ll_char_wr.rar_Table

/* * 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