Adding upstream version 2.06.upstream/2.06upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

17 files changed, 2083 insertions, 0 deletions

diff --git a/grub-core/kern/arm/cache.S b/grub-core/kern/arm/cache.S
new file mode 100644
index 0000000..354a069
--- /dev/null
+++ b/grub-core/kern/arm/cache.S
@@ -0,0 +1,123 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache.S"
+	.text
+	.syntax	unified
+#if !defined (__thumb2__) || !defined (ARMV7)
+	.arm
+#else
+	.thumb
+#endif
+
+#if !defined (ARMV6) && !defined (ARMV7)
+# error Unsupported architecture version!
+#endif
+
+	.align	2
+
+/*
+ * Simple cache maintenance functions
+ */
+
+@ r0 - *beg (inclusive)
+@ r1 - *end (exclusive)
+@void grub_arm_clean_dcache_range (grub_addr_t start, grub_addr_t end, grub_addr_t dlinesz)
+#ifdef ARMV6
+FUNCTION(grub_arm_clean_dcache_range_armv6)
+#else
+FUNCTION(grub_arm_clean_dcache_range_armv7)
+#endif
+	DSB
+	@ Clean data cache for range to point-of-unification
+1:	cmp	r0, r1
+	bge	2f
+#ifdef ARMV6
+	mcr	p15, 0, r0, c7, c10, 1	@ Clean data cache line by MVA
+#else
+	mcr	p15, 0, r0, c7, c11, 1	@ DCCMVAU
+#endif
+	add	r0, r0, r2		@ Next line
+	b	1b
+2:	DSB
+	bx	lr
+
+@ r0 - *beg (inclusive)
+@ r1 - *end (exclusive)
+#ifdef ARMV6
+FUNCTION(grub_arm_invalidate_icache_range_armv6)
+#else
+FUNCTION(grub_arm_invalidate_icache_range_armv7)
+#endif
+	@ Invalidate instruction cache for range to point-of-unification
+1:	cmp	r0, r1
+	bge	2f
+	mcr	p15, 0, r0, c7, c5, 1	@ ICIMVAU
+	add	r0, r0, r2		@ Next line
+	b	1b
+	@ Branch predictor invalidate all
+2:	mcr	p15, 0, r0, c7,	c5, 6	@ BPIALL
+	DSB
+	ISB
+	bx	lr
+
+#ifdef ARMV6
+FUNCTION(grub_arm_disable_caches_mmu_armv6)
+#else
+FUNCTION(grub_arm_disable_caches_mmu_armv7)
+#endif
+
+	push	{r4, lr}
+
+	@ disable D-cache
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 2)
+	mcr	p15, 0, r0, c1, c0, 0
+	DSB
+	ISB
+
+	@ clean/invalidate D-cache
+	bl	clean_invalidate_dcache
+
+	@ disable I-cache
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 12)
+	mcr	p15, 0, r0, c1, c0, 0
+	DSB
+	ISB
+
+	@ invalidate I-cache (also invalidates branch predictors)
+	mcr	p15, 0, r0, c7, c5, 0
+	DSB
+	ISB
+
+	@ clear SCTLR M bit
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 0)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mcr	p15, 0, r0, c8, c7, 0	@ invalidate TLB
+	mcr	p15, 0, r0, c7, c5, 6	@ invalidate branch predictor
+	DSB
+	ISB
+
+	pop	{r4, lr}
+	bx	lr
+
diff --git a/grub-core/kern/arm/cache.c b/grub-core/kern/arm/cache.c
new file mode 100644
index 0000000..6c75193
--- /dev/null
+++ b/grub-core/kern/arm/cache.c
@@ -0,0 +1,311 @@
+#include <grub/dl.h>
+#include <grub/cache.h>
+#include <grub/arm/system.h>
+#ifdef GRUB_MACHINE_UBOOT
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/api_public.h>
+#include <grub/mm.h>
+#endif
+
+/* This is only about cache architecture. It doesn't imply
+   the CPU architecture.  */
+static enum
+  {
+    ARCH_UNKNOWN,
+    ARCH_ARMV5_WRITE_THROUGH,
+    ARCH_ARMV6,
+    ARCH_ARMV6_UNIFIED,
+    ARCH_ARMV7
+  } type = ARCH_UNKNOWN;
+
+static int is_v6_mmu;
+
+static grub_uint32_t grub_arch_cache_dlinesz;
+static grub_uint32_t grub_arch_cache_ilinesz;
+static grub_uint32_t grub_arch_cache_max_linesz;
+
+/* Prototypes for asm functions.  */
+void grub_arm_clean_dcache_range_armv6 (grub_addr_t start, grub_addr_t end,
+					grub_addr_t dlinesz);
+void grub_arm_clean_dcache_range_armv7 (grub_addr_t start, grub_addr_t end,
+					grub_addr_t dlinesz);
+void grub_arm_clean_dcache_range_poc_armv7 (grub_addr_t start, grub_addr_t end,
+					    grub_addr_t dlinesz);
+void grub_arm_invalidate_icache_range_armv6 (grub_addr_t start, grub_addr_t end,
+					     grub_addr_t dlinesz);
+void grub_arm_invalidate_icache_range_armv7 (grub_addr_t start, grub_addr_t end,
+					     grub_addr_t dlinesz);
+void grub_arm_disable_caches_mmu_armv6 (void);
+void grub_arm_disable_caches_mmu_armv7 (void);
+grub_uint32_t grub_arm_main_id (void);
+grub_uint32_t grub_arm_cache_type (void);
+
+static void
+probe_caches (void)
+{
+  grub_uint32_t main_id, cache_type;
+
+  /* Read main ID Register */
+  main_id = grub_arm_main_id ();
+
+  switch ((main_id >> 16) & 0xf)
+    {
+    case 0x3:
+    case 0x4:
+    case 0x5:
+    case 0x6:
+      is_v6_mmu = 0;
+      break;
+    case 0x7:
+    case 0xf:
+      is_v6_mmu = 1;
+      break;
+    default:
+      grub_fatal ("Unsupported ARM ID 0x%x", main_id);
+    }
+
+  /* Read Cache Type Register */
+  cache_type = grub_arm_cache_type ();
+
+  switch (cache_type >> 24)
+    {
+    case 0x00:
+    case 0x01:
+      grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
+      grub_arch_cache_ilinesz = 8 << (cache_type & 3);
+      type = ARCH_ARMV5_WRITE_THROUGH;
+      break;
+    case 0x04:
+    case 0x0a:
+    case 0x0c:
+    case 0x0e:
+    case 0x1c:
+      grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
+      grub_arch_cache_ilinesz = 8 << (cache_type & 3);
+      type = ARCH_ARMV6_UNIFIED;
+      break;
+    case 0x05:
+    case 0x0b:
+    case 0x0d:
+    case 0x0f:
+    case 0x1d:
+      grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
+      grub_arch_cache_ilinesz = 8 << (cache_type & 3);
+      type = ARCH_ARMV6;
+      break;
+    default:
+      /*
+       * The CTR register is pretty much unchanged from v7 onwards,
+       * and is guaranteed to be backward compatible (the IDC/DIC bits
+       * allow certain CMOs to be elided, but performing them is never
+       * wrong), hence handling it like its AArch64 equivalent.
+       */
+      grub_arch_cache_dlinesz = 4 << ((cache_type >> 16) & 0xf);
+      grub_arch_cache_ilinesz = 4 << (cache_type & 0xf);
+      type = ARCH_ARMV7;
+    }
+  if (grub_arch_cache_dlinesz > grub_arch_cache_ilinesz)
+    grub_arch_cache_max_linesz = grub_arch_cache_dlinesz;
+  else
+    grub_arch_cache_max_linesz = grub_arch_cache_ilinesz;
+}
+
+#ifdef GRUB_MACHINE_UBOOT
+
+static void subdivide (grub_uint32_t *table, grub_uint32_t *subtable,
+		       grub_uint32_t addr)
+{
+  grub_uint32_t j;
+  addr = addr >> 20 << 20;
+  table[addr >> 20] = (grub_addr_t) subtable | 1;
+  for (j = 0; j < 256; j++)
+    subtable[j] = addr | (j << 12)
+      | (3 << 4) | (3 << 6) | (3 << 8) | (3 << 10)
+      | (0 << 3) | (1 << 2) | 2;
+}
+
+void
+grub_arm_enable_caches_mmu (void)
+{
+  grub_uint32_t *table;
+  grub_uint32_t i;
+  grub_uint32_t border_crossing = 0;
+  grub_uint32_t *subtable;
+  struct sys_info *si = grub_uboot_get_sys_info ();
+
+  if (!si || (si->mr_no == 0))
+    {
+      grub_printf ("couldn't get memory map, not enabling caches");
+      grub_errno = GRUB_ERR_NONE;
+      return;
+    }
+
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+
+  for (i = 0; (signed) i < si->mr_no; i++)
+    {
+      if (si->mr[i].start & ((1 << 20) - 1))
+	border_crossing++;
+      if ((si->mr[i].start + si->mr[i].size) & ((1 << 20) - 1))
+	border_crossing++;
+    }
+
+  grub_printf ("%d crossers\n", border_crossing);
+
+  table = grub_memalign (1 << 14, (1 << 14) + (border_crossing << 10));
+  if (!table)
+    {
+      grub_printf ("couldn't allocate place for MMU table, not enabling caches");
+      grub_errno = GRUB_ERR_NONE;
+      return;
+    }
+
+  subtable = table + (1 << 12);
+  /* Map all unknown as device.  */
+  for (i = 0; i < (1 << 12); i++)
+    table[i] = (i << 20) | (3 << 10) | (0 << 3) | (1 << 2) | 2;
+  /*
+    Device: TEX= 0, C=0, B=1
+    normal: TEX= 0, C=1, B=1
+    AP = 3
+    IMP = 0
+    Domain = 0
+*/
+
+  for (i = 0; (signed) i < si->mr_no; i++)
+    {
+      if (si->mr[i].start & ((1 << 20) - 1))
+	{
+	  subdivide (table, subtable, si->mr[i].start);
+	  subtable += (1 << 8);
+	}
+      if ((si->mr[i].start + si->mr[i].size) & ((1 << 20) - 1))
+	{
+	  subdivide (table, subtable, si->mr[i].start + si->mr[i].size);
+	  subtable += (1 << 8);
+	}
+    }
+
+  for (i = 0; (signed) i < si->mr_no; i++)
+    if ((si->mr[i].flags & MR_ATTR_MASK) == MR_ATTR_DRAM
+	|| (si->mr[i].flags & MR_ATTR_MASK) == MR_ATTR_SRAM
+	|| (si->mr[i].flags & MR_ATTR_MASK) == MR_ATTR_FLASH)
+      {
+	grub_uint32_t cur, end;
+	cur = si->mr[i].start;
+	end = si->mr[i].start + si->mr[i].size;
+	while (cur < end)
+	  {
+	    grub_uint32_t *st;
+	    if ((table[cur >> 20] & 3) == 2)
+	      {
+		cur = cur >> 20 << 20;
+		table[cur >> 20] = cur | (3 << 10) | (1 << 3) | (1 << 2) | 2;
+		cur += (1 << 20);
+		continue;
+	      }
+	    cur = cur >> 12 << 12;
+	    st = (grub_uint32_t *) (table[cur >> 20] & ~0x3ff);
+	    st[(cur >> 12) & 0xff] = cur | (3 << 4) | (3 << 6)
+	      | (3 << 8) | (3 << 10)
+	      | (1 << 3) | (1 << 2) | 2;
+	    cur += (1 << 12);
+	  }
+      }
+
+  grub_printf ("MMU tables generated\n");
+  if (is_v6_mmu)
+    grub_arm_clear_mmu_v6 ();
+
+  grub_printf ("enabling MMU\n");
+  grub_arm_enable_mmu (table);
+  grub_printf ("MMU enabled\n");
+}
+
+#endif
+
+void
+grub_arch_sync_caches (void *address, grub_size_t len)
+{
+  grub_addr_t start = (grub_addr_t) address;
+  grub_addr_t end = start + len;
+
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+  start = ALIGN_DOWN (start, grub_arch_cache_max_linesz);
+  end = ALIGN_UP (end, grub_arch_cache_max_linesz);
+  switch (type)
+    {
+    case ARCH_ARMV6:
+      grub_arm_clean_dcache_range_armv6 (start, end, grub_arch_cache_dlinesz);
+      grub_arm_invalidate_icache_range_armv6 (start, end,
+					      grub_arch_cache_ilinesz);
+      break;
+    case ARCH_ARMV7:
+      grub_arm_clean_dcache_range_armv7 (start, end, grub_arch_cache_dlinesz);
+      grub_arm_invalidate_icache_range_armv7 (start, end,
+					      grub_arch_cache_ilinesz);
+      break;
+      /* Nothing to do.  */
+    case ARCH_ARMV5_WRITE_THROUGH:
+    case ARCH_ARMV6_UNIFIED:
+      break;
+      /* Pacify GCC.  */
+    case ARCH_UNKNOWN:
+      break;
+    }
+}
+
+void
+grub_arch_sync_dma_caches (volatile void *address, grub_size_t len)
+{
+  grub_addr_t start = (grub_addr_t) address;
+  grub_addr_t end = start + len;
+
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+  start = ALIGN_DOWN (start, grub_arch_cache_max_linesz);
+  end = ALIGN_UP (end, grub_arch_cache_max_linesz);
+  switch (type)
+    {
+    case ARCH_ARMV6:
+      grub_arm_clean_dcache_range_armv6 (start, end, grub_arch_cache_dlinesz);
+      grub_arm_invalidate_icache_range_armv6 (start, end,
+					      grub_arch_cache_ilinesz);
+      break;
+    case ARCH_ARMV5_WRITE_THROUGH:
+    case ARCH_ARMV6_UNIFIED:
+      grub_arm_clean_dcache_range_armv6 (start, end, grub_arch_cache_dlinesz);
+      break;
+    case ARCH_ARMV7:
+      grub_arm_clean_dcache_range_poc_armv7 (start, end, grub_arch_cache_dlinesz);
+      grub_arm_invalidate_icache_range_armv7 (start, end,
+					      grub_arch_cache_ilinesz);
+      break;
+      /* Pacify GCC.  */
+    case ARCH_UNKNOWN:
+      break;
+    }
+}
+
+void
+grub_arm_disable_caches_mmu (void)
+{
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+  switch (type)
+    {
+    case ARCH_ARMV5_WRITE_THROUGH:
+    case ARCH_ARMV6_UNIFIED:
+    case ARCH_ARMV6:
+      grub_arm_disable_caches_mmu_armv6 ();
+      break;
+    case ARCH_ARMV7:
+      grub_arm_disable_caches_mmu_armv7 ();
+      break;
+      /* Pacify GCC.  */
+    case ARCH_UNKNOWN:
+      break;
+    }
+}
diff --git a/grub-core/kern/arm/cache_armv6.S b/grub-core/kern/arm/cache_armv6.S
new file mode 100644
index 0000000..dfaded0
--- /dev/null
+++ b/grub-core/kern/arm/cache_armv6.S
@@ -0,0 +1,72 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache_armv6.S"
+	.text
+	.syntax	unified
+	.arm
+
+# define DMB	mcr	p15, 0, r0, c7, c10, 5
+# define DSB	mcr	p15, 0, r0, c7, c10, 4
+# define ISB	mcr	p15, 0, r0, c7, c5, 4
+#define ARMV6 1
+
+clean_invalidate_dcache:
+	mcr	p15, 0, r0, c7, c14, 0	@ Clean/Invalidate D-cache
+	bx	lr
+
+#include "cache.S"
+
+FUNCTION(grub_arm_main_id)
+	mrc 	p15, 0, r0, c0, c0, 0
+	bx lr
+
+FUNCTION(grub_arm_cache_type)
+	mrc 	p15, 0, r0, c0, c0, 1
+	bx lr
+
+FUNCTION(grub_arm_clear_mmu_v6)
+	mov	r0, #0
+	mcr	p15, 0, r0, c2, c0, 2
+	bx	lr
+
+FUNCTION(grub_arm_enable_mmu)
+	mcr	p15, 0, r0, c2, c0, 0
+
+	mvn	r0, #0
+	mcr	p15, 0, r0, c3, c0, 0
+
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 23)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mrc	p15, 0, r0, c1, c0, 0
+	orr	r0, r0, #(1 << 0)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mrc	p15, 0, r0, c1, c0, 0
+	orr	r0, r0, #(1 << 2)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mrc	p15, 0, r0, c1, c0, 0
+	orr	r0, r0, #(1 << 12)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	bx	lr
diff --git a/grub-core/kern/arm/cache_armv7.S b/grub-core/kern/arm/cache_armv7.S
new file mode 100644
index 0000000..5ae76a3
--- /dev/null
+++ b/grub-core/kern/arm/cache_armv7.S
@@ -0,0 +1,138 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache_armv7.S"
+	.text
+	.syntax	unified
+#if !defined (__thumb2__)
+	.arch	armv7a
+	.arm
+#else
+	.arch	armv7
+	.thumb
+#endif
+# define DMB	dmb
+# define DSB	dsb
+# define ISB	isb
+#define ARMV7 1
+
+FUNCTION(grub_arm_clean_dcache_range_poc_armv7)
+	DSB
+	@ Clean data cache for range to point-of-coherence
+1:	cmp	r0, r1
+	bge	2f
+	mcr	p15, 0, r0, c7, c14, 1	@ DCCMVAC
+	add	r0, r0, r2		@ Next line
+	b	1b
+2:	DSB
+	bx	lr
+
+
+	@ r0  - CLIDR
+	@ r1  - LoC
+	@ r2  - current level
+	@ r3  - num sets
+	@ r4  - num ways
+	@ r5  - current set
+	@ r6  - current way
+	@ r7  - line size
+	@ r8  - scratch
+	@ r9  - scratch
+	@ r10 - scratch
+	@ r11 - scratch
+clean_invalidate_dcache:
+	push	{r4-r12, lr}
+	mrc 	p15, 1, r0, c0, c0, 1	@ Read CLIDR
+	lsr	r1, r0, #24		@ Extract LoC
+	and	r1, r1, #0x7
+
+	mov	r2, #0			@ First level, L1
+2:	and	r8, r0, #7		@ cache type at current level
+	cmp	r8, #2
+	blt	5f			@ instruction only, or none, skip level
+
+	@ set current cache level/type (for CCSIDR read)
+	lsl	r8, r2, #1
+	mcr	p15, 2, r8, c0, c0, 0	@ Write CSSELR (level, type: data/uni)
+
+	@ read current cache information
+	mrc	p15, 1, r8, c0, c0, 0	@ Read CCSIDR
+	lsr	r3, r8, #13		@ Number of sets -1
+
+	@ Keep only 14 bits of r3
+	lsl     r3, r3, #18
+	lsr     r3, r3, #18
+
+	lsr	r4, r8, #3		@ Number of ways -1
+
+	@ Keep only 9  bits of r4
+	lsl     r4, r4, #23
+	lsr     r4, r4, #23
+
+	and	r7, r8, #7		@ log2(line size in words) - 2
+	add	r7, r7, #2		@  adjust
+	mov	r8, #1
+	lsl	r7, r8, r7		@  -> line size in words
+	lsl	r7, r7, #2		@  -> bytes
+
+	@ set loop
+	mov	r5, #0			@ current set = 0
+3:	lsl	r8, r2, #1		@ insert level
+	clz	r9, r7			@ calculate set field offset
+	mov	r10, #31
+	sub	r9, r10, r9
+	lsl	r10, r5, r9
+	orr	r8, r8, r10		@ insert set field
+
+	@ way loop
+	@ calculate way field offset
+	mov	r6, #0			@ current way = 0
+	add	r10, r4, #1
+	clz	r9, r10			@ r9 = way field offset
+	add	r9, r9, #1
+4:	lsl	r10, r6, r9
+	orr	r11, r8, r10		@ insert way field
+
+	@ clean and invalidate line by set/way
+	mcr	p15, 0, r11, c7, c14, 2	@ DCCISW
+
+	@ next way
+	add	r6, r6, #1
+	cmp	r6, r4
+	ble	4b
+
+	@ next set
+	add	r5, r5, #1
+	cmp	r5, r3
+	ble	3b
+
+	@ next level
+5:	lsr	r0, r0, #3		@ align next level CLIDR 'type' field
+	add	r2, r2, #1		@ increment cache level counter
+	cmp	r2, r1
+	blt	2b			@ outer loop
+
+	@ return
+6:	DSB
+	ISB
+	pop	{r4-r12, lr}
+	bx	lr
+
+#include "cache.S"
\ No newline at end of file
diff --git a/grub-core/kern/arm/compiler-rt.S b/grub-core/kern/arm/compiler-rt.S
new file mode 100644
index 0000000..645b42f
--- /dev/null
+++ b/grub-core/kern/arm/compiler-rt.S
@@ -0,0 +1,86 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+#include <grub/dl.h>
+
+	.file	"misc.S"
+	.text
+	.syntax	unified
+#if !defined (__thumb2__)
+	.arm
+#else
+	.thumb
+#endif
+
+	.align	2
+
+FUNCTION(__muldi3)
+FUNCTION(__aeabi_lmul)
+        stmfd   sp!, {r4, fp}
+        add     fp, sp, #4
+        sub     sp, sp, #16
+        str     r0, [fp, #-12]
+        str     r1, [fp, #-8]
+        str     r2, [fp, #-20]
+        str     r3, [fp, #-16]
+        ldr     r3, [fp, #-8]
+        ldr     r2, [fp, #-20]
+        mul     r2, r3, r2
+        ldr     r3, [fp, #-16]
+        ldr     r1, [fp, #-12]
+        mul     r3, r1, r3
+        add     r2, r2, r3
+        ldr     r0, [fp, #-12]
+        ldr     r1, [fp, #-20]
+        umull   r3, r4, r0, r1
+        add     r2, r2, r4
+        mov     r4, r2
+        mov     r0, r3
+        mov     r1, r4
+	mov     sp, fp
+	sub     sp, sp, #4
+        ldmfd   sp!, {r4, fp}
+        bx      lr
+
+	.macro division32 parent
+
+        sub     sp, sp, #8      @ Allocate naturally aligned 64-bit space
+        stmfd   sp!, {r3,lr}    @ Dummy r3 to maintain stack alignment
+        add     r2, sp, #8      @ Set r2 to address of 64-bit space
+        bl      \parent
+        ldr     r1, [sp, #8]    @ Extract remainder
+        ldmfd   sp!, {r3,lr}    @ Pop into an unused arg/scratch register
+        add     sp, sp, #8
+        bx      lr
+	.endm
+
+FUNCTION(__aeabi_uidivmod)
+	division32 grub_divmod32
+FUNCTION(__aeabi_idivmod)
+	division32 grub_divmod32s
+
+/*
+ * Null divide-by-zero handler
+ */
+FUNCTION(__aeabi_unwind_cpp_pr0)
+FUNCTION(raise)
+	mov	r0, #0
+	bx	lr
+	
+	END
diff --git a/grub-core/kern/arm/coreboot/cbtable.c b/grub-core/kern/arm/coreboot/cbtable.c
new file mode 100644
index 0000000..8a655bb
--- /dev/null
+++ b/grub-core/kern/arm/coreboot/cbtable.c
@@ -0,0 +1,40 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007,2008,2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/coreboot/lbio.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+#include <grub/arm/startup.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#pragma GCC diagnostic ignored "-Wcast-align"
+
+grub_linuxbios_table_header_t
+grub_linuxbios_get_tables (void)
+{
+  grub_linuxbios_table_header_t table_header
+    = (grub_linuxbios_table_header_t) grub_arm_saved_registers.r[0];
+
+  if (!grub_linuxbios_check_signature (table_header))
+    return 0;
+
+  return table_header;
+}
diff --git a/grub-core/kern/arm/coreboot/coreboot.S b/grub-core/kern/arm/coreboot/coreboot.S
new file mode 100644
index 0000000..a110452
--- /dev/null
+++ b/grub-core/kern/arm/coreboot/coreboot.S
@@ -0,0 +1,44 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2016  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"coreboot.S"
+	.text
+	.syntax	unified
+#if !defined (__thumb2__)
+	.arch	armv7a
+	.arm
+#else
+	.arch	armv7
+	.thumb
+#endif
+
+FUNCTION(grub_arm_pfr1)
+	mrc p15, 0, r0, c0, c1, 1
+	bx	lr
+
+FUNCTION(grub_armv7_get_timer_value)
+	isb
+	mrrc p15, 1, r0, r1, c14
+	bx	lr
+
+FUNCTION(grub_armv7_get_timer_frequency)
+	mrc p15, 0, r0, c14, c0, 0
+	bx	lr
+
diff --git a/grub-core/kern/arm/coreboot/dma.c b/grub-core/kern/arm/coreboot/dma.c
new file mode 100644
index 0000000..2c2a627
--- /dev/null
+++ b/grub-core/kern/arm/coreboot/dma.c
@@ -0,0 +1,59 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/dma.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/mm_private.h>
+#include <grub/cache.h>
+
+struct grub_pci_dma_chunk *
+grub_memalign_dma32 (grub_size_t align, grub_size_t size)
+{
+  void *ret;
+  if (align < 64)
+    align = 64;
+  size = ALIGN_UP (size, align);
+  ret = grub_memalign (align, size);
+  if (!ret)
+    return 0;
+  grub_arch_sync_dma_caches (ret, size);
+  return ret;
+}
+
+void
+grub_dma_free (struct grub_pci_dma_chunk *ch)
+{
+  grub_size_t size = (((struct grub_mm_header *) ch) - 1)->size * GRUB_MM_ALIGN;
+  grub_arch_sync_dma_caches (ch, size);
+  grub_free (ch);
+}
+
+volatile void *
+grub_dma_get_virt (struct grub_pci_dma_chunk *ch)
+{
+  return (void *) ch;
+}
+
+grub_uint32_t
+grub_dma_get_phys (struct grub_pci_dma_chunk *ch)
+{
+  return (grub_uint32_t) (grub_addr_t) ch;
+}
+
diff --git a/grub-core/kern/arm/coreboot/init.c b/grub-core/kern/arm/coreboot/init.c
new file mode 100644
index 0000000..8d8c5b8
--- /dev/null
+++ b/grub-core/kern/arm/coreboot/init.c
@@ -0,0 +1,151 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/kernel.h>
+#include <grub/mm.h>
+#include <grub/memory.h>
+#include <grub/machine/console.h>
+#include <grub/machine/kernel.h>
+#include <grub/offsets.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/loader.h>
+#include <grub/env.h>
+#include <grub/cache.h>
+#include <grub/time.h>
+#include <grub/symbol.h>
+#include <grub/video.h>
+#include <grub/coreboot/lbio.h>
+#include <grub/fdtbus.h>
+
+extern grub_uint8_t _start[];
+extern grub_uint8_t _end[];
+extern grub_uint8_t _edata[];
+grub_addr_t start_of_ram = ~(grub_addr_t)0;
+
+void  __attribute__ ((noreturn))
+grub_exit (void)
+{
+  /* We can't use grub_fatal() in this function.  This would create an infinite
+     loop, since grub_fatal() calls grub_abort() which in turn calls grub_exit().  */
+  while (1)
+    grub_cpu_idle ();
+}
+
+static grub_uint64_t modend;
+static int have_memory = 0;
+
+/* Helper for grub_machine_init.  */
+static int
+heap_init (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
+	   void *data __attribute__ ((unused)))
+{
+  grub_uint64_t begin = addr, end = addr + size;
+
+#if GRUB_CPU_SIZEOF_VOID_P == 4
+  /* Restrict ourselves to 32-bit memory space.  */
+  if (begin > GRUB_ULONG_MAX)
+    return 0;
+  if (end > GRUB_ULONG_MAX)
+    end = GRUB_ULONG_MAX;
+#endif
+
+  if (start_of_ram > begin)
+    start_of_ram = begin;
+
+  if (type != GRUB_MEMORY_AVAILABLE)
+    return 0;
+
+  if (modend && begin < modend)
+    {
+      if (begin < (grub_addr_t)_start)
+	{
+	  grub_mm_init_region ((void *) (grub_addr_t) begin, (grub_size_t) ((grub_addr_t)_start - begin));
+	  have_memory = 1;
+	}
+      begin = modend;
+    }
+
+  /* Avoid DMA problems.  */
+  if (end >= 0xfe000000)
+    end = 0xfe000000;
+
+  if (end <= begin)
+    return 0;
+
+  grub_mm_init_region ((void *) (grub_addr_t) begin, (grub_size_t) (end - begin));
+
+  have_memory = 1;
+
+  return 0;
+}
+
+void
+grub_machine_init (void)
+{
+  struct grub_module_header *header;
+  void *dtb = 0;
+  grub_size_t dtb_size = 0;
+
+  modend = grub_modules_get_end ();
+
+  grub_video_coreboot_fb_early_init ();
+
+  grub_machine_mmap_iterate (heap_init, NULL);
+  if (!have_memory)
+    grub_fatal ("No memory found");
+
+  grub_video_coreboot_fb_late_init ();
+
+  grub_font_init ();
+  grub_gfxterm_init ();
+
+  FOR_MODULES (header)
+    if (header->type == OBJ_TYPE_DTB)
+      {
+	char *dtb_orig_addr, *dtb_copy;
+	dtb_orig_addr = (char *) header + sizeof (struct grub_module_header);
+
+	dtb_size = header->size - sizeof (struct grub_module_header);
+	dtb = dtb_copy = grub_malloc (dtb_size);
+	grub_memmove (dtb_copy, dtb_orig_addr, dtb_size);
+	break;
+      }
+  if (!dtb)
+    grub_fatal ("No DTB found");
+  grub_fdtbus_init (dtb, dtb_size);
+
+  grub_rk3288_spi_init ();
+
+  grub_machine_timer_init ();
+  grub_cros_init ();
+  grub_pl050_init ();
+}
+
+void
+grub_machine_get_bootlocation (char **device __attribute__ ((unused)),
+			       char **path __attribute__ ((unused)))
+{
+}
+
+void
+grub_machine_fini (int flags __attribute__ ((unused)))
+{
+}
diff --git a/grub-core/kern/arm/coreboot/timer.c b/grub-core/kern/arm/coreboot/timer.c
new file mode 100644
index 0000000..d97b844
--- /dev/null
+++ b/grub-core/kern/arm/coreboot/timer.c
@@ -0,0 +1,101 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2016  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/mm.h>
+#include <grub/machine/kernel.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/time.h>
+#include <grub/fdtbus.h>
+#include <grub/misc.h>
+
+grub_uint64_t
+grub_armv7_get_timer_value(void);
+
+grub_uint32_t
+grub_armv7_get_timer_frequency(void);
+
+grub_uint32_t
+grub_arm_pfr1(void);
+
+static int have_timer = 0;
+static volatile grub_uint32_t *sp804_regs;
+
+static grub_uint64_t
+sp804_get_time_ms (void)
+{
+  static grub_uint32_t high, last_low;
+  grub_uint32_t low = ~sp804_regs[1];
+  if (last_low > low)
+    high++;
+  last_low = low;
+  return grub_divmod64 ((((grub_uint64_t) high) << 32) | low,
+			1000, 0);
+}
+
+static grub_err_t
+sp804_attach(const struct grub_fdtbus_dev *dev)
+{
+  if (have_timer)
+    return GRUB_ERR_NONE;
+  sp804_regs = grub_fdtbus_map_reg (dev, 0, 0);
+  if (!grub_fdtbus_is_mapping_valid (sp804_regs))
+    return grub_error (GRUB_ERR_IO, "could not map sp804: %p", sp804_regs);
+  grub_install_get_time_ms (sp804_get_time_ms);
+  have_timer = 1;
+  return GRUB_ERR_NONE;
+}
+
+struct grub_fdtbus_driver sp804 =
+{
+  .compatible = "arm,sp804",
+  .attach = sp804_attach
+};
+
+static grub_uint32_t timer_frequency_in_khz;
+
+static grub_uint64_t
+generic_get_time_ms (void)
+{
+  return grub_divmod64 (grub_armv7_get_timer_value(), timer_frequency_in_khz, 0);
+}
+
+static int
+try_generic_timer (void)
+{
+  if (((grub_arm_pfr1 () >> 16) & 0xf) != 1)
+    return 0;
+  grub_printf ("freq = %x\n", grub_armv7_get_timer_frequency());
+  timer_frequency_in_khz = 0x016e3600 / 1000; //grub_armv7_get_timer_frequency() / 1000;
+  if (timer_frequency_in_khz == 0)
+    return 0;
+  grub_install_get_time_ms (generic_get_time_ms);
+  have_timer = 1;
+  return 1;
+}
+
+void
+grub_machine_timer_init (void)
+{
+  grub_fdtbus_register (&sp804);
+
+  if (!have_timer)
+    try_generic_timer ();
+  if (!have_timer)
+    grub_fatal ("No timer found");
+}
diff --git a/grub-core/kern/arm/dl.c b/grub-core/kern/arm/dl.c
new file mode 100644
index 0000000..eab9d17
--- /dev/null
+++ b/grub-core/kern/arm/dl.c
@@ -0,0 +1,280 @@
+/* dl.c - arch-dependent part of loadable module support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/i18n.h>
+#include <grub/arm/reloc.h>
+
+struct trampoline_arm
+{
+#define ARM_LOAD_IP 0xe59fc000
+#define ARM_BX 0xe12fff1c
+#define ARM_MOV_PC 0xe1a0f00c
+  grub_uint32_t load_ip;  /* ldr ip, [pc] */
+  grub_uint32_t bx; /* bx ip or mov pc, ip*/
+  grub_uint32_t addr;
+};
+
+static grub_uint16_t thumb_template[8] =
+  {
+    0x468c, /* mov	ip, r1 */
+    0x4903, /* ldr	r1, [pc, #12]	; (10 <.text+0x10>) */
+    /* Exchange R1 and IP in limited Thumb instruction set.
+       IP gets negated but we compensate it by C code.  */
+                                     /* R1   IP */
+                                     /* -A   R1 */
+    0x4461, /* add	r1, ip */    /* R1-A R1 */
+    0x4249, /* negs	r1, r1 */    /* A-R1 R1 */
+    0x448c, /* add	ip, r1 */    /* A-R1 A  */
+    0x4249, /* negs	r1, r1 */    /* R1-A A  */
+    0x4461, /* add	r1, ip */    /* R1   A  */
+    0x4760  /* bx	ip */
+  };
+
+struct trampoline_thumb
+{
+  grub_uint16_t template[8];
+  grub_uint32_t neg_addr;
+};
+
+#pragma GCC diagnostic ignored "-Wcast-align"
+
+grub_err_t
+grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp,
+				 grub_size_t *got)
+{
+  const Elf_Ehdr *e = ehdr;
+  const Elf_Shdr *s;
+  unsigned i;
+
+  *tramp = 0;
+  *got = 0;
+
+  for (i = 0, s = (const Elf_Shdr *) ((grub_addr_t) e + e->e_shoff);
+       i < e->e_shnum;
+       i++, s = (const Elf_Shdr *) ((grub_addr_t) s + e->e_shentsize))
+    if (s->sh_type == SHT_REL)
+      {
+	const Elf_Rel *rel, *max;
+
+	for (rel = (const Elf_Rel *) ((grub_addr_t) e + s->sh_offset),
+	       max = (const Elf_Rel *) ((grub_addr_t) rel + s->sh_size);
+	     rel + 1 <= max;
+	     rel = (const Elf_Rel *) ((grub_addr_t) rel + s->sh_entsize))
+	  switch (ELF_R_TYPE (rel->r_info))
+	    {
+	    case R_ARM_CALL:
+	    case R_ARM_JUMP24:
+	      {
+		*tramp += sizeof (struct trampoline_arm);
+		break;
+	      }
+	    case R_ARM_THM_CALL:
+	    case R_ARM_THM_JUMP24:
+	    case R_ARM_THM_JUMP19:
+	      {
+		*tramp += sizeof (struct trampoline_thumb);
+		break;
+	      }
+	    }
+      }
+
+  grub_dprintf ("dl", "trampoline size %x\n", *tramp);
+
+  return GRUB_ERR_NONE;
+}
+
+/*************************************************
+ * Runtime dynamic linker with helper functions. *
+ *************************************************/
+grub_err_t
+grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
+			       Elf_Shdr *s, grub_dl_segment_t seg)
+{
+  Elf_Rel *rel, *max;
+
+  for (rel = (Elf_Rel *) ((char *) ehdr + s->sh_offset),
+	 max = (Elf_Rel *) ((char *) rel + s->sh_size);
+       rel < max;
+       rel = (Elf_Rel *) ((char *) rel + s->sh_entsize))
+    {
+      Elf_Addr *target, sym_addr;
+      grub_err_t retval;
+      Elf_Sym *sym;
+
+      if (seg->size < rel->r_offset)
+	return grub_error (GRUB_ERR_BAD_MODULE,
+			   "reloc offset is out of the segment");
+      target = (void *) ((char *) seg->addr + rel->r_offset);
+      sym = (Elf_Sym *) ((char *) mod->symtab
+			 + mod->symsize * ELF_R_SYM (rel->r_info));
+
+      sym_addr = sym->st_value;
+
+      switch (ELF_R_TYPE (rel->r_info))
+	{
+	case R_ARM_ABS32:
+	  {
+	    /* Data will be naturally aligned */
+	    retval = grub_arm_reloc_abs32 (target, sym_addr);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	case R_ARM_CALL:
+	case R_ARM_JUMP24:
+	  {
+	    grub_int32_t offset;
+
+	    sym_addr += grub_arm_jump24_get_offset (target);
+	    offset = sym_addr - (grub_uint32_t) target;
+
+	    if ((sym_addr & 1) || !grub_arm_jump24_check_offset (offset))
+	      {
+		struct trampoline_arm *tp = mod->trampptr;
+		mod->trampptr = tp + 1;
+		tp->load_ip = ARM_LOAD_IP;
+		tp->bx = (sym_addr & 1) ? ARM_BX : ARM_MOV_PC;
+		tp->addr = sym_addr + 8;
+		offset = (grub_uint8_t *) tp - (grub_uint8_t *) target - 8;
+	      }
+	    if (!grub_arm_jump24_check_offset (offset))
+	      return grub_error (GRUB_ERR_BAD_MODULE,
+				 "trampoline out of range");
+	    grub_arm_jump24_set_offset (target, offset);
+	  }
+	  break;
+	case R_ARM_THM_CALL:
+	case R_ARM_THM_JUMP24:
+	  {
+	    /* Thumb instructions can be 16-bit aligned */
+	    grub_int32_t offset;
+
+	    sym_addr += grub_arm_thm_call_get_offset ((grub_uint16_t *) target);
+
+	    grub_dprintf ("dl", "    sym_addr = 0x%08x\n", sym_addr);
+	    if (ELF_ST_TYPE (sym->st_info) != STT_FUNC)
+	      sym_addr |= 1;
+
+	    offset = sym_addr - (grub_uint32_t) target;
+
+	    grub_dprintf("dl", " BL*: target=%p, sym_addr=0x%08x, offset=%d\n",
+			 target, sym_addr, offset);
+
+	    if (!(sym_addr & 1) || (offset < -0x200000 || offset >= 0x200000))
+	      {
+		struct trampoline_thumb *tp = mod->trampptr;
+		mod->trampptr = tp + 1;
+		grub_memcpy (tp->template, thumb_template, sizeof (tp->template));
+		tp->neg_addr = -sym_addr - 4;
+		offset = ((grub_uint8_t *) tp - (grub_uint8_t *) target - 4) | 1;
+	      }
+
+	    if (offset < -0x200000 || offset >= 0x200000)
+	      return grub_error (GRUB_ERR_BAD_MODULE,
+				 "trampoline out of range");
+
+	    grub_dprintf ("dl", "    relative destination = %p\n",
+			  (char *) target + offset);
+
+	    retval = grub_arm_thm_call_set_offset ((grub_uint16_t *) target, offset);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	  /* Happens when compiled with -march=armv4.  Since currently we need
+	     at least armv5, keep bx as-is.
+	   */
+	case R_ARM_V4BX:
+	  break;
+	case R_ARM_THM_MOVW_ABS_NC:
+	case R_ARM_THM_MOVT_ABS:
+	  {
+	    grub_uint32_t offset;
+	    offset = grub_arm_thm_movw_movt_get_value((grub_uint16_t *) target);
+	    offset += sym_addr;
+
+	    if (ELF_R_TYPE (rel->r_info) == R_ARM_THM_MOVT_ABS)
+	      offset >>= 16;
+	    else
+	      offset &= 0xffff;
+
+	    grub_arm_thm_movw_movt_set_value((grub_uint16_t *) target, offset);
+	  }
+	  break;
+	case R_ARM_THM_JUMP19:
+	  {
+	    /* Thumb instructions can be 16-bit aligned */
+	    grub_int32_t offset;
+
+	    sym_addr += grub_arm_thm_jump19_get_offset ((grub_uint16_t *) target);
+
+	    if (ELF_ST_TYPE (sym->st_info) != STT_FUNC)
+	      sym_addr |= 1;
+
+	    offset = sym_addr - (grub_uint32_t) target;
+
+	    if (!grub_arm_thm_jump19_check_offset (offset)
+		|| !(sym_addr & 1))
+	      {
+		struct trampoline_thumb *tp = mod->trampptr;
+		mod->trampptr = tp + 1;
+		grub_memcpy (tp->template, thumb_template, sizeof (tp->template));
+		tp->neg_addr = -sym_addr - 4;
+		offset = ((grub_uint8_t *) tp - (grub_uint8_t *) target - 4) | 1;
+	      }
+
+	    if (!grub_arm_thm_jump19_check_offset (offset))
+	      return grub_error (GRUB_ERR_BAD_MODULE,
+				 "trampoline out of range");
+
+	    grub_arm_thm_jump19_set_offset ((grub_uint16_t *) target, offset);
+	  }
+	  break;
+	default:
+	  return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+			     N_("relocation 0x%x is not implemented yet"),
+			     ELF_R_TYPE (rel->r_info));
+	}
+    }
+
+  return GRUB_ERR_NONE;
+}
+
+
+/*
+ * Check if EHDR is a valid ELF header.
+ */
+grub_err_t
+grub_arch_dl_check_header (void *ehdr)
+{
+  Elf_Ehdr *e = ehdr;
+
+  /* Check the magic numbers.  */
+  if (e->e_ident[EI_CLASS] != ELFCLASS32
+      || e->e_ident[EI_DATA] != ELFDATA2LSB || e->e_machine != EM_ARM)
+    return grub_error (GRUB_ERR_BAD_OS,
+		       N_("invalid arch-dependent ELF magic"));
+
+  return GRUB_ERR_NONE;
+}
diff --git a/grub-core/kern/arm/dl_helper.c b/grub-core/kern/arm/dl_helper.c
new file mode 100644
index 0000000..21d77f7
--- /dev/null
+++ b/grub-core/kern/arm/dl_helper.c
@@ -0,0 +1,245 @@
+/* dl.c - arch-dependent part of loadable module support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/i18n.h>
+#include <grub/arm/reloc.h>
+
+static inline grub_uint32_t
+thumb_get_instruction_word (grub_uint16_t *target)
+{
+  /* Extract instruction word in alignment-safe manner */
+  return grub_le_to_cpu16 ((*target)) << 16 | grub_le_to_cpu16 (*(target + 1));
+}
+
+static inline void
+thumb_set_instruction_word (grub_uint16_t *target, grub_uint32_t insword)
+{
+  *target = grub_cpu_to_le16 (insword >> 16);
+  *(target + 1) = grub_cpu_to_le16 (insword & 0xffff);
+}
+
+/*
+ * R_ARM_ABS32
+ *
+ * Simple relocation of 32-bit value (in literal pool)
+ */
+grub_err_t
+grub_arm_reloc_abs32 (Elf32_Word *target, Elf32_Addr sym_addr)
+{
+  Elf32_Addr tmp;
+
+  tmp = grub_le_to_cpu32 (*target);
+  tmp += sym_addr;
+  *target = grub_cpu_to_le32 (tmp);
+
+  return GRUB_ERR_NONE;
+}
+
+/********************************************************************
+ * Thumb (T32) relocations:                                         *
+ *                                                                  *
+ * 32-bit Thumb instructions can be 16-bit aligned, and are fetched *
+ * little-endian, requiring some additional fiddling.               *
+ ********************************************************************/
+
+grub_int32_t
+grub_arm_thm_call_get_offset (grub_uint16_t *target)
+{
+  grub_uint32_t sign, j1, j2;
+  grub_uint32_t insword;
+  grub_int32_t offset;
+
+  insword = thumb_get_instruction_word (target);
+
+  /* Extract bitfields from instruction words */
+  sign = (insword >> 26) & 1;
+  j1 = (insword >> 13) & 1;
+  j2 = (insword >> 11) & 1;
+  offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
+    ((~(j2 ^ sign) & 1) << 22) |
+    ((insword & 0x03ff0000) >> 4) | ((insword & 0x000007ff) << 1);
+
+  /* Sign adjust and calculate offset */
+  if (offset & (1 << 24))
+    offset -= (1 << 25);
+
+  return offset;
+}
+
+grub_err_t
+grub_arm_thm_call_set_offset (grub_uint16_t *target, grub_int32_t offset)
+{
+  grub_uint32_t sign, j1, j2;
+  const grub_uint32_t insmask = 0xf800d000;
+  grub_uint32_t insword;
+  int is_blx;
+
+  insword = thumb_get_instruction_word (target);
+
+  if (((insword >> 12) & 0xd) == 0xc)
+    is_blx = 1;
+  else
+    is_blx = 0;
+
+  if (!is_blx && !(offset & 1))
+    return grub_error (GRUB_ERR_BAD_MODULE, "bl/b.w targettting ARM");
+
+  /* Transform blx into bl if necessarry.  */
+  if (is_blx && (offset & 1))
+    insword |= (1 << 12);
+
+  /* Reassemble instruction word */
+  sign = (offset >> 24) & 1;
+  j1 = sign ^ (~(offset >> 23) & 1);
+  j2 = sign ^ (~(offset >> 22) & 1);
+  insword = (insword & insmask) |
+    (sign << 26) |
+    (((offset >> 12) & 0x03ff) << 16) |
+    (j1 << 13) | (j2 << 11) | ((offset >> 1) & 0x07ff);
+
+  thumb_set_instruction_word (target, insword);
+
+  grub_dprintf ("dl", "    *insword = 0x%08x", insword);
+
+  return GRUB_ERR_NONE;
+}
+
+grub_int32_t
+grub_arm_thm_jump19_get_offset (grub_uint16_t *target)
+{
+  grub_int32_t offset;
+  grub_uint32_t insword;
+
+  insword = thumb_get_instruction_word (target);
+
+  /* Extract and sign extend offset */
+  offset = ((insword >> 26) & 1) << 19
+    | ((insword >> 11) & 1) << 18
+    | ((insword >> 13) & 1) << 17
+    | ((insword >> 16) & 0x3f) << 11
+    | (insword & 0x7ff);
+  offset <<= 1;
+  if (offset & (1 << 20))
+    offset -= (1 << 21);
+
+  return offset;
+}
+
+void
+grub_arm_thm_jump19_set_offset (grub_uint16_t *target, grub_int32_t offset)
+{
+  grub_uint32_t insword;
+  const grub_uint32_t insmask = 0xfbc0d000;
+
+  offset >>= 1;
+  offset &= 0xfffff;
+
+  insword = thumb_get_instruction_word (target);
+
+  /* Reassemble instruction word and write back */
+  insword &= insmask;
+  insword |= ((offset >> 19) & 1) << 26
+    | ((offset >> 18) & 1) << 11
+    | ((offset >> 17) & 1) << 13
+    | ((offset >> 11) & 0x3f) << 16
+    | (offset & 0x7ff);
+  thumb_set_instruction_word (target, insword);
+}
+
+int
+grub_arm_thm_jump19_check_offset (grub_int32_t offset)
+{
+  if ((offset > 1048574) || (offset < -1048576))
+    return 0;
+  return 1;
+}
+
+grub_uint16_t
+grub_arm_thm_movw_movt_get_value (grub_uint16_t *target)
+{
+  grub_uint32_t insword;
+
+  insword = thumb_get_instruction_word (target);
+
+  return ((insword & 0xf0000) >> 4) | ((insword & 0x04000000) >> 15) | \
+    ((insword & 0x7000) >> 4) | (insword & 0xff);
+}
+
+void
+grub_arm_thm_movw_movt_set_value (grub_uint16_t *target, grub_uint16_t value)
+{
+  grub_uint32_t insword;
+  const grub_uint32_t insmask = 0xfbf08f00;
+
+  insword = thumb_get_instruction_word (target);
+  insword &= insmask;
+
+  insword |= ((value & 0xf000) << 4) | ((value & 0x0800) << 15) | \
+    ((value & 0x0700) << 4) | (value & 0xff);
+
+  thumb_set_instruction_word (target, insword);
+}
+
+
+/***********************************************************
+ * ARM (A32) relocations:                                  *
+ *                                                         *
+ * ARM instructions are 32-bit in size and 32-bit aligned. *
+ ***********************************************************/
+
+grub_int32_t
+grub_arm_jump24_get_offset (grub_uint32_t *target)
+{
+  grub_int32_t offset;
+  grub_uint32_t insword;
+
+  insword = grub_le_to_cpu32 (*target);
+
+  offset = (insword & 0x00ffffff) << 2;
+  if (offset & 0x02000000)
+    offset -= 0x04000000;
+  return offset;
+}
+
+int
+grub_arm_jump24_check_offset (grub_int32_t offset)
+{
+  if (offset >= 0x02000000 || offset < -0x02000000)
+    return 0;
+  return 1;
+}
+
+void
+grub_arm_jump24_set_offset (grub_uint32_t *target,
+			    grub_int32_t offset)
+{
+  grub_uint32_t insword;
+
+  insword = grub_le_to_cpu32 (*target);
+
+  insword &= 0xff000000;
+  insword |= (offset >> 2) & 0x00ffffff;
+
+  *target = grub_cpu_to_le32 (insword);
+}
diff --git a/grub-core/kern/arm/efi/init.c b/grub-core/kern/arm/efi/init.c
new file mode 100644
index 0000000..40c3b46
--- /dev/null
+++ b/grub-core/kern/arm/efi/init.c
@@ -0,0 +1,77 @@
+/* init.c - initialize an arm-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/efi/efi.h>
+#include <grub/loader.h>
+
+static grub_uint64_t tmr;
+static grub_efi_event_t tmr_evt;
+
+static grub_uint64_t
+grub_efi_get_time_ms (void)
+{
+  return tmr;
+}
+
+static void 
+increment_timer (grub_efi_event_t event __attribute__ ((unused)),
+		 void *context __attribute__ ((unused)))
+{
+  tmr += 10;
+}
+
+void
+grub_machine_init (void)
+{
+  grub_efi_boot_services_t *b;
+
+  grub_efi_init ();
+
+  b = grub_efi_system_table->boot_services;
+
+  efi_call_5 (b->create_event, GRUB_EFI_EVT_TIMER | GRUB_EFI_EVT_NOTIFY_SIGNAL,
+	      GRUB_EFI_TPL_CALLBACK, increment_timer, NULL, &tmr_evt);
+  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 100000);
+
+  grub_install_get_time_ms (grub_efi_get_time_ms);
+}
+
+void
+grub_machine_fini (int flags)
+{
+  grub_efi_boot_services_t *b;
+
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  b = grub_efi_system_table->boot_services;
+
+  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_CANCEL, 0);
+  efi_call_1 (b->close_event, tmr_evt);
+
+  grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
+}
diff --git a/grub-core/kern/arm/efi/startup.S b/grub-core/kern/arm/efi/startup.S
new file mode 100644
index 0000000..9f82653
--- /dev/null
+++ b/grub-core/kern/arm/efi/startup.S
@@ -0,0 +1,36 @@
+/*
+ * (C) Copyright 2013 Free Software Foundation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <grub/symbol.h>
+
+	.file 	"startup.S"
+	.text
+	.arm
+FUNCTION(_start)
+	/*
+	 *  EFI_SYSTEM_TABLE and EFI_HANDLE are passed in r1/r0.
+	 */
+	ldr	ip, =EXT_C(grub_efi_image_handle)
+	str	r0, [ip]
+	ldr	ip, =EXT_C(grub_efi_system_table)
+	str	r1, [ip]
+	ldr	ip, =EXT_C(grub_main)
+	bx	ip
+	END
diff --git a/grub-core/kern/arm/startup.S b/grub-core/kern/arm/startup.S
new file mode 100644
index 0000000..3946fe8
--- /dev/null
+++ b/grub-core/kern/arm/startup.S
@@ -0,0 +1,177 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/offsets.h>
+#include <grub/symbol.h>
+#include <grub/machine/kernel.h>
+
+/*
+ * GRUB is called from U-Boot as a Linux Kernel type image, which
+ * means among other things that it always enters in ARM state.
+ *
+ * coreboot starts in ARM mode as well.
+ *
+ * Overview of GRUB image layout:
+ *
+ * _start:
+ *              Entry point (1 ARM branch instruction, to "codestart")
+ * grub_total_module_size:
+ *              Data field: Size of included module blob
+ *              (when generated by grub-mkimage)
+ * codestart:
+ *              Remainder of statically-linked executable code and data.
+ * __bss_start:
+ *              Start of included module blob.
+ *              Also where global/static variables are located.
+ * _end:
+ *              End of bss region (but not necessarily module blob).
+ * <stack>:     
+ * <modules>:
+ *              Loadable modules, post relocation.
+ * <heap>:
+ */
+	
+	.text
+	.arm
+FUNCTION(_start)
+	b	codestart
+	
+	@ Size of final image integrated module blob - set by grub-mkimage
+	.org _start + GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE
+VARIABLE(grub_total_module_size)
+	.long 	0
+
+VARIABLE(grub_modbase)
+	.long 0
+bss_start_ptr:
+	.long   EXT_C(__bss_start)
+end_ptr:
+	.long   EXT_C(_end)
+
+	@ Memory map at start:
+	@ * text+data
+	@ * list relocations
+	@ * modules
+	@ Before we enter C, we need to apply the relocations
+	@ and get following map:
+	@ * text+data
+	@ * BSS (cleared)
+	@ * stack
+	@ * modules
+	@
+	@ To make things easier we ensure
+	@ that BSS+stack is larger than list of relocations
+	@ by increasing stack if necessarry.
+	@ This allows us to always unconditionally copy backwards
+	@ Currently list of relocations is ~5K and stack is set
+	@ to be at least 256K
+
+FUNCTION(codestart)
+	@ Store context: Machine ID, atags/dtb, ...
+	@ U-Boot API signature is stored on the U-Boot heap
+	@ Stack pointer used as start address for signature probing
+	mov	r12, sp
+	adr	sp, entry_state
+	push	{r0-r12,lr}	@ store U-Boot context (sp in r12)
+
+	adr     r1, _start
+	ldr	r0, bss_start_ptr		@ src
+	add     r0, r0, r1
+
+	add	r0, r0, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	mvn	r2, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	and	r0, r0, r2
+1:	
+        ldr     r3, [r0], #4  @load next offset
+	@ both -2 and -1 are treated the same as we have only one type of relocs
+	@ -2 means "end of this type of relocs" and -1 means "end of all relocs"
+        add     r2, r3, #2
+        cmp     r2, #1
+        bls     reloc_done
+	@ Adjust next offset
+        ldr     r2, [r3, r1]
+        add     r2, r2, r1
+        str     r2, [r3, r1]
+	b 1b
+
+reloc_done:
+
+	@ Modules have been stored as a blob
+	@ they need to be manually relocated to _end
+	add	r0, r0, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	mvn	r1, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	and	r0, r0, r1	@ src = aligned end of relocations
+
+	ldr	r1, end_ptr		@ dst = End of BSS
+	ldr	r2, grub_total_module_size	@ blob size
+
+	add     r1, r1, #GRUB_KERNEL_MACHINE_STACK_SIZE
+	and	r1, r1, #~0x7	@ Ensure 8-byte alignment
+	
+	sub	sp, r1, #8
+	add     r1, r1, #1024
+
+	str     r1, EXT_C(grub_modbase)
+
+	/* Coreboot already places modules at right place.  */
+#ifndef GRUB_MACHINE_COREBOOT
+	add	r1, r1, r2
+	add	r0, r0, r2
+	sub     r1, r1, #4
+	sub     r0, r0, #4
+
+1:	ldr	r3, [r0], #-4 			@ r3 = *src--
+	str	r3, [r1], #-4			@ *dst-- = r3 
+	subs	r2, #4				@ remaining -= 4
+	bne	1b				@ while remaining != 0
+#endif
+
+	@ Since we _are_ the C run-time, we need to manually zero the BSS
+	@ region before continuing
+	ldr	r0, bss_start_ptr	@ zero from here
+	@ If unaligned, bytewise zero until base address aligned.
+	mov	r2, #0
+1:	tst	r0, #3
+	beq	2f
+	strb	r2, [r0], #1
+	b	1b
+2:	ldr	r1, end_ptr		@ to here
+1:	str	r2, [r0], #4
+	cmp	r0, r1
+	bne	1b
+	
+	b	EXT_C(grub_main)
+
+	.align	3
+@ U-boot/coreboot context stack space
+VARIABLE(grub_arm_saved_registers)
+	.long	0	@ r0
+	.long	0	@ r1
+	.long	0	@ r2
+	.long	0	@ r3
+	.long	0	@ r4
+	.long	0	@ r5
+	.long	0	@ r6
+	.long	0	@ r7
+	.long	0	@ r8
+	.long	0	@ r9
+	.long	0	@ r10
+	.long	0	@ r11
+	.long	0	@ sp
+	.long	0	@ lr
+entry_state:
diff --git a/grub-core/kern/arm/uboot/init.c b/grub-core/kern/arm/uboot/init.c
new file mode 100644
index 0000000..2a6aa3f
--- /dev/null
+++ b/grub-core/kern/arm/uboot/init.c
@@ -0,0 +1,70 @@
+/* init.c - generic U-Boot initialization and finalization */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2016  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/uboot/uboot.h>
+#include <grub/arm/startup.h>
+#include <grub/uboot/api_public.h>
+
+extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
+
+grub_uint32_t
+grub_uboot_get_machine_type (void)
+{
+  return grub_arm_saved_registers.r[1];
+}
+
+grub_addr_t
+grub_uboot_get_boot_data (void)
+{
+  return grub_arm_saved_registers.r[2];
+}
+
+int
+grub_uboot_api_init (void)
+{
+  struct api_signature *start, *end;
+  struct api_signature *p;
+  grub_addr_t grub_uboot_search_hint = grub_arm_saved_registers.sp;
+  if (grub_uboot_search_hint)
+    {
+      /* Extended search range to work around Trim Slice U-Boot issue */
+      start = (struct api_signature *) ((grub_uboot_search_hint & ~0x000fffff)
+					- 0x00500000);
+      end =
+	(struct api_signature *) ((grub_addr_t) start + UBOOT_API_SEARCH_LEN -
+				  API_SIG_MAGLEN + 0x00500000);
+    }
+  else
+    {
+      start = 0;
+      end = (struct api_signature *) (256 * 1024 * 1024);
+    }
+
+  /* Structure alignment is (at least) 8 bytes */
+  for (p = start; p < end; p = (void *) ((grub_addr_t) p + 8))
+    {
+      if (grub_memcmp (&(p->magic), API_SIG_MAGIC, API_SIG_MAGLEN) == 0)
+	{
+	  grub_uboot_syscall_ptr = p->syscall;
+	  return p->version;
+	}
+    }
+
+  return 0;
+}
diff --git a/grub-core/kern/arm/uboot/uboot.S b/grub-core/kern/arm/uboot/uboot.S
new file mode 100644
index 0000000..d128775
--- /dev/null
+++ b/grub-core/kern/arm/uboot/uboot.S
@@ -0,0 +1,73 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/offsets.h>
+#include <grub/symbol.h>
+#include <grub/machine/kernel.h>
+
+	/*
+	 * uboot_syscall():
+	 *   This function is effectively a veneer, so it cannot
+	 *   modify the stack or corrupt any registers other than
+	 *   r12 (ip). Furthermore it needs to restore r8 for
+	 *   U-Boot (Global Data Pointer) and preserve it for Grub.
+	 */
+FUNCTION(grub_uboot_syscall)
+	str     r8, transition_space
+	str     lr, transition_space + 4
+	str     r9, transition_space + 8
+
+	ldr	ip, saved_registers_ptr
+	ldr	r8, [ip, #4 * 8]
+	ldr	r9, [ip, #4 * 9]
+
+	bl	do_syscall
+
+	ldr     r8, transition_space
+	ldr     lr, transition_space + 4
+	ldr     r9, transition_space + 8
+
+	bx	lr
+do_syscall:
+
+	ldr	ip, grub_uboot_syscall_ptr
+	bx	ip
+	
+FUNCTION(grub_uboot_return)
+	ldr	ip, saved_registers_ptr
+	ldr	sp, [ip, #4 * 4]
+	pop	{r4-r12, lr}
+	mov	sp, r12
+	bx	lr
+
+	
+	.align	3
+
+@ GRUB context stack space
+transition_space:	
+	.long	0	@ r8
+	.long	0	@ lr
+	.long	0	@ r9
+
+saved_registers_ptr:
+	.long EXT_C(grub_arm_saved_registers)
+
+VARIABLE(grub_uboot_syscall_ptr)
+	.long	0	@
+
+	END