c411051252
These are variables used by `systemd-analyze` and is useful for boot performance metrics.
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
#if defined (UEFI)
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#include <stdint.h>
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#include <stddef.h>
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#include <config.h>
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#include <sys/cpu.h>
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#include <efi.h>
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#include <lib/bli.h>
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#include <lib/guid.h>
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#include <lib/misc.h>
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#define LIMINE_BRAND L"Limine " LIMINE_VERSION
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static EFI_GUID bli_vendor_guid = { 0x4a67b082, 0x0a4c, 0x41cf, { 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f } };
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// The buffer must be at least 21 bytes long
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void uint64_to_decwstr(uint64_t value, wchar_t *buf) {
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wchar_t tmp[21];
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size_t i = 0;
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if (buf == NULL) {
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return;
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}
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if (value == 0) {
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buf[0] = '0';
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buf[1] = '\0';
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return;
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}
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// Convert digits in reverse order
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while (value > 0) {
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tmp[i++] = '0' + (value % 10);
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value /= 10;
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}
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// Reverse the string into the buffer
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for (size_t j = 0; j < i; j++) {
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buf[j] = tmp[i - j - 1];
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}
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buf[i] = '\0';
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}
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void bli_set_loader_time(wchar_t *variable, uint64_t time) {
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if (time == 0)
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return;
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wchar_t time_wstr[21];
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uint64_to_decwstr(time, time_wstr);
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gRT->SetVariable(variable,
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&bli_vendor_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(time_wstr),
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time_wstr);
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}
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void init_bli(void) {
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bli_set_loader_time(L"LoaderTimeInitUSec", usec_at_bootloader_entry);
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gRT->SetVariable(L"LoaderInfo",
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&bli_vendor_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(LIMINE_BRAND),
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LIMINE_BRAND);
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char part_uuid_str[37];
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guid_to_string(&boot_volume->part_guid, part_uuid_str);
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// Convert part_uuid_str to a wide-char string
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wchar_t part_uuid[37];
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for (size_t i = 0; i < 37; i++) {
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part_uuid[i] = (wchar_t) part_uuid_str[i];
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}
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gRT->SetVariable(L"LoaderDevicePartUUID",
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&bli_vendor_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(part_uuid),
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part_uuid);
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}
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void bli_on_boot(void) {
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bli_set_loader_time(L"LoaderTimeExecUSec", rdtsc_usec());
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}
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#endif
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