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vbe: Support selecting operations by SPL phase

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VBE supports booting firmware during the SPL phases, i.e. so that VPL can
start SPL and SPL can start U-Boot.

It also supports booting an OS, when in U-Boot.

As a first step towards these features, add functions to indicate the
current VBE phase. The firmware selection is done in VPL and the OS
selection is done in U-Boot proper.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2022-10-20 18:23:09 -06:00 committed by Tom Rini
parent f1459c3657
commit 70b26e4356
1 changed files with 28 additions and 0 deletions
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28
include/vbe.h
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@ -10,6 +10,34 @@
#ifndef __VBE_H
#define __VBE_H
/**
* enum vbe_phase_t - current phase of VBE
*
* VBE operates in two distinct phases. In VPL it has to choose which firmware
* to run (SPL, U-Boot, OP-TEE, etc.). It then carries on running until it gets
* to U-Boot, where it decides which OS to run
*
* @VBE_PHASE_FIRMWARE: Selecting the firmware to run
* @VBE_PHASE_OS: Selecting the Operating System to run
*/
enum vbe_phase_t {
VBE_PHASE_FIRMWARE,
VBE_PHASE_OS,
};
/**
* vbe_phase() - get current VBE phase
*
* Returns: Current VBE phase
*/
static inline enum vbe_phase_t vbe_phase(void)
{
if (IS_ENABLED(CONFIG_SPL_BUILD))
return VBE_PHASE_FIRMWARE;
return VBE_PHASE_OS;
}
/**
* vbe_list() - List the VBE bootmeths
*