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authorMichal Simek <monstr@monstr.eu>2007-04-21 21:02:40 +0200
committerMichal Simek <monstr@monstr.eu>2007-04-21 21:02:40 +0200
commit0643631aa1036cd746bf5d15f5a34bc7bc01ea4f (patch)
tree4cf723e9fd6923b10c3b9495236215f84b2297ee /cpu/microblaze
parent9d1d6a34d26c5933bc097ce73c9348f95573cdd4 (diff)
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16bit read/write little endian
Diffstat (limited to 'cpu/microblaze')
-rw-r--r--cpu/microblaze/start.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/cpu/microblaze/start.S b/cpu/microblaze/start.S
index 29481af..4538158 100644
--- a/cpu/microblaze/start.S
+++ b/cpu/microblaze/start.S
@@ -117,3 +117,36 @@ clear_bss:
3: /* jumping to board_init */
brai board_init
1: bri 1b
+
+/*
+ * Read 16bit little endian
+ */
+ .text
+ .global in16
+ .ent in16
+ .align 2
+in16: lhu r3, r0, r5
+ bslli r4, r3, 8
+ bsrli r3, r3, 8
+ andi r4, r4, 0xffff
+ or r3, r3, r4
+ rtsd r15, 8
+ sext16 r3, r3
+ .end in16
+
+/*
+ * Write 16bit little endian
+ * first parameter(r5) - address, second(r6) - short value
+ */
+ .text
+ .global out16
+ .ent out16
+ .align 2
+out16: bslli r3, r6, 8
+ bsrli r6, r6, 8
+ andi r3, r3, 0xffff
+ or r3, r3, r6
+ sh r3, r0, r5
+ rtsd r15, 8
+ or r0, r0, r0
+ .end out16