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Speed up register read. 

Don't scan an extra sequence just to read the return value.
__archive__
Tim Newsome 2016-06-21 11:33:53 -07:00
parent 27b94d36d0
commit 1fdcfa7082
1 changed files with 47 additions and 14 deletions
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61
src/target/riscv/riscv.c
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@ -406,6 +406,7 @@ static void cache_set(struct target *target, unsigned int index, uint32_t data)
info->dram_cache[index].data == data) {
// This is already preset on the target.
LOG_DEBUG("Cache hit at 0x%x for data 0x%x", index, data);
assert(dram_read32(target, index) == info->dram_cache[index].data);
return;
}
info->dram_cache[index].data = data;
@ -427,6 +428,30 @@ static void dump_debug_ram(struct target *target)
}
}
/* Call this if the code you just ran writes to debug RAM entries 0 through 3. */
static void cache_invalidate(struct target *target)
{
riscv_info_t *info = (riscv_info_t *) target->arch_info;
for (unsigned int i = 0; i < DRAM_CACHE_SIZE; i++) {
info->dram_cache[i].valid = false;
info->dram_cache[i].dirty = false;
}
}
/* Called by cache_write() after the program has run. Also call this if you're
* running programs without calling cache_write(). */
static void cache_clean(struct target *target)
{
riscv_info_t *info = (riscv_info_t *) target->arch_info;
for (unsigned int i = 0; i < DRAM_CACHE_SIZE; i++) {
if (i >= 4) {
info->dram_cache[i].valid = false;
} else {
info->dram_cache[i].dirty = false;
}
}
}
/** Write cache to the target, and optionally run the program. */
static int cache_write(struct target *target, unsigned int address, bool run)
{
@ -553,6 +578,7 @@ static int cache_write(struct target *target, unsigned int address, bool run)
}
info->dram_cache[i].dirty = false;
}
cache_clean(target);
if (wait_for_debugint_clear(target, true) != ERROR_OK) {
LOG_ERROR("Debug interrupt didn't clear.");
@ -561,6 +587,8 @@ static int cache_write(struct target *target, unsigned int address, bool run)
}
} else {
cache_clean(target);
int interrupt = buf_get_u32(in + 8*(scan-1), DBUS_DATA_START + 33, 1);
if (interrupt) {
info->interrupt_high_count++;
@ -570,14 +598,16 @@ static int cache_write(struct target *target, unsigned int address, bool run)
dump_debug_ram(target);
return ERROR_FAIL;
}
}
}
for (unsigned int i = 0; i < DRAM_CACHE_SIZE; i++) {
if (i >= 4) {
info->dram_cache[i].valid = false;
} else {
info->dram_cache[i].dirty = false;
// We read a useful value in that last scan.
unsigned int read_addr = buf_get_u32(in + 8*(scan-1), DBUS_ADDRESS_START, info->addrbits);
if (read_addr != address) {
LOG_INFO("Got data from 0x%x but expected it from 0x%x",
read_addr, address);
}
info->dram_cache[read_addr].data =
buf_get_u64(in + 8*(scan-1), DBUS_DATA_START, DBUS_DATA_SIZE);
info->dram_cache[read_addr].valid = true;
}
}
@ -586,14 +616,14 @@ static int cache_write(struct target *target, unsigned int address, bool run)
return ERROR_OK;
}
/* Call this if the code you just ran writes to debug RAM entries 0 through 3. */
static void cache_invalidate(struct target *target)
uint32_t cache_get32(struct target *target, unsigned int address)
{
riscv_info_t *info = (riscv_info_t *) target->arch_info;
for (unsigned int i = 0; i < DRAM_CACHE_SIZE; i++) {
info->dram_cache[i].valid = false;
info->dram_cache[i].dirty = false;
if (!info->dram_cache[address].valid) {
info->dram_cache[address].data = dram_read32(target, address);
info->dram_cache[address].valid = true;
}
return info->dram_cache[address].data;
}
#if 0
@ -820,9 +850,9 @@ static int register_get(struct reg *reg)
return ERROR_FAIL;
}
uint32_t value = dram_read32(target, 4);
uint32_t value = cache_get32(target, 4);
uint32_t exception = dram_read32(target, info->dramsize-1);
uint32_t exception = cache_get32(target, info->dramsize-1);
if (exception) {
LOG_ERROR("Got exception 0x%x when reading register %d", exception,
reg->number);
@ -1570,6 +1600,8 @@ static int riscv_write_memory(struct target *target, uint32_t address,
// batch.
LOG_INFO("Retrying memory write starting from 0x%x with more delays", address + size * i);
cache_clean(target);
if (write_gpr(target, T0, address + size * i) != ERROR_OK) {
goto error;
}
@ -1586,6 +1618,7 @@ static int riscv_write_memory(struct target *target, uint32_t address,
free(out);
free(field);
cache_clean(target);
return register_write(target, T0, t0);
error: