src/target/target_type.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008,2009 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
  31 struct target;
  32
  33 /**
  34  * This holds methods shared between all instances of a given target
  35  * type.  For example, all Cortex-M3 targets on a scan chain share
  36  * the same method table.
  37  */
  38 struct target_type
  39 {
  40         /**
  41          * Name of this type of target.  Do @b not access this
  42          * field directly, use target_type_name() instead.
  43          */
  44         char *name;
  45
  46         /* poll current target status */
  47         int (*poll)(struct target *target);
  48         /* Invoked only from target_arch_state().
  49          * Issue USER() w/architecture specific status.  */
  50         int (*arch_state)(struct target *target);
  51
  52         /* target request support */
  53         int (*target_request_data)(struct target *target, uint32_t size, uint8_t *buffer);
  54
  55         /* halt will log a warning, but return ERROR_OK if the target is already halted. */
  56         int (*halt)(struct target *target);
  57         int (*resume)(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution);
  58         int (*step)(struct target *target, int current, uint32_t address, int handle_breakpoints);
  59
  60         /* target reset control. assert reset can be invoked when OpenOCD and
  61          * the target is out of sync.
  62          *
  63          * A typical example is that the target was power cycled while OpenOCD
  64          * thought the target was halted or running.
  65          *
  66          * assert_reset() can therefore make no assumptions whatsoever about the
  67          * state of the target
  68          *
  69          * Before assert_reset() for the target is invoked, a TRST/tms and
  70          * chain validation is executed. TRST should not be asserted
  71          * during target assert unless there is no way around it due to
  72          * the way reset's are configured.
  73          *
  74          */
  75         int (*assert_reset)(struct target *target);
  76         int (*deassert_reset)(struct target *target);
  77         int (*soft_reset_halt_imp)(struct target *target);
  78         int (*soft_reset_halt)(struct target *target);
  79
  80         /**
  81          * Target register access for GDB.  Do @b not call this function
  82          * directly, use target_get_gdb_reg_list() instead.
  83          *
  84          * Danger! this function will succeed even if the target is running
  85          * and return a register list with dummy values.
  86          *
  87          * The reason is that GDB connection will fail without a valid register
  88          * list, however it is after GDB is connected that monitor commands can
  89          * be run to properly initialize the target
  90          */
  91         int (*get_gdb_reg_list)(struct target *target, struct reg **reg_list[], int *reg_list_size);
  92
  93         /* target memory access
  94         * size: 1 = byte (8bit), 2 = half-word (16bit), 4 = word (32bit)
  95         * count: number of items of <size>
  96         */
  97         int (*read_memory_imp)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
  98         /**
  99          * Target memory read callback.  Do @b not call this function
 100          * directly, use target_read_memory() instead.
 101          */
 102         int (*read_memory)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 103         int (*write_memory_imp)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 104         /**
 105          * Target memory write callback.  Do @b not call this function
 106          * directly, use target_write_memory() instead.
 107          */
 108         int (*write_memory)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 109
 110         /**
 111          * Write target memory in multiples of 4 bytes, optimized for
 112          * writing large quantities of data.  Do @b not call this
 113          * function directly, use target_bulk_write_memory() instead.
 114          */
 115         int (*bulk_write_memory)(struct target *target, uint32_t address, uint32_t count, uint8_t *buffer);
 116
 117         int (*checksum_memory)(struct target *target, uint32_t address, uint32_t count, uint32_t* checksum);
 118         int (*blank_check_memory)(struct target *target, uint32_t address, uint32_t count, uint32_t* blank);
 119
 120         /*
 121          * target break-/watchpoint control
 122          * rw: 0 = write, 1 = read, 2 = access
 123          *
 124          * Target must be halted while this is invoked as this
 125          * will actually set up breakpoints on target.
 126          *
 127          * The breakpoint hardware will be set up upon adding the
 128          * first breakpoint.
 129          *
 130          * Upon GDB connection all breakpoints/watchpoints are cleared.
 131          */
 132         int (*add_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 133
 134         /* remove breakpoint. hw will only be updated if the target
 135          * is currently halted.
 136          * However, this method can be invoked on unresponsive targets.
 137          */
 138         int (*remove_breakpoint)(struct target *target, struct breakpoint *breakpoint);
 139
 140         /* add watchpoint ... see add_breakpoint() comment above. */
 141         int (*add_watchpoint)(struct target *target, struct watchpoint *watchpoint);
 142
 143         /* remove watchpoint. hw will only be updated if the target
 144          * is currently halted.
 145          * However, this method can be invoked on unresponsive targets.
 146          */
 147         int (*remove_watchpoint)(struct target *target, struct watchpoint *watchpoint);
 148
 149         /**
 150          * Target algorithm support.  Do @b not call this method directly,
 151          * use target_run_algorithm() instead.
 152          */
 153         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);
 154
 155         const struct command_registration *commands;
 156
 157         /* called when target is created */
 158         int (*target_create)(struct target *target, Jim_Interp *interp);
 159
 160         /* called for various config parameters */
 161         /* returns JIM_CONTINUE - if option not understood */
 162         /* otherwise: JIM_OK, or JIM_ERR, */
 163         int (*target_jim_configure)(struct target *target, Jim_GetOptInfo *goi);
 164
 165         /* target commands specifically handled by the target */
 166         /* returns JIM_OK, or JIM_ERR, or JIM_CONTINUE - if option not understood */
 167         int (*target_jim_commands)(struct target *target, Jim_GetOptInfo *goi);
 168
 169         /**
 170          * This method is used to perform target setup that requires
 171          * JTAG access.
 172          *
 173          * This may be called multiple times.  It is called after the
 174          * scan chain is initially validated, or later after the target
 175          * is enabled by a JRC.  It may also be called during some
 176          * parts of the reset sequence.
 177          *
 178          * For one-time initialization tasks, use target_was_examined()
 179          * and target_set_examined().  For example, probe the hardware
 180          * before setting up chip-specific state, and then set that
 181          * flag so you don't do that again.
 182          */
 183         int (*examine)(struct target *target);
 184
 185         /* Set up structures for target.
 186          *
 187          * It is illegal to talk to the target at this stage as this fn is invoked
 188          * before the JTAG chain has been examined/verified
 189          * */
 190         int (*init_target)(struct command_context *cmd_ctx, struct target *target);
 191
 192         /* translate from virtual to physical address. Default implementation is successful
 193          * no-op(i.e. virtual==physical).
 194          */
 195         int (*virt2phys)(struct target *target, uint32_t address, uint32_t *physical);
 196
 197         /* read directly from physical memory. caches are bypassed and untouched.
 198          *
 199          * If the target does not support disabling caches, leaving them untouched,
 200          * then minimally the actual physical memory location will be read even
 201          * if cache states are unchanged, flushed, etc.
 202          *
 203          * Default implementation is to call read_memory.
 204          */
 205         int (*read_phys_memory)(struct target *target, uint32_t phys_address, uint32_t size, uint32_t count, uint8_t *buffer);
 206
 207         /*
 208          * same as read_phys_memory, except that it writes...
 209          */
 210         int (*write_phys_memory)(struct target *target, uint32_t phys_address, uint32_t size, uint32_t count, uint8_t *buffer);
 211
 212         int (*mmu)(struct target *target, int *enabled);
 213
 214         /* after reset is complete, the target can check if things are properly set up.
 215          *
 216          * This can be used to check if e.g. DCC memory writes have been enabled for
 217          * arm7/9 targets, which they really should except in the most contrived
 218          * circumstances.
 219          */
 220         int (*check_reset)(struct target *target);
 221 };
 222
 223 #endif // TARGET_TYPE_H