[Xen-devel] [PATCH v2 12/17] libxl/arm: Add a helper to calculate the ACPI table checksum

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 tools/libxl/libxl_arm_acpi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/libxl/libxl_arm_acpi.c b/tools/libxl/libxl_arm_acpi.c
index 45fc354..d8779af 100644
--- a/tools/libxl/libxl_arm_acpi.c
+++ b/tools/libxl/libxl_arm_acpi.c
@@ -270,6 +270,21 @@ static void make_acpi_dsdt(libxl__gc *gc, struct 
xc_dom_image *dom)
     dom->acpitable_size += ROUNDUP(acpitables[DSDT].size, 3);
 }
 
+static void calculate_checksum(void *table, uint32_t checksum_offset,
+                               uint32_t length)
+{
+    uint8_t *p, sum = 0;
+
+    p = table;
+    p[checksum_offset] = 0;
+
+    while ( length-- )
+        sum = sum + *p++;
+
+    p = table;
+    p[checksum_offset] = -sum;
+}
+
 int libxl__prepare_acpi(libxl__gc *gc, libxl_domain_build_info *info,
                         libxl__domain_build_state *state,
                         struct xc_dom_image *dom)
-- 
2.0.4



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