| Message ID | 20181128060059.5508-3-takahiro.akashi@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | efi_loader: non-volatile variables support | expand |
On 11/28/18 7:00 AM, AKASHI Takahiro wrote: > With -nv specified, a variable to be created will have NON_VOLATILE > attribute. > > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Why would we only make the NON_VOLATILE attribute available and not all the other attributes like EFI_VARIABLE_BOOTSERVICE_ACCESS? Where is the patch that ensures that non-volatile variables are not stored? Currently we do not make EFI variables available to the operating system so they are not really of much use. Best regards Heinrich > --- > cmd/efishell.c | 17 +++++++++++++---- > 1 file changed, 13 insertions(+), 4 deletions(-) > > diff --git a/cmd/efishell.c b/cmd/efishell.c > index 7cd3ca489559..7cdff757b06c 100644 > --- a/cmd/efishell.c > +++ b/cmd/efishell.c > @@ -249,11 +249,22 @@ static int _do_efi_set_var(int argc, char * const argv[]) > unsigned long size = 0; > u16 *var_name16, *p; > efi_guid_t guid; > + u32 attributes; > efi_status_t ret; > > if (argc == 1) > return CMD_RET_SUCCESS; > > + attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | > + EFI_VARIABLE_RUNTIME_ACCESS; > + if (!strcmp(argv[1], "-nv")) { > + attributes |= EFI_VARIABLE_NON_VOLATILE; > + argc--; > + argv++; > + if (argc == 1) > + return CMD_RET_SUCCESS; > + } > + > var_name = argv[1]; > if (argc == 2) { > /* remove */ > @@ -275,9 +286,7 @@ static int _do_efi_set_var(int argc, char * const argv[]) > utf8_utf16_strncpy(&p, var_name, strlen(var_name) + 1); > > guid = efi_global_variable_guid; > - ret = efi_set_variable(var_name16, &guid, > - EFI_VARIABLE_BOOTSERVICE_ACCESS | > - EFI_VARIABLE_RUNTIME_ACCESS, size, value); > + ret = efi_set_variable(var_name16, &guid, attributes, size, value); > ret = (ret == EFI_SUCCESS ? CMD_RET_SUCCESS : CMD_RET_FAILURE); > out: > return ret; > @@ -978,7 +987,7 @@ static char efishell_help_text[] = > "\n" > "efishell dumpvar [<name>]\n" > " - get uefi variable's value\n" > - "efishell setvar <name> [<value>]\n" > + "efishell setvar [-nv] <name> [<value>]\n" > " - set/delete uefi variable's value\n" > " <value> may be \"=\"...\"\", \"=0x...\" (set) or \"=\" (delete)\n" > "efishell devices\n" >
diff --git a/cmd/efishell.c b/cmd/efishell.c index 7cd3ca489559..7cdff757b06c 100644 --- a/cmd/efishell.c +++ b/cmd/efishell.c @@ -249,11 +249,22 @@ static int _do_efi_set_var(int argc, char * const argv[]) unsigned long size = 0; u16 *var_name16, *p; efi_guid_t guid; + u32 attributes; efi_status_t ret; if (argc == 1) return CMD_RET_SUCCESS; + attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS; + if (!strcmp(argv[1], "-nv")) { + attributes |= EFI_VARIABLE_NON_VOLATILE; + argc--; + argv++; + if (argc == 1) + return CMD_RET_SUCCESS; + } + var_name = argv[1]; if (argc == 2) { /* remove */ @@ -275,9 +286,7 @@ static int _do_efi_set_var(int argc, char * const argv[]) utf8_utf16_strncpy(&p, var_name, strlen(var_name) + 1); guid = efi_global_variable_guid; - ret = efi_set_variable(var_name16, &guid, - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS, size, value); + ret = efi_set_variable(var_name16, &guid, attributes, size, value); ret = (ret == EFI_SUCCESS ? CMD_RET_SUCCESS : CMD_RET_FAILURE); out: return ret; @@ -978,7 +987,7 @@ static char efishell_help_text[] = "\n" "efishell dumpvar [<name>]\n" " - get uefi variable's value\n" - "efishell setvar <name> [<value>]\n" + "efishell setvar [-nv] <name> [<value>]\n" " - set/delete uefi variable's value\n" " <value> may be \"=\"...\"\", \"=0x...\" (set) or \"=\" (delete)\n" "efishell devices\n"
With -nv specified, a variable to be created will have NON_VOLATILE attribute. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> --- cmd/efishell.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)