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

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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;
/**