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      1 /* $NetBSD: boot.c,v 1.2 2025/11/16 22:37:49 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2025 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <lib/libsa/stand.h>
     30 #include <lib/libsa/loadfile.h>
     31 
     32 #include <powerpc/include/psl.h>
     33 #include <powerpc/include/spr.h>
     34 
     35 #include <machine/pio.h>
     36 
     37 #include "cache.h"
     38 #include "console.h"
     39 #include "gpio.h"
     40 #include "miniipc.h"
     41 #include "sdmmc.h"
     42 #include "timer.h"
     43 
     44 #define PI_INTERRUPT_CAUSE	0x0c003000
     45 #define  RESET_SWITCH_STATE	__BIT(16)
     46 
     47 #define HW_BASE			0x0d800000
     48 #define HW_RESETS		(HW_BASE + 0x194)
     49 #define  RSTBINB		__BIT(0)
     50 
     51 static const char * const names[] = {
     52 	"netbsd", "netbsd.gz",
     53 	"onetbsd", "onetbsd.gz",
     54 	"netbsd.old", "onetbsd.old.gz",
     55 };
     56 #define NUMNAMES	__arraycount(names)
     57 
     58 static int	exec_netbsd(const char *);
     59 
     60 int
     61 main(void)
     62 {
     63 	extern uint8_t edata[], end[];
     64 	int curname;
     65 
     66 	memset(&edata, 0, end - edata);	/* clear BSS */
     67 
     68 	gpio_enable_int(GPIO_EJECT_BTN);
     69 	gpio_ack_int(GPIO_EJECT_BTN);
     70 
     71 	console_init();
     72 
     73 	gpio_set(GPIO_SLOT_LED);
     74 
     75 	if (!miniipc_probe()) {
     76 		panic("MINI IPC not found!");
     77 	}
     78 
     79 	sdmmc_init();
     80 
     81 	curname = gpio_get_int(GPIO_EJECT_BTN) ? 2 : 0;
     82 	gpio_disable_int(GPIO_EJECT_BTN);
     83 	gpio_ack_int(GPIO_EJECT_BTN);
     84 
     85 	for (; curname < NUMNAMES; curname++) {
     86 		printf("booting %s ", names[curname]);
     87 		exec_netbsd(names[curname]);
     88 	}
     89 
     90 	panic("No bootable kernel found");
     91 
     92 	return 0;
     93 }
     94 
     95 static int
     96 exec_netbsd(const char *fname)
     97 {
     98 	u_long marks[MARK_MAX];
     99 	void (*entry)(void);
    100 	int fd;
    101 
    102 	memset(marks, 0, sizeof(marks));
    103 	fd = loadfile(fname, marks, LOAD_KERNEL);
    104 	if (fd == -1) {
    105 		return -1;
    106 	}
    107 
    108 	gpio_clear(GPIO_SLOT_LED);
    109 
    110 	entry = (void *)marks[MARK_ENTRY];
    111 	cache_dcbf((void *)marks[MARK_START],
    112 		   marks[MARK_END] - marks[MARK_START]);
    113 	cache_icbi((void *)marks[MARK_START],
    114 		   marks[MARK_END] - marks[MARK_START]);
    115 
    116 	entry();
    117 	panic("Unexpected return from kernel");
    118 }
    119 
    120 __dead void
    121 _rtt(void)
    122 {
    123 	int led = 0;
    124 	for (;;) {
    125 		if (led) {
    126 			gpio_set(GPIO_SLOT_LED);
    127 		} else {
    128 			gpio_clear(GPIO_SLOT_LED);
    129 		}
    130 		for (int i = 0; i < 1000; i++) {
    131 			if ((in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0) {
    132 				out32(HW_RESETS, in32(HW_RESETS) & ~RSTBINB);
    133 			}
    134 			timer_udelay(1000);
    135 		}
    136 		led ^= 1;
    137 	}
    138 }
    139