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![Heinrich Schuchardt](/assets/img/avatar_default.png)
The first parameter of efi_add_runtime_mmio() is a pointer to a pointer. This should be reflected in the documentation. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>
714 lines
19 KiB
C
714 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI application runtime services
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <elf.h>
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#include <efi_loader.h>
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#include <rtc.h>
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/* For manual relocation support */
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DECLARE_GLOBAL_DATA_PTR;
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struct efi_runtime_mmio_list {
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struct list_head link;
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void **ptr;
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u64 paddr;
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u64 len;
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};
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/* This list contains all runtime available mmio regions */
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LIST_HEAD(efi_runtime_mmio);
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static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void);
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static efi_status_t __efi_runtime EFIAPI efi_device_error(void);
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static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void);
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/*
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* TODO(sjg@chromium.org): These defines and structures should come from the ELF
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* header for each architecture (or a generic header) rather than being repeated
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* here.
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*/
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#if defined(__aarch64__)
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#define R_RELATIVE R_AARCH64_RELATIVE
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#define R_MASK 0xffffffffULL
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#define IS_RELA 1
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#elif defined(__arm__)
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#define R_RELATIVE R_ARM_RELATIVE
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#define R_MASK 0xffULL
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#elif defined(__i386__)
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#define R_RELATIVE R_386_RELATIVE
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#define R_MASK 0xffULL
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#elif defined(__x86_64__)
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#define R_RELATIVE R_X86_64_RELATIVE
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#define R_MASK 0xffffffffULL
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#define IS_RELA 1
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#elif defined(__riscv)
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#define R_RELATIVE R_RISCV_RELATIVE
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#define R_MASK 0xffULL
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#define IS_RELA 1
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struct dyn_sym {
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ulong foo1;
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ulong addr;
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u32 foo2;
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u32 foo3;
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};
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#if (__riscv_xlen == 32)
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#define R_ABSOLUTE R_RISCV_32
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#define SYM_INDEX 8
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#elif (__riscv_xlen == 64)
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#define R_ABSOLUTE R_RISCV_64
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#define SYM_INDEX 32
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#else
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#error unknown riscv target
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#endif
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#else
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#error Need to add relocation awareness
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#endif
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struct elf_rel {
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ulong *offset;
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ulong info;
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};
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struct elf_rela {
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ulong *offset;
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ulong info;
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long addend;
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};
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/*
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* EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
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* payload are running concurrently at the same time. In this mode, we can
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* handle a good number of runtime callbacks
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*/
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/**
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* efi_update_table_header_crc32() - Update crc32 in table header
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*
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* @table: EFI table
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*/
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void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table)
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{
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table->crc32 = 0;
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table->crc32 = crc32(0, (const unsigned char *)table,
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table->headersize);
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}
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/**
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* efi_reset_system_boottime() - reset system at boot time
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*
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* This function implements the ResetSystem() runtime service before
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* SetVirtualAddressMap() is called.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @reset_type: type of reset to perform
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* @reset_status: status code for the reset
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* @data_size: size of reset_data
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* @reset_data: information about the reset
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*/
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static void EFIAPI efi_reset_system_boottime(
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enum efi_reset_type reset_type,
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efi_status_t reset_status,
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unsigned long data_size, void *reset_data)
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{
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struct efi_event *evt;
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EFI_ENTRY("%d %lx %lx %p", reset_type, reset_status, data_size,
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reset_data);
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/* Notify reset */
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list_for_each_entry(evt, &efi_events, link) {
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if (evt->group &&
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!guidcmp(evt->group,
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&efi_guid_event_group_reset_system)) {
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efi_signal_event(evt, false);
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break;
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}
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}
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switch (reset_type) {
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case EFI_RESET_COLD:
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case EFI_RESET_WARM:
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case EFI_RESET_PLATFORM_SPECIFIC:
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do_reset(NULL, 0, 0, NULL);
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break;
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case EFI_RESET_SHUTDOWN:
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#ifdef CONFIG_CMD_POWEROFF
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do_poweroff(NULL, 0, 0, NULL);
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#endif
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break;
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}
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while (1) { }
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}
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/**
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* efi_get_time_boottime() - get current time at boot time
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*
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* This function implements the GetTime runtime service before
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* SetVirtualAddressMap() is called.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification
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* for details.
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*
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* @time: pointer to structure to receive current time
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* @capabilities: pointer to structure to receive RTC properties
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* Returns: status code
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*/
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static efi_status_t EFIAPI efi_get_time_boottime(
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struct efi_time *time,
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struct efi_time_cap *capabilities)
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{
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#ifdef CONFIG_DM_RTC
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efi_status_t ret = EFI_SUCCESS;
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int r;
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struct rtc_time tm;
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struct udevice *dev;
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EFI_ENTRY("%p %p", time, capabilities);
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if (!time) {
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ret = EFI_INVALID_PARAMETER;
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goto out;
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}
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r = uclass_get_device(UCLASS_RTC, 0, &dev);
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if (!r)
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r = dm_rtc_get(dev, &tm);
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if (r) {
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ret = EFI_DEVICE_ERROR;
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goto out;
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}
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memset(time, 0, sizeof(*time));
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time->year = tm.tm_year;
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time->month = tm.tm_mon;
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time->day = tm.tm_mday;
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time->hour = tm.tm_hour;
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time->minute = tm.tm_min;
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time->second = tm.tm_sec;
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time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
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if (tm.tm_isdst > 0)
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time->daylight |= EFI_TIME_IN_DAYLIGHT;
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time->timezone = EFI_UNSPECIFIED_TIMEZONE;
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if (capabilities) {
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/* Set reasonable dummy values */
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capabilities->resolution = 1; /* 1 Hz */
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capabilities->accuracy = 100000000; /* 100 ppm */
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capabilities->sets_to_zero = false;
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}
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out:
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return EFI_EXIT(ret);
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#else
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EFI_ENTRY("%p %p", time, capabilities);
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return EFI_EXIT(EFI_DEVICE_ERROR);
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#endif
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}
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/**
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* efi_reset_system() - reset system
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*
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* This function implements the ResetSystem() runtime service after
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* SetVirtualAddressMap() is called. It only executes an endless loop.
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* Boards may override the helpers below to implement reset functionality.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @reset_type: type of reset to perform
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* @reset_status: status code for the reset
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* @data_size: size of reset_data
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* @reset_data: information about the reset
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*/
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void __weak __efi_runtime EFIAPI efi_reset_system(
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enum efi_reset_type reset_type,
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efi_status_t reset_status,
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unsigned long data_size, void *reset_data)
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{
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/* Nothing we can do */
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while (1) { }
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}
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/**
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* efi_reset_system_init() - initialize the reset driver
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*
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* Boards may override this function to initialize the reset driver.
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*/
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efi_status_t __weak efi_reset_system_init(void)
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{
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return EFI_SUCCESS;
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}
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/**
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* efi_get_time() - get current time
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*
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* This function implements the GetTime runtime service after
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* SetVirtualAddressMap() is called. As the U-Boot driver are not available
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* anymore only an error code is returned.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification
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* for details.
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*
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* @time: pointer to structure to receive current time
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* @capabilities: pointer to structure to receive RTC properties
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* Returns: status code
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*/
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efi_status_t __weak __efi_runtime EFIAPI efi_get_time(
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struct efi_time *time,
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struct efi_time_cap *capabilities)
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{
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/* Nothing we can do */
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return EFI_DEVICE_ERROR;
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}
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struct efi_runtime_detach_list_struct {
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void *ptr;
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void *patchto;
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};
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static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
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{
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/* do_reset is gone */
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.ptr = &efi_runtime_services.reset_system,
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.patchto = efi_reset_system,
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}, {
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/* invalidate_*cache_all are gone */
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.ptr = &efi_runtime_services.set_virtual_address_map,
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.patchto = &efi_unimplemented,
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}, {
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/* RTC accessors are gone */
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.ptr = &efi_runtime_services.get_time,
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.patchto = &efi_get_time,
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}, {
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/* Clean up system table */
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.ptr = &systab.con_in,
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.patchto = NULL,
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}, {
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/* Clean up system table */
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.ptr = &systab.con_out,
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.patchto = NULL,
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}, {
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/* Clean up system table */
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.ptr = &systab.std_err,
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.patchto = NULL,
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}, {
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/* Clean up system table */
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.ptr = &systab.boottime,
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.patchto = NULL,
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}, {
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.ptr = &efi_runtime_services.get_variable,
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.patchto = &efi_device_error,
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}, {
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.ptr = &efi_runtime_services.get_next_variable_name,
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.patchto = &efi_device_error,
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}, {
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.ptr = &efi_runtime_services.set_variable,
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.patchto = &efi_device_error,
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}
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};
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static bool efi_runtime_tobedetached(void *p)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++)
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if (efi_runtime_detach_list[i].ptr == p)
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return true;
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return false;
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}
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static void efi_runtime_detach(ulong offset)
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{
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int i;
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ulong patchoff = offset - (ulong)gd->relocaddr;
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for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++) {
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ulong patchto = (ulong)efi_runtime_detach_list[i].patchto;
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ulong *p = efi_runtime_detach_list[i].ptr;
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ulong newaddr = patchto ? (patchto + patchoff) : 0;
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debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
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*p = newaddr;
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}
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/* Update CRC32 */
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efi_update_table_header_crc32(&efi_runtime_services.hdr);
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}
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/* Relocate EFI runtime to uboot_reloc_base = offset */
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void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map)
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{
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#ifdef IS_RELA
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struct elf_rela *rel = (void*)&__efi_runtime_rel_start;
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#else
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struct elf_rel *rel = (void*)&__efi_runtime_rel_start;
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static ulong lastoff = CONFIG_SYS_TEXT_BASE;
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#endif
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debug("%s: Relocating to offset=%lx\n", __func__, offset);
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for (; (ulong)rel < (ulong)&__efi_runtime_rel_stop; rel++) {
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ulong base = CONFIG_SYS_TEXT_BASE;
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ulong *p;
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ulong newaddr;
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p = (void*)((ulong)rel->offset - base) + gd->relocaddr;
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debug("%s: rel->info=%#lx *p=%#lx rel->offset=%p\n", __func__,
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rel->info, *p, rel->offset);
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switch (rel->info & R_MASK) {
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case R_RELATIVE:
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#ifdef IS_RELA
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newaddr = rel->addend + offset - CONFIG_SYS_TEXT_BASE;
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#else
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newaddr = *p - lastoff + offset;
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#endif
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break;
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#ifdef R_ABSOLUTE
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case R_ABSOLUTE: {
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ulong symidx = rel->info >> SYM_INDEX;
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extern struct dyn_sym __dyn_sym_start[];
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newaddr = __dyn_sym_start[symidx].addr + offset;
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#ifdef IS_RELA
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newaddr -= CONFIG_SYS_TEXT_BASE;
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#endif
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break;
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}
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#endif
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default:
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if (!efi_runtime_tobedetached(p))
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printf("%s: Unknown relocation type %llx\n",
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__func__, rel->info & R_MASK);
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continue;
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}
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/* Check if the relocation is inside bounds */
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if (map && ((newaddr < map->virtual_start) ||
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newaddr > (map->virtual_start +
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(map->num_pages << EFI_PAGE_SHIFT)))) {
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if (!efi_runtime_tobedetached(p))
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printf("%s: Relocation at %p is out of "
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"range (%lx)\n", __func__, p, newaddr);
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continue;
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}
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debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
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*p = newaddr;
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flush_dcache_range((ulong)p & ~(EFI_CACHELINE_SIZE - 1),
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ALIGN((ulong)&p[1], EFI_CACHELINE_SIZE));
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}
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#ifndef IS_RELA
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lastoff = offset;
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#endif
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invalidate_icache_all();
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}
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/**
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* efi_set_virtual_address_map() - change from physical to virtual mapping
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*
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* This function implements the SetVirtualAddressMap() runtime service.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @memory_map_size: size of the virtual map
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* @descriptor_size: size of an entry in the map
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* @descriptor_version: version of the map entries
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* @virtmap: virtual address mapping information
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* Return: status code
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*/
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static efi_status_t EFIAPI efi_set_virtual_address_map(
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unsigned long memory_map_size,
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unsigned long descriptor_size,
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uint32_t descriptor_version,
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struct efi_mem_desc *virtmap)
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{
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int n = memory_map_size / descriptor_size;
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int i;
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int rt_code_sections = 0;
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EFI_ENTRY("%lx %lx %x %p", memory_map_size, descriptor_size,
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descriptor_version, virtmap);
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/*
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* TODO:
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* Further down we are cheating. While really we should implement
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* SetVirtualAddressMap() events and ConvertPointer() to allow
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* dynamically loaded drivers to expose runtime services, we don't
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* today.
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*
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* So let's ensure we see exactly one single runtime section, as
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* that is the built-in one. If we see more (or less), someone must
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* have tried adding or removing to that which we don't support yet.
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* In that case, let's better fail rather than expose broken runtime
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* services.
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*/
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for (i = 0; i < n; i++) {
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struct efi_mem_desc *map = (void*)virtmap +
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(descriptor_size * i);
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if (map->type == EFI_RUNTIME_SERVICES_CODE)
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rt_code_sections++;
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}
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if (rt_code_sections != 1) {
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/*
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* We expose exactly one single runtime code section, so
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* something is definitely going wrong.
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*/
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return EFI_EXIT(EFI_INVALID_PARAMETER);
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}
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/* Rebind mmio pointers */
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for (i = 0; i < n; i++) {
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struct efi_mem_desc *map = (void*)virtmap +
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(descriptor_size * i);
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struct list_head *lhandle;
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efi_physical_addr_t map_start = map->physical_start;
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efi_physical_addr_t map_len = map->num_pages << EFI_PAGE_SHIFT;
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efi_physical_addr_t map_end = map_start + map_len;
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u64 off = map->virtual_start - map_start;
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/* Adjust all mmio pointers in this region */
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list_for_each(lhandle, &efi_runtime_mmio) {
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struct efi_runtime_mmio_list *lmmio;
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lmmio = list_entry(lhandle,
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struct efi_runtime_mmio_list,
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link);
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if ((map_start <= lmmio->paddr) &&
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(map_end >= lmmio->paddr)) {
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uintptr_t new_addr = lmmio->paddr + off;
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*lmmio->ptr = (void *)new_addr;
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}
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}
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if ((map_start <= (uintptr_t)systab.tables) &&
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(map_end >= (uintptr_t)systab.tables)) {
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char *ptr = (char *)systab.tables;
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ptr += off;
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systab.tables = (struct efi_configuration_table *)ptr;
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}
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}
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/* Move the actual runtime code over */
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for (i = 0; i < n; i++) {
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struct efi_mem_desc *map;
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map = (void*)virtmap + (descriptor_size * i);
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if (map->type == EFI_RUNTIME_SERVICES_CODE) {
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ulong new_offset = map->virtual_start -
|
|
map->physical_start + gd->relocaddr;
|
|
|
|
efi_runtime_relocate(new_offset, map);
|
|
/* Once we're virtual, we can no longer handle
|
|
complex callbacks */
|
|
efi_runtime_detach(new_offset);
|
|
return EFI_EXIT(EFI_SUCCESS);
|
|
}
|
|
}
|
|
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
}
|
|
|
|
/**
|
|
* efi_add_runtime_mmio() - add memory-mapped IO region
|
|
*
|
|
* This function adds a memory-mapped IO region to the memory map to make it
|
|
* available at runtime.
|
|
*
|
|
* @mmio_ptr: pointer to a pointer to the start of the memory-mapped
|
|
* IO region
|
|
* @len: size of the memory-mapped IO region
|
|
* Returns: status code
|
|
*/
|
|
efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
|
|
{
|
|
struct efi_runtime_mmio_list *newmmio;
|
|
u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
|
|
uint64_t addr = *(uintptr_t *)mmio_ptr;
|
|
uint64_t retaddr;
|
|
|
|
retaddr = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
|
|
if (retaddr != addr)
|
|
return EFI_OUT_OF_RESOURCES;
|
|
|
|
newmmio = calloc(1, sizeof(*newmmio));
|
|
if (!newmmio)
|
|
return EFI_OUT_OF_RESOURCES;
|
|
newmmio->ptr = mmio_ptr;
|
|
newmmio->paddr = *(uintptr_t *)mmio_ptr;
|
|
newmmio->len = len;
|
|
list_add_tail(&newmmio->link, &efi_runtime_mmio);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* In the second stage, U-Boot has disappeared. To isolate our runtime code
|
|
* that at this point still exists from the rest, we put it into a special
|
|
* section.
|
|
*
|
|
* !!WARNING!!
|
|
*
|
|
* This means that we can not rely on any code outside of this file in any
|
|
* function or variable below this line.
|
|
*
|
|
* Please keep everything fully self-contained and annotated with
|
|
* __efi_runtime and __efi_runtime_data markers.
|
|
*/
|
|
|
|
/*
|
|
* Relocate the EFI runtime stub to a different place. We need to call this
|
|
* the first time we expose the runtime interface to a user and on set virtual
|
|
* address map calls.
|
|
*/
|
|
|
|
/**
|
|
* efi_unimplemented() - replacement function, returns EFI_UNSUPPORTED
|
|
*
|
|
* This function is used after SetVirtualAddressMap() is called as replacement
|
|
* for services that are not available anymore due to constraints of the U-Boot
|
|
* implementation.
|
|
*
|
|
* Return: EFI_UNSUPPORTED
|
|
*/
|
|
static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void)
|
|
{
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
/**
|
|
* efi_device_error() - replacement function, returns EFI_DEVICE_ERROR
|
|
*
|
|
* This function is used after SetVirtualAddressMap() is called as replacement
|
|
* for services that are not available anymore due to constraints of the U-Boot
|
|
* implementation.
|
|
*
|
|
* Return: EFI_DEVICE_ERROR
|
|
*/
|
|
static efi_status_t __efi_runtime EFIAPI efi_device_error(void)
|
|
{
|
|
return EFI_DEVICE_ERROR;
|
|
}
|
|
|
|
/**
|
|
* efi_invalid_parameter() - replacement function, returns EFI_INVALID_PARAMETER
|
|
*
|
|
* This function is used after SetVirtualAddressMap() is called as replacement
|
|
* for services that are not available anymore due to constraints of the U-Boot
|
|
* implementation.
|
|
*
|
|
* Return: EFI_INVALID_PARAMETER
|
|
*/
|
|
static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void)
|
|
{
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
/**
|
|
* efi_update_capsule() - process information from operating system
|
|
*
|
|
* This function implements the UpdateCapsule() runtime service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details.
|
|
*
|
|
* @capsule_header_array: pointer to array of virtual pointers
|
|
* @capsule_count: number of pointers in capsule_header_array
|
|
* @scatter_gather_list: pointer to arry of physical pointers
|
|
* Returns: status code
|
|
*/
|
|
efi_status_t __efi_runtime EFIAPI efi_update_capsule(
|
|
struct efi_capsule_header **capsule_header_array,
|
|
efi_uintn_t capsule_count,
|
|
u64 scatter_gather_list)
|
|
{
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
/**
|
|
* efi_query_capsule_caps() - check if capsule is supported
|
|
*
|
|
* This function implements the QueryCapsuleCapabilities() runtime service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details.
|
|
*
|
|
* @capsule_header_array: pointer to array of virtual pointers
|
|
* @capsule_count: number of pointers in capsule_header_array
|
|
* @maximum_capsule_size: maximum capsule size
|
|
* @reset_type: type of reset needed for capsule update
|
|
* Returns: status code
|
|
*/
|
|
efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps(
|
|
struct efi_capsule_header **capsule_header_array,
|
|
efi_uintn_t capsule_count,
|
|
u64 *maximum_capsule_size,
|
|
u32 *reset_type)
|
|
{
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
/**
|
|
* efi_query_variable_info() - get information about EFI variables
|
|
*
|
|
* This function implements the QueryVariableInfo() runtime service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details.
|
|
*
|
|
* @attributes: bitmask to select variables to be
|
|
* queried
|
|
* @maximum_variable_storage_size: maximum size of storage area for the
|
|
* selected variable types
|
|
* @remaining_variable_storage_size: remaining size of storage are for the
|
|
* selected variable types
|
|
* @maximum_variable_size: maximum size of a variable of the
|
|
* selected type
|
|
* Returns: status code
|
|
*/
|
|
efi_status_t __efi_runtime EFIAPI efi_query_variable_info(
|
|
u32 attributes,
|
|
u64 *maximum_variable_storage_size,
|
|
u64 *remaining_variable_storage_size,
|
|
u64 *maximum_variable_size)
|
|
{
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
|
|
.hdr = {
|
|
.signature = EFI_RUNTIME_SERVICES_SIGNATURE,
|
|
.revision = EFI_SPECIFICATION_VERSION,
|
|
.headersize = sizeof(struct efi_runtime_services),
|
|
},
|
|
.get_time = &efi_get_time_boottime,
|
|
.set_time = (void *)&efi_device_error,
|
|
.get_wakeup_time = (void *)&efi_unimplemented,
|
|
.set_wakeup_time = (void *)&efi_unimplemented,
|
|
.set_virtual_address_map = &efi_set_virtual_address_map,
|
|
.convert_pointer = (void *)&efi_invalid_parameter,
|
|
.get_variable = efi_get_variable,
|
|
.get_next_variable_name = efi_get_next_variable_name,
|
|
.set_variable = efi_set_variable,
|
|
.get_next_high_mono_count = (void *)&efi_device_error,
|
|
.reset_system = &efi_reset_system_boottime,
|
|
.update_capsule = efi_update_capsule,
|
|
.query_capsule_caps = efi_query_capsule_caps,
|
|
.query_variable_info = efi_query_variable_info,
|
|
};
|