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lib: uefi: runtime_service_provider.cpp: implement Get/SetVariable

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GBL debug target will use GetVariable to get a variable called
gbl_debug. If the variable exists, it waits for the gdb to be started.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org>
This commit is contained in:
Ying-Chun Liu (PaulLiu)
2025-08-11 16:24:35 +01:00
committed by Kelvin Zhang
parent 45d7da5640
commit 17dc5cd0aa
1 changed files with 39 additions and 1 deletions
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40
lib/uefi/runtime_service_provider.cpp
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@@ -22,12 +22,19 @@
#include <string.h>
#include <uefi/types.h>
#include "variable_mem.h"
namespace {
constexpr auto &&kSecureBoot = "SecureBoot";
EFI_STATUS GetVariable(char16_t *VariableName, EfiGuid *VendorGuid,
uint32_t *Attributes, size_t *DataSize, void *Data) {
if (!VariableName || !VendorGuid || !DataSize) {
return INVALID_PARAMETER;
}
char buffer[512];
size_t i = 0;
while (VariableName[i] && i < sizeof(buffer)) {
@@ -48,6 +55,21 @@ EFI_STATUS GetVariable(char16_t *VariableName, EfiGuid *VendorGuid,
return SUCCESS;
}
char *data_in_mem;
size_t data_in_mem_size;
if (efi_get_variable(VariableName, VendorGuid, Attributes, &data_in_mem, &data_in_mem_size) == SUCCESS) {
if (*DataSize == 0 && !Data) {
*DataSize = data_in_mem_size;
return BUFFER_TOO_SMALL;
}
if (data_in_mem_size > *DataSize) {
return BUFFER_TOO_SMALL;
}
*DataSize = data_in_mem_size;
memcpy(Data, data_in_mem, data_in_mem_size);
return SUCCESS;
}
printf("%s(%s) is unsupported\n", __FUNCTION__, buffer);
return UNSUPPORTED;
}
@@ -61,7 +83,23 @@ EFI_STATUS SetVirtualAddressMap(size_t MemoryMapSize, size_t DescriptorSize,
EFI_STATUS SetVariable(char16_t *VariableName, EfiGuid *VendorGuid,
uint32_t Attributes, size_t DataSize, void *Data) {
printf("%s is unsupported\n", __FUNCTION__);
if (!VariableName || VariableName[0] == 0) {
return INVALID_PARAMETER;
}
/* Only allow setting non-volatile variables */
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
efi_set_variable(VariableName,
VendorGuid,
Attributes,
reinterpret_cast<const char *>(Data),
DataSize);
return SUCCESS;
}
printf("%s: Only non-volatile is supported. Attributes = 0x%x\n",
__FUNCTION__,
Attributes);
return UNSUPPORTED;
}