a46d674068
The variadic efi_call_phys() wrapper that exists on i386 was originally created to call into any EFI firmware runtime service, but in practice, we only use it once, to call SetVirtualAddressMap() during early boot. The flexibility provided by the variadic nature also makes it type unsafe, and makes the assembler code more complicated than needed, since it has to deal with an unknown number of arguments living on the stack. So clean this up, by renaming the helper to efi_call_svam(), and dropping the unneeded complexity. Let's also drop the reference to the efi_phys struct and grab the address from the EFI system table directly. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Arvind Sankar <nivedita@alum.mit.edu> Cc: Matthew Garrett <mjg59@google.com> Cc: linux-efi@vger.kernel.org Link: https://lkml.kernel.org/r/20200103113953.9571-9-ardb@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Extensible Firmware Interface
|
|
*
|
|
* Based on Extensible Firmware Interface Specification version 1.0
|
|
*
|
|
* Copyright (C) 1999 VA Linux Systems
|
|
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
|
|
* Copyright (C) 1999-2002 Hewlett-Packard Co.
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
* Stephane Eranian <eranian@hpl.hp.com>
|
|
*
|
|
* All EFI Runtime Services are not implemented yet as EFI only
|
|
* supports physical mode addressing on SoftSDV. This is to be fixed
|
|
* in a future version. --drummond 1999-07-20
|
|
*
|
|
* Implemented EFI runtime services and virtual mode calls. --davidm
|
|
*
|
|
* Goutham Rao: <goutham.rao@intel.com>
|
|
* Skip non-WB memory and ignore empty memory ranges.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/efi.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/efi.h>
|
|
|
|
/*
|
|
* To make EFI call EFI runtime service in physical addressing mode we need
|
|
* prolog/epilog before/after the invocation to claim the EFI runtime service
|
|
* handler exclusively and to duplicate a memory mapping in low memory space,
|
|
* say 0 - 3G.
|
|
*/
|
|
|
|
int __init efi_alloc_page_tables(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void efi_sync_low_kernel_mappings(void) {}
|
|
|
|
void __init efi_dump_pagetable(void)
|
|
{
|
|
#ifdef CONFIG_EFI_PGT_DUMP
|
|
ptdump_walk_pgd_level(NULL, swapper_pg_dir);
|
|
#endif
|
|
}
|
|
|
|
int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void __init efi_map_region(efi_memory_desc_t *md)
|
|
{
|
|
old_map_region(md);
|
|
}
|
|
|
|
void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
|
|
void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
|
|
|
|
efi_status_t efi_call_svam(efi_set_virtual_address_map_t *__efiapi *,
|
|
u32, u32, u32, void *);
|
|
|
|
efi_status_t __init efi_set_virtual_address_map(unsigned long memory_map_size,
|
|
unsigned long descriptor_size,
|
|
u32 descriptor_version,
|
|
efi_memory_desc_t *virtual_map)
|
|
{
|
|
struct desc_ptr gdt_descr;
|
|
efi_status_t status;
|
|
unsigned long flags;
|
|
pgd_t *save_pgd;
|
|
|
|
/* Current pgd is swapper_pg_dir, we'll restore it later: */
|
|
save_pgd = swapper_pg_dir;
|
|
load_cr3(initial_page_table);
|
|
__flush_tlb_all();
|
|
|
|
gdt_descr.address = get_cpu_gdt_paddr(0);
|
|
gdt_descr.size = GDT_SIZE - 1;
|
|
load_gdt(&gdt_descr);
|
|
|
|
/* Disable interrupts around EFI calls: */
|
|
local_irq_save(flags);
|
|
status = efi_call_svam(&efi.systab->runtime->set_virtual_address_map,
|
|
memory_map_size, descriptor_size,
|
|
descriptor_version, virtual_map);
|
|
local_irq_restore(flags);
|
|
|
|
load_fixmap_gdt(0);
|
|
load_cr3(save_pgd);
|
|
__flush_tlb_all();
|
|
|
|
return status;
|
|
}
|
|
|
|
void __init efi_runtime_update_mappings(void)
|
|
{
|
|
if (__supported_pte_mask & _PAGE_NX)
|
|
runtime_code_page_mkexec();
|
|
}
|