elilo/elilo-high_base_mem.diff

---
 x86_64/system.c |   31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

--- a/x86_64/system.c
+++ b/x86_64/system.c
@@ -44,7 +44,9 @@
 #include "loader.h"
 #include "rmswitch.h"
 
+#ifndef DEBUG_CREATE_BOOT_PARAMS
 #define DEBUG_CREATE_BOOT_PARAMS 0
+#endif
 #if DEBUG_CREATE_BOOT_PARAMS
 #define DPR(a) do { if (elilo_opt.debug) { Print a; } } while ( 0 )
 #else
@@ -100,6 +102,7 @@ UINTN sizeof_init_gdt = sizeof init_gdt;
  */
 
 UINTN high_base_mem = 0x90000;
+VOID *high_base_mem_address = NULL;
 
 /*
  * Highest available extended memory address.
@@ -128,6 +131,30 @@ sysdeps_init(EFI_HANDLE dev)
 {
 	DBG_PRT((L"sysdeps_init()\n"));
 
+	DBG_PRT((L"fix high_base_mem and gdt_addr\n"));
+	while (!high_base_mem_address) {
+		high_base_mem_address = alloc_pages(5, EfiLoaderData,
+						AllocateAddress,
+						(void *)high_base_mem);
+		if (!high_base_mem_address) {
+			if (high_base_mem > (1 << 16)) {
+				high_base_mem -= (1 << 16);
+			} else {
+				/* fall back to previous behavior */
+				high_base_mem = 0x90000;
+				break;
+			}
+		}
+	}
+	if (high_base_mem_address) {
+		VERB_PRT(3, Print(L"high_base_mem="PTR_FMT"\n",
+			high_base_mem_address));
+		gdt_addr.base = high_base_mem + 0x4000;
+	} else {
+		ERR_PRT((L"Failed to allocate high_base_mem, "
+			"stomping over heritage 0x90000.\n"));
+	}
+
 	/*
 	 * Register our loader(s)...
 	 */
@@ -624,6 +651,10 @@ sysdeps_create_boot_params(
 		ERR_PRT((L"bp="PTR_FMT"  cmdline="PTR_FMT"  initrd="PTR_FMT" cookie="PTR_FMT"",
 			bp, cmdline, initrd, cookie));
 
+		if (high_base_mem_address != NULL) {
+			free(high_base_mem_address);
+			high_base_mem_address = NULL;
+		}
 		if (param_start != NULL) {
 			free(param_start);
 			param_start = NULL;