diff options
author | Heiko Stuebner <heiko.stuebner@theobroma-systems.com> | 2019-10-23 16:46:40 +0200 |
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committer | Simon Glass <sjg@chromium.org> | 2019-11-14 07:09:34 -0600 |
commit | 6ccb05eae01b660b0585accf338302af1069f419 (patch) | |
tree | 19f20b96462bff2528bef0e675bdc8080242ab8f /lib/optee | |
parent | 357d2ceba0354e29462ac25924f5e42623c22b5b (diff) |
image: fdt: copy possible optee nodes to a loaded devicetree
The loading convention for optee or any other tee on arm64 is as bl32
parameter to the trusted-firmware. So TF-A gets invoked with the TEE as
bl32 and main u-boot as bl33. Once it has done its startup TF-A jumps
into the bl32 for the TEE startup, returns to TF-A and then jumps to bl33.
All of them get passed a devicetree as parameter and all components often
get loaded from a FIT image.
OP-TEE will create additional nodes in that devicetree namely a firmware
node and possibly multiple reserved-memory nodes.
While this devicetree is used in main u-boot, in most cases it won't be
the one passed to the actual kernel. Instead most boot commands will load
a new devicetree from somewhere like mass storage of the network, so if
that happens u-boot should transfer the optee nodes to that new devicetree.
To make that happen introduce optee_copy_fdt_nodes() called from the dt
setup function in image-fdt which after checking for the optee presence
in the u-boot dt will make sure a optee node is present in the kernel dt
and transfer any reserved-memory regions it can find.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'lib/optee')
-rw-r--r-- | lib/optee/optee.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/lib/optee/optee.c b/lib/optee/optee.c index db92cd9af2..c883c498e1 100644 --- a/lib/optee/optee.c +++ b/lib/optee/optee.c @@ -5,6 +5,8 @@ */ #include <common.h> +#include <malloc.h> +#include <linux/libfdt.h> #include <tee/optee.h> #define optee_hdr_err_msg \ @@ -63,3 +65,141 @@ error: return ret; } + +#if defined(CONFIG_OF_LIBFDT) +static int optee_copy_firmware_node(const void *old_blob, void *fdt_blob) +{ + int old_offs, offs, ret, len; + const void *prop; + + old_offs = fdt_path_offset(old_blob, "/firmware/optee"); + if (old_offs < 0) { + debug("Original OP-TEE Device Tree node not found"); + return old_offs; + } + + offs = fdt_path_offset(fdt_blob, "/firmware"); + if (offs < 0) { + offs = fdt_path_offset(fdt_blob, "/"); + if (offs < 0) + return offs; + + offs = fdt_add_subnode(fdt_blob, offs, "firmware"); + if (offs < 0) + return offs; + } + + offs = fdt_add_subnode(fdt_blob, offs, "optee"); + if (offs < 0) + return ret; + + /* copy the compatible property */ + prop = fdt_getprop(old_blob, old_offs, "compatible", &len); + if (!prop) { + debug("missing OP-TEE compatible property"); + return -EINVAL; + } + + ret = fdt_setprop(fdt_blob, offs, "compatible", prop, len); + if (ret < 0) + return ret; + + /* copy the method property */ + prop = fdt_getprop(old_blob, old_offs, "method", &len); + if (!prop) { + debug("missing OP-TEE method property"); + return -EINVAL; + } + + ret = fdt_setprop(fdt_blob, offs, "method", prop, len); + if (ret < 0) + return ret; + + return 0; +} + +int optee_copy_fdt_nodes(const void *old_blob, void *new_blob) +{ + int nodeoffset, subnode, ret; + struct fdt_resource res; + + if (fdt_check_header(old_blob)) + return -EINVAL; + + if (fdt_check_header(new_blob)) + return -EINVAL; + + /* only proceed if there is an /firmware/optee node */ + if (fdt_path_offset(old_blob, "/firmware/optee") < 0) { + debug("No OP-TEE firmware node in old fdt, nothing to do"); + return 0; + } + + /* + * Do not proceed if the target dt already has an OP-TEE node. + * In this case assume that the system knows better somehow, + * so do not interfere. + */ + if (fdt_path_offset(new_blob, "/firmware/optee") >= 0) { + debug("OP-TEE Device Tree node already exists in target"); + return 0; + } + + ret = optee_copy_firmware_node(old_blob, new_blob); + if (ret < 0) { + printf("Failed to add OP-TEE firmware node\n"); + return ret; + } + + /* optee inserts its memory regions as reserved-memory nodes */ + nodeoffset = fdt_subnode_offset(old_blob, 0, "reserved-memory"); + if (nodeoffset >= 0) { + subnode = fdt_first_subnode(old_blob, nodeoffset); + while (subnode >= 0) { + const char *name = fdt_get_name(old_blob, + subnode, NULL); + if (!name) + return -EINVAL; + + /* only handle optee reservations */ + if (strncmp(name, "optee", 5)) + continue; + + /* check if this subnode has a reg property */ + ret = fdt_get_resource(old_blob, subnode, "reg", 0, + &res); + if (!ret) { + struct fdt_memory carveout = { + .start = res.start, + .end = res.end, + }; + char *oldname, *nodename, *tmp; + + oldname = strdup(name); + if (!oldname) + return -ENOMEM; + + tmp = oldname; + nodename = strsep(&tmp, "@"); + if (!nodename) { + free(oldname); + return -EINVAL; + } + + ret = fdtdec_add_reserved_memory(new_blob, + nodename, + &carveout, + NULL); + free(oldname); + + if (ret < 0) + return ret; + } + + subnode = fdt_next_subnode(old_blob, subnode); + } + } + + return 0; +} +#endif |