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efi_loader: split off detaching SetVirtualAddress()

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The runtime services SetVirtualAddress() and ConvertPointer() become
unavailable after SetVirtualAddress(). Other runtime services become
unavailable after ExitBootServices.

Move the update of SetVirtualAddress() and ConvertPointer() to
efi_relocate_runtime_table().

Use functions with the correct signature when detaching.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-06-29 03:32:52 +02:00
parent 1bb52fc2d2
commit ee8ebaaaae
1 changed files with 58 additions and 11 deletions
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69
lib/efi_loader/efi_runtime.c
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@ -395,10 +395,6 @@ static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
/* do_reset is gone */
.ptr = &efi_runtime_services.reset_system,
.patchto = efi_reset_system,
}, {
/* invalidate_*cache_all are gone */
.ptr = &efi_runtime_services.set_virtual_address_map,
.patchto = &efi_unimplemented,
}, {
/* RTC accessors are gone */
.ptr = &efi_runtime_services.get_time,
@ -439,6 +435,50 @@ static __efi_runtime void efi_runtime_detach(void)
}
}
/**
* efi_set_virtual_address_map_runtime() - change from physical to virtual
* mapping
*
* This function implements the SetVirtualAddressMap() runtime service after
* it is first called.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @memory_map_size: size of the virtual map
* @descriptor_size: size of an entry in the map
* @descriptor_version: version of the map entries
* @virtmap: virtual address mapping information
* Return: status code EFI_UNSUPPORTED
*/
static efi_status_t EFIAPI efi_set_virtual_address_map_runtime(
unsigned long memory_map_size,
unsigned long descriptor_size,
uint32_t descriptor_version,
struct efi_mem_desc *virtmap)
{
return EFI_UNSUPPORTED;
}
/**
* efi_convert_pointer_runtime() - convert from physical to virtual pointer
*
* This function implements the ConvertPointer() runtime service after
* 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_runtime(
efi_uintn_t debug_disposition, void **address)
{
return EFI_UNSUPPORTED;
}
static __efi_runtime void efi_relocate_runtime_table(ulong offset)
{
ulong patchoff;
@ -448,16 +488,23 @@ static __efi_runtime void efi_relocate_runtime_table(ulong offset)
patchoff = offset - gd->relocaddr;
for (pos = (void **)&efi_runtime_services.get_time;
pos <= (void **)&efi_runtime_services.query_variable_info; ++pos) {
/*
* The UEFI spec requires not to update VirtualAddressMap()
* and ConvertPointer().
*/
if (*pos && pos !=
(void **)&efi_runtime_services.set_virtual_address_map &&
pos != (void **)&efi_runtime_services.convert_pointer)
if (*pos)
*pos += patchoff;
}
/*
* The entry for SetVirtualAddress() must point to a physical address.
* After the first execution the service must return EFI_UNSUPPORTED.
*/
efi_runtime_services.set_virtual_address_map =
&efi_set_virtual_address_map_runtime;
/*
* The entry for ConvertPointer() must point to a physical address.
* The service is not usable after SetVirtualAddress().
*/
efi_runtime_services.convert_pointer = &efi_convert_pointer_runtime;
/* Update CRC32 */
efi_update_table_header_crc32(&efi_runtime_services.hdr);
}