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acpigen: Add ability to auto-generate _DSM Function 0

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Since the value returned by _DSM function 0 for a given UUID is trivial
to calculate, add the ability to do so to the
acpigen_write_dsm() functions.

Change-Id: Id9be050442485b42202cf91649aa94e56f35032a
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56459
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Tim Wawrzynczak
2021-07-14 15:56:57 -06:00
parent e2b8f30bee
commit d96f3a25b4
2 changed files with 50 additions and 4 deletions
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49
src/acpi/acpigen.c
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@@ -16,6 +16,7 @@
#include <string.h>
#include <acpi/acpigen.h>
#include <assert.h>
#include <commonlib/helpers.h>
#include <console/console.h>
#include <device/device.h>
#include <device/soundwire.h>
@@ -1643,6 +1644,38 @@ void acpigen_write_dsm(const char *uuid, void (**callbacks)(void *),
acpigen_write_dsm_uuid_arr(&id, 1);
}
/*
* Create a supported functions bitmask
* bit 0: other functions than 0 are supported
* bits 1-x: function x supported
*/
static void acpigen_dsm_uuid_enum_functions(const struct dsm_uuid *id)
{
const size_t bytes = DIV_ROUND_UP(id->count, BITS_PER_BYTE);
uint8_t *buffer = alloca(bytes);
bool set = false;
size_t cb_idx = 0;
memset(buffer, 0, bytes);
for (size_t i = 0; i < bytes; i++) {
for (size_t j = 0; j < BITS_PER_BYTE; j++) {
if (cb_idx >= id->count)
break;
if (id->callbacks[cb_idx++]) {
set = true;
buffer[i] |= BIT(j);
}
}
}
if (set)
buffer[0] |= BIT(0);
acpigen_write_return_byte_buffer(buffer, bytes);
}
static void acpigen_write_dsm_uuid(struct dsm_uuid *id)
{
size_t i;
@@ -1656,7 +1689,17 @@ static void acpigen_write_dsm_uuid(struct dsm_uuid *id)
/* ToInteger (Arg2, Local1) */
acpigen_write_to_integer(ARG2_OP, LOCAL1_OP);
for (i = 0; i < id->count; i++) {
/* If (LEqual(Local1, 0)) */
{
acpigen_write_if_lequal_op_int(LOCAL1_OP, 0);
if (id->callbacks[0])
id->callbacks[0](id->arg);
else if (id->count)
acpigen_dsm_uuid_enum_functions(id);
acpigen_write_if_end();
}
for (i = 1; i < id->count; i++) {
/* If (LEqual (Local1, i)) */
acpigen_write_if_lequal_op_int(LOCAL1_OP, i);
@@ -1664,13 +1707,13 @@ static void acpigen_write_dsm_uuid(struct dsm_uuid *id)
if (id->callbacks[i])
id->callbacks[i](id->arg);
acpigen_pop_len(); /* If */
acpigen_write_if_end(); /* If */
}
/* Default case: Return (Buffer (One) { 0x0 }) */
acpigen_write_return_singleton_buffer(0x0);
acpigen_pop_len(); /* If (LEqual (Local0, ToUUID(uuid))) */
acpigen_write_if_end(); /* If (LEqual (Local0, ToUUID(uuid))) */
}