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>

5 files changed, 23 insertions, 41 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d89b94528153..fa6fa52248d9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index 0a61522e85c7..2939b015c2ed 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -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);
diff --git a/arch/x86/kernel/efi_32.c b/arch/x86/kernel/efi_32.c
index 30f937116288..afd2c3b039d6 100644
--- a/arch/x86/kernel/efi_32.c
+++ b/arch/x86/kernel/efi_32.c
@@ -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);
 }
diff --git a/arch/x86/kernel/efi_64.c b/arch/x86/kernel/efi_64.c
index f2000dbc7195..269de2e049a3 100644
--- a/arch/x86/kernel/efi_64.c
+++ b/arch/x86/kernel/efi_64.c
@@ -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)
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 2e805da337a2..704550fdb84c 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -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