1/* 2 * Copyright 2013, winocm. <winocm@icloud.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 11 * Redistributions in binary form must reproduce the above copyright notice, this 12 * list of conditions and the following disclaimer in the documentation and/or 13 * other materials provided with the distribution. 14 * 15 * If you are going to use this software in any form that does not involve 16 * releasing the source to this project or improving it, let me know beforehand. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29/* 30 * PE kprintf interface 31 */ 32 33#include <stdarg.h> 34#include <kern/debug.h> 35#include <kern/simple_lock.h> 36#include <mach/mach_types.h> 37#include <pexpert/pexpert.h> 38#include <pexpert/machine/protos.h> 39#include <pexpert/machine/boot.h> 40#include <machine/machine_routines.h> 41#include <machine/pal_routines.h> 42#include "semihost.h" 43 44#if DEBUG 45/* DEBUG kernel starts with true serial, but 46 * may later disable or switch to video 47 * console */ 48unsigned int disable_serial_output = FALSE; 49#else 50unsigned int disable_serial_output = TRUE; 51#endif 52 53void (*PE_kputc) (char c); 54decl_simple_lock_data(static, kprintf_lock) 55 56/** 57 * PE_init_kprintf 58 * 59 * Initialize kprintf (for semihosting right now.) 60 */ 61void PE_init_kprintf(boolean_t vm_initialized) 62{ 63 unsigned int boot_arg; 64 65 if (PE_state.initialized == FALSE) 66 panic("Platform Expert not initialized"); 67 68 if (!vm_initialized) { 69 unsigned int new_disable_serial_output = FALSE; 70 71 simple_lock_init(&kprintf_lock, 0); 72 73 if (PE_parse_boot_argn("debug", &boot_arg, sizeof(boot_arg))) 74 if (boot_arg & DB_KPRT) 75 new_disable_serial_output = FALSE; 76 77 /* 78 * If we are newly enabling serial, make sure we only 79 * * call pal_serial_init() if our previous state was 80 * * not enabled 81 */ 82 if (!new_disable_serial_output && (!disable_serial_output || pal_serial_init())) 83 PE_kputc = PE_semihost_write_char; 84 else 85 PE_kputc = cnputc; 86 87 disable_serial_output = new_disable_serial_output; 88 } 89} 90 91/** 92 * kprintf 93 * 94 * Sort of like printf, but outputs wherever PE_kputc will send it to. 95 */ 96void kprintf(const char *format, ...) 97{ 98 va_list listp; 99 100 va_start(listp, format); 101 _doprnt(format, &listp, PE_kputc, 16); 102 va_end(listp); 103} 104