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x86: 32-bit EFI runtime service support: fixes in sync with 64-bit support 

support according to fixes of x86_64 support.

- Delete efi_rt_lock because it is used during system early boot,
  before SMP is initialized.

- Change local_flush_tlb() to __flush_tlb_all() to flush global page
  mapping.

- Clean up includes.

- Revise Kconfig description.

- Enable noefi kernel parameter on i386.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Huang, Ying 2008-01-30 13:32:11 +01:00 committed by Ingo Molnar
parent bfd074e05b
commit 8b2cb7a8f5
7 changed files with 25 additions and 45 deletions
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2
Documentation/kernel-parameters.txt
View File

@ -1169,6 +1169,8 @@ and is between 256 and 4096 characters. It is defined in the file
nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects.
noefi [X86-32,X86-64] Disable EFI runtime services support.
noexec [IA-64]
noexec [X86-32,X86-64]

4
Documentation/x86_64/boot-options.txt
View File

@ -306,8 +306,4 @@ Debugging
newfallback: use new unwinder but fall back to old if it gets
stuck (default)
EFI
noefi Disable EFI support
Miscellaneous

19
arch/x86/Kconfig
View File

@ -961,21 +961,18 @@ config MTRR
config EFI
def_bool n
prompt "Boot from EFI support"
prompt "EFI runtime service support"
depends on ACPI
---help---
This enables the kernel to boot on EFI platforms using
system configuration information passed to it from the firmware.
This also enables the kernel to use any EFI runtime services that are
This enables the kernel to use EFI runtime services that are
available (such as the EFI variable services).
This option is only useful on systems that have EFI firmware
and will result in a kernel image that is ~8k larger. In addition,
you must use the latest ELILO loader available at
<http://elilo.sourceforge.net> in order to take advantage of
kernel initialization using EFI information (neither GRUB nor LILO know
anything about EFI). However, even with this option, the resultant
kernel should continue to boot on existing non-EFI platforms.
This option is only useful on systems that have EFI firmware.
In addition, you should use the latest ELILO loader available
at <http://elilo.sourceforge.net> in order to take advantage
of EFI runtime services. However, even with this option, the
resultant kernel should continue to boot on existing non-EFI
platforms.
config IRQBALANCE
def_bool y

7
arch/x86/kernel/efi.c
View File

@ -55,6 +55,13 @@ struct efi_memory_map memmap;
struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;
static int __init setup_noefi(char *arg)
{
efi_enabled = 0;
return 0;
}
early_param("noefi", setup_noefi);
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
return efi_call_virt2(get_time, tm, tc);

25
arch/x86/kernel/efi_32.c
View File

@ -20,27 +20,15 @@
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/spinlock.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/kexec.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/tlbflush.h>
#define PFX "EFI: "
/*
* To make EFI call EFI runtime service in physical addressing mode we need
* prelog/epilog before/after the invocation to disable interrupt, to
@ -49,16 +37,14 @@
*/
static unsigned long efi_rt_eflags;
static DEFINE_SPINLOCK(efi_rt_lock);
static pgd_t efi_bak_pg_dir_pointer[2];
void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
void efi_call_phys_prelog(void)
{
unsigned long cr4;
unsigned long temp;
struct desc_ptr gdt_descr;
spin_lock(&efi_rt_lock);
local_irq_save(efi_rt_eflags);
/*
@ -88,14 +74,14 @@ void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
/*
* After the lock is released, the original page table is restored.
*/
local_flush_tlb();
__flush_tlb_all();
gdt_descr.address = __pa(get_cpu_gdt_table(0));
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
}
void efi_call_phys_epilog(void) __releases(efi_rt_lock)
void efi_call_phys_epilog(void)
{
unsigned long cr4;
struct desc_ptr gdt_descr;
@ -119,10 +105,9 @@ void efi_call_phys_epilog(void) __releases(efi_rt_lock)
/*
* After the lock is released, the original page table is restored.
*/
local_flush_tlb();
__flush_tlb_all();
local_irq_restore(efi_rt_eflags);
spin_unlock(&efi_rt_lock);
}
/*
@ -135,7 +120,7 @@ void __init efi_map_memmap(void)
memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
(memmap.nr_map * memmap.desc_size));
if (memmap.map == NULL)
printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
printk(KERN_ERR "Could not remap the EFI memmap!\n");
memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
}

7
arch/x86/kernel/efi_64.c
View File

@ -40,13 +40,6 @@
static pgd_t save_pgd __initdata;
static unsigned long efi_flags __initdata;
static int __init setup_noefi(char *arg)
{
efi_enabled = 0;
return 0;
}
early_param("noefi", setup_noefi);
static void __init early_mapping_set_exec(unsigned long start,
unsigned long end,
int executable)

6
arch/x86/kernel/setup_32.c
View File

@ -648,9 +648,6 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
print_memory_map(memory_setup());
if (efi_enabled)
efi_init();
copy_edd();
if (!boot_params.hdr.root_flags)
@ -677,6 +674,9 @@ void __init setup_arch(char **cmdline_p)
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
if (efi_enabled)
efi_init();
max_low_pfn = setup_memory();
#ifdef CONFIG_VMI