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-rw-r--r--grub-core/efiemu/symbols.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/grub-core/efiemu/symbols.c b/grub-core/efiemu/symbols.c
new file mode 100644
index 0000000..cc14855
--- /dev/null
+++ b/grub-core/efiemu/symbols.c
@@ -0,0 +1,272 @@
+/* Code for managing symbols and pointers in efiemu */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 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/err.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/efiemu/efiemu.h>
+#include <grub/efiemu/runtime.h>
+#include <grub/i18n.h>
+
+static int ptv_written = 0;
+static int ptv_alloc = 0;
+static int ptv_handle = 0;
+static int relocated_handle = 0;
+static int ptv_requested = 0;
+static struct grub_efiemu_sym *efiemu_syms = 0;
+
+struct grub_efiemu_sym
+{
+ struct grub_efiemu_sym *next;
+ char *name;
+ int handle;
+ grub_off_t off;
+};
+
+void
+grub_efiemu_free_syms (void)
+{
+ struct grub_efiemu_sym *cur, *d;
+ for (cur = efiemu_syms; cur;)
+ {
+ d = cur->next;
+ grub_free (cur->name);
+ grub_free (cur);
+ cur = d;
+ }
+ efiemu_syms = 0;
+ ptv_written = 0;
+ ptv_alloc = 0;
+ ptv_requested = 0;
+ grub_efiemu_mm_return_request (ptv_handle);
+ ptv_handle = 0;
+ grub_efiemu_mm_return_request (relocated_handle);
+ relocated_handle = 0;
+}
+
+/* Announce that the module will need NUM allocators */
+/* Because of deferred memory allocation all the relocators have to be
+ announced during phase 1*/
+grub_err_t
+grub_efiemu_request_symbols (int num)
+{
+ if (ptv_alloc)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT,
+ "symbols have already been allocated");
+ if (num < 0)
+ return grub_error (GRUB_ERR_BUG,
+ "can't request negative symbols");
+ ptv_requested += num;
+ return GRUB_ERR_NONE;
+}
+
+/* Resolve the symbol name NAME and set HANDLE and OFF accordingly */
+grub_err_t
+grub_efiemu_resolve_symbol (const char *name, int *handle, grub_off_t *off)
+{
+ struct grub_efiemu_sym *cur;
+ for (cur = efiemu_syms; cur; cur = cur->next)
+ if (!grub_strcmp (name, cur->name))
+ {
+ *handle = cur->handle;
+ *off = cur->off;
+ return GRUB_ERR_NONE;
+ }
+ grub_dprintf ("efiemu", "%s not found\n", name);
+ return grub_error (GRUB_ERR_BAD_OS, N_("symbol `%s' not found"), name);
+}
+
+/* Register symbol named NAME in memory handle HANDLE at offset OFF */
+grub_err_t
+grub_efiemu_register_symbol (const char *name, int handle, grub_off_t off)
+{
+ struct grub_efiemu_sym *cur;
+ cur = (struct grub_efiemu_sym *) grub_malloc (sizeof (*cur));
+ grub_dprintf ("efiemu", "registering symbol '%s'\n", name);
+ if (!cur)
+ return grub_errno;
+ cur->name = grub_strdup (name);
+ cur->next = efiemu_syms;
+ cur->handle = handle;
+ cur->off = off;
+ efiemu_syms = cur;
+
+ return 0;
+}
+
+/* Go from phase 1 to phase 2. Must be called before similar function in mm.c */
+grub_err_t
+grub_efiemu_alloc_syms (void)
+{
+ ptv_alloc = ptv_requested;
+ ptv_handle = grub_efiemu_request_memalign
+ (1, (ptv_requested + 1) * sizeof (struct grub_efiemu_ptv_rel),
+ GRUB_EFI_RUNTIME_SERVICES_DATA);
+ relocated_handle = grub_efiemu_request_memalign
+ (1, sizeof (grub_uint8_t), GRUB_EFI_RUNTIME_SERVICES_DATA);
+
+ grub_efiemu_register_symbol ("efiemu_ptv_relocated", relocated_handle, 0);
+ grub_efiemu_register_symbol ("efiemu_ptv_relloc", ptv_handle, 0);
+ return grub_errno;
+}
+
+grub_err_t
+grub_efiemu_write_sym_markers (void)
+{
+ struct grub_efiemu_ptv_rel *ptv_rels
+ = grub_efiemu_mm_obtain_request (ptv_handle);
+ grub_uint8_t *relocated = grub_efiemu_mm_obtain_request (relocated_handle);
+ grub_memset (ptv_rels, 0, (ptv_requested + 1)
+ * sizeof (struct grub_efiemu_ptv_rel));
+ *relocated = 0;
+ return GRUB_ERR_NONE;
+}
+
+/* Write value (pointer to memory PLUS_HANDLE)
+ - (pointer to memory MINUS_HANDLE) + VALUE to ADDR assuming that the
+ size SIZE bytes. If PTV_NEEDED is 1 then announce it to runtime that this
+ value needs to be recomputed before going to virtual mode
+*/
+grub_err_t
+grub_efiemu_write_value (void *addr, grub_uint32_t value, int plus_handle,
+ int minus_handle, int ptv_needed, int size)
+{
+ /* Announce relocator to runtime */
+ if (ptv_needed)
+ {
+ struct grub_efiemu_ptv_rel *ptv_rels
+ = grub_efiemu_mm_obtain_request (ptv_handle);
+
+ if (ptv_needed && ptv_written >= ptv_alloc)
+ return grub_error (GRUB_ERR_BUG,
+ "your module didn't declare efiemu "
+ " relocators correctly");
+
+ if (minus_handle)
+ ptv_rels[ptv_written].minustype
+ = grub_efiemu_mm_get_type (minus_handle);
+ else
+ ptv_rels[ptv_written].minustype = 0;
+
+ if (plus_handle)
+ ptv_rels[ptv_written].plustype
+ = grub_efiemu_mm_get_type (plus_handle);
+ else
+ ptv_rels[ptv_written].plustype = 0;
+
+ ptv_rels[ptv_written].addr = (grub_addr_t) addr;
+ ptv_rels[ptv_written].size = size;
+ ptv_written++;
+
+ /* memset next value to zero to mark the end */
+ grub_memset (&ptv_rels[ptv_written], 0, sizeof (ptv_rels[ptv_written]));
+ }
+
+ /* Compute the value */
+ if (minus_handle)
+ value -= (grub_addr_t) grub_efiemu_mm_obtain_request (minus_handle);
+
+ if (plus_handle)
+ value += (grub_addr_t) grub_efiemu_mm_obtain_request (plus_handle);
+
+ /* Write the value */
+ switch (size)
+ {
+ case 8:
+ *((grub_uint64_t *) addr) = value;
+ break;
+ case 4:
+ *((grub_uint32_t *) addr) = value;
+ break;
+ case 2:
+ *((grub_uint16_t *) addr) = value;
+ break;
+ case 1:
+ *((grub_uint8_t *) addr) = value;
+ break;
+ default:
+ return grub_error (GRUB_ERR_BUG, "wrong symbol size");
+ }
+
+ return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_efiemu_set_virtual_address_map (grub_efi_uintn_t memory_map_size,
+ grub_efi_uintn_t descriptor_size,
+ grub_efi_uint32_t descriptor_version
+ __attribute__ ((unused)),
+ grub_efi_memory_descriptor_t *virtual_map)
+{
+ grub_uint8_t *ptv_relocated;
+ struct grub_efiemu_ptv_rel *cur_relloc;
+ struct grub_efiemu_ptv_rel *ptv_rels;
+
+ ptv_relocated = grub_efiemu_mm_obtain_request (relocated_handle);
+ ptv_rels = grub_efiemu_mm_obtain_request (ptv_handle);
+
+ /* Ensure that we are called only once */
+ if (*ptv_relocated)
+ return grub_error (GRUB_ERR_BUG, "EfiEmu is already relocated");
+ *ptv_relocated = 1;
+
+ /* Correct addresses using information supplied by grub */
+ for (cur_relloc = ptv_rels; cur_relloc->size; cur_relloc++)
+ {
+ grub_int64_t corr = 0;
+ grub_efi_memory_descriptor_t *descptr;
+
+ /* Compute correction */
+ for (descptr = virtual_map;
+ (grub_size_t) ((grub_uint8_t *) descptr
+ - (grub_uint8_t *) virtual_map) < memory_map_size;
+ descptr = (grub_efi_memory_descriptor_t *)
+ ((grub_uint8_t *) descptr + descriptor_size))
+ {
+ if (descptr->type == cur_relloc->plustype)
+ corr += descptr->virtual_start - descptr->physical_start;
+ if (descptr->type == cur_relloc->minustype)
+ corr -= descptr->virtual_start - descptr->physical_start;
+ }
+
+ /* Apply correction */
+ switch (cur_relloc->size)
+ {
+ case 8:
+ *((grub_uint64_t *) (grub_addr_t) cur_relloc->addr) += corr;
+ break;
+ case 4:
+ *((grub_uint32_t *) (grub_addr_t) cur_relloc->addr) += corr;
+ break;
+ case 2:
+ *((grub_uint16_t *) (grub_addr_t) cur_relloc->addr) += corr;
+ break;
+ case 1:
+ *((grub_uint8_t *) (grub_addr_t) cur_relloc->addr) += corr;
+ break;
+ }
+ }
+
+ /* Recompute crc32 of system table and runtime services */
+
+ if (grub_efiemu_sizeof_uintn_t () == 4)
+ return grub_efiemu_crc32 ();
+ else
+ return grub_efiemu_crc64 ();
+}
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