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Add EVT_RESERVE_BOARD event for custom memory reservation

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Add a new EVT_RESERVE_BOARD event that is triggered immediately after
the reserve_board() initcall completes during pre-relocation init. This
allows board or application code to reserve additional memory before
other reservations (global_data, fdt, etc).

The event is placed after EVT_FSP_INIT_F in the event enumeration and
is triggered in board_f.c right after the reserve_board initcall.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-11-01 18:20:56 +01:00
parent eb8db20b2e
commit f81821c7f5
3 changed files with 34 additions and 0 deletions
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11
common/board_f.c
View File

@@ -533,6 +533,9 @@ static int reserve_malloc(void)
/* (permanently) allocate a Board Info struct */
static int reserve_board(void)
{
struct event_reserve_board reserve;
int ret;
if (!gd->bd) {
gd->start_addr_sp = reserve_stack_aligned(sizeof(struct bd_info));
gd->bd = (struct bd_info *)map_sysmem(gd->start_addr_sp,
@@ -541,6 +544,14 @@ static int reserve_board(void)
debug("Reserving %zu Bytes for Board Info at: %08lx\n",
sizeof(struct bd_info), gd->start_addr_sp);
}
/* Allow board/app code to reserve additional memory */
reserve.start_addr_sp = gd->start_addr_sp;
ret = event_notify_resp(EVT_RESERVE_BOARD, &reserve, sizeof(reserve));
if (ret)
return log_msg_ret("res", ret);
gd->start_addr_sp = reserve.start_addr_sp;
return 0;
}

1
common/event.c
View File

@@ -37,6 +37,7 @@ const char *const type_name[] = {
/* init hooks */
"misc_init_f",
"fsp_init_r",
"reserve_board",
"settings_r",
"last_stage_init",

22
include/event.h
View File

@@ -105,6 +105,16 @@ enum event_t {
*/
EVT_FSP_INIT_F,
/**
* @EVT_RESERVE_BOARD:
* This event is triggered immediately after reserve_board() completes
* during pre-relocation init. It allows board or application code to
* reserve additional memory before other reservations.
* A non-zero return code from the event spy causes the boot process
* to fail.
*/
EVT_RESERVE_BOARD,
/**
* @EVT_SETTINGS_R:
* This event is triggered post-relocation and before console init.
@@ -292,6 +302,18 @@ union event_data {
char *bootcmd;
int size;
} bootcmd;
/**
* struct event_reserve_board - memory reservation event
*
* This is used for EVT_RESERVE_BOARD
*
* @start_addr_sp: On entry, current stack pointer for reservations;
* on exit, updated stack pointer after any additional reservations
*/
struct event_reserve_board {
ulong start_addr_sp;
} reserve_board;
};
/**