From f3d54fc4948b5525cc15e2a082f0cec8610ec5b4 Mon Sep 17 00:00:00 2001
From: aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Tue, 25 Nov 2008 21:50:24 +0000
Subject: Abstract out geometry detection code from IDE for reuse

Virtio will want to use the geometry detection code.  It doesn't belong
in ide.c anyway.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5797 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/ide.c | 112 ++++-----------------------------------------------------------
 1 file changed, 6 insertions(+), 106 deletions(-)

(limited to 'hw')

diff --git a/hw/ide.c b/hw/ide.c
index 9f217cc574..132d16246c 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -2676,69 +2676,13 @@ static void ide_reset(IDEState *s)
     s->media_changed = 0;
 }
 
-struct partition {
-	uint8_t boot_ind;		/* 0x80 - active */
-	uint8_t head;		/* starting head */
-	uint8_t sector;		/* starting sector */
-	uint8_t cyl;		/* starting cylinder */
-	uint8_t sys_ind;		/* What partition type */
-	uint8_t end_head;		/* end head */
-	uint8_t end_sector;	/* end sector */
-	uint8_t end_cyl;		/* end cylinder */
-	uint32_t start_sect;	/* starting sector counting from 0 */
-	uint32_t nr_sects;		/* nr of sectors in partition */
-} __attribute__((packed));
-
-/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
-static int guess_disk_lchs(IDEState *s,
-                           int *pcylinders, int *pheads, int *psectors)
-{
-    uint8_t *buf = s->io_buffer;
-    int ret, i, heads, sectors, cylinders;
-    struct partition *p;
-    uint32_t nr_sects;
-
-    ret = bdrv_read(s->bs, 0, buf, 1);
-    if (ret < 0) {
-        return -1;
-    }
-    /* test msdos magic */
-    if (buf[510] != 0x55 || buf[511] != 0xaa) {
-        return -1;
-    }
-    for(i = 0; i < 4; i++) {
-        p = ((struct partition *)(buf + 0x1be)) + i;
-        nr_sects = le32_to_cpu(p->nr_sects);
-        if (nr_sects && p->end_head) {
-            /* We make the assumption that the partition terminates on
-               a cylinder boundary */
-            heads = p->end_head + 1;
-            sectors = p->end_sector & 63;
-            if (sectors == 0)
-                continue;
-            cylinders = s->nb_sectors / (heads * sectors);
-            if (cylinders < 1 || cylinders > 16383)
-                continue;
-            *pheads = heads;
-            *psectors = sectors;
-            *pcylinders = cylinders;
-#if 0
-            printf("guessed geometry: LCHS=%d %d %d\n",
-                   cylinders, heads, sectors);
-#endif
-            return 0;
-        }
-    }
-    return -1;
-}
-
 static void ide_init2(IDEState *ide_state,
                       BlockDriverState *hd0, BlockDriverState *hd1,
                       qemu_irq irq)
 {
     IDEState *s;
     static int drive_serial = 1;
-    int i, cylinders, heads, secs, translation, lba_detected = 0;
+    int i, cylinders, heads, secs;
     uint64_t nb_sectors;
 
     for(i = 0; i < 2; i++) {
@@ -2750,56 +2694,12 @@ static void ide_init2(IDEState *ide_state,
             s->bs = hd1;
         if (s->bs) {
             bdrv_get_geometry(s->bs, &nb_sectors);
+            bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
+            s->cylinders = cylinders;
+            s->heads = heads;
+            s->sectors = secs;
             s->nb_sectors = nb_sectors;
-            /* if a geometry hint is available, use it */
-            bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs);
-            translation = bdrv_get_translation_hint(s->bs);
-            if (cylinders != 0) {
-                s->cylinders = cylinders;
-                s->heads = heads;
-                s->sectors = secs;
-            } else {
-                if (guess_disk_lchs(s, &cylinders, &heads, &secs) == 0) {
-                    if (heads > 16) {
-                        /* if heads > 16, it means that a BIOS LBA
-                           translation was active, so the default
-                           hardware geometry is OK */
-                        lba_detected = 1;
-                        goto default_geometry;
-                    } else {
-                        s->cylinders = cylinders;
-                        s->heads = heads;
-                        s->sectors = secs;
-                        /* disable any translation to be in sync with
-                           the logical geometry */
-                        if (translation == BIOS_ATA_TRANSLATION_AUTO) {
-                            bdrv_set_translation_hint(s->bs,
-                                                      BIOS_ATA_TRANSLATION_NONE);
-                        }
-                    }
-                } else {
-                default_geometry:
-                    /* if no geometry, use a standard physical disk geometry */
-                    cylinders = nb_sectors / (16 * 63);
-                    if (cylinders > 16383)
-                        cylinders = 16383;
-                    else if (cylinders < 2)
-                        cylinders = 2;
-                    s->cylinders = cylinders;
-                    s->heads = 16;
-                    s->sectors = 63;
-                    if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
-                      if ((s->cylinders * s->heads) <= 131072) {
-                        bdrv_set_translation_hint(s->bs,
-                                                  BIOS_ATA_TRANSLATION_LARGE);
-                      } else {
-                        bdrv_set_translation_hint(s->bs,
-                                                  BIOS_ATA_TRANSLATION_LBA);
-                      }
-                    }
-                }
-                bdrv_set_geometry_hint(s->bs, s->cylinders, s->heads, s->sectors);
-            }
+
             if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
                 s->is_cdrom = 1;
 		bdrv_set_change_cb(s->bs, cdrom_change_cb, s);
-- 
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