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efi_loader: implement task priority level (TPL)

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Define variable holding tpl.
Implement RaiseTPL and RestoreTPL.
Implement TPL check in efi_signal_event.
Implement TPL check in efi_wait_for_event.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2017-09-15 10:06:16 +02:00 committed by Alexander Graf
parent bd126692da
commit 32f4b2f8c4
1 changed files with 28 additions and 4 deletions
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32
lib/efi_loader/efi_boottime.c
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@ -18,6 +18,9 @@
DECLARE_GLOBAL_DATA_PTR;
/* Task priority level */
static UINTN efi_tpl = TPL_APPLICATION;
/* This list contains all the EFI objects our payload has access to */
LIST_HEAD(efi_obj_list);
@ -161,7 +164,9 @@ void efi_signal_event(struct efi_event *event)
{
if (event->notify_function) {
event->queued = 1;
/* Put missing TPL check here */
/* Check TPL */
if (efi_tpl >= event->notify_tpl)
return;
EFI_CALL_VOID(event->notify_function(event,
event->notify_context));
}
@ -176,14 +181,31 @@ static efi_status_t efi_unsupported(const char *funcname)
static unsigned long EFIAPI efi_raise_tpl(UINTN new_tpl)
{
UINTN old_tpl = efi_tpl;
EFI_ENTRY("0x%zx", new_tpl);
return EFI_EXIT(0);
if (new_tpl < efi_tpl)
debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
efi_tpl = new_tpl;
if (efi_tpl > TPL_HIGH_LEVEL)
efi_tpl = TPL_HIGH_LEVEL;
EFI_EXIT(EFI_SUCCESS);
return old_tpl;
}
static void EFIAPI efi_restore_tpl(UINTN old_tpl)
{
EFI_ENTRY("0x%zx", old_tpl);
efi_unsupported(__func__);
if (old_tpl > efi_tpl)
debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
efi_tpl = old_tpl;
if (efi_tpl > TPL_HIGH_LEVEL)
efi_tpl = TPL_HIGH_LEVEL;
EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
@ -388,7 +410,9 @@ static efi_status_t EFIAPI efi_wait_for_event(unsigned long num_events,
/* Check parameters */
if (!num_events || !event)
return EFI_EXIT(EFI_INVALID_PARAMETER);
/* Put missing TPL check here */
/* Check TPL */
if (efi_tpl != TPL_APPLICATION)
return EFI_EXIT(EFI_UNSUPPORTED);
for (i = 0; i < num_events; ++i) {
for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
if (event[i] == &efi_events[j])