Changeset cffa82aa in mainline

Timestamp:

2015-11-04T18:39:51Z (9 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

f71b938

Parents:

eed70f1

Message:

Implement GPT protective MBR.

Location:

uspace/lib/label

Files:

• include/std/mbr.h (modified) (1 diff)
• src/gpt.c (modified) (5 diffs)

uspace/lib/label/include/std/mbr.h

@@ -73 +73 @@
         mbr_pt_minix        = 0x81,
         /** Linux */
-        mbr_pt_linux        = 0x83
+        mbr_pt_linux        = 0x83,
+        /** GPT Protective */
+        mbr_pt_gpt_protect  = 0xee 
 };
 

uspace/lib/label/src/gpt.c

@@ -39 +39 @@
 #include <errno.h>
 #include <mem.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <uuid.h>
 
+#include "std/mbr.h"
 #include "std/gpt.h"
 #include "gpt.h"
@@ -68 +70 @@
 static void gpt_hdr_compute_crc(gpt_header_t *, size_t);
 static int gpt_hdr_get_crc(gpt_header_t *, size_t, uint32_t *);
+
+static int gpt_pmbr_create(service_id_t, size_t, uint64_t);
+static int gpt_pmbr_destroy(service_id_t, size_t);
 
 const uint8_t efi_signature[8] = {
@@ -375 +380 @@
         }
 
+        rc = gpt_pmbr_create(sid, bsize, nblocks);
+        if (rc != EOK) {
+                rc = EIO;
+                goto error;
+        }
+
         uuid_generate(&disk_uuid);
 
@@ -538 +549 @@
         }
 
+        rc = gpt_pmbr_destroy(label->svc_id, label->block_size);
+        if (rc != EOK)
+                goto error;
+
         free(label);
         return EOK;
@@ -957 +972 @@
 }
 
+/** Create GPT Protective MBR */
+static int gpt_pmbr_create(service_id_t sid, size_t bsize, uint64_t nblocks)
+{
+        mbr_br_block_t *pmbr = NULL;
+        uint64_t pmbr_nb;
+        int rc;
+
+        pmbr = calloc(1, bsize);
+        if (pmbr == NULL) {
+                rc = ENOMEM;
+                goto error;
+        }
+
+        pmbr_nb = nblocks - gpt_hdr_ba;
+
+        pmbr->pte[0].ptype = mbr_pt_gpt_protect;
+        pmbr->pte[0].first_lba = gpt_hdr_ba;
+
+        if (pmbr_nb <= UINT32_MAX)
+                pmbr->pte[0].length = host2uint32_t_le((uint32_t)pmbr_nb);
+        else
+                pmbr->pte[0].length = host2uint32_t_le(UINT32_MAX);
+
+        pmbr->signature = host2uint16_t_le(mbr_br_signature);
+
+        rc = block_write_direct(sid, mbr_ba, 1, pmbr);
+        if (rc != EOK) {
+                rc = EIO;
+                goto error;
+        }
+
+        free(pmbr);
+        return EOK;
+error:
+        free(pmbr);
+        return rc;
+}
+
+/** Destroy GPT Protective MBR */
+static int gpt_pmbr_destroy(service_id_t sid, size_t bsize)
+{
+        mbr_br_block_t *pmbr = NULL;
+        int rc;
+
+        pmbr = calloc(1, bsize);
+        if (pmbr == NULL) {
+                rc = ENOMEM;
+                goto error;
+        }
+
+        rc = block_write_direct(sid, mbr_ba, 1, pmbr);
+        if (rc != EOK) {
+                rc = EIO;
+                goto error;
+        }
+
+        free(pmbr);
+        return EOK;
+error:
+        free(pmbr);
+        return rc;
+}
+
 /** @}
  */