geometry: Add boot_lchs_find_*() utility functions

Adding the following utility functions:

    * boot_lchs_find_pci_device
    * boot_lchs_find_scsi_device
    * boot_lchs_find_ata_device

These will be used to apply LCHS values received through fw_cfg.

Reviewed-by: Karl Heubaum <karl.heubaum@oracle.com>
Reviewed-by: Arbel Moshe <arbel.moshe@oracle.com>
Signed-off-by: Sam Eiderman <shmuel.eiderman@oracle.com>
Message-Id: <20190626123816.8907-5-shmuel.eiderman@oracle.com>

src/Kconfig

@@ -72,6 +72,13 @@ endchoice
         help
             Support controlling of the boot order via the fw_cfg/CBFS
             "bootorder" file.
+    config HOST_BIOS_GEOMETRY
+        depends on BOOT
+        bool "Boot device bios geometry override"
+        default y
+        help
+            Support overriding bios (logical) geometry of boot devices via the
+            fw_cfg/CBFS "bios-geometry" file.
 
     config COREBOOT_FLASH
         depends on COREBOOT

src/boot.c

@@ -129,6 +129,8 @@ parse_u32(char *cur, u32 *n)
 static void
 loadBiosGeometry(void)
 {
+    if (!CONFIG_HOST_BIOS_GEOMETRY)
+        return;
     char *f = romfile_loadfile("bios-geometry", NULL);
     if (!f)
         return;
@@ -168,6 +170,73 @@ loadBiosGeometry(void)
     } while (f);
 }
 
+// Search the bios-geometry list for the given glob pattern.
+static BootDeviceLCHS *
+boot_lchs_find(const char *glob)
+{
+    dprintf(1, "Searching bios-geometry for: %s\n", glob);
+    int i;
+    for (i = 0; i < BiosGeometryCount; i++)
+        if (glob_prefix(glob, BiosGeometry[i].name))
+            return &BiosGeometry[i];
+    return NULL;
+}
+
+int boot_lchs_find_pci_device(struct pci_device *pci, struct chs_s *chs)
+{
+    if (!CONFIG_HOST_BIOS_GEOMETRY)
+        return -1;
+    char desc[256];
+    build_pci_path(desc, sizeof(desc), "*", pci);
+    BootDeviceLCHS *b = boot_lchs_find(desc);
+    if (!b)
+        return -1;
+    chs->cylinder = (u16)b->lcyls;
+    chs->head = (u16)b->lheads;
+    chs->sector = (u16)b->lsecs;
+    return 0;
+}
+
+int boot_lchs_find_scsi_device(struct pci_device *pci, int target, int lun,
+                               struct chs_s *chs)
+{
+    if (!CONFIG_HOST_BIOS_GEOMETRY)
+        return -1;
+    if (!pci)
+        // support only pci machine for now
+        return -1;
+    // Find scsi drive - for example: /pci@i0cf8/scsi@5/channel@0/disk@1,0
+    char desc[256];
+    build_scsi_path(desc, sizeof(desc), pci, target, lun);
+    BootDeviceLCHS *b = boot_lchs_find(desc);
+    if (!b)
+        return -1;
+    chs->cylinder = (u16)b->lcyls;
+    chs->head = (u16)b->lheads;
+    chs->sector = (u16)b->lsecs;
+    return 0;
+}
+
+int boot_lchs_find_ata_device(struct pci_device *pci, int chanid, int slave,
+                              struct chs_s *chs)
+{
+    if (!CONFIG_HOST_BIOS_GEOMETRY)
+        return -1;
+    if (!pci)
+        // support only pci machine for now
+        return -1;
+    // Find ata drive - for example: /pci@i0cf8/ide@1,1/drive@1/disk@0
+    char desc[256];
+    build_ata_path(desc, sizeof(desc), pci, chanid, slave);
+    BootDeviceLCHS *b = boot_lchs_find(desc);
+    if (!b)
+        return -1;
+    chs->cylinder = (u16)b->lcyls;
+    chs->head = (u16)b->lheads;
+    chs->sector = (u16)b->lsecs;
+    return 0;
+}
+
 
 /****************************************************************
  * Boot priority ordering

src/util.h

@@ -38,6 +38,12 @@ struct usbdevice_s;
 int bootprio_find_usb(struct usbdevice_s *usbdev, int lun);
 int get_keystroke_full(int msec);
 int get_keystroke(int msec);
+struct chs_s;
+int boot_lchs_find_pci_device(struct pci_device *pci, struct chs_s *chs);
+int boot_lchs_find_scsi_device(struct pci_device *pci, int target, int lun,
+                               struct chs_s *chs);
+int boot_lchs_find_ata_device(struct pci_device *pci, int chanid, int slave,
+                              struct chs_s *chs);
 
 // bootsplash.c
 void enable_vga_console(void);