_jim_commands)(struct target *target, Jim_GetOptInfo *goi);
 188
 189         /**
 190          * This method is used to perform target setup that requires
 191          * JTAG access.
 192          *
 193          * This may be called multiple times.  It is called after the
 194          * scan chain is initially validated, or later after the target
 195          * is enabled by a JRC.  It may also be called during some
 196          * parts of the reset sequence.
 197          *
 198          * For one-time initialization tasks, use target_was_examined()
 199          * and target_set_examined().  For example, probe the hardware
 200          * before setting up chip-specific state, and then set that
 201          * flag so you don't do that again.
 202          */
 203         int (*examine)(struct target *target);
 204
 205         /* Set up structures for target.
 206          *
 207          * It is illegal to talk to the target at this stage as this fn is invoked
 208          * before the JTAG chain has been examined/verified
 209          * */
 210         int (*init_target)(struct command_context *cmd_ctx, struct target *target);
 211
 212         /* translate from virtual to physical address. Default implementation is successful
 213          * no-op(i.e. virtual==physical).
 214          */
 215         int (*virt2phys)(struct target *target, uint32_t address, uint32_t *physical);
 216
 217         /* read directly from physical memory. caches are bypassed and untouched.
 218          *
 219          * If the target does not support disabling caches, leaving them untouched,
 220          * then minimally the actual physical memory location will be read even
 221          * if cache states are unchanged, flushed, etc.
 222          *
 223          * Default implementation is to call read_memory.
 224          */
 225         int (*read_phys_memory)(struct target *target, uint32_t phys_address, uint32_t size, uint32_t count, uint8_t *buffer);
 226
 227         /*
 228          * same as read_phys_memory, except that it writes...
 229          */
 230         int (*write_phys_memory)(struct target *target, uint32_t phys_address, uint32_t size, uint32_t count, const uint8_t *buffer);
 231
 232         int (*mmu)(struct target *target, int *enabled);
 233
 234         /* after reset is complete, the target can check if things are properly set up.
 235          *
 236          * This can be used to check if e.g. DCC memory writes have been enabled for
 237          * arm7/9 targets, which they really should except in the most contrived
 238          * circumstances.
 239          */
 240         int (*check_reset)(struct target *target);
 241 };
 242
 243 #endif // TARGET_TYPE_H