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target: allow targets to override memory alignment

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Targets can implement read/write_buffer to handle
alignment.
This commit is contained in:
Mathias K 2011-03-03 11:01:46 +01:00 committed by Øyvind Harboe
parent 9f17b30f88
commit 4332bc32e4
2 changed files with 32 additions and 4 deletions
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30
src/target/target.c
View File

@ -46,6 +46,10 @@
#include "image.h"
static int target_read_buffer_default(struct target *target, uint32_t address,
uint32_t size, uint8_t *buffer);
static int target_write_buffer_default(struct target *target, uint32_t address,
uint32_t size, uint8_t *buffer);
static int target_array2mem(Jim_Interp *interp, struct target *target,
int argc, Jim_Obj *const *argv);
static int target_mem2array(Jim_Interp *interp, struct target *target,
@ -865,6 +869,13 @@ static int target_init_one(struct command_context *cmd_ctx,
type->read_phys_memory = type->read_memory;
type->virt2phys = identity_virt2phys;
}
if (target->type->read_buffer == NULL)
target->type->read_buffer = target_read_buffer_default;
if (target->type->write_buffer == NULL)
target->type->write_buffer = target_write_buffer_default;
return ERROR_OK;
}
@ -1333,7 +1344,6 @@ int target_arch_state(struct target *target)
*/
int target_write_buffer(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer)
{
int retval;
LOG_DEBUG("writing buffer of %i byte at 0x%8.8x",
(int)size, (unsigned)address);
@ -1356,6 +1366,13 @@ int target_write_buffer(struct target *target, uint32_t address, uint32_t size,
return ERROR_FAIL;
}
return target->type->write_buffer(target, address, size, buffer);
}
static int target_write_buffer_default(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer)
{
int retval = ERROR_OK;
if (((address % 2) == 0) && (size == 2))
{
return target_write_memory(target, address, 2, 1, buffer);
@ -1406,7 +1423,7 @@ int target_write_buffer(struct target *target, uint32_t address, uint32_t size,
return retval;
}
return ERROR_OK;
return retval;
}
/* Single aligned words are guaranteed to use 16 or 32 bit access
@ -1415,7 +1432,6 @@ int target_write_buffer(struct target *target, uint32_t address, uint32_t size,
*/
int target_read_buffer(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer)
{
int retval;
LOG_DEBUG("reading buffer of %i byte at 0x%8.8x",
(int)size, (unsigned)address);
@ -1438,6 +1454,13 @@ int target_read_buffer(struct target *target, uint32_t address, uint32_t size, u
return ERROR_FAIL;
}
return target->type->read_buffer(target, address, size, buffer);
}
static int target_read_buffer_default(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer)
{
int retval = ERROR_OK;
if (((address % 2) == 0) && (size == 2))
{
return target_read_memory(target, address, 2, 1, buffer);
@ -3695,7 +3718,6 @@ static Jim_Nvp nvp_config_opts[] = {
{ .name = "-variant", .value = TCFG_VARIANT },
{ .name = "-coreid", .value = TCFG_COREID },
{ .name = "-chain-position", .value = TCFG_CHAIN_POSITION },
{ .name = NULL, .value = -1 }
};

6
src/target/target_type.h
View File

@ -119,6 +119,12 @@ struct target_type
*/
int (*write_memory)(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
/* Default implementation will do some fancy alignment to improve performance, target can override */
int (*read_buffer)(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer);
/* Default implementation will do some fancy alignment to improve performance, target can override */
int (*write_buffer)(struct target *target, uint32_t address, uint32_t size, uint8_t *buffer);
/**
* Write target memory in multiples of 4 bytes, optimized for
* writing large quantities of data. Do @b not call this