[PATCH 3/3] efi_loader: add ACPI table dump EFI app
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Thu May 21 20:50:25 CEST 2026
Provide an EFI binary that can dump all ACPI tables to files
<table_name>.dat. These can then be further analyzed by decompiling
with iasl.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
lib/efi_loader/Makefile | 1 +
lib/efi_loader/acpidump.c | 999 ++++++++++++++++++++++++++++++++++++++
2 files changed, 1000 insertions(+)
create mode 100644 lib/efi_loader/acpidump.c
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index d73ad43951b..118566ee7ef 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -16,6 +16,7 @@ CFLAGS_efi_boottime.o += \
apps-$(CONFIG_RISCV) += boothart
apps-$(CONFIG_BOOTEFI_HELLO_COMPILE) += helloworld
apps-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbiosdump
+apps-$(CONFIG_GENERATE_ACPI_TABLE) += acpidump
apps-$(CONFIG_EFI_LOAD_FILE2_INITRD) += initrddump
ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
apps-y += dtbdump
diff --git a/lib/efi_loader/acpidump.c b/lib/efi_loader/acpidump.c
new file mode 100644
index 00000000000..0bc3770c85d
--- /dev/null
+++ b/lib/efi_loader/acpidump.c
@@ -0,0 +1,999 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2026, Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
+ *
+ * acpidump.efi saves the ACPI table set as file.
+ *
+ * Specifying 'nocolor' as load option data suppresses colored output and
+ * clearing of the screen.
+ */
+
+#include <efi_api.h>
+#include <part.h>
+#include <string.h>
+#include <acpi/acpi_table.h>
+
+#define BUFFER_SIZE 64
+
+struct acpi_dump_table {
+ char signature[5];
+ uintptr_t addr;
+ u32 len;
+};
+
+static struct efi_simple_text_output_protocol *cout;
+static struct efi_simple_text_input_protocol *cin;
+static struct efi_boot_services *bs;
+static efi_handle_t handle;
+static struct efi_system_table *systable;
+static const efi_guid_t acpi2_guid = EFI_ACPI_TABLE_GUID;
+static const efi_guid_t acpi1_guid = EFI_GUID_EFI_ACPI1;
+static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
+static const efi_guid_t guid_simple_file_system_protocol =
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
+static const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
+static bool nocolor;
+
+/**
+ * checksum_ok() - check if byte-sum of buffer is zero
+ *
+ * @buf: buffer to check
+ * @len: buffer length
+ * Return: true if checksum is valid
+ */
+static bool checksum_ok(const void *buf, efi_uintn_t len)
+{
+ const u8 *pos = buf;
+ u8 sum = 0;
+
+ for (; len; --len, ++pos)
+ sum += *pos;
+
+ return !sum;
+}
+
+/**
+ * read_u32() - read 32-bit value via memcpy
+ *
+ * @src: source address
+ * Return: value
+ */
+static u32 read_u32(const void *src)
+{
+ u32 val;
+
+ memcpy(&val, src, sizeof(val));
+
+ return val;
+}
+
+/**
+ * read_u64() - read 64-bit value via memcpy
+ *
+ * @src: source address
+ * Return: value
+ */
+static u64 read_u64(const void *src)
+{
+ u64 val;
+
+ memcpy(&val, src, sizeof(val));
+
+ return val;
+}
+
+/**
+ * color() - set foreground color
+ *
+ * @color: foreground color
+ */
+static void color(u8 color)
+{
+ if (!nocolor)
+ cout->set_attribute(cout, color | EFI_BACKGROUND_BLACK);
+}
+
+/**
+ * print() - print string
+ *
+ * @string: text
+ */
+static void print(u16 *string)
+{
+ cout->output_string(cout, string);
+}
+
+/**
+ * is_filename_char() - check if a signature byte is filename-safe
+ *
+ * @ch: character to check
+ * Return: true if filename-safe
+ */
+static bool is_filename_char(char ch)
+{
+ return (ch >= 'A' && ch <= 'Z') ||
+ (ch >= 'a' && ch <= 'z') ||
+ (ch >= '0' && ch <= '9') || ch == '_';
+}
+
+/**
+ * ascii_to_utf16() - convert ASCII string to UTF-16
+ *
+ * @dst: destination UTF-16 buffer
+ * @dst_size: destination size in UTF-16 code units
+ * @src: source ASCII string
+ */
+static void ascii_to_utf16(u16 *dst, efi_uintn_t dst_size, const char *src)
+{
+ efi_uintn_t i;
+
+ if (!dst_size)
+ return;
+
+ for (i = 0; i < dst_size - 1 && src[i]; ++i)
+ dst[i] = (u8)src[i];
+ dst[i] = 0;
+}
+
+/**
+ * append_uint_dec() - append unsigned decimal number to C string
+ *
+ * @str: destination string
+ * @pos: current write position
+ * @size: destination size
+ * @val: value to append
+ * Return: updated write position
+ */
+static efi_uintn_t append_uint_dec(char *str, efi_uintn_t pos,
+ efi_uintn_t size, u32 val)
+{
+ char tmp[11];
+ efi_uintn_t n = 0;
+ efi_uintn_t i;
+
+ if (!val)
+ tmp[n++] = '0';
+ while (val && n < ARRAY_SIZE(tmp)) {
+ tmp[n++] = '0' + val % 10;
+ val /= 10;
+ }
+
+ for (i = 0; i < n && pos + 1 < size; ++i)
+ str[pos++] = tmp[n - i - 1];
+
+ if (pos < size)
+ str[pos] = 0;
+
+ return pos;
+}
+
+/**
+ * u32_to_utf16_dec() - convert unsigned integer to UTF-16 decimal
+ *
+ * @dst: destination UTF-16 buffer
+ * @dst_size: destination size in UTF-16 code units
+ * @val: value to convert
+ */
+static void u32_to_utf16_dec(u16 *dst, efi_uintn_t dst_size, u32 val)
+{
+ char ascii[11] = {0};
+
+ append_uint_dec(ascii, 0, sizeof(ascii), val);
+ ascii_to_utf16(dst, dst_size, ascii);
+}
+
+/**
+ * build_table_filename() - construct table filename
+ *
+ * @sig: 4-byte ACPI signature string
+ * @instance: duplicate instance number (0 for first)
+ * @name: output filename buffer
+ * @name_size: output filename buffer size
+ */
+static void build_table_filename(const char *sig, u32 instance, char *name,
+ efi_uintn_t name_size)
+{
+ efi_uintn_t pos = 0;
+ int i;
+
+ if (!name_size)
+ return;
+
+ for (i = 0; i < 4 && pos + 1 < name_size; ++i)
+ name[pos++] = is_filename_char(sig[i]) ? sig[i] : '_';
+
+ if (instance)
+ pos = append_uint_dec(name, pos, name_size, instance);
+
+ if (pos + 4 < name_size) {
+ name[pos++] = '.';
+ name[pos++] = 'd';
+ name[pos++] = 'a';
+ name[pos++] = 't';
+ }
+ name[pos] = 0;
+}
+
+/**
+ * printp() - print pointer
+ *
+ * @p: pointer
+ */
+static void printp(void *p)
+{
+ u16 str[2 + 2 * sizeof(void *) + 1] = u"0x";
+ u16 *ptr = &str[2];
+ u16 ch;
+ int i;
+
+ for (i = 8 * sizeof(void *) - 4; i >= 0; i -= 4) {
+ ch = ((uintptr_t)p >> i & 0xf) + '0';
+ if (ch > '9')
+ ch += 'a' - '9' - 1;
+ *ptr++ = ch;
+ }
+ *ptr = 0;
+ print(str);
+}
+
+/**
+ * cls() - clear screen
+ */
+static void cls(void)
+{
+ if (nocolor)
+ print(u"\r\n");
+ else
+ cout->clear_screen(cout);
+}
+
+/**
+ * error() - print error string
+ *
+ * @string: error text
+ */
+static void error(u16 *string)
+{
+ color(EFI_LIGHTRED);
+ print(string);
+ color(EFI_LIGHTBLUE);
+}
+
+/**
+ * efi_input_yn() - get answer to yes/no question
+ *
+ * Return:
+ * y or Y
+ * EFI_SUCCESS
+ * n or N
+ * EFI_ACCESS_DENIED
+ * ESC
+ * EFI_ABORTED
+ */
+static efi_status_t efi_input_yn(void)
+{
+ struct efi_input_key key = {0};
+ efi_uintn_t index;
+ efi_status_t ret;
+
+ /* Drain the console input */
+ ret = cin->reset(cin, true);
+ for (;;) {
+ ret = bs->wait_for_event(1, &cin->wait_for_key, &index);
+ if (ret != EFI_SUCCESS)
+ continue;
+ ret = cin->read_key_stroke(cin, &key);
+ if (ret != EFI_SUCCESS)
+ continue;
+ switch (key.scan_code) {
+ case 0x17: /* Escape */
+ return EFI_ABORTED;
+ default:
+ break;
+ }
+ /* Convert to lower case */
+ switch (key.unicode_char | 0x20) {
+ case 'y':
+ return EFI_SUCCESS;
+ case 'n':
+ return EFI_ACCESS_DENIED;
+ default:
+ break;
+ }
+ }
+}
+
+/**
+ * efi_input() - read string from console
+ *
+ * @buffer: input buffer
+ * @buffer_size: buffer size
+ * Return: status code
+ */
+static efi_status_t efi_input(u16 *buffer, efi_uintn_t buffer_size)
+{
+ struct efi_input_key key = {0};
+ efi_uintn_t index;
+ efi_uintn_t pos = 0;
+ u16 outbuf[2] = u" ";
+ efi_status_t ret;
+
+ /* Drain the console input */
+ ret = cin->reset(cin, true);
+ *buffer = 0;
+ for (;;) {
+ ret = bs->wait_for_event(1, &cin->wait_for_key, &index);
+ if (ret != EFI_SUCCESS)
+ continue;
+ ret = cin->read_key_stroke(cin, &key);
+ if (ret != EFI_SUCCESS)
+ continue;
+ switch (key.scan_code) {
+ case 0x17: /* Escape */
+ print(u"\r\nAborted\r\n");
+ return EFI_ABORTED;
+ default:
+ break;
+ }
+ switch (key.unicode_char) {
+ case 0x08: /* Backspace */
+ if (pos) {
+ buffer[pos--] = 0;
+ print(u"\b \b");
+ }
+ break;
+ case 0x0a: /* Linefeed */
+ case 0x0d: /* Carriage return */
+ print(u"\r\n");
+ return EFI_SUCCESS;
+ default:
+ break;
+ }
+ /* Ignore surrogate codes */
+ if (key.unicode_char >= 0xD800 && key.unicode_char <= 0xDBFF)
+ continue;
+ if (key.unicode_char >= 0x20 &&
+ pos < buffer_size - 1) {
+ *outbuf = key.unicode_char;
+ buffer[pos++] = key.unicode_char;
+ buffer[pos] = 0;
+ print(outbuf);
+ }
+ }
+}
+
+/**
+ * skip_whitespace() - skip over leading whitespace
+ *
+ * @pos: UTF-16 string
+ * Return: pointer to first non-whitespace
+ */
+static u16 *skip_whitespace(u16 *pos)
+{
+ for (; *pos && *pos <= 0x20; ++pos)
+ ;
+ return pos;
+}
+
+/**
+ * starts_with() - check if @string starts with @keyword
+ *
+ * @string: string to search for keyword
+ * @keyword: keyword to be searched
+ * Return: true fi @string starts with the keyword
+ */
+static bool starts_with(u16 *string, u16 *keyword)
+{
+ if (!string || !keyword)
+ return false;
+
+ for (; *keyword; ++string, ++keyword) {
+ if (*string != *keyword)
+ return false;
+ }
+ return true;
+}
+
+/**
+ * open_file_system() - open simple file system protocol
+ *
+ * file_system: interface of the simple file system protocol
+ * Return: status code
+ */
+static efi_status_t
+open_file_system(struct efi_simple_file_system_protocol **file_system)
+{
+ struct efi_loaded_image *loaded_image;
+ efi_status_t ret;
+ efi_handle_t *handle_buffer = NULL;
+ efi_uintn_t count;
+
+ ret = bs->open_protocol(handle, &loaded_image_guid,
+ (void **)&loaded_image, NULL, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (ret != EFI_SUCCESS) {
+ error(u"Loaded image protocol not found\r\n");
+ return ret;
+ }
+
+ /* Open the simple file system protocol on the same partition */
+ ret = bs->open_protocol(loaded_image->device_handle,
+ &guid_simple_file_system_protocol,
+ (void **)file_system, NULL, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (ret == EFI_SUCCESS)
+ return ret;
+
+ /* Open the simple file system protocol on the UEFI system partition */
+ ret = bs->locate_handle_buffer(BY_PROTOCOL, &efi_system_partition_guid,
+ NULL, &count, &handle_buffer);
+ if (ret == EFI_SUCCESS && handle_buffer)
+ ret = bs->open_protocol(handle_buffer[0],
+ &guid_simple_file_system_protocol,
+ (void **)file_system, NULL, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (ret != EFI_SUCCESS)
+ error(u"Failed to open simple file system protocol\r\n");
+ if (handle_buffer)
+ bs->free_pool(handle_buffer);
+
+ return ret;
+}
+
+/**
+ * do_help() - print help
+ */
+static void do_help(void)
+{
+ error(u"check - parse ACPI table list\r\n");
+ error(u"write - save one file per ACPI table\r\n");
+ error(u"exit - exit the shell\r\n");
+}
+
+/**
+ * get_config_table() - get configuration table
+ *
+ * @guid: GUID of the configuration table
+ * Return: pointer to configuration table or NULL
+ */
+static void *get_config_table(const efi_guid_t *guid)
+{
+ size_t i;
+
+ for (i = 0; i < systable->nr_tables; ++i) {
+ if (!memcmp(guid, &systable->tables[i].guid, sizeof(*guid)))
+ return systable->tables[i].table;
+ }
+
+ return NULL;
+}
+
+/**
+ * get_acpi_rsdp_addr() - find ACPI RSDP via EFI config table GUID
+ *
+ * Return: pointer to RSDP or NULL
+ */
+static struct acpi_rsdp *get_acpi_rsdp_addr(void)
+{
+ struct acpi_rsdp *rsdp;
+
+ rsdp = get_config_table(&acpi2_guid);
+ if (rsdp)
+ return rsdp;
+
+ rsdp = get_config_table(&acpi1_guid);
+
+ return rsdp;
+}
+
+/**
+ * add_table() - append one ACPI table entry
+ *
+ * @tables: table array
+ * @table_count: current table count
+ * @addr: table address
+ * @len: table length
+ * @sig: 4-character ACPI signature
+ * Return: status code
+ */
+static efi_status_t add_table(struct acpi_dump_table *tables, u32 *table_count,
+ uintptr_t addr, u32 len, const char *sig)
+{
+ struct acpi_dump_table *table = &tables[*table_count];
+
+ memset(table, 0, sizeof(*table));
+ memcpy(table->signature, sig, 4);
+ table->addr = addr;
+ table->len = len;
+ ++*table_count;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * has_table_addr() - check if a table address is already in the list
+ *
+ * @tables: table array
+ * @table_count: number of used entries
+ * @addr: table address to search
+ * Return: true if found
+ */
+static bool has_table_addr(struct acpi_dump_table *tables, u32 table_count,
+ uintptr_t addr)
+{
+ u32 i;
+
+ for (i = 0; i < table_count; ++i) {
+ if (tables[i].addr == addr)
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * collect_tables() - parse ACPI table structure and collect ACPI tables
+ *
+ * @tablesp: output table array
+ * @table_count: output table count
+ * Return: status code
+ */
+static efi_status_t collect_tables(struct acpi_dump_table **tablesp,
+ u32 *table_count)
+{
+ struct acpi_rsdp *rsdp;
+ struct acpi_table_header *root;
+ struct acpi_dump_table *tables;
+ uintptr_t root_addr;
+ u32 rsdp_len, root_len, max_tables;
+ u32 i, entries, entry_size;
+ bool use_xsdt;
+ efi_status_t ret;
+
+ rsdp = get_acpi_rsdp_addr();
+ print(u"RSDP address: ");
+ printp(rsdp);
+ print(u"\r\n");
+ if (!rsdp) {
+ error(u"No ACPI configuration table\r\n");
+ return EFI_NOT_FOUND;
+ }
+
+ if (memcmp(rsdp->signature, RSDP_SIG, sizeof(rsdp->signature))) {
+ error(u"Invalid RSDP signature\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (!checksum_ok(rsdp, 20)) {
+ error(u"Invalid RSDP checksum\r\n");
+ return EFI_LOAD_ERROR;
+ }
+
+ rsdp_len = rsdp->revision >= ACPI_RSDP_REV_ACPI_2_0 ?
+ read_u32(&rsdp->length) : 20;
+ if (rsdp_len < 20) {
+ error(u"Invalid RSDP length\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (rsdp->revision >= ACPI_RSDP_REV_ACPI_2_0) {
+ if (rsdp_len < sizeof(struct acpi_rsdp)) {
+ error(u"Invalid ACPI 2.0 RSDP length\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (!checksum_ok(rsdp, rsdp_len)) {
+ error(u"Invalid ACPI 2.0 RSDP checksum\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ }
+
+ if (rsdp->revision >= ACPI_RSDP_REV_ACPI_2_0 &&
+ read_u64(&rsdp->xsdt_address)) {
+ root_addr = read_u64(&rsdp->xsdt_address);
+ use_xsdt = true;
+ } else {
+ root_addr = read_u32(&rsdp->rsdt_address);
+ use_xsdt = false;
+ }
+
+ if (!root_addr) {
+ error(u"Invalid RSDT/XSDT address\r\n");
+ return EFI_LOAD_ERROR;
+ }
+
+ root = (struct acpi_table_header *)root_addr;
+ root_len = read_u32(&root->length);
+ if (root_len < sizeof(*root)) {
+ error(u"Invalid RSDT/XSDT length\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (use_xsdt && memcmp(root->signature, "XSDT", 4)) {
+ error(u"Invalid XSDT signature\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (!use_xsdt && memcmp(root->signature, "RSDT", 4)) {
+ error(u"Invalid RSDT signature\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ if (!checksum_ok(root, root_len)) {
+ error(u"Invalid RSDT/XSDT checksum\r\n");
+ return EFI_LOAD_ERROR;
+ }
+
+ entry_size = use_xsdt ? sizeof(u64) : sizeof(u32);
+ if ((root_len - sizeof(*root)) % entry_size) {
+ error(u"Invalid RSDT/XSDT entry list\r\n");
+ return EFI_LOAD_ERROR;
+ }
+ entries = (root_len - sizeof(*root)) / entry_size;
+ /* RSDP + root + each root entry + up to DSDT/FACS per entry */
+ max_tables = 2 + 3 * entries;
+
+ ret = bs->allocate_pool(EFI_LOADER_DATA,
+ max_tables * sizeof(struct acpi_dump_table),
+ (void **)&tables);
+ if (ret != EFI_SUCCESS) {
+ error(u"Out of memory\r\n");
+ return ret;
+ }
+ *table_count = 0;
+
+ ret = add_table(tables, table_count, (uintptr_t)rsdp, rsdp_len, "RSDP");
+ if (ret != EFI_SUCCESS)
+ goto err_out;
+
+ ret = add_table(tables, table_count, root_addr, root_len, root->signature);
+ if (ret != EFI_SUCCESS)
+ goto err_out;
+
+ for (i = 0; i < entries; ++i) {
+ uintptr_t addr;
+ struct acpi_table_header *table;
+ u32 len;
+
+ if (use_xsdt) {
+ u64 *entry = (u64 *)((u8 *)root + sizeof(*root));
+
+ addr = read_u64(&entry[i]);
+ } else {
+ u32 *entry = (u32 *)((u8 *)root + sizeof(*root));
+
+ addr = read_u32(&entry[i]);
+ }
+ if (!addr)
+ continue;
+ if (has_table_addr(tables, *table_count, addr))
+ continue;
+
+ table = (struct acpi_table_header *)addr;
+ len = read_u32(&table->length);
+ if (len < sizeof(*table)) {
+ error(u"Invalid ACPI table length\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+ if (!checksum_ok(table, len)) {
+ error(u"Invalid ACPI table checksum\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+
+ ret = add_table(tables, table_count, addr, len, table->signature);
+ if (ret != EFI_SUCCESS)
+ goto err_out;
+
+ /*
+ * FADT (signature FACP) references DSDT and FACS outside RSDT/XSDT.
+ * Include them so output matches acpidump -b style completeness.
+ */
+ if (!memcmp(table->signature, "FACP", 4)) {
+ struct acpi_fadt *fadt = (struct acpi_fadt *)table;
+ uintptr_t dsdt_addr;
+ uintptr_t facs_addr;
+
+ dsdt_addr = read_u64(&fadt->x_dsdt);
+ if (!dsdt_addr)
+ dsdt_addr = read_u32(&fadt->dsdt);
+ if (dsdt_addr && !has_table_addr(tables, *table_count,
+ dsdt_addr)) {
+ struct acpi_table_header *dsdt;
+ u32 dsdt_len;
+
+ dsdt = (struct acpi_table_header *)dsdt_addr;
+ dsdt_len = read_u32(&dsdt->length);
+ if (dsdt_len < sizeof(*dsdt)) {
+ error(u"Invalid DSDT length\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+ if (!checksum_ok(dsdt, dsdt_len)) {
+ error(u"Invalid DSDT checksum\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+
+ ret = add_table(tables, table_count, dsdt_addr, dsdt_len,
+ dsdt->signature);
+ if (ret != EFI_SUCCESS)
+ goto err_out;
+ }
+
+ facs_addr = read_u64(&fadt->x_firmware_ctrl);
+ if (!facs_addr)
+ facs_addr = read_u32(&fadt->firmware_ctrl);
+ if (facs_addr && !has_table_addr(tables, *table_count,
+ facs_addr)) {
+ struct acpi_facs *facs;
+ u32 facs_len;
+
+ facs = (struct acpi_facs *)facs_addr;
+ if (memcmp(facs->signature, "FACS", 4)) {
+ error(u"Invalid FACS signature\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+ facs_len = read_u32(&facs->length);
+ if (facs_len < sizeof(*facs)) {
+ error(u"Invalid FACS length\r\n");
+ ret = EFI_LOAD_ERROR;
+ goto err_out;
+ }
+ ret = add_table(tables, table_count, facs_addr, facs_len,
+ facs->signature);
+ if (ret != EFI_SUCCESS)
+ goto err_out;
+ }
+ }
+ }
+
+ *tablesp = tables;
+
+ return EFI_SUCCESS;
+
+err_out:
+ bs->free_pool(tables);
+ return ret;
+}
+
+/**
+ * save_file() - save file to EFI system partition
+ *
+ * @filename: file name
+ * @buf: buffer to write
+ * @size: size of the buffer
+ */
+static efi_status_t save_file(u16 *filename, void *buf, efi_uintn_t size)
+{
+ efi_uintn_t ret;
+ struct efi_simple_file_system_protocol *file_system;
+ struct efi_file_handle *root, *file;
+
+ ret = open_file_system(&file_system);
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ /* Open volume */
+ ret = file_system->open_volume(file_system, &root);
+ if (ret != EFI_SUCCESS) {
+ error(u"Failed to open volume\r\n");
+ return ret;
+ }
+ /* Check if file already exists */
+ ret = root->open(root, &file, filename, EFI_FILE_MODE_READ, 0);
+ if (ret == EFI_SUCCESS) {
+ file->close(file);
+ print(u"Overwrite existing file (y/n)? ");
+ ret = efi_input_yn();
+ print(u"\r\n");
+ if (ret != EFI_SUCCESS) {
+ root->close(root);
+ error(u"Aborted by user\r\n");
+ return ret;
+ }
+ }
+
+ /* Create file */
+ ret = root->open(root, &file, filename,
+ EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
+ EFI_FILE_MODE_CREATE, EFI_FILE_ARCHIVE);
+ if (ret == EFI_SUCCESS) {
+ /* Write file */
+ ret = file->write(file, &size, buf);
+ if (ret != EFI_SUCCESS)
+ error(u"Failed to write file\r\n");
+ file->close(file);
+ } else {
+ error(u"Failed to open file\r\n");
+ }
+ root->close(root);
+
+ return ret;
+}
+
+/**
+ * do_check() - parse ACPI tables and report success/failure
+ *
+ * Return: status code
+ */
+static efi_status_t do_check(void)
+{
+ struct acpi_dump_table *tables;
+ u32 table_count;
+ u16 num[11] = {0};
+ efi_status_t ret;
+
+ ret = collect_tables(&tables, &table_count);
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ if (!table_count) {
+ print(u"No ACPI tables found\r\n");
+ return EFI_NOT_FOUND;
+ }
+
+ u32_to_utf16_dec(num, ARRAY_SIZE(num), table_count);
+
+ print(u"ACPI tables found: ");
+ print(num);
+ print(u"\r\n");
+
+ bs->free_pool(tables);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * do_write() - ask filename and save ACPI table set
+ *
+ * Return: status code
+ */
+static efi_status_t do_write(void)
+{
+ struct acpi_dump_table *tables;
+ u16 filename[BUFFER_SIZE];
+ char ascii_name[BUFFER_SIZE];
+ u32 table_count;
+ u32 i;
+ efi_status_t ret;
+
+ ret = collect_tables(&tables, &table_count);
+ if (ret != EFI_SUCCESS)
+ return ret;
+ if (!table_count) {
+ print(u"No ACPI tables found\r\n");
+ bs->free_pool(tables);
+ return EFI_NOT_FOUND;
+ }
+
+ for (i = 0; i < table_count; ++i) {
+ u8 *buf;
+ u32 instance = 0;
+ u32 same_type = 0;
+ u32 j;
+
+ for (j = 0; j < table_count; ++j) {
+ if (!memcmp(tables[i].signature, tables[j].signature, 4))
+ ++same_type;
+ }
+
+ if (same_type > 1) {
+ /* Number duplicates starting at 1 for the first instance. */
+ for (j = 0; j <= i; ++j) {
+ if (!memcmp(tables[i].signature, tables[j].signature, 4))
+ ++instance;
+ }
+ }
+
+ build_table_filename(tables[i].signature, instance, ascii_name,
+ ARRAY_SIZE(ascii_name));
+ ascii_to_utf16(filename, ARRAY_SIZE(filename), ascii_name);
+
+ ret = bs->allocate_pool(EFI_LOADER_DATA, tables[i].len,
+ (void **)&buf);
+ if (ret != EFI_SUCCESS) {
+ error(u"Out of memory\r\n");
+ break;
+ }
+
+ memcpy(buf, (void *)tables[i].addr, tables[i].len);
+ ret = save_file(filename, buf, tables[i].len);
+ if (ret == EFI_SUCCESS) {
+ print(filename);
+ print(u" written\r\n");
+ }
+
+ bs->free_pool(buf);
+ if (ret != EFI_SUCCESS)
+ break;
+ }
+
+ bs->free_pool(tables);
+
+ return ret;
+}
+
+/**
+ * get_load_options() - get load options
+ *
+ * Return: load options or NULL
+ */
+static u16 *get_load_options(void)
+{
+ efi_status_t ret;
+ struct efi_loaded_image *loaded_image;
+
+ ret = bs->open_protocol(handle, &loaded_image_guid,
+ (void **)&loaded_image, NULL, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (ret != EFI_SUCCESS) {
+ error(u"Loaded image protocol not found\r\n");
+ return NULL;
+ }
+
+ if (!loaded_image->load_options_size || !loaded_image->load_options)
+ return NULL;
+
+ return loaded_image->load_options;
+}
+
+/**
+ * command_loop() - process user commands
+ */
+static void command_loop(void)
+{
+ for (;;) {
+ u16 command[BUFFER_SIZE];
+ u16 *pos;
+ efi_status_t ret;
+
+ print(u"=> ");
+ ret = efi_input(command, ARRAY_SIZE(command));
+ if (ret == EFI_ABORTED)
+ break;
+ pos = skip_whitespace(command);
+ if (starts_with(pos, u"exit")) {
+ break;
+ } else if (starts_with(pos, u"check")) {
+ ret = do_check();
+ if (ret == EFI_SUCCESS)
+ print(u"OK\r\n");
+ } else if (starts_with(pos, u"write")) {
+ do_write();
+ } else {
+ do_help();
+ }
+ }
+}
+
+/**
+ * efi_main() - entry point of the EFI application.
+ *
+ * @handle: handle of the loaded image
+ * @systab: system table
+ * Return: status code
+ */
+efi_status_t EFIAPI efi_main(efi_handle_t image_handle,
+ struct efi_system_table *systab)
+{
+ u16 *load_options;
+
+ handle = image_handle;
+ systable = systab;
+ cout = systable->con_out;
+ cin = systable->con_in;
+ bs = systable->boottime;
+ load_options = get_load_options();
+
+ if (starts_with(load_options, u"nocolor"))
+ nocolor = true;
+
+ color(EFI_WHITE);
+ cls();
+ print(u"ACPI Dump\r\n=========\r\n\r\n");
+ color(EFI_LIGHTBLUE);
+
+ command_loop();
+
+ color(EFI_LIGHTGRAY);
+ cls();
+
+ return EFI_SUCCESS;
+}
--
2.53.0
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