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x86: fsp: Add access to variable MRC data

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With FSP2 the non-volatile storage used by the FSP to init memory can be
split into a fixed piece (determined at compile time) and a variable piece
(determined at run time). Add support for reading the latter.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-09-25 08:11:34 -06:00 committed by Bin Meng
parent ceec18491c
commit 46dd41fa5a
3 changed files with 23 additions and 0 deletions
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4
arch/x86/include/asm/fsp/fsp_hob.h
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@ -69,6 +69,10 @@ struct __packed hob_graphics_info {
EFI_GUID(0x721acf02, 0x4d77, 0x4c2a, \
0xb3, 0xdc, 0x27, 0x0b, 0x7b, 0xa9, 0xe4, 0xb0)
#define FSP_VARIABLE_NV_DATA_HOB_GUID \
EFI_GUID(0xa034147d, 0x690c, 0x4154, \
0x8d, 0xe6, 0xc0, 0x44, 0x64, 0x1d, 0xe9, 0x42)
#define FSP_BOOTLOADER_TEMP_MEM_HOB_GUID \
EFI_GUID(0xbbcff46c, 0xc8d3, 0x4113, \
0x89, 0x85, 0xb9, 0xd4, 0xf3, 0xb3, 0xf6, 0x4e)

12
arch/x86/include/asm/fsp/fsp_support.h
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@ -103,6 +103,18 @@ u32 fsp_get_tseg_reserved_mem(const void *hob_list, u32 *len);
*/
void *fsp_get_nvs_data(const void *hob_list, u32 *len);
/**
* fsp_get_var_nvs_data() - get FSP variable Non-volatile Storage HOB buffer
*
* @hob_list: A HOB list pointer.
* @len: A pointer to the NVS data buffer length.
* If the HOB is located, the length will be updated.
*
* @return NULL: Failed to find the NVS HOB.
* @return others: FSP NVS data buffer pointer.
*/
void *fsp_get_var_nvs_data(const void *hob_list, u32 *len);
/**
* fsp_get_graphics_info() - retrieves graphics information.
*

7
arch/x86/lib/fsp/fsp_support.c
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@ -161,6 +161,13 @@ void *fsp_get_nvs_data(const void *hob_list, u32 *len)
return hob_get_guid_hob_data(hob_list, len, &guid);
}
void *fsp_get_var_nvs_data(const void *hob_list, u32 *len)
{
const efi_guid_t guid = FSP_VARIABLE_NV_DATA_HOB_GUID;
return hob_get_guid_hob_data(hob_list, len, &guid);
}
void *fsp_get_bootloader_tmp_mem(const void *hob_list, u32 *len)
{
const efi_guid_t guid = FSP_BOOTLOADER_TEMP_MEM_HOB_GUID;