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efi_loader: implement ConvertPointer()

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Implement the ConvertPointer() runtime service.

Suggested-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-07-27 20:35:24 +02:00
parent 24e6722b8a
commit 7be56e864e
1 changed files with 71 additions and 4 deletions
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75
lib/efi_loader/efi_runtime.c
View file

@ -81,6 +81,10 @@ struct elf_rela {
long addend;
};
static __efi_runtime_data struct efi_mem_desc *efi_virtmap;
static __efi_runtime_data efi_uintn_t efi_descriptor_count;
static __efi_runtime_data efi_uintn_t efi_descriptor_size;
/*
* EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
* payload are running concurrently at the same time. In this mode, we can
@ -89,7 +93,9 @@ struct elf_rela {
efi_status_t efi_init_runtime_supported(void)
{
u16 efi_runtime_services_supported = 0;
u16 efi_runtime_services_supported =
EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP |
EFI_RT_SUPPORTED_CONVERT_POINTER;
/*
* This value must be synced with efi_runtime_detach_list
@ -98,8 +104,7 @@ efi_status_t efi_init_runtime_supported(void)
#ifdef CONFIG_EFI_HAVE_RUNTIME_RESET
efi_runtime_services_supported |= EFI_RT_SUPPORTED_RESET_SYSTEM;
#endif
efi_runtime_services_supported |=
EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP;
return EFI_CALL(efi_set_variable(L"RuntimeServicesSupported",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
@ -454,6 +459,58 @@ static __efi_runtime efi_status_t EFIAPI efi_convert_pointer_runtime(
return EFI_UNSUPPORTED;
}
/**
* efi_convert_pointer_runtime() - convert from physical to virtual pointer
*
* This function implements the ConvertPointer() runtime service until
* the first call to SetVirtualAddressMap().
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @debug_disposition: indicates if pointer may be converted to NULL
* @address: pointer to be converted
* Return: status code EFI_UNSUPPORTED
*/
static __efi_runtime efi_status_t EFIAPI efi_convert_pointer(
efi_uintn_t debug_disposition, void **address)
{
efi_physical_addr_t addr = (uintptr_t)*address;
efi_uintn_t i;
efi_status_t ret = EFI_NOT_FOUND;
EFI_ENTRY("%zu %p", debug_disposition, address);
if (!efi_virtmap) {
ret = EFI_UNSUPPORTED;
goto out;
}
if (!address) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
for (i = 0; i < efi_descriptor_count; i++) {
struct efi_mem_desc *map = (void *)efi_virtmap +
(efi_descriptor_size * i);
if (addr >= map->physical_start &&
(addr < map->physical_start
+ (map->num_pages << EFI_PAGE_SHIFT))) {
*address = (void *)(uintptr_t)
(addr + map->virtual_start -
map->physical_start);
ret = EFI_SUCCESS;
break;
}
}
out:
return EFI_EXIT(ret);
}
static __efi_runtime void efi_relocate_runtime_table(ulong offset)
{
ulong patchoff;
@ -480,6 +537,12 @@ static __efi_runtime void efi_relocate_runtime_table(ulong offset)
*/
efi_runtime_services.convert_pointer = &efi_convert_pointer_runtime;
/*
* TODO: Update UEFI variable RuntimeServicesSupported removing flags
* EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP and
* EFI_RT_SUPPORTED_CONVERT_POINTER as required by the UEFI spec 2.8.
*/
/* Update CRC32 */
efi_update_table_header_crc32(&efi_runtime_services.hdr);
}
@ -584,6 +647,10 @@ static efi_status_t EFIAPI efi_set_virtual_address_map(
EFI_ENTRY("%zx %zx %x %p", memory_map_size, descriptor_size,
descriptor_version, virtmap);
efi_virtmap = virtmap;
efi_descriptor_size = descriptor_size;
efi_descriptor_count = n;
/*
* TODO:
* Further down we are cheating. While really we should implement
@ -800,7 +867,7 @@ struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
.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_unimplemented,
.convert_pointer = efi_convert_pointer,
.get_variable = efi_get_variable,
.get_next_variable_name = efi_get_next_variable_name,
.set_variable = efi_set_variable,