From: David van Moolenbroek <david@minix3.org>
Date: Sun, 13 Jun 2010 10:40:22 +0000 (+0000)
Subject: libdriver: make partition code use a contiguous buffer
X-Git-Tag: v3.1.8~451
X-Git-Url: http://zhaoyanbai.com/repos/%22/xml/v3/zones/static/man.host.html?a=commitdiff_plain;h=eeab8e0680880835d614b54fccae4b56f2fbcb1b;p=minix.git

libdriver: make partition code use a contiguous buffer
---

diff --git a/drivers/at_wini/at_wini.h b/drivers/at_wini/at_wini.h
index 8654f9781..aefa1826b 100644
--- a/drivers/at_wini/at_wini.h
+++ b/drivers/at_wini/at_wini.h
@@ -170,8 +170,6 @@
 #define   ATAPI_IDENTIFY        0xA1    /* identify drive */
 #define   SCSI_READ10           0x28    /* read from disk */
 #define   SCSI_SENSE            0x03    /* sense request */
-
-#define CD_SECTOR_SIZE		2048	/* sector size of a CD-ROM */
 #endif /* ATAPI */
 
 /* Interrupt request lines. */
diff --git a/include/minix/driver.h b/include/minix/driver.h
index 0ee53af52..56af37aaa 100644
--- a/include/minix/driver.h
+++ b/include/minix/driver.h
@@ -83,6 +83,8 @@ _PROTOTYPE( int nop_ioctl, (struct driver *dp, message *m_ptr) );
 #define SECTOR_SHIFT       9	/* for division */
 #define SECTOR_MASK      511	/* and remainder */
 
+#define CD_SECTOR_SIZE  2048	/* sector size of a CD-ROM in bytes */
+
 /* Size of the DMA buffer buffer in bytes. */
 #define USE_EXTRA_DMA_BUF  0	/* usually not needed */
 #define DMA_BUF_SIZE	(DMA_SECTORS * SECTOR_SIZE)
diff --git a/lib/libdriver/driver.c b/lib/libdriver/driver.c
index 6d1dd84d8..36912faef 100644
--- a/lib/libdriver/driver.c
+++ b/lib/libdriver/driver.c
@@ -434,9 +434,14 @@ PUBLIC void driver_init_buffer(void)
  * be used to read partition tables and such.  Its absolute address is
  * 'tmp_phys', the normal address is 'tmp_buf'.
  */
+  vir_bytes size;
 
-  if(!(tmp_buf = alloc_contig(2*DMA_BUF_SIZE, AC_ALIGN4K, &tmp_phys)))
-	panic("can't allocate tmp_buf: %d", DMA_BUF_SIZE);
+  if (tmp_buf == NULL) {
+  	size = MAX(2*DMA_BUF_SIZE, CD_SECTOR_SIZE);
+
+	if(!(tmp_buf = alloc_contig(size, AC_ALIGN4K, &tmp_phys)))
+		panic("can't allocate tmp_buf: %lu", size);
+  }
 }
 
 /*===========================================================================*
diff --git a/lib/libdriver/drvlib.c b/lib/libdriver/drvlib.c
index fd24a9fe9..3172eea2d 100644
--- a/lib/libdriver/drvlib.c
+++ b/lib/libdriver/drvlib.c
@@ -17,10 +17,6 @@ FORWARD _PROTOTYPE( int get_part_table, (struct driver *dp, int device,
 			unsigned long offset, struct part_entry *table));
 FORWARD _PROTOTYPE( void sort, (struct part_entry *table) );
 
-#ifndef CD_SECTOR_SIZE
-#define CD_SECTOR_SIZE 2048
-#endif 
-
 /*============================================================================*
  *				partition				      *
  *============================================================================*/
@@ -158,10 +154,11 @@ struct part_entry *table;	/* four entries */
  */
   iovec_t iovec1;
   u64_t position;
-  static unsigned char partbuf[CD_SECTOR_SIZE];
+
+  driver_init_buffer();
 
   position = mul64u(offset, SECTOR_SIZE);
-  iovec1.iov_addr = (vir_bytes) partbuf;
+  iovec1.iov_addr = (vir_bytes) tmp_buf;
   iovec1.iov_size = CD_SECTOR_SIZE;
   if ((*dp->dr_prepare)(device) != NULL) {
 	(void) (*dp->dr_transfer)(SELF, DEV_GATHER_S, position, &iovec1, 1);
@@ -169,11 +166,11 @@ struct part_entry *table;	/* four entries */
   if (iovec1.iov_size != 0) {
 	return 0;
   }
-  if (partbuf[510] != 0x55 || partbuf[511] != 0xAA) {
+  if (tmp_buf[510] != 0x55 || tmp_buf[511] != 0xAA) {
 	/* Invalid partition table. */
 	return 0;
   }
-  memcpy(table, (partbuf + PART_TABLE_OFF), NR_PARTITIONS * sizeof(table[0]));
+  memcpy(table, (tmp_buf + PART_TABLE_OFF), NR_PARTITIONS * sizeof(table[0]));
   return 1;
 }
 
diff --git a/lib/libsys/alloc_util.c b/lib/libsys/alloc_util.c
index df4ffd77b..40e906c12 100644
--- a/lib/libsys/alloc_util.c
+++ b/lib/libsys/alloc_util.c
@@ -33,7 +33,7 @@ void *alloc_contig(size_t len, int flags, phys_bytes *phys)
 	if(flags & AC_ALIGN64K)
 		mmapflags |= MAP_ALIGN64K;
 
-	/* First try to get memory with mmap. This is gauranteed
+	/* First try to get memory with mmap. This is guaranteed
 	 * to be page-aligned, and we can tell VM it has to be
 	 * pre-allocated and contiguous.
 	 */