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lib: sbi: Introduce register_extensions extension callback

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Rather than registering all extensions on their behalf in
sbi_ecall_init(), introduce another extension callback and
invoke that instead. For now, implement each callback by
simply registering the extension, which means this patch
has no intended functional change. In later patches, extension
callbacks will be modified to choose when to register and to
possibly narrow the extension ID range prior to registering.
When an extension range needs to remove IDs, leaving gaps, then
multiple invocations of sbi_ecall_register_extension() may be
used. In summary, later patches for current extensions and the
introductions of future extensions will use the new callback to
ensure that only valid extension IDs from the initial range,
which are also available, will be registered.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2023-05-15 13:12:34 +02:00
committed by Anup Patel
parent dc1c7db05e
commit f58c14090f
14 changed files with 143 additions and 43 deletions
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include/sbi/sbi_ecall.h
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@@ -24,6 +24,7 @@ struct sbi_ecall_extension {
struct sbi_dlist head;
unsigned long extid_start;
unsigned long extid_end;
int (* register_extensions)(void);
int (* probe)(unsigned long extid, unsigned long *out_val);
int (* handle)(unsigned long extid, unsigned long funcid,
const struct sbi_trap_regs *regs,