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efi: Update some comments related to smbios tables

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Clarify the operation of this code with some additional comments.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Simon Glass 2018-05-16 09:42:19 -06:00 • committed by Alexander Graf
parent 85b469215f
commit 0864c565a2
3 changed files with 16 additions and 3 deletions
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7
include/efi_loader.h
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@ -214,6 +214,13 @@ efi_status_t efi_net_register(void);
/* Called by bootefi to make the watchdog available */ /* Called by bootefi to make the watchdog available */
efi_status_t efi_watchdog_register(void); efi_status_t efi_watchdog_register(void);
/* Called by bootefi to make SMBIOS tables available */ /* Called by bootefi to make SMBIOS tables available */
/**
* efi_smbios_register() - write out SMBIOS tables
*
* Called by bootefi to make SMBIOS tables available
*
* @return 0 if OK, -ENOMEM if no memory is available for the tables
*/
efi_status_t efi_smbios_register(void); efi_status_t efi_smbios_register(void);
struct efi_simple_file_system_protocol * struct efi_simple_file_system_protocol *

5
include/smbios.h
View file

@ -231,8 +231,9 @@ typedef int (*smbios_write_type)(ulong *addr, int handle);
* *
* This writes SMBIOS table at a given address. * This writes SMBIOS table at a given address.
* *
* @addr: start address to write SMBIOS table * @addr: start address to write SMBIOS table. If this is not
* @return: end address of SMBIOS table * 16-byte-aligned then it will be aligned before the table is written
* @return: end address of SMBIOS table (and start address for next entry)
*/ */
ulong write_smbios_table(ulong addr); ulong write_smbios_table(ulong addr);

7
lib/efi_loader/efi_smbios.c
View file

@ -29,7 +29,12 @@ efi_status_t efi_smbios_register(void)
if (ret != EFI_SUCCESS) if (ret != EFI_SUCCESS)
return ret; return ret;
/* Generate SMBIOS tables */ /*
* Generate SMBIOS tables - we know that efi_allocate_pages() returns
* a 4k-aligned address, so it is safe to assume that
* write_smbios_table() will write the table at that address.
*/
assert(!(dmi & 0xf));
write_smbios_table(dmi); write_smbios_table(dmi);
/* And expose them to our EFI payload */ /* And expose them to our EFI payload */