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x86: efi: payload: Install E820 map from EFI memory map

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This implements payload-specific install_e820_map() to get E820 map
from the EFI memory map descriptors.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2018-08-23 08:24:08 -07:00
parent 11ed312896
commit aac79251c7
1 changed files with 82 additions and 0 deletions
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82
arch/x86/cpu/efi/payload.c
View file

@ -8,6 +8,7 @@
#include <efi.h>
#include <errno.h>
#include <usb.h>
#include <asm/e820.h>
#include <asm/post.h>
DECLARE_GLOBAL_DATA_PTR;
@ -168,3 +169,84 @@ int last_stage_init(void)
return 0;
}
unsigned int install_e820_map(unsigned int max_entries,
struct e820_entry *entries)
{
struct efi_mem_desc *desc, *end;
struct efi_entry_memmap *map;
int size, ret;
efi_physical_addr_t last_end_addr = 0;
struct e820_entry *last_entry = NULL;
__u32 e820_type;
unsigned int num_entries = 0;
ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
if (ret) {
printf("Cannot find EFI memory map tables, ret=%d\n", ret);
return -ENODEV;
}
end = (struct efi_mem_desc *)((ulong)map + size);
for (desc = map->desc; desc < end;
desc = efi_get_next_mem_desc(map, desc)) {
if (desc->num_pages == 0)
continue;
switch (desc->type) {
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
e820_type = E820_RAM;
break;
case EFI_RESERVED_MEMORY_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
case EFI_MMAP_IO:
case EFI_MMAP_IO_PORT:
case EFI_PAL_CODE:
e820_type = E820_RESERVED;
break;
case EFI_ACPI_RECLAIM_MEMORY:
e820_type = E820_ACPI;
break;
case EFI_ACPI_MEMORY_NVS:
e820_type = E820_NVS;
break;
case EFI_UNUSABLE_MEMORY:
e820_type = E820_UNUSABLE;
break;
default:
printf("Invalid EFI memory descriptor type (0x%x)!\n",
desc->type);
continue;
}
if (last_entry != NULL && last_entry->type == e820_type &&
desc->physical_start == last_end_addr) {
last_entry->size += (desc->num_pages << EFI_PAGE_SHIFT);
last_end_addr += (desc->num_pages << EFI_PAGE_SHIFT);
} else {
if (num_entries >= E820MAX)
break;
entries[num_entries].addr = desc->physical_start;
entries[num_entries].size = desc->num_pages;
entries[num_entries].size <<= EFI_PAGE_SHIFT;
entries[num_entries].type = e820_type;
last_entry = &entries[num_entries];
last_end_addr = last_entry->addr + last_entry->size;
num_entries++;
}
}
return num_entries;
}