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fs: Add semihosting filesystem

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This adds a filesystem which is backed by the host's filesystem. It is
modeled off of sandboxfs, which has very similar aims. Semihosting
doesn't support listing directories (except with SYS_SYSTEM), so neither
do we. it's possible to optimize a bit for the common case of reading a
whole file by omitting a call to smh_seek, but this is left as a future
optimization.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
This commit is contained in:
Sean Anderson
2022-03-22 16:59:20 -04:00
committed by Tom Rini
parent 8e1c9fe243
commit f676b45151
6 changed files with 160 additions and 2 deletions
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4
disk/part.c
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@@ -455,7 +455,7 @@ int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
int part;
struct disk_partition tmpinfo;
#ifdef CONFIG_SANDBOX
#if IS_ENABLED(CONFIG_SANDBOX) || IS_ENABLED(CONFIG_SEMIHOSTING)
/*
* Special-case a pseudo block device "hostfs", to allow access to the
* host's own filesystem.
@@ -467,7 +467,7 @@ int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
info->blksz = 0;
info->bootable = 0;
strcpy((char *)info->type, BOOT_PART_TYPE);
strcpy((char *)info->name, "Sandbox host");
strcpy((char *)info->name, "Host filesystem");
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
info->uuid[0] = 0;
#endif