[coreboot-gerrit] Change in coreboot[master]: acpigen: Add methods for mutex operations

[Patrick Rudolph (Code Review)]

Patrick Rudolph has submitted this change. ( https://review.coreboot.org/c/coreboot/+/37637 )

Change subject: acpigen: Add methods for mutex operations
......................................................................

acpigen: Add methods for mutex operations

Tested on Linux 5.2:
Dumped and decoded the ACPI tables using iasl.

Change-Id: I79310b0f9e2297cf8428d11598935164caf95968
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37637
Tested-by: build bot (Jenkins) 
Reviewed-by: Paul Menzel 
Reviewed-by: Felix Held 
---
M src/arch/x86/acpigen.c
M src/arch/x86/include/arch/acpigen.h
2 files changed, 46 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  Felix Held: Looks good to me, approved

diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index 1d75889..cc724a0 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -403,6 +403,37 @@
    acpigen_write_integer(opreg->regionlen);
 }

+/*
+ * Generate ACPI AML code for Mutex
+ * Arg0: Pointer to name of mutex
+ * Arg1: Initial value of mutex
+ */
+void acpigen_write_mutex(const char *name, const uint8_t flags)
+{
+	/* MutexOp */
+	acpigen_emit_ext_op(MUTEX_OP);
+	/* NameString 4 chars only */
+	acpigen_emit_simple_namestring(name);
+	acpigen_emit_byte(flags);
+}
+
+void acpigen_write_acquire(const char *name, const uint16_t val)
+{
+	/* AcquireOp */
+	acpigen_emit_ext_op(ACQUIRE_OP);
+	/* NameString 4 chars only */
+	acpigen_emit_simple_namestring(name);
+	acpigen_emit_word(val);
+}
+
+void acpigen_write_release(const char *name)
+{
+	/* ReleaseOp */
+	acpigen_emit_ext_op(RELEASE_OP);
+	/* NameString 4 chars only */
+	acpigen_emit_simple_namestring(name);
+}
+
 static void acpigen_write_field_length(uint32_t len)
 {
    uint8_t i, j;
diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h
index 6fd9f73..8b8c873 100644
--- a/src/arch/x86/include/arch/acpigen.h
+++ b/src/arch/x86/include/arch/acpigen.h
@@ -411,6 +411,21 @@
  */
 void acpigen_write_opregion(struct opregion *opreg);
 /*
+ * Generate ACPI AML code for Mutex
+ * This function takes mutex name and initial value.
+ */
+void acpigen_write_mutex(const char *name, const uint8_t flags);
+/*
+ * Generate ACPI AML code for Acquire
+ * This function takes mutex name and privilege value.
+ */
+void acpigen_write_acquire(const char *name, const uint16_t val);
+/*
+ * Generate ACPI AML code for Release
+ * This function takes mutex name.
+ */
+void acpigen_write_release(const char *name);
+/*
  * Generate ACPI AML code for Field
  * This function takes input region name, fieldlist, count & flags.
  */