Implement efiblk_get_pdinfo_by_device_path
Lookup a block device by it's device path. We use a 'loose' lookup whereby we scan forward to the first Media Path portion of the device path, then look at all our handles for one whose first Media Path matches. This will also work if the device path pointed to has a following file path (or paths) as that's ignored. It assumes that there's only one media path node that describes the entire device, which is true as of the latest UEFI spec (2.7 Errata A) as far as I've been able to determine. Sponsored by: Netflix
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parent
c6c2a73c0c
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00a47597a3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=336655
@ -66,6 +66,7 @@ typedef struct pdinfo
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pdinfo_list_t *efiblk_get_pdinfo_list(struct devsw *dev);
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pdinfo_t *efiblk_get_pdinfo(struct devdesc *dev);
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pdinfo_t *efiblk_get_pdinfo_by_handle(EFI_HANDLE h);
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pdinfo_t *efiblk_get_pdinfo_by_device_path(EFI_DEVICE_PATH *path);
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void *efi_get_table(EFI_GUID *tbl);
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@ -137,6 +137,28 @@ efiblk_get_pdinfo(struct devdesc *dev)
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return (pd);
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}
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pdinfo_t *
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efiblk_get_pdinfo_by_device_path(EFI_DEVICE_PATH *path)
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{
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unsigned i;
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EFI_DEVICE_PATH *media, *devpath;
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EFI_HANDLE h;
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media = efi_devpath_to_media_path(path);
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if (media == NULL)
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return (NULL);
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for (i = 0; i < efipart_nhandles; i++) {
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h = efipart_handles[i];
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devpath = efi_lookup_devpath(h);
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if (devpath == NULL)
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continue;
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if (!efi_devpath_match_node(media, efi_devpath_to_media_path(devpath)))
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continue;
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return (efiblk_get_pdinfo_by_handle(h));
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}
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return (NULL);
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}
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static bool
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same_handle(pdinfo_t *pd, EFI_HANDLE h)
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{
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