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https://github.com/AuxXxilium/arc-lkm.git
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110 lines
4.1 KiB
C
Executable File
110 lines
4.1 KiB
C
Executable File
/**
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* Boot device shim ensures that DSM assigns a proper /dev/ device to our USB stick or SATA DOM
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*
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* WHY IS THIS NEEDED?
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* In short the DSM has multiple types of SCSI devices (boot device, USB drive, eSATA drive etc). The boot device is
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* always mounted to /dev/synoboot (with respective partitions at /dev/synobootN). The determination what to place there
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* is made based on different factors depending on the type of device used to boot (see drivers/scsi/sd.c):
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* 1) Standard USB stick
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* - it has to be connected via a real USB port (i.e. not a fake-usb-over-sata like ESXi tries to do)
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* - it must have VID/PID combo of 0xf400/0xf400
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* - allows for normal boot when OS is installed, or triggers OS install/repair screen
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* 2) Force-install USB stick
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* - it has to be connected via a real USB port
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* - it must have VID/PID combo of 0xf401/0xf401
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* - always triggers OS install/repair screen
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* 3) SATA DOM (Disk-on-Module)
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* - kernel is compiled with SATA DOM support (NATIVE_SATA_DOM_SUPPORTED => CONFIG_SYNO_BOOT_SATA_DOM)
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* - is a real SATA (i.e. not SCSI/iSCSI/VirtIO) device
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* - has platform dependent vendor/model strings of CONFIG_SYNO_SATA_DOM_VENDOR/CONFIG_SYNO_SATA_DOM_MODEL
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* - has platform dependent vendor/model strings of CONFIG_SYNO_SATA_DOM_VENDOR_SECOND_SRC/CONFIG_SYNO_SATA_DOM_MODEL_SECOND_SRC
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* - SATA DOM *cannot* be used to force-reinstall (as there isn't an equivalent of USB's VID/PID of 0xf401/0xf401)
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* - restrictions of native SATA-DOM are lifted by sata_port_shim.c and fake_sata_boot_shim.c
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*
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* There are other special ones (e.g. iSCSI) which aren't supported here. These only apply to small subset of platforms.
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*
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* HOW IT WORKS?
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* Depending on the runtime configuration this shim will either engage USB-based shim or SATA-based one. See respective
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* implementations in shim/boot_dev/.
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*
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* References:
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* - See drivers/scsi/sd.c in Linux sources (especially sd_probe() method)
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*/
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#define SHIM_NAME "boot device router"
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#include "boot_device_shim.h"
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#include "shim_base.h"
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#include "../common.h"
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#include "../config/runtime_config.h"
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#include "boot_dev/usb_boot_shim.h"
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#include "boot_dev/fake_sata_boot_shim.h"
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#include "boot_dev/native_sata_boot_shim.h"
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#define BOOT_MEDIA_SHIM_NULL (-1)
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static int registered_type = BOOT_MEDIA_SHIM_NULL;
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int register_boot_shim(const struct boot_media *boot_dev_config)
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{
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shim_reg_in();
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if (unlikely(registered_type != BOOT_MEDIA_SHIM_NULL)) {
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pr_loc_bug("Boot shim is already registered with type=%d", registered_type);
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return -EEXIST;
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}
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int out;
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switch (boot_dev_config->type) {
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case BOOT_MEDIA_USB:
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out = register_usb_boot_shim(boot_dev_config);
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break;
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case BOOT_MEDIA_SATA_DOM:
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out = register_native_sata_boot_shim(boot_dev_config);
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break;
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case BOOT_MEDIA_SATA_DISK:
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out = register_fake_sata_boot_shim(boot_dev_config);
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break;
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default:
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pr_loc_bug("Failed to %s - unknown type=%d", __FUNCTION__, boot_dev_config->type);
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return -EINVAL;
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}
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if (out != 0)
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return out; //individual shims should print what went wrong
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registered_type = boot_dev_config->type;
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shim_reg_ok();
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return 0;
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}
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int unregister_boot_shim(void)
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{
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shim_ureg_in();
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int out;
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switch (registered_type) {
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case BOOT_MEDIA_USB:
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out = unregister_usb_boot_shim();
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break;
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case BOOT_MEDIA_SATA_DOM:
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out = unregister_native_sata_boot_shim();
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break;
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case BOOT_MEDIA_SATA_DISK:
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out = unregister_fake_sata_boot_shim();
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break;
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case BOOT_MEDIA_SHIM_NULL:
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pr_loc_bug("Boot shim is no registered");
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return -ENOENT;
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default: //that cannot happen unless register_boot_shim() is broken
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pr_loc_bug("Failed to %s - unknown type=%d", __FUNCTION__, registered_type);
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return -EINVAL;
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}
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if (out != 0)
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return out; //individual shims should print what went wrong
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registered_type = BOOT_MEDIA_SHIM_NULL;
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shim_ureg_ok();
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return 0;
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} |