1174294Sobrien/*- 238494Sobrien * Copyright (c) 2007 Semihalf, Rafal Jaworowski <raj@semihalf.com> 338494Sobrien * All rights reserved. 438494Sobrien * 538494Sobrien * Redistribution and use in source and binary forms, with or without 638494Sobrien * modification, are permitted provided that the following conditions 738494Sobrien * are met: 838494Sobrien * 1. Redistributions of source code must retain the above copyright 938494Sobrien * notice, this list of conditions and the following disclaimer. 1038494Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1138494Sobrien * notice, this list of conditions and the following disclaimer in the 1238494Sobrien * documentation and/or other materials provided with the distribution. 1338494Sobrien * 1438494Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1538494Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1638494Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1738494Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1838494Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1938494Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2038494Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2138494Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2238494Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2338494Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2438494Sobrien * SUCH DAMAGE. 2538494Sobrien * 2638494Sobrien * $FreeBSD: stable/11/stand/powerpc/uboot/start.S 182726 2008-09-03 16:38:27Z raj $ 2738494Sobrien */ 2838494Sobrien 2938494Sobrien#include <machine/asm.h> 3038494Sobrien 3138494Sobrien/* 3238494Sobrien * Entry point to the loader that U-Boot passes control to. 3338494Sobrien */ 3438494Sobrien .text 3538494Sobrien .globl _start 3638494Sobrien_start: 3738494Sobrien /* Hint where to look for the API signature */ 38 lis %r11, uboot_address@ha 39 addi %r11, %r11, uboot_address@l 40 stw %r1, 0(%r11) 41 /* Save U-Boot's r14 */ 42 lis %r11, saved_regs@ha 43 addi %r11, %r11, saved_regs@l 44 stw %r14, 0(%r11) 45 /* Disable interrupts */ 46 mfmsr %r11 47 andi. %r11, %r11, ~0x8000@l 48 mtmsr %r11 49 b main 50 51/* 52 * syscall() 53 */ 54ENTRY(syscall) 55 stwu %r1, -16(%r1) 56 mflr %r0 57 stw %r14, 8(%r1) 58 stw %r0, 20(%r1) 59 /* Restore U-Boot's r14 */ 60 lis %r11, saved_regs@ha 61 addi %r11, %r11, saved_regs@l 62 lwz %r14, 0(%r11) 63 /* Enable interrupts */ 64 mfmsr %r11 65 ori %r11, %r11, 0x8000@l 66 mtmsr %r11 67 /* Call into U-Boot */ 68 lis %r11, syscall_ptr@ha 69 addi %r11, %r11, syscall_ptr@l 70 lwz %r11, 0(%r11) 71 mtctr %r11 72 bctrl 73 /* Disable interrupts */ 74 mfmsr %r11 75 andi. %r11, %r11, ~0x8000@l 76 mtmsr %r11 77 /* Epilogue */ 78 lwz %r11, 0(%r1) 79 lwz %r0, 4(%r11) 80 mtlr %r0 81 lwz %r14, 8(%r1) 82 mr %r1, %r11 83 blr 84 85/* 86 * Data section 87 */ 88 .data 89GLOBAL(syscall_ptr) 90 .long 0 91GLOBAL(saved_regs) 92 .long 0 /* R14 */ 93GLOBAL(uboot_address) 94 .long 0 95