1 files changed, 74 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/mkpiggy.c b/arch/x86/boot/compressed/mkpiggy.c
new file mode 100644
index 000000000..52aa56cdb
--- /dev/null
+++ b/arch/x86/boot/compressed/mkpiggy.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* ----------------------------------------------------------------------- *
+ *
+ *  Copyright (C) 2009 Intel Corporation. All rights reserved.
+ *
+ *  H. Peter Anvin <hpa@linux.intel.com>
+ *
+ * -----------------------------------------------------------------------
+ *
+ * Outputs a small assembly wrapper with the appropriate symbols defined.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <tools/le_byteshift.h>
+
+int main(int argc, char *argv[])
+{
+	uint32_t olen;
+	long ilen;
+	FILE *f = NULL;
+	int retval = 1;
+
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
+		goto bail;
+	}
+
+	/* Get the information for the compressed kernel image first */
+
+	f = fopen(argv[1], "r");
+	if (!f) {
+		perror(argv[1]);
+		goto bail;
+	}
+
+
+	if (fseek(f, -4L, SEEK_END)) {
+		perror(argv[1]);
+	}
+
+	if (fread(&olen, sizeof(olen), 1, f) != 1) {
+		perror(argv[1]);
+		goto bail;
+	}
+
+	ilen = ftell(f);
+	olen = get_unaligned_le32(&olen);
+
+	printf(".section \".rodata..compressed\",\"a\",@progbits\n");
+	printf(".globl z_input_len\n");
+	printf("z_input_len = %lu\n", ilen);
+	printf(".globl z_output_len\n");
+	printf("z_output_len = %lu\n", (unsigned long)olen);
+
+	printf(".globl input_data, input_data_end\n");
+	printf("input_data:\n");
+	printf(".incbin \"%s\"\n", argv[1]);
+	printf("input_data_end:\n");
+
+	printf(".section \".rodata\",\"a\",@progbits\n");
+	printf(".globl input_len\n");
+	printf("input_len:\n\t.long %lu\n", ilen);
+	printf(".globl output_len\n");
+	printf("output_len:\n\t.long %lu\n", (unsigned long)olen);
+
+	retval = 0;
+bail:
+	if (f)
+		fclose(f);
+	return retval;
+}