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smmstore: Add a key/val store facility in flash, mediated through SMM

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It exposes an interface that is as generic as possible, so payloads
and/or kernels can use it for their data.

Change-Id: I9553922f9dfa60b9d4b3576973ad4b84d3fe2fb5
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/25182
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Patrick Georgi
2018-03-14 21:11:21 +01:00
parent 88607a4b10
commit 9360feaf51
6 changed files with 421 additions and 0 deletions
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26
src/soc/intel/common/block/smm/smihandler.c
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@@ -27,6 +27,7 @@
#include <intelblocks/pmclib.h>
#include <intelblocks/smihandler.h>
#include <intelblocks/uart.h>
#include <smmstore.h>
#include <soc/nvs.h>
#include <soc/pm.h>
#include <soc/gpio.h>
@@ -294,6 +295,27 @@ static void southbridge_smi_gsmi(
save_state_ops->set_reg(io_smi, RAX, ret);
}
static void southbridge_smi_store(
const struct smm_save_state_ops *save_state_ops)
{
u8 sub_command, ret;
void *io_smi;
uint32_t reg_ebx;
io_smi = find_save_state(save_state_ops, SMMSTORE_APM_CNT);
if (!io_smi)
return;
/* Command and return value in EAX */
sub_command = (save_state_ops->get_reg(io_smi, RAX) >> 8) & 0xff;
/* Parameter buffer in EBX */
reg_ebx = save_state_ops->get_reg(io_smi, RBX);
/* drivers/smmstore/smi.c */
ret = smmstore_exec(sub_command, (void *)reg_ebx);
save_state_ops->set_reg(io_smi, RAX, ret);
}
static void finalize(void)
{
static int finalize_done;
@@ -366,6 +388,10 @@ void smihandler_southbridge_apmc(
if (IS_ENABLED(CONFIG_ELOG_GSMI))
southbridge_smi_gsmi(save_state_ops);
break;
case SMMSTORE_APM_CNT:
if (IS_ENABLED(CONFIG_SMMSTORE))
southbridge_smi_store(save_state_ops);
break;
case APM_CNT_FINALIZE:
finalize();
break;