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efi: Pass boot services variable info to runtime code

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EFI variables can be flagged as being accessible only within boot services.
This makes it awkward for us to figure out how much space they use at
runtime. In theory we could figure this out by simply comparing the results
from QueryVariableInfo() to the space used by all of our variables, but
that fails if the platform doesn't garbage collect on every boot. Thankfully,
calling QueryVariableInfo() while still inside boot services gives a more
reliable answer. This patch passes that information from the EFI boot stub
up to the efi platform code.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matthew Garrett
2013-04-15 13:09:46 -07:00
committed by Matt Fleming
parent 0635eb8a54
commit cc5a080c5d
4 changed files with 76 additions and 0 deletions
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47
arch/x86/boot/compressed/eboot.c
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@@ -251,6 +251,51 @@ static void find_bits(unsigned long mask, u8 *pos, u8 *size)
*size = len;
}
static efi_status_t setup_efi_vars(struct boot_params *params)
{
struct setup_data *data;
struct efi_var_bootdata *efidata;
u64 store_size, remaining_size, var_size;
efi_status_t status;
if (!sys_table->runtime->query_variable_info)
return EFI_UNSUPPORTED;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;
status = efi_call_phys4(sys_table->runtime->query_variable_info,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS, &store_size,
&remaining_size, &var_size);
if (status != EFI_SUCCESS)
return status;
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, sizeof(*efidata), &efidata);
if (status != EFI_SUCCESS)
return status;
efidata->data.type = SETUP_EFI_VARS;
efidata->data.len = sizeof(struct efi_var_bootdata) -
sizeof(struct setup_data);
efidata->data.next = 0;
efidata->store_size = store_size;
efidata->remaining_size = remaining_size;
efidata->max_var_size = var_size;
if (data)
data->next = (unsigned long)efidata;
else
params->hdr.setup_data = (unsigned long)efidata;
}
static efi_status_t setup_efi_pci(struct boot_params *params)
{
efi_pci_io_protocol *pci;
@@ -1157,6 +1202,8 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
setup_graphics(boot_params);
setup_efi_vars(boot_params);
setup_efi_pci(boot_params);
status = efi_call_phys3(sys_table->boottime->allocate_pool,