Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / boot / compressed / ll_char_wr.S

diff --git a/kernel/arch/arm/boot/compressed/ll_char_wr.S b/kernel/arch/arm/boot/compressed/ll_char_wr.S
new file mode 100644 (file)
index 0000000..8517c86
--- /dev/null
+++ b/kernel/arch/arm/boot/compressed/ll_char_wr.S
@@ -0,0 +1,134 @@
+/*
+ *  linux/arch/arm/lib/ll_char_wr.S
+ *
+ *  Copyright (C) 1995, 1996 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Speedups & 1bpp code (C) 1996 Philip Blundell & Russell King.
+ *
+ *  10-04-96   RMK     Various cleanups & reduced register usage.
+ *  08-04-98   RMK     Shifts re-ordered
+ */
+
+@ Regs: [] = corruptible
+@       {} = used
+@       () = do not use
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+       .text
+
+LC0:   .word   LC0
+       .word   bytes_per_char_h
+       .word   video_size_row
+       .word   acorndata_8x8
+       .word   con_charconvtable
+
+/*
+ * r0 = ptr
+ * r1 = char
+ * r2 = white
+ */
+ENTRY(ll_write_char)
+       stmfd   sp!, {r4 - r7, lr}
+@
+@ Smashable regs: {r0 - r3}, [r4 - r7], (r8 - fp), [ip], (sp), [lr], (pc)
+@
+       /*
+        * calculate offset into character table
+        */
+       mov     r1, r1, lsl #3
+       /*
+        * calculate offset required for each row.
+        */
+       adr     ip, LC0
+       ldmia   ip, {r3, r4, r5, r6, lr}
+       sub     ip, ip, r3
+       add     r6, r6, ip
+       add     lr, lr, ip
+       ldr     r4, [r4, ip]
+       ldr     r5, [r5, ip]
+       /*
+        * Go to resolution-dependent routine...
+        */
+       cmp     r4, #4
+       blt     Lrow1bpp
+       add     r0, r0, r5, lsl #3              @ Move to bottom of character
+       orr     r1, r1, #7
+       ldrb    r7, [r6, r1]
+       teq     r4, #8
+       beq     Lrow8bpplp
+@
+@ Smashable regs: {r0 - r3}, [r4], {r5 - r7}, (r8 - fp), [ip], (sp), {lr}, (pc)
+@
+Lrow4bpplp:
+       ldr     r7, [lr, r7, lsl #2]
+       mul     r7, r2, r7
+       sub     r1, r1, #1                      @ avoid using r7 directly after
+       str     r7, [r0, -r5]!
+       ldrb    r7, [r6, r1]
+       ldr     r7, [lr, r7, lsl #2]
+       mul     r7, r2, r7
+       tst     r1, #7                          @ avoid using r7 directly after
+       str     r7, [r0, -r5]!
+       subne   r1, r1, #1
+       ldrneb  r7, [r6, r1]
+       bne     Lrow4bpplp
+       ldmfd   sp!, {r4 - r7, pc}
+
+@
+@ Smashable regs: {r0 - r3}, [r4], {r5 - r7}, (r8 - fp), [ip], (sp), {lr}, (pc)
+@
+Lrow8bpplp:
+       mov     ip, r7, lsr #4
+       ldr     ip, [lr, ip, lsl #2]
+       mul     r4, r2, ip
+       and     ip, r7, #15                     @ avoid r4
+       ldr     ip, [lr, ip, lsl #2]            @ avoid r4
+       mul     ip, r2, ip                      @ avoid r4
+       sub     r1, r1, #1                      @ avoid ip
+       sub     r0, r0, r5                      @ avoid ip
+       stmia   r0, {r4, ip}
+       ldrb    r7, [r6, r1]
+       mov     ip, r7, lsr #4
+       ldr     ip, [lr, ip, lsl #2]
+       mul     r4, r2, ip
+       and     ip, r7, #15                     @ avoid r4
+       ldr     ip, [lr, ip, lsl #2]            @ avoid r4
+       mul     ip, r2, ip                      @ avoid r4
+       tst     r1, #7                          @ avoid ip
+       sub     r0, r0, r5                      @ avoid ip
+       stmia   r0, {r4, ip}
+       subne   r1, r1, #1
+       ldrneb  r7, [r6, r1]
+       bne     Lrow8bpplp
+       ldmfd   sp!, {r4 - r7, pc}
+
+@
+@ Smashable regs: {r0 - r3}, [r4], {r5, r6}, [r7], (r8 - fp), [ip], (sp), [lr], (pc)
+@
+Lrow1bpp:
+       add     r6, r6, r1
+       ldmia   r6, {r4, r7}
+       strb    r4, [r0], r5
+       mov     r4, r4, lsr #8
+       strb    r4, [r0], r5
+       mov     r4, r4, lsr #8
+       strb    r4, [r0], r5
+       mov     r4, r4, lsr #8
+       strb    r4, [r0], r5
+       strb    r7, [r0], r5
+       mov     r7, r7, lsr #8
+       strb    r7, [r0], r5
+       mov     r7, r7, lsr #8
+       strb    r7, [r0], r5
+       mov     r7, r7, lsr #8
+       strb    r7, [r0], r5
+       ldmfd   sp!, {r4 - r7, pc}
+
+       .bss
+ENTRY(con_charconvtable)
+       .space  1024