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---
grub-core/kern/mm.c | 10 ++++++++++
include/grub/mm.h | 16 ++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
index e0e580270..2df835392 100644
--- a/grub-core/kern/mm.c
+++ b/grub-core/kern/mm.c
@@ -81,6 +81,7 @@
grub_mm_region_t grub_mm_base;
+grub_mm_add_region_func_t grub_mm_add_region_fn;
/* Get a header from the pointer PTR, and set *P and *R to a pointer
to the header and a pointer to its region, respectively. PTR must
@@ -360,6 +361,15 @@ grub_memalign (grub_size_t align, grub_size_t size)
count++;
goto again;
+ case 1:
+ /* Request additional pages. */
+ count++;
+
+ if (grub_mm_add_region_fn && grub_mm_add_region_fn (size, GRUB_MM_ADD_REGION_CONSECUTIVE) == GRUB_ERR_NONE)
+ goto again;
+
+ /* fallthrough */
+
default:
break;
}
diff --git a/include/grub/mm.h b/include/grub/mm.h
index 9c38dd3ca..afde57d2e 100644
--- a/include/grub/mm.h
+++ b/include/grub/mm.h
@@ -20,6 +20,7 @@
#ifndef GRUB_MM_H
#define GRUB_MM_H 1
+#include <grub/err.h>
#include <grub/types.h>
#include <grub/symbol.h>
#include <config.h>
@@ -28,6 +29,21 @@
# define NULL ((void *) 0)
#endif
+#define GRUB_MM_ADD_REGION_NONE 0
+#define GRUB_MM_ADD_REGION_CONSECUTIVE (1 << 0)
+
+/*
+ * Function used to request memory regions of `grub_size_t` bytes. The second
+ * parameter is a bitfield of `GRUB_MM_ADD_REGION` flags.
+ */
+typedef grub_err_t (*grub_mm_add_region_func_t) (grub_size_t, unsigned int);
+
+/*
+ * Set this function pointer to enable adding memory-regions at runtime in case
+ * a memory allocation cannot be satisfied with existing regions.
+ */
+extern grub_mm_add_region_func_t EXPORT_VAR(grub_mm_add_region_fn);
+
void grub_mm_init_region (void *addr, grub_size_t size);
void *EXPORT_FUNC(grub_calloc) (grub_size_t nmemb, grub_size_t size);
void *EXPORT_FUNC(grub_malloc) (grub_size_t size);
--
2.32.0
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|