On 01/14/2018 04:27 AM, Heinrich Schuchardt wrote:
On the x86 architecture the e820 BIOS table defines reserved memory.
Mark it as EFI reserved memory.
Hello Simon, hello Bin,
is there a place in the x86 start up code where we could put the new
e820_memory_reservation() function?
Putting this into the EFI mainline code is a bit awkward.
Best regards
Heinrich
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
lib/efi_loader/efi_memory.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index aaf64421a3..bee0a0c97d 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -10,6 +10,9 @@
#include <efi_loader.h>
#include <malloc.h>
#include <asm/global_data.h>
+#ifdef CONFIG_X86
+#include <asm/e820.h>
+#endif
#include <libfdt_env.h>
#include <linux/list_sort.h>
#include <inttypes.h>
@@ -493,6 +496,30 @@ __weak void efi_add_known_memory(void)
}
}
+/*
+ * Create reservations according to the BIOS e820 table.
+ */
+static void e820_memory_reservation(void)
+{
+#ifdef CONFIG_X86
+ struct e820entry e820[32];
+ unsigned int i, num;
+ unsigned long start, pages;
+
+ num = install_e820_map(ARRAY_SIZE(e820), e820);
+
+ for (i = 0; i < num; ++i) {
+ if (e820[i].type == E820_RESERVED) {
+ start = e820[i].addr;
+ pages = ALIGN(e820[i].size, EFI_PAGE_SIZE) >>
+ EFI_PAGE_SHIFT;
+ efi_add_memory_map(start, pages,
+ EFI_RESERVED_MEMORY_TYPE, false);
+ }
+ }
+#endif
+}
+
int efi_memory_init(void)
{
unsigned long runtime_start, runtime_end, runtime_pages;
@@ -525,6 +552,7 @@ int efi_memory_init(void)
efi_bounce_buffer = (void*)(uintptr_t)efi_bounce_buffer_addr;
#endif
+ e820_memory_reservation();
return 0;
}
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