x86 boot: use E820 memory map on EFI 32 platform

Because the EFI memory map are converted to e820 memory map in bootloader, the
EFI memory map handling code is removed to clean up.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
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>

1 files changed, 10 insertions, 107 deletions

diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index 56335a85a15a..931934a7b353 100644
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -7,7 +7,6 @@
 #include <linux/kexec.h>
 #include <linux/module.h>
 #include <linux/mm.h>
-#include <linux/efi.h>
 #include <linux/pfn.h>
 #include <linux/uaccess.h>
 #include <linux/suspend.h>
@@ -181,7 +180,7 @@ static void __init probe_roms(void)
  * Request address space for all standard RAM and ROM resources
  * and also for regions reported as reserved by the e820.
  */
-void __init legacy_init_iomem_resources(struct resource *code_resource,
+void __init init_iomem_resources(struct resource *code_resource,
                 struct resource *data_resource,
                 struct resource *bss_resource)
 {
@@ -261,19 +260,17 @@ void __init add_memory_region(unsigned long long start,
 {
         int x;
 
-        if (!efi_enabled) {
-                x = e820.nr_map;
+        x = e820.nr_map;
 
-                if (x == E820MAX) {
-                    printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
-                    return;
-                }
-
-                e820.map[x].addr = start;
-                e820.map[x].size = size;
-                e820.map[x].type = type;
-                e820.nr_map++;
+        if (x == E820MAX) {
+                printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
+                return;
         }
+
+        e820.map[x].addr = start;
+        e820.map[x].size = size;
+        e820.map[x].type = type;
+        e820.nr_map++;
 } /* add_memory_region */
 
 /*
@@ -489,29 +486,6 @@ int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 }
 
 /*
- * Callback for efi_memory_walk.
- */
-static int __init
-efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
-{
-        unsigned long *max_pfn = arg, pfn;
-
-        if (start < end) {
-                pfn = PFN_UP(end -1);
-                if (pfn > *max_pfn)
-                        *max_pfn = pfn;
-        }
-        return 0;
-}
-
-static int __init
-efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
-{
-        memory_present(0, PFN_UP(start), PFN_DOWN(end));
-        return 0;
-}
-
-/*
  * Find the highest page frame number we have available
  */
 void __init find_max_pfn(void)
@@ -519,11 +493,6 @@ void __init find_max_pfn(void)
         int i;
 
         max_pfn = 0;
-        if (efi_enabled) {
-                efi_memmap_walk(efi_find_max_pfn, &max_pfn);
-                efi_memmap_walk(efi_memory_present_wrapper, NULL);
-                return;
-        }
 
         for (i = 0; i < e820.nr_map; i++) {
                 unsigned long start, end;
@@ -541,34 +510,12 @@ void __init find_max_pfn(void)
 }
 
 /*
- * Free all available memory for boot time allocation.  Used
- * as a callback function by efi_memory_walk()
- */
-
-static int __init
-free_available_memory(unsigned long start, unsigned long end, void *arg)
-{
-        /* check max_low_pfn */
-        if (start >= (max_low_pfn << PAGE_SHIFT))
-                return 0;
-        if (end >= (max_low_pfn << PAGE_SHIFT))
-                end = max_low_pfn << PAGE_SHIFT;
-        if (start < end)
-                free_bootmem(start, end - start);
-
-        return 0;
-}
-/*
  * Register fully available low RAM pages with the bootmem allocator.
  */
 void __init register_bootmem_low_pages(unsigned long max_low_pfn)
 {
         int i;
 
-        if (efi_enabled) {
-                efi_memmap_walk(free_available_memory, NULL);
-                return;
-        }
         for (i = 0; i < e820.nr_map; i++) {
                 unsigned long curr_pfn, last_pfn, size;
                 /*
@@ -676,56 +623,12 @@ void __init print_memory_map(char *who)
         }
 }
 
-static __init __always_inline void efi_limit_regions(unsigned long long size)
-{
-        unsigned long long current_addr = 0;
-        efi_memory_desc_t *md, *next_md;
-        void *p, *p1;
-        int i, j;
-
-        j = 0;
-        p1 = memmap.map;
-        for (p = p1, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
-                md = p;
-                next_md = p1;
-                current_addr = md->phys_addr +
-                        PFN_PHYS(md->num_pages);
-                if (is_available_memory(md)) {
-                        if (md->phys_addr >= size) continue;
-                        memcpy(next_md, md, memmap.desc_size);
-                        if (current_addr >= size) {
-                                next_md->num_pages -=
-                                        PFN_UP(current_addr-size);
-                        }
-                        p1 += memmap.desc_size;
-                        next_md = p1;
-                        j++;
-                } else if ((md->attribute & EFI_MEMORY_RUNTIME) ==
-                           EFI_MEMORY_RUNTIME) {
-                        /* In order to make runtime services
-                         * available we have to include runtime
-                         * memory regions in memory map */
-                        memcpy(next_md, md, memmap.desc_size);
-                        p1 += memmap.desc_size;
-                        next_md = p1;
-                        j++;
-                }
-        }
-        memmap.nr_map = j;
-        memmap.map_end = memmap.map +
-                (memmap.nr_map * memmap.desc_size);
-}
-
 void __init limit_regions(unsigned long long size)
 {
         unsigned long long current_addr;
         int i;
 
         print_memory_map("limit_regions start");
-        if (efi_enabled) {
-                efi_limit_regions(size);
-                return;
-        }
         for (i = 0; i < e820.nr_map; i++) {
                 current_addr = e820.map[i].addr + e820.map[i].size;
                 if (current_addr < size)