soc/amd/common/psp_smm: add/improve comments to buffers and flags
Since it's not exactly obvious what 'c2p_buffer', 'p2c_buffer' and 'smm_flag' are used for, add comments to those. Signed-off-by: Felix Held <felix-coreboot@felixheld.de> Change-Id: I4ec092a92fe9f0686ffb7103e441802fc05381f4 Reviewed-on: https://review.coreboot.org/c/coreboot/+/83698 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
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@@ -14,15 +14,28 @@
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#define C2P_BUFFER_MAXSIZE 0xc00 /* Core-to-PSP buffer */
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#define P2C_BUFFER_MAXSIZE 0xc00 /* PSP-to-core buffer */
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/*
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* When sending PSP mailbox commands to the PSP from the SMI handler after the boot done
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* command was sent, the corresponding data buffer needs to be placed in this core to PSP (C2P)
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* buffer.
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*/
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struct {
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u8 buffer[C2P_BUFFER_MAXSIZE];
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} __aligned(32) c2p_buffer;
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/*
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* When the PSP sends mailbox commands to the host, it will update the PSP to core (P2C) buffer
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* and then send an SMI to the host to process the request.
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*/
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struct {
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u8 buffer[P2C_BUFFER_MAXSIZE];
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} __aligned(32) p2c_buffer;
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static uint32_t smm_flag; /* Non-zero for SMM, clear when not */
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/*
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* When sending PSP mailbox commands to the PSP from the SMI handler, the SMM flag needs to be
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* set for the PSP to accept it. Otherwise it should be cleared.
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*/
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static uint32_t smm_flag;
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static void set_smm_flag(void)
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{
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