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lib: utils: fdt_domain: Use consistent device-tree address when next-arg1 is missing

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The diagram shown below illustrates the boot-flow involving OP-TEE OS
initialization.

    (1)-----------+
     | U-Boot SPL |
     +------------+
         |
         v
    (2)-------------------------------------------------------------+
     | OpenSBI (fw_dynamic)                                         |
     |                (4)------------------------+                  |
     |                 | optee dispatcher driver |                  |
     +-----------------+-------^---------|-------+------------------+
M-mode   |                     |         |
---------+--[trusted domain]---+----.----+--[untrusted domain]-------
S-mode   |  (coldboot domain)  |    |    |
         v                     |    |    v
    (3)---------------------------+ |(5)----------------------------+
     | OP-TEE OS                  | | | U-Boot                      |
     +----------------------------+ | +-----------------------------+
                                    |    |
                                    |    v
                                    |(6)----------------------------+
                                    | | Linux                       |
                                    | +-----------------------------+

As OP-TEE OS has device-tree node fixups that need to be passed
through to the next boot stages, e.g. the reserved memory node:

  reserved-memory {
    #address-cells = <2>;
    #size-cells = <2>;
    ranges;
    optee_core@f1000000 {
      no-map;
      reg = <0x0 0xf1000000   // OP-TEE OS base address
             0x0 0x01000000>;
    };
    <...>
  };

Instead of using 0x0 as the default value, allow identical next-arg1
to be used by non-coldboot domain (i.e., untrusted domain) when the
property is not provided.

Also, update the description of next-arg1 property in the document.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu Chien Peter Lin 2024-07-24 23:00:54 +08:00 committed by Anup Patel
parent 3d1f53b173
commit 56183ca609
2 changed files with 2 additions and 5 deletions
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4
docs/domain_support.md
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@ -180,9 +180,7 @@ The DT properties of a domain instance DT node are as follows:
boot HART of the domain instance.
* **next-arg1** (Optional) - The 64 bit next booting stage arg1 for the
domain instance. If this DT property is not available and coldboot HART
is not assigned to the domain instance then **0x0** is used as default
value. If this DT property is not available and coldboot HART is assigned
to the domain instance then **next booting stage arg1 of coldboot HART**
is not assigned to the domain instance then **next booting stage arg1 of coldboot HART**
is used as default value.
* **next-addr** (Optional) - The 64 bit next booting stage address for the
domain instance. If this DT property is not available and coldboot HART

3
lib/utils/fdt/fdt_domain.c
View File

@ -395,8 +395,7 @@ static int __fdt_parse_domain(void *fdt, int domain_offset, void *opaque)
val64 = fdt32_to_cpu(val[0]);
val64 = (val64 << 32) | fdt32_to_cpu(val[1]);
} else {
if (domain_offset == *cold_domain_offset)
val64 = sbi_scratch_thishart_ptr()->next_arg1;
val64 = sbi_scratch_thishart_ptr()->next_arg1;
}
dom->next_arg1 = val64;