*** empty log message ***

1 files changed, 157 insertions, 0 deletions

diff --git a/isys/pdc.c b/isys/pdc.c
new file mode 100644
index 000000000..92b968ed4
--- /dev/null
+++ b/isys/pdc.c
@@ -0,0 +1,157 @@
+/*
+   pdc: Promise Fake Raid reader
+	  Copyright (C) 2001
+
+*/
+
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <linux/hdreg.h>
+#include <linux/fs.h>
+#include <string.h>
+
+typedef unsigned int uint32_t;
+
+struct promise_raid_conf {
+    char                promise_id[24];
+#define PR_MAGIC        "Promise Technology, Inc."
+
+    int32_t             dummy_0;
+    int32_t             magic_0;
+    int32_t             dummy_1;
+    int32_t             magic_1;
+    int16_t             dummy_2;
+    int8_t              filler1[470];
+    struct {
+        int32_t flags;                          /* 0x200 */
+#define PR_F_CONFED             0x00000080
+
+        int8_t          dummy_0;
+        int8_t          disk_number;
+        int8_t          channel;
+        int8_t          device;
+        int32_t         magic_0;
+        int32_t         dummy_1;
+        int32_t         dummy_2;                /* 0x210 */
+        int32_t         disk_secs;
+        int32_t         dummy_3;
+        int16_t         dummy_4;
+        int8_t          status;
+#define PR_S_DEFINED            0x01
+#define PR_S_ONLINE             0x02
+#define PR_S_OFFLINE            0x10
+
+        int8_t          type;
+#define PR_T_STRIPE             0x00
+#define PR_T_MIRROR             0x01
+#define PR_T_STRIPE_MIRROR      0x04
+#define PR_T_SPAN               0x08
+
+        u_int8_t        total_disks;            /* 0x220 */
+        u_int8_t        raid0_shift;
+        u_int8_t        raid0_disks;
+        u_int8_t        array_number;
+        u_int32_t       total_secs;
+        u_int16_t       cylinders;
+        u_int8_t        heads;
+        u_int8_t        sectors;
+        int32_t         magic_1;
+        int32_t         dummy_5;                /* 0x230 */
+        struct {
+            int16_t     dummy_0;
+            int8_t      channel;
+            int8_t      device;
+            int32_t     magic_0;
+            int32_t     disk_number;
+        } disk[8];
+    } raid;
+    int32_t             filler2[346];
+    uint32_t            checksum;
+};
+
+
+long long lseek64(int fd, long long offset, int whence);
+
+static unsigned long calc_pdcblock_offset (int fd) {
+	unsigned long lba = 0;
+	struct hd_big_geometry g;
+	long sectors;
+	int sector_size = 1;
+	
+	if (ioctl(fd, HDIO_GETGEO_BIG_RAW, &g))
+	    return -1;
+	    
+	if (ioctl(fd, BLKGETSIZE, &sectors))
+	    return -1;
+	
+	if (ioctl(fd, BLKSSZGET, &sector_size))
+	    return -1;
+
+	sector_size /= 512;
+	g.cylinders = (sectors / (g.heads * g.sectors)) / sector_size;
+
+	lba = g.cylinders * (g.heads*g.sectors);
+	lba = lba - g.sectors;
+	    
+	return lba;
+}
+
+
+static int read_disk_sb (int fd, unsigned char *buffer,int bufsize)
+{
+	int ret = -1;
+	char bh[4096];
+	unsigned long long sb_offset;
+	
+	/*
+	 * Calculate the position of the superblock,
+	 * it's at first sector of the last cylinder
+	 */
+	sb_offset = calc_pdcblock_offset(fd) * 512;
+	if (sb_offset == -1)
+	    return -1;
+	
+	lseek64(fd, sb_offset, SEEK_SET);
+	read (fd, buffer, bufsize);
+
+	ret = 0;
+
+	return ret;
+}
+
+static unsigned int calc_sb_csum (unsigned int* ptr)
+{	
+	unsigned int sum;
+	int count;
+	
+	sum = 0;
+	for (count=0;count<511;count++)
+		sum += *ptr++;
+	
+	return sum;
+}
+
+static int check_disk_sb (void)
+{
+	return 0;
+}
+
+int pdc_dev_running_raid(int fd)
+{
+	int i;
+	struct promise_raid_conf *prom;
+	unsigned char block[4096];
+
+	if (read_disk_sb(fd,(unsigned char*)&block,sizeof(block)))
+	    return -1;
+
+	prom = (struct promise_raid_conf*)&block[0];
+	
+	if (!strcmp(prom->promise_id, "Promise Technology, Inc.") &&
+		(prom->checksum == calc_sb_csum((unsigned int*)prom)))
+	    return 1;
+
+	return 0;
+}