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/* * linux/arch/arm/boot/compressed/head-nexuspci.S * * Copyright (C) 1996, 1997, 1998 Philip Blundell * * NexusPCI is unusual because we don't have a bootloader -- the kernel is * run directly out of ROM at the moment. Maybe this will change one day and * then this file can go away. * */ .text .globl _start _start: b reset b undefined b undefined b undefined b undefined b undefined b undefined b undefined b go_uncompress reset: mov r2, #0x20000000 @ LED off mov r1, #0x1a str r1, [r2] mov r2, #0x10000000 @ SCC init mov r1, #42 strb r1, [r2, #8] mov r1, #48 strb r1, [r2, #8] mov r1, #16 strb r1, [r2, #8] mov r1, #0x93 strb r1, [r2, #0] mov r1, #0x17 strb r1, [r2, #0] mov r1, #0xbb strb r1, [r2, #0x4] mov r1, #0x78 strb r1, [r2, #0x10] mov r1, #160 strb r1, [r2, #0x8] mov r1, #5 strb r1, [r2, #0x8] ldr r2, =_start ldr r3, =_edata mov r8, r2 mov r0, #0 1: ldmia r0!, {r4, r5, r6, r7} stmia r2!, {r4, r5, r6, r7} cmp r2, r3 ble 1b ldr r3, =_edata ldr r1, =_end mov r2, #0 1: strb r2, [r3] cmp r3, r1 beq 2f add r3, r3, #1 b 1b 2: add pc, r8, #0x20 undefined: ldr r4, =undef_msg 1: ldrb r0, [r4], #1 movs r0, r0 2: beq 2b bl _ll_write_char b 1b undef_msg: .ascii "Undefined instruction (or other problem)\000" .align 4 /* * Uncompress the kernel */ go_uncompress: mov r0, #0x40000000 ldr sp, =user_stack add sp, sp, #4096 bl decompress_kernel mov r2, #0x40000000 mov r0, #0 mov r1, #3 add pc, r2, #0x20 @ call via EXEC entry |