0e2bc73274
This is primarily useful for debugging, but can be useful for other purposes too. For example userspace could check whether "auto-windows" is included in the list, before triggering a boot-into-windows operation.
325 lines
8.4 KiB
C
325 lines
8.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <efi.h>
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#include <efilib.h>
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#include "util.h"
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/*
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* Allocated random UUID, intended to be shared across tools that implement
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* the (ESP)\loader\entries\<vendor>-<revision>.conf convention and the
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* associated EFI variables.
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*/
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const EFI_GUID loader_guid = { 0x4a67b082, 0x0a4c, 0x41cf, {0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f} };
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#ifdef __x86_64__
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UINT64 ticks_read(VOID) {
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UINT64 a, d;
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__asm__ volatile ("rdtsc" : "=a" (a), "=d" (d));
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return (d << 32) | a;
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}
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#elif defined(__i386__)
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UINT64 ticks_read(VOID) {
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UINT64 val;
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__asm__ volatile ("rdtsc" : "=A" (val));
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return val;
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}
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#else
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UINT64 ticks_read(VOID) {
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UINT64 val = 1;
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return val;
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}
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#endif
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/* count TSC ticks during a millisecond delay */
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UINT64 ticks_freq(VOID) {
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UINT64 ticks_start, ticks_end;
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ticks_start = ticks_read();
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uefi_call_wrapper(BS->Stall, 1, 1000);
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ticks_end = ticks_read();
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return (ticks_end - ticks_start) * 1000;
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}
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UINT64 time_usec(VOID) {
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UINT64 ticks;
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static UINT64 freq;
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ticks = ticks_read();
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if (ticks == 0)
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return 0;
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if (freq == 0) {
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freq = ticks_freq();
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if (freq == 0)
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return 0;
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}
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return 1000 * 1000 * ticks / freq;
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}
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EFI_STATUS parse_boolean(CHAR8 *v, BOOLEAN *b) {
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if (strcmpa(v, (CHAR8 *)"1") == 0 ||
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strcmpa(v, (CHAR8 *)"yes") == 0 ||
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strcmpa(v, (CHAR8 *)"y") == 0 ||
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strcmpa(v, (CHAR8 *)"true") == 0) {
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*b = TRUE;
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return EFI_SUCCESS;
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}
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if (strcmpa(v, (CHAR8 *)"0") == 0 ||
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strcmpa(v, (CHAR8 *)"no") == 0 ||
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strcmpa(v, (CHAR8 *)"n") == 0 ||
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strcmpa(v, (CHAR8 *)"false") == 0) {
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*b = FALSE;
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return EFI_SUCCESS;
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}
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return EFI_INVALID_PARAMETER;
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}
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EFI_STATUS efivar_set_raw(const EFI_GUID *vendor, CHAR16 *name, VOID *buf, UINTN size, BOOLEAN persistent) {
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UINT32 flags;
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flags = EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS;
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if (persistent)
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flags |= EFI_VARIABLE_NON_VOLATILE;
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return uefi_call_wrapper(RT->SetVariable, 5, name, (EFI_GUID *)vendor, flags, size, buf);
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}
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EFI_STATUS efivar_set(CHAR16 *name, CHAR16 *value, BOOLEAN persistent) {
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return efivar_set_raw(&loader_guid, name, value, value ? (StrLen(value)+1) * sizeof(CHAR16) : 0, persistent);
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}
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EFI_STATUS efivar_set_int(CHAR16 *name, UINTN i, BOOLEAN persistent) {
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CHAR16 str[32];
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SPrint(str, 32, L"%d", i);
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return efivar_set(name, str, persistent);
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}
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EFI_STATUS efivar_get(CHAR16 *name, CHAR16 **value) {
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_cleanup_freepool_ CHAR8 *buf = NULL;
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CHAR16 *val;
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UINTN size;
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EFI_STATUS err;
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err = efivar_get_raw(&loader_guid, name, &buf, &size);
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if (EFI_ERROR(err))
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return err;
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val = StrDuplicate((CHAR16 *)buf);
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if (!val)
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return EFI_OUT_OF_RESOURCES;
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*value = val;
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return EFI_SUCCESS;
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}
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EFI_STATUS efivar_get_int(CHAR16 *name, UINTN *i) {
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_cleanup_freepool_ CHAR16 *val = NULL;
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EFI_STATUS err;
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err = efivar_get(name, &val);
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if (!EFI_ERROR(err))
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*i = Atoi(val);
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return err;
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}
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EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, CHAR16 *name, CHAR8 **buffer, UINTN *size) {
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_cleanup_freepool_ CHAR8 *buf = NULL;
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UINTN l;
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EFI_STATUS err;
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l = sizeof(CHAR16 *) * EFI_MAXIMUM_VARIABLE_SIZE;
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buf = AllocatePool(l);
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if (!buf)
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return EFI_OUT_OF_RESOURCES;
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err = uefi_call_wrapper(RT->GetVariable, 5, name, (EFI_GUID *)vendor, NULL, &l, buf);
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if (!EFI_ERROR(err)) {
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*buffer = buf;
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buf = NULL;
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if (size)
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*size = l;
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}
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return err;
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}
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VOID efivar_set_time_usec(CHAR16 *name, UINT64 usec) {
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CHAR16 str[32];
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if (usec == 0)
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usec = time_usec();
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if (usec == 0)
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return;
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SPrint(str, 32, L"%ld", usec);
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efivar_set(name, str, FALSE);
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}
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static INTN utf8_to_16(CHAR8 *stra, CHAR16 *c) {
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CHAR16 unichar;
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UINTN len;
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UINTN i;
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if (stra[0] < 0x80)
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len = 1;
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else if ((stra[0] & 0xe0) == 0xc0)
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len = 2;
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else if ((stra[0] & 0xf0) == 0xe0)
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len = 3;
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else if ((stra[0] & 0xf8) == 0xf0)
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len = 4;
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else if ((stra[0] & 0xfc) == 0xf8)
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len = 5;
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else if ((stra[0] & 0xfe) == 0xfc)
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len = 6;
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else
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return -1;
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switch (len) {
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case 1:
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unichar = stra[0];
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break;
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case 2:
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unichar = stra[0] & 0x1f;
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break;
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case 3:
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unichar = stra[0] & 0x0f;
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break;
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case 4:
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unichar = stra[0] & 0x07;
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break;
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case 5:
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unichar = stra[0] & 0x03;
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break;
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case 6:
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unichar = stra[0] & 0x01;
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break;
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}
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for (i = 1; i < len; i++) {
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if ((stra[i] & 0xc0) != 0x80)
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return -1;
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unichar <<= 6;
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unichar |= stra[i] & 0x3f;
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}
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*c = unichar;
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return len;
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}
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CHAR16 *stra_to_str(CHAR8 *stra) {
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UINTN strlen;
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UINTN len;
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UINTN i;
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CHAR16 *str;
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len = strlena(stra);
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str = AllocatePool((len + 1) * sizeof(CHAR16));
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strlen = 0;
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i = 0;
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while (i < len) {
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INTN utf8len;
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utf8len = utf8_to_16(stra + i, str + strlen);
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if (utf8len <= 0) {
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/* invalid utf8 sequence, skip the garbage */
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i++;
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continue;
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}
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strlen++;
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i += utf8len;
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}
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str[strlen] = '\0';
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return str;
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}
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CHAR16 *stra_to_path(CHAR8 *stra) {
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CHAR16 *str;
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UINTN strlen;
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UINTN len;
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UINTN i;
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len = strlena(stra);
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str = AllocatePool((len + 2) * sizeof(CHAR16));
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str[0] = '\\';
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strlen = 1;
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i = 0;
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while (i < len) {
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INTN utf8len;
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utf8len = utf8_to_16(stra + i, str + strlen);
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if (utf8len <= 0) {
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/* invalid utf8 sequence, skip the garbage */
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i++;
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continue;
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}
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if (str[strlen] == '/')
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str[strlen] = '\\';
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if (str[strlen] == '\\' && str[strlen-1] == '\\') {
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/* skip double slashes */
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i += utf8len;
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continue;
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}
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strlen++;
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i += utf8len;
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}
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str[strlen] = '\0';
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return str;
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}
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CHAR8 *strchra(CHAR8 *s, CHAR8 c) {
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do {
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if (*s == c)
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return s;
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} while (*s++);
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return NULL;
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}
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EFI_STATUS file_read(EFI_FILE_HANDLE dir, CHAR16 *name, UINTN off, UINTN size, CHAR8 **content, UINTN *content_size) {
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EFI_FILE_HANDLE handle;
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_cleanup_freepool_ CHAR8 *buf = NULL;
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EFI_STATUS err;
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err = uefi_call_wrapper(dir->Open, 5, dir, &handle, name, EFI_FILE_MODE_READ, 0ULL);
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if (EFI_ERROR(err))
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return err;
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if (size == 0) {
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_cleanup_freepool_ EFI_FILE_INFO *info;
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info = LibFileInfo(handle);
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size = info->FileSize+1;
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}
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if (off > 0) {
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err = uefi_call_wrapper(handle->SetPosition, 2, handle, off);
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if (EFI_ERROR(err))
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return err;
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}
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buf = AllocatePool(size + 1);
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err = uefi_call_wrapper(handle->Read, 3, handle, &size, buf);
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if (!EFI_ERROR(err)) {
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buf[size] = '\0';
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*content = buf;
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buf = NULL;
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if (content_size)
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*content_size = size;
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}
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uefi_call_wrapper(handle->Close, 1, handle);
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return err;
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}
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