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[PATCH] i386: Preserve EFI run time regions with memmap parameter 

When using memmap kernel parameter in EFI boot we should also add to memory map
memory regions of runtime services to enable their mapping later.

AK: merged and cleaned up the patch

Signed-off-by: Artiom Myaskouvskey <artiom.myaskouvskey@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Artiom Myaskouvskey 2006-12-07 02:14:11 +01:00 committed by Andi Kleen
parent f990fff427
commit bf7e6a1963
3 changed files with 44 additions and 19 deletions
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60
arch/i386/kernel/e820.c
View File

@ -742,29 +742,55 @@ void __init print_memory_map(char *who)
}
}
void __init limit_regions(unsigned long long size)
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_memory_desc_t *md;
void *p;
for (p = memmap.map, i = 0; p < memmap.map_end;
p += memmap.desc_size, i++) {
md = p;
current_addr = md->phys_addr + (md->num_pages << 12);
if (md->type == EFI_CONVENTIONAL_MEMORY) {
if (current_addr >= size) {
md->num_pages -=
(((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
memmap.nr_map = i + 1;
return;
}
}
}
efi_limit_regions(size);
return;
}
for (i = 0; i < e820.nr_map; i++) {
current_addr = e820.map[i].addr + e820.map[i].size;

2
arch/i386/mm/init.c
View File

@ -192,8 +192,6 @@ static inline int page_kills_ppro(unsigned long pagenr)
return 0;
}
extern int is_available_memory(efi_memory_desc_t *);
int page_is_ram(unsigned long pagenr)
{
int i;

1
include/linux/efi.h
View File

@ -302,6 +302,7 @@ extern void efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource);
extern unsigned long efi_get_time(void);
extern int __init efi_set_rtc_mmss(unsigned long nowtime);
extern int is_available_memory(efi_memory_desc_t * md);
extern struct efi_memory_map memmap;
/**