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-rw-r--r--lib/zlib_dfltcc/dfltcc_util.h110
1 files changed, 110 insertions, 0 deletions
diff --git a/lib/zlib_dfltcc/dfltcc_util.h b/lib/zlib_dfltcc/dfltcc_util.h
new file mode 100644
index 000000000000..82cd1950c416
--- /dev/null
+++ b/lib/zlib_dfltcc/dfltcc_util.h
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: Zlib
+#ifndef DFLTCC_UTIL_H
+#define DFLTCC_UTIL_H
+
+#include <linux/zutil.h>
+#include <asm/facility.h>
+
+/*
+ * C wrapper for the DEFLATE CONVERSION CALL instruction.
+ */
+typedef enum {
+ DFLTCC_CC_OK = 0,
+ DFLTCC_CC_OP1_TOO_SHORT = 1,
+ DFLTCC_CC_OP2_TOO_SHORT = 2,
+ DFLTCC_CC_OP2_CORRUPT = 2,
+ DFLTCC_CC_AGAIN = 3,
+} dfltcc_cc;
+
+#define DFLTCC_QAF 0
+#define DFLTCC_GDHT 1
+#define DFLTCC_CMPR 2
+#define DFLTCC_XPND 4
+#define HBT_CIRCULAR (1 << 7)
+#define HB_BITS 15
+#define HB_SIZE (1 << HB_BITS)
+#define DFLTCC_FACILITY 151
+
+static inline dfltcc_cc dfltcc(
+ int fn,
+ void *param,
+ Byte **op1,
+ size_t *len1,
+ const Byte **op2,
+ size_t *len2,
+ void *hist
+)
+{
+ Byte *t2 = op1 ? *op1 : NULL;
+ size_t t3 = len1 ? *len1 : 0;
+ const Byte *t4 = op2 ? *op2 : NULL;
+ size_t t5 = len2 ? *len2 : 0;
+ register int r0 __asm__("r0") = fn;
+ register void *r1 __asm__("r1") = param;
+ register Byte *r2 __asm__("r2") = t2;
+ register size_t r3 __asm__("r3") = t3;
+ register const Byte *r4 __asm__("r4") = t4;
+ register size_t r5 __asm__("r5") = t5;
+ int cc;
+
+ __asm__ volatile(
+ ".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
+ "ipm %[cc]\n"
+ : [r2] "+r" (r2)
+ , [r3] "+r" (r3)
+ , [r4] "+r" (r4)
+ , [r5] "+r" (r5)
+ , [cc] "=r" (cc)
+ : [r0] "r" (r0)
+ , [r1] "r" (r1)
+ , [hist] "r" (hist)
+ : "cc", "memory");
+ t2 = r2; t3 = r3; t4 = r4; t5 = r5;
+
+ if (op1)
+ *op1 = t2;
+ if (len1)
+ *len1 = t3;
+ if (op2)
+ *op2 = t4;
+ if (len2)
+ *len2 = t5;
+ return (cc >> 28) & 3;
+}
+
+static inline int is_bit_set(
+ const char *bits,
+ int n
+)
+{
+ return bits[n / 8] & (1 << (7 - (n % 8)));
+}
+
+static inline void turn_bit_off(
+ char *bits,
+ int n
+)
+{
+ bits[n / 8] &= ~(1 << (7 - (n % 8)));
+}
+
+static inline int dfltcc_are_params_ok(
+ int level,
+ uInt window_bits,
+ int strategy,
+ uLong level_mask
+)
+{
+ return (level_mask & (1 << level)) != 0 &&
+ (window_bits == HB_BITS) &&
+ (strategy == Z_DEFAULT_STRATEGY);
+}
+
+static inline int is_dfltcc_enabled(void)
+{
+ return test_facility(DFLTCC_FACILITY);
+}
+
+char *oesc_msg(char *buf, int oesc);
+
+#endif /* DFLTCC_UTIL_H */