mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 04:16:42 +07:00
f7d9248942
This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
|
|
* Extensible Firmware Interface
|
|
*
|
|
* Based on Extensible Firmware Interface Specification version 2.4
|
|
*
|
|
* Copyright (C) 2013, 2014 Linaro Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/dmi.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/efi.h>
|
|
|
|
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
|
|
{
|
|
pteval_t prot_val;
|
|
|
|
/*
|
|
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
|
|
* executable, everything else can be mapped with the XN bits
|
|
* set.
|
|
*/
|
|
if ((md->attribute & EFI_MEMORY_WB) == 0)
|
|
prot_val = PROT_DEVICE_nGnRE;
|
|
else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
|
|
!PAGE_ALIGNED(md->phys_addr))
|
|
prot_val = pgprot_val(PAGE_KERNEL_EXEC);
|
|
else
|
|
prot_val = pgprot_val(PAGE_KERNEL);
|
|
|
|
create_pgd_mapping(mm, md->phys_addr, md->virt_addr,
|
|
md->num_pages << EFI_PAGE_SHIFT,
|
|
__pgprot(prot_val | PTE_NG));
|
|
return 0;
|
|
}
|
|
|
|
static int __init arm64_dmi_init(void)
|
|
{
|
|
/*
|
|
* On arm64, DMI depends on UEFI, and dmi_scan_machine() needs to
|
|
* be called early because dmi_id_init(), which is an arch_initcall
|
|
* itself, depends on dmi_scan_machine() having been called already.
|
|
*/
|
|
dmi_scan_machine();
|
|
if (dmi_available)
|
|
dmi_set_dump_stack_arch_desc();
|
|
return 0;
|
|
}
|
|
core_initcall(arm64_dmi_init);
|
|
|
|
/*
|
|
* UpdateCapsule() depends on the system being shutdown via
|
|
* ResetSystem().
|
|
*/
|
|
bool efi_poweroff_required(void)
|
|
{
|
|
return efi_enabled(EFI_RUNTIME_SERVICES);
|
|
}
|