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efi_loader: implement EFI_DT_FIXUP_PROTOCOL

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A boot manager like GRUB can use the protocol to

* apply U-Boot's fix-ups to the a device-tree
* let U-Boot make memory reservations according to the device-tree
* install the device-tree as a configuration table

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-12-13 10:30:24 +01:00
parent 48618e9b8b
commit 94686f60a2
7 changed files with 215 additions and 80 deletions
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80
cmd/bootefi.c
View file

@ -211,86 +211,6 @@ done:
return ret;
}
/**
* efi_reserve_memory() - add reserved memory to memory map
*
* @addr: start address of the reserved memory range
* @size: size of the reserved memory range
* @nomap: indicates that the memory range shall not be accessed by the
* UEFI payload
*/
static void efi_reserve_memory(u64 addr, u64 size, bool nomap)
{
int type;
efi_uintn_t ret;
/* Convert from sandbox address space. */
addr = (uintptr_t)map_sysmem(addr, 0);
if (nomap)
type = EFI_RESERVED_MEMORY_TYPE;
else
type = EFI_BOOT_SERVICES_DATA;
ret = efi_add_memory_map(addr, size, type);
if (ret != EFI_SUCCESS)
log_err("Reserved memory mapping failed addr %llx size %llx\n",
addr, size);
}
/**
* efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
*
* The mem_rsv entries of the FDT are added to the memory map. Any failures are
* ignored because this is not critical and we would rather continue to try to
* boot.
*
* @fdt: Pointer to device tree
*/
static void efi_carve_out_dt_rsv(void *fdt)
{
int nr_rsv, i;
u64 addr, size;
int nodeoffset, subnode;
nr_rsv = fdt_num_mem_rsv(fdt);
/* Look for an existing entry and add it to the efi mem map. */
for (i = 0; i < nr_rsv; i++) {
if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
continue;
efi_reserve_memory(addr, size, false);
}
/* process reserved-memory */
nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
if (nodeoffset >= 0) {
subnode = fdt_first_subnode(fdt, nodeoffset);
while (subnode >= 0) {
fdt_addr_t fdt_addr;
fdt_size_t fdt_size;
/* check if this subnode has a reg property */
fdt_addr = fdtdec_get_addr_size_auto_parent(
fdt, nodeoffset, subnode,
"reg", 0, &fdt_size, false);
/*
* The /reserved-memory node may have children with
* a size instead of a reg property.
*/
if (fdt_addr != FDT_ADDR_T_NONE &&
fdtdec_get_is_enabled(fdt, subnode)) {
bool nomap;
nomap = !!fdt_getprop(fdt, subnode, "no-map",
NULL);
efi_reserve_memory(fdt_addr, fdt_size, nomap);
}
subnode = fdt_next_subnode(fdt, subnode);
}
}
}
/**
* get_config_table() - get configuration table
*

5
cmd/efidebug.c
View file

@ -8,6 +8,7 @@
#include <charset.h>
#include <common.h>
#include <command.h>
#include <efi_dt_fixup.h>
#include <efi_loader.h>
#include <efi_rng.h>
#include <exports.h>
@ -495,6 +496,10 @@ static const struct {
"PXE Base Code",
EFI_PXE_BASE_CODE_PROTOCOL_GUID,
},
{
"Device-Tree Fixup",
EFI_DT_FIXUP_PROTOCOL_GUID,
},
/* Configuration table GUIDs */
{
"ACPI table",

39
include/efi_dt_fixup.h Normal file
View file

@ -0,0 +1,39 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* EFI_DT_FIXUP_PROTOCOL
*
* Copyright (c) 2020 Heinrich Schuchardt
*/
#include <efi_api.h>
#define EFI_DT_FIXUP_PROTOCOL_GUID \
EFI_GUID(0xe617d64c, 0xfe08, 0x46da, 0xf4, 0xdc, \
0xbb, 0xd5, 0x87, 0x0c, 0x73, 0x00)
#define EFI_DT_FIXUP_PROTOCOL_REVISION 0x00010000
/* Add nodes and update properties */
#define EFI_DT_APPLY_FIXUPS 0x00000001
/*
* Reserve memory according to the /reserved-memory node
* and the memory reservation block
*/
#define EFI_DT_RESERVE_MEMORY 0x00000002
/* Install the device-tree as configuration table */
#define EFI_DT_INSTALL_TABLE 0x00000004
#define EFI_DT_ALL (EFI_DT_APPLY_FIXUPS | \
EFI_DT_RESERVE_MEMORY | \
EFI_DT_INSTALL_TABLE)
struct efi_dt_fixup_protocol {
u64 revision;
efi_status_t (EFIAPI *fixup) (struct efi_dt_fixup_protocol *this,
void *dtb,
efi_uintn_t *buffer_size,
u32 flags);
};
extern struct efi_dt_fixup_protocol efi_dt_fixup_prot;
extern const efi_guid_t efi_guid_dt_fixup_protocol;

2
include/efi_loader.h
View file

@ -411,6 +411,8 @@ void efi_runtime_detach(void);
/* efi_convert_pointer() - convert pointer to virtual address */
efi_status_t EFIAPI efi_convert_pointer(efi_uintn_t debug_disposition,
void **address);
/* Carve out DT reserved memory ranges */
void efi_carve_out_dt_rsv(void *fdt);
/* Called by bootefi to make console interface available */
efi_status_t efi_console_register(void);
/* Called by bootefi to make all disk storage accessible as EFI objects */

3
lib/efi_loader/Makefile
View file

@ -29,6 +29,9 @@ obj-y += efi_console.o
obj-y += efi_device_path.o
obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
obj-y += efi_device_path_utilities.o
ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
obj-y += efi_dt_fixup.o
endif
obj-y += efi_file.o
obj-$(CONFIG_EFI_LOADER_HII) += efi_hii.o
obj-y += efi_image_loader.o

160
lib/efi_loader/efi_dt_fixup.c Normal file
View file

@ -0,0 +1,160 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* EFI_DT_FIXUP_PROTOCOL
*
* Copyright (c) 2020 Heinrich Schuchardt
*/
#include <common.h>
#include <efi_dt_fixup.h>
#include <efi_loader.h>
#include <mapmem.h>
static efi_status_t EFIAPI efi_dt_fixup(struct efi_dt_fixup_protocol *this,
void *dtb,
efi_uintn_t *buffer_size,
u32 flags);
struct efi_dt_fixup_protocol efi_dt_fixup_prot = {
.revision = EFI_DT_FIXUP_PROTOCOL_REVISION,
.fixup = efi_dt_fixup
};
const efi_guid_t efi_guid_dt_fixup_protocol = EFI_DT_FIXUP_PROTOCOL_GUID;
/**
* efi_reserve_memory() - add reserved memory to memory map
*
* @addr: start address of the reserved memory range
* @size: size of the reserved memory range
* @nomap: indicates that the memory range shall not be accessed by the
* UEFI payload
*/
static void efi_reserve_memory(u64 addr, u64 size, bool nomap)
{
int type;
efi_uintn_t ret;
/* Convert from sandbox address space. */
addr = (uintptr_t)map_sysmem(addr, 0);
if (nomap)
type = EFI_RESERVED_MEMORY_TYPE;
else
type = EFI_BOOT_SERVICES_DATA;
ret = efi_add_memory_map(addr, size, type);
if (ret != EFI_SUCCESS)
log_err("Reserved memory mapping failed addr %llx size %llx\n",
addr, size);
}
/**
* efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
*
* The mem_rsv entries of the FDT are added to the memory map. Any failures are
* ignored because this is not critical and we would rather continue to try to
* boot.
*
* @fdt: Pointer to device tree
*/
void efi_carve_out_dt_rsv(void *fdt)
{
int nr_rsv, i;
u64 addr, size;
int nodeoffset, subnode;
nr_rsv = fdt_num_mem_rsv(fdt);
/* Look for an existing entry and add it to the efi mem map. */
for (i = 0; i < nr_rsv; i++) {
if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
continue;
efi_reserve_memory(addr, size, false);
}
/* process reserved-memory */
nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
if (nodeoffset >= 0) {
subnode = fdt_first_subnode(fdt, nodeoffset);
while (subnode >= 0) {
fdt_addr_t fdt_addr;
fdt_size_t fdt_size;
/* check if this subnode has a reg property */
fdt_addr = fdtdec_get_addr_size_auto_parent(
fdt, nodeoffset, subnode,
"reg", 0, &fdt_size, false);
/*
* The /reserved-memory node may have children with
* a size instead of a reg property.
*/
if (fdt_addr != FDT_ADDR_T_NONE &&
fdtdec_get_is_enabled(fdt, subnode)) {
bool nomap;
nomap = !!fdt_getprop(fdt, subnode, "no-map",
NULL);
efi_reserve_memory(fdt_addr, fdt_size, nomap);
}
subnode = fdt_next_subnode(fdt, subnode);
}
}
}
static efi_status_t EFIAPI efi_dt_fixup(struct efi_dt_fixup_protocol *this,
void *dtb,
efi_uintn_t *buffer_size,
u32 flags)
{
efi_status_t ret;
size_t required_size;
bootm_headers_t img = { 0 };
EFI_ENTRY("%p, %p, %p, %d", this, dtb, buffer_size, flags);
if (this != &efi_dt_fixup_prot || !dtb || !buffer_size ||
!flags || (flags & ~EFI_DT_ALL)) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (fdt_check_header(dtb)) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (flags & EFI_DT_APPLY_FIXUPS) {
required_size = fdt_off_dt_strings(dtb) +
fdt_size_dt_strings(dtb) +
0x3000;
} else {
required_size = fdt_totalsize(dtb);
}
if (required_size > *buffer_size) {
*buffer_size = required_size;
ret = EFI_BUFFER_TOO_SMALL;
goto out;
}
fdt_set_totalsize(dtb, *buffer_size);
if (flags & EFI_DT_APPLY_FIXUPS) {
if (image_setup_libfdt(&img, dtb, 0, NULL)) {
log_err("failed to process device tree\n");
ret = EFI_INVALID_PARAMETER;
goto out;
}
}
if (flags & EFI_DT_RESERVE_MEMORY)
efi_carve_out_dt_rsv(dtb);
if (EFI_DT_INSTALL_TABLE) {
ret = efi_install_configuration_table(&efi_guid_fdt, dtb);
if (ret != EFI_SUCCESS) {
log_err("ERROR: failed to install device tree\n");
goto out;
}
}
ret = EFI_SUCCESS;
out:
return EFI_EXIT(ret);
}

6
lib/efi_loader/efi_root_node.c
View file

@ -7,6 +7,7 @@
#include <common.h>
#include <malloc.h>
#include <efi_dt_fixup.h>
#include <efi_loader.h>
const efi_guid_t efi_u_boot_guid = U_BOOT_GUID;
@ -60,6 +61,11 @@ efi_status_t efi_root_node_register(void)
/* Device path utilities protocol */
&efi_guid_device_path_utilities_protocol,
(void *)&efi_device_path_utilities,
#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
/* Device-tree fix-up protocol */
&efi_guid_dt_fixup_protocol,
(void *)&efi_dt_fixup_prot,
#endif
#if CONFIG_IS_ENABLED(EFI_UNICODE_COLLATION_PROTOCOL2)
#if CONFIG_IS_ENABLED(EFI_UNICODE_COLLATION_PROTOCOL)
/* Deprecated Unicode collation protocol */