Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / powerpc / lib / ticks.S

diff --git a/qemu/roms/u-boot/arch/powerpc/lib/ticks.S b/qemu/roms/u-boot/arch/powerpc/lib/ticks.S
new file mode 100644 (file)
index 0000000..0473a63
--- /dev/null
+++ b/qemu/roms/u-boot/arch/powerpc/lib/ticks.S
@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2000, 2001
+ * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
+ *  base on code by
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+#include <config.h>
+#include <watchdog.h>
+
+/*
+ * unsigned long long get_ticks(void);
+ *
+ * read timebase as "long long"
+ */
+       .globl  get_ticks
+get_ticks:
+1:     mftbu   r3
+       mftb    r4
+       mftbu   r5
+       cmp     0,r3,r5
+       bne     1b
+       blr
+
+/*
+ * Delay for a number of ticks
+ */
+       .globl  wait_ticks
+wait_ticks:
+       stwu    r1, -16(r1)
+       mflr    r0              /* save link register */
+       stw     r0, 20(r1)      /* Use r0 or GDB will be unhappy */
+       stw     r14, 12(r1)     /* save used registers */
+       stw     r15, 8(r1)
+       mr      r14, r3         /* save tick count */
+       bl      get_ticks       /* Get start time */
+
+       /* Calculate end time */
+       addc    r14, r4, r14    /* Compute end time lower */
+       addze   r15, r3         /*     and end time upper */
+
+       WATCHDOG_RESET          /* Trigger watchdog, if needed */
+1:     bl      get_ticks       /* Get current time */
+       subfc   r4, r4, r14     /* Subtract current time from end time */
+       subfe.  r3, r3, r15
+       bge     1b              /* Loop until time expired */
+
+       lwz     r15, 8(r1)      /* restore saved registers */
+       lwz     r14, 12(r1)
+       lwz     r0, 20(r1)
+       addi    r1,r1,16
+       mtlr    r0
+       blr