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diff --git a/usr.sbin/bhyve/basl.h b/usr.sbin/bhyve/basl.h
--- a/usr.sbin/bhyve/basl.h
+++ b/usr.sbin/bhyve/basl.h
@@ -8,6 +8,13 @@
#include <contrib/dev/acpica/include/acpi.h>
+#define ACPI_GAS_ACCESS_WIDTH_LEGACY 0
+#define ACPI_GAS_ACCESS_WIDTH_UNDEFINED 0
+#define ACPI_GAS_ACCESS_WIDTH_BYTE 1
+#define ACPI_GAS_ACCESS_WIDTH_WORD 2
+#define ACPI_GAS_ACCESS_WIDTH_DWORD 3
+#define ACPI_GAS_ACCESS_WIDTH_QWORD 4
+
#define BHYVE_ACPI_BASE 0xf2400
#define BASL_TABLE_ALIGNMENT 0x10
@@ -32,6 +39,9 @@
int basl_init(void);
int basl_table_append_bytes(struct basl_table *table, const void *bytes,
uint32_t len);
+int basl_table_append_gas(struct basl_table *table, uint8_t space_id,
+ uint8_t bit_width, uint8_t bit_offset, uint8_t access_width,
+ uint64_t address);
int basl_table_append_int(struct basl_table *table, uint64_t val, uint8_t size);
int basl_table_create(struct basl_table **table, struct vmctx *ctx,
const uint8_t *name, uint32_t alignment, uint32_t off);
diff --git a/usr.sbin/bhyve/basl.c b/usr.sbin/bhyve/basl.c
--- a/usr.sbin/bhyve/basl.c
+++ b/usr.sbin/bhyve/basl.c
@@ -156,6 +156,22 @@
return (0);
}
+int
+basl_table_append_gas(struct basl_table *const table, const uint8_t space_id,
+ const uint8_t bit_width, const uint8_t bit_offset,
+ const uint8_t access_width, const uint64_t address)
+{
+ ACPI_GENERIC_ADDRESS gas_le = {
+ .SpaceId = space_id,
+ .BitWidth = bit_width,
+ .BitOffset = bit_offset,
+ .AccessWidth = access_width,
+ .Address = htole64(address),
+ };
+
+ return (basl_table_append_bytes(table, &gas_le, sizeof(gas_le)));
+}
+
int
basl_table_append_int(struct basl_table *const table, const uint64_t val,
const uint8_t size)

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