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Subject[PATCH 1/1] Add efi e820 memory mapping on x86 [try #1]
This Patch add an efi e820 memory mapping.

Signed-off-by: Edgar Hucek <hostmaster@ed-soft.at>


diff -uNr linux-2.6.18-rc2/arch/i386/kernel/setup.c
linux-2.6.18-rc2.mactel/arch/i386/kernel/setup.c
--- linux-2.6.18-rc2/arch/i386/kernel/setup.c 2006-07-16
10:38:10.000000000 +0200
+++ linux-2.6.18-rc2.mactel/arch/i386/kernel/setup.c 2006-07-16
10:16:12.000000000 +0200
@@ -414,19 +414,17 @@
{
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 */

#define E820_DEBUG 1
@@ -1431,6 +1429,59 @@
#endif

/*
+ * Make a e820 memory map
+ */
+void __init efi_init_e820_map(void)
+{
+ efi_memory_desc_t *md;
+ unsigned long long start = 0;
+ unsigned long long end = 0;
+ unsigned long long size = 0;
+ void *p;
+
+ e820.nr_map = 0;
+
+ for (p = memmap.map; p < memmap.map_end;
+ p += memmap.desc_size) {
+ md = p;
+ switch (md->type) {
+ case EFI_ACPI_RECLAIM_MEMORY:
+ add_memory_region(md->phys_addr, md->num_pages <<
EFI_PAGE_SHIFT, E820_ACPI);
+ break;
+ case EFI_RUNTIME_SERVICES_CODE:
+ case EFI_RUNTIME_SERVICES_DATA:
+ case EFI_RESERVED_TYPE:
+ case EFI_MEMORY_MAPPED_IO:
+ case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
+ case EFI_UNUSABLE_MEMORY:
+ add_memory_region(md->phys_addr, md->num_pages <<
EFI_PAGE_SHIFT, E820_RESERVED);
+ break;
+ case EFI_LOADER_CODE:
+ case EFI_LOADER_DATA:
+ case EFI_BOOT_SERVICES_CODE:
+ case EFI_BOOT_SERVICES_DATA:
+ case EFI_CONVENTIONAL_MEMORY:
+ start = md->phys_addr;
+ size = md->num_pages << EFI_PAGE_SHIFT;
+ end = start + size;
+ if (start < 0x100000ULL && end > 0xA0000ULL) {
+ if (start < 0xA0000ULL)
+ add_memory_region(start, 0xA0000ULL-start, E820_RAM);
+ if (end <= 0x100000ULL)
+ continue;
+ start = 0x100000ULL;
+ size = end - start;
+ }
+ add_memory_region(start, size, E820_RAM);
+ break;
+ case EFI_ACPI_MEMORY_NVS:
+ add_memory_region(md->phys_addr, md->num_pages <<
EFI_PAGE_SHIFT, E820_NVS);
+ break;
+ }
+ }
+}
+
+/*
* Determine if we were loaded by an EFI loader. If so, then we have
also been
* passed the efi memmap, systab, etc., so we should use these data
structures
* for initialization. Note, the efi init code path is determined by the
@@ -1478,9 +1529,11 @@
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
ARCH_SETUP
- if (efi_enabled)
+ if (efi_enabled) {
efi_init();
- else {
+ efi_init_e820_map();
+ print_memory_map("BIOS-EFI");
+ } else {
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
print_memory_map(machine_specific_memory_setup());
}
-
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