fish

1 files changed, 142 insertions, 0 deletions

diff --git a/grub-core/lib/powerpc/relocator.c b/grub-core/lib/powerpc/relocator.c
new file mode 100644
index 0000000..85dfbea
--- /dev/null
+++ b/grub-core/lib/powerpc/relocator.c
@@ -0,0 +1,142 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009,2010  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/misc.h>
+
+#include <grub/types.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/cache.h>
+
+#include <grub/powerpc/relocator.h>
+#include <grub/relocator_private.h>
+
+extern grub_uint8_t grub_relocator_forward_start;
+extern grub_uint8_t grub_relocator_forward_end;
+extern grub_uint8_t grub_relocator_backward_start;
+extern grub_uint8_t grub_relocator_backward_end;
+
+#define REGW_SIZEOF (2 * sizeof (grub_uint32_t))
+#define JUMP_SIZEOF (sizeof (grub_uint32_t))
+
+#define RELOCATOR_SRC_SIZEOF(x) (&grub_relocator_##x##_end \
+				 - &grub_relocator_##x##_start)
+#define RELOCATOR_SIZEOF(x)	(RELOCATOR_SRC_SIZEOF(x) \
+				 + REGW_SIZEOF * 3)
+grub_size_t grub_relocator_align = sizeof (grub_uint32_t);
+grub_size_t grub_relocator_forward_size;
+grub_size_t grub_relocator_backward_size;
+grub_size_t grub_relocator_jumper_size = JUMP_SIZEOF + REGW_SIZEOF;
+
+void
+grub_cpu_relocator_init (void)
+{
+  grub_relocator_forward_size = RELOCATOR_SIZEOF(forward);
+  grub_relocator_backward_size = RELOCATOR_SIZEOF(backward);
+}
+
+static void
+write_reg (int regn, grub_uint32_t val, void **target)
+{
+  /* lis r, val >> 16  */
+  *(grub_uint32_t *) *target = 
+    ((0x3c00 | (regn << 5)) << 16) | (val >> 16);
+  *target = ((grub_uint32_t *) *target) + 1;
+  /* ori r, r, val & 0xffff. */
+  *(grub_uint32_t *) *target = (((0x6000 | regn << 5 | regn) << 16)
+				| (val & 0xffff));
+  *target = ((grub_uint32_t *) *target) + 1;
+}
+
+static void
+write_jump (void **target)
+{
+  /* blr.  */
+  *(grub_uint32_t *) *target = 0x4e800020;
+  *target = ((grub_uint32_t *) *target) + 1;
+}
+
+void
+grub_cpu_relocator_jumper (void *rels, grub_addr_t addr)
+{
+  write_reg (GRUB_PPC_JUMP_REGISTER, addr, &rels);
+  write_jump (&rels);
+}
+
+void
+grub_cpu_relocator_backward (void *ptr0, void *src, void *dest,
+			     grub_size_t size)
+{
+  void *ptr = ptr0;
+  write_reg (8, (grub_uint32_t) src, &ptr);
+  write_reg (9, (grub_uint32_t) dest, &ptr);
+  write_reg (10, (grub_uint32_t) size, &ptr);
+  grub_memcpy (ptr, &grub_relocator_backward_start,
+	       RELOCATOR_SRC_SIZEOF (backward));
+}
+
+void
+grub_cpu_relocator_forward (void *ptr0, void *src, void *dest,
+			     grub_size_t size)
+{
+  void *ptr = ptr0;
+  write_reg (8, (grub_uint32_t) src, &ptr);
+  write_reg (9, (grub_uint32_t) dest, &ptr);
+  write_reg (10, (grub_uint32_t) size, &ptr);
+  grub_memcpy (ptr, &grub_relocator_forward_start, 
+	       RELOCATOR_SRC_SIZEOF (forward));
+}
+
+grub_err_t
+grub_relocator32_boot (struct grub_relocator *rel,
+		       struct grub_relocator32_state state)
+{
+  void *ptr;
+  grub_err_t err;
+  void *relst;
+  grub_size_t relsize;
+  grub_size_t stateset_size = 32 * REGW_SIZEOF + JUMP_SIZEOF;
+  unsigned i;
+  grub_relocator_chunk_t ch;
+
+  err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
+					  (0xffffffff - stateset_size)
+					  + 1, stateset_size,
+					  sizeof (grub_uint32_t),
+					  GRUB_RELOCATOR_PREFERENCE_NONE);
+  if (err)
+    return err;
+
+  ptr = get_virtual_current_address (ch);
+  for (i = 0; i < 32; i++)
+    write_reg (i, state.gpr[i], &ptr);
+  write_jump (&ptr);
+
+  err = grub_relocator_prepare_relocs (rel, get_physical_target_address (ch),
+				       &relst, &relsize);
+  if (err)
+    return err;
+
+  grub_arch_sync_caches ((void *) relst, relsize);
+
+  ((void (*) (void)) relst) ();
+
+  /* Not reached.  */
+  return GRUB_ERR_NONE;
+}