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ofnvram: implement changing of string variables.

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This commit is contained in:
Maxim Poliakovski 2022-04-06 11:14:39 +02:00
parent f6e5d72e3c
commit 883aac2d05
2 changed files with 82 additions and 23 deletions
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99
devices/common/ofnvram.cpp
View File

@ -117,26 +117,26 @@ static const string flag_names[8] = {
};
static const map<string, std::tuple<int, uint16_t>> of_vars = {
// name, type, offset
{"real-base", {1, 0x10}},
{"real-size", {1, 0x14}},
{"virt-base", {1, 0x18}},
{"virt-size", {1, 0x1C}},
{"load-base", {1, 0x20}},
{"pci-probe-list", {1, 0x24}},
{"screen-#columns", {1, 0x28}},
{"screen-#rows", {1, 0x2C}},
{"selftest-#megs", {1, 0x30}},
{"boot-device", {2, 0x34}},
{"boot-file", {2, 0x38}},
{"diag-device", {2, 0x3C}},
{"diag-file", {2, 0x40}},
{"input-device", {2, 0x44}},
{"output-device", {2, 0x48}},
{"oem-banner", {2, 0x4C}},
{"oem-logo", {2, 0x50}},
{"nvramrc", {2, 0x54}},
{"boot-command", {2, 0x58}},
// name, type, offset
{"real-base", {OF_VAR_TYPE_INT, 0x10}},
{"real-size", {OF_VAR_TYPE_INT, 0x14}},
{"virt-base", {OF_VAR_TYPE_INT, 0x18}},
{"virt-size", {OF_VAR_TYPE_INT, 0x1C}},
{"load-base", {OF_VAR_TYPE_INT, 0x20}},
{"pci-probe-list", {OF_VAR_TYPE_INT, 0x24}},
{"screen-#columns", {OF_VAR_TYPE_INT, 0x28}},
{"screen-#rows", {OF_VAR_TYPE_INT, 0x2C}},
{"selftest-#megs", {OF_VAR_TYPE_INT, 0x30}},
{"boot-device", {OF_VAR_TYPE_STR, 0x34}},
{"boot-file", {OF_VAR_TYPE_STR, 0x38}},
{"diag-device", {OF_VAR_TYPE_STR, 0x3C}},
{"diag-file", {OF_VAR_TYPE_STR, 0x40}},
{"input-device", {OF_VAR_TYPE_STR, 0x44}},
{"output-device", {OF_VAR_TYPE_STR, 0x48}},
{"oem-banner", {OF_VAR_TYPE_STR, 0x4C}},
{"oem-logo", {OF_VAR_TYPE_STR, 0x50}},
{"nvramrc", {OF_VAR_TYPE_STR, 0x54}},
{"boot-command", {OF_VAR_TYPE_STR, 0x58}},
};
void OfNvramUtils::printenv()
@ -166,10 +166,10 @@ void OfNvramUtils::printenv()
cout << setw(20) << left << var.first;
switch (type) {
case 1: // integer
case OF_VAR_TYPE_INT:
cout << hex << READ_DWORD_BE_A(&this->buf[offset]) << endl;
break;
case 2: // string
case OF_VAR_TYPE_STR:
uint16_t str_offset = READ_WORD_BE_A(&this->buf[offset]) - OF_NVRAM_OFFSET;
uint16_t str_len = READ_WORD_BE_A(&this->buf[offset+2]);
if (str_len) {
@ -193,6 +193,7 @@ void OfNvramUtils::setenv(string var_name, string value)
return;
}
// check if the user tries to change a flag
for (i = 0; i < 8; i++) {
if (var_name == flag_names[i]) {
if (value == "true")
@ -218,5 +219,57 @@ void OfNvramUtils::setenv(string var_name, string value)
}
}
cout << "Changing of properties not supported yet" << endl;
// see if one of the stanard properties should be changed
if (of_vars.find(var_name) == of_vars.end()) {
cout << "Attempt to change unknown variable " << var_name << endl;
return;
}
auto type = std::get<0>(of_vars.at(var_name));
auto offset = std::get<1>(of_vars.at(var_name));
if (type == OF_VAR_TYPE_INT) {
cout << "Changing of integer variables not supported yet" << endl;
} else {
uint16_t str_len = READ_WORD_BE_A(&this->buf[offset+2]);
if (value.length() > str_len) {
// we're going to allocate additional space
// for the new string in the heap between here and top.
// TODO: implement removal of dead strings and heap compaction
OfNvramHdr *hdr = (OfNvramHdr *)&this->buf[0];
uint16_t here = READ_WORD_BE_A(&hdr->here);
uint16_t top = READ_WORD_BE_A(&hdr->top);
// check if there is enough space in the heap for the new string
if ((top - value.length()) < here) {
cout << "No room in the heap!" << endl;
return;
}
// allocate required space by lowering top
top -= value.length();
i = 0;
// copy new string into NVRAM buffer char by char
for(char& ch : value) {
this->buf[top + i - OF_NVRAM_OFFSET] = ch;
i++;
}
// stuff new values into the variable state
WRITE_WORD_BE_A(&this->buf[offset+0], top);
WRITE_WORD_BE_A(&this->buf[offset+2], value.length());
// update partition header
WRITE_WORD_BE_A(&hdr->top, top);
// update physical NVRAM
this->update_partition();
cout << " ok" << endl; // mimic Forth
return;
} else {
// TODO: replace existing string
}
}
}

6
devices/common/ofnvram.h
View File

@ -29,6 +29,12 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#define OF_NVRAM_OFFSET 0x1800
#define OF_NVRAM_SIG 0x1275
// OF Variable types
enum {
OF_VAR_TYPE_INT = 1,
OF_VAR_TYPE_STR = 2,
};
typedef struct {
uint16_t sig; // partition signature (= 0x1275)
uint8_t version; // header version