diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index e5612f3..59c2075 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -332,7 +332,10 @@ int strncmp(const char *cs, const char *ct, size_t count);
 size_t strnlen(const char *s, size_t maxlen);
 unsigned int atou(const char *s);
 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
+unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base);
+long simple_strtol(const char *cp, char **endp, unsigned int base);
 size_t strlen(const char *s);
+char *strchr(const char *s, int c);
 
 /* tty.c */
 void puts(const char *);
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index a66854d..915509f 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -11,6 +11,7 @@
  */
 #include "misc.h"
 #include "error.h"
+#include "../boot.h"
 
 #include <generated/compile.h>
 #include <linux/module.h>
@@ -61,9 +62,16 @@ enum mem_avoid_index {
 	MEM_AVOID_INITRD,
 	MEM_AVOID_CMDLINE,
 	MEM_AVOID_BOOTPARAMS,
+	MEM_AVOID_MEMMAP1,
+	MEM_AVOID_MEMMAP2,
+	MEM_AVOID_MEMMAP3,
+	MEM_AVOID_MEMMAP4,
 	MEM_AVOID_MAX,
 };
 
+/* only supporting at most 4 memmap regions with kaslr */
+#define MAX_MEMMAP_REGIONS	4
+
 static struct mem_vector mem_avoid[MEM_AVOID_MAX];
 
 static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
@@ -77,6 +85,72 @@ static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
 	return true;
 }
 
+#include "../../../../lib/cmdline.c"
+
+static int
+parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
+{
+	char *oldp;
+
+	if (!p)
+		return -EINVAL;
+
+	/* we don't care about this option here */
+	if (!strncmp(p, "exactmap", 8))
+		return -EINVAL;
+
+	oldp = p;
+	*size = memparse(p, &p);
+	if (p == oldp)
+		return -EINVAL;
+
+	switch (*p) {
+	case '@':
+	case '#':
+	case '$':
+	case '!':
+		*start = memparse(p + 1, &p);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int mem_avoid_memmap(void)
+{
+	char arg[128];
+	int rc = 0;
+
+	/* see if we have any memmap areas */
+	if (cmdline_find_option("memmap", arg, sizeof(arg)) > 0) {
+		int i = 0;
+		char *str = arg;
+
+		while (str && (i < MAX_MEMMAP_REGIONS)) {
+			unsigned long long start, size;
+			char *k = strchr(str, ',');
+
+			if (k)
+				*k++ = 0;
+
+			rc = parse_memmap(str, &start, &size);
+			if (rc < 0)
+				break;
+			str = k;
+
+			mem_avoid[MEM_AVOID_MEMMAP1 + i].start = start;
+			mem_avoid[MEM_AVOID_MEMMAP1 + i].size = size;
+			i++;
+		}
+
+		/* more than 4 memmaps, fail kaslr */
+		if ((i >= MAX_MEMMAP_REGIONS) && str)
+			rc = -EINVAL;
+	}
+
+	return rc;
+}
+
 /*
  * In theory, KASLR can put the kernel anywhere in the range of [16M, 64T).
  * The mem_avoid array is used to store the ranges that need to be avoided
@@ -429,6 +503,7 @@ void choose_random_location(unsigned long input,
 			    unsigned long *virt_addr)
 {
 	unsigned long random_addr, min_addr;
+	int rc;
 
 	/* By default, keep output position unchanged. */
 	*virt_addr = *output;
@@ -438,6 +513,13 @@ void choose_random_location(unsigned long input,
 		return;
 	}
 
+	/* Mark the memmap regions we need to avoid */
+	rc = mem_avoid_memmap();
+	if (rc < 0) {
+		warn("KASLR disabled: memmap exceeds limit of 4, giving up.");
+		return;
+	}
+
 	boot_params->hdr.loadflags |= KASLR_FLAG;
 
 	/* Prepare to add new identity pagetables on demand. */
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index cc3bd58..0464aaa 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -122,6 +122,31 @@ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int bas
 }
 
 /**
+ * simple_strtoul - convert a string to an unsigned long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
+{
+	return simple_strtoull(cp, endp, base);
+}
+
+/**
+ * simple_strtol - convert a string to a signed long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+long simple_strtol(const char *cp, char **endp, unsigned int base)
+{
+	if (*cp == '-')
+		return -simple_strtoul(cp + 1, endp, base);
+
+	return simple_strtoul(cp, endp, base);
+}
+
+/**
  * strlen - Find the length of a string
  * @s: The string to be sized
  */
@@ -155,3 +180,16 @@ char *strstr(const char *s1, const char *s2)
 	}
 	return NULL;
 }
+
+/**
+ * strchr - Find the first occurrence of the character c in the string s.
+ * @s: the string to be searched
+ * @c: the character to search for
+ */
+char *strchr(const char *s, int c)
+{
+	while (*s != (char)c)
+		if (*s++ == '\0')
+			return NULL;
+	return (char *)s;
+}
